A cooling and heating dual-purpose circulation fan

Abstract

The present invention discloses a dual-purpose circulation fan for cold and warm air, which comprises a front net, a rear net, and a fan blade, an air guide device and a heating device in a space formed by the front net and the rear net in sequence, wherein the front portion of the rear net forms an axial exhaust duct, and the rear portion thereof is provided with an air inlet structure, the fan blade, the air guide device and the heating device are arranged in the axial exhaust duct, the heating device is provided with a driving device for driving the heating device to rotate, so that the heating device can be rotatably arranged in the ventilation duct of the air guide device; the heating device is driven to rotate so that the heat dissipation surface of the heating device faces the ventilation duct of the air guide device, the ventilation duct of the air guide device is partially closed or completely closed, and the cold air is discharged from the ventilation duct and the front net of the air guide device after being heated by the heating device; the heating device is rotated in the opposite direction, the ventilation duct of the air guide device is partially opened or completely opened, and the cold air is discharged through the ventilation duct and the front net of the air guide device.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a cold and warm air switchable dual-purpose circulation fan, which mainly realizes the application of a PTC heating element or a intensive heating element in the circulation fan. Background Art

[0002] A circulation fan is a small fan with axial flow blades. A circular air duct is set around the blades in the radial direction, or a part of the cylindrical shell is used as the air duct. When the circulation fan is working, air can enter from the grille or mesh-shaped body shell in both radial and axial directions behind the blades to ensure sufficient air volume, and under the action of the air duct, a longer air supply distance can be achieved.

[0003] Similarly, the existing heaters also use axial flow fan blades, and a heating component is arranged axially rearward of the fan blades. At the same time, an air duct is arranged radially around the fan blades and the heating component (or a part of the fuselage shell is used as the air duct). That is, the fan blades and the air duct are wrapped in the same air duct. When working, the air enters from the grid or mesh at the rear of the fuselage shell corresponding to the axial rear of the air duct, ensuring sufficient heat dissipation air volume for the heating component, but the air volume, air supply distance, etc. are much smaller than those of the circulating fan with the same fan blades.

[0004] In addition, Chinese patent document CN 206903897 discloses a natural wind / warm air dual-purpose electric circulation fan, which adopts a fixed heating element of a mica plate heating frame. However, when a PTC heating element with dense heat dissipation aluminum sheets is used, the fixed PTC heating element has a huge impact on the actual wind flow of the product. Since dense heating elements such as PTC have good heat dissipation performance, how to achieve effective compatibility between dense heating elements and circulation fans with longer conveying distances so that the air output and air supply distance are optimized has become an important technical problem that needs to be urgently solved by dense cold and heating circulation fans such as PTC. Summary of the invention

[0005] The purpose of the present invention is to provide a solution to the problem that when the existing fixed heating element adopts a intensive heating element combined with a circulating fan, the circulating fan and the heating element cannot be well compatible in terms of the two main performances of air supply and heating. To this end, the present invention provides a dual-purpose circulating fan that can switch between cold and warm air.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A dual-purpose circulating fan for cold and warm air comprises, in sequence, a front net, a rear net, and a fan blade, an air guide device and a heating device located in a space formed by the front net and the rear net, the front portion of the rear net forming an axial exhaust duct, and the rear portion thereof is provided with an air inlet structure, the fan blade, the air guide device and the heating device are arranged in the axial exhaust duct, the heating device is provided with a driving device for driving it to rotate, so that the heating device can be rotatably arranged in the ventilation duct of the air guide device; the heating device is driven to rotate so that the heat dissipation surface of the heating device faces the ventilation duct of the air guide device, the ventilation duct of the air guide device is partially closed or completely closed, and the cold air is heated by the heating device and discharged through the ventilation duct and the front net of the air guide device; the heating device is rotated in the opposite direction, the ventilation duct of the air guide device is partially opened or completely opened, and the cold air is discharged through the ventilation duct and the front net of the air guide device.

[0008] The heating device is provided with at least two, and a rotating shaft is respectively arranged at both ends of each heating device. An axial hole which is rotatably connected with the rotating shaft is arranged at the installation position corresponding to the rotating shaft on the air guide device. The driving device is a driving motor fixed on the air guide device, and is drivingly connected with the rotating shaft of each heating device; each driving motor controls the corresponding heating device to rotate synchronously, and opens or closes the ventilation duct on the air guide device.

[0009] Or preferably, at least two heating devices are provided, a rotating shaft is respectively arranged at both ends of each heating device, and an axial hole that forms a rotational connection with the rotating shaft is provided at the installation position corresponding to the rotating shaft on the air-guiding device; the driving device includes a driving motor and a gear, and a gear is respectively arranged on the rotating shaft at one end of each heating device, and a meshing transmission is formed between the gears. The driving motor is fixed on the air-guiding device and forms a driving connection with the rotating shaft on one of the heating devices. The heating devices are driven to rotate by the driving motor, so that the heating devices form a synchronous rotation, and the ventilation ducts on the air-guiding device are synchronously opened or closed.

[0010] The heating device includes a heating element and a heating element bracket. The heating element is arranged in an inner frame formed by the heating element bracket. The rotating shaft is coaxially arranged at the upper and lower ends of the heating element bracket respectively. The heating element bracket is rotatably arranged in the shaft hole of the air guide device.

[0011] The heating element is preferably a PTC heating element.

[0012] The outer edge of the air guide device is in contact with the axial exhaust duct on the rear net, and the heating device is arranged at the air inlet position of the ventilation duct of the air guide device.

[0013] A conical ventilation duct is formed in the middle of the air guide device, and the size of its air inlet end is larger than the size of its air outlet end. When the heating device closes the ventilation duct, the outer edge area of ​​the heating device forms a seal with the air inlet of the ventilation duct.

[0014] The front net and the rear net are circular structures, and the ventilation duct is an annular structure that is approximately small in the front and large in the back, or a partially conical structure.

[0015] The fan blades are axial flow fan blades.

[0016] The air inlet structure of the rear net is in the shape of a grid or a mesh.

[0017] The technical solution of the present invention has the following advantages:

[0018] A. The present invention provides a driving device on the heating device to make it rotate. By driving the heating device to rotate, the ventilation duct can be closed and opened. When used as a circulating fan, the heating device does not work. At this time, the heating device rotates to open the ventilation duct. There are sufficient radial and axial air inlet areas behind the fan blades to ensure sufficient air inlet volume. At the same time, sufficient air supply distance is ensured under the action of the air duct. When used as a heater (air heater), the heating device works. At this time, the driving device drives the heating device to rotate, so that the heating device rotates until the ventilation duct is closed. The axial air inlet behind the fan blade has sufficient air volume to pass through the heating element part under the action of the air guide device, thereby ensuring good heat dissipation.

[0019] B. The use of an automatically switching heating device can greatly improve the performance and effect of the circulation fan mode, greatly satisfying the performance and effect of the product in different states and modes, so that the PTC type cooling and heating circulation fan will not be limited by the form of the heating element. At the same time, the PTC type cooling and heating circulation fan can be used as a dual product both as a heater and a circulation fan, raising the product positioning to another level. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a three-dimensional cross-sectional view of the cooling and heating circulation fan provided by the present invention;

[0022] Figure 2 It is an exploded view of the cold and warm circulation fan with switchable heating element provided by the present invention;

[0023] Figure 3It is a schematic diagram of air flow of the cooling and heating circulation fan provided by the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the heating element assembly and its bracket of the cooling and heating circulation fan in the warm air state;

[0025] Figure 5 It is a schematic diagram of the structure between the heating element assembly and its bracket of the cold and warm circulation fan in the cold air state.

[0026] The following are marked in the figure:

[0027] 1-Front Net

[0028] 2-Back Net

[0029] 21- axial exhaust duct, 22- air inlet structure

[0030] 3- Wind blade;

[0031] 4-air guide device, 4a-ventilation duct, 4b-axis hole

[0032] 5-heating device, 5a-rotating shaft

[0033] 51-heating element, 52-heating element bracket

[0034] 6- Driving device,

[0035] 61-driving motor, 62-gear

[0036] 7- Base

[0037] 8-motor, 81-drive shaft

[0038] 9-support rod, 91-support shaft hole. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 and Figure 2As shown, the present invention provides a dual-purpose circulation fan for cold and warm air, which comprises a base 7, a front net 1, a rear net 2, and a fan blade 3, a wind guide device 4, a heating device 5 and a rear driving motor 8 in the space formed by the front net 1 and the rear net 2, the motor 8 is arranged at the rear end of the rear net 2, and the driving shaft 81 thereon extends toward the front net direction, passes through the heating device 5 and the wind guide device 4 in sequence, and forms a fixed connection with the fan blade 3, an axial exhaust duct 21 is formed in the front part of the rear net 2, and an air inlet structure 22 is provided in the rear part, the fan blade 3, the wind guide device 4 and the heating device 5 are arranged in the axial exhaust duct 21, and a driving device 6 for driving the heating device 5 to rotate is provided on the heating device 5, so that the heating device 5 can be rotatably arranged in the ventilation duct 4a of the wind guide device 4. The fan blade 3 here is preferably an axial flow fan blade, and the air inlet structure of the rear net adopts a grid or a mesh shape.

[0041] The starting motor 8 drives the fan blade 3 to rotate, and the generated wind enters the air inlet structure 22. When warm air is needed, the heating device is put into operation; at the same time, the heating device 5 is driven to rotate, so that the heat dissipation surface of the heating device 5 faces the ventilation duct 4a of the air guide device 5, and the ventilation duct 4a of the air guide device 4 is partially closed or completely closed, and the cold air is heated by the heating device 5 and discharged through the ventilation duct 4a of the air guide device 4 and the front net 1, thereby realizing the warm air output; the heating device 5 is rotated in the opposite direction, and the ventilation duct 4a of the air guide device 4 is partially opened or completely opened, and the cold air is discharged through the ventilation duct 4a of the air guide device 4 and the front net 1.

[0042] The present invention provides at least two heating devices 5 in the air guide device, and a rotating shaft 5a is provided at both ends of each heating device 5. An axial hole 4b that is rotatably connected to the rotating shaft 5a is provided at the installation position corresponding to the rotating shaft 5a on the air guide device 4. The driving device 6 is a driving motor fixed to the air guide device 4, and is drivingly connected to the rotating shaft 5a of each heating device 5; each driving motor controls the corresponding heating device 5 to form synchronous rotation, and opens or closes the ventilation duct 4a on the air guide device 4. A driving motor is provided on each heating device to drive the heating device 5 to rotate, so as to realize independent control of each heating device.

[0043] Of course, the present invention still adopts another structural form of driving device, such as Figure 2As shown, two heating devices 5 are provided, and of course three or more heating devices can be provided. A rotating shaft 5a is provided at both ends of each heating device 5. A shaft hole 4b that forms a rotational connection with the rotating shaft 5a is provided at the installation position corresponding to the rotating shaft 5a on the air guide device 4. The rotating shafts 5a coaxially arranged at both ends of the heating device are inserted into the shaft holes 4b, and the rotating shafts can rotate freely in the shaft holes; the driving device 6 here includes a driving motor 61 and a gear 62. A gear 62 is provided on the rotating shaft 5a at one end of each heating device 5, and a meshing transmission is formed between the two gears 62. The driving motor 61 is fixed on the air guide device 4 and forms a driving connection with the rotating shaft 5a located below one of the heating devices. The driving motor 61 drives the heating device 5 to rotate, so that the heating devices 5 form a synchronous rotation, and the ventilation duct 4a on the air guide device 4 is synchronously opened or closed. The lower end of one of the gears 62 is connected to the driving motor 61; the driving motor 4 is preferably a stepping motor in the present invention.

[0044] In the present invention, the preferred scheme is the gear set method, but it is not limited to this. As long as other transmission methods can realize the rotation of the heating device, they all belong to the protection scope of the present invention.

[0045] The opening method of the two heating devices can be as follows Figure 4 The back-to-back opening method shown can also be opened in a similar way to two doors. The specific position of the heating device can be set at the inlet position of the ventilation duct of the air guide device, the middle position or the position close to the outlet, as long as sufficient space is provided for the rotation of the heating device, it is within the protection scope of the present invention.

[0046] When the ventilation duct is long or the front-to-back distance of the circulation fan is large, a reinforced support rod is further arranged in the air guide device, and a support shaft hole 9 is arranged in the middle of the support rod. The driving shaft of the motor passes through the support shaft hole 9 to form a fixed connection with the fan blade 3, and the motor driving shaft forms a rotational connection with the support shaft hole, which can play a certain supporting role on the driving shaft.

[0047] The heating device 5 in the present invention comprises a heating element 51 and a heating element bracket 52. The heating element 51 is arranged in an inner frame formed by the heating element bracket 52. The rotating shaft 5a is coaxially arranged at the upper and lower ends of the heating element bracket 52 respectively. The heating element bracket 52 is rotatably arranged in the shaft hole 4b of the air guide device 4. The heating element 51 in the present invention preferably adopts a PTC heating element. Of course, a densely wound heating element structure can also be adopted, which will not cause any influence on the output of cold air.

[0048] The front net and the rear net are preferably circular structures, and other shapes can also be used, which are not limited here. The ventilation duct 4a in the air guide device is an annular structure that is approximately small in the front and large in the back, or a partially conical structure. Therefore, the outer edge of the air guide device 4 is in contact with the axial exhaust duct 21 on the rear net 2, so as to prevent the wind in the axial air inlet structure from directly entering the front net and being discharged from the edge of the air guide device, thereby affecting the heating effect of the warm air. The heating device 5 is preferably arranged at the air inlet position of the ventilation duct 4a of the air guide device 4.

[0049] Of course, a conical ventilation duct 4a may also be formed in the middle of the entire air guide device 4, the size of its air inlet end is larger than the size of its air outlet end, and the shape of the conical cross section is not specifically limited. When the heating device 5 completely closes the ventilation duct 4a, the outer edge area of ​​the heating device 5 forms a seal with the air inlet of the ventilation duct 4a.

[0050] The rear net 2 is installed on the base 7 here; the base 7 can serve as a supporting structure of the rear net 2 and an installation location for control, display, and swing head.

[0051] During specific operation, the two gears are in a state of mutual meshing because of their normal state; the driving motor drives one of the gears to rotate, and the other gear also rotates; the rotation of the gears means that the heating element 51 and the heating element bracket 52 rotate at the same time, completing the rotation of the entire heating part, that is, the state of switching between cold and warm.

[0052] In the hot air state, the PTC heating element rotates to the ventilation duct of the air guide device, allowing the air in the ventilation duct of the air guide device to flow through the heating element; conversely, in the cold air state, the PTC heating element rotates and deviates from the ventilation duct of the air guide device, the ventilation duct is opened and a large amount of air passes through quickly; the rotation of the two heating elements is similar to the working principle of a double door.

[0053] The fan blades rotate and pass through the grid or mesh air inlet at the rear of the rear net to realize radial and axial air intake at the rear, and then after axial air guidance by the air guide device, the air intake passes through the heating element assembly under the action of the air guide duct to realize warm air supply, which greatly improves the performance and effect in the circulation fan mode, greatly satisfies the performance and effect of the product in different states and modes, and makes the PTC type heating and cooling circulation fan not limited by the form of the heating element. At the same time, the PTC type heating and cooling circulation fan can be used as a dual product of both a heater and a circulation fan, which elevates the product positioning to another level.

[0054] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A dual-purpose circulating fan for cooling and heating air, comprising, in sequence, a front net (1), a rear net (2), and a fan blade (3), an air guide device (4) and a heating device (5) located in a space formed by the front net (1) and the rear net (2), wherein the front portion of the rear net (2) forms an axial exhaust duct (21), and the rear portion thereof is provided with an air inlet structure (22), and the fan blade (3), the air guide device (4) and the heating device (5) are arranged in the axial exhaust duct (21), characterized in that: The heating device (5) is provided with a driving device (6) for driving the heating device (5) to rotate, so that the heating device (5) can be rotatably arranged in the ventilation duct (4a) of the air guide device (4); the heating device (5) is driven to rotate so that the heat dissipation surface of the heating device (5) faces the ventilation duct (4a) of the air guide device (5), the ventilation duct (4a) of the air guide device (4) is partially closed or completely closed, and the cold air is heated by the heating device (5) and discharged through the ventilation duct (4a) and the front net (1) of the air guide device (4); the heating device (5) is rotated in the opposite direction, the ventilation duct (4a) of the air guide device (4) is partially opened or completely opened, and the cold air is discharged through the ventilation duct (4a) and the front net (1) of the air guide device (4).

2. The dual-purpose cooling and heating air circulation fan according to claim 1, characterized in that: At least two heating devices (5) are provided, and a rotating shaft (5a) is respectively arranged at both ends of each heating device (5); an axial hole (4b) which is rotatably connected to the rotating shaft (5a) is provided at an installation position on the air guide device (4) corresponding to the rotating shaft (5a); the driving device (6) is a driving motor fixed to the air guide device (4) and is drivingly connected to the rotating shaft (5a) of each heating device (5); each driving motor controls the corresponding heating device (5) to rotate synchronously, and opens or closes the ventilation duct (4a) on the air guide device (4).

3. The cooling and heating dual-purpose circulation fan according to claim 1, characterized in that: The heating devices (5) are provided with at least two, and a rotating shaft (5a) is respectively arranged at both ends of each of the heating devices (5). An axial hole (4b) which is rotatably connected with the rotating shaft (5a) is arranged at an installation position on the air guide device (4) corresponding to the rotating shaft (5a); the driving device (6) comprises a driving motor (61) and a gear (62). A gear (62) is respectively arranged on the rotating shaft (5a) at one end of each of the heating devices (5), and meshing transmission is formed between the gears (62). The driving motor (61) is fixed on the air guide device (4) and is drivingly connected with the rotating shaft (5a) on one of the heating devices (5). The driving motor (61) drives the heating devices (5) to rotate, so that the heating devices (5) rotate synchronously, and the ventilation duct (4a) on the air guide device (4) is synchronously opened or closed.

4. The cooling and heating air dual-purpose circulation fan according to claim 2 or 3, characterized in that: The heating device (5) comprises a heating element (51) and a heating element bracket (52); the heating element (51) is arranged in an inner frame formed by the heating element bracket (52); the rotating shaft (5a) is coaxially arranged at the upper and lower ends of the heating element bracket (52); and the heating element bracket (52) is rotatably arranged in the shaft hole (4b) of the air guide device (4).

5. The cooling and heating dual-purpose circulation fan according to claim 4, characterized in that: The heating element (51) is a PTC heating element.

6. The dual-purpose cooling and heating air circulation fan according to claim 1, characterized in that: The outer edge of the air guide device (4) is in contact with the axial exhaust duct (21) on the rear net (2), and the heating device (5) is arranged at the air inlet position of the ventilation duct (4a) of the air guide device (4).

7. The dual-purpose cooling and heating air circulation fan according to claim 6, characterized in that: A conical ventilation duct (4a) is formed in the middle of the air guide device (4), the size of its air inlet end is larger than the size of its air outlet end, and when the heating device (5) closes the ventilation duct (4a), the outer edge area of ​​the heating device (5) forms a seal with the air inlet of the ventilation duct (4a).

8. The cooling and heating dual-purpose circulation fan according to claim 7, characterized in that: The front net (1) and the rear net (2) are circular structures, and the ventilation duct (4a) is an annular structure that is smaller in the front and larger in the back, or a partially conical structure.

9. The dual-purpose cooling and heating air circulation fan according to claim 1, characterized in that: The fan blade (3) is an axial flow fan blade.

10. The dual-purpose cooling and heating air circulation fan according to claim 1, characterized in that: The air inlet structure of the rear net is in the shape of a grid or a mesh.

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