Noise reduction structure, low-noise air heat exchanger and electrical cabinet

Abstract

The utility model discloses a noise reduction structure, low noise air heat exchanger and electrical cabinet, noise reduction structure includes air through cavity, baffle plate, shunt piece, baffle plate is placed in the air through cavity and divides the air through cavity into air inlet cavity and air outlet cavity along the second direction, shunt piece is placed in air inlet cavity and / or air outlet cavity and is used for changing the air through area of air inlet cavity and / or air outlet cavity. The low-noise air heat exchanger comprises the noise reduction structure. The electrical cabinet comprises the low-noise air heat exchanger. When the device is applied, noise can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a noise reduction structure, a low-noise air heat exchanger, and an electrical cabinet. Background Technology

[0002] Electrical cabinets typically house a large number of electrical devices that cannot operate in high-temperature environments for extended periods. To minimize the impact of external dust on these devices, electrical cabinets often employ a closed structure. Air heat exchangers release heat from inside the cabinet to the external environment through heat exchange, making them a common method for cooling the interior of electrical cabinets. These air heat exchangers consist of internal and external circulation ducts for heat exchange, as well as internal and external circulation fans that drive the airflow in the internal and external circulation ducts, respectively. Both the internal and external circulation fans generate considerable noise during operation, and the noise from the electrical equipment inside the cabinet also propagates outwards through the air heat exchanger, resulting in a poor user experience. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background technology and provide a noise reduction structure, a low-noise air heat exchanger and an electrical cabinet, which have low noise when used.

[0004] To achieve the above objectives, 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 noise reduction structure, including an air passage cavity, which has a first air passage and a second air passage arranged along a first side of a first direction perpendicular to the first direction; a partition, which is placed in the air passage cavity and divides the air passage cavity into an air inlet cavity and an air outlet cavity along the second direction, the air inlet cavity being connected to the first air passage and having an air inlet, and the air outlet cavity being connected to the second air passage and having an air outlet; and a flow divider, which is placed in the air inlet cavity and / or the air outlet cavity to change the air passage area of ​​the air inlet cavity and / or the air outlet cavity.

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

[0007] Based on technical solution two, technical solution three is also provided. In technical solution three and its related embodiments, the diverting component includes a first diverting component placed in the air inlet cavity to change the air passage area of ​​the air inlet cavity and a second diverting component placed in the air outlet cavity to change the air passage area of ​​the air outlet cavity. The first diverting component forms a first air inlet channel communicating with the air inlet, a second air inlet channel communicating with the first air passage, and a third air inlet channel communicating with the first air inlet and the second air inlet, between the first air passage and the air inlet. The air passage area of ​​the third air inlet channel is different from that of the first air inlet channel and the second air inlet channel. The second diverting component forms a second air outlet channel communicating with the second air passage and a third air outlet channel communicating with the first air outlet and the second air outlet, between the second air passage and the air outlet. The air passage area of ​​the third air outlet channel is different from that of the first air outlet channel and the second air outlet channel.

[0008] Based on technical solution three, technical solution four is also provided. In technical solution four and its related embodiments, the first air inlet duct and the second air inlet duct are both at an angle to the extension direction of the third air inlet duct; the first air outlet duct and the second air outlet duct are both at an angle to the extension direction of the third air outlet duct; and at least one air duct wall of each air inlet duct and each air outlet duct is fixedly connected to a sound-absorbing layer.

[0009] Based on technical solution four, technical solution five is also provided. In technical solution five and its related embodiments, the two sides of the partition that are opposite to each other form the duct walls of the third air inlet duct and the third air outlet duct, respectively; the first diverting member is a plate-shaped structure opposite to the first air outlet, and its two sides that are opposite to each other form the duct walls of the first air inlet duct and the second air inlet duct, respectively; the second diverting member is a plate-shaped structure opposite to the second air outlet, and its two sides that are opposite to each other form the duct walls of the first air outlet duct and the second air outlet duct, respectively.

[0010] Based on technical solution five, there is also technical solution six. In technical solution six and its related embodiments, the partition is provided with an inclined section. The inclined section is inclined from one end near the air passage cavity along the first direction to the second side near the air passage cavity along the first direction and away from the second air passage opening.

[0011] Based on technical solution six, there is also technical solution seven. In technical solution seven and its related embodiments, the first diverter extends along the second direction and its extension line intersects with the inclined section; the air inlet is far away from the partition.

[0012] Based on technical solution seven, technical solution eight is also provided. In technical solution eight and its related embodiments, the second direction is a vertical direction; the air outlet is located above the air inlet and on the second side of the air passage cavity along the first direction; the second diverter extends downward from the top of the air outlet towards the direction close to the second air passage and its extension line intersects with the inclined section.

[0013] Technical Solution Nine and its related embodiments provide a low-noise air heat exchanger, including a shell with a receiving cavity and a noise reduction structure as described in any one of Technical Solutions One to Eight. The receiving cavity is adjacent to the air passage cavity along a first direction and communicates with it through a first air passage and a second air passage. The receiving cavity has an air supply port and a return air port on the side away from the air passage cavity. A heat exchange core is placed in the receiving cavity and has an internal circulation air duct and an external circulation air duct for heat exchange with each other. The internal circulation air duct communicates with the air supply port and the return air port, and the external circulation air duct communicates with the first air passage and the second air passage. An internal circulation fan is fixed relative to the shell and is used to drive air from the return air port to the air supply port. An external circulation fan is fixed relative to the shell and is used to drive air from the air inlet to the air outlet.

[0014] Technical solution ten and its related embodiments provide an electrical cabinet, including a cabinet body and a low-noise air heat exchanger as described in technical solution nine. The cabinet body is provided with a first side wall that is perpendicular to a first direction and extends along a second direction. The outer shell is embedded in the first side wall, and the air supply port and the air return port are both located inside the cabinet body, while the air inlet and the air outlet are both 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 solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0016] In technical solution one and its preferred embodiment, the air passage cavity is provided with a first air passage opening and a second air passage opening along a first side in a first direction and along a second direction. The structure of the air passage cavity allows it to be connected to a noisy electrical device in practical applications, and the first and second air passage openings are connected to the inner cavity of the electrical device. A partition is placed inside the air passage cavity and divides it into an air inlet cavity and an air outlet cavity along the second direction. A diverter is placed in the air inlet cavity and / or the air outlet cavity to change the air passage area of ​​the air inlet cavity and / or the air outlet cavity. On the one hand, compared with setting two spaced air inlets, The air inlet and outlet cavities are more conducive to reducing material costs and installation procedures. On the other hand, 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 sound waves and generate reflection. The change in the air passage area of ​​the air inlet and / or air outlet cavities can reduce noise by increasing the number of noise reflections. Furthermore, when the diverter is placed in the air inlet cavity, it also prolongs the propagation path of the sound waves in the air inlet cavity. When the diverter is placed in the air outlet cavity, it also prolongs the propagation path of the sound waves in the air outlet cavity, which can also increase the noise reduction effect. Furthermore, the aforementioned arrangement ensures that the air inlet and the first air outlet are far apart. When the diverter is placed inside the air inlet cavity, its design further extends the airflow path between the air inlet and the first air outlet, creating a barrier. Similarly, the air outlet and the second air outlet are far apart. When the diverter is placed inside the air outlet cavity, its design further extends the airflow path between the second air outlet and the air outlet, creating a barrier. Therefore, even without waterproof louvers at the air inlet and air outlet, wind, sand, rain, and snow are unlikely to enter through the air inlet. The system includes a first air inlet and an outlet leading to a second air inlet. Furthermore, when waterproof louvers are not required at the inlet and outlet, the noise issue caused by waterproof louvers is mitigated. The baffle balances the airflow between the inlet and outlet chambers. When the diverter is placed in the inlet chamber, it balances the resistance in different areas of the inlet chamber; similarly, when placed in the outlet chamber, it balances the resistance in different areas of the outlet chamber, preventing excessive local resistance and resulting in low overall air resistance. When applied to low-noise air heat exchangers, this ensures the heat exchange efficiency of the air heat exchanger. Therefore, the noise reduction structure of this technical solution can significantly reduce noise and provide a superior user experience when applied to low-noise air heat exchangers and their electrical cabinets.

[0017] In the second technical solution and its preferred embodiment, the minimum air passage area in the air inlet cavity is greater than the air passage area of ​​the first air passage, and the minimum air passage area in the air outlet cavity is greater than the air passage area of ​​the second air passage. This allows noise to be reflected when it enters the air inlet cavity from the first air passage due to the change in air passage area, and noise to be reflected when it enters the air outlet cavity from the second air passage due to the change in air passage area. This further increases the noise reflection and improves the noise reduction effect. In addition, it also helps to reduce the wind resistance when the airflow enters the air outlet from the second air passage.

[0018] In technical solution three and its related embodiments, the diverter includes a first diverter placed in the air inlet cavity to change the air passage area of ​​the air inlet cavity and a second diverter placed in the air outlet cavity to change the air passage area of ​​the air outlet cavity, achieving the technical effect of simultaneously setting diverters in the air inlet cavity and the air outlet cavity. The air passage area of ​​the third air inlet duct is different from that of the first air inlet duct and the second air inlet duct, and the air passage area of ​​the third air outlet duct is different from that of the first air outlet duct and the second air outlet duct. This allows noise reduction to be achieved by increasing the number of noise reflections. Combined with the fact that the minimum air passage area in the air inlet cavity is larger than that of the first air outlet and the minimum air passage area in the air outlet cavity is larger than that of the second air outlet, the above arrangement ensures that the noise undergoes at least three sudden changes in the duct area during the process of noise being transmitted from the first air outlet to the air inlet and from the second air outlet to the air outlet. This increases the number of reflections due to the impedance mismatch of the noise sound waves, further increasing the noise reduction effect. In addition, the multiple air inlets further extend the airflow path between the first air inlet and the air outlet, and the multiple air outlets extend the airflow path between the second air inlet and the air outlet. This not only helps to prevent wind, sand, rain and snow from entering the first and second air inlets, but also helps to balance the resistance in different areas of the air inlet and air outlet chambers, resulting in low overall air resistance and further ensuring the heat dissipation efficiency of the low-noise air heat exchanger when applied to it.

[0019] In technical solution four and its preferred embodiments, the first and second air inlets are both at an angle to the extension direction of the third air inlet. That is, there are two sets of adjacent air inlets at an angle. The noise transmitted from the first air inlet can be reflected and refracted multiple times after entering the air inlet cavity before being transmitted through the air inlet. This causes the noise to form at least two large turns in the air inlet cavity after entering the air inlet cavity from the first air inlet, further increasing the number of reflections and refractions of the noise in the air inlet cavity. This further increases the energy loss of the sound wave and reduces the noise transmitted from the air inlet. In addition, this setting can further block rain, snow, sand and other wind from entering the first air inlet through the air inlet, thus improving the protection. The first and second air outlets both form an angle with the extension direction of the third air outlet. This means there are two sets of adjacent air outlets extending at an angle. Noise transmitted through the second air inlet undergoes multiple reflections and refractions after entering the air outlet cavity before exiting through the outlet. This causes the noise to undergo at least two large turns within the air outlet cavity after entering through the second air inlet, further increasing the number of reflections and refractions within the air outlet cavity. This further increases the energy loss of the sound waves and reduces the noise transmitted from the outlet. Furthermore, this design further prevents rain, snow, and sand from entering the second air inlet through the outlet, improving protection. At least one sound-absorbing layer is fixed to the wall of each air inlet and outlet duct. The sound-absorbing layer absorbs noise, further reducing noise levels.

[0020] In technical solution five and its preferred embodiments, the sides of the partition that are opposite to each other form the duct walls of the third air inlet duct and the third air outlet duct, respectively. The first diverter is a plate-shaped structure opposite to the first air outlet, and its sides that are opposite to each other form the duct walls of the first air inlet duct and the second air inlet duct, respectively. The second diverter is a plate-shaped structure opposite to the second air outlet, and its sides that are opposite to each other form the duct walls of the first air outlet duct and the second air outlet duct, respectively. On the one hand, this arrangement allows the structures of the first and second diverters to be plate-shaped, and three air inlets can be formed by adjusting the position and extension direction of the first and second diverters. The structure is simpler, with three air inlets and three air outlets, and two sets of adjacent air inlets extending at an angle to each other. This allows for the formation of three air inlets within the air inlet chamber and three air outlets within the air outlet chamber with minimal modifications. Furthermore, the space within the air inlet chamber is primarily used to form air inlets, and the space within the air outlet chamber is primarily used to form air outlets. Each air inlet and air outlet can have a large air passage area, resulting in low wind resistance during air passage. This avoids the problems of excessive wind resistance caused by increasing the length of the air ducts, which is detrimental to air intake and exhaust.

[0021] Furthermore, the above-mentioned configuration also provides better noise attenuation and protection. Firstly, since the first diverter is opposite to the first air inlet and the second diverter is opposite to the second air inlet, noise entering the second air inlet from the first air inlet is reflected and refracted by the first diverter, and noise entering the second air outlet from the second air inlet is reflected and refracted by the second diverter. This results in the noise undergoing at least three major turns from the first air inlet to the air inlet, and at least three major turns from the second air inlet to the air outlet. The increased number of reflections and refractions enhances the noise attenuation effect. The effect is better. Similarly, when rain, snow, wind, and sand enter, they are slowed down by multiple impacts, resulting in better protection. On the other hand, the connection between the first, third, and second air inlets forms a U-shaped air duct structure, and the connection between the first, third, and second air outlets also forms a U-shaped air duct structure. The turning angle of noise propagation is larger, so that the noise entering the air inlet from the first air inlet can be better reflected and refracted, and the noise entering the air outlet from the second air inlet can also be better reflected and refracted, resulting in better noise attenuation and better protection against rain, snow, wind, and sand.

[0022] In technical solution six and its preferred embodiment, the partition is provided with an inclined section. The inclined section is inclined from one end near the air passage cavity along the first side of the first direction to the second side near the air passage cavity along the first direction, and away from the second air passage. On the one hand, the partition can make the air passage area of ​​the third air inlet and the third air outlet continuously change in the corresponding inclined section, thereby further increasing the number of reflections due to the impedance mismatch of the sound waves of noise, and further increasing the noise attenuation effect. On the other hand, the setting of the inclined section is also conducive to guiding the airflow entering from the air inlet to the second air inlet and then into the first air passage, and guiding the airflow from the second air passage to the first air outlet and then into the air outlet, with less wind resistance.

[0023] In technical solution seven and its preferred embodiments, the first diverter extends along the second direction and its extension line intersects with the inclined section. The air inlet is far away from the partition. On the one hand, this is beneficial to control the length of the first diverter along the second direction so that the air passage area of ​​the third air inlet is not the same as the air passage area of ​​the first air inlet and the air passage area of ​​the second air inlet. On the other hand, the extension of the first diverter along the second direction makes the first air inlet, the second air inlet and the third air inlet basically perpendicular to each other. This is more conducive to the reflection and refraction of air during the transmission from the first air passage to the air inlet, thereby increasing the noise attenuation and reducing noise. It is also more conducive to preventing rain, snow and sand from entering the first air passage through the air inlet, thus improving the protection.

[0024] In technical solution eight and its preferred embodiments, the second diverter extends downwards from the top of the air outlet towards the direction close to the second air passage, and its extension line intersects with the inclined section. On the one hand, this is beneficial to ensure that the air passage area of ​​the third air outlet is different from that of the first and second air outlets, and also makes the air passage areas of the first and third air outlets gradually change, further increasing the number of noise reflections and increasing the noise attenuation effect. On the other hand, the inclined direction of the second diverter is more conducive to the noise from the second air passage being reflected to the second air passage, rather than being reflected out of the air outlet, resulting in better noise attenuation. More advantageously, the inclined direction of the second diverter also helps to guide the airflow of the air outlet upwards, thereby avoiding the hot air from the air outlet entering the air inlet and causing a short circuit of the hot airflow.

[0025] Technical solution nine and its preferred embodiments have the technical advantages of any one of technical solutions one to eight, wherein the internal circulation fan being fixed relative to the outer casing means that the position of the internal circulation fan and the outer casing is relatively fixed. The internal circulation fan can be fixed to the outer casing or it cannot be not fixed to the outer casing.

[0026] Technical solution ten and its preferred embodiments have the technical advantages of technical solution nine. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the electrical cabinet according to an embodiment of this application;

[0029] Figure 2 This is a top view of the low-noise air heat exchanger according to an embodiment of this application;

[0030] Figure 3 for Figure 2 Sectional view along the AA direction.

[0031] Explanation of key figure labels:

[0032] Cabinet 100; First side wall 101; Low-noise air heat exchanger 200; Outer shell 10; Receiving cavity 11; Air supply port 111; Air return port 112; First partition 113; Second partition 114; Noise reduction structure 20; Air passage cavity 21; First air passage port 211; Second air passage port 212; Air inlet 213; Air outlet 214; Partition 22; First section 221; Second section 222; Inclined section 223; First diverter 23; Second diverter 24; Sound absorption layer 25; Air inlet cavity 26; Air outlet cavity 27; 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; Internal circulation fan 40; External circulation fan 50. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0035] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0036] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0037] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0038] See Figure 1 , Figure 1 An electrical cabinet is shown, including a cabinet body 100 and a low-noise air heat exchanger 200. In practical applications, the electrical cabinet also includes electrical equipment housed within the cabinet body 100. The cabinet body 100 forms a sealed structure to improve the protection of the electrical equipment. The low-noise air heat exchanger 200 is mounted on the cabinet body 100 and is used to dissipate heat from the electrical equipment. The cabinet body 100 is generally rectangular in shape, and has a first sidewall 101 that is perpendicular to a first direction and extends along a second direction perpendicular to the first direction.

[0039] See Figure 2-3 , Figure 2 A top view of a low-noise air heat exchanger 200 is shown. Figure 3 A cross-sectional view of a low-noise air heat exchanger 200 is shown. 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 middle, the outer shell 10 is embedded in the first side wall 101 and the low-noise air heat exchanger 200 is installed in the cabinet 100.

[0040] See Figure 3 The outer shell 10 is provided with a receiving cavity 11 and a noise reduction structure 20. The main improvement of this embodiment is the noise reduction structure 20, which will be introduced below.

[0041] See Figure 3 The noise reduction structure 20 includes an air passage 21, a partition 22, a first diverter 23, a second diverter 24, and a sound-absorbing layer 25.

[0042] See Figure 2-3 The air passage cavity 21 is generally rectangular, with its width in the first direction, its height in the second direction, and its length in the third direction. A first air passage 211 and a second air passage 212 are arranged along a first side of the first direction and perpendicular to the first direction in the second direction. A partition 22 is placed inside the air passage cavity 21, dividing it into an air inlet cavity 26 and an air outlet cavity 27 along the second direction. The air inlet cavity 26 connects to the first air passage 211 and has an air inlet 213, while the air outlet cavity 27 connects to the second air passage 212 and has an air outlet 214. In this embodiment, the second direction is vertical. The first air passage 211 and the second air passage 212 are located at the lower and upper ends of the first side of the air passage cavity 21, respectively. 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. Figure 3In this configuration, the air outlet 214 is located at the upper end of the air passage cavity 21, while the air inlet 213 is located at the bottom end of the air passage cavity 21 and is formed on the bottom surface of the air passage cavity 21 and the side surface of the second side of the air passage cavity 21, thereby keeping the air inlet 213 away from the partition 22. Exemplarily, the partition 22 is Z-shaped, having a first segment 221 and a second segment 222 extending along a first direction, and an inclined segment 223 connecting the first segment 221 and the second segment 222. The inclined segment 223 slopes from one end near the first side of the air passage cavity 21 along the first direction toward the second side of the air passage cavity 21 along the first direction, moving away from the second air outlet 212. Figure 3 In this embodiment, the second segment 222 is located to the right and below the first segment 221, and the inclined segment 223 slopes downward from left to right. It should be understood that in other embodiments, the partition 22 may also be of other shapes, such as a zigzag shape, an arc shape, or a structure formed by other curved segments. In this embodiment, the two sides of the partition 22 that are opposite to each other form the duct walls of the third air inlet duct 03 and the third air outlet duct 06 as described below.

[0043] The first diverter 23 is placed inside the air inlet cavity 26 and is used to change the air passage area of ​​the air inlet cavity 26. The first diverter 23 forms at least two air inlets with their extension directions forming an angle between the air inlet 213 and the first air passage 211. In this embodiment, each air inlet is a first air inlet 01 connected to the air inlet 213, a second air inlet 02 connected to the first air passage 211, and a third air inlet 03 connected to the first air inlet 01 and the second air inlet 02. The first air inlet 01 and the second air inlet 02 are both at an angle to the extension direction of the third air inlet 03. In this embodiment, the first air inlet 01 and the second air inlet 02 are both directly connected to the third air inlet 03. However, it should be understood that the first air inlet 01 and the third air inlet 03, as well as the second air inlet 02 and the third air inlet 03, can also be indirectly connected, such as through a transitional air duct. In this embodiment, the first diverter 23 is a plate-shaped structure opposite to the first air outlet 211, and the projection of the first diverter 23 on the projection plane perpendicular to the first direction covers the first air outlet 211. The two sides of the first diverter 23 that are opposite to each other form the air duct walls of the first air inlet 01 and the second air inlet 02, respectively. The first diverter 23 extends along the second direction and its extension line intersects with the inclined section 223. The air passage area of ​​the third air inlet 03 is different from the air passage area of ​​the first air inlet 01 and the air passage area of ​​the second air inlet 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 outlet 211, that is, the air passage area of ​​each air inlet is greater than the air passage area of ​​the first air outlet 211. The airflow area of ​​each air inlet can be adjusted by the length and position of the first diverter 23, or by adjusting the size of the airflow cavity 21, such as making the length of the airflow cavity 21 along a third direction greater than the length of the accommodating cavity 11 along a third direction. It should be understood that although only an embodiment in which the first diverter 23 has a plate-like structure is shown in this embodiment, those skilled in the art will understand that the first diverter 23 can be formed by connecting multiple bent sections.

[0044] The second diverter 24 is placed inside the air outlet cavity 27 and is used to change the air passage area of ​​the air outlet cavity 27. The second diverter 24 forms at least two air outlet ducts with their extending directions forming an angle between the second air passage 212 and the air outlet 214. Each air outlet duct is a first air outlet duct 04 connected to the air outlet 214, a second air outlet duct 05 connected to the second air passage 212, and a third air outlet duct 06 connecting the first air outlet duct 04 and the second air outlet duct 05; the first air outlet duct 04 and the second air outlet duct 05 both form an angle with the extending direction of the third air outlet duct 06. In this embodiment, the first air outlet duct 04 and the second air outlet duct 05 are both directly connected to the third air outlet duct 06. However, it should be understood that the first air outlet duct 04 and the third air outlet duct 06, as well as the second air outlet duct 05 and the third air outlet duct 06, can also be indirectly connected, such as through a transitional air duct. In this embodiment, the second diverter 24 is a plate-shaped structure opposite to the second air outlet 212. The projection of the second diverter 24 onto a projection plane perpendicular to the first direction covers the second air outlet 212. The two opposite sides of the second diverter 24 form the duct walls of the first air outlet 04 and the second air outlet 05, respectively. The second diverter 24 extends obliquely downward from the top of the air outlet 214 towards the second air outlet 212, and its extension line intersects with the oblique segment 223. The air passage area of ​​the third air outlet 06 is different from that of the first air outlet 04 and the second air outlet 05. In this embodiment, the minimum air passage area in the air outlet cavity 27 is greater than the air passage area of ​​the second air outlet 212, that is, the air passage area of ​​each air outlet is greater than that of the second air outlet 212. The air passage area of ​​each air outlet can be adjusted by adjusting the length and position of the second diverter 24, or by adjusting the size of the air outlet cavity 21. It should be understood that, although only a plate-like structure of the second diverter 24 is shown in this embodiment, those skilled in the art will understand that the second diverter 24 can be formed by connecting multiple bent segments. It should also be understood that, although this embodiment shows the case where the first diverter 23 is disposed in the air inlet cavity 26 and the second diverter 24 is disposed in the air outlet cavity 27, as needed, diverters can be disposed only in the air inlet cavity 26 or only in the air outlet cavity 27. That is, the noise reduction structure 20 includes diverters, which are placed in the air inlet cavity 26 and / or the air outlet cavity 27 to change the airflow area of ​​the air inlet cavity 26 and / or the air outlet cavity 27. In this embodiment, the diverters include a first diverter 23 disposed in the air inlet cavity 26 for changing the airflow area of ​​the air inlet cavity 26 and a second diverter 24 disposed in the air outlet cavity 27 for changing the airflow area of ​​the air inlet cavity 26.

[0045] In this embodiment, at least one air duct wall of each air inlet and each air outlet is fixedly connected to a sound-absorbing layer 25. Figure 3In the middle, sound-absorbing cotton is fixedly attached to the two sides of the partition 22 that are opposite to each other, the two sides of the first diverter 23 that are opposite to each other, the side of the second diverter 24 facing the second air outlet 212, the top wall and bottom wall of the air passage 21, and the side wall of the second side of the air passage 21 to form a sound-absorbing layer 25. The sound-absorbing layer 25 fixedly attached at the above positions can achieve good noise reduction effect at a lower cost. However, it should be understood that the sound-absorbing layer 25 can be fixedly attached to the air duct wall of each air inlet and each air outlet to achieve better noise reduction effect.

[0046] See also Figure 3 The accommodating cavity 11 is adjacent to the air passage cavity 21 along the first direction and is connected through the first air passage 211 and the second air passage 212. The accommodating cavity 11 is also rectangular in shape and shares a side wall with the air passage cavity 21. The side of the accommodating cavity 11 away from the air passage cavity 21 is provided with an air supply port 111 and a return air port 112. The low-noise air heat exchanger 200 is installed after the cabinet 100. The air supply port 111 and the return air 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.

[0047] The heat exchange core 30 is a prior art material. It is placed in the accommodating cavity 11 and is provided with an internal circulation air duct and an external circulation air duct for heat exchange with each other. For example, there are multiple internal circulation air ducts and external circulation air ducts. Each internal circulation air duct and each external circulation air duct is arranged alternately along a third direction. The internal circulation air duct is connected to the air supply port 111 and the air return port 112. The external circulation air duct is connected to the first air passage port 211 and the second air passage port 212. The two ends of the heat exchange core 30 along the second direction form a first interval 113 connected to the first air passage port 211 and a second interval 114 connected to the second air passage port 212, respectively.

[0048] The internal circulation fan 40 is fixed relative to the outer casing 10 and is used to drive air from the return air inlet 112 to the air supply outlet 111. The internal circulation fan 40 being fixed relative to the outer casing 10 means that the position of the internal circulation fan 40 and the outer casing 10 is relatively fixed. The internal circulation fan 40 can be fixed to the outer casing 10 or not fixed to the outer casing 10. For example, in this embodiment, the internal circulation fan 40 is fixed to the outer casing 10 and installed at the air supply outlet 111. The internal circulation fan 40 can drive air from the return air inlet 112 through the internal circulation air duct to the air supply outlet 111, thereby dissipating heat inside the cabinet 100.

[0049] The external circulation fan 50 is fixed relative to the outer casing 10 and is used to drive air from the air inlet 213 to the air outlet 214. In this embodiment, the external circulation fan 50 is installed in the second partition 114. The external circulation fan 50 drives air 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 outlet 211 into the first partition 113. Then, it passes through the external circulation duct, the second partition 114, the second air outlet 212, the second air outlet 05, the third air outlet 06, and the first air outlet 04 before being discharged from the air outlet 214. The noise from the internal circulation fan 40, the external circulation fan 50, and the electrical equipment inside the cabinet 100 is transmitted to the air inlet 213 through the first air outlet 211 and to the air outlet 214 through the second air outlet 212.

[0050] In this embodiment, the air passage cavity 21 is provided with a first air passage 211 and a second air passage 212 along the first side of the first direction and along the second direction. The structure of the air passage cavity 21 allows it to be connected to an electrical device that generates noise in practical applications, and the first air passage 211 and the second air passage 212 are connected to the inner cavity of the electrical device. A partition 22 is placed inside 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 diverter 23 is placed inside the air inlet cavity 26 and is used to change the air passage area of ​​the air inlet cavity 26; a second diverter 24 is placed inside the air outlet cavity 27 and is used to change the air passage area of ​​the air outlet cavity 27. On the one hand, compared with setting two partitions, The separate arrangement of the air inlet cavity 26 and the air outlet cavity 27 is more conducive to reducing material costs and installation procedures. On the other hand, due to the change in the air passage area of ​​the air cavity during the propagation of sound waves, the impedance mismatch of the sound waves will cause reflection. The first diverter 23 is used to change the air passage area of ​​the air inlet cavity 26, and the second diverter 24 is used to change the air passage area of ​​the air outlet cavity 27. This allows the noise to be attenuated by increasing the number of noise reflections, thereby achieving the noise reduction effect. In addition, the setting of the first diverter 23 also extends the propagation path of the sound waves in the air inlet cavity 26, and the setting of the second diverter 24 also extends the propagation path of the sound waves in the air outlet cavity 27, which can also increase the noise reduction effect. Furthermore, the above-mentioned arrangement ensures that the air inlet 213 and the first air outlet 211 are far apart from each other. The first diverter 23 further extends the airflow path between the air inlet 213 and the first air outlet 211, forming a barrier. Similarly, the air outlet 214 is far apart from the second air outlet 212. The second diverter 24 further extends the airflow path between the second air outlet 212 and the air outlet 214, forming a barrier. Therefore, even without waterproof louvers at the air inlet 213 and the air outlet 214, wind, sand, rain, and snow are unlikely to enter the first air outlet 211 through the air inlet 213 or the air outlet 214. The second air inlet 212 ensures the protection of the low-noise air heat exchanger 200 when the noise reduction structure 20 is applied to the low-noise air heat exchanger 200. When waterproof louvers are not required at the air inlet 213 and air outlet 214, the noise problem caused by the waterproof louvers is also improved. The baffle can balance the air volume of the air inlet cavity 26 and the air outlet cavity 27. The first diverter 23 can balance the resistance of different areas in the air inlet cavity 26, and the second diverter 24 can balance the resistance of different areas in the air outlet cavity 27, avoiding excessive local resistance and low overall air resistance. When applied to the low-noise air heat exchanger 200, this ensures the heat dissipation efficiency of the low-noise air heat exchanger 200.

[0051] Therefore, when the noise reduction structure 20 of this technical solution is applied to the low-noise air heat exchanger 200 and the electrical cabinet including the low-noise air heat exchanger 200, it can greatly reduce noise and provide a better user experience.

[0052] 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 211, and the minimum air passage area in the air cavity is greater than the air passage area of ​​the second air passage 212. This allows noise to be reflected when it enters the air inlet cavity 26 from the first air passage 211 due to the change in air passage area, and noise to be reflected when it enters the air outlet cavity 27 from the second air passage 212 due to the change in air passage area. This further increases the noise reflection and improves the noise reduction effect. In addition, it also helps to reduce the wind resistance when the airflow enters the air outlet 214 from the second air passage 212.

[0053] In this embodiment, the air passage area of ​​the third air inlet duct 03 is different from that of the first air inlet duct 01 and the second air inlet duct 02. The air passage area of ​​the third air outlet duct 06 is different from that of the first air outlet duct 04 and the second air outlet duct 05. This allows for noise reduction by increasing the number of noise reflections. Combined with the fact that the minimum air passage area in the air inlet cavity 26 is greater than that in the first air outlet 211, and the minimum air passage area in the air outlet cavity 27 is greater than that in the second air outlet 212, the above arrangement ensures that the noise undergoes at least three abrupt changes in air passage area during the process of noise being transmitted from the first air outlet 211 to the air inlet 213 and from the second air outlet 212 to the air outlet 214. This increases the number of reflections due to impedance mismatch of the noise sound waves, further enhancing the noise reduction effect. In addition, the arrangement of multiple air inlets further extends the airflow path between the first air inlet 211 and the air inlet 213, and the arrangement of multiple air outlets extends the airflow path between the second air inlet 212 and the air outlet 214. This not only helps to prevent wind, sand, rain and snow from entering the first air inlet 211 and the second air inlet 212, but also helps to balance the resistance of different areas in the air inlet cavity 26 and the air outlet cavity 27. The overall wind resistance is small, which further ensures the heat dissipation efficiency of the low-noise air heat exchanger 200.

[0054] In this embodiment, the first air inlet duct 01 and the second air inlet duct 02 are both at an angle to the extension direction of the third air inlet duct 03. That is, the extension directions of two sets of adjacent air inlets are at an angle. The noise transmitted from the first air inlet 211 can be reflected and refracted multiple times after entering the air inlet cavity 26 before being transmitted through the air inlet 213. This causes the noise to form at least two large turns within the air inlet cavity 26 after entering from the first air inlet 211, further increasing the number of reflections and refractions of the noise within the air inlet cavity 26. This further increases the energy loss of the sound wave and reduces the noise transmitted from the air inlet 213. In addition, this arrangement can further block rain, snow, sand and other wind from entering the first air inlet 211 through the air inlet 213, thus improving the protection. 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. That is, the extension directions of two adjacent air outlet ducts form an angle. Noise transmitted through the second air inlet 212 undergoes multiple reflections and refractions after entering the air outlet cavity 27 before being transmitted through the air outlet 214. This causes the noise to undergo at least two large turns within the air outlet cavity 27 after entering from the second air inlet 212, further increasing the number of reflections and refractions within the air outlet cavity 27. This further increases the energy loss of the sound waves and reduces the noise transmitted from the air outlet 214. Furthermore, this arrangement further prevents rain, snow, and sand from entering the second air inlet 212 through the air outlet 214, improving protection. At least one sound-absorbing layer 25 is fixed to the wall of each air inlet and each air outlet duct. The sound-absorbing layer 25 absorbs noise, further reducing noise levels.

[0055] In this embodiment, the sides of the partition 22 that are opposite to each other form the duct walls of the third air inlet duct 03 and the third air outlet duct 06, respectively. The first diverter 23 is a plate-shaped structure opposite to the first air outlet 211, and its sides that are opposite to each other form the duct walls of the first air inlet duct 01 and the second air inlet duct 02, respectively. The second diverter 24 is a plate-shaped structure opposite to the second air outlet 212, and its sides that are opposite to each other form the duct walls of the first air outlet duct 04 and the second air outlet duct 05, respectively. On the one hand, this arrangement allows the structures of the first diverter 23 and the second diverter 24 to be plate-shaped. By adjusting the position and extension direction of the first diverter 23 and the second diverter 24, This design allows for the formation of three air inlets and three air outlets, with two sets of adjacent air inlets extending at an angle to each other, and two sets of adjacent air outlets extending at an angle to each other. The structure is simpler, allowing for the formation of three air inlets within the air inlet cavity 26 and three air outlets within the air outlet cavity 27 with minimal modifications. Furthermore, the space within the air inlet cavity 26 is primarily used to form air inlets, and the space within the air outlet cavity 27 is primarily used to form air outlets. Each air inlet and each air outlet can have a large air passage area, resulting in low wind resistance during air passage and avoiding excessive wind resistance caused by increasing the length of the air ducts, which is detrimental to air intake and exhaust.

[0056] Furthermore, the above-mentioned configuration also provides better noise attenuation and protection. Firstly, since the first diverter 23 is opposite to the first air inlet 211, and the second diverter 24 is opposite to the second air inlet 212, noise entering the second air inlet 02 from the first air inlet 211 is reflected and refracted by the first diverter 23, and noise entering the second air outlet 05 from the second air inlet 212 is reflected and refracted by the second diverter 24. Thus, the noise undergoes at least three major turns from the first air inlet 211 to the air inlet 213, and at least three major turns from the second air inlet 212 to the air outlet 214, further reducing the number of reflections and refractions. The more air intakes, the better the noise attenuation effect. Similarly, when rain, snow, wind, and sand enter, they are decelerated by multiple impacts, resulting in better protection. On the other hand, the connection between the first air intake duct 01, the third air intake duct 03, and the second air intake duct 02 forms a U-shaped air duct structure, and the connection between the first air outlet duct 04, the third air outlet duct 06, and the second air outlet duct 05 also forms a U-shaped air duct structure. The turning angle of noise propagation is larger, so that the noise can be better reflected and refracted after entering the air intake 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. The noise attenuation effect is better, and the protection effect against rain, snow, wind, and sand is also better.

[0057] In this embodiment, the partition 22 is provided with an inclined section 223. The inclined section 223 is inclined from one end near the air passage cavity 21 along the first side of the first direction to the second side near the air passage cavity 21 along the first direction away from the second air passage 212. On the one hand, the partition 22 can make the air passage area 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 noise, and further increasing the noise attenuation effect. On the other hand, the setting of the inclined section 223 is also conducive to guiding the airflow entering from the air inlet 213 to the second air inlet duct 02 and then into the first air passage 211, and guiding the airflow from the second air passage 212 to the first air outlet duct 04 and then into the air outlet 214, with less wind resistance.

[0058] In this embodiment, the first diverter 23 extends along the second direction and its extension line intersects with the inclined section 223. The air inlet 213 is far away from the partition 22. On the one hand, it is beneficial to control the length of the first diverter 23 along the second direction so that the air passage area of ​​the third air inlet 03 is different from the air passage area of ​​the first air inlet 01 and the air passage area of ​​the second air inlet 02. On the other hand, the extension of the first diverter 23 along the second direction makes the first air inlet 01 and the second air inlet 02 basically perpendicular to the third air inlet 03. This is more conducive to the reflection and refraction of the air during the transmission from the first air passage 211 to the air inlet 213, thereby increasing the noise attenuation and reducing the noise. It is also more conducive to preventing rain, snow and sand from entering the first air passage 211 through the air inlet, thus improving the protection.

[0059] In this embodiment, the second diverter 24 extends downward from the top of the air outlet 214 towards the second air passage 212, and its extension line intersects with the inclined section 223. On the one hand, this facilitates the realization that the air passage area of ​​the third air outlet 06 is different from that of the first air outlet 04 and the second air outlet 05, and also makes the air passage areas of the first air outlet 04 and the third air outlet 06 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 diverter 24 is more conducive to the noise from the second air passage 212 being reflected back to the second air passage 212, rather than being reflected out of the air outlet 214, resulting in better noise attenuation. More importantly, the inclined direction of the second diverter 24 also helps to guide the airflow of the air outlet 214 upward, thereby avoiding the hot air from the air outlet 214 entering the air inlet 213 and causing a short circuit in the hot airflow.

[0060] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A noise reduction structure (20), characterized in that, include The air passage (21) has a first air passage (211) and a second air passage (212) arranged on a first side along a first direction perpendicular to the first direction; A partition (22) is placed inside the air passage cavity (21) and divides the air passage cavity (21) along the second direction into an air inlet cavity (26) and an air outlet cavity (27). The air inlet cavity (26) is connected to the first air passage (211) and has an air inlet (213). The air outlet cavity (27) is connected to the second air passage (212) and has an air outlet (214). A flow divider is placed in the air inlet cavity (26) and / or air outlet cavity (27) to change the air passage area of ​​the air inlet cavity (26) and / or air outlet cavity (27).

2. The noise reduction structure (20) as described in claim 1, characterized in that, The minimum air passage area in the air inlet cavity (26) is greater than the air passage area of ​​the first air passage (211); the minimum air passage area in the air outlet cavity (27) is greater than the air passage area of ​​the second air passage (212).

3. The noise reduction structure (20) as described in claim 2, characterized in that, The diverting component includes a first diverting component (23) placed in the air inlet cavity (26) for changing the air passage area of ​​the air inlet cavity (26) and a second diverting component (24) placed in the air outlet cavity (27) for changing the air passage area of ​​the air inlet cavity (26); the first diverting component (23) forms a first air inlet duct (01) communicating with the air inlet (213), a second air inlet duct (02) communicating with the first air passage (211), and a third air inlet duct (03) communicating with 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 third air inlet duct (03) 3) The air passage area is different from the air passage area of ​​the first air inlet (01) and the air passage area of ​​the second air inlet (02); the second diverter (24) forms a first air outlet (04) connected to the air outlet (214), a second air outlet (05) connected to the second air inlet (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 passage area of ​​the third air outlet (06) is different from the air passage area of ​​the first air outlet (04) and the air passage area of ​​the second air outlet (05).

4. The noise reduction structure (20) as described in claim 3, characterized in that, The first air inlet duct (01) and the second air inlet duct (02) are both at an angle to the extension direction of the third air inlet duct (03); the first air outlet duct (04) and the second air outlet duct (05) are both at an angle to the extension direction of the third air outlet duct (06); at least one air duct wall of each air inlet duct and each air outlet duct is fixedly connected to a sound-absorbing layer (25).

5. The noise reduction structure (20) as described in claim 4, characterized in that, The partition (22) forms the air duct walls of the third air inlet (03) and the third air outlet (06) on its opposite sides; the first diverter (23) is a plate-shaped structure opposite to the first air outlet (211), and its opposite sides form the air duct walls of the first air inlet (01) and the second air inlet (02) respectively; the second diverter (24) is a plate-shaped structure opposite to the second air outlet (212), and its opposite sides form the air duct walls of the first air outlet (04) and the second air outlet (05) respectively.

6. The noise reduction structure (20) as described in claim 5, characterized in that, The partition (22) is provided with an inclined section (223), which is inclined from one end near the air passage cavity (21) along the first direction to the second side near the air passage cavity (21) along the first direction and away from the second air passage opening (212).

7. The noise reduction structure (20) as described in claim 6, characterized in that, The first diverter (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).

8. The noise reduction structure (20) as described in claim 7, 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 diverter (24) extends downward from the top of the air outlet (214) towards the direction close to the second air passage (212) and its extension line intersects with the inclined section (223).

9. A low-noise air heat exchanger (200), characterized in that, include The outer casing (10) is provided with a receiving cavity (11) and a noise reduction structure (20) as described in any one of claims 1-8. The receiving cavity (11) is adjacent to the air passage cavity (21) along a first direction and communicates with it through a first air passage (211) and a second air passage (212). An air supply port (111) and a return air port (112) are provided on the side of the receiving cavity (11) away from the air passage cavity (21). The heat exchange core (30) is placed in the accommodating cavity (11) and is provided with an inner circulation air duct and an outer circulation air duct for heat exchange between each other. The inner circulation air duct is connected to the air supply port (111) and the air return port (112), and the outer circulation air duct is connected to the first air outlet (211) and the second air outlet (212). An internal circulation fan (40), fixed relative to the outer casing (10), is used to drive air from the return air inlet (112) to the supply air inlet (111); and An external circulation fan (50) is fixed relative to the outer casing (10) and is used to drive air to flow from the air inlet (213) to the air outlet (214).

10. An electrical cabinet, characterized in that, Includes a cabinet (100) and a low-noise air heat exchanger (200) as described in claim 9, wherein the cabinet (100) has a first sidewall (101) perpendicular to a first direction and extending along a second direction, the outer shell (10) is embedded in the first sidewall (101) and 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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