CN117560873A

CN117560873A - An electrical cabinet

Info

Publication number: CN117560873A
Application number: CN202311433275.XA
Authority: CN
Inventors: 魏礼贵; 卢艺杰; 曾春保; 林镇煌; 赵燕河
Original assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Current assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2024-02-13
Anticipated expiration: 2043-10-31
Also published as: CN121618335A; CN117560873B

Abstract

The invention discloses an electrical cabinet, which comprises a cabinet body, a heat exchanger, a first electrical part and a second electrical part, wherein the cabinet body is provided with a heat dissipation cavity, and a first side wall and a second side wall which are parallel and opposite to each other are arranged in the heat dissipation cavity along a first direction; the heat exchanger is provided with a cold air port and a hot air port close to the second side wall; the first electric piece is arranged in the heat dissipation cavity and is close to the first side wall; the second electric piece is arranged in the heat dissipation cavity and positioned between the heat exchanger and the first electric piece along the first direction, and the heat productivity of the second electric piece is larger than that of the first electric piece; the air conditioner further comprises an electrical plate which is in a plate-shaped structure and is suitable for carrying a plurality of electrical units, wherein an included angle is formed between the electrical plate and the second side wall, so that the air flow of the air conditioner passes through the second electrical part and is guided to the first electrical part through the second electrical part. The electric cabinet provided by the invention has the advantages that the heat dissipation efficiency of the first electric component and the second electric component is high, and the power density of the electric cabinet is high.

Description

Electrical cabinet

Technical Field

The invention relates to the technical field of electricity, in particular to an electrical cabinet.

Background

The electrical cabinets such as photovoltaic inverter, energy storage converter cabinet generally include IGBT power module, electric capacity module, IGBT power module and electric capacity module have higher heat dissipation requirement and protection requirement, prior art like in patent CN111465289A, electric capacity busbar module 6 (the right side part of reference numeral 6 in the figure 1) is located the top of the cold wind air outlet of heat exchanger 4, and be the diagonal setting with the cold wind air outlet of heat exchanger 4 basically, and still separate second wind channel 25 between electric capacity busbar module 6 and the heat exchanger 4, therefore electric capacity busbar module 6 is located the blind area of the air flow of heat exchanger 4 basically, consequently, need set up vortex fan 10, the air outlet of vortex fan 10 just sets up to electric capacity busbar module 6, the wind from vortex fan 10 passes through electric capacity busbar module 6 back accessible heat exchanger 4 and carries out the bad heat dissipation, but because electric capacity busbar module 6 is laminated with the wall of first wind channel 24, the heat of electric capacity busbar module 6 is easy to accumulate, the radiating efficiency is low, and because the wind current of vortex fan 10 is easy to produce the interference to the air outlet of heat exchanger 4, the cold wind current of heat vortex fan 10 produces the interference to the heat exchanger 4, the cold wind current of wind exchanger 4 also produces the wind current, the cold wind current of wind from vortex fan 10 is more than the cold wind current 4 is more than the heat exchanger 4, the cold wind current circulation part is more than the heat exchanger 4 is more than the cold wind current 1, the cold wind current is more than the cold wind current part is more than the heat exchanger 1, the cold wind current part is more than the cold current 1, the cold wind part is more than the cold current part is more circulated, and has been more the cold wind current, and has the cold wind current is more greatly separated, and has the cold wind, and has the efficiency is more energy has low energy consumption, and has high efficiency, and has the efficiency and has low energy. In practical application, the regulator cubicle generally has prescribed height, width and length, and the electrical components under certain power also has standard volume, when needs holding more electrical components in the regulator cubicle, because the restriction in space, can not form sufficient heat dissipation distance between a plurality of electrical components, promptly the radiating efficiency is difficult to reach standard, therefore, current regulator cubicle can solve this problem through reducing the power specification of electrical components and then reduce its calorific capacity, but the power of electrical components also reduces after the power specification of electrical components descends to lead to the power density reduction of whole regulator cubicle.

Disclosure of Invention

The invention aims to overcome the defects or problems in the background art and provide the electrical cabinet, wherein the heat dissipation efficiency of the first electrical component and the second electrical component in the heat dissipation cavity is high, and the power density of the electrical cabinet is improved.

To achieve the above object, the present invention and its preferred embodiments adopt the following technical solutions but the embodiments are not limited to the following solutions:

according to the first technical scheme, the electrical cabinet comprises a cabinet body, wherein a heat dissipation cavity is formed in the cabinet body, and a first side wall and a second side wall which are parallel and opposite to each other are distributed in the heat dissipation cavity along a first direction; the heat exchanger is provided with a cold air port for conveying cold air to the heat dissipation cavity and a hot air port for recycling hot air from the heat dissipation cavity close to the second side wall; the first electric piece is arranged in the heat dissipation cavity and is close to the first side wall; the second electric piece is arranged in the heat dissipation cavity and positioned between the heat exchanger and the first electric piece along the first direction; the air conditioner further comprises an electrical plate which is in a plate-shaped structure and is suitable for carrying a plurality of electrical units, wherein the electrical plate forms an included angle with the second side wall, so that the air flow of the air cooling opening passes through the second electrical part and is guided to the first electrical part through the second electrical part.

Based on the first technical scheme, still be equipped with technical scheme two, in the technical scheme two, the electrical plate extends along first direction and will the heat dissipation chamber separates into with cold wind mouth corresponding first overwind district and with hot wind mouth corresponding second overwind district, electrical unit is located first overwind district, the calorific capacity of second electrical part is greater than first electrical part.

Based on the second technical scheme, still be equipped with the third technical scheme, in the third technical scheme, electrical panel level sets up, first overwind district is located electrical panel's below.

Based on the third technical scheme, a fourth technical scheme is further provided, in the fourth technical scheme, a first supporting surface suitable for supporting the first electric component is arranged on the bottom wall of the heat dissipation cavity; the second electrical component is higher than the first bearing surface and at least partially opposite the first bearing surface.

Based on the fourth technical scheme, a fifth technical scheme is further provided, and the device further comprises a third electric part, wherein the heating value of the third electric part is smaller than that of the second electric part; the cold air port and the hot air port are perpendicular to the first direction and extend along the second direction perpendicular to the first direction, and the hot air port is higher than the cold air port; the bottom wall of the heat dissipation cavity is also provided with a wind shielding surface perpendicular to the first direction and a second supporting surface parallel to the first supporting surface towards the second side wall, and the upper end and the lower end of the wind shielding surface are respectively connected with the first supporting surface and the second supporting surface; the third electric piece is arranged in the heat dissipation cavity and is arranged on the second supporting surface, and is close to the cold air port and lower than the first supporting surface; the second electrical component is also at least partially opposite the second bearing surface.

Based on the technical scheme five, a technical scheme six is further provided, in the technical scheme six, each electric unit is combined along the first direction to form two electric modules, and a heat dissipation air duct extending along the second direction is formed between the two electric modules; and the projection of the heat dissipation air duct along the vertical direction is positioned on the second supporting surface.

Based on the technical scheme six, a technical scheme seven is further arranged, and the high-heat-generation piece, the heat exchange device and the wind flow driving module are further included in the technical scheme seven; the high heating element is arranged in the heat dissipation cavity and is positioned in the second air passing area; the top of the cabinet body is provided with an air passing cavity, the heat dissipation cavity is relatively airtight, and the air passing cavity is provided with a main air inlet and an air outlet; the heat exchange device comprises a liquid cooling unit arranged in the air passing cavity and a liquid cooling plate which is arranged in the heat dissipation cavity and dissipates heat of the high-heat-generation part, and the liquid cooling unit is communicated with a liquid inlet and a liquid outlet of the liquid cooling plate; the wind flow driving module is arranged in the wind passing cavity and drives wind to flow to the air outlet through the liquid cooling unit.

Based on the seventh technical scheme, still be equipped with technical scheme eight, in technical scheme eight, the piece that generates heat highly is located the second electrical component top, the liquid cooling board with electrical panel is parallel and relative and between the two form the wind clearance.

Based on the technical scheme eight, a technical scheme nine is further provided, wherein in the technical scheme nine, the power module is close to the hot air port and lower than the hot air port; the first electric piece is a direct current electric piece, the second electric piece is a capacitor module, the third electric piece is an alternating current electric piece, and the high heating piece is a power module.

Based on the technical scheme nine, a technical scheme ten is further arranged, and in the technical scheme ten, the cabinet body is provided with an air port connected with the through air cavity and the heat dissipation cavity; the main air inducing opening is arranged on the first side wall, and the air outlet is arranged at the top of the cabinet body; the heat exchanger is an air heat exchanger and is arranged on the inner surface of the second side wall; the second side wall of the heat dissipation cavity is provided with an air inlet; the air heat exchanger is provided with a first air flow passage and a second air flow passage, the first air flow passage is communicated with the air inlet and the air outlet, and the second air flow passage is provided with the cold air outlet and the hot air outlet; the wind flow driving module also drives wind to flow from the air inlet to the air outlet through the air passing opening; the first air flow passage and the second air flow passage exchange heat to take away the heat of the second air flow passage.

As can be seen from the above description of the present invention and the preferred embodiments thereof, compared with the prior art, the technical solution of the present invention and the preferred embodiments thereof have the following beneficial effects due to the following technical means:

The applicant can be seen from continuous observation, experiments and researches that, in the prior art, the technical problems of low heat dissipation efficiency and high cost of the capacitor module and the direct current electric component are caused because a turbulent fan needs to be arranged, the heat dissipation surface of the capacitor module is blocked, heat is easy to accumulate, and the direct current electric component is basically positioned in a wind flow blind area.

In the first technical scheme, the electrical plate and the second side wall form an included angle so that the air flow of the air cooling port passes through the second electrical plate and is guided to the first electrical plate through the second electrical plate, on one hand, the heat of the second electrical plate can be taken away by the air flow, the heat dissipation efficiency is high, and the structure of the second electrical plate can be used for separating the air flow in the heat dissipation cavity by using the structure of the second electrical plate, without arranging an air guide structure alone, part of the air flow flows on the surface of the electrical plate, and part of the air flow flows on the surface of the electrical unit, so that the heat of the second electrical plate can be taken away rapidly as the flow speed of the air flow closer to the surfaces of the electrical plate and the electrical unit is faster; on the other hand, as the first electric component is close to the first side wall and far away from the cold air port of the heat exchanger, the condition that no air passing exists easily, the electric board forms an included angle with the second side wall and enables cold air to flow to the first electric component under the guiding action of the electric board, so that the first electric component can pass the air, and the air resistance is smaller due to the flow guiding of the electric board, the heating values of the first electric component and the second electric component are not required to be reduced by reducing the power specification of the first electric component and the second electric component, and under the specification of the existing electric cabinet, the heat of the first electric component and the second electric component is timely taken away through reasonable and ingenious layout, so that the first electric component and the second electric component are allowed to have large heating values, namely the first electric component and the second electric component are allowed to have large power, and the power density of the electric cabinet under the same specification is improved; it can be seen that, this technical scheme has fully utilized the structure of second electrical component itself to through ingenious overall arrangement, under the prerequisite that does not reduce the power specification of first electrical component and second electrical component, improved the radiating efficiency of second electrical component, also improved the radiating efficiency of first electrical component, thereby promoted power density, in addition, also need not to set up additional wind-guiding structure or vortex fan, reduced the cost, also made the space increase that does not have wind-guiding structure or vortex fan's heat dissipation chamber, thereby further promoted the power density of regulator cubicle.

In the second technical scheme, the electric plate extends along the first direction and divides the heat dissipation cavity into a first air passing area corresponding to the cold air port and a second air passing area corresponding to the hot air port, and the electric unit is positioned in the first air passing area, wherein the electric plate extends along the first direction, has small air resistance and good flow guiding effect, and has a certain length along the first direction, and the length can guide air flow; because the electric unit bears in the electric plate, therefore the hottest part in the second electric piece is the junction of electric plate and electric unit, secondly is the electric plate, and electric unit is located the first area of crossing wind that corresponds with the cold wind mouth, means that the second electric piece generates heat serious region and all is located first area of crossing wind, and consequently the heat of electric unit can be taken away in time by cold wind, and the heat of electric unit and electric plate junction can be taken away in time by cold wind, and the radiating efficiency of second electric piece is high. The arrangement ensures that the first electric component and the second electric component have higher heat dissipation efficiency when the heat productivity of the second electric component is larger than that of the first heat generating component.

In the third technical scheme, the electrical plate is horizontally arranged, the first air passing area is positioned below the electrical plate, so that the second electrical piece plays a role of a horizontal partition plate in the heat dissipation cavity, and as the density of cold air is greater than that of hot air, the temperature of the cold air rises to become hot air after passing through the first air passing area, so that the cold air flows back to the hot air port through the second air passing area, the air flow resistance is small, the circularity is better, the flow guiding effect of the horizontally arranged electrical plate on the cold air flowing to the first side wall is better, the air quantity at the first electrical piece is further increased, and the heat dissipation efficiency of the first electrical piece is improved; on the other hand, the arrangement makes full use of the space of the cabinet body along the first direction, is convenient for the layout of the electric components in the heat dissipation cavity, and has high space utilization rate.

In the fourth technical scheme, the second electric component is higher than the first supporting surface and at least partially opposite to the first supporting surface, so that an air passing gap is formed between the second electric component and the first supporting surface, and the flow speed of cold air is increased when the cold air flows through the air passing gap, so that the heat dissipation efficiency of the second electric component is increased, and the heat dissipation efficiency of the first electric component is also increased.

In the fifth technical scheme, the air cooling port and the air heating port are both perpendicular to the first direction and extend along the second direction perpendicular to the first direction, and the air heating port is higher than the air cooling port, so that air flow easily surrounds the whole second electric piece, and the air flow is maximum for the electric plate with the largest heating value and the lower surface of each electric unit, so that the heat dissipation efficiency of the second electric piece is higher; the third electric component is close to the air cooling port and is lower than the first supporting surface, and because the heating value of the third electric component is small, part of cold air flows to the third electric component first, after the cold air flows out of the third electric component, the cold air still has lower temperature, the cold air flows upwards and passes through the second electric component and the first electric component, and the other part of cold air directly flows to the second electric component, so that each electric component in the heat dissipation cavity has higher heat dissipation efficiency; the third electric component is lower than the first supporting surface, so that the interference to the wind flow flowing to the first electric component is avoided, and a large enough interval is formed between the second electric component and the third electric component to facilitate the large wind volume to pass wind; the wind shielding surface is perpendicular to the first direction and faces the second side wall, so that cold air flowing into the heat exchanger can collide with the wind shielding surface, and part of the cold air flows into a gap between the second electric component and the first supporting surface, so that the heat dissipation efficiency is high; therefore, the arrangement of the bottom wall of the heat dissipation cavity enables different height areas to be formed in the heat dissipation cavity, is beneficial to the layout of all electric parts in the heat dissipation cavity, and therefore the adjustment of air quantity and air speed is achieved, and the first, second and third electric parts are enabled to have higher heat dissipation efficiency.

In the sixth technical scheme, the cooling air duct is arranged to enable cold air to flow into the second electric component, so that heat of the second electric component is taken away more quickly, and the cooling efficiency of the second electric component is improved; the arrangement of the heat dissipation air duct also enables the electric plate to form a cold area along the middle part of the first direction, and the air current of the cold area flows to two sides respectively, so that the temperature of the electric plate on two sides of the first direction is reduced, the heat dissipation efficiency of the electric plate is greatly improved, the heat accumulation of the second electric piece is avoided, and the service life of the second electric piece is prolonged. The projection of the heat dissipation air duct along the vertical direction is positioned on the second supporting surface, so that cold air flow colliding with the cold air surface can flow into the heat dissipation air duct, and the heat dissipation efficiency of the second electric part is improved.

In the seventh technical scheme, the electric components in the heat dissipation cavity mainly dissipate heat through liquid cooling and air cooling, wherein the high-heat-generation components dissipate heat through liquid cooling, the liquid cooling heat dissipation mode has high heat dissipation efficiency, the low-heat-generation components such as the first electric component, the second electric component and the third electric component dissipate heat through air cooling, the heat dissipation efficiency is high, and the heat exchangers and the heat exchange devices dissipate heat through external circulation, so that the protection performance of the heat dissipation cavity can be well improved; in the technical scheme, the liquid cooling unit of the heat exchange device is arranged in the air passing cavity at the top, so that the air inlet of the heat exchange device is also positioned at the top, and the air inlet is far away from the ground, so that the air inlet temperature is lower, the heat dissipation efficiency of the liquid cooling unit is high, and the high heat dissipation efficiency of a high-heat-generation part is ensured; because the liquid cooling unit has no water inlet concern, the air outlet does not need to be arranged on the side part of the cabinet body, but can be arranged on the top of the cabinet body, so that heat flow disturbance is not easy to generate on the downstream electrical cabinet when a plurality of electrical cabinets are used in parallel, and even if heat flow flows out from the side surface of the top of the cabinet body, the influence on the downstream electrical cabinet is not easy to generate due to the small density of hot air; because the liquid cooling unit is arranged at the top, the side part of the cabinet body is not occupied, and the parallel operation of a plurality of electrical cabinets is facilitated. It can be known that in the technical scheme, the heat dissipation efficiency of the heating component in the heat dissipation cavity can be ensured to the maximum extent by the liquid cooling and air cooling matched heat dissipation mode, and the heat dissipation cavity has good protection performance; and the parallel operation of the electric cabinets is convenient, and the distance between the power cabinets is also convenient to reduce.

In the eighth technical scheme, an air passing gap is formed between the liquid cooling plate and the electrical plate, and the air flow speed of the air passing gap is fastest, so that the air flow can simultaneously and rapidly take away the heat of the second electrical piece and the high-heat-generating piece, and meanwhile, wiring is convenient.

In the ninth technical scheme, the heat productivity of the high heat-generating element in the heat dissipation cavity is the largest, and the high heat-generating element is close to the hot air port of the heat exchanger, so that the cold air flow flowing out of the cold air port of the heat exchanger can take away the heat of the low heat-generating element in the heat dissipation cavity firstly, and then take away the heat of the high heat-generating element, thereby ensuring the heat dissipation efficiency of the low heat-generating element; the high heating element is lower than the hot air port, so that the resistance is small when hot air flows back, and because the density of hot air in the air flow is less than that of air, cold air is in the lower part when the hot air flows back through the high heating element, and hot air is in the upper part, so that the heat exchanger can also take away the heat of the high heating element.

In the tenth technical scheme, the heat exchanger and the liquid cooling unit share the wind flow driving module, so that the air outlet is shared, and hot air generated by the heat dissipation cavity is exhausted from the air outlet at the top of the cabinet body, so that when a plurality of electric cabinets are used side by side along the first direction, the hot air of the air outlet of the upstream electric cabinet can not influence the main air inlet of the downstream electric cabinet; the heat exchanger is arranged on the inner surface of the second side wall, so that the heat exchanger is more attractive compared with the heat exchanger arranged on the outer surface of the second side wall, and if the heat exchanger is arranged on the outer surface of the second side wall, the hot air of the first air flow passage easily flows into the main air guiding opening of the downstream cabinet body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic diagram of a first embodiment of an electrical cabinet;

FIG. 3 is a second schematic diagram of an electrical cabinet according to an embodiment of the present invention;

FIG. 4 is a top view of an embodiment of the invention showing a hidden top panel of the cabinet;

FIG. 5 is an internal schematic view of an electrical cabinet according to an embodiment of the invention;

FIG. 6 is an internal schematic view of a hidden portion cover of an electrical cabinet according to an embodiment of the invention;

fig. 7 is a schematic diagram of a capacitor module, a power module and a liquid cooling plate according to an embodiment of the invention.

The main reference numerals illustrate:

a cabinet 10; a wind passing chamber 10A; an exhaust outlet 101; a heat dissipation chamber 10B; an air guide chamber 10C; a first side wall 11; a main air intake 111; a second side wall 12; an air inlet 121; a first abutment wall 13; a first air introduction port 131; a second abutment wall 14; a second air intake 141; a support plate 15; an air passing port 151; a partition plate 16; a first bearing surface 161; a wind shielding surface 162; a second bearing surface 163; a heat exchange device 20; a liquid cooling unit 21; a liquid cooling plate 22; a wind flow driving module 30; a high heat generating member 40; a low heat generating member 50; a first electrical component 51; a second electrical component 52; an electrical panel 521; an electrical module 522; a heat radiation surface 523; a heat dissipation air duct 01; a first windward region 02; a second overwind zone 03; a third electric component 53; a heat exchanger 60; a cold wind gap 61; and a hot air port 62.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the invention.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

Referring to fig. 2-7, fig. 2-7 illustrate an electrical cabinet including a cabinet body 10, a heat exchange device 20, a wind flow drive module 30, and a heat exchanger 60.

Referring to fig. 2 to 4, the cabinet 10 is in a rectangular parallelepiped shape, the cabinet 10 is provided with a first side wall 11 and a second side wall 12 parallel and opposite to each other along a first direction, and the cabinet 10 is provided with a first abutting wall 13 and a second abutting wall 14 parallel and opposite to each other along a second direction perpendicular to the first direction. The first direction is the up-down direction in fig. 4, the second direction is the left-right direction in fig. 4, and both the first direction and the second direction are the horizontal directions in the present embodiment.

In this embodiment, the cabinet body 10 is provided with a support plate 15 and a partition plate 16, referring to fig. 5-6, the support plate 15 divides the cabinet body 10 into an upper area and a lower area, the upper area forms an air passing cavity 10A, the partition plate 16 divides the lower area into a middle area and a bottom area, the middle area forms a heat dissipation cavity 10B, the bottom area forms an air guiding cavity 10C, i.e. the top of the cabinet body 10 is provided with the air passing cavity 10A, the bottom is provided with the air guiding cavity 10C, and the cabinet body 10 is provided with the heat dissipation cavity 10B between the air passing cavity 10A and the air guiding cavity 10C. Wherein, backup pad 15 extends along the horizontal direction, and division board 16 wholly takes the Z shape, and division board 16 is formed by two horizontal sections and a vertical section, and vertical section connects two horizontal sections and forms the Z shape division board.

In this embodiment, since the projection of the partition plate 16 in the second direction is Z-shaped, the partition plate 16 makes the air guiding chamber 10C form a first region (left side in fig. 6) and a second region (right side in fig. 6) which are communicated in the air intake direction, the first region is higher than the second region, and the partition plate 16 also makes the heat dissipating chamber 10B form a third region (left side in fig. 6) and a fourth region (right side in fig. 6) which are communicated in the air intake direction, respectively above the first region and the second region. Specifically, the bottom wall of the heat dissipation chamber 10B, that is, the partition plate 16 is provided with a horizontal first support surface 161, a wind shielding surface 162 perpendicular to the first direction, and a horizontal second support surface 163, and the upper and lower ends of the wind shielding surface 162 are respectively engaged with the first support surface 161 and the second support surface 163. Wherein the first bearing surface 161 is adjacent to the first sidewall 11 and the second bearing surface 163 is adjacent to the second sidewall 12. The bottom wall of the heat dissipation cavity 10B is arranged, so that different height areas are formed in the heat dissipation cavity 10B, and the layout of all electric components in the heat dissipation cavity 10B is facilitated.

Referring to fig. 2-3, the air passing cavity 10A is provided with a main air introducing opening 111 along a first direction on a first side wall 11, an air outlet 101 is arranged at the top, and the air outlet 101 is close to a second side wall 12; the air passing cavity 10A is further provided with a first air guiding port 131 and a second air guiding port 141 on the first abutting wall 13 and the second abutting wall 14 respectively, that is, the side part of the air passing cavity 10A is further provided with the first air guiding port 131 and the second air guiding port 141 which are opposite along the second direction.

Referring to fig. 3, the heat dissipation chamber 10B is provided with an air inlet 121 on the second side wall 12. Referring to fig. 5-6, the cabinet 10 is further provided with an air passing port 151 communicating the heat dissipation chamber 10B and the air passing chamber 10A, the air passing port 151 is far away from the main air introducing port 111 and is close to the second side wall 12, and in this embodiment, the air passing port 151 is opened on the support plate 15.

Referring to fig. 6, the wind guiding chamber 10C is used for placing electric components such as a reactor, which will not be described in detail in the present application.

Referring to fig. 3 to 6, the heat exchange device 20 includes a liquid cooling unit 21 disposed in the air passing cavity 10A and supported by the support plate 15, and a liquid cooling plate 22 disposed in the heat dissipating cavity 10B and dissipating heat from the high heat generating component 40, where the liquid cooling unit 21 is communicated with a liquid inlet and a liquid outlet of the liquid cooling plate 22, so as to convey cold liquid to the liquid cooling plate 22 and recover hot liquid from the liquid cooling plate, and realize liquid cooling circulation, and the liquid cooling unit 21 may adopt the prior art, and not described herein, the air flow driving module 30 is disposed at the air outlet 101 to drive air flow to be discharged from the air introducing port 111 to the air outlet 101 through the air passage. It should be appreciated that in this embodiment, the wind flow drive module 30 should have a higher level of protection. The liquid cooling unit 21 radiates heat through the main air inlet 111, the first air inlet 131, the second air inlet 141, the airflow driving module 30 and the air outlet 101, and has high heat exchange efficiency. The side walls of the cabinet body 10 except the first side wall 11 and the second side wall 12, namely the first abutting wall 13 and the second abutting wall 14 do not need to enter and exit air or maintenance, so that the side walls and other cabinet bodies 10 can be used for cabinet combining, and the work, heat dissipation and maintenance of the electrical cabinet are not affected; when a plurality of electrical cabinets are parallel-connected in the second direction, only the first air inlet 131 and the second air inlet 141 at the outermost side can be used for air intake. The air passing chamber 10A of the intermediate electric cabinet does not receive air from the first and second air introduction ports 131 and 141 due to the limitation of wind pressure.

Referring still to fig. 5-6, the heat generating component is disposed in the heat dissipation cavity 10B and includes a high heat generating component 40 and a low heat generating component 50, the high heat generating component 40 being an inverter module in this embodiment; the high heat generating element 40 radiates heat from the liquid cooling plate 22, and thus the water pipe of the liquid cooling unit 21 also passes through the support plate 15 and communicates with the liquid cooling plate 22.

The low heat generating element 50 includes a first electric element 51, a second electric element 52, and a third electric element 53, the first electric element 51 being adjacent to the first side wall 11 and supported on the first supporting surface 161, the third electric element 53 being adjacent to the second side wall 12 and supported on the second supporting surface 163; the second electrical component 52 is located between the first electrical component 51 and the third electrical component 53 and below the high heat generating component 40. In the present embodiment, the first electrical component 51 is a dc electrical component, the second electrical component 52 is a capacitor module, and the third electrical component 53 is an ac electrical component, so that the second electrical component 52 generates heat more than the first electrical component 51 and more than the third electrical component 53.

Referring to fig. 7, the second electrical component 52 includes an electrical plate 521 having a plate-like structure and adapted to carry a plurality of electrical units, i.e. capacitors, in this embodiment, each electrical unit is combined along a first direction to form two electrical modules 522, and a heat dissipation air duct 01 extending along a second direction is formed between the two electrical modules 522; the lower surfaces of the two electrical modules 522 form a heat dissipating surface 523. The electrical module 522 is formed by a plurality of capacitors, and one end of each capacitor is electrically connected to the electrical board 521 and is carried on the electrical board 521. In this embodiment, the electrical plate 521 forms an angle with the second side wall 12, so that the air flow from the air inlet 61 passes through the second electrical member 52 and is guided to the first electrical member 51 by the second electrical member 52, where the angle may be a right angle, an acute angle or an obtuse angle. Referring to fig. 6, the electrical panel 521 extends in the first direction and divides the heat dissipation chamber 10B into a first air passing region 02 corresponding to the cool air port 61 and a second air passing region 03 corresponding to the hot air port 62, and the electrical unit is located in the first air passing region 02. In this embodiment, it is preferable that the electrical plate 521 is parallel to the horizontal direction, a plurality of heat dissipation holes are formed in the electrical plate 521, a heat dissipation surface 523 is formed on a side of the electrical unit facing away from the electrical plate 521, the first ventilation area 02 is located below the electrical plate 521, and the heat dissipation surface 523 is also located below the electrical plate 521.

Wherein the first electrical component 51 is disposed in a third zone and the third electrical component 53 is disposed in a fourth zone and below the first bearing surface 161, and the second electrical component 52 spans the third zone and the fourth zone. The high heat generating element 40 is located above the fourth area, and the liquid cooling plate 22 is parallel to and opposite to the electrical plate 521, and forms an air-passing gap therebetween. The second electrical component 52 is partially opposite to the first supporting surface 161, partially opposite to the second supporting surface 162, and the heat dissipation air duct 01 is staggered from the projection of the first supporting surface 161 along the vertical direction.

The electrical connection relationship in the heat dissipation chamber 10B is that the first electrical component 51 is connected to the second electrical component 52, the second electrical component 52 is connected to the high heat generating component 40, and the high heat generating component 40 is connected to the third electrical component 53.

The heat exchanger 60 is an air heat exchanger in this embodiment, and is disposed on the inner surface of the second side wall 12; the heat exchanger 60 is provided with a cold air port 61 for supplying cold air to the heat dissipation chamber 10B and a hot air port 62 for recovering hot air from the heat dissipation chamber 10B; wherein, the hot air port 62 and the cold air port 61 face the first side wall 11, the hot air port 62 is higher than the cold air port 61, the hot air port 62 and the cold air port 61 extend along the second direction, in practical application, an air draft fan is further arranged at the hot air port 62, the axis of the air draft fan is parallel to the first direction, the heat exchanger 60 is provided with a first air flow passage and a second air flow passage, the first air flow passage is communicated with the air inlet 121 and the air passing port 151, and the second air flow passage is provided with the cold air port 61 and the hot air port 62; the airflow driving module 30 also drives the airflow to flow from the air inlet 121 to the air outlet 101 through the air outlet 151; the first air flow passage and the second air flow passage exchange heat to take away the heat of the second air flow passage. The heat exchanger 60 is attached to the inner surface of the second side wall 12, which is more beautiful than the heat exchanger attached to the outer surface of the second side wall 12, and if the heat exchanger 60 is attached to the outer surface of the second side wall 12, the hot air in the first air flow passage easily flows into the main air intake 111 of the downstream cabinet 10. Since the hot air port 62 is higher than the cold air port 61, the cold air of the heat exchanger 60 can gradually take away the heat of the low-heat-generation component 50 in the heat dissipation cavity 10B in the process of flowing upwards in the heat dissipation cavity 10B, and the air circulation is good.

The heat exchanger 60 and the liquid cooling unit 21 share the airflow driving module 30, so as to share the air outlet 101, so that hot air generated by the heat dissipation cavity 10B is exhausted from the air outlet 101 at the top of the cabinet body 10, and when a plurality of electrical cabinets are used side by side along the first direction, the hot air of the air outlet 101 of the upstream electrical cabinet does not affect the main air inlet 111 of the downstream electrical cabinet.

Wherein the high heat generating component 40 is close to the hot air port 62 and lower than the hot air port 62. Therefore, the cold air flowing out from the cold air inlet 61 of the heat exchanger 60 can take away the heat of the low heat generating component 50 in the heat dissipation cavity 10B, and then take away the heat of the high heat generating component 40, so as to ensure the heat dissipation efficiency of the low heat generating component 50. The high heat generating component 40 is lower than the hot air port 62, so that the resistance is small when hot air flows back, and because the density of hot air in the air flow is smaller than that of air, cold air is downward when the hot air flows back through the high heat generating component 40, and the hot air is upward, so that the heat exchanger 60 can also take away the heat of the high heat generating component 40.

In the present embodiment, the second electrical component 52 is located between the first electrical component 51 and the heat exchanger 60 in the first direction and between the cold air inlet 61 and the hot air inlet 62 in the vertical direction, the high heat generating component 40 is located between the second electrical component 52 and the hot air inlet 62 in the vertical direction, and the electrical plate 521 is adapted to guide the air flow to the first electrical component 51. So set up, make full use of cabinet body 10 along the space of first direction, the overall arrangement of the interior electrical components of heat dissipation chamber 10B of being convenient for, space utilization is high. It will be appreciated that the electrical panel 521 is able to direct the flow of wind to the first electrical member 51, meaning that the electrical panel 521 has a length in the first direction that is able to direct the flow of wind. In other ways, electrical plate 521 may also be perpendicular to the second direction, or inclined with respect to the first direction, or inclined with respect to the second direction. In an embodiment of the electrical plate 521 perpendicular to the second direction, the cold air port 61 and the hot air port 62 of the heat exchanger 60 may be correspondingly opened along the second direction and extend along the vertical direction, at this time, the electrical unit also extends along the second direction, and the electrical unit is also located in the first air passing area 01, and the electrical plate 521 may guide the air flow of the cold air port 61 to the second electrical member 52; in the embodiment where the electrical plate 521 is inclined with respect to the first direction, the electrical plate 521 is inclined with respect to the horizontal plane toward the first side wall 11 or the second side wall 12 from top to bottom, and at this time, the cold air port 61 and the hot air port 62 of the heat exchanger 60 are still opened in the first direction and extend in the second direction, and the electrical unit is still located below the electrical plate 521; in the embodiment in which the electrical plate 521 is inclined with respect to the second direction, the electrical plate 521 is inclined with respect to the vertical surface from top to bottom toward the first abutment wall 13 or the third abutment wall 14, and at this time, both the cold air port 61 and the hot air port 62 of the heat exchanger 60 are opened in the second direction and extend in the vertical direction.

In this embodiment, the electrical plate 521 and the second side wall 12 form an included angle, so that the air current surrounds the second electrical piece 52 and guides the cold air of the cold air inlet 61 to the first electrical piece 51, on one hand, the second electrical piece 52 with larger heat generation is surrounded by the air current, the heat dissipation efficiency is high, and the structure of the second electrical piece 52 is arranged so that the air current in the heat dissipation cavity can be separated by using the structure of the second electrical piece 52, without separately arranging an air guiding structure, part of the air current flows on the surface of the electrical plate 521, and part of the air current flows on the surface of the electrical unit, and the flow speed of the air current closer to the surfaces of the electrical plate 521 and the electrical unit is faster, so that the heat of the second electrical piece 52 can be taken away rapidly; on the other hand, since the first electrical component 51 is close to the first side wall 11 and is far away from the cold air port 61 of the heat exchanger 60, the situation that no air is left easily exists, the electrical plate 521 forms an included angle with the second side wall 12 and guides cold air to the first electrical component 51, so that the first electrical component 51 can pass the air, and the air resistance is smaller due to the flow guiding of the electrical plate 521, therefore, the heat productivity of the first electrical component 51 and the second electrical component 52 does not need to be reduced by reducing the power specifications of the first electrical component 51 and the second electrical component 52, and under the specifications of the existing electrical cabinet, the heat of the first electrical component 51 and the second electrical component 52 is timely taken away through reasonable and ingenious layout, so that the first electrical component 51 and the second electrical component 52 are allowed to have large heat productivity, namely, the first electrical component 51 and the second electrical component 52 are allowed to have large power, and the power density of the electrical cabinet under the same specifications is improved.

Further, the electrical plate 521 extends along the first direction and divides the heat dissipation cavity into a first air passing area 02 corresponding to the cold air port 61 and a second air passing area 03 corresponding to the hot air port 62, and the electrical unit is located in the first air passing area 02, wherein the electrical plate 521 extends along the first direction, the wind resistance is small, and the flow guiding effect is good; since the electric unit is carried on the electric plate 521, the hottest part of the second electric member 52 is the junction between the electric plate 521 and the electric unit, and secondly the electric plate 521, the electric unit is located in the first air passing area 02 corresponding to the air cooling port 61, that is, the area where the second electric member 52 heats seriously is located in the first air passing area 02, so that the heat of the electric unit can be taken away by the air cooling in time, the heat of the junction between the electric unit and the electric plate 521 can be kept in time by the air cooling, and the heat dissipation efficiency of the second electric member 52 is high.

Still further, the electrical plate 521 is horizontally disposed, the first air passing area 02 is located below the electrical plate 521, so that the second electrical plate 52 plays a role of a horizontal partition board in the heat dissipation cavity 10B, since the density of the cold air is greater than that of the hot air, the temperature of the cold air rises to become hot air after passing through the first air passing area 02, so that the cold air flows back to the hot air port 62 through the second air passing area 03, the air flow resistance is small, the circulation is better, and the flow guiding effect of the horizontally disposed electrical plate 521 on the cold air flowing to the first side wall 11 is better, thereby further increasing the air quantity at the first electrical plate 51 and improving the heat dissipation efficiency of the first electrical plate 51.

In this embodiment, the second electrical component 52 is higher than the first supporting surface 161 and is at least partially opposite to the first supporting surface 161, so that an air passing gap is formed between the second electrical component 52 and the first supporting surface 161, and the flow speed of the cold air flowing through the air passing gap is increased, so that the heat dissipation efficiency of the second electrical component 52 is increased, and the heat dissipation efficiency of the first electrical component 51 is also increased.

The cold air port 61 and the hot air port 62 are both perpendicular to the first direction and extend in the second direction, and the hot air port 62 is higher than the cold air port 61, so that the air flow easily flows around the entire second electric piece 52, and the air flow is maximum for the electric plate 521 having the largest heat generation amount and the lower surface of each electric unit, and thus, the heat dissipation efficiency of the second electric piece 52 is higher; the third electric component 53 is close to the air cooling port 61 and is lower than the first supporting surface 161, and because the heat productivity of the third electric component 53 is small, part of cold air flows to the third electric component 53 first, after flowing out of the third electric component 53, the cold air still has lower temperature, the cold air flows upwards and passes through the second electric component 52 and the first electric component 51, and the other part directly flows to the second electric component 52, so that each electric component in the heat dissipation cavity has higher heat dissipation efficiency; wherein the third electric component 53 is lower than the first supporting surface 161, so that the interference to the wind flow flowing to the first electric component 51 is avoided, and a large enough space is formed between the second electric component 52 and the third electric component 53 to facilitate the large wind volume over wind; the wind shielding surface 162 is perpendicular to the first direction and faces the second side wall 12, so that cold air flowing into the wind shielding surface 162 of the heat exchanger 60 collides with the wind shielding surface 162, and part of the cold air flows into a gap between the second electric piece 52 and the first supporting surface 161, so that heat dissipation efficiency is high; therefore, due to the arrangement of the bottom wall of the heat dissipation cavity 10B, different height areas are formed in the heat dissipation cavity 10B, so that the layout of all electric components in the heat dissipation cavity is facilitated, the adjustment of the air quantity and the air speed is realized, and the first electric component 51, the second electric component 52 and the third electric component 53 have higher heat dissipation efficiency; the cooling air duct 01 is arranged to enable cold air to flow into the second electric component 52, so that heat of the second electric component 52 is taken away more quickly, and the cooling efficiency of the second electric component 52 is improved; the heat dissipation air duct 01 further enables the middle part of the electric plate 521 along the first direction to form a cold area, and the wind flow of the cold area flows to two sides respectively, so that the temperature of the electric plate 521 at two sides along the first direction is reduced, the heat dissipation efficiency of the electric plate 521 is greatly improved, the heat accumulation of the second electric piece 52 is avoided, and the service life of the second electric piece 52 is prolonged. The projection of the heat dissipation air duct 01 along the vertical direction is located on the second supporting surface 163, so that the cold air flow colliding with the cold air surface can flow into the heat dissipation air duct 01, and the heat dissipation efficiency of the second electric component 52 is improved.

In this embodiment, the electric components in the heat dissipation cavity 10B mainly dissipate heat through liquid cooling and air cooling, where the high heat generating component 40 dissipates heat through liquid cooling, the liquid cooling heat dissipation mode has high heat dissipation efficiency, the low heat generating components 50 such as the second electric component 52, the first electric component 51 and the third electric component 53 dissipate heat through air cooling, and the heat dissipation efficiency is high, and since the heat exchanger 60 and the heat exchange device 20 dissipate heat through external circulation, the protection of the heat dissipation cavity 10B can be well improved, and it is understood that the heat dissipation cavity 10B is relatively sealed in the scheme, meaning that no air channel penetrating through which may leak air is formed in the heat dissipation cavity 10B, therefore, enough space is provided in the heat dissipation cavity 10B in the scheme for installing the heat generating component, so that the heat generating component is not easily affected by the heat radiation of other electric components, and the layout which is most beneficial to heat dissipation can be formed, thereby improving the heat dissipation efficiency of the heat generating component; in this embodiment, the liquid cooling unit 21 of the heat exchange device 20 is disposed in the air passing cavity 10A at the top, so that the air inlet 121 of the heat exchange device 20 is also located at the top, and the air inlet 121 is far away from the ground, so that the air inlet temperature is lower, so that the heat dissipation efficiency of the liquid cooling unit 21 is high, and the high heat dissipation efficiency of the high heat generating component 40 is ensured; because the liquid cooling unit 21 has no water inlet concern, the air outlet can be arranged at the top of the cabinet body 10, so that heat flow disturbance to a downstream electrical cabinet is not easy to occur when a plurality of electrical cabinets are used in parallel; because the liquid cooling unit 21 is arranged at the top, the side part of the cabinet body 10 is unoccupied, and the parallel operation of a plurality of electrical cabinets is facilitated. It can be seen that, in the present embodiment, the heat dissipation efficiency of the heat generating component in the heat dissipation cavity 10B can be ensured to the maximum extent by the liquid cooling and air cooling combined heat dissipation method, and the heat dissipation cavity 10B has good protection performance; and the parallel operation of the electric cabinets is convenient, and the distance between the power cabinets is also convenient to reduce.

It can be seen that, by adopting the present embodiment, the structure of the second electric component 52 is fully utilized, and by ingenious layout, the heat dissipation efficiency of the second electric component 52 is improved, and the heat dissipation efficiency of the first electric component 51 is also improved, so that the power density is improved, and in addition, an additional air guiding structure or a turbulent fan is not required to be provided, so that the cost is reduced, and the space of the heat dissipation cavity without the air guiding structure or the turbulent fan is increased, so that the power density of the electric cabinet is further improved.

The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.

Claims

1. An electrical cabinet, characterized by comprising

The cabinet body (10) is provided with a heat dissipation cavity (10B), and the heat dissipation cavity (10B) is provided with a first side wall (11) and a second side wall (12) which are parallel and opposite to each other along a first direction;

a heat exchanger (60) provided with a cold air port (61) for feeding cold air to the heat dissipation chamber (10B) and a hot air port (62) for recovering hot air from the heat dissipation chamber (10B) near the second side wall (12);

a first electrical component (51) disposed within the heat dissipation chamber (10B) and adjacent to the first side wall (11); and

a second electrical component (52) disposed within the heat dissipation chamber (10B) and located between the heat exchanger (60) and the first electrical component (51) along a first direction; it further comprises an electrical plate (521) in a plate-like configuration and adapted to carry a number of electrical units, said electrical plate (521) being at an angle to said second side wall (12) such that the wind flow of the cold air port (61) passes said second electrical member (52) and is guided to the first electrical member (51) by the second electrical member (52).

2. An electrical cabinet according to claim 1, wherein the electrical plate member (521) extends in a first direction and divides the heat dissipation chamber (10B) into a first air passing region (02) corresponding to the cold air port (61) and a second air passing region (03) corresponding to the hot air port (62), the electrical unit being located in the first air passing region (02), and the second electrical component (52) having a larger heat generation amount than the first electrical component (51).

3. An electrical cabinet according to claim 2, wherein the electrical panel (521) is arranged horizontally and the first wind passing area (02) is located below the electrical panel (521).

4. A cabinet according to claim 3, characterized in that the bottom wall of the heat dissipation chamber (10B) is provided with a first supporting surface (161) adapted to support the first electrical component (51); the second electrical component (52) is higher than the first bearing surface (161) and is at least partially opposite to the first bearing surface (161).

5. An electrical cabinet according to claim 4, further comprising a third electrical component (53) having a lower heating value than the second electrical component (52); the cold air port (61) and the hot air port (62) are perpendicular to the first direction and extend along a second direction perpendicular to the first direction, and the hot air port (62) is higher than the cold air port (61); the bottom wall of the heat dissipation cavity (10B) is also provided with a wind shielding surface (162) perpendicular to the first direction and a second supporting surface (163) parallel to the first supporting surface (161) towards the second side wall (12), and the upper end and the lower end of the wind shielding surface (162) are respectively connected with the first supporting surface (161) and the second supporting surface (163);

the third electric piece (53) is arranged in the heat dissipation cavity (10B) and is arranged on the second supporting surface (163), is close to the cold air port (61) and is lower than the first supporting surface (161); the second electrical component (52) is also at least partially opposite the second bearing surface (163).

6. An electrical cabinet according to claim 5, wherein each electrical unit is combined in a first direction to form two electrical modules (522), and a heat dissipation air duct (01) extending in a second direction is formed between the two electrical modules (522); the projection of the heat dissipation air duct (01) along the vertical direction is positioned on the second supporting surface (163).

7. An electrical cabinet according to claim 6, further comprising a high heat generating component (40), a heat exchanging device (20) and a wind flow driving module (30); the high-heating element (40) is arranged in the heat dissipation cavity (10B) and is positioned in the second air passing area (03); the top of the cabinet body (10) is provided with an air passing cavity (10A), the heat dissipation cavity (10B) is relatively airtight, and the air passing cavity (10A) is provided with a main air guiding opening (111) and an air exhausting opening (101); the heat exchange device (20) comprises a liquid cooling unit (21) arranged in the air passing cavity (10A) and a liquid cooling plate (22) arranged in the heat dissipation cavity (10B) and used for dissipating heat of the high-heat-generating piece (40), and the liquid cooling unit (21) is communicated with a liquid inlet and a liquid outlet of the liquid cooling plate (22); the wind flow driving module (30) is arranged in the wind passing cavity (10A) and drives wind to flow to the air outlet (101) through the liquid cooling unit (21).

8. An electrical cabinet according to claim 7, wherein the high heat generating element (40) is located above the second electrical element (52), and the liquid cooling plate (22) is parallel to and opposite the electrical plate (521) with an air-passing gap therebetween.

9. An electrical cabinet according to claim 8, wherein said high heat generating component (40) is adjacent to said hot air port (62) and lower than said hot air port (62); the first electric component (51) is a direct current electric component, the second electric component (52) is a capacitor module, the third electric component (53) is an alternating current electric component, and the high-heat-generating component (40) is a power module.

10. An electrical cabinet according to claim 9, wherein the cabinet body (10) is provided with an air passage (151) connected through the air chamber (10A) and the heat dissipation chamber (10B); the main air guiding opening (111) is formed in the first side wall (11), and the air outlet (101) is formed in the top of the cabinet body (10); the heat exchanger (60) is an air heat exchanger and is arranged on the inner surface of the second side wall (12); the second side wall (12) of the heat dissipation cavity (10B) is provided with an air inlet (121); the heat exchanger (60) is provided with a first air flow passage and a second air flow passage, the first air flow passage is communicated with the air inlet (121) and the air outlet (151), and the second air flow passage is provided with the cold air port (61) and the hot air port (62); the wind flow driving module (30) also drives wind to flow from the air inlet (121) to the air outlet (101) through the air passing opening (151); the first air flow passage and the second air flow passage exchange heat to take away the heat of the second air flow passage.