A cooling and heating circulation fan with variable air duct

Abstract

The present invention discloses a cold and warm circulation fan with variable air duct, wherein a radial air inlet channel is provided on a rear mesh cover between a fan blade and a heating component, a closed annular air duct is formed at the front end of the rear mesh cover, and the closed annular air duct is connected to the radial air inlet channel, and a plurality of windshields are also provided at the radial air inlet channel, and a rotating shaft and a limiting shaft are respectively provided at both ends of the windshield, and a plurality of front support plates and rear support plates with positioning holes and limiting long holes are respectively provided at both ends of the radial air inlet channel, and the rotating shafts and limiting shafts at both ends of the windshield are respectively placed in the positioning holes and limiting long holes corresponding to the front support plate and the rear support plate, and the rotating shaft of the windshield takes the center of the positioning hole as the axis, and the limiting shaft rotates along the limiting long hole; the width dimension of the windshield is greater than or equal to the width dimension of the radial air inlet gap formed between two adjacent windshields. The present invention is switched between cold air and warm air, and can completely avoid the phenomenon of mixing cold air in warm air, and effectively improve the user's body feeling.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and in particular to a cooling and heating circulation fan with a variable air duct. Background Art

[0002] Heaters or fans are essential electrical appliances for modern families. Currently, there are either single heaters or single fans on the market, and there are very few products that can truly combine the functions of heater heating and fan blowing, especially cold and warm circulation fans. Cold and warm circulation fans can be used as both heaters and fans, taking into account both cold and warm, and achieving multiple uses of one machine. Because cold and warm circulation fans have a fixed product structure, the axial flow fan blades intake air synchronously in both radial and axial directions, and the air intake volume is large. When warm air is needed, the hot air blown out is also mixed with cold air, especially around the entire front net, and the physical sensation is not very ideal.

[0003] For example, Chinese patent document CN 206903897 discloses a natural wind / warm wind dual-purpose electric circulation fan. When used as a heater, the radial air intake does not pass through the heating element. Therefore, the hot air blown out is obviously mixed with cold air, and the wind force is strong, which gives the user an unsatisfactory feeling. In order to improve the heating problem existing in the axial flow fan in the cold and warm circulation fan, it is urgent to optimize the structure of the existing cold and warm circulation fan to meet people's comfort when heating without affecting the cold air volume. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that the existing axial flow heating and cooling circulation fans have a large heating air volume and are mixed with unheated cold air, resulting in unsatisfactory body perception effects. To this end, the present invention provides a duct-variable heating and cooling circulation fan, which can not only adjust the cold air volume, but also greatly improve the heating body perception effect.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A cooling and heating circulation fan with variable air duct comprises a rear mesh cover, a driving device, a heating component and a fan blade, wherein the driving device and the heating component are arranged in the rear mesh cover, and the rotating shaft of the driving device passes through the heating component and is connected to the fan blade; a radial air inlet channel is also arranged on the rear mesh cover between the fan blade and the heating component, and a closed annular air duct is formed at the front end of the rear mesh cover, and the closed annular air duct is connected to the radial air inlet channel; a plurality of wind shields are also arranged at the radial air inlet channel in parallel with the axial direction of the fan blade, and the two ends of the wind shield are respectively provided with a wind shield along the length thereof A rotating shaft and a limiting shaft extending in the degree direction, a front support plate and a rear support plate are respectively provided at both ends of the radial air inlet channel, and a plurality of positioning holes and limiting long holes are respectively provided in the circumferential directions of the front support plate and the rear support plate in the axial direction, the rotating shaft and the limiting shaft at both ends of the wind shield are respectively placed in the positioning holes and the limiting long holes corresponding to the front support plate and the rear support plate, and the wind shield takes the center of the positioning hole as the axis, and the limiting shaft rotates along the limiting long hole; the width dimension of the wind shield is greater than or equal to the width dimension of the radial air inlet gap formed between two adjacent wind shields.

[0007] Preferably, the radial air inlet channel is arranged on the rear mesh cover in a 360-degree surrounding manner, and is composed of a plurality of rows of partition bars axially arranged on the rear mesh cover, and a radial air inlet gap is formed between two adjacent partition bars.

[0008] The positioning holes on the front support plate and the rear support plate are correspondingly arranged with the partition bars in the same radial direction of the rear mesh cover, and the radial air inlet gap formed when two adjacent wind shields are opened corresponds one to one with the radial air inlet gap formed between the two adjacent partition bars.

[0009] The partition bars are arranged at equal intervals along the circumferential direction of the radial air inlet channel.

[0010] Further preferably, the front support plate and the rear support plate are vertically arranged on the outer side surface of the rear mesh cover, and the axial spacing between the front support plate and the rear support plate is greater than or equal to the axial dimension of the radial air inlet channel.

[0011] Furthermore, a swing ring is also provided on the closed annular air duct located on the outer side of the front support plate, and a plurality of swing limit holes corresponding to the positions of the limit long holes are provided along the circumferential direction of the swing ring, and the limit axis at one end of the wind shield plate passes through the limit long hole on the front support plate and the swing limit hole on the swing ring in sequence.

[0012] Furthermore, the swing ring provided along the outer circumferential surface of the closed annular air duct is divided into a plurality of swing ring sections, and each swing ring section independently controls the swing angle of the wind shield plate in the corresponding area.

[0013] An annular groove is also provided on the outer circumferential surface of the closed annular air duct, the swing ring is rotatably arranged in the annular groove, and the rotation direction of the swing limit hole on the swing ring is opposite to the rotation direction of the limit long hole on the front support plate.

[0014] The heating component includes a heating bracket and a heating element. A circumferentially closed axial ventilation duct is formed in the heating bracket. The heating element is fixed in the axial ventilation duct of the heating bracket, and the heating bracket forms a detachable fixed connection with the rear mesh cover, so that the axial wind generated by the rotation of the fan blades enters the closed annular air duct through the axial ventilation duct and the heating element in sequence and is discharged.

[0015] The axial ventilation duct is a conical duct, and the ventilation cross-sectional size of the axial ventilation duct gradually decreases in the direction toward the fan blade.

[0016] A front net is also provided on the inner side of the front end of the rear net cover, and a detachable fixed connection is formed between the front net and the inner side surface of the closed annular air duct. When the radial air inlet channel is opened, the axial wind and radial wind generated by the rotation of the fan blades are discharged through the front net.

[0017] The cooling and heating circulation fan is also provided with a base, and the outer side surface of the rear mesh cover is rotatably connected with the base.

[0018] The technical solution of the present invention has the following advantages:

[0019] A. The present invention sets a plurality of flippable wind shields at the radial air inlet channel position of the rear mesh cover, and the limiting shafts at both ends of each wind shield can swing along the limiting long holes on the front support plate and the rear support plate to open and close the radial air inlet channel and switch between cold air and warm air, which can completely avoid the phenomenon of cold air being mixed in warm air and effectively improve the user's body feeling; at the same time, when cold air is used, the wind shield can also be used to adjust the size of the radial air inlet of the radial air inlet channel, and the total amount of air output can be controlled by adjusting the radial cold air inlet volume, which provides a stronger user experience.

[0020] B. The present invention establishes a tapered axial ventilation duct to effectively collect surrounding air to form an intake airflow, and blows it out in a concentrated and uniform manner, providing a stronger blowing feeling. The present invention has a simple structure and a novel structural form. The radial air intake channel can be opened and closed by flipping the wind shield, and the radial air intake volume can be well regulated. Without reducing the air intake volume of the axial ventilation duct, the user can have a softer heating experience.

[0021] C. The present invention arranges a plurality of windshields on the circumference of the rear mesh cover, and can also adjust the angles of the windshields in different areas separately, and establish a matching conical axial ventilation duct. In addition to fully optimizing the performance of the product in the warm air state, the environment within a certain space range can be quickly heated up to reach a predetermined heating temperature, shortening the heating time, so that the user can get warmth in the shortest time and have a more comfortable experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 any creative work.

[0023] Figure 1 This is a schematic diagram showing a cold wind state when the wind shield in the present invention is opened;

[0024] Figure 2 This is a schematic diagram showing a warm air state when the windshield in the present invention is closed;

[0025] Figure 3 It is a cross-sectional view of the whole machine provided by the present invention;

[0026] Figure 4 yes Figure 3 Schematic diagram of the connection structure of the swing ring, windshield and front and rear support plates in the upper middle part;

[0027] Figure 5 It is a characteristic schematic diagram of the swing ring, rear mesh cover and wind shield provided by the present invention;

[0028] Figure 6 It is a schematic diagram of radial and axial air inlet directions;

[0029] Figure 7 is a cross-sectional schematic diagram after the windshield is opened;

[0030] Figure 8 It is a cross-sectional schematic diagram after the wind shield is closed.

[0031] The following are marked in the figure:

[0032] 1-Body

[0033] 11-Rear grille

[0034] 111- radial air inlet channel, 1111- partition bar

[0035] 112-enclosed annular air duct, 1121-annular groove

[0036] 113-Air intake grille

[0037] 12-Drive device

[0038] 121-motor, 122-motor cover

[0039] 13-Heating components

[0040] 131-heating bracket, 132-heating element

[0041] 14- Wind blade

[0042] 15- Windshield

[0043] 151-rotating shaft, 152-limiting shaft

[0044] 16-front support plate, 17-rear support plate

[0045] 18-swing ring, 181-toggle handle

[0046] 19-front net, 191-front net annulus.

[0047] 2- Base.

[0048] a-positioning hole, b-limiting long hole, c-radial air inlet gap, d-swing limit hole

[0049] e-Axial ventilation duct. DETAILED DESCRIPTION

[0050] 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.

[0051] like Figure 1 , Figure 2 and Figure 3As shown, a cooling and heating circulation fan with variable air duct of the present invention comprises a rear mesh cover 11, a driving device 12, a heating component 13 and a fan blade 14. The driving device 12 and the heating component 13 are arranged in the rear mesh cover 11. The rotating shaft of the driving device 12 passes through the heating component 13 and is connected to the fan blade 14. A radial air inlet channel 111 is further provided on the rear mesh cover 11 between the fan blade 14 and the heating component 13. A closed annular air duct 112 is formed at the front end of the rear mesh cover 11. The closed annular air duct 11 2 is connected to the radial air inlet channel 111, and a plurality of wind shields 15 are arranged in parallel with the axial direction of the fan blades 14 at the radial air inlet channel 111. The two ends of the wind shield 15 are respectively provided with a rotating shaft 151 and a limiting shaft 152 extending along the length direction thereof. The two ends of the radial air inlet channel 111 are respectively provided with a front support plate 16 and a rear support plate 17. A plurality of positioning holes a and limiting long holes b are respectively arranged in a one-to-one correspondence in the axial direction along the circumferential direction of the front support plate 16 and the rear support plate 17, such as Figure 4 and Figure 5 As shown, the rotating shaft 151 and the limiting shaft 152 at both ends of the wind shield 15 are respectively placed in the positioning hole a and the limiting long hole b corresponding to the front support plate 16 and the rear support plate 17, and the wind shield 15 takes the center of the positioning hole a as the axis, and the limiting shaft 152 rotates along the limiting long hole b; the width dimension of the wind shield 15 is greater than or equal to the width dimension of the radial air inlet gap c formed between two adjacent wind shields 15, and when the wind shield 15 rotates to its lower end along the limiting long hole, the radial air inlet gap c formed in the ring is covered to prevent radial air from entering, as shown in FIG. Figure 2 As shown, of course, when the limit shaft 152 of the wind shield rotates to the upper end of the limit long hole b, the wind shield 15 is arranged along the radial direction, and the radial air inlet gap c is connected to the outside at this time, and the radial air inlet channel 111 is opened, as shown in FIG. Figure 1 By controlling the rotation position of the wind shield 15, the radial air inlet volume of the radial air inlet channel 111 can be controlled. Figure 3 As shown, the driving device 12 and the shaft, the front net 19, the rear net cover 11, and the fan blades 14 in the present invention are arranged on a central axis, especially the rear net cover 11 and the heating bracket 131, and the closed annular air duct 12 are arranged on a central axis.

[0052] The rear mesh cover 11 used in the present invention is grid-shaped except for the closed annular air duct 112. The driving device 12 is installed at the bottom of the inner cavity of the rear mesh cover 11, and includes a motor 121 and a motor cover 122. The motor cover 122 covers the motor 121 and is fixed to the rear mesh cover 11.

[0053] The present invention arranges the radial air inlet channel 111 on the rear mesh cover 11 in a 360-degree surrounding manner, which is composed of a plurality of rows of spacers 1111 axially arranged on the rear mesh cover 11. Figure 5It can be clearly seen that a radial air inlet gap c is formed between two adjacent partition bars 1111, and the radial air inlet channel will form multiple radial air inlet gaps in the circumferential direction of the entire rear air hood, ensuring that there is sufficient radial air inlet volume when cold air is needed.

[0054] from Figure 5 It can be seen that the positioning holes a and the partition bars 1111 provided on the front support plate 16 and the rear support plate 17 are provided on the same radial direction of the rear mesh cover 11, that is, each positioning hole a on the front support plate 16 and the rear support plate 17 is provided above each partition bar, and the radial air inlet gap c formed when two adjacent windshields 15 are opened corresponds to the radial air inlet gap c formed between two adjacent partition bars 1111. The limiting shafts at both ends of the windshield swing in the limiting long holes, and when the radial air inlet gap c is opened, the outside air directly enters the gap between the two partition bars from the gap between the two windshields, and the two radial air inlet gaps c are provided in a straight-through manner. Of course, the gap between the two partition bars and the gap formed between the two windshields in the open state can also be provided in a non-straight-through manner, and the radial air inlet channel can also adopt the structure of a ventilation hole instead of a partition bar, which will not be described in detail here.

[0055] Of course, for the multiple partitions in the circumferential direction of the radial air inlet channel, it is preferred to be arranged at equal intervals, but of course, unequal intervals can also be used. Figure 4 As shown, the front support plate 16 and the rear support plate 17 are vertically arranged on the outer side of the rear mesh cover 11, which is the preferred solution adopted by the present invention, wherein the axial spacing between the front support plate 16 and the rear support plate 17 is greater than or equal to the axial dimension of the radial air inlet channel 111, so that whether the multiple radial air inlet gaps formed on the entire radial air inlet channel 111 are ventilated with the outside world will be completely controlled by the multiple wind shields located between the front support plate and the rear support plate.

[0056] In order to facilitate synchronous control of multiple windshield plates 15 and realize uniform synchronous air intake in the circumferential direction, a swing ring 18 is further provided on the closed annular air duct 112 located outside the front support plate 16, and a plurality of swing limit holes d corresponding to the positions of the limit long holes b are provided along the circumferential direction of the swing ring 18, such as Figure 5 As shown. The limiting shaft 152 at one end of the wind shield 15 passes through the limiting long hole b on the front support plate 16 and the swing limiting hole d on the swing ring 18 in sequence. The structure of the wind shield 15 is a rectangular plate, and a rotating shaft and a limiting shaft are respectively arranged at both ends of the rectangular plate. The limiting shaft 152 is located above the rotating shaft 151. The rotating shaft 151 and the limiting shaft 152 at the other end of the wind shield 15 are placed in the positioning hole a and the limiting long hole b of the rear support plate 17. The positioning hole a and the limiting long hole b on the front support plate 16 are exactly the same as the positioning hole a and the limiting long hole b on the rear support plate 17.

[0057] The swing ring 18 is an annular sheet component, which also has swing limit holes d corresponding to the number and corresponding positions of the limit long holes b; the number of swing limit holes d depends on the number of swing trajectory lines, and the present invention does not specifically limit it.

[0058] In order to assist in moving the swing ring 18, Figure 5 As shown, the present invention also provides a toggle handle 181 on the swing ring 18. Of course, an automatic toggle mode can also be used, which requires the swing ring to synchronously drive the wind shield to swing, so as to close and open the radial air inlet channel. The most basic automatic driving mode can be composed of a transmission structure and a motor drive, such as driving the swing ring 18 to rotate left and right through an electric push rod. It will not be described in detail here, but only as another embodiment of its driving mode.

[0059] like Figure 4 As shown, an annular groove 1121 is further provided on the outer circumferential surface of the closed annular air duct 112, and the swing ring 18 is rotatably arranged in the annular groove 1121, and the rotation direction of the swing limit hole d on the swing ring 18 is opposite to the rotation direction of the limit long hole b on the front support plate 16, which is more helpful for positioning the wind shield, as shown in FIG. Figure 5 As shown in the split diagram.

[0060] Of course, the swing ring 18 arranged on the outer circumferential surface of the closed annular air duct 112 can be divided into multiple sections, and each section of the swing ring 18 can independently control the swing angle of the corresponding multiple wind shields. That is, each swing ring 18 can control a group of multiple wind shields 15, and multiple swing rings 18 can independently adjust the angles of multiple groups of wind shields 15 asynchronously, so as to achieve synchronous or asynchronous air intake in the upper, lower, left or right directions of the circulating fan, and provide a better experience.

[0061] like Figure 3 As shown, the heating component 13 includes a heating bracket 131 and a heating element 132. A circumferentially closed axial ventilation passage e is formed in the heating bracket 131. The heating element 132 is fixed in the axial ventilation passage e of the heating bracket 131, and the heating bracket 131 is detachably fixedly connected with the rear mesh cover 11, so that the wind generated by the fan blade 14 enters the closed annular air passage 112 through the axial ventilation passage e and the heating element 132 and is discharged. The axial ventilation passage e is preferably a conical air passage, and the ventilation cross-sectional size of the axial ventilation passage e gradually decreases in the direction toward the fan blade 14. The shaft of the motor 121 passes through the motor cover 122, the heating element 132, and the heating bracket 131 in sequence, and the fan blade 14 is fixed to the shaft end of the motor 121.

[0062] A front net 19 is also provided at the front end of the closed annular channel 122, which has the functions of safety protection and air outlet. Figure 3 and Figure 4As shown, the front net annular surface 191 of the front net 19 extends into the closed annular air duct 112 and forms a detachable fixed connection with the inner side of the closed annular air duct 112. The radial wind and axial wind formed enter the front net annular surface 191 and are discharged from the front net 19. Figure 1 As shown, the outer side surface of the rear mesh cover 11 is rotatably connected to the base 2, so that the blowing angle thereof can be adjusted. The structure of the base 2 will not be described here in detail, as it is a prior art.

[0063] like Figure 8 As shown, when warm air is needed, the swing ring 18 is manually moved along the circumference, and the swing ring 18 drives the wind shield plate group to swing, closing the radial air inlet channel 111, as shown in FIG. Figure 2 As shown, the air inlet channel and the air inlet volume can be reduced; only axial air inlet can make the wind coming out of the front net 19 warmer and make the warm air more uniform.

[0064] like Figure 7 As shown, when cold air is needed, the swing ring 18 is manually turned in the reverse direction of the circumference, and the swing ring 18 drives the wind shield plate group to swing, and the radial air inlet channel 111 is opened, as shown in FIG. Figure 1 As shown, radial and axial two-way air intake can increase the air intake channel and air intake volume, making the air volume out of the front net 19 larger and cooler.

[0065] As described above, the process of opening and closing the radial air inlet channel 111 are the two most basic states of the implementation of the present invention. It is also possible to implement the two states between the two states, that is, divide the wind shield group into several partitions, and simultaneously divide the swing ring 18 into several corresponding components, so as to achieve the above-mentioned closing and opening of the radial air inlet channel, and at the same time, the state of adjusting the radial air inlet size can be arbitrarily selected in real time; the size of the opening and closing depends on the actual needs of the product design; the manual and automatic opening and closing methods also depend on the positioning of the product, which is not limited or summarized in the present invention.

[0066] Each windshield 15 used in the present invention can swing, and each has the function of sequentially covering the radial air inlet gap c. The size and area of ​​each windshield 15 among the plurality of windshields are equal to the radial air inlet channel 111, that is, the size and area of ​​the radial air inlet gap; and each windshield can swing flexibly, and when the windshield is flexibly connected by a swing ring, all windshields connected to the same swing ring can swing synchronously, which is convenient to operate and simple in structure.

[0067] The present invention adopts a cold and warm circulation fan structure with a variable air duct. In a circle of the circulation fan close to the fan blades, that is, the radial air inlet channel, an equal number of swingable wind shields are set according to the number of air inlet channel partitions. The radial air inlet channel is opened and closed, and can be used to switch between cold air and warm air. The wind shields are used to adjust the air intake volume, which improves the phenomenon of cold air mixed in with warm air, significantly improves the user's physical sensation, and improves the user experience and product performance as a whole.

[0068] 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 cooling and heating circulation fan with a variable air duct, comprising a rear mesh cover (11), a driving device (12), a heating component (13) and a fan blade (14), wherein the driving device (12) and the heating component (13) are arranged in the rear mesh cover (11), and the rotating shaft of the driving device (12) passes through the heating component (13) and is connected to the fan blade (14); a radial air inlet channel (111) is also provided on the rear mesh cover (11) between the fan blade (14) and the heating component (13), and a closed annular air duct (112) is formed at the front end of the rear mesh cover (11), and the closed annular air duct (112) is connected to the radial air inlet channel (111), characterized in that: The radial air inlet passage (111) is also provided with a plurality of wind shields (15) arranged in parallel with the axial direction of the fan blades (14); the two ends of the wind shields (15) are respectively provided with a rotating shaft (151) and a limiting shaft (152) extending along the length direction thereof; the two ends of the radial air inlet passage (111) are respectively provided with a front support plate (16) and a rear support plate (17); and a plurality of positioning holes (a) and limiting holes (152) arranged in a one-to-one correspondence in the axial direction are respectively provided along the circumferential direction of the front support plate (16) and the rear support plate (17). The wind shield (15) is provided with a positioning hole (b), a rotating shaft (151) and a limiting shaft (152) at both ends of the wind shield (15) are respectively placed in the positioning hole (a) and the limiting long hole (b) corresponding to the front support plate (16) and the rear support plate (17), and the wind shield (15) takes the center of the positioning hole (a) as the axis, and the limiting shaft (152) rotates along the limiting long hole (b); the width dimension of the wind shield (15) is greater than or equal to the width dimension of the radial air inlet gap (c) formed between two adjacent wind shields (15).

2. A cooling and heating circulation fan with variable air duct according to claim 1, characterized in that: The radial air inlet channel (111) is arranged on the rear mesh cover (11) in a 360-degree circumferential manner, and is composed of a plurality of rows of spacers (1111) axially arranged on the rear mesh cover (11), with radial air inlet gaps (c) formed between two adjacent spacers (1111).

3. A cooling and heating circulation fan with variable air duct according to claim 2, characterized in that: The positioning holes (a) on the front support plate (16) and the rear support plate (17) are arranged correspondingly to the partition bars (1111) in the same radial direction of the rear mesh cover (11); and the radial air inlet gap (c) formed when two adjacent wind shields (15) are opened corresponds one to one to the radial air inlet gap (c) formed between two adjacent partition bars (1111).

4. A cooling and heating circulation fan with variable air duct according to claim 3, characterized in that: The partition bars (1111) are arranged at equal intervals along the circumferential direction of the radial air inlet channel (111).

5. A cooling and heating circulation fan with variable air duct according to any one of claims 1 to 4, characterized in that: The front support plate (16) and the rear support plate (17) are vertically arranged on the outer side surface of the rear mesh cover (11), and the axial spacing between the front support plate (16) and the rear support plate (17) is greater than or equal to the axial dimension of the radial air inlet channel (111).

6. A cooling and heating circulation fan with variable air duct according to claim 5, characterized in that: A swing ring (18) is also provided on the closed annular air duct (112) located outside the front support plate (16), and a plurality of swing limit holes (d) corresponding to the positions of the limit long holes (b) are provided along the circumferential direction of the swing ring (18), and a limit shaft (152) at one end of the wind shield (15) passes through the limit long hole (b) on the front support plate (16) and the swing limit hole (d) on the swing ring (18) in sequence.

7. A cooling and heating circulation fan with variable air duct according to claim 6, characterized in that: The swing ring (18) provided along the outer circumferential surface of the closed annular air duct (112) is divided into a plurality of swing ring sections, and each swing ring section independently controls the swing angle of the wind shield (15) in the corresponding area.

8. The cooling and heating circulation fan with variable air duct according to claim 7, characterized in that: An annular groove (1121) is also provided on the outer circumferential surface of the closed annular air duct (112), the swing ring (18) is rotatably arranged in the annular groove (1121), and the rotation direction of the swing limit hole (d) on the swing ring (18) is opposite to the rotation direction of the limit long hole (b) on the front support plate (16).

9. The cooling and heating circulation fan with variable air duct according to claim 1, characterized in that: The heating component (13) comprises a heating bracket (131) and a heating element (132); a circumferentially closed axial ventilation duct (e) is formed in the heating bracket (131); the heating element (132) is fixed in the axial ventilation duct (e) of the heating bracket (131); and the heating bracket (131) and the rear mesh cover (11) are detachably fixedly connected, so that the axial wind generated by the rotation of the fan blade (14) enters the closed annular air duct (112) through the axial ventilation duct (e) and the heating element (132) in sequence and is discharged.

10. A cooling and heating circulation fan with variable air duct according to claim 9, characterized in that: The axial ventilation passage (e) is a conical air passage, and the ventilation cross-sectional dimensions of the axial ventilation passage (e) gradually decrease in the direction toward the fan blade (14).

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