(19)
(11)EP 4 071 423 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
12.10.2022 Bulletin 2022/41

(21)Application number: 22166463.4

(22)Date of filing:  04.04.2022
(51)International Patent Classification (IPC): 
F24F 13/14(2006.01)
F16K 17/36(2006.01)
A62C 2/14(2006.01)
F16K 1/16(2006.01)
F24F 13/15(2006.01)
(52)Cooperative Patent Classification (CPC):
F24F 13/1426; F24F 13/15; F24F 2013/146; F24F 2013/1473; A62C 2/14
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 07.04.2021 FI 20215413

(71)Applicant: VG Innovations S.à r.l.
2146 Luxembourg (LU)

(72)Inventors:
  • Niemi, Timo
    00880 Helsinki (FI)
  • Lahtinen, Osmo
    00880 Helsinki (FI)

(74)Representative: Boco IP Oy Ab 
Kansakoulukatu 3
00100 Helsinki
00100 Helsinki (FI)

  


(54)BLAST DAMPER


(57) Presented is a blast damper (1) comprising a frame (2) defining a flow channel (3) and closing blades (4) in the flow channel (3). The blast damper comprises an actuating mechanism (6) comprising turning levers (7) so that one turning lever (7) is fixed to shaft means (5) of each closing blade (4) and a common operating lever (8) is configured to simultaneously pivot the closing blades (4) between a closed position and so that the actuating mechanism (6) takes a closing position, and an open position and so that the actuating mechanism (6) takes an opening position. The blast damper comprises an energy storing device (9) that is functionally connected to the actuating mechanism (6) and that is configured to be loaded with energy when the closing blades (4) pivots into the closed position. The blast damper (1) comprises an adjustable stopper mechanism (10) for setting the opening position.




Description

Field of the invention



[0001] The invention relates to a blast damper as defined in the preamble of independent claim 1.

[0002] In petrochemical plants, oil-drilling rigs, process industry plants and other corresponding plants, it is necessary to safeguard against sudden and high pressure loads caused by explosions, sudden fires, or the like. Ventilation systems are safeguarded against such pressure loads by installing in them pressure valves or blast dampers that close automatically when a pressure load of the above-mentioned type is directed to them. Pressure valves of this type may also be installed at a desired location in a ventilation shaft or directly inside or outside a pressure load-resistant wall in connection with a ventilation shaft. Prior art pressure valves comprise plate-like closing blades arranged on turning axles. Normally, there are two or more axles in a pressure valve and they extend parallel at a distance from each other across a flow channel formed by the pressure valve, through which air or some other flowing medium flows through the pressure valve. One or more closing blades may be installed next to each other on one axle. In a normal operating mode, the closing blades are in an open position that allows air or some other flowing medium to flow through the closing blades and the pressure valve. Thus, in the open position, the closing blades are set in the flow direction of the air flowing through the pressure valve or at an angle relative to the flow direction.

[0003] Publication US 5,425,673 presents a fire closure shutter.

Objective of the invention



[0004] The object of the invention is to provide a blast damper having closing blades capable of automatically move into a closed position in response to a pressure increase sensed by at least one of the closing blades and capable of automatically move into an open position so that the open position can be selected to achieve a selected flow of air through a flow channel of the blast damper.

Short description of the invention



[0005] The blast damper of the invention is characterized by the definitions of independent claim 1.

[0006] Some embodiments of the blast damper are presented in the dependent claims.

List of figures



[0007] In the following the invention will described in more detail by referring to the figures of which

Figure 1 shows an embodiment of the blast damper in a state where the closing blades are in an open position and where the actuating mechanism is in an opening position,

Figure 2 shows in section view the embodiment of the blast damper shown in figure 1 in a state where the closing blades are in an open position,

Figure 3 shows the embodiment of the blast damper in a state where the closing blades are in a closed position and where the actuating mechanism is in a closing position, and

Figure 4 shows in section view the embodiment of the blast damper shown in figure 1 in a state where the closing blades are in a closed position.


Detailed description of the invention



[0008] Next the blast damper 1 and some embodiments and variants of the blast damper 1 will be described in greater detail.

[0009] The blast damper 1 comprises a frame 2 defining a flow channel 3 for air flow through the blast damper 1.

[0010] The blast damper 1 comprises closing blades 4 pivotally arranged in the flow channel 3, wherein each closing blade 4 can be pivoted about a pivot axis (not marked with a reference numeral) between a closed position and an open position and wherein each closing blade 4 is pivotally supported at the frame 2 by means of shaft means 5. The pivot axes of the closing blades 4 are preferably, but not necessarily, essentially parallel.

[0011] The blast damper 1 comprises an actuating mechanism 6 comprising turning levers 7. One turning lever 7 is fixed to the shaft means 5 of each closing blade 4 and a common operating lever 8 is turnably fixed to each turning lever 7 such that the closing blades 4 are configured to simultaneously pivot between the closed position so as to prevent air flow through the blast damper 1 and so that the actuating mechanism 6 takes a closing position in the closed position of the closing blades 4, and the open position so as to allow air flow through the blast damper 1 and so that the actuating mechanism 6 takes an opening position in the open position of the closing blades 4.

[0012] The blast damper 1 comprises an energy storing device 9 functionally connected to the actuating mechanism 6.

[0013] The closing blades 4 are configured to pivot into the closed position in response to a pressure increase in the flow channel 3 sensed by at least one of the closing blades 4. The closing blades 4 are preferably, but not necessarily, configured to pivot into the closed position in response to a pressure increase exceeding a threshold value in the flow channel 3 sensed by at least one of the closing blades 4.

[0014] The energy storing device 9 is configured to be loaded with energy when the closing blades 4 pivots into the closed position, wherein said energy loaded to the energy storing device 9 is configured urge the closing blades 4 into the open position from the closed position. The blast damper 1 functions in this way automatically, which means that there is no need to for example manually move the closing blades 4 to the open position or to provide the blast damper 1 for example with a remotely operated triggering device (not illustrated in the figures) for moving the closing blades 4 to the open position. This makes the blast damper 1 easy to use and makes it technically simple.

[0015] The blast damper 1 comprises an adjustable stopper mechanism 10 functionally connected to the actuating mechanism 6 for setting the opening position of the actuating mechanism 6. Because the adjustable stopper mechanism 10 is functionally connected to the actuating mechanism 6 it is in this way possible to adjust the angle the closing blades 4 takes in the flow channel 3 in the opening position of the actuating mechanism 6 and consequently possible to adjust the air flow through the flow channel 3 in the opening position of the actuating mechanism 6.

[0016] The adjustable stopper mechanism 10 is preferably, but not necessarily, functionally connected to the actuating mechanism 6 by being configured to abut a first movement limiter 16 of the adjustable stopper mechanism 10 in the opening position of the actuating mechanism 6. When the closing blades 4 pivots from the open position to the closed position and the actuating mechanism 6 correspondingly moves from the opening position to the closing position, the actuating mechanism 6 is configured to move apart from the first movement limiter 16 of the adjustable stopper mechanism 10.

[0017] The adjustable stopper mechanism 10 comprises preferably, but not necessarily, as illustrated in the figures, an elongated opening 12 and a pin member 11 that is configured to move in the elongated opening 12. In such case, the first movement limiter 16 of the adjustable stopper mechanism 10 is formed by a first end 13 of the elongated opening 12 and the pin member 11 is configured to abut the first end 13 of the elongated opening 12 in the opening position of the actuating mechanism 6. In such case the pin member 11 of the adjustable stopper mechanism 10 is configured to move in a direction towards a second end 14 of the elongated opening 12 of the adjustable stopper mechanism 10 when the closing blades 4 pivots to the open position. In such case, the pin member 11 and/or the elongated opening 12 is adjustable arranged with respect to the frame 2 so as to enable to set the opening position of the actuating mechanism 6. In such case, the pin member 11 and/or the elongated opening 12 is more preferably adjustable attached with respect to the frame 2 so as to enable to set the opening position of the actuating mechanism 6.In other words, by adjusting the position of at least one of the pin member 11 and the elongated opening 12, it is possible to adjust the position where the pin member 11 abuts the first end 13 of the elongated opening 12 and to adjust the angle the closing blades 4 takes in the flow channel 3 in the opening position of the actuating mechanism 6. The pin member 11 of the adjustable stopper mechanism 10 is preferably, but not necessarily, configured to be spaced apart from the second end 14 of the elongated opening 12 in the closing position of the actuating mechanism 6. This to ensure compete closing of the flow channel 3 by means of the closing blades 4 by preventing that the pin member 11 abuts the second end 14 of the elongated opening 12 before the closing blades 4 simultaneously pivots to the closed position and closes and prevents air flow through the blast damper 1.

[0018] If the adjustable stopper mechanism 10 comprises an elongated opening 12 and a pin member 11, the actuating mechanism 6 is preferably, but not necessarily, provided with the pin member 11 of the adjustable stopper mechanism 10 and the elongated opening 12 of the stopper mechanism 10 is preferably, but not necessarily, provided in an adjustable stopper member 15 that is adjustable provided at the blast damper 1. In such case one of the turning levers 7 of the actuating mechanism 6 is preferably, but not necessarily, as illustrated in the figures, provided with the pin member 11 of the adjustable stopper mechanism 10. In such case, the adjustable stopper member 15 is preferably, but not necessarily, as illustrated in the figures, adjustable attached to the frame 2.

[0019] The energy storing device 9 is preferably, but not necessarily, a spring 17 that is functionally connected between the frame 2 and the actuating mechanism 6. The spring 17 is preferably, but not necessarily, a tension spring that is configured to be loaded with energy i.e. to extend when the closing blades 4 pivots from the open position into the closed position. Other spring types can also be used.

[0020] If the energy storing device 9 is a spring 17 in the form of a tension spring, a spring preload adjuster 30 is preferably, but not necessarily, provided to allow to adjust the preload of the tension spring. The spring preload adjuster 30 can be configured to adjust the preload of the tension spring by adjusting the length the tension spring has in the opening position of the actuating mechanism 6 i.e. to adjust the length the tension spring has when the closing blades 4 are in the open position. The effect of this is that the more the tension spring is preloaded in other words extended, the more the tension spring will restrict further extension of the tension spring. Because the tension spring is functionally connected between the frame 2 and the actuating mechanism 6, the pressure increase in the flow channel 3 sensed by at least one of the closing blades and required to move the closing blades 4 into the closed position so as to prevent air flow through the blast damper 1 will raise when the preload of the tension spring is increased. Additionally, the tension spring will more effectively, in other words, with a greater force urge the closing blades 4 into the open position. In the figures the spring preload adjuster 30 is provided between the frame and the tension spring. Alternatively the spring preload adjuster 30 could be provided between the actuating mechanism 6 and the tension spring. The spring preload adjuster 30 can for example comprise a threaded pin 31 that is held in a hole 32 at the frame 6 by means of a nut 33 threaded on the threaded pin 31 and that is attached to the tension spring so that by turning the threaded pin 31 and the nut 33 with respect to each other, the position of the threaded bar 31 with respect to the frame 2 will change and the preloading of the tension spring will change because the length of the tension spring change.

[0021] The energy storing device 9 is preferably, but not necessarily, as illustrated in the figures, a spring 17 that is functionally connected between the frame 2 and the common operating lever 8 of the actuating mechanism 6. The spring 17 is preferably, but not necessarily, a tension spring.

[0022] The frame 2 comprises preferably, but not necessarily, a first profile section 24, a second profile section 25 that is parallel with the first profile section 24, a third profile section 26, and a fourth profile section 27 that is parallel with the third profile section 26 so that the first profile section 24 and the second profile section 25 extend in parallel with the pivot axes of the closing blades 4, and so that the first profile section 24, the second profile section 25, the third profile section 26, and the fourth profile section 27 together limits the flow channel 3.

[0023] Each closing blade 4 have preferably, but not necessarily, a leading edge 18 provided with a leading end section 19 that extends perpendicularly to a middle section 20 of the closing and a trailing edge 21 provided with a trailing end section 22 that extends perpendicularly to the middle section 20 of the closing blades 4 so that the closing blades 4 have an U-shaped cross-section form. If the frame 2 comprises, a first profile section 24, a second profile section 25 that is parallel with the first profile section 24, a third profile section 26, and a fourth profile section 27 that is parallel with the third profile section 26 so that the first profile section 24 and the second profile section 25 extend in parallel with the pivot axes of the closing blades 4, and so that the first profile section 24, the second profile section 25, the third profile section 26, and the fourth profile section 27 together limits the flow channel 3 and if each closing blade 4 have a leading edge 18 provided with a leading end section 19 that extends perpendicularly to a middle section 20 of the closing and a trailing edge 21 provided with a trailing end section 22 that extends perpendicularly to the middle section 20 of the closing blades 4 so that the closing blades 4 have an U-shaped cross-section form, the closing blades 4 are preferably, but not necessarily, dimensioned so that when each closing blade 4 is in the closed position, the leading end section of the closing blade 4 settles against the middle section of the adjacent closing blade 4 and so that the leading end section of the closing blade 4 closest to the first profile section 24 of the frame 2 settle against the first profile section 24 of the frame 2, and so that the trailing end section of the closing blade 4 closest to the second profile section 25 of the frame 2 settle against the second profile section 25 of the frame 2.

[0024] In the blast damper 1 illustrated in the figures, the first profile section 24 of the frame 2 has a step formation 23 and the leading end section of the closing blade 4 closest to the first profile section 24 of the frame 2 settle against the step formation of the first profile section 24 of the frame 2. Provision of such leading end section and of such trailing end section makes the closing blades 4 stiffer and makes the closing blades 4 to more securely close the flow channel 3 in the closed position.

[0025] In the flow channel 3 can flow controllers 28 be provided between two adjacent closing blades 4, as illustrated in the figures. In the figures, the flow controllers 28 extend between the third profile section 26 and the fourth profile section 27 essentially parallel to the flow channel 3 and to the flow direction of the blast damper 1 and essentially perpendicularly to the third profile section 26 of the frame 2 and to the fourth profile section 27 of the frame 2 and essentially in parallel with the first profile section 24 of the frame 2 and the second profile section 25 of the frame 2. A support 29 for the flow controllers 28 can be provided essentially in the middle of the flow channel 3. The support 29 can, as illustrated in the figures, extend between the first profile section 24 and the second profile section 25 essentially parallel to the flow channel 3 and to the flow direction of the blast damper 1 and essentially perpendicularly to the first profile section 24 of the frame 2 and to the second profile section 25 of the frame 2 and essentially in parallel with the third profile section 26 of the frame 2 and with the fourth profile section 27 of the frame 2. The closing blades 4 can be dimensioned so, as illustrated in the figures, that when each closing blade 4 is in the closed position, the middle section of the closing blades 4, except for the middle section of the closing blade 4 closest to the first profile section 24 of the frame 2 settle against the flow controllers 28. It is apparent to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.


Claims

1. A blast damper (1) comprising

a frame (2) defining a flow channel (3) for air flow through the blast damper (1),

closing blades (4) pivotally arranged in the flow channel (3), wherein each closing blade (4) can be pivoted about a pivot axis between a closed position and an open position and wherein each closing blade (4) is pivotally supported at the frame (2) by means of shaft means (5),

an actuating mechanism (6) comprising turning levers (7) so that one turning lever (7) is fixed to shaft means (5) of each closing blade (4) and a common operating lever (8) is turnably fixed to each turning lever (7) such that the closing blades (4) are configured to simultaneously pivot between the closed position so as to prevent air flow through the blast damper (1) and so that the actuating mechanism (6) takes a closing position, and the open position so as to allow air flow through the blast damper (1) and so that the actuating mechanism (6) takes an opening position, and

an energy storing device (9) functionally connected to the actuating mechanism (6),

wherein the closing blades (4) are configured to move into the closed position in response to a pressure increase in the flow channel (3) sensed by at least one of the closing blades (4),

characterized

by the energy storing device (9) is configured to be loaded with energy when the closing blades (4) pivots into the closed position, wherein said energy loaded to the energy storing device (9) is configured to urge the closing blades (4) into the open position, and

by an adjustable stopper mechanism (10) functionally connected to the actuating mechanism (6) for setting the opening position of the actuating mechanism (6).


 
2. The blast damper (1) according to claim 1, characterized
by the adjustable stopper mechanism (10) being functionally connected to the actuating mechanism (6) by the actuating mechanism (6) being configured to abut a first movement limiter (16) of the adjustable stopper mechanism (10) in the opening position of the actuating mechanism (6).
 
3. The blast damper (1) according to claim 2, characterized

by the adjustable stopper mechanism (10) comprising an elongated opening (12) and a pin member (11) that is configured to move in the elongated opening (12),

by the first movement limiter (16) of the adjustable stopper mechanism (10) is formed by a first end (13) of the elongated opening (12), wherein the pin member (11) is configured to abut the first end (13) of the elongated opening (12) in the opening position of the actuating mechanism (6),

by the pin member (11) of the adjustable stopper mechanism (10) is configured to move in a direction towards a second end (14) of the elongated opening (12) of the adjustable stopper mechanism (10) when the closing blades (4) pivot to the open position, and

by at least one of the pin member (11) and the elongated opening (12) being adjustable arranged with respect to the frame (2).


 
4. The blast damper (1) according to claim 3, characterized
by the pin member (11) of the adjustable stopper mechanism (10) is configured to be spaced apart from the second end (14) of the elongated opening (12) in the closing position of the actuating mechanism (6).
 
5. The blast damper (1) according to claim 3 or 4, characterized

by the actuating mechanism (6) being provided with the pin member (11) of the adjustable stopper mechanism (10), and

by the elongated opening (12) of the stopper mechanism (10) being provided in an adjustable stopper member (15) that is adjustable provided at the blast damper (1).


 
6. The blast damper (1) according to claim 5, characterized
by one of the turning levers (7) of the actuating mechanism (6) being provided with the pin member (11) of the adjustable stopper mechanism (10).
 
7. The blast damper (1) according to claim 5 or 6, characterized
by the adjustable stopper member (15) being adjustable attached to the frame (2).
 
8. The blast damper (1) according to any of the claims 1 to 7, characterized
by the energy storing device (9) being a spring (17) that is functionally connected between the frame (2) and the actuating mechanism (6).
 
9. The blast damper (1) according to any of the claims 1 to 8, characterized
by the energy storing device (9) being a spring (17) that is functionally connected between the frame (2) and the common operating lever (8) of the actuating mechanism (6).
 
10. The blast damper (1) according to claim 8 or 9, characterized
by the spring (17) being a tension spring.
 
11. The blast damper (1) according to claim 10, characterized
by a spring preload adjuster (30) for adjusting a preload that the tension spring has in the opening position of the actuating mechanism (6).
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description