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(11) | EP 4 414 618 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | AIR SUPPLY DEVICE WITH BYPASS VALVE |
| (57) An air supply device (100) for controlling air supply into a room space, comprising
means to supply fresh air from a supply air chamber 10 into a nozzle chamber 30 and
further from the nozzle chamber into the mixing chamber 20. A circulated room air
LR is induced from the room space into the mixing chamber by fresh air L1 flow from
the nozzle chamber into the mixing chamber, wherein the fresh air and the circulated
room air is mixed and diffused into the room space. Further, the air supply device
comprises bypass valve 50 for additional fresh air L2 supply from the supply air chamber
directly into the mixing chamber 20.
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TECHNICAL FIELD
BACKGROUND OF THE ART
[0002] Air supply devices are used for providing fresh air into a space and circulate the air in the space. Usually, such device comprises a supply air chamber, a mixing chamber and a heat exchanger. The flow of fresh air is brought into the supply air chamber, and it is further conducted from the supply air chamber into the mixing chamber, wherein the flow of fresh air is mixed with circulated airflow from the space, whereupon the combined airflow is conducted to the room space. The circulated airflow is conducted into the mixing chamber and the air flow is conducted through the heat exchanger, in which the circulated airflow can be heated or cooled, before discharging the mixed air flow into the room space. Using the same air supply device, the room air can be cooled in the summertime and heated in the wintertime. In the summertime, the circulated airflow of the room is cooled, and in the wintertime, it is heated in the air supply device's heat exchanger. The flow of fresh air induces the circulated airflow to flow from the room into the mixing chamber.
[0003] Sometimes, there is need to provide more supply air into the room while room air circulation is reduced, i.e. the discharged air from the air supply device may be constant. Disadvantage of the known devices is that they are not adjustable in that sense.
OBJECTIVE OF THE INVENTION
[0005] In particular, it is an objective of the present device to provide adjustable air supply device capable to control supply air and circulated room air ratio.
SUMMARY
[0006] According to a first aspect, the present invention provides an air supply device for controlling air supply into a room space, which device comprises:
- a supply air chamber,
- a mixing chamber for receiving circulated room air from the room space,
- a nozzle chamber,
- at least one first opening, through which a fresh air is conducted from the supply
air chamber to the nozzle chamber,
whereinthe nozzle chamber comprises second openings for conducting the fresh air from the nozzle chamber into the mixing chamber, and
the air supply device comprises
- at least one outlet opening, through which a combined airflow formed in the mixing chamber from the fresh airflow and the circulated room air is conducted into the room space,
- a cover panel through which the circulated room air is induced into the mixing chamber by fresh air, and
- a heat exchanger arranged inside the mixing chamber for controlling the circulated room air temperature, wherein an adjustable bypass valve is provided between the supply air chamber and the mixing chamber for conducting and adjusting additional fresh air supply directly from the supply air chamber into the mixing chamber.
[0007] The advantage of the device is that the amount of fresh supply air may be adjusted continuously while and the ratio of the fresh air and circulated room air may be controlled.
[0008] In an embodiment of the device, the air supply device comprises adjusting means for controlling fresh air supply from the supply air chamber into the nozzle chamber via the first opening(s).
[0009] In an embodiment of the device, the adjusting means comprises a sliding plate having at least one opening.
[0010] In an embodiment of the device, the adjusting means are connected to the bypass valve or controlling additional fresh air supply to the mixing chamber via the bypass valve.
[0011] In an embodiment of the device, the device comprises an adjusting device connected to the adjusting means for controlling the fresh air supply into the nozzle chamber and directly into the mixing chamber.
[0012] In an embodiment of the device, the bypass valve comprises
- a fixed tube-section having an axial central axis A, which tube-section forms an air channel between the supply air chamber and the mixing chamber,
- a movable plate arranged inside the mixing chamber, and an adjusting rod connected to the movable plate, wherein the adjusting rod is configured to move linearly inside the tube-section for moving the movable plate between open position and closed position, wherein
- in closed position, the movable plate is blocking the additional fresh air supply from the supply air chamber into the mixing chamber via the air channel, and
- in open position, the movable plate is allowing the additional fresh air supply from the supply air chamber into the mixing chamber via the air channel.
[0014] In an embodiment of the device, the adjusting device connected to the adjusting means, and is configured to provide linear motion for moving the sliding plate between open position and closed position, wherein
- in open position, the opening(s) of the sliding plate is aligned with the first opening(s), for allowing fresh air flow from the supply air chamber into the nozzle chamber,
- in closed position, the opening(s) of the sliding plate is unaligned with the first opening(s), wherein the sliding plate blocks the fresh air flow from the supply air chamber into the nozzle chamber.
[0015] In an embodiment of the device, the adjusting device is configured to provide linear motion, and the adjusting device is connected to the bypass valve for providing linear motion to the rod and the movable plate connected to the rod for opening and closing the bypass valve.
[0016] In an embodiment of the device, the adjusting means comprises movement mechanism arranged inside the supply air chamber and between the adjusting device and at least one of the sliding plate and bypass valve for transmitting the linear movement, provided by the adjusting device, to the sliding plate and/or the bypass valve.
[0017] In an embodiment of the device, the movement mechanism is fastened to the sliding plate of the adjusting means.
[0018] In an embodiment of the device, the movement mechanism comprises
- two wall plates on opposite sides of the bypass valve, which wall plates are arranged parallel to each other and perpendicular to the sliding plate, wherein each wall plate comprises an elongated opening having straight section, being parallel to the sliding plate, and a slanting section, being slanted towards the sliding plate, and
- a bar arranged to extend through the elongated openings, wherein the bar is connected to the rod of the bypass valve.
[0019] In an embodiment of the device, the adjusting device is connected to the movement mechanism, whereby
- the linear motion, provided by the adjusting device, is transmitted to the movement mechanism and to the sliding plate, in which the movement mechanism is fastened, for adjusting the fresh air supply from the supply air chamber into the nozzle chamber,
- the bar is fastened to the rod of the bypass valve and the movement mechanism is configured to move in relation to the bar,
- the bar is extended through the elongated openings of the movement mechanism's walls, wherein the bypass valve is configured to be in closed position, when the bar is at the straight sections of the elongated openings, and in open position when the bar is at the slanting sections of the elongated openings.
[0020] In an embodiment of the device, the linear motion, provided by the adjusting device, is configured to first open the fresh air supply into the nozzle chamber and then the additional fresh air supply into the mixing chamber via the bypass valve.
[0022] It is to be understood that the aspects and embodiments of the invention described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this specification, illustrate embodiments of the invention and together with the description help to explain the principles of the invention. In the drawings:
Figs. 1a and 1b show an embodiment of an air supply device having one side air diffusion,
Figs. 2a and 2b show an embodiment of an air supply device having two side air diffusion,
Figs. 3a, 3b and 3c show the air supply device in different supply air modes,
Fig. 4 shows an example of a bypass valve,
Fig. 5 shows a side wall of a movement mechanism,
Figs. 6a, 6b and 6c show the air supply device in different supply air modes, wherein the adjustment is provided with a movement mechanism,
Figs. 7a and 7b show three-dimension view of adjustment device and adjustment means, and
Figs. 8a and 8b show an elongated air supply device having multiple bypass valves
DETAILED DESCRIPTION
[0024] An air supply device is an apparatus capable to supply fresh air into a space, such as a room, to circulate the air in the space, and to treat, e.g. heat or cool, the air before diffused into the room. Further, the air supply device is capable to control the air supply, i.e. the ratio of the fresh air and the circulated room air diffused into the room space.
[0025] In figures, air flows are illustrated as dashed arrows. Fresh supply air is referred with L1/L2, recirculated room air with LR, and mixed air with LA.
[0026] An air supply device 100 comprises a supply air chamber 10 for receiving fresh air from outside of the device, e.g. from outdoors, a mixing chamber 20 for receiving circulated room air LR from the room space, and a nozzle chamber 30. The fresh air is conducted from the supply air chamber into the nozzle chamber through at least one first opening. The nozzle chamber 30 comprises second openings for conducting the fresh air L1 from the nozzle chamber 30 into the mixing chamber 20. The air supply device comprises at least one outlet opening for diffusing a combined air flow, formed in the mixing chamber from the fresh air L1 and circulated room air LR, into the room space. The air supply device comprises a cover panel through which the circulated room air LR is induced into the mixing chamber by the fresh air flow L1, and a heat exchanger, which is arranged inside the mixing chamber for controlling the circulated room air temperature. The air supply device comprises an adjustable bypass valve which is provided between the supply air chamber and the mixing chamber for conducting and adjusting additional fresh air L2 supply directly from the supply air chamber 10 into the mixing chamber 20.
[0027] Figs. 1a and 1b show an air supply device having one side air diffusion, i.e. air is diffused to one side of the device. The air supply device comprises a supply air chamber 10, mixing chamber 20 and a nozzle chamber 30 arranged between the supply air chamber and the mixing chamber. The supply air chamber and the nozzle chamber are connected to each other via first opening 60, through which the fresh air L1 is be conducted from the supply air chamber into the nozzle chamber. Although the figures show only one first opening 60, there may be several first openings. The nozzle chamber 30 and the mixing chamber are connected to each other via second opening 31, through which the fresh air L1 is conducted from the nozzle chamber 30 into the mixing chamber 20. Although the figures show only one second opening 31, there may be several second openings. The room air LR is introduced into the mixing chamber 20 through a cover panel 21 and further through a heat exchanger 23, which is arranged next to the cover panel. Optionally, the heat exchanger is positioned in different location so that it is still capable to condition the circulated room air before it is mixed with the fresh air L1 inside the mixing chamber 20. The air supply device comprises a bypass valve 50, which is in closed position in figure 1a and in open position in figure 1b. In closed position, as shown in figure 1a, the bypass valve blocks additional fresh air L2 supply into the mixing chamber 20. In open position, as shown in figure 1b, the bypass valve allows additional fresh air L2 supply into the mixing chamber 20 via the bypass valve. The mixed air, i.e. fresh air and circulated room air, is diffused to the room space via outlet opening 25. Optionally, two or more outlet openings are provided.
[0028] The bypass valve may be adjusted so that the additional fresh air L2 supply is so high that the circulated room air LR is blocked from entering the air supply device. Thus, the air supply device diffuses only fresh air into the room space. By adjusting the bypass valve 50, it is possible to control the fresh air and circulated room air ratio entering the mixing chamber.
[0029] Figs. 2a and 2b show an embodiment of an air supply device having two side air diffusion, i.e. the air is diffused to two sides of the device. The air supply device comprises a supply air chamber 10, mixing chamber 20 and a nozzle chamber 30 arranged between the supply air chamber and the mixing chamber. The supply air chamber and the nozzle chamber are connected to each other via first openings 60a, 60b, through which the fresh air L1 is conducted from the supply air chamber into the nozzle chamber. Although the figures show two first openings 60a, 60b, there may be only one first opening or several first openings. The nozzle chamber 30 and the mixing chamber are connected to each other via second openings 31a 31b, through which the fresh air L1 is conducted from the nozzle chamber 30 into the mixing chamber 20. Although the figures show two second opening 31a, 31b, there may be only one or several second openings. The room air LR is introduced into the mixing chamber 20 through a cover panel 21 and further through a heat exchanger 23, which is arranged next to the cover panel. Optionally, the heat exchanger is positioned in different location so that it is still capable to condition the circulated room air before it is mixed with the fresh air L1 inside the mixing chamber 20. The air supply device comprises a bypass valve 50, which is in closed position in figure 2a and in open position in figure 2b. In closed position, as shown in figure 2a, the bypass valve blocks additional fresh air L2 supply into the mixing chamber 20. In open position, as shown in figure 2b, the bypass valve allows additional fresh air L2 supply into the mixing chamber 20 via the bypass valve. The mixed air, i.e. fresh air and circulated room air, is diffused to the room space via outlet openings 25a, 25b. Optionally, three or more outlet openings are provided.
[0030] Figs. 3a, 3b and 3c show the air supply device in different supply air modes, in closed mode, mid-mode, and fully open mode. In closed mode, no fresh air is supplied into the mixing chamber 20 and, thus, no circulated room air is induced into the mixing chamber. In mid-mode, fresh air L1 is supplied into the mixing chamber via nozzle chamber, and the fresh air L1 flow induces circulated room air into the mixing chamber 20. In fully open mode, in addition to the mid-mode, the bypass valve 50 is opened and additional fresh air L2 is supplied into the mixing chamber 20. Depending on the volume of the additional fresh air L1 supply, circulated room air may be induced into the mixing chamber or not. Different modes may be selected by adjusting means. In figures 3a, 3b and 3c, the adjusting means comprises a sliding plate 70. The sliding plate 70 comprises openings 61a, 61b and their position may be changed by sliding the sliding plate 70.
[0031] In figure 3a, the sliding plate 70 is in position, where the openings 61a, 61b are unaligned. Therefore, the sliding plate 70 blocks the first openings 31a, 31b and the fresh air L1 may not be conducted to the nozzle chamber 30 and further into the mixing chamber 20.
[0032] In figure 3b, the sliding plate 70 is in position, where the openings 61a, 61b are aligned with the first openings 31a, 31b, and the fresh air L1 may be supplied into the nozzle chamber 30 and further into the mixing chamber 20. The fresh air L1 flow into the mixing chamber induces circulated room air into the mixing chamber 20, and the mixed air flow is diffused into the room space via outlet openings 25a, 25b.
[0033] In figure 3c, the sliding plate 70 is in position, where the openings 61a, 61b are aligned with the first openings 31a, 31b, and the fresh air L1 may be supplied into the nozzle chamber 30 and further into the mixing chamber 20. Also, the bypass valve is open and the additional fresh air L2 is supplied into the mixing chamber. The fresh air L1 flow into the mixing chamber induces circulated room air into the mixing chamber 20, and the mixed air flow is diffused into the room space via outlet openings 25a, 25b.
[0034] Fig. 4 shows an example of a bypass valve 50 comprising a tube-section 51 having a central axis A; a movable plate 52, arranged inside the mixing chamber; and an adjusting rod 53, arranged to move inside the air channel 54. The tube-section 51 comprises a first end and a second end so that the first end opens into the supply air chamber and the second end opens into the mixing chamber so that an air channel 54 formed between the supply air chamber and the mixing chamber for supplying additional fresh air from the supply air chamber into the mixing chamber. The tube-section 51 is arranged to be fixed to the air supply device and to isolate the air channel 54 from any unwanted air leakages into the air channel or from the air channel. The tube-section 54 defines the length of the bypass valve 50 and depending on the length, the bypass valve may be fastened to structures having different thicknesses. Optionally, the bypass valve is fastened to the air supply device so that the tube-section extends through an air chamber, e.g. the nozzle chamber. The tube-section may be cylindrical, or the cross-section of the tube-section may be round or rectangular.
[0035] The movable plate 52 is a plate-like structure and arranged to move between closed position and open position. In closed position, the movable plate 52 is in position that it blocks the additional fresh air L2 supply through the bypass valve 50. For example, the bypass valve may be fastened to the air supply device so that the movable plate 52 may engage with a wall through which the bypass valve is fastened, i.e. the tube-section is fastened to the wall and the movable plate 52 may be retracted to the closed position, whereby an outer rim section (a section extending from the outer edge of the movable plate) is against the wall. Optionally, in closed position the movable plate is engaged with the tube-section 51 for blocking the additional fresh air L2 supply via the bypass valve 50 into the mixing chamber. In open position, the movable plate is arranged to be at a distance to the wall, in which the bypass valve is fastened. E.g. the movable plate may be moved away from the closed position, whereby a gap is formed between the movable plate and the wall, and the additional fresh air L2 may be supplied to the mixing chamber through the gap. The wall may be for example a wall of some air chamber, e.g. a nozzle chamber. Optionally, the bypass valve 50 is fastened through the nozzle chamber 20, and the movable plate, e.g. the outer rim section, is against the nozzle chamber wall in closed position.
[0036] The adjusting rod 53 is an elongated part which is connected to the movable plate 52. The rod 53 is configured to move linearly, i.e. along its axial axis, inside the tube-section 51, i.e. in relation to the fixed tube-section. As the rod is connected to the movable plate, the movement of the rod causes the movement of the movable plate between the open position and closed position. The length of the rod is greater than the length of the tube-section so that one end of the rod is inside the supply air chamber and the other end is fastened to the movable plate. The rod may be positioned coaxially with the central axis A of the tube-section 51. The movable plate 52 may be perpendicular to the rod 53.
[0037] Fig. 5 shows a side wall of a movement mechanism, which is part of the adjusting means adjusting the bypass valve and sliding plate position. The side wall 71 comprises an elongated opening 72, comprising a straight section 72a and a slanted section 72b. The side wall is arranged to be fastened to the sliding plate so that the side wall is perpendicular to the sliding plate. The straight section 72a is parallel to the sliding plate and the slanting section 72b is slanted from the straight section towards the sliding plate. The movement mechanism comprises two side walls, which are arranged parallel to each other and on opposite sides of the bypass valve. The movement mechanism comprises a bar 73, which is arranged in functional connection with the elongated openings of the two side walls. The bar 73 is extending through the elongated openings so that the side walls 71 may move in relation to the bar 73, while the elongated openings 72 restricts the movement. While the bar 73 is at the straight sections 72a of the elongated openings, the distance from the bar to the sliding plate, in which the side walls are fastened, does not change. When the bar is at the slanting sections 72b of the elongated openings and moves from the straight section towards the end of the slanting section, the distance from the bar to the sliding plate decreases. In figure 4, the end of the bar 73 is shown as a circle, and two possible locations for the bar is shown as dotted circles. The middle circle represents the position, where the side walls have moved a certain distance and the distance from the bar to the sliding plate has not changed. When the side walls 71 are moved further, to left in figure 4, the bar moves towards the position where the right dotted circle is shown, and the distance from the bar to the sliding plate decreases while the side walls are moved.
[0038] Figs. 6a, 6b and 6c show the air supply device in different supply air modes, wherein the adjustment is provided with adjusting means comprising a sliding plate 70 and a movement mechanism fastened to the sliding plate. The movement mechanism comprises side walls 71 having elongated openings 72, and a bar 73 arranged in functional connection with the elongated openings. In figure 6a, the air supply device is in closed mode, in figure 6b, the air supply device is in mid-mode, and in figure 6c, the air supply device is in fully open mode. When adjusting the air supply device between different modes, the sliding plate, and the movement mechanism fastened to it moves simultaneously. The bar 73 of the movement mechanism is connected to the adjusting rod 53 of the bypass valve.
[0039] In closed mode, as shown in figure 6a, the openings 61a, 61b in the sliding plate 70 are unaligned with the first openings 60a, 60b so that the fresh air L1 supply from the supply air chamber into the nozzle chamber is blocked. The bar 73 is at the end of the straight sections of the elongated openings 72, and the rod 53, connected to the bar, is in uppermost position. The movable plate 52, which is fastened to the other end of the rod 53 is in closed position (described earlier) and blocking the additional fresh air L2 supply into the mixing chamber.
[0040] In the mid-mode, as shown in figure 6b, the sliding plate 70 and the movement mechanism have been moved, to the left in figure 6b, and the openings 61a, 61b in the sliding plate 70 are aligned with the first openings 60a, 60b so that the fresh air L1 supply from the supply air chamber into the nozzle chamber is allowed. The bar 73 is still at the straight sections of the elongated openings 72, and the rod 53, connected to the bar, is still in the uppermost position. The movable plate 52, which is fastened to the other end of the rod 53 is in closed position (described earlier) and blocking the additional fresh air L2 supply into the mixing chamber.
[0041] In the fully open mode, as shown in figure 6c, the sliding plate 70 and the movement mechanism have been moved further, to the left in figure 6c, and the openings 61a, 61b in the sliding plate 70 are still aligned with the first openings 60a, 60b so that the fresh air L1 supply from the supply air chamber into the nozzle chamber is allowed. The bar 73 is at the end of the slanting sections of the elongated opening 72, and the rod 53, connected to the bar, is in lowermost position. The movable plate 52, which is fastened to the other end of the rod 53 is in open position (described earlier) and allowing the additional fresh air L2 supply into the mixing chamber through the bypass valve.
[0042] Although here is described three different modes, closed mode, mid-mode and fully open mode, for adjusting the fresh air, it should be understood that the adjustment of each fresh air L1, L2 flow may be stepless. The air supply device may be adjusted between said modes and the fresh air flows L1 and L2 may be adjusted by adjusting the position of the sliding plate and the bypass valve. The fresh air L1 flow from the supply air chamber 10 into the nozzle chamber 30 may be adjusted by moving the sliding plate 70 of the adjusting means, i.e. the amount of fresh air L1 conducted from the supply air chamber 10 into the nozzle chamber 30 depends on the position of the sliding plate 70. Max amount is supplied when the openings on the sliding plate and the first openings between the supply air chamber and the nozzle chamber are completely aligned. When the openings on the sliding plate and the first openings between the supply air chamber and the nozzle chamber are completely unaligned, the fresh air L1 flow from the supply air chamber into the nozzle chamber is completely blocked, i.e. the amount is zero. The amount of fresh air L1 supply from the supply air chamber into the nozzle chamber may be adjusted between max and zero by moving the sliding plate. The additional fresh air L2 flow may be adjusted by moving the adjustment means when the bar 73 is at the slanting section, whereby the rod moves in perpendicular direction to the sliding plate, and the movable plate 52 moves allowing different amount, depending on the position of the bar at the slanting section, of additional fresh air L2 to flow into the mixing chamber. The fresh air L1, L2 supply may be adjusted so that the fresh air L1 supply into the nozzle chamber is first adjusted to max, by moving the sliding plate, and then the bypass valve is opened and the amount of additional fresh air L2 into mixing chamber is adjusted by continuing the movement of the sliding plate (and the movement mechanism fastened to the sliding plate).
[0043] The movement of the adjusting means may be provided with an adjusting device. The adjusting device may be for example linear actuator capable to provide linear movement. The adjusting device and the adjusting means are connected to each other so that the linear motion, provided by the adjusting device, is transferred to the adjusting means. The adjusting device and the adjusting means may be connected to each other for example mechanically with a rod or bar etc. The adjusting device may be connected to the movement mechanism of the adjusting device, e.g. to a plate provide between the side walls of the movement mechanism.
[0044] The air supply device may comprise stopper means arranged inside the supply air chamber. The stopper means are arranged to prevent or restrict the movement of the bar of the movement mechanism is moved. The stopper means may be for example plates arranged next to side walls so that the bar, which is extended through the elongated openings in the side walls, engages with the plates for preventing or restricting the movement.
[0045] Fig. 7a and 7b show three-dimension view of an embodiment of the adjustment device and adjustment means. Figure 7a shows the adjustment means from above, i.e. what are inside the supply air chamber, and figure 7b shows the same components below. The adjustment device 80 is fixed to the wall, e.g. bottom wall, of the supply air chamber and it is connected to the movement mechanism 90 via connection bar 81. The adjusting device provides linear motion, which is transferred to the movement mechanism by the connection bar 81. The movement mechanism 90 is fastened to the sliding plate 70 so that the sliding plate moves simultaneously with the movement mechanism, and the fresh air supply from the supply air chamber into the nozzle chamber may be adjusted. The movement mechanism comprises two side walls 71, arranged on opposite sides of the bypass valve, which are perpendicular to the sliding plate 70. The movement mechanism comprises a bar 73, which is extending through the elongated openings 72 in the side walls 71. The adjusting rod 53 is fastened to the bar 73 for providing linear motion to the rod 53 when the movement mechanism is moved so that the bar is at the slanting sections. When the bar 73 is moved at the slanting sections, the distance between the bar and the sliding plate varies and the rod 53 moves simultaneously with the bar 73. With the mechanism, the linear motion provided by the adjusting device 80 may be transferred to perpendicular linear movement of the rod. With the perpendicular linear motion, the position of the movable plate, may be adjusted between open and closed position (described earlier). Figures 7a and 7b shows an embodiment, wherein the nozzle chamber is arranged between the supply air chamber and the mixing chamber. However, for clarity, the walls of the nozzle chamber, supply air chamber and the mixing chamber are not shown. Only a wall between the supply air chamber and the nozzle chamber is shown, as the sliding plate is arranged adjacent to said wall and the first openings between the supply air chamber and the nozzle chamber are provided in that wall. The nozzle chamber would be arranged so that the tube-section 51 would be surrounded by the nozzle chamber, and the movable plate 52 would be inside the mixing chamber.
[0046] Figs. 8a and 8b show an elongated air supply device having multiple bypass valves. The air supply device may have different shapes. For larger spaces, it may be advantageous to provide an elongated air supply device for providing more efficient air supply. The elongated air supply device may comprise the same features as described earlier. However, the elongated air supply device may comprise two or more bypass valves 50a, 50b, 50c,... for providing and adjusting additional fresh air L2 from the supply air chamber 10 into the mixing chamber 20. The elongated air supply device may have one common nozzle chamber 30 or several separate nozzle chambers 30a, 30b, 30c, 30d,..., and the fresh air L1 from the supply air chamber 10 is conducted to the nozzle chamber or nozzle chambers and further to the mixing chamber 20. All the bypass valves 50a, 50b, 50c,... may be adjusted with the similar adjustment means and adjusting device as described earlier.
[0047] It should be noted that many of the features described herein in connection with certain figure can be implemented also to other embodiments.
[0048] The first openings may have any shape, e.g. round, rectangular, or an elongated gap. Optionally, there may be several openings.
[0049] The second openings may have any shape, e.g. round, rectangular, or they may be elongated gaps.
[0050] In figures, the nozzle chamber 30 is arranged between the supply air chamber and the mixing chamber, but it may be positioned otherwise.
[0051] The cover panel may have one opening or several openings, or the cover panel may be perforated.
[0052] Although the invention has been the described in conjunction with a certain type of device, it should be understood that the invention is not limited to any certain type of device. While the present inventions have been described in connection with a number of exemplary embodiments, and implementations, the present inventions are not so limited, but rather cover various modifications, and equivalent arrangements, which fall within the purview of prospective claims.
1. An air supply device (100) for controlling air supply into a room space, which device
comprises:
- a supply air chamber (10),
- a mixing chamber (20) for receiving circulated room air (LR) from the room space,
- a nozzle chamber (30),
- at least one first opening (60, 60a, 60b,...), through which a fresh air (L1) is
conducted from the supply air chamber (10) to the nozzle chamber (30),
wherein
the nozzle chamber (30) comprises second openings (31a, 31b) for conducting the fresh
air (L1) from the nozzle chamber (30) into the mixing chamber (20), and the air supply
device comprises
- at least one outlet opening (25, 25a, 25b,...), through which a combined airflow (LA) formed in the mixing chamber (20) from the fresh airflow (L1) and the circulated room air (LR) is conducted into the room space,
- a cover panel (21) through which the circulated room air (LR) is induced into the mixing chamber (20) by fresh air (L1), and
- a heat exchanger (23) arranged inside the mixing chamber for controlling the circulated
room air temperature,
ch ar ac ter i zed in that
an adjustable bypass valve (50) is provided between the supply air chamber (10) and
the mixing chamber (20) for conducting and adjusting additional fresh air (L2) supply
directly from the supply air chamber (10) into the mixing chamber (20).
2. The air supply device according to claim 1, wherein the air supply device comprises
adjusting means for controlling fresh air supply from the supply air chamber into
the nozzle chamber via the first opening(s).
3. The air supply device according to claim 2, wherein the adjusting means comprises
a sliding plate (70) having at least one opening (61, 61a, 61b,...).
4. The air supply device according to claim 2 or 3, wherein the adjusting means are connected
to the bypass valve (50) for controlling additional fresh air (L2) supply to the mixing
chamber (20) via the bypass valve.
5. The air supply device according to claim 4, comprising an adjusting device (80) connected
to the adjusting means for controlling the fresh air supply into the nozzle chamber
and directly into the mixing chamber.
6. The air supply device according to any one of preceding claims, wherein the bypass
valve (50) comprises
- a fixed tube-section (51) having an axial central axis A, which tube-section forms an air channel (54) between the supply air chamber (10) and the mixing chamber (20),
- a movable plate (52) arranged inside the mixing chamber (20), and an adjusting rod (53) connected to the movable plate, wherein the adjusting rod is configured to move linearly inside the tube-section for moving the movable plate between open position and closed position, wherein
- in closed position, the movable plate is blocking the additional fresh air (L2) supply from the supply air chamber (10) into the mixing chamber (20) via the air channel (54), and
- in open position, the movable plate is allowing the additional fresh air (L2) supply from the supply air chamber (10) into the mixing chamber (20) via the air channel (54).
7. The air supply device according to claim 6, wherein the tube-section (51) is extending
through the nozzle chamber (30).
8. The air supply device according any one of claims 5 to 7 when dependent on claim 3,
wherein the adjusting device (80) connected to the adjusting means, and is configured
to provide linear motion for moving the sliding plate (70) between open position and
closed position, wherein
- in open position, the opening(s) (61, 61a, 61b,...) of the sliding plate is aligned with the first opening(s) (60, 60a, 60b), for allowing fresh air (L1) flow from the supply air chamber (10) into the nozzle chamber (30),
- in closed position, the opening(s) (61, 61a, 61b,...) of the sliding plate (70) is unaligned with the first opening(s) (60, 60a, 60b,...), wherein the sliding plate blocks the fresh air (L1) flow from the supply air chamber (10) into the nozzle chamber (30).
9. The air supply device according to claim 5 or any one of claims 6 to 8 when dependent
on claim 5, wherein the adjusting device (80) is configured to provide linear motion,
and the adjusting device is connected to the bypass valve (50) for providing linear
motion to the rod (53) and the movable plate (52) connected to the rod for opening
and closing the bypass valve.
10. The air supply device according to claim 5 or any one of claims 6 to 8 when dependent
on claim 5, wherein the adjusting means comprises movement mechanism arranged inside
the supply air chamber (10) and between the adjusting device (80) and at least one
of the sliding plate (70) and bypass valve (50) for transmitting the linear movement,
provided by the adjusting device, to the sliding plate and/or the bypass valve.
11. The air supply device according to claim 10, wherein the movement mechanism is fastened
to the sliding plate (50) of the adjusting means.
12. The air supply device according to claim 11, wherein the movement mechanism comprises
- two wall plates (71) on opposite sides of the bypass valve (50), which wall plates are arranged parallel to each other and perpendicular to the sliding plate (70), wherein each wall plate comprises an elongated opening (72) having straight section (72a), being parallel to the sliding plate, and a slanting section (72b), being slanted towards the sliding plate, and
- a bar (73) arranged to extend through the elongated openings (72), wherein the bar is connected to the rod (73) of the bypass valve.
13. The air supply device according to claim 12, wherein the adjusting device (80) is
connected to the movement mechanism, whereby
- the linear motion, provided by the adjusting device, is transmitted to the movement mechanism and to the sliding plate (70), in which the movement mechanism is fastened, for adjusting the fresh air (L1) supply from the supply air chamber (10) into the nozzle chamber (30),
- the bar (73) is fastened to the rod (53) of the bypass valve and the movement mechanism is configured to move in relation to the bar,
- the bar is extended through the elongated openings (72) of the movement mechanism's walls (71), wherein the bypass valve is configured to be in closed position, when the bar is at the straight sections (72a) of the elongated openings, and in open position when the bar is at the slanting sections (72b) of the elongated openings.
14. The air supply device according to claim 13, wherein the linear motion, provided by
the adjusting device, is configured to first open the fresh air (L1) supply into the
nozzle chamber and then the additional fresh air (L2) supply into the mixing chamber
(20) via the bypass valve.
15. The air supply device according to any one of the preceding claims, comprising two
or more bypass valves (50a, 50b,...).