CN219514391U - Power converter - Google Patents

Abstract

The utility model discloses a power converter which comprises a shell, wherein the shell is provided with a first protection cavity and a second protection cavity which are arranged in a separated mode, a radiator is arranged in the first protection cavity, the first protection cavity is provided with a first air inlet and a first air outlet which are communicated with the outside, the second protection cavity is internally provided with a plurality of electronic devices and a heat exchanger, the heat exchanger is used for exchanging heat for the second protection cavity, the second protection cavity is provided with a second air inlet and a second air outlet, the second air inlet and the second air outlet are both communicated with the heat exchanger, the second air inlet is communicated with the first air inlet, and the power converter further comprises a heat dissipation wind wheel which is used for dissipating heat for the first air inlet. The technical scheme of the utility model is convenient for radiating the internal devices of the power converter.

Description

Power converter

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a power converter.

Background

Along with the development trend of miniaturization of products, some products, such as power converters, have their chassis size more and more miniaturized, but their power is higher and higher, so that their heat dissipation needs are larger and larger, if the heat dissipation requirement is difficult to meet only through the wall surface of the chassis, the heat cannot be dissipated in time, and the normal operation of the power converter is easily affected.

Disclosure of Invention

The utility model mainly aims to provide a power converter, which aims to conveniently dissipate heat for internal devices of the power converter.

To achieve the above object, the present utility model provides a power converter, comprising:

the shell, the shell has first protection chamber and the second protection chamber that separate the setting, first protection intracavity has the radiator, just first protection intracavity has first air intake and the first air outlet of outside intercommunication, second protection intracavity has a plurality of electronic components and heat exchanger, the heat exchanger is used for the heat transfer of second protection chamber, second protection chamber has second air intake and second air outlet, the second air intake with the second air outlet all with the heat exchanger communicates, just the second air intake intercommunication first air intake, the power converter still includes the heat dissipation wind wheel, the heat dissipation wind wheel is used for the intercommunication first air intake, for the heat dissipation in the shell.

Optionally, the heat dissipation wind wheel is located first air intake department, and is located the casing deviates from the one side of second protection chamber.

Optionally, the first protection cavity is internally provided with a plurality of radiators, the radiators are sequentially arranged on the side wall close to the second protection cavity at intervals, and the second air inlet is positioned between two adjacent radiators and is opposite to the heat dissipation wind wheel.

Optionally, the first protection cavity is separated from the second protection cavity by a partition board, and the radiator and the second air inlet are both arranged on the partition board.

Optionally, at least one of the plurality of electronic devices is fixed on a side wall of the second protection cavity adjacent to the first protection cavity, and is disposed adjacent to the heat sink.

Optionally, the second air outlet is disposed on the partition plate and is disposed near the first air outlet.

Optionally, the heat exchanger is fixed on the partition plate and is located between the second air inlet and the second air outlet.

Optionally, a turbulent wind wheel is further arranged in the second protection cavity, the turbulent wind wheel enables the gas in the second protection cavity to flow according to a preset flow path, and the heat exchanger and at least one of the plurality of electronic devices are located on the flow path.

Optionally, the heat exchanger includes air inlet chamber, air-out chamber and at least one heat transfer passageway of intercommunication each other, the second air intake intercommunication the air inlet chamber, the second air outlet intercommunication the air-out chamber.

Optionally, the heat exchanger further comprises a fixed core, and a plurality of heat exchange channels wound around the periphery of the fixed core, wherein the plurality of heat exchange channels are arranged along the axial direction of the fixed core.

Optionally, the heat exchanger further comprises a heat exchange sleeve, the heat exchange sleeve and the fixed core form an air passage together, the heat exchange passage is wound on the air passage, and two ends of the heat exchange passage penetrate through the heat exchange sleeve to be respectively communicated with the air inlet cavity and the air outlet cavity; and/or the number of the groups of groups,

the outer periphery of the heat exchange channel is provided with a plurality of radiating fins which are arranged at intervals.

Optionally, a turbulent wind wheel is further arranged in the second protection cavity, and the turbulent wind wheel is arranged at one end or two opposite ends of the heat exchanger; or the turbulent wind wheel is arranged in the heat exchanger and is positioned among the heat exchange channels.

According to the technical scheme, the first protection cavity and the second protection cavity which are arranged in a separated mode are formed in the shell, a plurality of electronic devices are arranged in the second protection cavity, the first protection cavity is provided with the first air inlet and the first air outlet which are communicated with the outside, the second protection cavity is provided with the second air inlet and the second air outlet, the second air inlet and the second air outlet are both communicated with the heat exchanger, and the second air inlet is communicated with the first protection cavity. Therefore, the protection level of the second protection cavity is improved, the interference of the external environment to a plurality of electronic devices in the second protection cavity is reduced, and the use safety of the power converter is ensured. The first protection cavity is internally provided with a radiator, so that the heat dissipation of the power converter is assisted, and the heat dissipation efficiency of the power converter through the shell is enhanced. And the second protection cavity is internally provided with a heat exchanger, and the heat exchanger can introduce external low-temperature air, so that the temperature of the high-temperature air in the second protection cavity is reduced, and the external air is not in direct contact with the gas in the second protection cavity, so that the heat dissipation efficiency of the second protection cavity can be improved, and the protection level of the second protection cavity can be ensured. The first air intake of heat dissipation wind wheel intercommunication for accelerate the air flow of first protection intracavity, and the first air intake of second air intake intercommunication, the same heat dissipation wind wheel of second air intake and first air intake sharing promptly, make the air velocity of flow that the heat dissipation wind wheel also can accelerate the entering second air intake, and then accelerate the air cycle in the heat exchanger, thereby further improve radiating efficiency, and reduce the scheme that sets up a heat dissipation wind wheel in addition, thereby practice thrift the complete machine space of power converter.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram illustrating an angle structure of a power converter according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of another angle configuration of the power converter of FIG. 1;

FIG. 3 is a schematic diagram of another angle structure of the power converter of FIG. 1;

fig. 4 is an exploded view of a heat exchanger in the power converter of fig. 1.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Power converter	141	Power device
110	Shell body	142	Magnetic device
				111	First protective cavity	143	Capacitance device
112	Second protective cavity	150	Heat exchanger
				113	First air inlet	151	Air inlet cavity
114	First air outlet	152	Air outlet cavity
				115	Second air inlet	153	Heat exchange channel
116	Second air outlet	154	Fixed core
				117	Partition board	155	Heat exchange sleeve
120	Radiator	156	Air passage
				130	Heat dissipation wind wheel	157	Radiating fin
140	Electronic device	160	Turbulent wind wheel

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model proposes a power converter 100.

In the embodiment of the utility model, as shown in fig. 1 to 3, the power converter 100 includes a housing 110, the housing 110 has a first protection cavity 111 and a second protection cavity 112 that are separately disposed, the first protection cavity 111 has a radiator 120 therein, the first protection cavity 111 has a first air inlet 113 and a first air outlet 114 that are communicated with the outside, the second protection cavity 112 has a plurality of electronic devices 140 and a heat exchanger 150 therein, the heat exchanger 150 is used for exchanging heat for the second protection cavity 112, the second protection cavity 112 has a second air inlet 115 and a second air outlet 116, the second air inlet 115 and the second air outlet 116 are both communicated with the heat exchanger 150, the second air inlet 115 is communicated with the first air inlet 113, the power converter 100 further includes a heat dissipation wind wheel 130, and the heat dissipation wind wheel 130 is communicated with the first air inlet 113 to dissipate heat in the housing 110.

Specifically, the protection level of the second protection cavity 112 is higher than that of the first protection cavity 111, i.e., the sealing degree of the first protection cavity 111 is smaller than that of the second protection cavity 112. Therefore, the first protection cavity 111 is directly communicated with the external environment through the first air inlet 113 and the first air outlet 114, and the second protection cavity 112 is communicated with the first protection cavity 111 through the second air inlet 115, and is indirectly communicated with the external environment. Thereby reducing interference from the external environment to the plurality of electronic devices 140 within the second protected cavity 112 and ensuring safe use of the power converter 100. The first protection cavity 111 has a heat sink 120 therein, thereby assisting the heat dissipation of the power converter 100 and enhancing the heat dissipation efficiency of the power converter 100 through the housing 110. The second protection cavity 112 is provided with a heat exchanger 150, and the heat exchanger 150 can introduce external low-temperature air to cool the high-temperature air in the second protection cavity 112, and referring to fig. 2, the direction indicated by the arrow in fig. 2 is the flow path of the external air in the housing 110, and the external air is not in direct contact with the gas in the second protection cavity 112, so that the heat dissipation efficiency of the external air can be improved, and the protection level of the second protection cavity 112 can be ensured. The heat dissipation wind wheel 130 is communicated with the first air inlet 113, so that air flow in the first protection cavity 111 is accelerated, the second air inlet 115 is communicated with the first air inlet 113, namely, the second air inlet 115 and the first air inlet 113 share the same heat dissipation wind wheel 130, so that the air flow rate of the heat dissipation wind wheel 130 entering the second air inlet 115 can be accelerated, the air circulation in the heat exchanger 150 is accelerated, the heat dissipation efficiency is further improved, the scheme of additionally arranging the heat dissipation wind wheel 130 is reduced, and the whole space of the power converter 100 is saved.

The second air outlet 116 may be connected to the first protection cavity 111, and further connected to an external environment. And can also be directly communicated with the external environment. The plurality of electronic devices 140 includes a power device 141, a magnetic device 142, and a capacitor 143.

The heat dissipation wind wheel 130 is directly connected to the first air inlet 113, that is, in an embodiment, the heat dissipation wind wheel 130 is disposed at the first air inlet 113 and is located at a side of the housing 110 away from the second protection cavity 112. The heat dissipation wind wheel 130 can directly accelerate the air flow of the first air inlet 113, so as to reduce the air flow path from the heat dissipation wind wheel 130 to the first air inlet 113 and improve the heat exchange efficiency. While the heat dissipation wind wheel 130 is disposed in the first air inlet 113, in other embodiments, the heat dissipation wind wheel 130 may also be disposed in the first protection cavity 111, or in the first air inlet. In another embodiment, the heat dissipation wind wheel 130 may also be connected to the first air inlet 113 through a heat dissipation air channel.

According to the technical scheme of the utility model, a first protection cavity 111 and a second protection cavity 112 which are arranged in a separated manner are formed in a shell 110, a plurality of electronic devices 140 are arranged in the second protection cavity 112, the first protection cavity 111 is provided with a first air inlet 113 and a first air outlet 114 which are communicated with the outside, the second protection cavity 112 is provided with a second air inlet 115 and a second air outlet 116, the second air inlet 115 and the second air outlet 116 are both communicated with a heat exchanger 150, and the second air inlet 115 is communicated with the first protection cavity 111. Thereby improving the protection level of the second protection cavity 112, reducing the interference of the external environment to the plurality of electronic devices 140 in the second protection cavity 112, and ensuring the use safety of the power converter 100. The first protection cavity 111 has a heat sink 120 therein, thereby assisting the heat dissipation of the power converter 100 and enhancing the heat dissipation efficiency of the power converter 100 through the housing 110. And the second protection cavity 112 is internally provided with the heat exchanger 150, and the heat exchanger 150 can introduce external low-temperature air so as to cool the high-temperature air in the second protection cavity 112, and the external air is not in direct contact with the gas in the second protection cavity 112, so that the heat dissipation efficiency of the second protection cavity 112 can be improved, and the protection level of the second protection cavity 112 can be ensured. The heat dissipation wind wheel 130 is communicated with the first air inlet 113, so that air flow in the first protection cavity 111 is accelerated, the second air inlet 115 is communicated with the first air inlet 113, namely, the second air inlet 115 and the first air inlet 113 share the same heat dissipation wind wheel 130, so that the air flow rate of the heat dissipation wind wheel 130 entering the second air inlet 115 can be accelerated, the air circulation in the heat exchanger 150 is accelerated, the heat dissipation efficiency is further improved, the scheme of additionally arranging the heat dissipation wind wheel 130 is reduced, and the whole space of the power converter 100 is saved.

Further, the first protection cavity 111 is provided with a plurality of heat sinks 120, the plurality of heat sinks 120 are sequentially arranged on the side wall close to the second protection cavity 112 at intervals, and the second air inlet 115 is located between two adjacent heat sinks 120 and is opposite to the heat dissipation wind wheel 130. Specifically, in order to improve the heat dissipation efficiency, the first protection cavity 111 is provided therein with a plurality of heat sinks 120, and the plurality of heat sinks 120 are sequentially arranged on the side wall close to the second protection cavity 112 at intervals, thereby improving the heat dissipation area of the second protection cavity 112 and further improving the heat dissipation efficiency thereof. The second air inlet 115 is sandwiched between the two heat sinks 120, so that not only the temperature of the air entering the second air inlet 115 can be further reduced, but also the structural arrangement in the power converter 100 can be more compact. And the second air inlet 115 is opposite to the heat dissipation wind wheel 130, so that on one hand, the heat dissipation wind wheel 130 can make the air flow directly blow the heat dissipation device 120, thereby reducing the air flow path, increasing the air flow rate, improving the air inlet speed entering the second air inlet 115, improving the heat exchange efficiency, and on the other hand, reducing the resistance of the heat dissipation wind wheel 130.

Further, the first protection cavity 111 and the second protection cavity 112 are separated by a partition 117, and the radiator 120 and the second air inlet 115 are both disposed on the partition 117. Specifically, the radiator 120 and the second air inlet 115 are both disposed on the partition 117, so as to improve the heat dissipation efficiency of the second protection cavity 112, and further dissipate heat of the electronic device 140 in the second protection cavity 112.

As the heat dissipation efficiency of the heat sink 120 to the second protection cavity 112 is further improved. In an embodiment, at least one of the plurality of electronic devices 140 is fixed on a side wall of the second protection cavity 112 near the first protection cavity 111 and is disposed near the heat sink 120. Specifically, preferably, at least one of the plurality of electronic devices 140 and the heat sink 120 are attached to the side wall of the first protection cavity 111 through the second protection cavity 112, that is, through the partition 117, so that the heat sink 120 is convenient for dissipating heat of the electronic devices 140, and the heat dissipation efficiency of the heat sink 120 is further improved. In this embodiment, the power device 141 of the plurality of electronic devices 140 is attached to the partition 117. Of course, in other embodiments, the magnetic device 142 and/or the capacitor 143 may also be disposed in close proximity to the spacer 117.

Referring again to fig. 1 and 2, in one embodiment, the second air outlet 116 is disposed on the partition 117 and is disposed adjacent to the first air outlet 114. Specifically, the second air outlet 116 is communicated with the first protection cavity 111, thereby being communicated with the external environment. And the second air outlet 116 is disposed close to the first air outlet 114, so that the air after heat exchange can be quickly discharged from the first air outlet 114 after being discharged from the second air outlet 116, and the possibility of the air staying in the first protection cavity 111 is reduced.

Referring to fig. 1 to 3, in an embodiment, the heat exchanger 150 is fixed on the partition 117 and is located between the second air inlet 115 and the second air outlet 116. Specifically, the heat exchanger 150 is fixed on the partition 117, and the air inlet end of the heat exchanger 150 is near the second air inlet 115, and the air outlet end of the heat exchanger 150 is near the second air outlet 116, so that the flow path from the second air inlet 115 to the heat exchanger 150 and the flow path from the heat exchanger 150 to the second air outlet 116 are reduced, the circulation of the external air in the second protection cavity 112 is accelerated, and the heat exchange efficiency of the heat exchanger 150 is increased.

To further accelerate the air flow in the second protection cavity 112, in an embodiment, a turbulent wind wheel 160 is further disposed in the second protection cavity 112, and the turbulent wind wheel 160 makes the air in the second protection cavity 112 flow according to a preset flow path, and the heat exchanger 150 and at least one of the plurality of electronic devices 140 are located on the flow path. Specifically, the turbulent wind wheel 160 can accelerate the air flow in the second protection cavity 112, thereby accelerating the air circulation and improving the cooling efficiency. Referring to fig. 3, the direction indicated by the arrow in fig. 3 is a preset flow path of the air in the second protection cavity 112 driven by the turbulent wind wheel 160, and at least one of the heat exchanger 150 and the plurality of electronic devices 140 is located on the flow path, so as to form an air flow circulation, and accelerate the heat exchange efficiency of the heat exchanger 150 on the electronic devices 140.

Referring to fig. 4, in an embodiment, the heat exchanger 150 includes an air inlet chamber 151, an air outlet chamber 152 and at least one heat exchange channel 153 that are mutually communicated, the second air inlet 115 is communicated with the air inlet chamber 151, and the second air outlet 116 is communicated with the air outlet chamber 152. Specifically, the air inlet cavity 151 is used for communicating the second air inlet 115 with the air inlet end of the heat exchange channel 153, and the air outlet cavity 152 is used for communicating the second air outlet 116 with the air outlet end of the heat exchange channel 153, and as the heat exchanger 150 may have a plurality of heat exchange channels 153, the air inlet cavity 151 is communicated with the air outlet cavity 152, so that the installation of the heat exchanger 150 is further facilitated.

Further, the heat exchanger 150 further includes a fixed core 154, and a plurality of heat exchanging channels 153 wound around the periphery of the fixed core 154, and the plurality of heat exchanging channels 153 are arranged along the axial direction of the fixed core 154. Specifically, the fixing core 154 is used for winding the heat exchange channels 153, so that the heat exchange channels 153 are fixed on the fixing core 154, the plurality of heat exchange channels 153 are convenient to fix to form a whole, the heat exchange efficiency of the heat exchanger 150 is improved, the plurality of heat exchange channels 153 are axially distributed along the fixing core 154, and the number of the heat exchange channels 153 can be increased or decreased according to actual heat exchange requirements.

Further, the heat exchanger 150 further includes a heat exchange sleeve 155, the heat exchange sleeve 155 and the fixed core 154 together form an air passage 156, the heat exchange passage 153 is arranged around the air passage 156, and two ends of the heat exchange passage 153 penetrate through the heat exchange sleeve 155 to be respectively communicated with the air inlet cavity 151 and the air outlet cavity 152. Specifically, the heat exchange sleeve 155 and the fixed core 154 together form the air passage 156, and when the air in the second protection cavity 112 is blown into the air passage 156 by the turbulent fan, the air exchange sleeve exchanges heat with the air in the air passage 156 to cool. And the heat exchange sleeve 155 is sleeved on the fixed core 154, so that the heat exchange channel 153 is clamped and fixed in the air passage 156, and the structural integrity of the heat exchanger 150 is improved.

In another embodiment, the outer periphery of the heat exchanging channel 153 has a plurality of heat dissipating fins 157 arranged at intervals. Thereby increasing the area and improving the heat exchange efficiency of the heat exchanger 150.

In an embodiment, a turbulent wind wheel 160 is further disposed in the second protection cavity 112, and the turbulent wind wheel 160 is disposed at one end or two opposite ends of the heat exchanger 150. Specifically, if the turbulent wind wheel 160 is disposed at one end of the heat exchanger 150, the turbulent wind wheel 160 can suck wind to the wind passing channel 156 in the heat exchanger 150, so as to blow the air after heat exchange to the surface of the electronic device 140, and cool the electronic device 140; it is also possible to blow air to the air passing passage 156 in the heat exchanger 150, thereby accelerating the air flow speed in the air passing passage 156 and accelerating the heat exchange efficiency.

In another embodiment, the turbulent wind wheel 160 is disposed in the heat exchanger 150 and is located between the plurality of heat exchanging channels 153. Specifically, the turbulent wind wheel 160 is disposed in the heat exchanger 150, and the turbulent wind wheel 160 is sandwiched between two adjacent heat exchange channels 153, and the turbulent wind wheel 160 blows air while sucking air, so as to accelerate the air flow speed in the air passage 156 and heat exchange efficiency.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (12)

1. A power converter, comprising:

the shell, the shell has first protection chamber and the second protection chamber that separate the setting, first protection intracavity has the radiator, just first protection intracavity has first air intake and the first air outlet of outside intercommunication, second protection intracavity has a plurality of electronic components and heat exchanger, the heat exchanger is used for the heat transfer of second protection chamber, second protection chamber has second air intake and second air outlet, the second air intake with the second air outlet all with the heat exchanger communicates, just the second air intake intercommunication first air intake, the power converter still includes the heat dissipation wind wheel, the heat dissipation wind wheel is used for the intercommunication first air intake, for the heat dissipation in the shell.

2. The power converter of claim 1, wherein the heat dissipation wind wheel is disposed at the first air inlet and is located at a side of the housing facing away from the second protection cavity.

3. The power converter of claim 2, wherein the first protection cavity is provided with a plurality of heat sinks, the plurality of heat sinks are sequentially arranged on the side wall close to the second protection cavity at intervals, and the second air inlet is positioned between two adjacent heat sinks and is opposite to the heat dissipation wind wheel.

4. The power converter of claim 3 wherein said first protective chamber is separated from said second protective chamber by a partition, said heat sink and said second air inlet being disposed on said partition.

5. The power converter of claim 3 wherein at least one of said plurality of electronic devices is secured to a side wall of said second protective cavity adjacent said first protective cavity and is disposed adjacent said heat sink.

6. The power converter of claim 4, wherein the second air outlet is disposed on the partition and is disposed proximate to the first air outlet.

7. The power converter of claim 6 wherein said heat exchanger is secured to a partition and is positioned between said second air inlet and said second air outlet.

8. The power converter of claim 1, wherein a turbulent wind wheel is further disposed in the second protection cavity, the turbulent wind wheel causes the gas in the second protection cavity to flow according to a preset flow path, and the heat exchanger and at least one of the plurality of electronic devices are located on the flow path.

9. The power converter of any of claims 1-8, wherein the heat exchanger comprises an air inlet chamber, an air outlet chamber, and at least one heat exchange channel in communication with each other, the second air inlet communicates with the air inlet chamber, and the second air outlet communicates with the air outlet chamber.

10. The power converter of claim 9, wherein the heat exchanger further comprises a stationary core, and a plurality of the heat exchanging channels around a periphery of the stationary core, the plurality of the heat exchanging channels being arranged along an axial direction of the stationary core.

11. The power converter as set forth in claim 10, wherein said heat exchanger further comprises a heat exchange sleeve, said heat exchange sleeve and said stationary core together form an air passage, and said heat exchange passage is wound around said air passage, and both ends of said heat exchange passage pass through said heat exchange sleeve to communicate said air inlet chamber and said air outlet chamber, respectively; and/or the number of the groups of groups,

the outer periphery of the heat exchange channel is provided with a plurality of radiating fins which are arranged at intervals.

12. The power converter of claim 10, wherein a turbulent wind wheel is further disposed in the second protection cavity, and the turbulent wind wheel is disposed at one end or at opposite ends of the heat exchanger; or the turbulent wind wheel is arranged in the heat exchanger and is positioned among the heat exchange channels.