Heat exchange core, air heat exchanger and electrical cabinet

Abstract

This invention discloses a heat exchange core, an air heat exchanger, and an electrical cabinet. The heat exchange core has several internal and external circulation air ducts arranged alternately along the Y-axis. Each internal circulation air duct has several pipes, both ends of which open onto a first side of the heat exchange core along the X-axis, forming an air supply end and a return end, respectively. Each air supply end and return end of each internal circulation air duct is arranged along the Z-axis. The external circulation air duct penetrates the heat exchange core along the Z-axis, with its two ends forming an air inlet end and an air outlet end, respectively. The air heat exchanger includes the aforementioned heat exchange core. The electrical cabinet includes the aforementioned air heat exchanger. This application features high heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation, specifically to a heat exchange core, an 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 the internal electrical equipment, electrical cabinets often employ a closed structure. Air heat exchangers can release heat from inside the electrical cabinet to the external environment through heat exchange; therefore, air heat exchangers are commonly used for cooling the internal components of electrical cabinets. An air heat exchanger consists of a heat exchange core with an internal circulation duct connected to the inside of the cabinet and an external circulation duct connected to the outside. The internal and external circulation ducts are arranged alternately. The internal circulation duct typically has top air intake and side exhaust, while the external circulation duct has bottom air intake and side exhaust. The airflow moves in opposite directions within the internal and external circulation ducts to achieve heat exchange. However, the heat exchange efficiency of this type of heat exchanger is still insufficient to meet the heat exchange requirements of electrical cabinets. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a heat exchange core, an air heat exchanger, and an electrical cabinet with high heat exchange efficiency.

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

[0005] Technical Solution 1 and its related embodiments provide a heat exchange core, which is provided with a plurality of internal circulation air ducts and external circulation air ducts arranged alternately along the Y-axis. The internal circulation air ducts are provided with a plurality of pipes, both ends of which open onto the first side of the heat exchange core along the X-axis and respectively form an air supply end and an air return end. Each air supply end and each air return end of each internal circulation air duct is arranged along the Z-axis. The external circulation air duct penetrates the heat exchange core along the Z-axis and its two ends respectively form an air inlet end and an air outlet end.

[0006] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the pipe is U-shaped and has a first section connected to the air supply end, a second section connected to the air return end, and a third section connecting the first section and the second section. The first section and the second section both extend along the X-axis direction, and the third section extends along the Z-axis direction. Each first section and the second section in each internal circulation air duct are arranged along the Z-axis direction, and each third section is arranged along the X-axis direction.

[0007] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the first segment is provided with a plurality of parallel first sub-inner air ducts, the second segment is provided with a plurality of parallel second sub-inner air ducts, and the third segment is provided with a plurality of parallel third sub-inner air ducts.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, the number of the first sub-inner air duct, the second sub-inner air duct and the third sub-inner air duct are equal and correspond one-to-one. The first sub-inner air duct and the corresponding third sub-inner air duct are connected, and the second sub-inner air duct and the corresponding third sub-inner air duct are connected.

[0009] Based on technical solution three, there is also technical solution five. In technical solution five and its related embodiments, a gap is formed between the first sub-inner air duct and the third sub-inner air duct, and a gap is formed between the second sub-inner air duct and the third sub-inner air duct.

[0010] Based on technical solution one, there is also technical solution six. In technical solution six and its related embodiments, the external circulation air duct is provided with a number of parallel sub-external air ducts extending along the Z-axis.

[0011] Technical Solution 7 and its related embodiments provide an air heat exchanger for installation in the cabinet of an electrical cabinet. The cabinet has a first side wall perpendicular to the X-axis direction and includes a heat exchange core, as described in any one of Technical Solutions 1 to 6. Each air supply end and each air return end of each internal circulation air duct forms an air supply port and an air return port, respectively. Each air inlet end and each air outlet end of each external circulation air duct forms an air inlet and an air outlet, respectively. A shell is embedded in the first side wall and used to accommodate the heat exchange core. The portion of the shell inside the cabinet has a first air outlet communicating with the air supply port and a second air outlet communicating with the air return port. The portion of the shell outside the cabinet has a third air outlet communicating with the air inlet and a fourth air outlet communicating with the air outlet. A first cooling fan is fixed relative to the shell and used to drive air from the air return port to the air supply port. A second cooling fan is fixed relative to the shell and used to drive air from the air inlet to the air outlet.

[0012] Based on technical solution seven, technical solution eight is also provided. In technical solution eight and its related embodiments, the bottom and top ends of the shell and the heat exchange core along the Z-axis direction respectively form a first interval and a second interval, and the third air outlet and the fourth air outlet are respectively connected to the first interval and the second interval; the third air outlet is located at the bottom of the shell along the Z-axis direction, and the fourth air outlet is located on the outside of the shell; the second heat dissipation fan is placed in the second interval, and the first heat dissipation fan is fixed to the first air outlet of the shell.

[0013] Based on technical solution eight, there is also technical solution nine. In technical solution nine and its related embodiments, the third air outlet is located at the bottom and outer side of the first interval, and the fourth air outlet is located on the outer side of the second interval and is higher than the second cooling fan.

[0014] Technical solution ten and its related embodiments provide an electrical cabinet, which includes a cabinet body and an air heat exchanger as described in any one of technical solutions seven to nine; the cabinet body is provided with a first side wall perpendicular to the X-axis direction, and the housing is embedded in the first side wall; the first air outlet and the second air outlet are both located inside the cabinet body, and the third air outlet and the fourth 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] Through continuous observation, experimentation, and research, the applicant has learned that the reason for the technical problem of "poor heat exchange efficiency of the heat exchanger" in the existing technical solution is that after the heat exchanger has been exchanging heat for a long time, dust is easily accumulated at the top corner of the external circulation air duct, and the heat exchange time of the internal circulation air duct is short and the heat exchange is insufficient.

[0017] In technical solution one and its preferred embodiments, the external circulation duct runs through the heat exchange core along the Z-axis and its two ends form an air inlet and an air outlet, respectively. Therefore, the external circulation duct has low air resistance and is not prone to dust accumulation. The internal circulation duct includes several pipes, both ends of which open onto the first side of the heat exchange core along the X-axis and form an air supply end and a return end, respectively. Each air supply end and return end of each internal circulation duct is arranged along the Z-axis. The pipes have high air resistance, and the airflow stays in the internal circulation duct for a longer time. However, it should be understood that although the air resistance of the pipes increases, the airflow velocity inside the pipes is still... The internal and external circulation ducts are arranged alternately along the Y-axis, allowing for efficient heat exchange between the internal and external airflows, thus improving heat exchange efficiency. The internal circulation duct, with its numerous pipes and structural design, ensures airflow passes through all parts of the duct, preventing air from escaping from the portion furthest from the heat exchange core along the X-axis, further enhancing the heat exchange efficiency of both the internal and external circulation ducts. Therefore, the external circulation duct in this design is less prone to dust accumulation, and the heat exchange efficiency between the internal and external circulation ducts is high. (Influences on heat exchange effect include heat transfer coefficient and heat transfer area; higher air velocity is preferable.)

[0018] In the second technical solution and its preferred embodiment, the structure of the pipeline is more conducive to production and processing than other complex shapes, and it is also more conducive to achieving a balance between wind resistance and wind speed, thereby increasing the heat exchange efficiency of the internal and external circulation ducts.

[0019] In the third technical solution and its preferred embodiment, the first section is provided with several parallel first sub-inner air ducts, the second section is provided with several parallel second sub-inner air ducts, and the third section is provided with several parallel third sub-inner air ducts. Compared with the solution that does not provide sub-inner air ducts in the pipe, the heat exchange area of ​​the pipe is larger, which further increases the heat exchange efficiency of the inner circulation air duct and the outer circulation air duct.

[0020] In the fourth technical solution and its preferred embodiment, the first sub-inner air duct is connected to the corresponding third sub-inner air duct, and the second sub-inner air duct is connected to the corresponding third sub-inner air duct, which helps to avoid excessive wind resistance.

[0021] In technical solution five and its preferred embodiments, a gap is formed between the first sub-inner air duct and the third sub-inner air duct, and a gap is formed between the second sub-inner air duct and the third sub-inner air duct. Compared with technical solution four, it is not necessary to connect the first sub-inner air duct and the third sub-inner air duct, nor is it necessary to connect the third sub-inner air duct and the second sub-inner air duct. This eliminates the splicing step, which is beneficial for processing. Moreover, when the internal circulation airflow enters the gap between the first and second sub-inner air ducts after passing through each of the first sub-inner air ducts, it changes from laminar flow to turbulent flow and mixes and homogenizes in the gap. Then, it becomes laminar flow again after passing through each of the third sub-inner air ducts, and then changes from laminar flow to turbulent flow again after passing through the gap between the third and second sub-inner air ducts and mixes and homogenizes in the gap. Finally, it becomes laminar flow again after passing through each of the second sub-inner air ducts. The turbulence at the gap increases the heat exchange efficiency at the corner of the U-shaped pipe and improves the temperature uniformity of the internal circulation airflow at each air outlet.

[0022] In technical solution six and its preferred embodiments, the external circulation duct is provided with several parallel sub-external ducts extending along the Z-axis. Compared with the solution where only one sub-external duct is formed in the external circulation duct, the heat exchange area of ​​the external circulation duct is larger, which further increases the heat exchange efficiency of the internal circulation duct and the external circulation duct.

[0023] Technical solution seven and its preferred embodiments have the technical advantages of any one of technical solutions one to six.

[0024] In technical solution eight and its preferred embodiment, the bottom and top ends of the shell and the heat exchange core along the Z-axis form a first interval and a second interval, respectively. The third air outlet and the fourth air outlet are connected to the first interval and the second interval, respectively. The setting of the first interval is conducive to the air intake of each external circulation air duct. The setting of the second interval is conducive to the placement of the second heat dissipation fan. This arrangement makes the third air outlet and the fourth air outlet located at the bottom and top ends of the shell, respectively. The air outlet of the fourth air outlet is discharged upward, which is not easy to enter the third air outlet and cause a heat island effect.

[0025] In technical solution nine and its preferred embodiments, the third air outlet is located at the bottom and outer side of the first interval, which is conducive to increasing the air intake volume. The fourth air outlet is located on the outer side of the second interval and is higher than the second heat dissipation fan, which is conducive to forming a structure in which the part of the shell located outside the cabinet forms a bottom air intake and side air outlet, improving the protection of the external circulation air duct and making the external circulation air duct less prone to dust accumulation.

[0026] Technical solution ten has the technical advantages of any one of technical solutions seven to nine. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. 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 schematic diagram of the heat exchange core in an embodiment of this application;

[0030] Figure 3 for Figure 1 The left view;

[0031] Figure 4 for Figure 3 Sectional view along the AA direction;

[0032] Figure 5 for Figure 3 Sectional view in the BB direction;

[0033] Figure 6 for Figure 5 Sectional view in the CC direction;

[0034] Figure 7 for Figure 5 Sectional view in the DD direction.

[0035] Explanation of key figure labels:

[0036] Cabinet 100; First side wall 101; Air heat exchanger 200; Heat exchange core 10; Internal circulation air duct 11; Pipe 110; First section 111; First sub-internal air duct 1111; Second section 112; Second sub-internal air duct 1121; Third section 113; Third sub-internal air duct 1131; Air supply end 114; Air return end 115; Air supply outlet 01; Air return outlet 02; External circulation air duct 12; Sub-external air duct 121; Air inlet end 122; Air outlet end 123; Air inlet 03; Air outlet 04; Shell 20; First air outlet 21; Second air outlet 22; Third air outlet 23; Fourth air outlet 24; First partition 25; Second partition 26; First cooling fan 30; Second cooling fan 40. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention 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 invention without creative effort are within the scope of protection of the present invention.

[0038] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0039] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, 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 the invention and simplifying the description, and is not intended to 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 scope of protection of this invention.

[0040] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should 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 by other means or components.

[0041] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0042] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" only refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. The X-axis direction can be divided into left and right, the Y-axis direction into front and back, and the Z-axis direction into up and down.

[0043] See Figure 1 , Figure 1 An electrical cabinet is shown, including a cabinet body 100 and an 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 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, with its length direction along the X-axis, its width direction along the Y-axis, and its height direction along the Z-axis. The cabinet body 100 has a first side wall 101 perpendicular to the X-axis.

[0044] See Figure 1-7 An air heat exchanger 200 is installed on the first side wall 101 and includes a heat exchange core 10, a shell 20, a first heat dissipation fan 30, and a second heat dissipation fan 40.

[0045] See Figure 2 The heat exchange core 10 is rectangular and has several internal circulation ducts 11 and external circulation ducts 12 arranged alternately along the Y-axis.

[0046] See Figure 3-4 , Figure 6-7 The internal circulation air duct 11 is provided with several pipes 110. Both ends of the pipes 110 are open to the first side of the heat exchange core 10 along the X-axis and form an air supply end 114 and a return air end 115 respectively. Each air supply end 114 and each return air end 115 of each internal circulation air duct 11 is arranged along the Z-axis. Each air supply end 114 and each return air end 115 of each internal circulation air duct 11 forms an air supply port 01 and a return air port 02 respectively.

[0047] The duct 110 is U-shaped and has a first section 111 connected to the air supply end 114, a second section 112 connected to the air return end 115, and a third section 113 connected to the first section 111 and the second section 112. The first section 111 and the second section 112 both extend along the X-axis, and the third section 113 extends along the Z-axis. Each first section 111 and each second section 112 in each internal circulation duct 11 is arranged along the Z-axis, and each third section 113 is arranged along the X-axis.

[0048] The first segment 111 contains several parallel first sub-internal air ducts 1111, the second segment 112 contains several parallel second sub-internal air ducts 1121, and the third segment 113 contains several parallel third sub-internal air ducts 1131. In practical applications, the first segment 111, the second segment 112, and the third segment 113 are respectively provided with heat exchange fins to form each first sub-internal air duct 1111, each second sub-internal air duct 1121, and each third sub-internal air duct 1131. In this embodiment, a gap is formed between the first sub-internal air ducts 1111 and the third sub-internal air ducts 1131, and a gap is formed between the second sub-internal air ducts 1121 and the third sub-internal air ducts 1131. However, it should be understood that in other embodiments, the number of the first sub-inner air duct 1111, the second sub-inner air duct 1121 and the third sub-inner air duct 1131 are equal and correspond one-to-one, the first sub-inner air duct 1111 and the corresponding third sub-inner air duct 1131 are connected, and the second sub-inner air duct 1121 and the corresponding third sub-inner air duct 1131 are connected.

[0049] See Figure 5-7 The external circulation duct 12 extends through the heat exchange core 10 along the Z-axis, with an air inlet 122 and an air outlet 123 at its two ends. Each air inlet 122 and air outlet 123 of the external circulation duct 12 forms an air inlet 03 and an air outlet 04, respectively. The external circulation duct 12 contains several parallel sub-external air ducts 121 extending along the Z-axis. In practical applications, heat exchange fins are fixed within each external circulation duct 12 to form multiple sub-external air ducts 121.

[0050] See Figure 1 , Figure 4-5 The housing 20 is embedded in the first side wall 101 and is used to accommodate the heat exchange core 10. The part of the housing 20 located inside the cabinet 100 is provided with a first air vent 21 connected to the air supply vent 01 and a second air vent 22 connected to the air return vent 02. The part of the housing located outside the cabinet 100 is provided with a third air vent 23 connected to the air inlet 03 and a fourth air vent 24 connected to the air outlet 04. In this embodiment, the shell 20 is rectangular. The length of the shell 20 along the X-axis is similar to the length of the heat exchange core 10 along the X-axis. The length of the shell 20 along the Y-axis is similar to the length of the heat exchange core 10 along the Y-axis. However, the height of the shell 20 along the Z-axis is higher than that of the heat exchange core 10. The bottom and top ends of the shell 20 and the heat exchange core 10 along the Z-axis form a first gap 25 and a second gap 26, respectively. The third air vent 23 and the fourth air vent 24 are connected to the first gap 25 and the second gap 26, respectively. The third air vent 23 is located at the bottom and outer side of the first gap 25, and the fourth air vent 24 is located at the outer side of the second gap 26.

[0051] The first cooling fan 30 is fixed relative to the housing 20 and is used to drive the air from the return air port 02 to the supply air port 01. In this embodiment, the first cooling fan 30 is fixed to the first air port 21 of the housing 20.

[0052] The second cooling fan 40 is fixed relative to the housing 20 and is used to drive air to flow from the air inlet 03 to the air outlet 04. In this embodiment, the second cooling fan 40 is placed at the second interval and is lower than the fourth air outlet 24, that is, the fourth air outlet 24 is higher than the second cooling fan 40.

[0053] In this embodiment, the external circulation duct 12 penetrates the heat exchange core 10 along the Z-axis direction, and its two ends form an air inlet 122 and an air outlet 123, respectively. Therefore, the external circulation duct 12 has low air resistance and is not prone to dust accumulation. The internal circulation duct 11 includes several pipes 110. Both ends of the pipes 110 are open to the first side of the heat exchange core 10 along the X-axis direction and form an air supply end 114 and a return end 115, respectively. Each air supply end 114 and each return end 115 of each internal circulation duct 11 is arranged along the Z-axis direction. The air resistance of the pipes 110 is high, and the airflow stays in the internal circulation duct 11 for a longer time. However, it should be understood that although the air resistance of the pipes 110 is increased, the airflow stays in the internal circulation duct 11 for a longer time. The airflow velocity remains relatively high. Since the internal circulation duct 11 and the external circulation duct 12 are alternately arranged along the Y-axis, the internal circulation airflow can fully exchange heat with the external circulation airflow, thereby improving the heat exchange efficiency. Among them, the internal circulation duct 11 is provided with several pipes 110, and the structural design of the pipes 110 also allows the airflow to flow through all parts of the internal circulation duct 11, avoiding the part far from the heat exchange core 10 along the first side of the X-axis from not being exposed to airflow, thereby further improving the heat exchange efficiency of the internal circulation duct 11 and the external circulation duct 12. Therefore, the external circulation duct 12 of this technical solution is not prone to dust accumulation, and the heat exchange efficiency of the internal circulation duct 11 and the external circulation duct 12 is high.

[0054] In this embodiment, the structure of the pipe 110 is more complex than other pipes 110. On the one hand, it is beneficial to production and processing. On the other hand, it is more conducive to achieving a balance between wind resistance and wind speed, thereby increasing the heat exchange efficiency of the internal circulation duct 11 and the external circulation duct 12.

[0055] In this embodiment, the first segment 111 is provided with a plurality of parallel first sub-inner air ducts 1111, the second segment 112 is provided with a plurality of parallel second sub-inner air ducts 1121, and the third segment 113 is provided with a plurality of parallel third sub-inner air ducts 1131. Compared with the scheme in which no sub-inner air ducts are provided in the pipe 110, the heat exchange area of ​​the pipe 110 is larger, which further increases the heat exchange efficiency of the inner circulation air duct 11 and the outer circulation air duct 12.

[0056] In this embodiment, a gap is formed between the first sub-inner air duct 1111 and the third sub-inner air duct 1131, and a gap is formed between the second sub-inner air duct 1121 and the third sub-inner air duct 1131. It is unnecessary for the first sub-inner air duct 1111 and the third sub-inner air duct 1131 to be connected, nor is it necessary for the third sub-inner air duct 1131 to be connected to the second sub-inner air duct 1121. This eliminates the splicing step, which is beneficial for processing. Furthermore, the internal circulation airflow enters the first sub-inner air duct 1111 after passing through each of the first sub-inner air ducts 1111. The flow changes from laminar to turbulent at the gap between the first and second sub-internal air ducts 1111 and mixes and homogenizes within this gap. Then, it passes through each of the third sub-internal air ducts 1131 and returns to laminar flow. Next, it passes through the gap between the third sub-internal air duct 1131 and the second sub-internal air duct 1121 and returns to turbulent flow again, mixing and homogenizing within this gap. Finally, it passes through each of the second sub-internal air ducts 1121 and returns to laminar flow. The turbulence at the gaps increases the heat exchange efficiency at the corners of the U-shaped pipe 110 and improves the temperature uniformity of the internal circulating airflow at each outlet 123. In other embodiments, the first sub-internal air duct 1111 is connected to the corresponding third sub-internal air duct 1131, and the second sub-internal air duct 1121 is connected to the corresponding third sub-internal air duct 1131, which helps to avoid excessive wind resistance.

[0057] In this embodiment, the external circulation duct 12 is provided with a number of parallel sub-external ducts 121 extending along the Z-axis. Compared with the scheme where only one sub-external duct 121 is formed in the external circulation duct 12, the heat exchange area of ​​the external circulation duct 12 is larger, which further increases the heat exchange efficiency of the internal circulation duct 11 and the external circulation duct 12.

[0058] In this embodiment, the bottom and top ends of the housing 20 and the heat exchange core 10 along the Z-axis form a first gap 25 and a second gap 26, respectively. The third air outlet 23 and the fourth air outlet 24 are connected to the first gap 25 and the second gap 26, respectively. The arrangement of the first gap 25 facilitates air intake at the air inlet 122 of each external circulation air duct 12, while the arrangement of the second gap 25 facilitates the placement of the second cooling fan 40. This arrangement allows the third air outlet 23 and the fourth air outlet 24 to be located at the bottom and top ends of the housing 20, respectively. The air outlet of the fourth air outlet 24 is discharged upwards, making it less likely to enter the third air outlet 23 and cause a heat island effect. The third air outlet 23 is located at the bottom and outer side of the first gap 25, which helps to increase the air intake volume. The fourth air outlet 24 is located on the outer side of the second gap 26 and is higher than the second cooling fan 40, which helps to form a structure in which the part of the housing 20 outside the cabinet has a bottom air intake and a side air outlet, improving the protection of the external circulation air duct and making it less prone to dust accumulation.

[0059] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention 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 invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A heat exchange core (10), characterized in that, The heat exchange core (10) is provided with a plurality of internal circulation air ducts (11) and external circulation air ducts (12) arranged alternately along the Y-axis. The internal circulation air duct (11) is provided with a plurality of pipes (110). Both ends of the pipes (110) are open on the first side of the heat exchange core (10) along the X-axis and form an air supply end (114) and a return air end (115) respectively. Each air supply end (114) and each return air end (115) of each internal circulation air duct (11) is arranged along the Z-axis. The external circulation air duct (12) penetrates the heat exchange core (10) along the Z-axis and forms an air inlet end (122) and an air outlet end (123) at both ends respectively. The X-axis, Y-axis and Z-axis are perpendicular to each other. The pipe (110) is U-shaped and has a first section (111) connected to the air supply end (114), a second section (112) connected to the air return end (115), and a third section (113) connecting the first section (111) and the second section (112). The first segment (111) has several parallel first sub-inner air ducts (1111), the second segment (112) has several parallel second sub-inner air ducts (1121), and the third segment (113) has several parallel third sub-inner air ducts (1131). A gap is formed between the first sub-inner air duct (1111) and the third sub-inner air duct (1131), and a gap is formed between the second sub-inner air duct (1121) and the third sub-inner air duct (1131). When the internal circulation airflow enters the gap between the first sub-inner air duct (1111) and the third sub-inner air duct (1131), it changes from laminar flow to turbulent flow and mixes and homogenizes in the gap. Then it passes through the third sub-inner air duct (1131) and becomes laminar flow again. Then it passes through the gap between the third sub-inner air duct (1131) and the second sub-inner air duct (1121) and changes from laminar flow to turbulent flow and mixes and homogenizes in the gap. Finally, it passes through the second sub-inner air duct (1121) and becomes laminar flow again.

2. The heat exchange core (10) as described in claim 1, characterized in that, The first segment (111) and the second segment (112) both extend along the X-axis direction, and the third segment (113) extends along the Z-axis direction; each first segment (111) and each second segment (112) in each internal circulation duct (11) are arranged along the Z-axis direction, and each third segment (113) is arranged along the X-axis direction.

3. The heat exchange core (10) as described in claim 1, characterized in that, The external circulation duct (12) is provided with several parallel sub-external ducts (121) extending along the Z-axis.

4. An air heat exchanger (200) for installation in a cabinet (100) of an electrical cabinet, said cabinet (100) having a first sidewall (101) perpendicular to the X-axis direction, characterized in that, include The heat exchange core (10) is as described in any one of claims 1-3; each air supply end (114) and each air return end (115) of each internal circulation duct (11) forms an air supply port (01) and an air return port (02) respectively, and each air inlet end (122) and each air outlet end (123) of each external circulation duct (12) forms an air inlet (03) and an air outlet (04) respectively. The housing (20) is embedded in the first side wall (101) and used to accommodate the heat exchange core (10). The part of the housing located inside the cabinet (100) is provided with a first air outlet (21) communicating with the air supply outlet (01) and a second air outlet (22) communicating with the return air outlet (02). The part of the housing located outside the cabinet (100) is provided with a third air outlet (23) communicating with the air inlet (03) and a fourth air outlet (24) communicating with the air outlet (04). A first cooling fan (30), which is fixed relative to the housing (20) and is used to drive air from the return air inlet (02) to the supply air inlet (01); and The second cooling fan (40) is fixed relative to the housing (20) and is used to drive air from the air inlet (03) to the air outlet (04).

5. An air heat exchanger (200) as described in claim 4, characterized in that, The shell (20) and the heat exchange core (10) form a first interval (25) and a second interval (26) at the bottom and top of the Z-axis, respectively. The third air outlet (23) and the fourth air outlet (24) are connected to the first interval (25) and the second interval (26), respectively. The second heat dissipation fan (40) is placed in the second interval (26), and the first heat dissipation fan (30) is fixed to the first air outlet (21) of the shell (20).

6. An air heat exchanger (200) as described in claim 5, characterized in that, The third air vent (23) is located at the bottom and outer side of the first interval (25), and the fourth air vent (24) is located on the outer side of the second interval (26) and is higher than the second cooling fan (40).

7. An electrical cabinet, characterized in that, It includes a cabinet (100) and an air heat exchanger (200) as claimed in any one of claims 4-6.

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