CN221081885U - Frequency conversion device, range hood and central purification equipment - Google Patents

Abstract

The utility model provides a frequency conversion device, a range hood and central purification equipment, and relates to the technical field of frequency conversion. The embodiment of the utility model can effectively realize the heat dissipation of the intelligent power module and reduce the resource waste caused by ineffective heat dissipation. The frequency conversion device comprises an intelligent power module, a control module and a heat dissipation module; the control module is respectively and electrically connected with the intelligent power module and the heat dissipation module; the heat dissipation module is arranged on the surface of the intelligent power module, and the intelligent power module is internally provided with a temperature detection unit. And the temperature detection unit is used for detecting the internal temperature of the intelligent power module and transmitting the internal temperature to the control module. And the control module is used for transmitting the electric signal corresponding to the internal temperature to the heat dissipation module. And the heat radiation module is used for radiating the intelligent power module according to the electric signal.

Description

Frequency conversion device, range hood and central purification equipment

Technical Field

The utility model relates to the technical field of frequency conversion, in particular to a frequency conversion device, a range hood and central purification equipment.

Background

A range hood is a kitchen appliance that purifies the kitchen environment. The control system of the range hood is generally installed on a control board in an electrical box, and electronic components in the control board can generate a large amount of heat during working, particularly an intelligent power module (i.e., an IPM module), and the IPM module increases control current and generates heat more seriously along with the increase of the air quantity of the range hood, so that how to ensure effective heat dissipation of the control system becomes a great factor for improving the performance of the range hood.

Disclosure of utility model

The embodiment of the utility model provides a frequency conversion device, a range hood and central purification equipment, which can effectively realize heat dissipation of an intelligent power module and reduce resource waste caused by ineffective heat dissipation.

In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:

In a first aspect, a frequency conversion device is provided, the frequency conversion device includes an intelligent power module, a control module and a heat dissipation module; the control module is respectively and electrically connected with the intelligent power module and the heat dissipation module; the heat dissipation module is arranged on the surface of the intelligent power module, and the intelligent power module is internally provided with a temperature detection unit.

And the temperature detection unit is used for detecting the internal temperature of the intelligent power module and transmitting the internal temperature to the control module.

And the control module is used for transmitting the electric signal corresponding to the internal temperature to the heat dissipation module.

And the heat radiation module is used for radiating the intelligent power module according to the electric signal.

Optionally, the intelligent power module includes at least one pin, and the temperature detection unit is electrically connected with the control module through the at least one pin.

Optionally, the heat dissipation module includes a heat sink; the radiator is arranged on the first surface of the intelligent power module.

Optionally, a bracket is disposed on the first surface of the intelligent power module, and the radiator is fixed on the bracket.

Optionally, the smart power module includes at least one fastening point, and the heat sink is detachably connected to each fastening point on the smart power module.

Optionally, the radiator is detachably connected with each fixing point on the intelligent power module through a flange structure.

Optionally, at least one fixing point is arranged on the radiator, and the fixing points arranged on the radiator are opposite to the fixing points arranged on the intelligent power module in position and consistent in number.

Optionally, the heat dissipation module further includes a heat dissipation fan; the heat radiation fan is arranged on the first surface of the radiator; the first surface of the radiator is a surface which is opposite to and far away from the first surface of the intelligent power module in the radiator, and the air outlet of the cooling fan faces to the first surface of the radiator.

Optionally, the heat dissipating fan is disposed on the second surface of the heat sink; the plane of the second surface of the radiator is intersected with the plane of the first surface of the intelligent power module, and the air outlet of the cooling fan faces to the second surface of the radiator.

Optionally, the frequency conversion device further comprises an electric control box, and the electric control box comprises an air inlet; the heat dissipation module comprises a heat radiator; radiator, intelligent power module and control module set up in the cavity of automatically controlled box, and the radiator sets up on intelligent power module's first surface.

Optionally, the heat dissipation module further includes a heat dissipation fan; the radiator fan is arranged at the air inlet, the air outlet of the radiator fan faces to the first surface of the radiator, and the first surface of the radiator is a surface which is opposite to and far away from the first surface of the intelligent power module in the radiator.

Optionally, the air outlet of the cooling fan faces the second surface of the radiator, and a plane where the second surface of the radiator is located intersects with a plane where the first surface of the intelligent power module is located.

Optionally, the control module is electrically connected with the cooling fan.

Optionally, the cooling fan comprises a plurality of wind power gears when being started, and each wind power gear corresponds to an electric signal and a rotating speed.

The control module is specifically used for determining the wind power gear of the cooling fan according to the internal temperature, generating an electric signal corresponding to the wind power gear and transmitting the electric signal to the cooling fan.

Optionally, each wind power gear corresponds to a temperature interval.

The control module is specifically used for determining a temperature interval in which the internal temperature is located and determining a wind power gear of the cooling fan according to the temperature interval in which the internal temperature is located.

Optionally, the frequency conversion device further comprises a substrate, and the intelligent power module and the control module are arranged on the substrate.

In a second aspect, a range hood is provided, including the frequency conversion device of the first aspect.

In a third aspect, there is also provided a central purifying apparatus comprising the range hood of the second aspect.

The frequency conversion device, the range hood and the central purification equipment are provided with the intelligent power module, the control module and the heat dissipation module; the heat dissipation module is arranged on the surface of the intelligent power module, and the control module is respectively and electrically connected with the intelligent power module and the heat dissipation module. The internal temperature of the intelligent power module is detected by a temperature detection unit built in the intelligent power module. Thereby realizing the real-time monitoring of the internal temperature of the intelligent power module. And then, the detected internal temperature is transmitted to the control module, so that the control module transmits an electric signal corresponding to the internal temperature to the heat radiation module, and the heat radiation module radiates heat to the intelligent power module according to the electric signal. Therefore, the temperature of the intelligent power module is effectively reduced, the problem that the intelligent power module is damaged due to overhigh temperature is avoided, and the service life of the intelligent power module is prolonged; meanwhile, resource waste caused by ineffective heat dissipation can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural diagram of a frequency conversion device according to an embodiment of the present utility model;

FIG. 2 is a second schematic diagram of a frequency conversion device according to an embodiment of the present utility model;

FIG. 3 is a third schematic structural diagram of a frequency conversion device according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a frequency conversion device according to an embodiment of the present utility model;

Fig. 5 is a schematic diagram of a frequency conversion device according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a frequency conversion device according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a frequency conversion device according to an embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described below with reference to the accompanying drawings.

In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion. Furthermore, in the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "plurality" means two or more.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present utility model to describe various thresholds, signals, instructions, etc., these thresholds, signals, and instructions should not be limited by these terms. These terms are only used to distinguish one threshold, signal, or instruction from another. For example, a first threshold may also be referred to as a second threshold, and similarly, a second threshold may also be referred to as a first threshold, etc., without departing from the scope of embodiments of the present utility model.

In addition, the term "and/or" in the present utility model means that either one or both of them may be included.

The following describes the structure of the frequency conversion device provided by the utility model in detail:

In the utility model, the heat conduction mode is generally adopted to radiate the IPM module, the metal radiator is closely attached above the IPM module, and the heat radiation of the radiator is utilized to increase the radiating area of the air, so that the IPM module radiates heat. When the existing heat dissipation mode is dead, the temperature of the IPM module cannot be regulated and controlled in real time.

Therefore, the utility model thinks that a frequency conversion device with a temperature monitoring function can be designed, so that the temperature regulation and control function of the IPM module can be realized.

Based on the above inventive concept, an embodiment of the present utility model provides a frequency conversion device, as shown in fig. 1.

The frequency conversion device 1 comprises an intelligent power module 11, a control module 12 and a heat dissipation module 13; the control module 12 is electrically connected with the intelligent power module 11 and the heat dissipation module 13 respectively; the heat dissipation module 13 is disposed on the surface of the intelligent power module 11, and the intelligent power module 11 has a temperature detection unit 111.

The temperature detecting unit 111 is configured to detect an internal temperature of the intelligent power module 11 and transmit the internal temperature to the control module 12.

The control module 12 is configured to transmit an electrical signal corresponding to the internal temperature to the heat dissipation module 13.

The heat dissipation module 13 is configured to dissipate heat from the intelligent power module 11 according to the electrical signal.

Alternatively, the intelligent power module 11 is an intelligent power (INTELLIGENT POWER MODULE, IPM) module. The control module 12 is a micro-programmed controller (Microprogrammed Control Unit, MCU).

In one possible implementation, the temperature detection unit 111 may also be in wireless communication with the control module 12 (i.e. in a wireless communication manner), where the temperature detection unit 111 transmits the internal temperature of the smart power module 11 to the control module 12 via a wireless signal. Similarly, the control module 12 and the heat dissipation module 13 may also adopt a wireless communication mode, and the control module 12 transmits a control signal corresponding to the internal temperature of the intelligent power module 11 to the heat dissipation module 13; the heat radiation module 13 radiates heat to the intelligent power module 11 according to the control signal. In such an implementation, the control module 12 and the intelligent power module 11 may not be electrically connected; similarly, the control module 12 and the intelligent power module 11 may not be electrically connected.

Alternatively, the wireless communication means may include, but is not limited to, any of the following: zig-Bee, bluetooth, infrared, wireless broadband (WIRELESS FIDELITY, wi-Fi), ultra Wide Band (UWB), near field communication (NEAR FIELD NFC for short).

In practical application, the control module 12 acquires the internal temperature of the intelligent power module 11 in real time, compares the internal temperature of the intelligent power module 11 with a preset temperature, and when the internal temperature of the intelligent power module 11 is greater than or equal to the preset temperature, if the control module 12 and the heat dissipation module 13 are electrically connected, the electric signal transmitted by the control module 12 to the heat dissipation module 13 is a first electric signal, and the first electric signal is used for indicating the heat dissipation module 13 to start a heat dissipation mode to dissipate heat of the intelligent power module 11; if the control module 12 and the heat dissipation module 13 adopt a wireless communication mode, the control signal transmitted by the control module 12 to the heat dissipation module 13 is a first control signal, and the first control signal is used for indicating the heat dissipation module 13 to start a heat dissipation mode to dissipate heat of the intelligent power module 11. When the internal temperature of the intelligent power module 11 is smaller than the preset temperature, if the control module 12 and the heat dissipation module 13 are electrically connected, the electric signal transmitted by the control module 12 to the heat dissipation module 13 is a second electric signal, and the second electric signal is used for indicating the heat dissipation module 13 to close the heat dissipation mode and stopping heat dissipation to the intelligent power module 11; if the control module 12 and the heat dissipation module 13 adopt the wireless communication mode, the control signal transmitted by the control module 12 to the heat dissipation module 13 is a second control signal, and the second control signal is used to instruct the heat dissipation module 13 to close the heat dissipation mode, and stop heat dissipation to the intelligent power module 11.

The frequency conversion device provided by the utility model is provided with an intelligent power module, a control module and a heat dissipation module; the heat dissipation module is arranged on the surface of the intelligent power module, and the control module is respectively and electrically connected with the intelligent power module and the heat dissipation module. The internal temperature of the intelligent power module is detected by a temperature detection unit built in the intelligent power module. Therefore, the real-time monitoring of the internal temperature of the intelligent power module is realized, the internal temperature is transmitted to the control module, the control module transmits the electric signal corresponding to the internal temperature to the heat dissipation module, and the heat dissipation module dissipates heat of the intelligent power module according to the electric signal. Therefore, the temperature of the intelligent power module is effectively reduced, the problem that the intelligent power module is damaged due to overhigh temperature is avoided, and the service life of the intelligent power module is prolonged; meanwhile, resource waste caused by ineffective heat dissipation can be reduced.

Optionally, referring to fig. 2, the smart power module 11 includes at least one pin 112, and the temperature detection unit 111 is electrically connected to the control module 12 through the at least one pin 112.

It will be appreciated that the intelligent power module 11 is electrically connected to the control module 12 via at least one pin, so as to realize that the temperature detection unit 111 is electrically connected to the control module 12 via at least one pin.

In one possible implementation, referring to fig. 3, the heat dissipation module 13 includes a heat sink 131 and a heat dissipation fan 132; the heat sink 131 is disposed on the first surface a1 of the intelligent power module 11; the heat radiation fan 132 is disposed on the first surface b1 of the heat radiator 131; the first surface b1 of the heat sink 131 is a surface of the heat sink 131 opposite to and far away from the first surface a1 of the intelligent power module 11, and the air outlet 1321 of the heat dissipating fan 132 faces the first surface a1 of the heat sink 131.

Optionally, the heat sink 131 is actually attached to the intelligent power module 11, for example, the heat sink 131 and the intelligent power module 11 may be fixed together by screws, so that the third surface a3 of the screw heat sink 131 is attached to the first surface a1 of the intelligent power module 11, and then heat of the intelligent power module 11 is conducted into the heat sink 131 by heat conduction.

Further, the control module 12 is electrically connected to the heat dissipation fan 132, so as to transmit an electrical signal corresponding to the internal temperature of the intelligent power module 11 to the heat dissipation fan 132; and then the heat dissipation fan 132 dissipates heat of the intelligent power module according to the electric signal.

Optionally, when the heat dissipating fan 132 receives the first electrical signal, it is turned on to blow air to the heat sink 131 and the intelligent power module 11, so as to dissipate heat and cool the heat sink 131 and the intelligent power module 11. When the cooling fan 132 receives the second electric signal, it is turned off to stop blowing air to the radiator 131 and the intelligent power module 11, and only the radiator 131 is used to cool the intelligent power module 11.

In one implementation, the cooling fan 132 may be in wireless communication with (i.e., in a wireless communication manner with) the control module 12, and the control module 12 transmits a control signal corresponding to the internal temperature of the smart power module 11 to the cooling fan 132 through a wireless signal.

Optionally, when the cooling fan 132 receives the first control signal, it is turned on to blow air to the radiator 131 and the intelligent power module 11, so as to cool and dissipate heat of the radiator 131 and the intelligent power module 11. When the cooling fan 132 receives the second control signal, it is turned off to stop blowing air to the radiator 131 and the intelligent power module 11, and only the radiator 131 is used to cool the intelligent power module 11.

In specific implementation, the manner in which the heat sink 131 is disposed on the first surface a1 of the intelligent power module 11 includes: the first surface a1 of the smart power module 11 may be provided with a bracket, and the heat sink 131 may be directly fixed to the bracket of the first surface a1 of the smart power module 11. Or the smart power module 11 includes a first fixing point and a second fixing point, wherein the positions of the first fixing point and the second fixing point are determined based on the ability to balance and fix the heat sink 131 to the first surface a1 of the smart power module 11. The heat sink 131 is detachably connected to the first and second fixing points, respectively. Wherein, the radiator 131 can be detachably connected with the first fixing point and the second fixing point through flange structures. The flange structure comprises a first flange plate, a second flange plate, a first bolt and a second bolt, wherein the first flange plate is provided with a first threaded hole, the second flange plate is provided with a second threaded hole, the first fixed point is provided with a third threaded hole, the second fixed point is respectively provided with a fourth threaded hole, a third fixed point is arranged at a position, opposite to the first fixed point, on the radiator 131, and a fourth fixed point is arranged at a position, opposite to the second fixed point, of the radiator 131, the third fixed point is provided with a fifth threaded hole, the second fixed point is provided with a sixth threaded control, and the first bolt is inserted into the first threaded hole, the third threaded hole and the fifth threaded hole to realize connection between the first fixed point and the third fixed point; the second bolt is inserted into the second threaded hole, the fourth threaded hole and the sixth threaded hole, and the connection between the second fixed point and the fourth fixed point can be achieved. If the radiator 131 has a problem, it can be conveniently disassembled for maintenance, replacement, etc. Of course, welding may be used instead of the flange structure.

Based on the foregoing, it is understood that the smart power module 11 is not limited to the two fixing points of the first fixing point and the second fixing point, and the actual number of fixing points provided on the smart power module 11 may be determined according to the actual shapes of the smart power module 11 and the heat sink 131. The fixing points on the radiator 131 are opposite to the intelligent power module 11 in position and the same in number.

In practical applications, the manner in which the heat dissipating fan 132 is disposed on the heat sink 131 may refer to the manner in which the heat sink 131 is disposed on the intelligent power module 11, which is not described herein.

In one possible implementation, the cooling fan 132 in the present utility model is not limited to turning on and off the corresponding two electrical signals or control signals, and the cooling fan 132 may include a plurality of wind power gears when turned on; each wind power gear corresponds to an electric signal or a control signal, and each wind power gear corresponds to a rotating speed.

Based on the above, when the cooling fan 132 includes a plurality of wind power gears when being turned on, the preset temperatures may be plural, and the plural preset temperatures are ordered according to the size or the height, and each two adjacent preset temperatures form a temperature interval, and all the temperatures included in the temperature interval correspond to one wind power gear.

For example, taking five preset temperatures of t1, t2, t3, t4 and t5 from low to high as an example, four temperature intervals of [ t1, t2], (t 2, t3], (t 3, t4], (t 4, t5] are formed correspondingly from low to high, the four temperature intervals correspond to the signal 1, the signal 2, the signal 3 and the signal 4 respectively, the corresponding rotation speeds of n1, n2, n3 and n4 from low to high, n1 < n2 < n3 < n4. are respectively, wherein n4 is the maximum rotation speed which can be born by a fan, wherein the rotation speed can be set according to actual needs, since the rotation speed which can be born by the heat dissipation fan 132 is limited, in the utility model, even if the temperature is increased further than t5, the rotation speed can not be increased any more, the maximum rotation speed which can be born by the heat dissipation fan 132 is still adopted for the case that the temperature exceeds t5, so as to protect the heat dissipation fan 132, the rotation speed can be always reduced, namely, the preset temperature can be understood to be set according to the specific service life of the preset temperature interval.

In one implementation manner, the control module 12 is specifically configured to obtain a correspondence between N temperature intervals divided in advance according to the temperature levels and the rotation speed of the fan; determining a temperature interval in which the internal temperature of the intelligent power module 11 is located; searching an electric signal corresponding to the determined temperature interval from the corresponding relation, and transmitting the electric signal corresponding to the internal temperature to the heat dissipation module 13; or searching the control signal corresponding to the determined temperature interval from the corresponding relation, and transmitting the control signal corresponding to the internal temperature to the heat dissipation module 13.

In one possible implementation, it is considered to provide the heat sink 131 on the first surface a1 of the smart power module 11; the heat dissipation fan 132 is disposed on the first surface b1 of the heat sink 131, which is equivalent to the case where the intelligent power module 11, the heat sink 131, and the heat dissipation fan 132 are disposed in a stacked manner, and may have an excessively high height. Accordingly, as shown in fig. 4, the heat dissipation module 13 includes a heat sink 131 and a heat dissipation fan 132; the radiator 132 is disposed on the first surface a1 of the intelligent power module 11; the heat radiation fan 132 is disposed on the second surface b2 of the heat radiator 131; the plane of the second surface b2 of the radiator 131 intersects with the plane of the first surface a1 of the intelligent power module 11, and the air outlet of the cooling fan 132 faces the second surface b2 of the radiator 131.

In this implementation manner, through setting up intelligent power module 11 and radiator fan 132 respectively on two adjacent surfaces of radiator 131, compare in setting up intelligent power module 11, radiator 131 and radiator fan 132 stack, when reducing the height, can also dispel the heat the cooling simultaneously to other components and parts that set up in radiator fan 132 air-out direction, for example other heating devices (i.e. other components and parts) such as reactor, transformer, common mode inductance to improve the life of components and parts.

In a possible implementation, referring to fig. 5, the frequency conversion device 1 further includes an electric control box 14, and the electric control box 14 includes an air inlet 141; the heat dissipation module 13 includes a heat sink 131 and a heat dissipation fan 132; the radiator 131, the intelligent power module 11 and the control module 12 are arranged in the cavity of the electric control box 14; the heat sink 131 is disposed on the first surface a1 of the intelligent power module 11; the heat dissipation fan 132 is disposed at the air inlet 141, and an air outlet of the heat dissipation fan 132 faces the first surface b1 of the heat sink 131, and the first surface a1 of the heat sink 131 is a surface of the heat sink 131 opposite to and far away from the first surface a1 of the intelligent power module 11.

In another possible implementation, referring to fig. 6, the frequency conversion device 1 further includes an electronic control box 14, and the electronic control box 14 includes an air inlet 141; the heat dissipation module 13 includes a heat sink 131 and a heat dissipation fan 132; the radiator 131, the intelligent power module 11 and the control module 12 are arranged in the cavity of the electric control box 14; the heat sink 131 is disposed on the first surface a1 of the intelligent power module 11; the heat dissipation fan 132 is disposed at the air inlet 141, and an air outlet of the heat dissipation fan 132 faces the second surface b2 of the heat sink 131; the plane in which the second surface b2 of the heat sink 131 is located intersects the plane in which the first surface a1 of the smart power module 11 is located.

Optionally, the frequency conversion device 1 further includes: as shown in fig. 7, the substrate 15, the intelligent power module 11, and the control module 12 are provided on the substrate 15.

Further, other components may be disposed on the substrate 15; such as reactors, transformers, common mode inductances, and the like.

The utility model also provides a range hood, which comprises the frequency conversion device.

The utility model also provides central purifying equipment comprising the range hood.

The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (18)

1. The frequency conversion device is characterized by comprising an intelligent power module, a control module and a heat dissipation module; the control module is respectively and electrically connected with the intelligent power module and the heat dissipation module; the heat dissipation module is arranged on the surface of the intelligent power module, and a temperature detection unit is arranged in the intelligent power module;

The temperature detection unit is used for detecting the internal temperature of the intelligent power module and transmitting the internal temperature to the control module;

The control module is used for transmitting the electric signal corresponding to the internal temperature to the heat dissipation module;

and the heat dissipation module is used for dissipating heat of the intelligent power module according to the electric signals.

2. The frequency conversion device of claim 1, wherein the intelligent power module comprises at least one pin through which the temperature detection unit is electrically connected to the control module.

3. The frequency conversion device of claim 1, wherein the heat dissipation module comprises a heat sink; the heat sink is disposed on the first surface of the intelligent power module.

4. A variable frequency device as claimed in claim 3, wherein a bracket is provided on the first surface of the intelligent power module, the heat sink being secured to the bracket.

5. A variable frequency device as claimed in claim 3, wherein the smart power module comprises at least one fixed point, the heat sink being detachably connected to each fixed point on the smart power module.

6. A variable frequency device as claimed in claim 5, wherein the heat sink is detachably connected to each fixed point on the intelligent power module via a flange structure.

7. The frequency conversion device according to claim 6, wherein at least one fixed point is provided on the heat sink, and the fixed points provided on the heat sink are opposite in position and consistent in number with the fixed points provided on the intelligent power module.

8. A variable frequency device according to claim 3, wherein the heat dissipation module further comprises a heat dissipation fan; the heat radiation fan is arranged on the first surface of the radiator; the first surface of the radiator is a surface which is opposite to and far away from the first surface of the intelligent power module in the radiator, and the air outlet of the cooling fan faces the first surface of the radiator.

9. The frequency conversion device according to claim 8, wherein the heat radiation fan is provided on the second surface of the heat sink; the plane where the second surface of the radiator is located intersects with the plane where the first surface of the intelligent power module is located, and the air outlet of the cooling fan faces the second surface of the radiator.

10. The frequency conversion device of claim 1, further comprising an electrical control box, the electrical control box comprising an air inlet; the heat dissipation module comprises a heat radiator; the radiator, the intelligent power module and the control module are arranged in the cavity of the electric control box, and the radiator is arranged on the first surface of the intelligent power module.

11. The frequency conversion device of claim 10, wherein the heat dissipation module further comprises a heat dissipation fan; the heat dissipation fan is arranged at the air inlet, the air outlet of the heat dissipation fan faces the first surface of the radiator, and the first surface of the radiator is a surface which is opposite to and far away from the first surface of the intelligent power module in the radiator.

12. The frequency conversion device of claim 11, wherein an air outlet of the cooling fan faces the second surface of the heat sink, and a plane of the second surface of the heat sink intersects a plane of the first surface of the intelligent power module.

13. A variable frequency device according to any one of claims 8, 9, 11, 12, wherein the control module is electrically connected to the radiator fan.

14. The frequency conversion device according to any one of claims 8, 9, 11, 12, wherein the cooling fan comprises a plurality of wind power gears when turned on, each wind power gear corresponding to an electrical signal and a rotational speed;

The control module is specifically configured to determine a wind power gear of the cooling fan according to the internal temperature, generate an electrical signal corresponding to the wind power gear, and transmit the electrical signal to the cooling fan.

15. The variable frequency device of claim 14, wherein each wind gear corresponds to a temperature interval;

The control module is specifically configured to determine a temperature interval in which the internal temperature is located, and determine a wind power gear of the cooling fan according to the temperature interval in which the internal temperature is located.

16. The frequency conversion device of claim 1, further comprising: the intelligent power module and the control module are arranged on the substrate.

17. A range hood comprising a frequency conversion device according to any one of claims 1 to 16.

18. A central purifying apparatus comprising a range hood according to claim 17.