Low-noise air heat exchanger and electrical cabinet

Abstract

The low-noise air heat exchanger comprises a shell, a heat exchange core body, an inner circulating fan and an outer circulating fan, the shell is provided with a containing cavity, an air passing cavity, a partition plate, a first flow dividing piece and a second flow dividing piece, and the containing cavity communicates with the air passing cavity through a first air passing opening and a second air passing opening; the heat exchange core is arranged in the containing cavity, the partition plate is arranged in the air passing cavity and divides the air passing cavity into an air inlet cavity and an air outlet cavity in the second direction, and the first flow dividing piece is arranged in the air inlet cavity and used for changing the air passing area of the air inlet cavity. The second flow dividing piece is arranged in the air outlet cavity and used for changing the air passing area of the air inlet cavity. The electrical cabinet comprises the low-noise air heat exchanger. The low-noise air heat exchanger is low in noise and high in heat exchange efficiency during working.

Description

Technical Field

[0001] The present invention relates to the field of electrical technologies, and particularly to a low-noise air heat exchanger and an electrical cabinet. Background Art

[0002] A large number of electrical devices are usually placed in an electrical cabinet. These electrical devices cannot work in a high-temperature environment for a long time. In order to reduce the impact of external dust on the internal electrical devices, the electrical cabinet mostly uses a closed structure. An air heat exchanger can release the heat inside the electrical cabinet to the external environment through heat exchange. Therefore, an air heat exchanger is mostly used in the electrical cabinet to dissipate heat inside the electrical cabinet. The air heat exchanger is provided with a housing, a heat exchange core, an internal circulation fan, and an external circulation fan. The heat exchange core is placed inside the housing and is provided with an internal circulation air duct and an external circulation air duct that exchange heat with each other. The internal circulation fan drives the air flow in the internal circulation air duct, and the external circulation fan drives the air flow in the external circulation air duct. Most of the internal circulation fan and the external circulation fan will generate a certain amount of noise when working, and the noise generated when the electrical devices in the electrical cabinet are running will also be transmitted outward through the air heat exchanger, resulting in poor user experience. Among them, the housing is provided with an air inlet port and an air outlet port communicating with the outside. The air inlet port and the air outlet port are communicated with the external circulation air duct. The external circulation fan is placed inside the housing and drives the air to flow from the air inlet port to the air outlet port. In order to improve the protection performance, a waterproof louver is often provided at the air inlet port and / or the air outlet port. When the power of the external circulation fan is large or the opening rate of the louver is insufficient, turbulence and vortices will be formed when the air flow is forced to pass through at a high speed, resulting in a large noise and poor user experience. When the size of the air heat exchanger is small, the air inlet port and the air outlet port are relatively close to each other, and the hot air at the air outlet port is easy to flow into the air inlet port, affecting the heat exchange efficiency of the air heat exchanger. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background art, and to provide a low-noise air heat exchanger and an electrical cabinet, the low-noise air heat exchanger of which has low noise and high heat exchange efficiency when working.

[0004] To achieve the above purpose, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical solution one and its related embodiments provide a low-noise air heat exchanger, including a housing, which is provided with a receiving cavity and an air passing cavity. The receiving cavity and the air passing cavity are adjacent along a first direction and are communicated through a first air passing opening and a second air passing opening arranged in a second direction perpendicular to the first direction. A supply air opening and a return air opening are provided on one side of the receiving cavity away from the air passing cavity. An air inlet and an air outlet are provided on the side of the air passing cavity away from the receiving cavity and are arranged in the second direction. The housing is further provided with a partition, a first flow dividing member, and a second flow dividing member. The partition is disposed in the air passing cavity and divides the air passing cavity into an air inlet cavity and an air outlet cavity along the second direction. The air inlet cavity communicates with the first air passing opening and the air inlet, and the air outlet cavity communicates with the second air passing opening and the air outlet. The first flow dividing member is disposed in the air inlet cavity and is used to change the air passing area of the air inlet cavity. The second flow dividing member is disposed in the air outlet cavity and is used to change the air passing area of the air outlet cavity. A heat exchange core body is disposed in the receiving cavity and is provided with an inner circulation air duct and an outer circulation air duct that perform heat exchange with each other. The inner circulation air duct communicates with the supply air opening and the return air opening, and the outer circulation air duct communicates with the first air passing opening and the second air passing opening. An inner circulation fan is fixed relative to the housing and is used to drive air to flow from the return air opening through the inner circulation air duct to the supply air opening. And an outer circulation fan is disposed in the receiving cavity and is used to drive air to flow from the air inlet through the outer circulation air duct to the air outlet.

[0006] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the minimum air passing area in the air inlet cavity is greater than the air passing area of the first air passing opening. The minimum air passing area in the air outlet cavity is greater than the air passing area of the second air passing opening.

[0007] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the first flow dividing member forms a first air inlet duct communicating with the air inlet, a second air inlet duct communicating with the first air passing opening, and a third air inlet duct connecting the first air inlet duct and the second air inlet duct between the first air passing opening and the air inlet. The air passing area of the third air inlet duct is inconsistent with the air passing areas of both the first air inlet duct and the second air inlet duct. The second flow dividing member forms a second air outlet duct communicating with the second air passing opening and a third air outlet duct connecting the first air outlet duct and the second air outlet duct between the second air passing opening and the air outlet. The air passing area of the third air outlet duct is inconsistent with the air passing areas of both the first air outlet duct and the second air outlet duct.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, both the first air inlet duct and the second air inlet duct form an angle with the extending direction of the third air inlet duct. Both the first air outlet duct and the second air outlet duct form an angle with the extending direction of the third air outlet duct. A sound-absorbing layer is fixedly connected to at least one duct wall of each air inlet duct and each air outlet duct.

[0009] Based on Technical Solution Four, there is also Technical Solution Five. In Technical Solution Five and its related embodiments, the two sides of the partition plate facing away from each other respectively form the duct walls of the third air inlet duct and the third air outlet duct; the first flow dividing member is a plate-like structure opposite to the first air passing opening, and the two sides of the first flow dividing member facing away from each other respectively form the duct walls of the first air inlet duct and the second air inlet duct; the second flow dividing member is a plate-like structure opposite to the second air passing opening, and the two sides of the second flow dividing member facing away from each other respectively form the duct walls of the first air outlet duct and the second air outlet duct.

[0010] Based on Technical Solution Five, there is also Technical Solution Six. In Technical Solution Six and its related embodiments, the partition plate is provided with an inclined section, and the inclined section inclines in a direction away from the second air passing opening from one end close to the first side of the air passing cavity along the first direction to the second side of the air passing cavity along the first direction; the first flow dividing member extends along the second direction and its extension line intersects with the inclined section; the air inlet is far from the partition plate.

[0011] Based on Technical Solution Six, there is also Technical Solution Seven. In Technical Solution Seven and its related embodiments, the second direction is the vertical direction; the air outlet is located above the air inlet and on the second side of the air passing cavity along the first direction; the second flow dividing member extends obliquely downward from the top end of the air outlet in a direction close to the second air passing opening and its extension line intersects with the inclined section.

[0012] Based on Technical Solution Seven, there is also Technical Solution Eight. In Technical Solution Eight and its related embodiments, the partition plate is provided with a second section extending along the first direction on the second side of the air passing cavity along the first direction, and the second section is integrally connected with the bottom end of the inclined section; the second section and the air inlet at least partially overlap in the projection plane perpendicular to the second direction, and a water passing opening is provided at the part of the second section corresponding to the air inlet.

[0013] Based on Technical Solution Seven, there is also Technical Solution Nine. In Technical Solution Nine and its related embodiments, drainage openings are respectively provided at the parts of the two sides of the air passing cavity along the third direction corresponding to the partition plate, and the third direction is perpendicular to the first direction and the second direction.

[0014] Technical Solution Ten and its related embodiments provide an electrical cabinet, including a cabinet body and the low-noise air heat exchanger according to any one of Technical Solutions One to Nine. The cabinet body is provided with a first side wall perpendicular to the first direction and extending along the second direction, the outer shell is embedded in the first side wall, and both the air supply opening and the air return opening are located inside the cabinet body, and both the air inlet and the air outlet are located outside the cabinet body.

[0015] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solutions and their preferred embodiments of the present invention have the following beneficial effects due to the following technical means:

[0016] In Technical Solution 1 and its preferred embodiments, the relative fixation of the internal circulation fan to the housing means that the position of the internal circulation fan relative to the housing is relatively fixed. The internal circulation fan can be fixedly connected to the housing, or it can also not be fixedly connected to the housing. The accommodation cavity and the air passing cavity are adjacent along the first direction and are connected through a first air passing opening and a second air passing opening arranged in the second direction perpendicular to the first direction. An air inlet and an air outlet are arranged in the second direction away from the accommodation cavity in the air passing cavity. A partition is placed in the air passing cavity and divides the air passing cavity into an air inlet cavity and an air outlet cavity along the second direction. A first flow dividing member is placed in the air inlet cavity and is used to change the air passing area of the air inlet cavity; a second flow dividing member is placed in the air outlet cavity and is used to change the air passing area of the air outlet cavity, which has the following advantages. First, compared with setting two spaced-apart air inlet cavities and air outlet cavities, it is more conducive to reducing material costs and installation procedures. Second, during the propagation of sound waves in the air cavity, the change in the air passing area of the air cavity will cause impedance mismatch of the sound waves of the noise and generate reflection. The first flow dividing member is used to change the air passing area of the air inlet cavity, and the second flow dividing member is used to change the air passing area of the air outlet cavity, so that the attenuation of the noise can be achieved by increasing the number of reflections of the noise, and the setting of the first flow dividing member also prolongs the propagation path of the sound waves in the air inlet cavity, and the setting of the second flow dividing member also prolongs the propagation path of the sound waves in the air outlet cavity, which can also increase the noise reduction effect. Among them, the air inlet path and the air outlet path in the air passing cavity are isolated from each other, the air flow is not easily disturbed by each other, and the noise is small. Third, the above settings make the air inlet and the first air passing opening far away from each other, and the air flow path between the air inlet and the first air passing opening is further prolonged by the setting of the first flow dividing member and a barrier is formed. The air outlet and the second air passing opening are far away from each other, and the air flow path between the second air passing opening and the air outlet is further prolonged by the setting of the second flow dividing member and a barrier is formed. Therefore, even if there is no waterproof louver at the air inlet and the air outlet, sand, dust, rain and snow are not easily introduced into the first air passing opening through the air inlet, and into the second air passing opening through the air outlet, thus ensuring the protection of the low-noise air heat exchanger. And when there is no need to set a waterproof louver at the air inlet and the air outlet, the noise problem caused by the waterproof louver is also improved. Fourth, the above settings, without increasing the distance between the first air passing opening and the second air passing opening, by making the first air passing opening intake air from the air inlet, making the second air passing opening exhaust air from the air outlet, and making the air inlet and the air outlet far away from the external circulation fan along the first direction, reduce the influence of the external circulation fan on the wind force at the air inlet and the air outlet, so that the hot air flow discharged from the air outlet is not easily introduced into the external circulation channel through the air inlet, avoiding the return of the hot air flow, thereby improving the heat exchange efficiency of the low-noise air heat exchanger. Fifth, the partition can balance the air volume of the air inlet cavity and the air outlet cavity, the first flow dividing member can balance the resistance of different regions in the air inlet cavity, and the second flow dividing member can balance the resistance of different regions in the air outlet cavity, avoiding excessive local resistance, with small overall air resistance, and further ensuring the heat dissipation efficiency of the low-noise air heat exchanger.

[0017] Therefore, the low-noise air heat exchanger of this technical solution can not only greatly reduce noise, providing a good user experience, but also avoid the reflux of hot air currents, and has a high heat dissipation efficiency. During the actual installation process, the accommodation cavity, heat exchange core, internal circulation fan, and external circulation fan can adopt the structures of low-noise air heat exchangers in the prior art. Therefore, only the noise reduction and protection structure formed by the air passage cavity, partition board, first flow dividing member, and second flow dividing member needs to be set, and the modification cost is low.

[0018] In Technical Solution 2 and its preferred embodiments, the minimum air passage area in the air inlet cavity is larger than the air passage area of the first air passage opening, and the minimum air passage area in the air outlet cavity is larger than the air passage area of the second air passage opening. This enables noise to be reflected due to the change in air passage area when it enters the air inlet cavity from the first air passage opening, and also enables noise to be reflected due to the change in air passage area when it enters the air outlet cavity from the second air passage opening. This further increases the reflection of noise, thus improving the noise reduction effect. In addition, it is beneficial to reduce the air resistance of the air flow entering the air outlet from the second air passage opening.

[0019] In Technical Solution 3 and its related embodiments, the air passage area of the third air inlet duct is inconsistent with the air passage areas of the first air inlet duct and the second air inlet duct, and the air passage area of the third air outlet duct is inconsistent with the air passage areas of the first air outlet duct and the second air outlet duct. This enables the attenuation of noise to be further achieved by increasing the number of noise reflections to reach the noise reduction effect. Combining the fact that the minimum air passage area in the air inlet cavity is larger than the air passage area of the first air passage opening, and the minimum air passage area in the air outlet cavity is larger than the air passage area of the second air passage opening, the above settings ensure that the noise undergoes at least three sudden changes in duct area during the process of being transmitted from the first air passage opening to the air inlet and from the second air passage opening to the air outlet. This increases the number of reflections due to the impedance mismatch of the sound waves of the noise, further enhancing the noise attenuation effect. In addition, the setting of multiple air inlet ducts further extends the air flow path between the first air passage opening and the air inlet, and the setting of multiple air outlet ducts extends the air flow path between the second air passage opening and the air outlet. This is not only more conducive to preventing sand, dust, rain, and snow from entering the first air passage opening and the second air passage opening, but also helps to further reduce the impact of the external circulation fan on the wind force at the air inlet and the air outlet, making it difficult for the hot air current discharged from the air outlet to enter the external circulation channel through the air inlet, thus avoiding the reflux of hot air currents, improving the heat exchange efficiency of the low-noise air heat exchanger. In addition, it is beneficial to balance the resistance in different regions of the air inlet cavity and the air outlet cavity, with a small overall air resistance, further ensuring the heat dissipation efficiency of the low-noise air heat exchanger.

[0020] In Technical Solution Four and its preferred embodiments, both the first air inlet duct and the second air inlet duct form an angle with the extending direction of the third air inlet duct. That is, there are two sets of adjacent air inlet ducts whose extending directions form an angle. The noise transmitted from the first air passing opening can be reflected and refracted multiple times after entering the air inlet cavity before passing out through the air inlet opening. This causes the noise to form at least two large turns in the air inlet cavity after entering from the first air passing opening, further increasing the number of reflections and refractions of the noise in the air inlet cavity, thereby further increasing the energy loss of the sound wave and reducing the noise transmitted out through the air inlet opening. In addition, this setting can further prevent rain, snow, sand, and wind from entering the first air passing opening through the air inlet opening, improving the protection performance. Both the first air outlet duct and the second air outlet duct form an angle with the extending direction of the third air outlet duct. That is, there are two sets of adjacent air outlet ducts whose extending directions form an angle. The noise transmitted from the second air passing opening can be reflected and refracted multiple times after entering the air outlet cavity before passing out through the air outlet opening. This causes the noise to form at least two large turns in the air outlet cavity after entering from the second air passing opening, further increasing the number of reflections and refractions of the noise in the air outlet cavity, thereby further increasing the energy loss of the sound wave and reducing the noise transmitted out through the air outlet opening. In addition, this setting can further prevent rain, snow, sand, and wind from entering the second air passing opening through the air outlet opening, improving the protection performance. An acoustic absorption layer is fixedly connected to at least one duct wall of each air inlet duct and each air outlet duct. The setting of the acoustic absorption layer can absorb the noise, further reducing the noise.

[0021] In Technical Solution Five and its preferred embodiments, the two sides of the partition that face away from each other respectively form the duct walls of the third air inlet duct and the third air outlet duct. The first flow dividing member is a plate-like structure opposite to the first air passing opening, and the two sides of it that face away from each other respectively form the duct walls of the first air inlet duct and the second air inlet duct; the second flow dividing member is a plate-like structure opposite to the second air passing opening, and the two sides of it that face away from each other respectively form the duct walls of the first air outlet duct and the second air outlet duct. On the one hand, this setting enables the structures of the first flow dividing member and the second flow dividing member to be plate-like. By adjusting the positions and extending directions of the first flow dividing member and the second flow dividing member, three air inlet ducts and three air outlet ducts can be formed, and the extending directions of two sets of adjacent air inlet ducts form an angle, and the extending directions of two sets of adjacent air outlet ducts form an angle. The structure is simpler, so that three air inlet ducts can be formed in the air inlet cavity and three air outlet ducts can be formed in the air outlet cavity with the least modification. On the other hand, it makes the space in the air inlet cavity basically used to form the air inlet ducts, and the space in the air outlet cavity basically used to form the air outlet ducts. Each air inlet duct and each air outlet duct can have a relatively large air passing area, so that when the air passes through the air inlet ducts and the air outlet ducts, there is a relatively small air resistance, avoiding the situation of excessive air resistance caused by the increase in the length of the air ducts, which is not conducive to air inlet and air outlet.

[0022] In addition, the above settings also have better effects on noise attenuation and protection. On the one hand, since the first shunt member is opposite to the first air inlet, and the second shunt member is opposite to the second air inlet, when noise enters the second air inlet duct from the first air inlet, it is reflected and refracted by the first shunt member, and when noise enters the second air outlet duct from the second air inlet, it is reflected and refracted by the second shunt member. In this way, during the process of noise from the first air inlet to the air inlet, it undergoes at least three large turns, and during the process of noise from the second air inlet to the air outlet, it also undergoes at least three large turns. The number of reflections and refractions is more, and the noise attenuation effect is better. Similarly, when rain, snow, wind and sand enter, they also undergo multiple impacts and decelerations, and the protection performance is better. On the other hand, after the first air inlet duct, the third air inlet duct and the second air inlet duct are connected, they basically form a U-shaped air duct structure, and after the first air outlet duct, the third air outlet duct and the second air outlet duct are connected, they also basically form a U-shaped air duct structure. When noise propagates, the turning angle is larger, so that the noise can be better reflected and refracted after entering the air inlet cavity from the first air inlet, and the noise can also be better reflected and refracted after entering the air outlet cavity from the second air inlet. The noise attenuation effect is better, and the protection effect against rain, snow, wind and sand is also better.

[0023] In Technical Solution Six and its preferred embodiments, the partition plate is provided with an inclined section, and the inclined section inclines from one end close to the first side of the air inlet cavity along the first direction to the direction away from the second air inlet in the direction of the second side of the air inlet cavity along the first direction. On the one hand, the partition plate can make the air duct areas of the third air inlet duct and the third air outlet duct continuously change in the part corresponding to the inclined section, thereby further increasing the number of reflections due to the impedance mismatch of the sound waves of the noise, and further increasing the noise attenuation effect. On the other hand, the setting of the inclined section is also beneficial to guiding the air flow entering from the air inlet to the second air inlet duct and then entering the first air inlet, and guiding the air flow of the second air inlet to the first air outlet duct and then entering the air outlet, with smaller air resistance.

[0024] The first shunt member extends along the second direction and its extension line intersects with the inclined section. The air inlet is far from the partition plate. On the one hand, it is beneficial to make the air passing area of the third air inlet duct inconsistent with the air passing areas of the first air inlet duct and the second air inlet duct by controlling the length of the first shunt member along the second direction. On the other hand, the extension of the first shunt member along the second direction makes the first air inlet duct and the second air inlet duct basically perpendicular to the third air inlet duct, which is more conducive to being reflected and refracted during the process of being transmitted from the first air inlet to the air inlet, thereby being beneficial to increasing the noise attenuation and reducing the noise, and also more conducive to preventing rain, snow, wind and sand from entering the first air inlet through the air inlet, improving the protection performance.

[0025] In Technical Solution VII and its preferred embodiments, the second flow divider extends obliquely downward from the top end of the air outlet towards the direction close to the second air passing opening, and its extension line intersects with the inclined section. On the one hand, it is beneficial to make the air passing area of the third air duct inconsistent with the air passing areas of the first air duct and the second air duct, and make the air passing areas of the first air duct and the third air duct also gradually change, further increasing the number of noise reflections and enhancing the noise attenuation effect. On the other hand, the inclined direction of the second flow divider is more conducive to reflecting the noise at the second air passing opening back to the second air passing opening, rather than reflecting it out of the air outlet, resulting in a better noise attenuation effect. More preferably, the inclined direction of the second flow divider is also conducive to guiding the air flow at the air outlet upward, thus avoiding the short circuit of the hot air flow at the air outlet entering the air inlet.

[0026] In Technical Solution VIII and its preferred embodiments, since the second section is integrally connected to the bottom end of the inclined section, even if water, rain or snow enters the air outlet, the rain and snow in the air outlet cavity will fall on the partition under the action of gravity, part of which slides down to the second section through the inclined section, and part directly falls on the second section. The projection of the second section on the projection plane perpendicular to the second direction at least partially overlaps with the air inlet, and a water passing opening is provided at the part of the second section corresponding to the air inlet. Thus, the rain and snow on the second section can be directly discharged through the air inlet, enabling the air inlet to integrate the functions of drainage and air intake, and making the processing simpler.

[0027] In Technical Solution IX and its preferred embodiments, drainage openings are respectively provided at the parts of both sides of the air passing cavity corresponding to the partition along the third direction, which is beneficial to discharging the rain and snow in the air outlet cavity. And since the air inlet is close to the second side of the air passing cavity along the first direction, the above setting makes the drainage openings far away from the air inlet, avoiding the discharged rain and snow being sucked into the air inlet.

[0028] Technical Solution X and its preferred embodiments have the technical advantages of any one of Technical Solutions I to IX. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic diagram of the electrical cabinet according to the embodiment of the present application;

[0031] Figure 2 It is a top view of the low-noise air heat exchanger according to the embodiment of the present application;

[0032] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction;

[0033] Figure 4 This is a side view of the low-noise air heat exchanger according to an embodiment of the present application;

[0034] Figure 5 is Figure 4 a sectional view taken along the B-B direction;

[0035] Figure 6 for another embodiment of the present application Figure 2 a sectional view taken along the A-A direction.

[0036] Description of main reference numerals:

[0037] Cabinet 100; First side wall 101; Low-noise air heat exchanger 200; Outer shell 10; Accommodation cavity 11; Air supply opening 111; Air return opening 112; First interval 113; Second interval 114; Noise reduction and protection structure 20; Air passing cavity 21; First air passing opening 211; Second air passing opening 212; Air inlet 213; Air outlet 214; Partition 22; First section 221; Second section 222; Water passing opening 2221; Inclined section 223; First flow dividing member 23; Second flow dividing member 24; Sound absorption layer 25; Air inlet cavity 26; Air outlet cavity 27; Drainage opening 28; First air inlet duct 01; Second air inlet duct 02; Third air inlet duct 03; First air outlet duct 04; Second air outlet duct 05; Third air outlet duct 06; Heat exchange core 30; Inner circulation fan 40; Outer circulation fan 50. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0039] In the claims, the description and the above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., are all used to distinguish different objects and not for describing a specific order.

[0040] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation terms, such as the use of terms "center", "horizontal", "vertical", "level", "vertical", "top", "bottom", "inner", "outer", "up", "down", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship are based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the specific protection scope of the present invention.

[0041] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, if the terms "fixed connection" or "fixedly connected" are used, they should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrally connected and being fixedly connected through other devices or elements.

[0042] In the claims, description and above-mentioned drawings of the present invention, if the terms "comprise", "have" and their variants are used, they are intended to mean "including but not limited to".

[0043] See Figure 1 , Figure 1 , which shows an electrical cabinet, including a cabinet body 100 and a low-noise air heat exchanger 200. In actual application, the electrical cabinet further includes electrical equipment placed in the cabinet body 100. The interior of the cabinet body 100 forms a closed structure to improve the protection of the electrical equipment. The low-noise air heat exchanger 200 is installed on the cabinet body 100 and is used for dissipating heat from the electrical equipment. The cabinet body 100 is generally in the shape of a cuboid, and the cabinet body 100 is provided with a first side wall 101 perpendicular to the first direction and extending along a second direction perpendicular to the first direction.

[0044] See Figure 2-3 , Figure 2 which shows a top view of the low-noise air heat exchanger 200, Figure 3 which shows a cross-sectional view of the low-noise air heat exchanger 200. The low-noise air heat exchanger 200 includes a housing 10, a heat exchange core 30, an internal circulation fan 40 and an external circulation fan 50. Figure 1 In, the housing 10 is embedded in the first side wall 101 and enables the low-noise air heat exchanger 200 to be installed on the cabinet body 100.

[0045] See Figure 3, the housing 10 is provided with a receiving cavity 11 and an air passing cavity 21. The receiving cavity 11 and the air passing cavity 21 are adjacent along a first direction and are communicated through a first air passing opening 211 and a second air passing opening 212 arranged along a second direction. On one side of the receiving cavity 11 away from the air passing cavity 21, an air supply opening 111 and an air return opening 112 are provided. On the side of the air passing cavity 21 away from the receiving cavity 11, an air inlet 213 and an air outlet 214 are arranged along the second direction. The housing 10 is further provided with a partition 22, a first flow dividing member 23, a second flow dividing member 24 and a sound absorption layer 25 disposed in the air passing cavity 21. The air passing cavity 21, the partition 22, the first flow dividing member 23, the second flow dividing member 24 and the sound absorption layer 25 form a noise reduction protection structure 20.

[0046] See Figure 2-3 , the air passing cavity 21 is integrally in the shape of a cuboid. Its width direction is the first direction, its height direction is the second direction, and its length direction is the third direction. The first direction, the second direction and the third direction are orthogonal. The partition 22 is disposed in the air passing cavity 21 and divides the air passing cavity 21 into an air inlet cavity 26 and an air outlet cavity 27 along the second direction. The air inlet cavity 26 communicates the first air passing opening 211 and the air inlet 213, and the air outlet cavity 27 communicates the second air passing opening 212 and the air outlet 214. In this embodiment, the second direction is the vertical direction. The first air passing opening 211 and the second air passing opening 212 are respectively located at the lower end and the upper end of the first side of the air passing cavity 21. The air outlet 214 is located above the air inlet 213 and on the second side of the air passing cavity 21 along the first direction. Figure 3 , the air outlet 214 is located at the upper end of the air passing cavity 21, and the air inlet 213 is located at the bottom end of the air passing cavity 21 and is formed on the bottom surface of the air passing cavity 21 and the side surface of the second side of the air passing cavity 21, so that the air inlet 213 is far away from the partition 22. It should be understood that in other embodiments, the air inlet 213 may also be formed only on the bottom surface or the side surface of the second side of the air passing cavity 21. Exemplarily, the partition 22 is integrally in the shape of a Z. It is provided with a first section 221 and a second section 222 extending along the first direction and an inclined section 223 connecting the first section 221 and the second section 222. The inclined section 223 inclines from one end close to the first side of the air passing cavity 21 along the first direction to the direction close to the second side of the air passing cavity 21 along the first direction and away from the second air passing opening 212. Figure 3 , the second section 222 is located on the right side and below the first section 221. The inclined section 223 inclines from left to right and downward. That is, the partition 22 is provided with a second section 222 extending along the first direction on the side close to the second side of the air passing cavity 21 along the first direction. The second section 222 is integrally connected to the bottom end of the inclined section 223. The projection of the second section 222 and the air inlet 213 on the projection plane perpendicular to the second direction at least partially overlaps. See Figure 4-5 , Figure 4 is a side view of the low-noise air heat exchanger 200. Figure 5 is Figure 4The cross-sectional view shows that the length of the air passage cavity 21 in the first direction is greater than the length of the accommodation cavity 11 in the third direction. The length of the first section 221 in the third direction is greater than the length of the accommodation cavity 11 in the third direction. The first section 221 is in the shape of a groove with an opening facing the accommodation cavity 11, and the cavity wall of the accommodation cavity 11 is embedded in the groove formed by the first section 221. The part of the second section 222 corresponding to the air inlet 213 is provided with a water passage port 2221. In another embodiment, refer to Figure 6 , drainage ports 28 are respectively provided at the parts of the two sides of the air passage cavity 21 corresponding to the partition plate 22 in the third direction. It should be understood that in other embodiments, the partition plate 22 can also be of other shapes, such as a broken line shape, an arc shape or a structure formed by other curved sections. In this embodiment, the two sides of the partition plate 22 facing away from each other respectively form the air passage walls of the third air inlet passage 03 and the third air outlet passage 06 described below.

[0047] The first flow dividing member 23 is placed in the air inlet cavity 26 and is used to change the air passage area of the air inlet cavity 26. The first flow dividing member 23 forms at least two air inlet passages with included angles in the extending directions between the air inlet 213 and the first air passage port 211. In this embodiment, each air inlet passage is respectively a first air inlet passage 01 communicating with the air inlet 213, a second air inlet passage 02 communicating with the first air passage port 211, and a third air inlet passage 03 connecting the first air inlet passage 01 and the second air inlet passage 02. The extending directions of the first air inlet passage 01 and the second air inlet passage 02 are both at an included angle with the extending direction of the third air inlet passage 03. In this embodiment, the first air inlet passage 01 and the second air inlet passage 02 are both directly connected to the third air inlet passage 03. However, it should be understood that the first air inlet passage 01 and the third air inlet passage 03, as well as the second air inlet passage 02 and the third air inlet passage 03, can also be indirectly connected, such as through a transitional air passage. In this embodiment, the first flow dividing member 23 is a plate-like structure opposite to the first air passage port 211, and the projection of the first flow dividing member 23 on the projection plane perpendicular to the first direction covers the first air passage port 211. The two sides of the first flow dividing member 23 facing away from each other respectively form the air passage walls of the first air inlet passage 01 and the second air inlet passage 02. The first flow dividing member 23 extends in the second direction and its extension line intersects with the inclined section 223. Among them, the air passage area of the third air inlet passage 03 is not the same as the air passage areas of both the first air inlet passage 01 and the second air inlet passage 02. In this embodiment, the minimum air passage area in the air inlet cavity 26 is greater than the air passage area of the first air passage port 211, that is, the air passage areas of each air inlet passage are greater than the air passage area of the first air passage port 211. Among them, the adjustment of the air passage area of each air inlet passage can be adjusted by the length and position of the first flow dividing member 23, or can be adjusted by adjusting the size of the air passage cavity 21. As described above, the length of the air passage cavity 21 in the third direction is greater than the length of the accommodation cavity 11 in the third direction. It should be understood that in this embodiment, although only the embodiment in which the first flow dividing member 23 is a plate-like structure is shown, those skilled in the art can understand that the first flow dividing member 23 can be formed by connecting a plurality of bent sections.

[0048] The second flow divider 24 is disposed in the air outlet cavity 27 and is used to change the air passing area of the air outlet cavity 27. The second flow divider 24 forms at least two air outlet channels with an included angle in the extending directions between the second air passing opening 212 and the air outlet 214. Each air outlet channel is respectively a first air outlet channel 04 communicating with the air outlet 214, a second air outlet channel 05 communicating with the second air passing opening 212, and a third air outlet channel 06 connecting the first air outlet channel 04 and the second air outlet channel 05; both the first air outlet channel 04 and the second air outlet channel 05 form an included angle with the extending direction of the third air outlet channel 06. In this embodiment, both the first air outlet channel 04 and the second air outlet channel 05 are directly connected to the third air outlet channel 06, but it should be understood that the first air outlet channel 04 and the third air outlet channel 06 as well as the second air outlet channel 05 and the third air outlet channel 06 can also be indirectly connected, such as being connected through a transitional air duct. In this embodiment, the second flow divider 24 is a plate-like structure opposite to the second air passing opening 212. The projection of the second flow divider 24 on the projection plane perpendicular to the first direction covers the second air passing opening 212. The air duct walls of the first air outlet channel 04 and the second air outlet channel 05 are respectively formed on the two sides of the second flow divider 24 facing away from each other. The second flow divider 24 extends obliquely downward from the top end of the air outlet 214 towards the direction close to the second air passing opening 212, and its extension line intersects with the inclined section 223. The air passing area of the third air outlet channel 06 is inconsistent with both the air passing area of the first air outlet channel 04 and the air passing area of the second air outlet channel 05; in this embodiment, the minimum air passing area in the air outlet cavity 27 is larger than the air passing area of the second air passing opening 212, that is, the air passing area of each air outlet channel is larger than the air passing area of the second air passing opening 212. Among them, the adjustment of the air passing area of each air outlet channel can be adjusted by the length and position of the second flow divider 24, or can also be adjusted by adjusting the size of the air passing cavity 21. It should be understood that in this embodiment, although only the implementation manner in which the second flow divider 24 is a plate-like structure is shown, those skilled in the art can understand that the second flow divider 24 can be formed by connecting a plurality of bent sections.

[0049] In this embodiment, a sound-absorbing layer 25 is fixedly connected to at least one air duct wall of each air inlet duct and each air outlet duct. Figure 3 In, sound-absorbing cotton is fixedly connected to the two sides of the partition 22 facing away from each other, the two sides of the first flow divider 23 facing away from each other, the side of the second flow divider 24 facing the second air passing opening 212, the top wall, the bottom wall of the air passing cavity 21, the side wall of the second side of the air passing cavity 21, and the side walls of the two sides of the air passing cavity 21 along the third direction to form a sound-absorbing layer 25. Fixing the sound-absorbing layer 25 at the above positions can obtain a good noise reduction effect at a lower cost, but it should be understood that the sound-absorbing layer 25 can be fixedly connected to the air duct walls of each air inlet duct and each air outlet duct to obtain a better noise reduction effect.

[0050] Still referring to Figure 3, the accommodation cavity 11 and the air passing cavity 21 are adjacent along the first direction and are communicated through the first air passing opening 211 and the second air passing opening 212; the accommodation cavity 11 is also in a cuboid shape as a whole and shares a side wall with the air passing cavity 21. An air supply opening 111 and an air return opening 112 are provided on one side of the accommodation cavity 11 away from the air passing cavity 21. After the low-noise air heat exchanger 200 is installed in the cabinet 100, both the air supply opening 111 and the air return opening 112 are located inside the cabinet 100, and the air inlet 213 and the air outlet 214 are both located outside the cabinet 100.

[0051] The heat exchange core 30 belongs to the prior art. It is placed in the accommodation cavity 11 and is provided with an inner circulation air duct and an outer circulation air duct that conduct heat exchange with each other. Exemplarily, the number of the inner circulation air ducts and the outer circulation air ducts is multiple, and each inner circulation air duct and each outer circulation air duct are alternately arranged along the third direction. The inner circulation air duct communicates the air supply opening 111 and the air return opening 112, and the outer circulation air duct communicates the first air passing opening 211 and the second air passing opening 212. Both ends of the heat exchange core 30 along the second direction respectively form a first interval 113 communicated with the first air passing opening 211 and a second interval 114 communicated with the second air passing opening 212.

[0052] The inner circulation fan 40 is fixed relative to the outer shell 10 and is used to drive air to flow from the air return opening 112 to the air supply opening 111. The inner circulation fan 40 being fixed relative to the outer shell 10 means that the position of the inner circulation fan 40 is relatively fixed with respect to the outer shell 10. The inner circulation fan 40 can be fixedly connected to the outer shell 10 or not fixedly connected to the outer shell 10. Exemplarily, in this embodiment, the inner circulation fan 40 is fixedly connected to the outer shell 10 and is installed at the air supply opening 111. The inner circulation fan 40 can drive air to flow from the air return opening 112 through the inner circulation air duct to the air supply opening 111 so as to dissipate heat inside the cabinet 100.

[0053] The outer circulation fan 50 is placed in the accommodation cavity 11 and is used to drive air to flow from the air inlet 213 through the outer circulation air duct to the air outlet 214. In this embodiment, the outer circulation fan 50 is installed in the second interval 114. The outer circulation fan 50 drives air to enter the first interval 113 from the air inlet 213 through the first air inlet duct 01, the third air inlet duct 03, the second air inlet duct 02, and the first air passing opening 211, and then is discharged from the air outlet 214 through the outer circulation air duct, the second interval 114, the second air passing opening 212, the second air outlet duct 05, the third air outlet duct 06, and the first air outlet duct 04. The noises of the inner circulation fan 40, the outer circulation fan 50, and the electrical equipment inside the cabinet 100 are transmitted to the air inlet 213 through the first air passing opening 211 and are transmitted to the air outlet 214 through the second air passing opening 212.

[0054] In this embodiment, the accommodation cavity 11 and the air passage cavity 21 are adjacent along the first direction and are communicated through a first air passage opening 211 and a second air passage opening 212 arranged in the second direction perpendicular to the first direction. The air passage cavity 21 is provided with an air inlet 213 and an air outlet 214 arranged in the second direction away from the accommodation cavity 11. A partition 22 is placed in the air passage cavity 21 and divides the air passage cavity 21 into an air inlet cavity 26 and an air outlet cavity 27 along the second direction. A first flow dividing member 23 is placed in the air inlet cavity 26 and is used to change the air passage area of the air inlet cavity 26; a second flow dividing member 24 is placed in the air outlet cavity 27 and is used to change the air passage area of the air outlet cavity 27, which has the following advantages. First, compared with arranging two spaced-apart air inlet cavities 26 and air outlet cavities 27, it is more conducive to reducing material costs and installation procedures. Second, during the propagation of sound waves in the air cavity, the change in the air passage area of the air cavity will cause impedance mismatch of the noise sound waves and generate reflection. The first flow dividing member 23 is used to change the air passage area of the air inlet cavity 26, and the second flow dividing member 24 is used to change the air passage area of the air outlet cavity 27, so that the attenuation of noise can be achieved by increasing the number of reflections of the noise, and the setting of the first flow dividing member 23 also extends the propagation path of the sound waves in the air inlet cavity 26, and the setting of the second flow dividing member 24 also extends the propagation path of the sound waves in the air outlet cavity 27, which can also increase the noise reduction effect; wherein the air inlet path and the air outlet path in the air passage cavity 21 are isolated from each other, the air flow is not easily interfered with each other, and the noise is small. Third, the above settings make the air inlet 213 and the first air passage opening 211 far away from each other, and the setting of the first flow dividing member 23 further extends the air flow path between the air inlet 213 and the first air passage opening 211 and forms a barrier. The air outlet 214 and the second air passage opening 212 are far away from each other, and the setting of the second flow dividing member 24 further extends the air flow path between the second air passage opening 212 and the air outlet 214 and forms a barrier. Therefore, even if there is no waterproof louver at the air inlet 213 and the air outlet 214, sand, dust, rain and snow are not easily introduced into the first air passage opening 211 through the air inlet 213 and into the second air passage opening 212 through the air outlet 214, thus ensuring the protection of the low-noise air heat exchanger 200, and when there is no need to set a waterproof louver at the air inlet 213 and the air outlet 214, the noise problem caused by the waterproof louver is also improved. Fourth, the above settings, without increasing the distance between the first air passage opening 211 and the second air passage opening 212, make the first air passage opening 211 intake air from the air inlet 213, the second air passage opening 212 exhaust air from the air outlet 214, and the air inlet 213 and the air outlet 214 are far away from the external circulation fan along the first direction, reducing the influence of the external circulation fan on the wind force at the air inlet 213 and the air outlet 214, making the hot air flow discharged from the air outlet 214 not easily enter the external circulation channel through the air inlet 213, avoiding the reflux of the hot air flow, and thus improving the heat exchange efficiency of the low-noise air heat exchanger;Fifth, the partition plate can balance the air volume of the air inlet chamber 26 and the air outlet chamber 27. The first flow dividing member 23 can balance the resistance in different regions of the air inlet chamber 26, and the second flow dividing member 24 can balance the resistance in different regions of the air outlet chamber 27, avoiding excessive local resistance and having a small overall air resistance, and further ensuring the heat dissipation efficiency of the low-noise air heat exchanger 200.;

[0055] Therefore, the low-noise air heat exchanger of this technical solution can not only greatly reduce noise and provide a good user experience, but also avoid the backflow of hot air, and has a high heat dissipation efficiency of the low-noise air heat exchanger 200. During the actual installation process, the accommodation cavity 11, the heat exchange core 30, the internal circulation fan 40, and the external circulation fan 50 can be the structures of the low-noise air heat exchanger using the existing technology. Therefore, only the noise reduction and protection structure 20 formed by the air passage cavity 21, the partition plate 22, the first flow dividing member 23, and the second flow dividing member 24 needs to be set, and the modification cost is low.

[0056] In this embodiment, the minimum air passage area in the air inlet chamber 26 is larger than the air passage area of the first air passage opening 211, and the minimum air passage area in the air outlet chamber 27 is larger than the air passage area of the second air passage opening 212, so that when the noise enters the air inlet chamber 26 from the first air passage opening 211, reflection can occur due to the change in the air passage area, and when the noise enters the air outlet chamber 27 from the second air passage opening 212, reflection can occur due to the change in the air passage area, further increasing the reflection of the noise and thus improving the noise reduction effect. In addition, it is also beneficial to reduce the air resistance of the air flow entering the air outlet 214 from the second air passage opening 212.

[0057] In this embodiment, the air passing area of the third air inlet duct 03 is inconsistent with the air passing areas of the first air inlet duct 01 and the second air inlet duct 02, and the air passing area of the third air outlet duct 06 is inconsistent with the air passing areas of the first air outlet duct 04 and the second air outlet duct 05. This enables further attenuation of noise by increasing the number of noise reflection times to achieve a noise reduction effect. Considering that the minimum air passing area in the air inlet cavity 26 is larger than the air passing area of the first air passing opening 211, and the minimum air passing area in the air outlet cavity 27 is larger than the air passing area of the second air passing opening 212, the above settings ensure that during the process of noise transmission from the first air passing opening 211 to the air inlet 213 and from the second air passing opening 212 to the air outlet 214, the noise experiences at least three sudden changes in the air duct area. This increases the number of reflections due to the impedance mismatch of the noise sound waves, further enhancing the noise attenuation effect. Additionally, the arrangement of multiple air inlet ducts further extends the air flow path between the first air passing opening 211 and the air inlet 213, and the arrangement of multiple air outlet ducts extends the air flow path between the second air passing opening 212 and the air outlet 214. This not only helps prevent sand, dust, rain, and snow from entering the first air passing opening 211 and the second air passing opening 212, but also further reduces the impact of the external circulation fan 50 on the air flow at the air inlet 213 and the air outlet 214, preventing the hot air flow discharged from the air outlet 214 from entering the external circulation channel through the air inlet 213 and avoiding hot air flow backflow. This improves the heat exchange efficiency of the low-noise air heat exchanger 200. Moreover, it helps balance the resistance in different regions of the air inlet cavity 26 and the air outlet cavity 27, with a small overall air resistance, further ensuring the heat dissipation efficiency of the low-noise air heat exchanger 200.

[0058] In this embodiment, both the first air inlet duct 01 and the second air inlet duct 02 form an angle with the extending direction of the third air inlet duct 03, that is, the extending directions of two groups of adjacent air inlet ducts form an angle. The noise transmitted from the first air passing opening 211 can be reflected and refracted multiple times after entering the air inlet cavity 26 and then transmitted out through the air inlet 213, so that the noise forms at least two large turns in the air inlet cavity 26 after entering the air inlet cavity 26 from the first air passing opening 211, further increasing the number of reflections and refractions of the noise in the air inlet cavity 26, thereby further increasing the energy loss of the sound wave and reducing the noise transmitted out through the air inlet 213. In addition, this setting can further prevent rain, snow, wind and sand from entering the first air passing opening 211 through the air inlet 213, improving the protection performance. Both the first air outlet duct 04 and the second air outlet duct 05 form an angle with the extending direction of the third air outlet duct 06, that is, the extending directions of two groups of adjacent air outlet ducts form an angle. The noise transmitted from the second air passing opening 212 can be reflected and refracted multiple times after entering the air outlet cavity 27 and then transmitted out through the air outlet 214, so that the noise forms at least two large turns in the air outlet cavity 27 after entering the air outlet cavity 27 from the second air passing opening 212, further increasing the number of reflections and refractions of the noise in the air outlet cavity 27, thereby further increasing the energy loss of the sound wave and reducing the noise transmitted out through the air outlet 214. In addition, this setting can further prevent rain, snow, wind and sand from entering the second air passing opening 212 through the air outlet 214, improving the protection performance. A sound-absorbing layer 25 is fixedly connected to at least one duct wall of each air inlet duct and each air outlet duct. The setting of the sound-absorbing layer 25 can absorb the noise, further reducing the noise.

[0059] In this embodiment, the two sides of the partition 22 facing away from each other respectively form the duct walls of the third air inlet duct 03 and the third air outlet duct 06. The first flow dividing member 23 is a plate-like structure opposite to the first air passing opening 211, and the two sides of it facing away from each other respectively form the duct walls of the first air inlet duct 01 and the second air inlet duct 02; the second flow dividing member 24 is a plate-like structure opposite to the second air passing opening 212, and the two sides of it facing away from each other respectively form the duct walls of the first air outlet duct 04 and the second air outlet duct 05. On the one hand, this setting enables the structures of the first flow dividing member 23 and the second flow dividing member 24 to be plate-like. By adjusting the positions and extending directions of the first flow dividing member 23 and the second flow dividing member 24, three air inlet ducts and three air outlet ducts can be formed, and the extending directions of two groups of adjacent air inlet ducts form an angle, and the extending directions of two groups of adjacent air outlet ducts form an angle, with a simpler structure. Thus, three air inlet ducts can be formed in the air inlet cavity 26 and three air outlet ducts can be formed in the air outlet cavity 27 with the least modification; on the other hand, it enables the space in the air inlet cavity 26 to be basically used to form the air inlet ducts, and the space in the air outlet cavity 27 to be basically used to form the air outlet ducts. Each air inlet duct and each air outlet duct can have a larger air passing area, so that there is a smaller air resistance when the air passes through the air inlet ducts and the air outlet ducts, avoiding the situation that the air resistance is too large due to the increase of the duct length, which is not conducive to air inlet and air outlet.

[0060] In addition, the above settings also have better effects on noise attenuation and protection. On the one hand, since the first shunt member 23 is opposite to the first air inlet 211 and the second shunt member 24 is opposite to the second air inlet 212, when noise enters the second air inlet duct 02 from the first air inlet 211, it is reflected and refracted by the first shunt member 23, and when noise enters the second air outlet duct 05 from the second air inlet 212, it is reflected and refracted by the second shunt member 24. In this way, during the process of noise from the first air inlet 211 to the air inlet 213, it undergoes at least three large turns, and during the process of noise from the second air inlet 212 to the air outlet 214, it also undergoes at least three large turns, with more reflection and refraction times, resulting in better noise attenuation effect. Similarly, when rain, snow, wind, and sand enter, they also undergo multiple impacts and decelerations, providing better protection. On the other hand, after the first air inlet duct 01, the third air inlet duct 03, and the second air inlet duct 02 are connected, they basically form a U-shaped air duct structure, and after the first air outlet duct 04, the third air outlet duct 06, and the second air outlet duct 05 are connected, they also basically form a U-shaped air duct structure. When noise propagates, the turning angle is larger, so that the noise can be better reflected and refracted after entering the air inlet cavity 26 from the first air inlet 211, and the noise can also be better reflected and refracted after entering the air outlet cavity 27 from the second air inlet 212, resulting in better noise attenuation effect and better protection effect against rain, snow, wind, and sand.

[0061] In this embodiment, the partition 22 is provided with an inclined section 223, and the inclined section 223 inclines from one end on the first side along the first direction close to the air passage cavity 21 to the direction away from the second air inlet 212 towards the second side along the first direction close to the air passage cavity 21. On the one hand, the partition 22 can make the air duct areas of the third air inlet duct 03 and the third air outlet duct 06 continuously change in the part corresponding to the inclined section 223, thereby further increasing the number of reflections due to the impedance mismatch of the sound waves of the noise, and further increasing the noise attenuation effect. On the other hand, the setting of the inclined section 223 is also beneficial for guiding the air flow entering from the air inlet 213 to the second air inlet duct 02 and then entering the first air inlet 211, and guiding the air flow of the second air inlet 212 to the first air outlet duct 04 and then entering the air outlet 214, with smaller air resistance.

[0062] In this embodiment, the first flow divider 23 extends along the second direction and its extension line intersects with the inclined section 223. The air inlet 213 is far from the partition 22. On the one hand, it is beneficial to make the air passing area of the third air inlet duct 03 different from the air passing areas of the first air inlet duct 01 and the second air inlet duct 02 by controlling the length of the first flow divider 23 along the second direction. On the other hand, the extension of the first flow divider 23 along the second direction makes the first air inlet duct 01 and the second air inlet duct 02 substantially perpendicular to the third air inlet duct 03, which is more conducive to reflection and refraction during the process of transmitting from the first air passing opening 211 to the air inlet 213. Therefore, it is beneficial to increase the attenuation of noise and reduce the noise, and it is also more conducive to preventing rain, snow, sand and dust from entering the first air passing opening 211 through the air inlet, improving the protection performance.

[0063] In this embodiment, the second flow divider 24 extends obliquely downward from the top of the air outlet 214 towards the second air passing opening 212 and its extension line intersects with the inclined section 223. On the one hand, it is beneficial to make the air passing area of the third air outlet duct 06 different from the air passing areas of the first air outlet duct 04 and the second air outlet duct 05, and make the air passing areas of the first air outlet duct 04 and the third air outlet duct 06 gradually change, further increasing the number of noise reflections and the noise attenuation effect. On the other hand, the inclined direction of the second flow divider 24 is more conducive to reflecting the noise of the second air passing opening 212 to the second air passing opening 212, and it is not easy to reflect out of the air outlet 214, so the noise attenuation effect is better. More preferably, the inclined direction of the second flow divider 24 is also beneficial to guiding the air flow at the air outlet 214 upward, thus avoiding the short circuit of the hot air flow at the air outlet 214 entering the air inlet 213.

[0064] In this embodiment, since the second section 222 is integrally connected to the bottom end of the inclined section 223, therefore, even if water, rain or snow enters the air outlet 214, the rain and snow in the air outlet cavity 27 will fall on the partition 22 under the action of gravity, part of them will slide down to the second section 222 through the inclined section 223, and part will directly fall on the second section 222. The projection of the second section 222 and the air inlet 213 on the projection plane perpendicular to the second direction at least partially overlap. A water passing opening 2221 is provided at the part of the second section 222 corresponding to the air inlet 213. Thus, the rain, snow, etc. on the second section 222 can be directly discharged through the air inlet 213, making the air inlet 213 integrate the functions of drainage and air intake, and the processing is simpler. In another embodiment, drainage openings 28 are respectively provided at the parts of the two sides of the air passing cavity 21 along the third direction corresponding to the partition 22, which is beneficial to discharging the rain and snow in the air outlet cavity 27. And since the air inlet 213 is close to the second side of the air passing cavity 21 along the first direction, the above setting makes the drainage openings 28 far from the air inlet 213, avoiding the discharged rain and snow being sucked into the air inlet 213.

[0065] The descriptions of the above specification and embodiments are used to explain the protection scope of the present invention, but do not constitute a limitation to the protection scope of the present invention. Modifications, equivalent replacements or other improvements to the embodiments of the present invention or some of its technical features that can be obtained by those of ordinary skill in the art through logical analysis, reasoning or limited experiments in combination with common general knowledge, ordinary technical knowledge in the field and / or the prior art under the inspiration of the present invention or the above embodiments shall all be included within the protection scope of the present invention.

Claims

1. A low-noise air heat exchanger (200), characterized in that: include A housing (10) is provided with a receiving chamber (11) and an air passage chamber (21); the receiving chamber (11) is adjacent to the air passage chamber (21) along a first direction and is connected via a first air passage (211) and a second air passage (212) arranged in a second direction perpendicular to the first direction; an air supply port (111) and an air return port (112) are provided on a side of the receiving chamber (11) away from the air passage chamber (21); an air inlet (213) and an air outlet (214) are arranged in the second direction on the side of the air passage chamber (21) away from the receiving chamber (11); the housing (10) is also provided with a partition plate (22), a first flow divider (211), and a second flow divider (212). 3) and a second flow divider (24); the partition (22) is placed in the air passage cavity (21) and divides the air passage cavity (21) into an air inlet cavity (26) and an air outlet cavity (27) along a second direction, the air inlet cavity (26) is connected to the first air passage (211) and the air inlet (213), and the air outlet cavity (27) is connected to the second air passage (212) and the air outlet (214); the first flow divider (23) is placed in the air inlet cavity (26) and is used to change the air passage area of ​​the air inlet cavity (26); the second flow divider (24) is placed in the air outlet cavity (27) and is used to change the air passage area of ​​the air outlet cavity (27); a heat exchange core (30) disposed in the accommodating cavity (11) and provided with an inner circulation air duct and an outer circulation air duct for heat exchange with each other, the inner circulation air duct being connected to the air supply port (111) and the air return port (112), and the outer circulation air duct being connected to the first air outlet (211) and the second air outlet (212); An internal circulation fan (40) is fixed relative to the housing (10) and is used to drive air from the return air port (112) through the internal circulation air duct to the supply air port (111); and An external circulation fan (50) is placed in the accommodating chamber (11) and is used to drive wind from the air inlet (213) through the external circulation air duct to flow to the air outlet (214).

2. A low-noise air heat exchanger (200) according to claim 1, characterized in that: The minimum wind passing area in the air inlet cavity (26) is larger than the wind passing area of ​​the first air outlet (211); and the minimum wind passing area in the air outlet cavity (27) is larger than the wind passing area of ​​the second air outlet (212).

3. A low-noise air heat exchanger (200) according to claim 2, characterized in that: The first flow divider (23) forms a first air inlet duct (01) connected to the air inlet (213), a second air inlet duct (02) connected to the first air inlet duct (211), and a third air inlet duct (03) connected to the first air inlet duct (01) and the second air inlet duct (02) between the first air outlet (211) and the air inlet (213); the air flow area of ​​the third air inlet duct (03) is inconsistent with the air flow area of ​​the first air inlet duct (01) and the air flow area of ​​the second air inlet duct (02); The second flow divider (24) forms a first air outlet (04) connected to the air outlet (214), a second air outlet (05) connected to the second air outlet (212), and a third air outlet (06) connected to the first air outlet (04) and the second air outlet (05) between the second air outlet (212) and the air outlet (214); the air flow area of ​​the third air outlet (06) is inconsistent with the air flow area of ​​the first air outlet (04) and the air flow area of ​​the second air outlet (05).

4. A low-noise air heat exchanger (200) as claimed in claim 3, characterized in that: The first air inlet duct (01) and the second air inlet duct (02) both form an angle with the extension direction of the third air inlet duct (03); the first air outlet duct (04) and the second air outlet duct (05) both form an angle with the extension direction of the third air outlet duct (06); and a sound absorbing layer (25) is fixedly connected to at least one air duct wall of each air inlet duct and each air outlet duct.

5. A low-noise air heat exchanger (200) according to claim 4, characterized in that: The two sides of the partition (22) facing away from each other respectively form the air duct walls of the third air inlet duct (03) and the third air outlet duct (06); the first diverter (23) is a plate-shaped structure opposite to the first air outlet (211), and the two sides thereof facing away from each other respectively form the air duct walls of the first air inlet duct (01) and the second air inlet duct (02); the second diverter (24) is a plate-shaped structure opposite to the second air outlet (212), and the two sides thereof facing away from each other respectively form the air duct walls of the first air outlet (04) and the second air outlet (05).

6. A low-noise air heat exchanger (200) as claimed in claim 5, characterized in that: The partition plate (22) is provided with an inclined section (223), and the inclined section (223) is inclined from an end close to the first side of the air passage cavity (21) along the first direction to a direction close to the second side of the air passage cavity (21) along the first direction to a direction away from the second air passage opening (212); The first flow divider (23) extends along the second direction and its extension line intersects with the inclined section (223); the air inlet (213) is away from the partition (22).

7. A low-noise air heat exchanger (200) according to claim 6, characterized in that: The second direction is a vertical direction; The air outlet (214) is located above the air inlet (213) and on the second side of the air passage cavity (21) along the first direction; the second flow divider (24) extends obliquely downward from the top of the air outlet (214) toward the direction close to the second air passage (212), and its extension line intersects with the inclined section (223).

8. A low-noise air heat exchanger (200) according to claim 7, characterized in that: The partition plate (22) is provided with a second section (222) extending along the first direction on the second side close to the air passage cavity (21) along the first direction, and the second section (222) is connected to the bottom end of the inclined section (223) as a whole; the second section (222) and the projection of the air inlet (213) on the projection plane perpendicular to the second direction at least partially overlap, and the second section (222) is provided with a water outlet (2221) at a portion corresponding to the air inlet (213).

9. A low-noise air heat exchanger (200) according to claim 7, characterized in that: Portions of the air passage cavity (21) corresponding to the partition plate (22) on both sides along a third direction are respectively provided with drainage openings (28), and the third direction is perpendicular to the first direction and the second direction.

10. An electrical cabinet, characterized in that: The invention comprises a cabinet (100) and a low-noise air heat exchanger (200) according to any one of claims 1 to 9, wherein the cabinet (100) is provided with a first side wall (101) perpendicular to a first direction and extending along a second direction, the housing (10) is embedded in the first side wall (101), the air supply port (111) and the air return port (112) are both located inside the cabinet (100), and the air inlet (213) and the air outlet (214) are both located outside the cabinet (100).

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