A vertical liquid cooler for temperature control of energy storage cabinet

Abstract

The invention relates to the technical field of liquid cooling machines, and specifically discloses a vertical liquid cooling machine for temperature control of an energy storage cabinet, comprising: a mounting plate 1, a mounting plate 2, a heat sink 1 and a heat sink 2, wherein a plurality of heat sinks 1 and 2 are provided, the heat sink 1 is fixed to one end of the mounting plate 1 by a fixing plate and bolts, the heat sink 2 is fixed to one end of the mounting plate 2 by a fixing plate and bolts, the mounting plate 1 and the mounting plate 2 are fixed together by bolts, the vertical liquid cooling machine is turned on, the coolant flows into the connection box through a liquid inlet pipe, and then flows into the heat sink 1 and the heat sink 2 respectively through a guide plate, so that the contact between the liquid medium and the heat exchange element is more sufficient, so as to quickly cool the liquid medium and improve the cooling effect of the liquid medium, and finally the liquid medium with cold capacity flows out from the liquid outlet end of the heat exchange base, and circulates to the load, so as to complete the cooling of the load.

Description

Technical Field

[0001] The invention relates to the technical field of liquid coolers, and in particular to a vertical liquid cooler for temperature control of an energy storage cabinet. Background Art

[0002] Energy storage systems are increasingly being used in new energy, smart grids, energy-saving technologies and other fields. Their main functions include upgrading and transforming traditional power grids, assisting in peak and frequency regulation, shaving peaks and filling valleys, and improving the grid-connected capacity of renewable energy. Energy storage systems are mostly in the form of energy storage containers, which are widely used due to their large battery capacity and high integration. Therefore, heat dissipation is required inside the energy storage cabinet.

[0003] With the development of heat dissipation technology, liquid cooling devices have emerged: liquid coolers. In the process of cooling liquid media by traditional liquid coolers, the flow channel structure of the traditional condenser is too simple, resulting in the liquid medium flowing too fast in the flow channel, and the contact with the heat exchanger is insufficient, so the liquid medium cannot be fully cooled. Therefore, the traditional method has a poor cooling effect on the liquid medium. Summary of the invention

[0004] The object of the present invention is to provide a vertical liquid cooler for temperature control of an energy storage cabinet to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vertical liquid cooler for temperature control of an energy storage cabinet, comprising: a mounting plate 1, a mounting plate 2, a heat sink 1 and a heat sink 2, a plurality of heat sinks 1 and 2 are provided, the heat sink 1 is fixed to one end of the mounting plate 1 by a fixing plate and bolts, the heat sink 2 is fixed to one end of the mounting plate 2 by a fixing plate and bolts, the mounting plate 1 and the mounting plate 2 are fixed together by bolts, the upper ends of the heat sink 1 and the heat sink 2 at the uppermost ends are fixedly installed with a connection box, the upper ends of the connection boxes are fixedly installed with a liquid inlet pipe, the upper end of the heat sink 1 is fixedly installed with a connection pipe, and the lower end is fixedly installed with a flow guide component;

[0006] The left and right ends of two adjacent heat sinks 2 in the vertical direction are connected by a connecting pipe, the upper end of the connecting pipe is fixedly mounted on the upper end of the side surface of the heat sink 2 located at the upper end, the lower end of the connecting pipe is fixedly mounted on the lower end of the side surface of the heat sink 2 located at the lower end, and the bottom end of the heat sink 2 at the bottom layer is fixedly mounted with a drain pipe;

[0007] The flow guide component includes a mounting tube, a threaded cover, an outer tube and a connecting hose. A threaded opening is provided at the upper end of the mounting tube, and the tube is threadedly connected to the inner wall of the threaded tube through the threaded opening. A driving block is fixedly installed on the outer wall of the upper end of the mounting tube, a sealing gasket is fixedly installed on the upper end of the driving block, and a threaded tube is fixedly installed on the lower end of the driving block. The inner diameter of the threaded tube is larger than the outer diameter of the mounting tube. A plurality of through holes are opened at the upper end of the mounting tube, and a plurality of strip holes are evenly opened at the lower end of the mounting tube.

[0008] Preferably, a notch two is provided at the center of the upper end of the mounting plate one, a notch one is provided at the center of the upper end of the mounting plate two, guide plates are fixedly installed on the inner ends of the notch two and the notch one, a liquid inlet one is provided at the upper end of the heat dissipation slot one located at the uppermost end, a liquid inlet two is provided at the upper end of the heat dissipation slot two located at the uppermost end, the notch two is connected to the liquid inlet one, the notch one is connected to the liquid inlet two, and the lower end of the connecting box is connected to the notch two, the liquid inlet one, and the notch one and the liquid inlet two.

[0009] Preferably, a connection port is provided at the bottom end of the heat dissipation groove one, a threaded barrel is fixedly installed on the outer wall of the bottom end of the heat dissipation groove one, the threaded barrel is connected to the connection port, and the lower end of the connecting tube is connected to the interior of the heat dissipation groove one.

[0010] Preferably, the threaded cover is threadedly connected to the lower end of the mounting tube, a plurality of leakage holes are evenly opened on the side wall of the bottom end of the threaded cover, a telescopic rod is fixedly installed on the inner wall of the bottom end of the threaded cover, a spring is installed in the telescopic rod, and a sealing block is fixedly installed on the upper end of the telescopic rod. When the threaded cover is threadedly connected to the lower end of the mounting tube, the sealing block is slidably inserted into the inner end of the mounting tube, and when the spring is in a balanced state, the sealing block is located between the through hole and the strip hole.

[0011] Preferably, an internal thread is provided on the inner side of the upper end of the outer tube, a sealing ring is fixedly installed on the upper end of the outer tube, and the outer tube is threadedly connected to the outer wall of the threaded tube through the internal thread.

[0012] Preferably, one end of the connecting hose is sleeved on the lower end of the outer tube, and the other end is sleeved on the upper end of the connecting tube.

[0013] Preferably, heat sink fin 1 is disposed on the outer wall of heat sink 1 and heat sink 2, and heat sink fin 2 is disposed at the rear end of heat sink 1 and heat sink 2.

[0014] Preferably, the left and right ends of the heat dissipation slot 2 located in the middle of the second mounting plate are connected to two connecting pipes, one for liquid inlet and one for liquid outlet, and the port of the connecting pipe for liquid inlet is lower than the port of the connecting pipe for liquid outlet.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The device is installed in a vertical liquid cooler. When the energy storage cabinet needs to be cooled, the vertical liquid cooler is turned on. The coolant flows into the connection box through the liquid inlet pipe, and then flows into the heat sink 1 and the heat sink 2 through the guide plate. When there is little coolant in the heat sink 1, the coolant can only flow down slowly through the through hole, or penetrate from the gap between the blocking block and the inner wall of the installation tube. As the coolant in the heat sink 1 increases, the pressure on the blocking block increases, and it will slowly press down through the compression spring. When the coolant in the heat sink 1 is about to be filled, the blocking block will be compressed between the strip holes, and the coolant will flow down quickly, thereby increasing the The coolant stays in the heat sink one for a period of time and slows down the flow rate of the coolant. The coolant flows into the heat sink two at the upper end, and the liquid level of the coolant gradually moves up in the heat sink two until it reaches one end of the connecting pipe, and then flows into the heat sink two at the lower end through the connecting pipe, and flows to the lower end in sequence. The coolant stays in the heat sink two for a period of time before flowing into the heat sink two at the lower end, so that the contact between the liquid medium and the heat exchange element is more complete, so as to quickly cool the liquid medium and improve the refrigeration effect of the liquid medium. Finally, the liquid medium with cold capacity flows out from the liquid outlet end of the heat exchange base, and circulates to the load to complete the cooling of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the overall structure of the present invention;

[0018] Figure 2 It is a rear view of the overall structure of the present invention;

[0019] Figure 3 It is a top view of the overall structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the connection between the mounting plate 1 and the heat sink 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the connection between the second mounting plate and the second heat sink of the present invention;

[0022] Figure 6 A schematic diagram of a connection of several heat sinks of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of a heat sink of the present invention;

[0024] Figure 8 This is a schematic diagram of the flow guide component of the present invention;

[0025] Fig. 9 It is a cross-sectional schematic diagram of the flow guide component of the present invention.

[0026] In the figure: 1. Mounting plate 1; 2. Heat sink 1; 3. Fixing plate; 4. Heat sink 1; 5. Heat sink 2; 6. Connecting pipe; 7. Connecting port; 8. Liquid inlet 1; 9. Threaded barrel; 10. Mounting pipe; 11. Threaded port; 12. Drive block; 13. Threaded pipe; 14. Through hole; 15. Strip hole; 16. Threaded cover; 17. Telescopic rod; 18. Blocking block; 19. Spring; 20. Outer pipe; 21. Connecting hose; 22. Mounting plate 2; 23. Heat sink 2; 24. Drain pipe; 25. Notch 1; 26. Liquid inlet 2; 27. Connecting pipe; 28. Notch 2; 30. Guide plate; 31. Connecting box; 32. Liquid inlet pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 9 The present invention provides a technical solution: a vertical liquid cooler for temperature control of an energy storage cabinet, comprising: a mounting plate 1, a mounting plate 22, a heat sink 2 and a heat sink 23, wherein the heat sink 2 and the heat sink 23 are both provided with a plurality of heat sinks, the heat sink 2 is fixed to one end of the mounting plate 1 through a fixing plate 3 and bolts, the heat sink 23 is fixed to one end of the mounting plate 22 through a fixing plate 3 and bolts, the mounting plate 1 and the mounting plate 22 are fixed together through bolts to form a liquid cooling heat sink, and the liquid cooling heat sink is used on a vertical liquid cooler, slowing down the flow rate of the coolant and fully contacting with the heat exchange component, To improve the heat dissipation effect of the vertical liquid cooler, the upper ends of the heat dissipation slot 1 2 and the heat dissipation slot 2 23 at the uppermost end are fixedly installed with a connection box 31, and the upper end of the connection box 31 is fixedly installed with a liquid inlet pipe 32, so that the coolant pipe in the cooling system of the vertical liquid cooler is connected to the liquid inlet pipe 32, so that the coolant enters the heat dissipation slot 1 2 and the heat dissipation slot 2 23. After the coolant flows through the heat dissipation slot 1 2 and the heat dissipation slot 2 23, it flows into the coolant pipe in the cooling system of the vertical liquid cooler through the outer pipe 20 and the drain pipe 24 respectively. The upper end of the heat dissipation slot 1 2 is fixedly installed with a connection pipe 6, and the lower end is fixedly installed with a guide component;

[0029] A notch 28 is provided at the center of the upper end of the mounting plate 1, a notch 25 is provided at the center of the upper end of the mounting plate 22, guide plates 30 are fixedly installed at the inner ends of the notch 28 and the notch 25, a liquid inlet 18 is provided at the upper end of the heat dissipation slot 2 located at the uppermost end, a liquid inlet 26 is provided at the upper end of the heat dissipation slot 2 located at the uppermost end, the notch 28 is connected to the liquid inlet 18, the notch 125 is connected to the liquid inlet 26, and the lower end of the connection box 31 is connected to the notch 28 and the liquid inlet 18 as well as the notch 125 and the liquid inlet 26, the lower ends of the two guide plates 30 are respectively inclined toward one side of the heat dissipation slot 1 and the heat dissipation slot 2, the coolant flows into the connection box 31 through the liquid inlet pipe 32, and then flows into the heat dissipation slot 1 and the heat dissipation slot 2 through the guide plate 30.

[0030] A connection port 7 is provided at the bottom end of the heat dissipation groove 2, and a threaded barrel 9 is fixedly installed on the outer wall of the bottom end of the heat dissipation groove 2. The threaded barrel 9 is connected to the connection port 7, and the lower end of the connecting pipe 6 is connected to the interior of the heat dissipation groove 2. The threaded barrel 9 increases the thickness at the connection port 7.

[0031] The flow guide component includes a mounting tube 10, a threaded cover 16, an outer tube 20 and a connecting hose 21. A threaded opening 11 is provided at the upper end of the mounting tube 10, and the threaded opening 11 is threadedly connected to the inner wall of the threaded barrel 9. A driving block 12 is fixedly installed on the outer wall of the upper end of the mounting tube 10. The driving block 12 is in an equilateral hexagonal shape. A sealing gasket is fixedly installed on the upper end of the driving block 12. The threaded opening 11 at the upper end of the mounting tube 10 and the inner wall of the threaded barrel 9 are threadedly connected by rotating the driving block 12. When the sealing gasket is in close contact with the lower end side wall of the threaded barrel 9, the upper end of the threaded opening 11 is flush with the upper end of the connecting port 7, so that the mounting tube 10 is connected to the inside of the heat dissipation slot 2.

[0032] A threaded tube 13 is fixedly installed at the lower end of the driving block 12, and the inner diameter of the threaded tube 13 is larger than the outer diameter of the mounting tube 10. A plurality of through holes 14 are provided at the upper end of the mounting tube 10, and a plurality of strip holes 15 are evenly provided at the lower end of the mounting tube 10. An external thread is provided at the lower end of the mounting tube 10, and a threaded cover 16 is threadedly connected to the lower end of the mounting tube 10. A plurality of leakage holes are evenly provided on the side wall of the bottom end of the threaded cover 16. A telescopic rod 17 is fixedly installed on the inner wall of the bottom end of the threaded cover 16, and a spring 19 is installed in the telescopic rod 17. A blocking block 18 is fixedly installed on the upper end of the telescopic rod 17. When the threaded cover 16 is threadedly connected to the lower end of the mounting tube 10, the blocking block 18 is slidably inserted into the inner end of the mounting tube 10. When the spring 19 is in a balanced state, the blocking block 18 is located between the through hole 14 and the strip hole 15. At this time, the coolant can only flow down slowly through the through hole 14, or penetrate a little from the gap between the blocking block 18 and the inner wall of the mounting tube 10. As the coolant in the heat sink 2 increases, the pressure applied to the blocking block 18 increases, and it will be slowly pressed down through the compression spring 19. When the coolant in the heat sink 2 is about to be full, the blocking block 18 will be compressed between the strip holes 15, and the coolant will flow down quickly, thereby increasing the time the coolant stays in the heat sink 2 and slowing down the flow rate of the coolant, so that the contact between the liquid medium and the heat exchange component is more complete, so as to quickly cool the liquid medium and improve the cooling effect of the liquid medium. Finally, the liquid medium with cold capacity flows out from the liquid outlet of the heat exchange base and circulates to the load to complete the cooling of the load.

[0033] Heat sink 1 4 is provided on the outer wall of heat sink 1 2 and heat sink 2 23, and heat sink 2 5 is provided at the rear end of heat sink 1 2 and heat sink 2 23, thereby increasing the contact area between the liquid medium and the heat exchange element, making the contact between the liquid medium and the heat exchange element more complete, achieving the goal of rapidly cooling the liquid medium and improving the cooling effect of the liquid medium.

[0034] An internal thread is provided on the inner side of the upper end of the outer tube 20, and a sealing ring is fixedly installed on the upper end of the outer tube 20. The outer tube 20 is threadedly connected to the outer wall of the threaded tube 13 through the internal thread. One end of the connecting hose 21 is sleeved on the lower end of the outer tube 20, and the other end is sleeved on the upper end of the connecting tube 6, so that the two adjacent heat dissipation grooves 2 are connected, and the outer tube 20 at the lower end of the lowest heat dissipation groove 2 is connected to the coolant pipe.

[0035] The left and right ends of two adjacent heat sinks 23 in the vertical direction are connected by a connecting pipe 27, the upper end of the connecting pipe 27 is fixedly mounted on the upper end of the side of the heat sink 23 at the upper end, and the lower end of the connecting pipe 27 is fixedly mounted on the lower end of the side of the heat sink 23 at the lower end. A drain pipe 24 is fixedly mounted on the bottom end of the heat sink 23 at the bottom layer, and the drain pipe 24 is connected to the coolant pipe. The left and right ends of the heat sink 23 located in the middle of the mounting plate 22 are connected to two connecting pipes 27, one for liquid inlet and one for liquid outlet, and the port of the connecting pipe 27 for liquid inlet is The coolant flows into the heat sink 23 at the upper end at the port of the connecting pipe 27 below the liquid outlet, and the liquid level of the coolant gradually moves up in the heat sink 23 until it reaches one end of the connecting pipe 27, and then flows into the heat sink 23 at the lower end through the connecting pipe 27, and flows to the lower end in sequence. The coolant stays in the heat sink 23 for a period of time before flowing into the heat sink 23 at the lower end, thereby increasing the contact time between the coolant and the heat sink 23, making the contact between the liquid medium and the heat exchange element more complete, thereby achieving the goal of quickly cooling the liquid medium and improving the refrigeration effect of the liquid medium.

[0036] In actual use, the device is installed in a vertical liquid cooler to replace the original condenser. When the energy storage cabinet needs to be cooled, the vertical liquid cooler is turned on, and the coolant flows into the connecting box 31 through the liquid inlet pipe 32, and then flows into the heat sink 2 and the heat sink 23 through the guide plate 30. When there is little coolant in the heat sink 2, the coolant can only flow down slowly through the through hole 14, or penetrate a little from the gap between the blocking block 18 and the inner wall of the mounting tube 10. As the coolant in the heat sink 2 increases, the pressure applied to the blocking block 18 increases, and it will be slowly pressed down through the compression spring 19. When the coolant in the heat sink 2 is about to be full, the blocking block 18 will be compressed between the strip holes 15, and the coolant will flow down quickly, thereby increasing the time the coolant stays in the heat sink 2, and Slow down the flow rate of the coolant, so that the contact between the liquid medium and the heat exchange element is more complete, so as to quickly cool the liquid medium and improve the cooling effect of the liquid medium. Finally, the liquid medium with cold capacity flows out from the liquid outlet end of the heat exchange base and circulates to the load to complete the cooling of the load; the coolant flows into the heat dissipation groove 23 at the upper end, and the liquid level of the coolant gradually moves up in the heat dissipation groove 23 until it reaches one end of the connecting pipe 27, and then flows into the heat dissipation groove 23 at the lower end through the connecting pipe 27, and flows to the lower end in turn. The coolant stays in the heat dissipation groove 23 for a period of time before flowing into the heat dissipation groove 23 at the lower end, increasing the contact time between the coolant and the heat dissipation groove 23, so that the contact between the liquid medium and the heat exchange element is more complete, so as to quickly cool the liquid medium and improve the cooling effect of the liquid medium.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vertical liquid cooler for temperature control of an energy storage cabinet, comprising: A mounting plate 1 (1), a mounting plate 2 (22), a heat sink 1 (2) and a heat sink 2 (23), wherein a plurality of heat sinks 1 (2) and heat sink 2 (23) are provided, wherein the heat sink 1 (2) is fixed to one end of the mounting plate 1 (1) by means of a fixing plate (3) and bolts, and the heat sink 2 (23) is fixed to one end of the mounting plate 2 (22) by means of a fixing plate (3) and bolts, and the mounting plate 1 (1) and the mounting plate 2 (22) are fixed together by means of bolts, characterized in that: a connection box (31) is fixedly installed at the upper end of the heat sink 1 (2) and the heat sink 2 (23) at the upper end, a liquid inlet pipe (32) is fixedly installed at the upper end of the connection box (31), a connection pipe (6) is fixedly installed at the upper end of the heat sink 1 (2), and a flow guide component is fixedly installed at the lower end; The left and right ends of two heat dissipation slots (23) adjacent to each other in the vertical direction are connected by a connecting pipe (27), the upper end of the connecting pipe (27) is fixedly mounted on the upper end of the side surface of the heat dissipation slot (23) located at the upper end, the lower end of the connecting pipe (27) is fixedly mounted on the lower end of the side surface of the heat dissipation slot (23) located at the lower end, and the bottom end of the heat dissipation slot (23) at the bottom layer is fixedly mounted with a drain pipe (24); The bottom end of the heat dissipation groove (2) is provided with a connection port (7), a threaded tube (9) is fixedly mounted on the outer wall of the bottom end of the heat dissipation groove (2), the threaded tube (9) is connected to the connection port (7), the lower end of the connecting pipe (6) is connected to the inside of the heat dissipation groove (2), a threaded cover (16) is threadedly connected to the lower end of the mounting tube (10), a plurality of leakage holes are evenly arranged on the side wall of the bottom end of the threaded cover (16), a telescopic rod (17) is fixedly mounted on the inner wall of the bottom end of the threaded cover (16), a spring (19) is installed in the telescopic rod (17), a blocking block (18) is fixedly mounted on the upper end of the telescopic rod (17), and the threaded cover (16) is provided with a spring (19). When the sealing block (18) is threadedly connected to the lower end of the mounting tube (10), the sealing block (18) is slidably inserted into the inner end of the mounting tube (10). When the spring (19) is in a balanced state, the sealing block (18) is located between the through hole (14) and the strip hole (15). The flow guide component comprises a mounting tube (10), a threaded cover (16), an outer tube (20) and a connecting hose (21). The upper end of the mounting tube (10) is provided with a threaded opening (11), and the threaded opening (11) and the inner wall of the threaded tube (9) are threadedly connected. A driving block (12) is fixedly installed on the outer wall of the upper end of the mounting tube (10). The upper end of the driving block (12) is fixedly connected to the inner wall of the threaded tube (9). A sealing gasket is installed, a threaded tube (13) is fixedly installed at the lower end of the driving block (12), the inner diameter of the threaded tube (13) is larger than the outer diameter of the mounting tube (10), a plurality of through holes (14) are opened at the upper end of the mounting tube (10), and a plurality of strip holes (15) are evenly opened at the lower end of the mounting tube (10).

2. A vertical liquid cooler for temperature control of an energy storage cabinet according to claim 1, characterized in that: A notch 2 (28) is provided at the center of the upper end of the mounting plate 1 (1), a notch 1 (25) is provided at the center of the upper end of the mounting plate 2 (22), a guide plate (30) is fixedly installed at the inner ends of the notch 2 (28) and the notch 1 (25), a liquid inlet 1 (8) is provided at the upper end of the heat dissipation slot 1 (2) at the uppermost end, a liquid inlet 2 (26) is provided at the upper end of the heat dissipation slot 2 (23) at the uppermost end, the notch 2 (28) is connected to the liquid inlet 1 (8), the notch 1 (25) is connected to the liquid inlet 2 (26), and the lower end of the connection box (31) is connected to the notch 2 (28), the liquid inlet 1 (8), and the notch 1 (25) and the liquid inlet 2 (26).

3. The vertical liquid cooler for temperature control of an energy storage cabinet according to claim 1, characterized in that: An internal thread is formed on the inner side of the upper end of the outer tube (20), a sealing ring is fixedly mounted on the upper end of the outer tube (20), and the outer tube (20) is threadedly connected to the outer wall of the threaded tube (13) via the internal thread.

4. A vertical liquid cooler for temperature control of an energy storage cabinet according to claim 3, characterized in that: One end of the connecting hose (21) is sleeved on the lower end of the outer tube (20), and the other end is sleeved on the upper end of the connecting tube (6).

5. The vertical liquid cooler for temperature control of an energy storage cabinet according to claim 1, characterized in that: The outer walls of the heat dissipation slot 1 (2) and the heat dissipation slot 2 (23) are both provided with heat dissipation fin 1 (4), and the rear ends of the heat dissipation slot 1 (2) and the heat dissipation slot 2 (23) are both provided with heat dissipation fin 2 (5).

6. A vertical liquid cooler for temperature control of an energy storage cabinet according to claim 1, characterized in that: The left and right ends of the heat dissipation slot 2 (23) located in the middle of the second mounting plate (22) are connected to two connecting pipes (27), one for liquid inlet and one for liquid outlet, and the port of the connecting pipe (27) for liquid inlet is lower than the port of the connecting pipe (27) for liquid outlet.

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