Pressure stabilizing device, closed liquid cooling circulation system and heating and ventilation equipment

Abstract

The invention relates to the technical field of heating and ventilation equipment, in particular to a pressure stabilizing device, a closed liquid cooling circulation system and heating and ventilation equipment. The pressure stabilizing device comprises an expansion tank, the expansion tank comprises a tank body and an expansion bag arranged in the tank body, a first cavity is defined in the expansion bag, and a second cavity is defined between the inner wall of the tank body and the outer wall of the expansion bag; the connecting pipe assembly is connected with the expansion tank, a fluid channel communicated with the first cavity is defined by the connecting pipe assembly, and the fluid channel is further used for being communicated with a main pipeline of the closed liquid cooling circulation system; the valve assembly is arranged on the connecting pipe assembly and can control connection and disconnection between the fluid channel and the main pipeline; the pressure release valve is arranged on the connecting pipe assembly and communicated with the portion, between the valve assembly and the first cavity, of the fluid channel. According to the pressure stabilizing device disclosed by the invention, the pressure release valve can be opened to discharge the liquid cooling medium in the first chamber under the condition that the closed liquid cooling circulation system normally runs, so that the detection and maintenance operation of the expansion tank is implemented.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation and air conditioning (HVAC) equipment technology, and in particular to a pressure stabilizing device, a closed-loop liquid cooling circulation system, and HVAC equipment. Background Technology

[0002] In closed-loop liquid cooling systems, such as energy storage liquid cooling thermal management systems and data center liquid cooling systems, pressure balancing devices are needed to prevent system pressure instability caused by changes in system liquid temperature leading to excessively high or low system pressure. A common solution is to add an expansion tank. When the system pressure is high, the volume of the expansion tank increases to absorb the pressure; when the pressure is low, the volume of the expansion tank decreases, thereby achieving the purpose of balancing the system pressure and avoiding frequent pressure changes or damage to some system components due to excessively high pressure.

[0003] The expansion tank itself is prone to failure and requires regular inspection and maintenance. However, when inspecting and maintaining the expansion tank, the liquid medium in the expansion tank needs to be drained. Since the expansion tank is connected to a closed liquid cooling circulation system, the closed liquid cooling circulation system also needs to be shut down and drained, which is a complicated operation. Summary of the Invention

[0004] The purpose of this invention is to at least solve the problem of the complexity of operating a closed-loop liquid cooling system that requires shutdown during the inspection and maintenance of expansion tanks. This purpose is achieved through the following means:

[0005] A first aspect of the present invention provides a pressure stabilizing device, comprising: an expansion tank, the expansion tank including a tank body and an air bladder disposed within the tank body, the interior of the air bladder defining a first chamber, and the inner wall of the tank body and the outer wall of the air bladder defining a second chamber, the second chamber being non-communicating with the first chamber; a connecting pipe assembly connected to the expansion tank, the connecting pipe assembly defining a fluid passage communicating with the first chamber, the fluid passage also being used to communicate with a main pipeline of a closed-loop liquid cooling circulation system; a valve assembly disposed on the connecting pipe assembly and used to control the opening and closing of the fluid passage and the main pipeline; and a pressure relief valve disposed on the connecting pipe assembly and partially communicating with the fluid passage between the valve assembly and the first chamber.

[0006] According to the pressure stabilizing device of the present invention, when inspecting or maintaining the expansion tank, the valve assembly can be used to control the disconnection between the fluid channel and the main pipeline, so that when the closed liquid cooling circulation system is operating normally, the pressure relief valve can be opened to discharge the liquid cooling medium in the first chamber, thereby carrying out the inspection and maintenance operation of the expansion tank.

[0007] In addition, the voltage stabilizing device according to the present invention may also have the following additional technical features:

[0008] In some embodiments of the present invention, the pipe assembly is provided with a first interface and a second interface communicating with the fluid channel, the first interface and the second interface being used to connect to two different locations with a pressure difference on the main pipeline, respectively.

[0009] In some embodiments of the present invention, the pipe assembly includes a first connector and a first pipe, the two ends of the first pipe are respectively provided with the first interface and the second interface, one end of the first connector is connected to the first chamber, and the other end of the first connector is connected to the first pipe.

[0010] In some embodiments of the present invention, the expansion tank is provided with an inlet and an outlet communicating with the first chamber; the connecting pipe assembly includes an inlet pipe and an outlet pipe, one end of the inlet pipe is connected to the inlet, the other end of the inlet pipe is provided with the first interface, one end of the outlet pipe is connected to the outlet, and the other end of the outlet pipe is provided with the second interface.

[0011] In some embodiments of the present invention, the pressure stabilizing device further includes a support tube disposed inside the air bladder, with both ends of the support tube connected to the inlet pipe and the outlet pipe, respectively. The wall of the support tube is provided with at least one through hole, which is used to connect the first chamber and the inner cavity of the support tube.

[0012] In some embodiments of the present invention, the valve assembly includes a first valve and a second valve, the first valve being disposed at the first interface and the first interface being connected to the main pipeline through the first valve, and the second valve being disposed at the second interface and the second interface being connected to the main pipeline through the second valve.

[0013] In some embodiments of the present invention, the pressure stabilizing device further includes a detection device installed in the tank, the detection device including a pressure detection unit communicating with the second chamber for detecting the gas pressure in the second chamber.

[0014] In some embodiments of the present invention, the pipe assembly includes a second connector and a second pipe, the valve assembly includes a third valve, the second connector is connected to one end of the second pipe and the first chamber respectively, the third valve is disposed on the second pipe and is used to control the connection and disconnection between the second pipe and the main pipeline, wherein the pressure relief valve is installed on the second connector and communicates with the first chamber through the second connector.

[0015] A second aspect of the present invention also provides a closed-loop liquid cooling circulation system, the closed-loop liquid cooling circulation system including a main pipeline and the pressure stabilizing device described in the first aspect, wherein the fluid channel in the pressure stabilizing device is connected to the main pipeline through a valve assembly.

[0016] In some embodiments of the present invention, the main pipeline is provided with a first installation port and a second installation port spaced apart along the flow direction of the liquid medium, and the connecting pipe assembly is provided with a first interface and a second interface communicating with the fluid channel. The first installation port is connected to the first interface, the second installation port is connected to the second interface, and there is a pressure difference between the first installation port and the second installation port.

[0017] In some embodiments of the present invention, the closed-loop liquid cooling circulation system includes at least one component disposed on the main pipeline, the at least one component being located between the first mounting port and the second mounting port and configured to create a pressure difference between the first mounting port and the second mounting port.

[0018] In some embodiments of the present invention, the pressure difference between the first mounting port and the second mounting port is A, and the total pressure difference of the closed liquid cooling cycle system is B, wherein the value of A / B is in the range of 0.05 to 0.1.

[0019] According to a third aspect of the invention, a heating, ventilation, and air conditioning (HVAC) device is also provided, comprising the closed-loop liquid cooling circulation system of the second aspect. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0021] Figure 1 This is a schematic diagram of the voltage stabilizing device and main pipeline according to Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the voltage stabilizing device and main pipeline according to Embodiment 3 of the present invention;

[0023] Figure 3 This is a partial cross-sectional structural diagram of the tank and detection device in Embodiments 1 and 3 of the present invention;

[0024] Figure 4 This is a partial cross-sectional structural diagram of the expansion tank in Embodiments 1 and 3 of the present invention;

[0025] Figure 5 This is a schematic diagram of the voltage stabilizing device and main pipeline according to Embodiment 2 of the present invention;

[0026] Figure 6 This is a partial cross-sectional structural diagram of the expansion tank according to Embodiment 2 of the present invention;

[0027] Figure 7 This is a partial cross-sectional structural diagram of the tank body according to Embodiment 2 of the present invention;

[0028] Figure 8 This is a cross-sectional structural diagram of the airbag in Embodiment 2 of the present invention.

[0029] The labels in the attached diagram are as follows:

[0030] 100. Voltage stabilizing device;

[0031] 10. Expansion tank; 11. Tank body; 111. First opening; 112. Second opening; 12. Airbag; 121. Airbag body; 122. First airbag sealing cover; 123. Second airbag sealing cover; 101. First chamber; 102. Second chamber; 103. Liquid inlet; 104. Liquid outlet; 13. First tank body flange; 14. Second tank body flange; 15. First flange; 151. Threaded joint; 16. Second flange; 17. Flange bolt;

[0032] 20. Connector assembly; 201. First interface; 202. Second interface; 21. First connector; 22. First connector; 23. Inlet pipe; 24. Outlet pipe; 25. Second connector; 26. Second connector;

[0033] 30. Valve assembly; 31. First valve; 32. Second valve; 33. Third valve;

[0034] 40. Pressure relief valve;

[0035] 50. Support tube; 51. Through hole;

[0036] 60. Detection device; 61. Detection valve protective cover;

[0037] 200. Closed-loop liquid cooling system; 210. Main pipeline; 2101. First mounting port; 2102. Second mounting port. Detailed Implementation

[0038] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0039] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0040] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0041] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure rotates, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0042] To address the issue of requiring a closed-loop liquid cooling system for waterproofing operations during the inspection and maintenance of expansion tanks, this invention proposes a pressure stabilizing device. By using this pressure stabilizing device, during the inspection or maintenance of the expansion tank, a valve assembly can be used to disconnect the fluid passage from the main pipeline. This allows the pressure relief valve to be opened to discharge the liquid cooling medium from the first chamber, assuming the closed-loop liquid cooling system is operating normally, thereby facilitating the inspection and maintenance of the expansion tank.

[0043] According to an embodiment of the present invention, a voltage stabilizing device 100 is provided. Please refer to... Figure 1 , Figure 2 and Figure 5 As shown, the pressure stabilizing device 100 includes an expansion tank 10, a connecting pipe assembly 20, a valve assembly 30, and a pressure relief valve 40. The expansion tank 10 includes a tank body 11 and an air bladder 12. The tank body 11 is made of metal, including but not limited to carbon steel. The air bladder 12 is a retractable and inflatable air bladder, and its material includes but is not limited to rubber.

[0044] Specifically, the first opening 111 of the tank body 11 is provided with a first tank flange 13 for assembling and disassembling the airbag 12. The airbag 12 includes a body 121 and a first airbag sealing cover 122. The edge of the first airbag sealing cover 122 is sealed and fitted to the opening edge of the body 121. Alternatively, the body 121 and the first airbag sealing cover 122 are integral structures. The airbag 12 is located inside the tank body 11 and is press-fitted into the first opening 111 of the tank body 11 by flange bolts 17 and a first flange 15. The interior of the airbag 12 defines a first chamber 101 for containing the liquid medium in the closed liquid cooling circulation system 200. A second chamber 102 is defined between the outer wall of the airbag 12 and the inner wall of the tank body 11. The second chamber 102 is filled with a gas (such as nitrogen) at a preset pressure and is used to apply pressure to the outer wall of the airbag 12. The second chamber 102 is not connected to the first chamber 101.

[0045] Understandably, when the pressure of the liquid medium in the first chamber 101 is greater than the pressure of the gas in the second chamber 102, the airbag 12 inflates; when the pressure of the liquid medium in the first chamber 101 is less than the pressure of the gas in the second chamber 102, the airbag 12 contracts; when the pressure of the liquid medium in the first chamber 101 is equal to the pressure of the gas in the second chamber 102, the airbag 12 maintains its current volume.

[0046] Furthermore, please combine Figure 1 , Figure 2 and Figure 4As shown, the connecting pipe assembly 20 is connected to the first flange 15 in the expansion tank 10. The connecting pipe assembly 20 defines a fluid passage that is connected to the first chamber 101. The fluid passage is also used to connect to the main pipeline 210 of the closed liquid cooling circulation system 200. The liquid medium in the closed liquid cooling circulation system 200 can flow into the first chamber 101 through the fluid passage. When the temperature of the liquid medium in the closed-loop liquid cooling system 200 is high, causing an increase in the total liquid medium and liquid pressure product, the liquid medium in the main pipeline 210 can flow into the first chamber 101 through the fluid channel. Since the first chamber 101 is connected to the main pipeline 210, the liquid pressure in the first chamber 101 increases with the increase in the pressure of the liquid medium in the main pipeline 210, causing the airbag 12 to expand and absorb the liquid pressure in the closed-loop liquid cooling system 200, thereby reducing the liquid pressure in the closed-loop liquid cooling system 200 and achieving the purpose of balancing the system pressure. This avoids frequent pressure changes in the closed-loop liquid cooling system 200 or excessive pressure that could damage some components in the closed-loop liquid cooling system 200.

[0047] Furthermore, the valve assembly 30 is located on the connecting pipe assembly 20 and can control the opening and closing of the fluid passage and the main pipe 210. A pressure relief valve 40 is also provided on the connecting pipe assembly 20 between the valve assembly 30 and the first chamber 101, and the pressure relief valve 40 is connected to the fluid passage. When inspecting or maintaining the expansion tank 10, the valve assembly 30 can be used to control the disconnection between the fluid passage and the main pipe 210, so that when the closed liquid cooling circulation system 200 is operating normally, the pressure relief valve 40 can be opened to discharge the liquid cooling medium in the first chamber 101, thereby carrying out the inspection and maintenance operation of the expansion tank 10.

[0048] In some embodiments, please combine Figure 2 and Figure 5 As shown, the connecting pipe assembly 20 is provided with a first interface 201 and a second interface 202 that communicate with the fluid channel. The first interface 201 and the second interface 202 are respectively used to connect different positions of the main pipeline 210, and there is a pressure difference between the first interface 201 and the second interface 202. During the operation of the closed liquid cooling circulation system 200, the liquid medium in the main pipeline 210 flows sequentially through the first interface 201 and the fluid channel to the first chamber 101 and then flows back to the main pipeline 210 through the second interface 202 via the fluid channel. This allows the liquid medium in the first chamber 101 of the expansion tank 10 to circulate, preventing the formation of a stagnant water area in the first chamber 101, which could lead to the growth of bacteria or rust, thereby affecting the overall water quality of the closed liquid cooling circulation system 200.

[0049] In this embodiment, the volume of the airbag 12 in its naturally deployed state is V1, and the maximum volume of the airbag 12 after being filled with liquid medium and expanded is V2, where V2 = 6V1. That is, the maximum volume of the airbag 12 is 6 times its volume in its naturally deployed state.

[0050] It should also be noted that the pre-charge pressure P of the gas in the first chamber 101 of the airbag 12 is related to the operating pressure of the closed liquid cooling circulation system 200, the internal volume of the expansion tank 10, the allowable liquid temperature range of the closed liquid cooling circulation system 200, and the total liquid volume, as shown in the following formula:

[0051]

[0052] Among them, the expansion tank 10 has the following parameters: volume (capacity to hold liquid) V, pre-charge pressure P, maximum allowable pressure P`, liquid density (kg / m3) ρ1 at the lowest temperature, density (kg / m3) ρ2 at the highest temperature, and total volume V1 of the system liquid at the lowest temperature.

[0053] The voltage stabilizing device 100 can take many forms. The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0054] Example 1

[0055] In this embodiment, please refer to Figure 1 , Figure 3 and Figure 4 As shown, the pressure stabilizing device 100 includes an expansion tank 10, a pipe assembly 20, a valve assembly 30, and a pressure relief valve 40.

[0056] The expansion tank 10 includes a tank body 11, an air bladder 12, a first tank body flange 13, flange bolts 17, and a first flange 15. Specifically, the tank body 11 has a first opening 111 at one end along its axial direction. The first tank body flange 13 is arranged around the first opening 111, and the inner ring edge of the first tank body flange 13 is sealed to the outer periphery of the first opening 111. The air bladder 12 includes a bladder body 121 and a first air bladder sealing cover 122. The edge of the first air bladder sealing cover 122 is sealed to the opening edge of the bladder body 121, or the bladder body 121 and the first air bladder sealing cover 122 are integral structures. The air bladder 12 is disposed inside the tank body 11, and is press-fitted into the first tank body flange 13 by the flange bolts 17 and the first flange 15, and the air bladder 12 seals the first opening 111 of the tank body 11. A first chamber 101 is defined inside the airbag 12. The first chamber 101 is used to contain the liquid medium in the closed liquid cooling circulation system 200. A second chamber 102 is defined between the outer wall of the airbag 12 and the inner wall of the tank 11. The second chamber 102 is filled with a gas (such as nitrogen) at a preset pressure. The gas in the second chamber 102 is used to apply pressure to the outer wall of the airbag 12.

[0057] The connecting pipe assembly 20 includes a first connector 21 and a first connecting pipe 22, which together define the aforementioned fluid channel. One end of the first connector 21 is connected to the first flange 15 and communicates with the first chamber 101, while the other end of the first connector 21 is connected to the first connecting pipe 22. The two ends of the first connecting pipe 22 are respectively provided with a first interface 201 and a second interface 202. The first interface 201 and the second interface 202 are respectively used to connect different positions of the main pipeline 210, and there is a pressure difference between the first interface 201 and the second interface 202. During the operation of the closed-loop liquid cooling circulation system 200, the liquid medium in the main pipeline 210 flows sequentially through the first interface 201 and the fluid channel to the first chamber 101 and then flows back to the main pipeline 210 through the second interface 202 via the fluid channel. This allows the liquid medium in the first chamber 101 of the expansion tank 10 to circulate, preventing the formation of a stagnant water area in the first chamber 101, which could lead to bacterial growth or rusting, thereby affecting the overall water quality of the closed-loop liquid cooling circulation system 200.

[0058] In this embodiment, the main pipeline 210 of the closed liquid cooling circulation system 200 is connected to the first chamber 101 of the expansion tank 10, and the pressures are equal. The second chamber 102 is pre-filled with gas at a pre-charge pressure P. When the liquid pressure in the closed liquid cooling circulation system 200 is lower than the pre-charge pressure P, the volume of the first chamber 101 is close to 0. During pre-charge, due to the influence of the pre-charge pressure P, the air bladder 12 is compressed and contracted, and the volume of the second chamber 102 is close to the overall volume of the inner liner of the tank body 11 of the expansion tank 10. Therefore, the volume of the first chamber 101 is close to 0. As the liquid pressure changes, if it exceeds the pre-charge pressure P of the second chamber 102, the liquid medium in the main pipeline 210 flows into the first chamber 101, causing the first chamber 101 to gradually increase until the pressure between the first chamber 101 and the second chamber 102 is balanced.

[0059] If the temperature of the liquid in the closed-loop liquid cooling circulation system 200 changes, the temperature rises, and the volume increases. If the main pipeline 210 and other components are non-expandable, and there is no expansion tank 10, the system pressure will increase with the temperature. Based on the principle of thermal expansion and contraction, this will lead to excessive liquid pressure, which may cause failure at the pressure-resistant weak points of the closed-loop liquid cooling circulation system 200. After adding the expansion tank 10, the air bladder 12 and the first chamber 101 can expand to absorb the volume change of the liquid medium in the main pipeline 210 caused by thermal expansion, maintain the pressure balance of the closed-loop liquid cooling circulation system 200, and improve the reliability of the closed-loop liquid cooling circulation system 200.

[0060] In this embodiment, the pressure relief valve 40 is located on the first connecting pipe 22 and communicates with the fluid passage. The valve assembly 30 includes a first valve 31 and a second valve 32. The first valve 31 is located at the first interface 201, and the first interface 201 is connected to the main pipeline 210 through the first valve 31. The second valve 32 is located at the second interface 202, and the second interface 202 is connected to the main pipeline 210 through the second valve 32.

[0061] When inspecting or maintaining the expansion tank 10, first close the first valve 31 and the second valve 32, so that the first port 201 and the second port 202 are disconnected from the main pipeline 210 respectively. If the closed liquid cooling circulation system 200 can operate normally, open the pressure relief valve 40 to discharge the liquid cooling medium in the first chamber 101. After the first chamber 101 of the expansion tank 10 is depressurized, the gas pressure inside the second chamber 102 can be detected, and the expansion tank 10 can be quickly inspected and maintained.

[0062] In this embodiment, the first valve 31 includes, but is not limited to, a ball valve, and the second valve 32 includes, but is not limited to, a ball valve.

[0063] Furthermore, a detection device 60 is also provided on the tank body 11. The detection device 60 includes a pressure detection unit communicating with the second chamber 102 for detecting the gas pressure inside the second chamber 102. It should be noted that in order to prevent the expansion tank 10 from failing, it is necessary to detect whether the pre-charge pressure inside the second chamber 102 is normal. To detect the pre-charge gas pressure in the second chamber 102 of the expansion tank 10, the liquid pressure in the first chamber 101 of the expansion tank 10 must be close to 0. The pressure stabilizing device 100 proposed in this invention can, without shutting down the closed liquid cooling circulation system 200, close the first valve 31 and the second valve 32, and then open the pressure relief valve 40 to discharge the liquid inside the first chamber 101 to achieve pressure relief. At this time, the detection device 60 can be used to test the pre-charge pressure of the gas in the second chamber 102. If there is a gas leak, the pre-charge pressure will decrease, and pressure needs to be added to ensure that the expansion tank 10 meets the usage requirements. The voltage stabilizing device 100 also includes a detection valve protection cover 61, which covers the detection device 60.

[0064] Example 2

[0065] In this embodiment, please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the pressure stabilizing device 100 includes an expansion tank 10, a pipe assembly 20, a valve assembly 30, and a pressure relief valve 40.

[0066] The expansion tank 10 includes a tank body 11, an air bladder 12, a first tank body flange 13, a second tank body flange 14, flange bolts 17, a first flange 15, and a second flange 16. Specifically, the tank body 11 has a first opening 111 and a second opening 112 at both ends along its axial direction. The first tank body flange 13 is arranged around the first opening 111, and the inner ring edge of the first tank body flange 13 is sealed and fitted to the outer periphery of the first opening 111. The second tank body flange 14 is arranged around the second opening 112, and the inner ring edge of the second tank body flange 14 is sealed and fitted to the outer periphery of the second opening 112. The airbag 12 includes a body 121 and a first airbag sealing cover 122 and a second airbag sealing cover 123 respectively located at both ends of the body 121 in the axial direction. The airbag 12 also has an inlet 103 and an outlet 104 at both ends in the circumferential direction. The edge of the first airbag sealing cover 122 is sealed and fitted to the edge of the inlet 103 of the body 121, and the edge of the second airbag sealing cover 123 is sealed and fitted to the edge of the outlet 104 of the body 121. The body 121, the first airbag sealing cover 122, and the second airbag sealing cover 123 are an integral structure. An airbag 12 is disposed inside the tank body 11, and a first airbag sealing cap 122 is press-fitted to the first tank body flange 13 by flange bolts 17 and a first flange 15, and the airbag 12 seals the first opening 111 of the tank body 11, while the first flange 15 seals the liquid inlet 103 of the airbag 12; a second airbag sealing cap 123 is press-fitted to the second tank body flange 14 by flange bolts 17 and a second flange 16, and the airbag 12 seals the second opening 112 of the tank body 11, while the second flange 16 seals the liquid outlet 104 of the airbag 12. A first chamber 101 is defined inside the airbag 12, which is used to contain the liquid medium in the closed liquid cooling circulation system 200. A second chamber 102 is defined between the outer wall of the airbag 12 and the inner wall of the tank body 11, and the second chamber 102 is filled with a gas (such as nitrogen) at a preset pressure, which is used to apply pressure to the outer wall of the airbag 12.

[0067] Furthermore, the connecting pipe assembly 20 includes an inlet pipe 23 and an outlet pipe 24, which together define a fluid channel. The fluid channel includes an inlet flow path of the inlet pipe 23 and an outlet flow path of the outlet pipe 24. One end of the inlet pipe 23 is connected to the inlet port 103, and the other end of the inlet pipe 23 is provided with a first interface 201. One end of the outlet pipe 24 is connected to the outlet port 104, and the other end of the outlet pipe 24 is provided with a second interface 202. The first interface 201 and the second interface 202 are respectively used to connect different positions of the main pipeline 210, and there is a pressure difference between the first interface 201 and the second interface 202. During the operation of the closed liquid cooling circulation system 200, the liquid medium in the main pipeline 210 flows sequentially through the first interface 201 and the fluid channel to the first chamber 101 and then flows back to the main pipeline 210 through the second interface 202 via the fluid channel. This allows the liquid medium in the first chamber 101 of the expansion tank 10 to circulate, preventing the formation of a stagnant water area in the first chamber 101, which could lead to the growth of bacteria or rust, thereby affecting the overall water quality of the closed liquid cooling circulation system 200.

[0068] In this embodiment, the pressure relief valve 40 is located on the first flange 15 and communicates with the fluid passage. The valve assembly 30 includes a first valve 31 and a second valve 32. The first valve 31 is located at the first interface 201, and the first interface 201 is connected to the main pipeline 210 through the first valve 31. The second valve 32 is located at the second interface 202, and the second interface 202 is connected to the main pipeline 210 through the second valve 32.

[0069] When inspecting or maintaining the expansion tank 10, first close the first valve 31 and the second valve 32, so that the first port 201 and the second port 202 are disconnected from the main pipeline 210 respectively. If the closed liquid cooling circulation system 200 can operate normally, open the pressure relief valve 40 to discharge the liquid cooling medium in the first chamber 101. After the first chamber 101 of the expansion tank 10 is depressurized, the gas pressure inside the second chamber 102 can be detected, and the expansion tank 10 can be quickly inspected and maintained.

[0070] In this embodiment, the first valve 31 includes, but is not limited to, a ball valve, and the second valve 32 includes, but is not limited to, a ball valve.

[0071] Furthermore, the pressure stabilizing device 100 also includes a support tube 50, which is disposed inside the airbag 12. The two ends of the support tube 50 are connected to the inlet tube 23 and the outlet tube 24, respectively. The tube wall of the support tube 50 is provided with at least one through hole 51, and the two ends of the through hole 51 are connected to the first chamber 101 and the inner cavity of the support tube 50, respectively. In this embodiment, a support tube 50 is provided inside the airbag 12, extending from the liquid inlet 103 to the liquid outlet 104. The support tube 50 has a through hole 51 in its wall, allowing the liquid inside and outside the tube to communicate. When the liquid pressure in the closed-loop liquid cooling circulation system 200 is lower than the pre-charge pressure in the first chamber 101, the outer wall of the airbag 12 is compressed by the pre-charge gas pressure and contracts to wrap around the outer wall of the support tube 50. This ensures that there is still a channel for the liquid medium to flow between the liquid inlet 103 and the liquid outlet 104, constructed by the inner cavity of the support tube 50. This allows the closed-loop liquid cooling circulation system 200 to operate regardless of whether the liquid pressure in the closed-loop liquid cooling circulation system 200 is lower or higher than the pre-charge gas pressure in the first chamber 101 of the expansion tank 10, thus realizing the circulation of the liquid medium inside the airbag 12 and the liquid medium in the main pipeline 210.

[0072] In this embodiment, the support tube 50 is provided with multiple through holes 51, so that the tube wall of the support tube 50 has a mesh-like structure. The liquid medium flowing into the support tube 50 from the liquid inlet pipe 23 can enter the first chamber 101 through the multiple through holes 51, or the liquid medium in the first chamber 101 can flow into the support tube 50 through the through holes 51 and flow back to the main pipeline 210 through the liquid outlet pipe 24, so as to realize the circulation of the liquid medium in the first chamber 101.

[0073] Imagine that without a flow pipe, if the liquid pressure in the closed-loop liquid cooling circulation system 200 is lower than the pre-charge pressure in the first chamber 101, the airbag 12 would be compressed and contracted by the pre-charged gas. The inner wall of the airbag 12 in the middle region would be squeezed together, blocking the passage between the inlet 103 and the outlet 104. This would prevent the liquid medium entering the first chamber 101 from the inlet 103 from flowing out of the outlet 104 to achieve circulation. In this embodiment, by setting the support pipe 50, the liquid inside the airbag 12 can circulate even when the pressure of the closed-loop liquid cooling circulation system 200 is lower or higher than the pre-charge gas pressure of the expansion tank 10. This further reduces the probability of stagnant water forming in the first chamber 101, leading to bacterial growth or rust.

[0074] Furthermore, a detection device 60 is also provided on the tank body 11. The detection device 60 includes a pressure detection unit communicating with the second chamber 102 for detecting the gas pressure inside the second chamber 102. It should be noted that in order to prevent the expansion tank 10 from failing, it is necessary to detect whether the pre-charge pressure inside the second chamber 102 is normal. To detect the pre-charge gas pressure in the second chamber 102 of the expansion tank 10, the liquid pressure in the first chamber 101 of the expansion tank 10 must be close to 0. The pressure stabilizing device 100 proposed in this invention can, without shutting down the closed liquid cooling circulation system 200, close the first valve 31 and the second valve 32, and then open the pressure relief valve 40 to discharge the liquid inside the first chamber 101 to achieve pressure relief. At this time, the detection device 60 can be used to test the pre-charge pressure of the gas in the second chamber 102. If there is a gas leak, the pre-charge pressure will decrease, and pressure needs to be added to ensure that the expansion tank 10 meets the usage requirements.

[0075] The voltage stabilizing device 100 also includes a detection valve protection cover 61, which covers the detection device 60.

[0076] Specifically, in this embodiment, the first flange 15 and the second flange 16 are respectively provided with threaded connectors 151. The inlet pipe 23 is connected to the threaded connector 151 of the first flange 15 through a connecting pipe connector, so that the inlet pipe 23 is connected to the inlet port 103. The outlet pipe 24 is connected to the threaded connector 151 of the second flange 16 through a connecting pipe connector, so that the outlet pipe 24 is connected to the outlet port 104. In other embodiments, the connecting pipe connector can also be connected to the first flange 15 in the form of quick-connect fitting, thread, chuck, etc.

[0077] Example 3

[0078] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 4 As shown, the pressure stabilizing device 100 includes an expansion tank 10, a pipe assembly 20, a valve assembly 30, and a pressure relief valve 40.

[0079] The expansion tank 10 includes a tank body 11 and an airbag 12. The tank body 11 has a first opening 111 at one end along its axial direction. A first tank body flange 13 is circumferentially disposed around the first opening 111, and the inner edge of the first tank body flange 13 is sealed against the outer periphery of the first opening 111. The airbag 12 includes a bladder body 121 and a first airbag sealing cover 122. The edge of the first airbag sealing cover 122 is sealed against the opening edge of the bladder body 121, or the bladder body 121 and the first airbag sealing cover 122 are an integral structure. The airbag 12 is disposed inside the tank body 11, and is press-fitted into the first tank body flange 13 by flange bolts 17 and a first flange 15, sealing the first opening 111 of the tank body 11. A first chamber 101 is defined inside the airbag 12. The first chamber 101 is used to contain the liquid medium in the closed liquid cooling circulation system 200. A second chamber 102 is defined between the outer wall of the airbag 12 and the inner wall of the tank 11. The second chamber 102 is filled with a gas (such as nitrogen) at a preset pressure. The gas in the second chamber 102 is used to apply pressure to the outer wall of the airbag 12.

[0080] The pipe assembly 20 includes a second connector 25 and a second pipe 26, and the valve assembly 30 includes a third valve 33. The second connector 25 and the second pipe 26 together define a fluid passage. One end of the second connector 25 is connected to the first flange 15 and communicates with the first chamber 101. The other end of the second connector 25 is connected to one end of the second pipe 26. The second connector 25 is also connected to a pressure relief valve 40. The third valve 33 is installed at the other end of the second pipe 26 and is also used to connect to the main pipeline 210.

[0081] In this embodiment, when the temperature of the liquid medium in the closed-loop liquid cooling circulation system 200 is high, resulting in an increase in the total liquid medium and the liquid pressure product, the liquid medium in the main pipeline 210 can flow into the first chamber 101 through the second connector 26 and the second joint 25. Since the first chamber 101 is connected to the main pipeline 210, the liquid pressure in the first chamber 101 increases as the pressure of the liquid medium in the main pipeline 210 increases, causing the airbag 12 to expand and absorb the liquid pressure in the closed-loop liquid cooling circulation system 200, thereby reducing the liquid pressure in the closed-loop liquid cooling circulation system 200 and achieving the purpose of balancing the system pressure. This avoids frequent pressure changes in the closed-loop liquid cooling circulation system 200 or excessive pressure causing damage to some components in the closed-loop liquid cooling circulation system 200.

[0082] Furthermore, the third valve 33 can control the connection and disconnection between the second connecting pipe 26 and the main pipe 210. When inspecting or maintaining the expansion tank 10, the third valve 33 can be controlled to disconnect the second connecting pipe 26 and the main pipe 210 so that, under the condition that the closed liquid cooling circulation system 200 can operate normally, the pressure relief valve 40 can be opened to discharge the liquid cooling medium in the first chamber 101, thereby carrying out the inspection and maintenance operation of the expansion tank 10.

[0083] According to a second aspect of the present invention, a closed-loop liquid cooling circulation system 200 is also provided. The closed-loop liquid cooling circulation system 200 includes a main pipeline 210 and a pressure stabilizing device 100, wherein a fluid passage in the pressure stabilizing device 100 is connected to the main pipeline 210. According to the closed-loop liquid cooling circulation system 200 proposed in the present invention, when inspecting or maintaining the expansion tank 10, the valve assembly 30 can be used to control the disconnection between the fluid passage and the main pipeline 210, so that, when the closed-loop liquid cooling circulation system 200 is operating normally, the pressure relief valve 40 can be opened to discharge the liquid cooling medium in the first chamber 101, thereby enabling the inspection and maintenance operation of the expansion tank 10.

[0084] Furthermore, the main pipeline 210 is provided with a first mounting port 2101 and a second mounting port 2102. The first mounting port 2101 and the second mounting port 2102 are spaced apart along the direction of liquid medium flow in the main pipeline 210, so that there is a pressure difference between the first mounting port 2101 and the second mounting port 2102. The first interface 201 of the pressure stabilizing device 100 is connected to the first mounting port 2101, and the second interface 202 of the pressure stabilizing device 100 is connected to the second mounting port 2102. When there is a pressure difference between the first mounting port 2101 and the second mounting port 2102, the liquid medium in the main pipeline 210 can flow into the first chamber 101 through the fluid channel from the first interface 201 and flow back into the main pipeline 210 from the second interface 202 and the second mounting port 2102. This facilitates the circulation of the liquid medium in the first chamber 101, preventing the formation of stagnant water areas in the first chamber 101, which could lead to bacterial growth or rust, and consequently affect the overall water quality of the closed-loop liquid cooling circulation system 200.

[0085] Furthermore, at least one component of the closed-loop liquid cooling circulation system 200 is located on the main pipeline 210 between the first mounting port 2101 and the second mounting port 2102. This at least one component includes, but is not limited to, a water pump, heat exchanger, pipeline valve, and water tank. The function of installing at least one component in the pipeline between the first mounting port 2101 and the second mounting port 2102 is to increase the pressure difference between the first mounting port 2101 and the second mounting port 2102, thereby increasing the circulation flow rate of the liquid medium in the first chamber 101 of the airbag 12. Specifically, the pressure difference between the first mounting port 2101 and the second mounting port 2102 is A, the total pressure difference of the closed-loop liquid cooling circulation system 200 is B, and the value of A / B is in the range of 0.05 to 0.1.

[0086] According to a third aspect of the present invention, a heating, ventilation, and air conditioning (HVAC) device is also provided, comprising the closed-loop liquid cooling circulation system of the second aspect. The HVAC device further includes a refrigerant circulation pipeline, a compressor, an evaporator, a condenser, and an electronic expansion valve, wherein the compressor, evaporator, electronic expansion valve, and condenser are connected in series in the refrigerant circulation pipeline. The main pipeline in the closed-loop liquid cooling circulation system is connected to the evaporator. The compressor performs work to continuously output cooling capacity to the main pipeline, and the liquid medium in the main pipeline acts as a cooling capacity transfer medium to transport the cooling capacity externally, thereby achieving cooling. The HVAC device proposed in this invention has the same technical effects as the closed-loop liquid cooling circulation system, which will not be elaborated further here.

[0087] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A voltage stabilizing device, characterized in that, The voltage stabilizing device includes: An expansion tank includes a tank body and an air bladder disposed within the tank body. The interior of the air bladder defines a first chamber, and the inner wall of the tank body and the outer wall of the air bladder define a second chamber. The second chamber and the first chamber are not in communication with each other. A connecting pipe assembly is connected to the expansion tank, the connecting pipe assembly defining a fluid passage communicating with the first chamber, the fluid passage also serving to communicate with the main pipeline of a closed liquid cooling circulation system; A valve assembly is disposed on the pipe assembly and is used to control the opening and closing of the fluid passage and the main pipeline; A pressure relief valve is provided on the connecting pipe assembly and communicates with the portion of the fluid passage located between the valve assembly and the first chamber.

2. The voltage stabilizing device according to claim 1, characterized in that, The connecting pipe assembly is provided with a first interface and a second interface communicating with the fluid channel. The first interface and the second interface are respectively used to connect to two different locations with pressure difference on the main pipeline.

3. The voltage stabilizing device according to claim 2, characterized in that, The connecting pipe assembly includes a first connector and a first connecting pipe. The first connecting pipe has a first interface and a second interface at its two ends, respectively. One end of the first connector is connected to the first chamber, and the other end of the first connector is connected to the first connecting pipe.

4. The voltage stabilizing device according to claim 2, characterized in that, The expansion tank is provided with an inlet and an outlet that communicate with the first chamber; The connector assembly includes an inlet pipe and an outlet pipe. One end of the inlet pipe is connected to the inlet port, and the other end of the inlet pipe is provided with the first interface. One end of the outlet pipe is connected to the outlet port, and the other end of the outlet pipe is provided with the second interface.

5. The voltage stabilizing device according to claim 4, characterized in that, The pressure stabilizing device also includes a support tube disposed inside the air bladder. The two ends of the support tube are respectively connected to the inlet pipe and the outlet pipe. The wall of the support tube is provided with at least one through hole, which is used to connect the first chamber and the inner cavity of the support tube.

6. The voltage stabilizing device according to any one of claims 2 to 5, characterized in that, The valve assembly includes a first valve and a second valve. The first valve is located at the first interface, and the first interface is connected to the main pipeline through the first valve. The second valve is located at the second interface, and the second interface is connected to the main pipeline through the second valve.

7. The voltage stabilizing device according to any one of claims 1 to 5, characterized in that, The pressure stabilizing device further includes a detection device installed in the tank. The detection device includes a pressure detection unit communicating with the second chamber for detecting the gas pressure inside the second chamber.

8. The voltage stabilizing device according to claim 1, characterized in that, The pipe assembly includes a second connector and a second pipe, and the valve assembly includes a third valve. The second connector is connected to one end of the second pipe and the first chamber, respectively. The third valve is located on the second pipe and is used to control the connection between the second pipe and the main pipeline. The pressure relief valve is installed on the second connector and communicates with the first chamber through the second connector.

9. A closed-loop liquid cooling system, characterized in that, The closed-loop liquid cooling system includes a main pipeline and a pressure stabilizing device as described in any one of claims 1 to 8, wherein the fluid passage in the pressure stabilizing device is connected to the main pipeline via a valve assembly.

10. The closed-loop liquid cooling system according to claim 9, characterized in that, The main pipeline is provided with a first installation port and a second installation port spaced apart along the flow direction of the liquid medium. The connecting pipe assembly is provided with a first interface and a second interface communicating with the fluid channel. The first installation port is connected to the first interface, and the second installation port is connected to the second interface. There is a pressure difference between the first installation port and the second installation port.

11. The closed-loop liquid cooling system according to claim 10, characterized in that, The closed-loop liquid cooling system includes at least one component disposed within the main pipeline, the at least one component being located between the first mounting port and the second mounting port and configured to create a pressure difference between the first mounting port and the second mounting port.

12. The closed-loop liquid cooling system according to claim 9 or 10, characterized in that, The pressure difference between the first mounting port and the second mounting port is A, and the total pressure difference of the closed liquid cooling cycle system is B, wherein the value of A / B is in the range of 0.05 to 0.

1.

13. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, The HVAC equipment includes a closed-loop liquid cooling system as described in any one of claims 9 to 12.

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