Thermal management device

Abstract

The present invention discloses a thermal management device, which includes a sensing unit and a tube body. The sensing unit includes a temperature sensing part. The sensing unit is located in the tube body cavity and is arranged in a gap with the inner wall of the guide tube main body. The first opening of the tube body is relatively close to the outlet of the first channel, so that the sensing unit obtains temperature information relatively accurately.

Description

Technical Field

[0001] The present invention relates to the field of thermal management technology, and in particular to a thermal management device. Background Art

[0002] In a thermal management system, the temperature of the thermal management device is usually obtained through a temperature sensor to determine the heat exchange condition of the thermal management device. Therefore, it is very important to obtain accurate temperature information. Summary of the Invention

[0003] The purpose of this application is to provide a thermal management device to improve the accuracy of temperature information obtained through a sensing unit.

[0004] One embodiment of the technical solution of the present application provides a thermal management device, the thermal management device comprising a heat exchange core, a first plate and a second plate, the heat exchange core comprising a plurality of stacked plates, wherein the plates of the heat exchange core are located between the first plate and the second plate along the stacking direction of the plates, the heat exchange core comprising a bottom plate and a top plate, the first plate being fixed to the top plate; the heat exchange core comprising a first channel, the first channel having an outlet on the bottom plate; the thermal management device comprising a pipe body and a sensor unit, the pipe body comprising a connecting wall, the connecting wall being fixed to the plates or the first plate; the pipe body comprising a main body, the main body being located in the first channel, and part of the sensor unit being located in a cavity of the main body;

[0005] The tube body includes a first port, which faces the first channel outlet and is close to the bottom plate along the axial direction of the tube body relative to the top plate; the sensing unit includes a temperature sensing part, which is located between the first channel outlet and the first port along the axial direction of the tube body, and / or the temperature sensing part is located in the cavity of the main body.

[0006] The thermal management device provided in the above-mentioned embodiment of the present application includes a sensing unit and a tube body. The sensing unit includes a temperature sensing part. The first port of the tube body is relatively close to the outlet of the first channel. Along the axial direction of the tube body, the temperature sensing part is located between the outlet of the first channel and the first port, and / or the temperature sensing part is located in the cavity of the main body. In this way, the temperature sensing part is close to the outlet of the first channel, and the sensing unit obtains temperature information more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic diagram of the three-dimensional structure of a first embodiment of a thermal management device;

[0008] Figure 2 is a schematic diagram of the three-dimensional structure of a second embodiment of the thermal management device;

[0009] Figure 3 yes Figure 2 An exploded schematic diagram of a thermal management device;

[0010] Figure 4 yes Figure 1 and Figure 2 A top view of the thermal management device;

[0011] Figure 5 yes Figure 4 A schematic diagram of a first cross-sectional view of the thermal management device along AA;

[0012] Figure 6 yes Figure 4 A second cross-sectional view of the thermal management device along AA;

[0013] Figure 7 yes Figure 5 A magnified schematic diagram of part A in the middle;

[0014] Figure 8 yes Figure 5 A magnified schematic diagram of part B in the middle;

[0015] Figure 9 yes Figure 5 Schematic diagram of the cooperation between the sensing unit and the connecting seat;

[0016] Figure 10 yes Figure 1 Schematic diagram of the coordination between the first plate, the sensor unit and the tube;

[0017] Figure 11 Yes Figure 4 Schematic cross-sectional view of the thermal management device along BB. DETAILED DESCRIPTION

[0018] See also Figure 1 、 Figure 4 、 Figure 5 、 Figure 11 as well as Figure 7-Figure 9The thermal management device 1000 includes a first plate 1200, a second plate 1300, and a heat exchange core 1100. The heat exchange core 1100 includes a plurality of stacked plates. Along the stacking direction of the plates, the plates of the heat exchange core are located between the first plate 1200 and the second plate 1300. The first plate 1200 is fixed to the top plate 1102 of the heat exchange core 1100, and the second plate 1300 is fixed to the bottom plate 1101 of the heat exchange core 1100. In heat exchange core 1100, stacked plates form first and second inter-plate channels. With the exception of top plate 1102 and bottom plate 1101, one side of the inner plates serves as the first inter-plate channel, while the other side of the inner plates serves as the second inter-plate channel. In this embodiment, adjacent plates have identical structures. For ease of description, one of two adjacent plates is defined as the first plate and the other as the second plate. For example, a first plate and one of its two adjacent second plates form a first inter-plate channel, while the first plate and the second plate form a second inter-plate channel. The first and second inter-plate channels are relatively disconnected. Refrigerant in the first inter-plate channel and refrigerant in the second inter-plate channel can exchange heat.

[0019] It should be noted that the relative disconnection between the first and second inter-plate channels refers to a lack of connection within the heat exchange core 1100. Once the thermal management device 1000 becomes part of the thermal management system, this connection may occur. The main body of the first plate 1200 and the main body of the second plate 1300 are thicker than the main body of the plates, enhancing the mechanical strength of the thermal management device 1000.

[0020] See also Figure 5 as well as Figure 11The thermal management device has refrigerant flow channels and coolant flow channels. The refrigerant flow channels include a first flow channel, which includes a first hole 1110, a second hole 1120, and a first inter-plate channel. The first hole 1110 can communicate with the second hole 1120 through the first inter-plate channel. The coolant flow channel includes a third hole 1130, a fourth hole 1140, and a second inter-plate channel. The third hole 1130 can communicate with the fourth hole 1140 through the second inter-plate channel. The refrigerant flowing through the first flow channel and the coolant flowing through the coolant flow channel can exchange heat. The thermal management device 1000 includes a first inlet 1001, a first outlet 1002, a coolant outlet 1004, and a coolant inlet 1003. In this embodiment, the first inlet 1001 and the first outlet 1002 are connected to the refrigerant flow channel. The coolant outlet 1004 and the coolant inlet 1003 are connected to the coolant flow channel. In this embodiment, the first inlet 1001 and the first outlet 1002 are formed in the second plate 1300 or in a pipe or block structure fixed to the second plate. The coolant outlet 1004 and the coolant inlet 1003 are formed in a pipe fixed to the first plate 1200. The coolant inlet 1003 communicates with the third channel 1130, and the coolant outlet 1004 communicates with the fourth channel 1140. The coolant enters the third channel 1130 through the coolant inlet 1003, then enters the second inter-plate channel of the heat exchange core 1100, and then enters the fourth channel 1140 and exits the thermal management device 1000 through the coolant outlet 1004.

[0021] Thermal management device 1000 includes a sensor unit 1500, a connector 1600, and a tube 1400. Connector 1600 is fixed to first plate 1200 or integrally formed with first plate 1200. Connector 1600 and first plate 1200 may be fixed by welding, such as by welding the lower wall of connector 1600 to first plate 1200. Connector 1600 has a first hole 1601, with openings on both the upper and lower walls of connector 1600. The opening of first hole 1601 on the lower wall of connector 1600 at least partially faces the first channel. Connector 1600 includes a first accommodating portion 1610 and a second accommodating portion 1620. The area enclosed by the walls of first and second accommodating portions 1610, 1620 constitutes part or all of first hole 1601, with first accommodating portion 1610 being closer to first plate 1200 than second accommodating portion 1620. The tube body 1400 includes a stopper 1430 and a main body 1420. At least a portion of the stopper 1430 is located on one side of the first plate 1200, and at least a portion of the main body 1420 is located on the other side of the plate. The outer diameter of the stopper 1430 is larger than the outer diameter of the main body 1420. In this embodiment, the stopper 1430 is located in the first hole 1601 and abuts against the first receiving portion 1610, or is welded to the first receiving portion 1610 to prevent the tube body 1400 from moving toward the second plate 1300. Furthermore, when the thermal management device 1000 is welded, the cooperation between the stopper 1430 and the first receiving portion 1610 prevents the tube body 1400 from shifting, thereby preventing weld leaks. The first plate 1200 has a receiving hole 1210. The opening of the receiving hole 1210 formed on the lower wall of the first plate 1200 faces the first channel 1110. The receiving hole 1210 also has an opening on the upper wall of the first plate 1200. Part of the main body 1420 is located in the receiving hole 1210. The sensing unit 1500 includes a connecting portion 1520. The connecting portion 1520 is located in the first hole 1601. The connecting portion 1520 is fixedly connected to the second receiving portion 1620. The connection between the connecting portion 1520 and the second receiving portion 1620 is sealed. The fixing method of the connecting portion 1520 and the second receiving portion 1620 can be a threaded connection. A sealing ring is provided between the connecting portion 1520 and the second receiving portion 1620 to improve the sealing performance and prevent refrigerant leakage.

[0022] See also Figure 5 and Figure 7The tube body 1400 has a first port 1401, which faces the outlet 1111 of the first channel. Along the axis of the tube body 1400, the first port 1401 is relatively close to the bottom plate 1101 of the heat exchange core 1100 relative to the top plate 1102 of the heat exchange core 1100. The heat exchange core 1100 includes a first baffle 1150, which is an integral structure with the plate. The first baffle 1150 is located in the first channel 1110. The first channel includes a first cavity 1112 and a second cavity 1113. The first cavity 1112 is located on one side of the first baffle 1150, and the second cavity 1113 is located on the other side of the first baffle 1150. The first cavity 1112 and the second cavity 1113 are relatively disconnected. The first cavity 1112 is closer to the second plate 1300 than the second cavity 1113. The first cavity 1112 is connected to the outlet of the first channel 1110. The first partition 1150 has a first opening 1152 and includes a first mating wall 1151. The area enclosed by the first mating wall 1151 includes the first opening 1152. The tube body 1400 includes a first connecting wall 1411. The first connecting wall 1411 can be adjacent to the first opening 1401. The first mating wall 1151 is fixedly connected to the first connecting wall 1411, and a seal is provided at the connection between the first mating wall 1151 and the first connecting wall 1411. In one specific embodiment, the first partition 1150 includes a flange. The area enclosed by the flange of the first partition 1150 is the first opening 1152 or a portion of the first opening 1152. The first mating wall 1151 is formed on the flange of the first partition. The tube body 1400 is located within the first opening 1152. The first connecting wall 1411 is formed on the outer wall of the tube body 1400. The first opening 1401 is located in the first cavity 1112, which is in communication with the first opening 1401. Of course, the flange of the first partition 1150 can also be located in the cavity of the tube body 1400. In this case, the first connecting wall 1411 is located on the inner wall of the tube body 1400, and the first cavity 1112 is connected to the cavity of the tube body 1400 through the first orifice 1152. The first partition 1150 divides the first channel into a first cavity 1112 and a second cavity 1113. The first cavity 1112 is the outflow cavity of the refrigerant. The sensing unit 1500 includes a temperature sensing portion 1510. The temperature sensing portion 1510 can obtain a temperature signal. When the temperature sensing portion 1510 is located in the cavity of the tube body 1400, a gap is set between the temperature sensing portion 1510 and the inner wall of the tube body to prevent the tube body from interfering with the temperature sensing portion 1510. At this time, the refrigerant in the first cavity enters the cavity of the tube body 1400, and the temperature sensing portion 1510 obtains the refrigerant temperature relatively close to the first outlet. In other embodiments, the temperature sensing portion 1510 extends out of the tube body and is located in the first cavity 1112 . The temperature sensing portion 1510 directly contacts the refrigerant in the first cavity 1112 , thereby obtaining temperature information of the refrigerant.The temperature sensing portion 1510 is located in the cavity of the tube body 1400 or the first cavity 1112 , and the refrigerant in the first cavity 1112 has basically completed heat exchange in the heat exchange core 1100 . In this way, the refrigerant temperature signal obtained by the temperature sensing portion 1510 is relatively accurate.

[0023] See also Figure 8 The heat exchange core 1100 may further include a second baffle 1160. The second baffle 1160 is integrally formed with the top plate 1102 of the heat exchange core 1100 or with the first plate 1200. The lower wall of the second baffle 1160 faces the first channel 1110. The second baffle 1160 has a second opening 1162. The second baffle 1160 includes a second mating wall 1161. The area enclosed by the second mating wall 1161 includes the second opening 1162. The connecting wall of the tube body 1400 includes a second connecting wall 1412. The second mating wall 1161 is fixedly connected to the second connecting wall 1412. A seal is provided at the connection between the second mating wall 1161 and the second connecting wall 1412. The mating manner between the second connecting wall 1412 and the second mating wall 1161 is the same as the mating manner between the first connecting wall 1411 and the first mating wall 1151, and will not be described in detail. The thermal management device 1000 is provided with a second partition 1160, which not only facilitates the fixation of the tube 1400, but also prevents leakage of refrigerant in the second chamber 1113. When the second partition 1160 and the top plate 1102 are integrally structured, the first plate has a receiving hole 1210 for receiving part of the tube.

[0024] See also Figure 1 and Figure 5In this embodiment, the thermal management device 1000 further includes a throttling unit 1700, which includes a valve body 1710, a valve core 1720, a valve port 1730, and a guide tube 1740. The valve body 1710 is fixed to the first plate 1200, the valve port 1730 is fixed to the valve body 1710, the valve port 1730 has a valve port 1731, and the valve core 1720 can adjust the opening of the valve port 1731. At least a portion of the guide tube 1740 is located in the second channel 1120. The first end 1741 of the guide tube 1740 is fixed relative to the valve port 1730 of the throttling unit 1700. The cavity of the guide tube 1740 is connected to the valve port 1731, and the valve port 1731 is connected to the second channel 1120. The second end 1742 of the guide tube 1740 is fixed to the second plate 1300. The first inlet 1001 is connected to the port located at the second end, and thus the first inlet 1001 is connected to the cavity of the guide tube 1740. The heat exchange core also includes a third partition 1170. The third partition 1170 is located in the second channel 1120 and has a hole that accommodates a portion of the guide tube 1740. The third partition 1170 is fixedly connected to the guide tube 1740 and sealed at the connection. Along the axial direction of the first channel 1110, the third partition 1170 is closer to the first plate 1200 than the first partition 1150. The third partition 1170 divides the second channel into a relatively non-connected third cavity 1121 and a fourth cavity 1122. The third cavity 1121 is closer to the first plate 1200 than the fourth cavity 1122.

[0025] See also Figure 5 When thermal management device 1000 is operating, refrigerant enters the cavity of guide tube 1740 through first inlet 1001 and then enters valve port 1731. Valve core 1720 adjusts the opening of valve port 1731, thereby reducing the pressure of the refrigerant. The reduced-pressure refrigerant enters third cavity 1121 and then enters second cavity 1113 through the first inter-plate passage. Due to the obstruction of first partition plate 1150, the refrigerant in second cavity 1113 flows into fourth cavity 1122. The refrigerant in fourth cavity 1122 flows toward second plate 1300 and then into first cavity 1112. Temperature sensor 1510 in first cavity 1112 detects the temperature of the refrigerant before it leaves thermal management device 1000 through first outlet 1002. In other embodiments, thermal management device 1000 may not include throttling unit 1700, and the refrigerant entering first inlet 1001 may already be throttled by another throttling device.

[0026] See also Figure 10The second embodiment is shown. In this embodiment, the thermal management device 1000 does not include the connection seat 1600. The tube body 1400 includes a third connecting wall 1413, which is formed on the outer wall of the limiting portion 1430. The first plate body 1200 includes a third mating wall 1221, which is formed on the upper wall of the first plate body 1200. The third mating walls 1221 are distributed circumferentially along the receiving hole 1210 of the first plate body 1200. The third mating walls 1221 are fixedly connected to the third connecting wall 1413, which can be fixed by welding. The connection between the third mating walls 1221 and the third connecting wall 1413 is sealed. At this time, the limiting portion 1430 has at least two functions. One of them is to limit the tube body 1400 to prevent the tube body 1400 from moving toward the second plate body 1300 when the thermal management device 1000 is welded; the other function is to fix the tube body 1400 to the first plate body 1200 to make the tube body 1400 more secure.

[0027] In this embodiment, the second accommodating portion 1620 is also formed on the inner wall of the tube body 1400. The area enclosed by the second accommodating portion 1620 is part of the cavity of the tube body 1400. The connecting portion 1520 of the sensing unit 1500 is located in the cavity of the tube body 1400. The tube body 1400 includes a second port 1402. Along the axial direction of the tube body 1400, the second accommodating portion 1620 is located between the limiting portion 1430 and the second port 1402. The second accommodating portion 1620 can be formed with an internal thread, and the outer wall of the connecting portion 1520 is formed with an external thread, and the two cooperate to fix the sensing unit 1500.

[0028] When assembling the thermal management device 1000 , after the heat exchange core 1100 , the tube body 1400 and the connecting seat 1600 are welded and fixed, the sensor unit 1500 is inserted into the cavity of the tube body 1400 , and the connecting portion 1520 is sealed and fixed to the second receiving portion 1620 .

[0029] See also Figure 2 、 Figure 3 and Figure 6In the third embodiment shown, the heat exchange core 1100 includes a first heat exchange part 1010, a second heat exchange part 1020 and a connecting plate body 1800. The first flow channel and the coolant flow channel are located in the first heat exchange part 1010. The upper wall of the connecting plate body 1800 is fixed to the bottom plate 1101 of the first heat exchange part 1010, the lower wall of the connecting plate body 1800 is fixed to the top plate of the second heat exchange part 1020, the top plate 1102 of the first heat exchange part 1010 is fixed to the first plate body 1200, and the second plate body 1300 is fixed to the bottom plate of the second heat exchange part 1020. The second heat exchange part 1020 includes a second flow channel and a third flow channel. The second flow channel includes a fifth channel 1021, the first inter-plate channel of the second heat exchange part 1020, and the sixth channel 1022. The first inlet 1001 is connected to the fifth channel 1021, and the sixth channel 1022 is connected to the cavity of the guide pipe 1740 or the second through hole 1820 of the connecting plate body; the third flow channel includes a seventh channel, the second inter-plate channel of the second heat exchange part 1020 and the eighth channel 1024. The seventh channel is connected to the first outlet 1002, and the first channel 1110 can be connected to the eighth channel 1024 through the first through hole 1810 of the connecting plate body 1800. When the thermal management device 1000 is working, the refrigerant enters the second flow channel from the first inlet 1001. The refrigerant in the second flow channel can exchange heat with the refrigerant in the third flow channel, and then enters the cavity of the guide pipe 1740 through the second through hole 1820. After being throttled by the throttling unit 1700, it enters the second channel 1120 and exchanges heat with the coolant, and then enters the eighth channel 1024 from the first channel 1110, and then is discharged from the thermal management device through the eighth channel 1024.

[0030] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A thermal management device, comprising a heat exchange core, a first plate, and a second plate, the heat exchange core comprising a plurality of stacked plates, wherein the plates of the heat exchange core are located between the first plate and the second plate along the stacking direction of the plates, the heat exchange core comprising a bottom plate and a top plate, the first plate being fixed to the top plate; the heat exchange core comprising a first channel, the first channel having an outlet on the bottom plate; the thermal management device comprising a pipe and a sensor unit, the pipe comprising a connecting wall, the connecting wall being fixed to the plates or the first plate; the pipe comprising a main body, the main body being located in the first channel, and a portion of the sensor unit being located in a cavity of the main body; The tube body includes a first port, which faces the first channel outlet and is close to the bottom plate along the axial direction of the tube body relative to the top plate; the sensing unit includes a temperature sensing part, which is located between the first channel outlet and the first port along the axial direction of the tube body, and / or the temperature sensing part is located in the cavity of the main body.

2. The thermal management device according to claim 1, characterized in that The heat exchange core includes a first partition plate, the first partition plate and the plate are integrally structured, the first partition plate is located in the first channel, the first channel includes a first cavity and a second cavity, the first cavity is located on one side of the first partition plate, the second cavity is located on the other side of the first partition plate, the first cavity is communicated with the first channel outlet, the second cavity is closer to the first plate body than the first cavity, the first partition plate has a first orifice, the first partition plate includes a first matching wall, the first matching wall includes a first orifice, the connecting wall includes a first connecting wall, the first matching wall is fixedly connected to the first connecting wall, and a seal is provided at the connection between the first matching wall and the first connecting wall; The temperature sensing portion is located in the first cavity; and / or at least partially located in the cavity of the tube body, and a gap is set between the temperature sensing portion and the inner wall of the tube body.

3. The thermal management device according to claim 1 or 2, characterized in that: The thermal management device includes a second partition, which is an integral structure with the top plate or the first plate body, the lower wall of the second partition faces the first channel, the second partition has a second opening, the second partition includes a second matching wall, the second matching wall includes a second opening, the connecting wall includes a second connecting wall, the second matching wall is fixedly connected to the second connecting wall, and a seal is set at the connection between the second matching wall and the second connecting wall.

4. The thermal management device according to claim 3, characterized in that: The second partition plate and the top plate are an integral structure, the first plate body has a accommodating hole, and part of the tube body is located in the accommodating hole; the tube body includes a limiting portion, the outer diameter of the limiting portion is larger than the outer diameter of the main body, at least part of the limiting portion is located on one side of the first plate body, and at least part of the main body is located on the other side of the plate body.

5. The thermal management device according to claim 4, characterized in that: The thermal management device includes a connecting base, the connecting base is fixed to the first plate or is an integral structure, the connecting base includes a first hole, the first hole has openings on the upper wall and the lower wall of the connecting base, and the opening formed by the first hole on the lower wall of the connecting base is arranged opposite to the receiving hole; At least a portion of the limiting portion is located in the first hole, and the connecting seat includes a first accommodating portion, and a wall of the first accommodating portion abuts against or is fixed to an outer wall of the limiting portion.

6. The thermal management device according to claim 4, characterized in that The connecting wall includes a third connecting wall, which is formed on the outer wall of the limiting portion. The first plate body includes a third matching wall, which is formed on the upper wall of the first plate body. The third matching wall is distributed circumferentially along the accommodating hole. The third matching wall is fixedly connected to the third connecting wall, and the connection between the third matching wall and the third connecting wall is sealed.

7. The thermal management device according to claim 5 or 6, characterized in that: The thermal management device includes a second accommodating portion, the sensing unit includes a connecting portion, the connecting portion is fixedly connected to the second accommodating portion, and the connection between the connecting portion and the second accommodating portion is sealed; The second accommodating portion is formed on the tube body, the connecting portion is located in the cavity of the tube body, the tube body includes a second opening, and along the axial direction of the tube body, the second accommodating portion is located between the limiting portion and the second opening; Alternatively, the second accommodating portion is formed on the connecting seat, the connecting portion is located in the first hole, the connecting portion is fixedly connected to the second accommodating portion, and the connection between the connecting portion and the second accommodating portion is sealed.

8. The thermal management device according to claim 7, characterized in that: The thermal management device includes a refrigerant flow channel and a coolant flow channel, the refrigerant flow channel includes a first flow channel, the first flow channel includes a second hole channel and the first hole channel, and the coolant flow channel includes a third hole channel and a fourth hole channel; The thermal management device includes a first inlet, a coolant outlet, and a coolant inlet. The first inlet is connected to the second channel; the coolant outlet is connected to the third channel, and the coolant inlet is connected to the fourth channel.

9. The thermal management device according to claim 8, characterized in that: The thermal management device further includes a throttling unit, the throttling unit including a valve core, a valve body and a valve port portion, the valve port portion having a valve port, and the valve core is capable of adjusting an opening of the valve port; The throttling unit also includes a guide tube, the lower wall of the valve body is fixed to the first plate body, the valve body has an opening facing the second channel, at least part of the guide tube is located in the second channel, the first end of the guide tube is relatively fixed to the valve port, the cavity of the guide tube is connected to the valve port, the valve port is connected to the second channel, and the second end of the guide tube has an opening.

10. The thermal management device according to claim 9, characterized in that: The heat exchange core includes a first heat exchange part, a second heat exchange part and a connecting plate body, the first flow channel and the coolant flow channel are located in the first heat exchange part, the upper wall of the connecting plate body is fixed to the bottom plate of the first heat exchange part, and the lower wall of the connecting plate body is fixed to the top plate of the second heat exchange part, the first heat exchange part is fixed to the first plate body, and the second plate body is fixed to the second heat exchange part; the second heat exchange part includes a first inlet, a first outlet, a second flow channel and a third flow channel, the second flow channel includes a fifth channel, a first inter-plate channel of the second heat exchange part, and a sixth channel, the first inlet is connected to the fifth channel, and the sixth channel is connected to the cavity of the guide pipe or to the second channel; the third flow channel includes a seventh channel, a second inter-plate channel of the second heat exchange part and an eighth channel, the seventh channel is connected to the first outlet, and the first channel can be connected to the eighth channel through the first through hole of the connecting plate body.

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