Heat dissipation mechanism, electric energy quality detection device formed by heat dissipation mechanism and heat dissipation method

Abstract

The invention relates to a heat dissipation mechanism, an electric energy quality detection device formed by the heat dissipation mechanism and a heat dissipation method, the heat dissipation mechanism comprises a heat dissipation hole formed in a shell, the heat dissipation hole is sequentially provided with a filter screen A and a heat dissipation fan A, and the shell is provided with a driving mechanism for driving the heat dissipation fan A to rotate; the cooling fan A comprises a hub A rotationally arranged on the shell, a plurality of fan blades A and fan blades B which are arranged in the circumferential direction of the hub A are arranged on the hub A, and the inclination directions of the fan blades A and the fan blades B are opposite; the driving mechanism drives the wheel hub A to rotate, the wheel hub A drives the fan blade A and the fan blade B to rotate synchronously, the fan blade A and the fan blade B form two streams of air flows which flow reversely and rotate around the wheel hub A, the air flows inside and outside the shell circularly flow, heat dissipation of the electric energy quality detection device is completed, meanwhile, the filter screen A is sequentially subjected to reverse blowing, and the air flow is discharged. Impurities such as dust attached to the surface of the filter screen A are automatically cleaned.

Description

Technical Field

[0001] This invention relates to the field of power quality testing equipment technology, and in particular to a heat dissipation mechanism and power quality testing device and heat dissipation method. Background Technology

[0002] A power quality testing device is a portable instrument used to monitor the power quality of a power system. It primarily measures and analyzes parameters such as voltage deviation, frequency fluctuation, harmonic distortion, and three-phase imbalance to ensure a safe and reliable power supply. Its applications cover areas such as grid load fluctuation monitoring, power equipment commissioning, fault diagnosis, and reactive power compensation device evaluation, and it is suitable for monitoring in power transmission and distribution, power electronics, and industrial scenarios.

[0003] Prior art application number 202321612325.6 discloses a power quality detection device. The power quality detection device includes: a power quality detection device body; two protective shells, each fixedly installed on both sides of the power quality detection device body; and two heat dissipation components, each disposed within one of the two protective shells. The heat dissipation components assist in heat dissipation from the power quality detection device body. Each heat dissipation component includes a protective shell, a motor, a movable cover, and two fan blades. The protective shell is fixedly installed within either of the protective shells, and the motor is fixedly installed within the protective shell. The output shaft of the motor is rotatably connected to the protective shell. The power quality detection device provided by this utility model has the advantage of ensuring effective heat dissipation to prevent electrical hazards.

[0004] However, the above technical solutions have some problems: the airflow generated by the fan rotation will carry dust and other impurities in the air toward the dustproof mesh plate. The dust and other impurities gradually adhere to the surface of the dustproof mesh plate. As the working time increases, the ventilation effect of the dustproof mesh plate decreases, and the heat generated inside the power quality detection device is difficult to dissipate, causing the internal temperature of the detection device to gradually rise, which in turn affects the stability of the power quality detection device. Therefore, a heat dissipation mechanism that can dissipate heat and automatically remove impurities from the surface of the dustproof mesh plate and a power quality detection device thereof are needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a heat dissipation mechanism and a power quality detection device and heat dissipation method. The drive mechanism drives the hub A to rotate, and the hub A drives the fan blades A and B to rotate synchronously. The fan blades A and B form two opposing airflows that rotate around the hub A. The airflow inside and outside the housing circulates and completes the heat dissipation of the power quality detection device. At the same time, the filter screen A is back-blown in sequence to automatically clean the dust and other impurities attached to the surface of the filter screen A.

[0006] This invention is achieved through the following technical solution: a heat dissipation mechanism is provided, including heat dissipation holes formed on a housing, with a filter A and a cooling fan A arranged sequentially in the heat dissipation holes, and a drive mechanism for driving the cooling fan A to rotate on the housing; the cooling fan A includes a hub A rotatably mounted on the housing, with a plurality of fan blades A and B arranged circumferentially on the hub A, and the fan blades A and B having opposite inclination directions; the drive mechanism drives the hub A to rotate, and the hub A drives the fan blades A and B to rotate synchronously, the fan blades A draws airflow from outside the housing into the housing, and the fan blades B draw airflow from inside the housing into the housing, the airflow inside and outside the housing circulates and completes the heat dissipation of the power quality detection device, while simultaneously backflushing the filter A to automatically clean dust and other impurities adhering to the surface of the filter A. As an optimization, the housing is a cylindrical structure with heat dissipation holes located on the side of the housing and arranged circumferentially. The axis of hub A is the same as the axis of the housing. Fan blades A and B extend axially along the housing and are arranged circumferentially. Fan blade A rotates around the equipment inside the housing and drives the airflow 360° to cool the equipment inside the housing, increasing the heat dissipation effect. Fan blade B drives the airflow to rotate 360° and sequentially backflush the filter A. At the same time, fan blades A and B form an airflow that penetrates the middle part of the housing, increasing the heat dissipation effect.

[0007] As an optimization, an air outlet is provided on the bottom surface of the casing, with hub A located at the air outlet. Several fan blades C are arranged circumferentially on hub A, and fan blades A and B are fixed to fan blades C. The heat dissipation hole is similar to an air inlet. Hub A drives fan blades A, B, and C to rotate synchronously, and convection heat dissipation is completed by a cooling fan A, which simplifies the heat dissipation structure and reduces heat dissipation costs.

[0008] As an optimization, a cooling fan B is provided on the outside of the housing, and the cooling fan B is connected to the drive mechanism; the cooling fan B accelerates the airflow outside the housing, reducing the heat that is discharged from the housing and then returns to the housing.

[0009] As an optimization, the cooling fan B includes a hub B that is coaxially fixed to the hub A. The hub B is provided with several fan blades D arranged circumferentially along the hub B, and the diameter of the fan blades D is larger than the outer diameter of the housing. The hub B drives the fan blades D to rotate, and the fan blades D simultaneously drive the airflow on the side of the housing, accelerating the air circulation on the side of the housing and preventing the hot air discharged by the fan blades B from being re-drawn into the housing by the fan blades A.

[0010] As an optimization, a dust cover extending along the axial direction of the housing is provided on the top of the housing, and the distance between the two sides of the dust cover is greater than or equal to the diameter of the housing; the dust cover prevents dust and other impurities from accumulating on the top of the housing, thereby improving heat dissipation efficiency.

[0011] As an optimization, the dust cover is fitted onto the housing, forming an airflow channel between the dust cover and the housing, and the dust cover has an air inlet and an air outlet at both ends; through the airflow channel and the cooling fan B, a directional airflow is formed on the outside of the housing to prevent the hot air discharged from the housing from being re-drawn into the housing.

[0012] The present invention also includes a power quality detection device, comprising a housing, an opening at one end of the housing, a cover at the opening, a bracket fixed on the cover, the bracket being located inside the housing, and a working module mounted on the bracket; it also includes a heat dissipation mechanism, which is sleeved on the bracket; the heat dissipation mechanism dissipates heat around the working module to increase the heat dissipation effect.

[0013] As an optimization, several ventilation holes are provided on the bracket; airflow passes through the bracket, increasing the smoothness of airflow and increasing the contact area between the airflow and the working module, thereby improving the heat dissipation effect.

[0014] A heat dissipation method for a power quality detection device includes the following steps: a. Install the working module on the bracket, fix the cover and the shell together, and place the working module inside the shell through the cover and the bracket; b. Start the drive mechanism. Cooling fan A and cooling fan B start. Hub A drives fan blades A, B and C to rotate. Hub B drives fan blade D to rotate. c. Fan blade D drives the airflow in the airflow channel to flow in a specific direction, and cold air enters the airflow channel through the air inlet; d. Fan blade A drives the cold air in the airflow channel through the heat dissipation holes into the housing. The cold air rotates 360° and cools down the working modules on the bracket in sequence. e. Driven by fan blades A and B, cold air passes through the ventilation holes and penetrates the bracket. The cold air exchanges heat with the working module and is converted into hot air. f. Fan blade B drives the hot air inside the housing through the heat dissipation holes into the airflow channel. The hot air rotates 360° and blows back onto filter A in sequence. g. Fan blade C drives the hot air inside the casing to be discharged through the air outlet; h. Hot air discharged from the air outlet and heat dissipation holes is discharged through the exhaust port.

[0015] The beneficial effects of this invention are as follows: the drive mechanism drives the hub A to rotate, the hub A drives the fan blades A and B to rotate synchronously, the fan blade A drives the airflow outside the housing into the housing, the fan blade B drives the airflow inside the housing into the housing, the airflow inside and outside the housing circulates and completes the heat dissipation of the power quality detection device, and at the same time, it sequentially backflushs the filter screen A, automatically cleaning the dust and other impurities attached to the surface of the filter screen A.

[0016] Fan blade A rotates around the equipment inside the housing and drives the airflow 360° to cool the equipment inside the housing, increasing the heat dissipation effect. Fan blade B drives the airflow to rotate 360° and blows back the filter screen A in sequence. At the same time, fan blades A and B form an airflow that runs through the middle of the housing, increasing the heat dissipation effect.

[0017] The heat dissipation holes are similar to air inlets. The hub A drives the fan blades A, B, and C to rotate synchronously, and a cooling fan A completes the convection cooling. This simplifies the heat dissipation structure and reduces the cost of heat dissipation.

[0018] An airflow channel is formed between the dust cover and the housing. The cooling fan B forms a directional airflow on the outside of the housing through the airflow channel, preventing the hot air discharged from the housing from being re-drawn into the housing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 2 The figure shows a schematic diagram of the cooling fan A and cooling fan B of this invention; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a schematic diagram of the internal airflow of the present invention; Figure 5 This is a schematic diagram of the internal airflow from the main view angle of the present invention; Figure 6 Schematic diagram of the connection between the bracket and the working module of this invention; As shown in the figure: 1. Housing, 2. Filter A, 3. Cooling Fan A, 4. Drive Mechanism, 5. Cooling Fan B, 6. Filter B, 7. Dust Cover, 8. Cover, 9. Bracket, 10. Working Module, 301. Hub A, 302. Fan Blade A, 303. Fan Blade B, 304. Fan Blade C, 305. Limiting Ring A, 306. Limiting Ring B, 501. Hub B, 502. Fan Blade D, 701. Air Inlet, 702. Air Outlet. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0021] like Figure 1 , Figure 2 , Figure 4 and Figure 5The heat dissipation mechanism of the present invention includes heat dissipation holes formed on the housing 1, with a filter A2 and a cooling fan A3 arranged sequentially in the heat dissipation holes. The housing 1 is provided with a drive mechanism 4 for driving the cooling fan A3 to rotate. The cooling fan A3 is characterized in that: the cooling fan A3 includes a hub A301 rotatably mounted on the housing 1, and the hub A301 is provided with a plurality of fan blades A302 and fan blades B303 arranged circumferentially along the hub A301, and the fan blades A302 and fan blades B303 are inclined in opposite directions; the filter A2 and the drive mechanism 4 are prior art, and the filter A2 covers the heat dissipation holes; the fan blades A302 and fan blades B303 are arranged evenly in sequence around the hub A301.

[0022] Start the drive mechanism 4, which drives the hub A301 to rotate. The hub A301 drives the fan blades A302 and B303 to rotate synchronously. The fan blades A302 drive the cold air outside the housing 1 to pass through the heat dissipation holes and the filter A2 in sequence and enter the housing 1. The cold air completes heat exchange inside the housing 1 and becomes hot air. The fan blades B303 drive the hot air inside the housing 1 to pass through the filter A2 and the heat dissipation holes in sequence and enter the outside of the housing 1. The airflow inside and outside the housing 1 circulates and continuously carries away the heat inside the housing 1. The power quality detection device completes the heat dissipation.

[0023] Dust and other impurities in the cold air driven by fan blade A302 adhere to the outside of filter screen A2. The hot air driven by fan blade B303 blows back onto filter screen A2. The cold air and hot air rotate around hub A301. The hot air blows back onto the outside of filter screen A2 after the cold air has passed, and the dust and other impurities are removed from filter screen A2.

[0024] like Figure 1 , Figure 2 , Figure 4 and Figure 5 The housing 1 shown is a cylindrical structure. The heat dissipation holes are located on the side of the housing 1 and are arranged around the circumference of the housing 1. The axis of the hub A301 is the same as the axis of the housing 1. The fan blades A302 and B303 extend along the axial direction of the housing 1 and are arranged around the circumference of the housing 1. The filter screen A2 extends along the direction of the heat dissipation holes. The fan blades A302 and B303 are arranged radially inclined along the housing 1, and the inclination directions of the fan blades A302 and B303 are opposite.

[0025] Fan blades A302 and B303 rotate around the circumference of housing 1. Fan blade A302 rotates around the middle part of housing 1 and blows cold air toward the middle part of housing 1 in sequence. Fan blade B303 rotates around the middle part of housing 1 and sucks away the hot air in the middle part of housing 1 in sequence. The cold air driven by fan blade A302 passes through the middle part of housing 1, becomes hot air, and is discharged through fan blade B303. The hot air blows back onto the outside of filter A2, which has been blown by the cold air.

[0026] like Figure 1 , Figure 2 and Figure 4 The bottom surface of the housing 1 shown has an air outlet. A hub A301 is located at the air outlet, and several fan blades C304 are arranged circumferentially around the hub A301. Fan blades A302 and B303 are fixedly connected to the fan blades C304. The fan blades C304 extend radially along the hub A301 and are evenly arranged around the hub A301. A limiting ring A305 is fixedly provided at the end of the fan blades C304 away from the hub A301. The limiting ring A305 is rotatably mounted on the housing 1, and the fan blades A302 and B303 are... B303 is fixed on the limiting ring A305; the end of fan blade A302 and fan blade B303 away from the limiting ring A305 is fixed with a limiting ring B306, the limiting ring B306 is mounted on the housing 1, and the heat dissipation hole is located between the limiting ring A305 and the limiting ring B306; the number of fan blades A302 is greater than the number of fan blades B303, the heat dissipation hole is similar to an air inlet, the main function of fan blade B303 is to backflush filter A2, and filter B6 is provided between fan blade C304 and housing 1, and filter B6 covers the air outlet.

[0027] The hub A301 drives the fan blades A302, B303 and C304 to rotate synchronously. The fan blade C304 drives the hot air inside the housing 1 to pass through the filter screen B6 and the air outlet in sequence and enter the outside of the housing 1.

[0028] like Figures 1-4 A cooling fan B5 is provided on the outside of the housing 1 shown, and the cooling fan B5 is connected to the drive mechanism 4.

[0029] Start the drive mechanism 4, and the cooling fan B5 starts and drives the airflow outside the housing 1.

[0030] like Figures 1-4 The cooling fan B5 shown includes a hub B501 that is coaxially fixed to a hub A301. The hub B501 is provided with a plurality of fan blades D502 arranged circumferentially around the hub B501, and the diameter of the fan blades D502 is larger than the outer diameter of the housing 1. The fan blades D502 extend radially along the hub B501 and are evenly arranged around the hub B501.

[0031] Start drive mechanism 4, start cooling fans A3 and B5, hub A301 drives fan blades A302, B303 and C304 to rotate, hub B501 drives fan blade D502 to rotate; fan blade D502 drives the airflow outside housing 1.

[0032] like Figure 3 and Figure 5 A dust cover 7 extending along the axial direction of the housing 1 is provided directly above the housing 1, and the distance between the two sides of the dust cover 7 is greater than or equal to the diameter of the housing 1.

[0033] Dust and other impurities fall onto the dust cover 7 under the influence of gravity.

[0034] like Figure 1 , Figure 3 , Figure 4 and Figure 5 The dust cover 7 shown is fitted onto the housing 1, and an airflow channel is formed between the dust cover 7 and the housing 1. The dust cover 7 has an air inlet 701 and an air outlet 702 at its two ends, respectively.

[0035] When the cooling fan B5 starts, the hub B501 drives the fan blades D502 to rotate, and a directional airflow is formed between the dust cover 7 and the housing 1. The cold air outside the dust cover 7 enters the airflow channel through the air inlet 701, and the hot air discharged from the air outlet and heat dissipation holes is discharged through the exhaust port 702.

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The power quality detection device of the present invention includes a housing 1, an opening at one end of the housing 1, a cover 8 at the opening, a bracket 9 fixed on the cover 8, the bracket 9 being located inside the housing 1, and a working module 10 being provided on the bracket 9; it also includes a heat dissipation mechanism, which is sleeved on the bracket 9; the opening is located at the end of the housing 1 away from the cooling fan B5, the bracket 9 extends axially along the housing 1, and fan blades A302 and B303 are arranged around the bracket 9; the working module 10 is prior art.

[0037] The fan blade A302 drives the cold air in the airflow channel through the heat dissipation hole into the housing 1. The cold air rotates 360° and cools down the working module 10 on the bracket 9 in sequence.

[0038] like Figure 4 and Figure 6 The bracket 9 shown has several ventilation holes; the ventilation holes are arranged evenly along the axial direction of the bracket 9.

[0039] Driven by fan blades A302 and B303, cold air passes through the ventilation holes and penetrates the bracket 9. The cold air exchanges heat with the working module 10 and is converted into hot air.

[0040] A heat dissipation method for a power quality detection device includes the following steps: a. Install the working module 10 on the bracket 9, fix the cover 8 and the housing 1 together, and place the working module 10 inside the housing 1 through the bracket 9 via the cover 8; b. Start drive mechanism 4, start cooling fan A3 and cooling fan B5, hub A301 drives fan blades A302, B303 and C304 to rotate, hub B501 drives fan blade D502 to rotate. c. Fan blade D502 drives the airflow in the airflow channel to flow in a specific direction, and cold air enters the airflow channel through air inlet 701; d. The fan blade A302 drives the cold air in the airflow channel through the heat dissipation hole into the housing 1. The cold air rotates 360° and cools down the working module 10 on the bracket 9 in sequence. e. Driven by fan blades A302 and B303, cold air passes through the ventilation holes and penetrates the bracket 9. The cold air exchanges heat with the working module 10 and is converted into hot air. f. The fan blade B303 drives the hot air inside the housing 1 through the heat dissipation holes into the airflow channel. The hot air rotates 360° and blows back the filter A2 in sequence. g. The fan blades C304 drive the hot air inside the housing 1 to be discharged through the air outlet; h. Hot air discharged from the air outlet and heat dissipation hole is discharged through the exhaust port 702.

[0041] In actual use, the working module 10 is installed on the bracket 9, and the cover 8 and the housing 1 are fixed together. The working module 10 is placed inside the housing 1 through the bracket 9 via the cover 8. The drive mechanism 4 is started, and the drive mechanism 4 drives the hub A301 and hub B501 to rotate. The hub A301 drives the fan blades A302, B303 and C304 to rotate, and the hub B501 drives the fan blade D502 to rotate. Under the action of the fan blade D502, a directional airflow channel is formed between the dust cover 7 and the housing 1. The cold air outside the dust cover 7 enters the airflow channel through the air inlet 701 and flows toward the exhaust outlet 702.

[0042] Fan blades A302 and B303 rotate around the support 9 and the working module 10 inside the housing 1. Fan blade A302 drives the cold air in the airflow channel to pass through the heat dissipation holes and filter A2 in sequence and enter the housing 1. Dust and other impurities in the cold air adhere to the outside of filter A2. The cold air rotates 360° and cools the working module 10 on the support 9 in sequence. The cold air passes through the ventilation holes and passes through the support 9. The cold air and the working module 10 exchange heat and are converted into hot air. Fan blade B303 sucks away the hot air in the housing 1 in sequence. Under the action of fan blade B303, the hot air passes through filter A2 and heat dissipation holes in sequence and enters the airflow channel, and blows back the filter A2. The cold air and hot air rotate around the hub A301. The hot air blows back the outside of filter A2 that the cold air has blown over, and dust and other impurities are removed from filter A2. The airflow inside and outside the housing 1 circulates and continuously transports the heat emitted by the working module 10 to the airflow channel.

[0043] The fan blades C304 rotate synchronously and drive the hot air inside the housing 1 to pass through the filter screen B6 and the air outlet in sequence and enter the airflow channel.

[0044] When the fan blades D502 rotate, the hot air discharged from the air outlet and heat dissipation holes is discharged through the exhaust port 702.

[0045] Start the drive mechanism 4, and the cooling fan B5 starts and drives the airflow outside the housing 1.

[0046] Dust and other impurities in the air fall to the top of the dust cover 7 under the influence of gravity.

[0047] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A heat dissipation mechanism, comprising heat dissipation holes formed on a housing (1), wherein a filter A (2) and a cooling fan A (3) are sequentially arranged in the heat dissipation holes, and a drive mechanism (4) for driving the cooling fan A (3) to rotate is provided on the housing (1); characterized in that: The cooling fan A (3) includes a hub A (301) mounted on the housing (1). The hub A (301) is provided with a plurality of fan blades A (302) and fan blades B (303) arranged around the hub A (301), and the fan blades A (302) and fan blades B (303) are tilted in opposite directions.

2. The heat dissipation mechanism according to claim 1, characterized in that: The housing (1) is a cylindrical structure. The heat dissipation holes are located on the side of the housing (1) and arranged around the circumference of the housing (1). The axis of the hub A (301) is the same as the axis of the housing (1). The fan blades A (302) and B (303) extend along the axial direction of the housing (1) and are arranged around the circumference of the housing (1).

3. The heat dissipation mechanism according to claim 2, characterized in that: The bottom of the housing (1) is provided with an air outlet, the hub A (301) is located at the air outlet, and the hub A (301) is provided with several fan blades C (304) arranged around the hub A (301). Fan blades A (302) and B (303) are fixed to the fan blades C (304).

4. The heat dissipation mechanism according to claim 3, characterized in that: A cooling fan B (5) is provided on the outside of the housing (1), and the cooling fan B (5) is connected to the drive mechanism (4).

5. The heat dissipation mechanism according to claim 4, characterized in that: The cooling fan B (5) includes a hub B (501) that is coaxially fixed to a hub A (301). The hub B (501) is provided with a number of fan blades D (502) arranged circumferentially along the hub B (501), and the diameter of the fan blades D (502) is greater than the outer diameter of the housing (1).

6. The heat dissipation mechanism according to claim 5, characterized in that: A dust cover (7) is provided directly above the housing (1) and extends along the axial direction of the housing (1), and the distance between the two sides of the dust cover (7) is greater than or equal to the diameter of the housing (1).

7. The heat dissipation mechanism according to claim 6, characterized in that: The dust cover (7) is fitted onto the shell (1), and an airflow channel is formed between the dust cover (7) and the shell (1). The dust cover (7) has an air inlet (701) and an air outlet (702) at both ends.

8. A power quality detection device, characterized in that: It includes a housing (1), one end of which has an opening, and a cover (8) is provided on the opening. A bracket (9) is fixed on the cover (8), and the bracket (9) is located inside the housing (1). A working module (10) is provided on the bracket (9). It also includes a heat dissipation mechanism as described in any one of claims 1-7, which is sleeved on the bracket (9).

9. A power quality detection device according to claim 8, characterized in that: Several ventilation holes are provided on the bracket (9).

10. A heat dissipation method for the power quality detection device as described in claim 9, characterized in that, Includes the following steps: a. Install the working module (10) on the bracket (9), fix the cover (8) and the shell (1) together, and place the working module (10) inside the shell (1) through the bracket (9) via the cover (8); b. Start the drive mechanism (4), start the cooling fan A (3) and cooling fan B (5), drive the fan blades A (301), B (303) and C (304) to rotate, and drive the fan blades D (502) to rotate. c. The fan blade D (502) drives the airflow in the airflow channel to flow in a specific direction, and the cold air enters the airflow channel through the air inlet (701); d. Fan blade A (302) drives the cold air in the airflow channel through the heat dissipation hole into the housing (1). The cold air rotates 360° and cools down the working module (10) on the bracket (9) in sequence. e. Driven by fan blades A (302) and B (303), cold air passes through the ventilation hole and penetrates the bracket (9). The cold air and the working module (10) exchange heat and are converted into hot air. f. The fan blade B (303) drives the hot air inside the housing (1) through the heat dissipation hole into the airflow channel. The hot air rotates 360° and blows back the filter screen A (2) in sequence. g. The fan blade C (304) drives the hot air inside the casing (1) to be discharged through the air outlet; h. Hot air discharged from the air outlet and heat dissipation hole is discharged through the exhaust port (702).

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