The invention relates to the technical field of air conditioning, in particular to a channel-variable cooling and heating circulatingfan.

Heater or fan is necessary electric appliance in modern home. At present available product on the market either is a single heater, or is a single fan. There is a lack of products that have both the heating function of a heater and the blowing function of a fan, especially lack of cooling and heating circulatingfan. Cooling and heating circulatingfan can be used as a heater, also as a fan, so it is a multi-purpose machinewith both cooling and heating functions. Since the cooling and heating circulating fan always has a fixed product structure, blades of an axial fan suck air from the radial direction and the axial direction simoutaniously, and the air intake volume is large. When a warm wind is needed, the hot wind blown out is also mixed with cold wind, resulting in poor body feelingespecially around the entire wind outlet net.

For example, Chinese patent literature CN 206903897 discloses a dual electric natural wind/warm air circulation fan. When used as a heater, the radial air intake does not pass through the heating body. Therefore, the hot air blown out is obviously mixed with cold air, with a strong wind force, which gives the user an unsatisfactory body feeling. In order to improve the heating problems of axial flow blades in cooling and heating circulating fans, it is urgent to optimize the structure of existing cooling and heating circulating fans, so as to satisfy people's comfort in heating without affecting the cold air volume.

The objective of the present invention is to solve the technical problems that hot air supply by existing axial flow cooling and heating circulatingfans is large in air volume and is mixed with cold air which causes unsatisfactory body feeling. Therefore, the present invention provides a channel-variable cooling and heating circulatingfan, which can realize the adjustment of the cooling air volume, and can well improve the body feeling during heating.

In order to achieve the above objective, the present invention provides a channel-variable cooling and heating circulating fan as defined in claim 1.

In some further embodiments, the annular windshield ring is an annular housing of a cylindricalshape, which is sleeved outside or inside the rear net cover and forms a slidable connection with the rear net cover in the axial direction.

In some embodiments, the rear net cover is provided with a guide groove or guide rib arranged axially, the annular windshield ring is provided with a corresponding guide rib or guide groove on the housing thereof, and the annular windshield ring is slidable with respect to the rear net cover along the axial direction.

In some embodiments, the heating component comprises a heating support and a heating body, wherein an axial air channel is formed inside the heating support and is airtight in a circumferential direction, and wherein the heating body is fixed inside the axial air channel of the heating support, and the heating support forms a detachable fixing connection with the rear net cover, and wind generated by the fan blade blows through the axial air channel and the heating body into the sealed annular air channeland flows out therefrom.

Preferably, the annular windshield ring is arrangedinside the heatingsupport, and is provided with an switch handle thereon radially extending out through an axial elongated hole of the heating support and extending out of an outer side of the rear net cover; the annular windshield ring is driven to move along an inner side of the heating support by axially moving the switch handle, thereby gradually closing or opening the radial air intake channel on the rear net cover.

Preferably, the axial air channel is a tapered air channel with a ventilation cross-section size which decreases gradually in a direction towards the fan blade.

Preferably, the radial air intake channel consists of a plurality rows of grids or air holes axially arranged on the rear net cover.

In some embodiments, a front net is further provided in front of the rear net coverand forms a detachable fixed connection with the sealed annular air channel.

In some embodiments, the cooling and heating circulating fan is also provided with a base which is in a rotary connection with the outer side of the rear net cover.

The present invention has the following advantages:

1. A.In the present invention, an annular windshield ring is provided on the radial air intake channel of the rear net cover. The annular windshield ringis capable of axially moving, thereby controlling the opening and closing of the radial air intake channel, realizing switch between cold air and warm air, thus avoding mixing of cold air in warm air and effectively improving the user's body feeling. Meanwhile, in the case of cold air, the annular windshield ring can also be used to adjust the air inlet size of the radial air inlet channel, so that the air intakevolume of the radial cold air can be adjustedand the total amount of air outputcan be controlled, and thus the user experience can be better.
2. B.In one embodiment of the present invention, the axial air channel is a tapered air channel,so that surrounding aircan be effectively collected toform anintake air flow, and the intake air flow can be blown out intensively and evenly,thus the blowing feeling is stronger.Such structure is simple and novel.The axial moving of the annular windshield ring can realize the opening and closing control of the radial air intake channel, so thatthe radial air intake volume can be well controlledwithoutreducingthe air intake volume in the axial air channel, thus users get more moderate experience when heating.
3. C.In one embodiment of the present invention, the annular windshield ring works together with thetapered axial air channelto fully optimize the performance of the product under the condition of warm air on the one hand and also rapidly heat up the environment within a certain space and shotenthe heating time on the other hand, so that users can get warmth in the shortest time and thus get more comfortable experience.

In order to make the contents of the invention easier to be clearly understood, the present invention is further described according to the appended drawings.It should be understood that the appended drawings described below show some embodiments of the present invention.

Brief description of the drawings are as below:

• Figure 1 is a three-dimensional diagram of a cooling and heating circulating fan provided by the present invention;
• Figure 2 is athree-dimensional diagram showing an exploded view of the body in Figure 1.
• Figure 3 is a three-dimensional diagram of the annular windshield ring in Figure 1.
• Figure 4 is a sectional view of a local area whenboth radial and axial intake air are allowed(showing a schematic diagram of air flow when the annular windshield ring is in an opening state);
• Figure 5 is a sectional view of alocal area when the axial intake air is allowed but the radial air intake channel is closed (showing a schematic diagram of air flow whenthe annular windshield ring is in a closing state);
• Figure 6 is a schematic diagram of cold wind state when the annular windshield ring is in an opening state;
• Figure 7 is a schematic diagram of warm wind state when the annular windshield ring is in a closing state.

Reference numbers:

• 1- Body;
• 11 - Rear net cover;
• 111- Radial air intake channel;
• 112- Sealed annular air channel;
• 113- Intake air grids;
• 12- Drive device;
• 121- Motor, 122- Motor cover;
• 13- Heating component;
• 131- Heating support;
• 132- Heating body;
• 14- Fan blade;
• 15- Annular windshield ring;
• 16- Switch handle;
• 17- Front net;
• 2-Base;
• a- Axial air channel;
• b- Axial elongated hole;
• c- Guide groove or guide rib.

The present invention will be described clearly and completely in combination with the appended drawings. Obviously, the described embodiments are just some of the embodiments of the invention rather than all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art which fall within the wording of at least claim 1, also fall within the protection scope of the present invention.

As shown in Figure 1 and Figure 2, the present invention provides a channel-variable cooling and heating circulating fan, generally comprising a body 1 and a base 2.The body 1 comprises a rear net cover 11, a drive device 12, a heating component 13, a fan blade 14 and front net17. The front net 17 forms a detachable fixed connection with asealed annular air channel 112, for providng safety protection and allowing output of wind. The drive device 12 and the heating component 13 are arranged inside the rear net cover 11. The drive device 12 has a rotatableshaft going through the heating component 13 to connect to the fan blade 14. The rear net cover 11 is provided with a radial air intake channel 111 of an annular shape thereon between the fan blade 14 and the heating component 13, and a sealed annular air channel 112 is formed on a front end of the rear net cover 11.For example, the sealed annular air channel112is a cylindrical housing formed by looping a plate without holes into a ring.The rear net cover 11 is of gridded structure, and a closed air intakegrid 113 is formed at the rear end thereof. Motor 121 is installed at the bottom of the inner cavity of the rear net cover 11. Motor cover 122 covers the motor 121 and is fixed together with the rear net cover 11. The sealed annular air channel 112 and theradial air intake channel 111 are connected coaxially and successively. The radial air intake channel 111 is provided with an annular windshield ring 15. The annular windshield ring 15 has an axial size greater than or equal to an axial size of the radial air intake channel 111, and is capable of axially moving into and out of a position where the radial air intake channel 111 is located. Whenthe annular windshield ring15 is moved into the entire position of the radial air intake channel 111, theradial air intake channel 111 will be completely blocked, realizing the closing of theradial air intake channel 111, thereby preventing outside air from entering into thesealed annular air channel 112 through the radial air intake channel 111.Of course, when the annular windshield ring 15 is moved out of the position of the radial air intake channel 111, the radial air intake channel111 will be opened. Therefore, when heating mode is required, the user can choose to move the annular windshield ring 15 into theposition of the radial air intake channel 111 to completely cover the the radial air intake channel 111, thus blocking intake of radial wind. Axial wind produced by the rotating of the fan blade enters through intake air grids 113at the rear end of the rear net cover 11 and blows through theheating component, so that the hot wind blown out does not comprise cold wind. Of course, when warm air is not needed, the user can adjust the position of the annular windshield ring 15 according to specific conditions, thus the user can control the air volume by completely or partially opening the radial air intake channelaccording to personal preference.

As shown in Figure4, the annular windshield ring 15 is arranged movably in a position between the sealed annular air channel 112 and the heating component 13, i.e. the position of the axial direction air intake channel 111as shown in Figure 3. The annular windshield ring 15 is of a sizethat can completely covering theradial air intake channel 111. Herein the term "size" includes area, diameter, dimensions and shape, etc. The purpose is that it can close the radial air intake channel 111. Preferably, the annular windshield ring 15 adopted in the present invention is an annular housing of a cylindrical shape, which is sleeved outside or inside the rear net cover 11 and forms a slidable connection with the rear net cover 11 in the axial direction.Preferably, the annular windshield ring 15 is arranged inside the rear net cover 11 in the present invention.

The rear net cover 11 is provided with a guide groove or guide rib arranged axially thereon, and the annular windshield ring 15 is provided with a corresponding guide rib or guide groove "c"on the housing thereof, so that the guide groove or guide ribon the rear net cover 11 can engage with the guide rib or guide groove on theannular windshield ring 15, and the annular windshield ring15 is slidable with respect to the rear net cover 11 along the axial direction to realize the opening and closing of the radial air intake channel 111. Of course, the guidefeatures can also be arrange on the heating support 131 and the annular windshield ring 15. For example, two or more guidefeatures such as concave or convexcan be provided on the annular windshield ring 15, and the heating support 131 can be provided with corresponding guidefeaturesthereon which can match with the guide featureson the annular windshield ring 15.The specific matching section and shape of the guide features are not limited in the present invention. The guidefeaturesare given forschematically showing but not limiting the present invention, Other features or ways with guiding effect can also be used in the present invention. The purpose of the guide is to allow the annular windshield ring15 to slide back and forth more smoothly, preventing the annular windshield ring15 from rotating in a circular direction.

As shown in Figure 2, the heating component 13 comprises a heating support 131 and a heating body 132.An axial air channel "a" is formed inside the heating support 131 and is airtight in a circumferential direction. As shown in Figure 6, the heating body 132 is fixed inside the axial air channel "a" of the heating support 131, and the heating support 131 forms a detachable fixed connection with the rear net cover 11, so that wind generated by the fan blade 14 passes through intake air grids 113 andblows through the axial air channel "a" and the heating body 132 into the sealed annular air channel 112 and flows out therefrom.The heating body 132 adopted here are those existing in prior art, so its structural characteristics will not be described here.

In one embodiment, the annular windshield ring 15 is arranged inside the heating support 131, and is provided with an switch handle 16thereon.The switch handle 16radially extends out through an axial elongated hole "b"of the heating support 131 and extends out of an outer side of the rear net cover 11.The annular windshield ring 15 is driven to move along a side of the heating support 131 by axially moving the switch handle 16, thereby gradually closing or opening the radial air intake channel 111 on the rear net cover 11. Preferably, the switch handle 16 is fixed to anedge of the annular windshield ring 15.One or more switch handles 16 can be provided.There is no restriction to the number of the switch handles. The annular windshield ring 15 and the switch handle 16 may be integrated as a whole or may be separate parts, which is not restricted in the present invention.The purpose of the switch handle is just for easy operation to help moving the annular windshield ring15.

As shown in Figures6 and 7, the structureof the heating support 131 shows that an inner side of the heating support 131 forms an axial air channel "a" which is tapered in shape and has a ventilation cross-section size decreasing gradually in a direction towards the fan blade 14, so that surrounding air can be effectively collectedto form an intake air flow, and the user experience can be better.

Herein the radial air intake channel 111 consists of a plurality rows of grids or air holes axially arranged on the rear net cover 11. The mesh size of the grids or air holes on the rear net cover 11 is not specifically restricted.

The outer side of the rear net cover 11 forms a rotary connection with the base 2. The structure of the base 2 is known in prior art, so itwill not be described here.

As shown in Figure 2, the motor 121 and its shaft, front net 17, rear net cover 11 and fanblade 14 in the present invention are coaxialalong a central axis; In particular, the rear net cover 11, heating support 131 and sealed annular air channel112 are coaxialalong a central axis.

The annular windshield ring 15 is movableor slidable back and forth along the central axis with the assistance of the guide groove or guide ribunder the action of the switch handle 16, thereby closing or opening the radial air intake channel 111and adjusting the volume of the radial intake air. Of course, the annular windshield ring 15 can be manually driven or automatically driven. When the annular windshield ring 15 isautomatically driven, the automatic drive device can be composed of transmission structure and motor drive. For example, anelectric push rod can be adopted to drive the annular windshield ring 15 to move back and forth, which is not specifically described here.

As shown in Figures 5 and 7, when warm air is needed, the annular windshield ring 15 can be manually driven to move to close the radial air intake channel 111, thereby reducing the air intakearea and air intake volume and realizing axial air intake only, so that the wind coming out of the front net 17 is warmer and more uniform.

As shown in Figures 4 and 6, the annular windshield ring 15 can be manually driven to move to open the radial air intake channel 111,thus realizing the simultaneous radial and axial air intake in both directions, and thus increasing the air intakearea and air intakevolume, so that the wind coming out of the front net 17 is stronger and cooler.

As describedabove, the processes of opening and closing the radial air intake channelare the two most basic states of the implementation of the present invention. Of course, it is also possible to choose any real-time state between these two states to adjust the volume of the radial intake air. The opening size and closing size of theradial air intake channel depends on the actual demand of product design. The manual and automatic opening and closing modes also depend on the positioning of the product, whichare not restrictedor described herein.

It is to be understood that the above-described embodiments are merely given for clearly illustratingbut not limiting the embodiments. It will be apparent to one of ordinary skill in the art that other different forms of changes or variations can be made on the basis of the above description. It is to be understood that various changes or modifications may be made herein without departing from the scope of the invention as defined by the appended claims.