Automatic liquid and pressure regulating device and heat transfer containment system

Abstract

The application provides an automatic liquid regulating and pressure regulating device and a heat transfer closed system. The automatic liquid regulating and pressure regulating device comprises: a closed container serving as a buffer container for temporarily storing a working medium; a positive pressure valve connected between the closed container and the heat transfer closed system, the positive pressure valve being configured to open when the pressure in the heat transfer closed system is greater than the pressure in the closed container and the pressure difference is greater than an opening pressure threshold of the positive pressure valve, so that the working medium in the heat transfer closed system unidirectionally flows to the closed container; and a negative pressure valve connected between the closed container and the heat transfer closed system, the negative pressure valve being configured to open when the pressure in the closed container is greater than the pressure in the heat transfer closed system and the pressure difference is greater than an opening pressure threshold of the negative pressure valve, so that the working medium in the closed container unidirectionally flows to the heat transfer closed system.

Description

Technical Field

[0001] This application relates to an automatic liquid regulating and pressure regulating device and a heat transfer closed system. Background Technology

[0002] In closed heat transfer systems (such as solar thermal systems, heat pump systems, and engine cooling systems), the liquid working fluid expands or contracts in volume due to temperature changes during circulation. These volume changes directly cause pressure fluctuations in the closed heat transfer system and may be accompanied by a phase change (vaporization) of the working fluid, resulting in saturated vapor pressure.

[0003] In existing technologies, expansion tanks (including bladder or diaphragm types) are commonly used to absorb changes in liquid volume. However, conventional expansion tanks primarily buffer pressure through the compression of their internal gas chambers, essentially functioning as a pressure response mechanism. While conventional expansion tanks can balance the pressure within a closed heat transfer system, their own expansion and contraction interfere with the system pressure generated by temperature fluctuations, hindering heat transfer. Furthermore, when the liquid expansion pressure and saturated vapor pressure combine to create excessively high total pressure, the expansion tank alone may not be sufficient to suppress the pressure, necessitating a separate safety valve for pressure relief. However, opening the safety valve results in permanent loss of the working fluid, disrupting the overall balance of the working fluid in the system. Utility Model Content

[0004] This application aims to provide an automatic liquid and pressure regulating device that can automatically and bidirectionally adjust the working fluid volume and pressure of the heat transfer closed system according to the pressure changes of the heat transfer closed system, thereby stabilizing the working fluid volume and pressure of the heat transfer closed system.

[0005] This application provides an automatic liquid and pressure regulating device for a heat transfer closed system. The device includes: a sealed container serving as a buffer container for temporary storage of the working fluid; a positive pressure valve connected between the sealed container and the heat transfer closed system, configured to open when the pressure in the heat transfer closed system is greater than the pressure in the sealed container and the pressure difference is greater than the opening pressure threshold of the positive pressure valve, allowing the working fluid in the heat transfer closed system to flow unidirectionally from the heat transfer closed system to the sealed container; and a negative pressure valve connected between the sealed container and the heat transfer closed system, configured to open when the pressure in the sealed container is greater than the pressure in the heat transfer closed system and the pressure difference is greater than the opening pressure threshold of the negative pressure valve, allowing the working fluid in the sealed container to flow unidirectionally from the sealed container to the heat transfer closed system.

[0006] In at least one possible implementation, the positive pressure valve is a pressure regulating check valve, which is capable of adjusting the opening pressure threshold.

[0007] In at least one possible embodiment, the positive pressure valve includes a positive pressure valve passage, a positive pressure valve spring, an adjusting bolt, and a positive pressure valve locking element. The positive pressure valve passage includes a large-diameter section and a small-diameter section, the cross-sectional area of ​​the large-diameter section being larger than that of the small-diameter section. The positive pressure valve locking element and the positive pressure valve spring are disposed in the large-diameter section. The positive pressure valve spring causes the positive pressure valve locking element to press against the transition portion between the large-diameter section and the small-diameter section. The adjusting bolt is threadedly connected to the large-diameter section and presses against the positive pressure valve spring. The deformation of the positive pressure valve spring can be adjusted by rotating the adjusting bolt. The adjusting bolt is hollow.

[0008] In at least one possible implementation, the positive pressure valve further includes a locking nut, which is threadedly connected to the pressure adjusting bolt. The locking nut presses against the valve body of the positive pressure valve to lock the position of the pressure adjusting bolt.

[0009] In at least one possible implementation, the opening pressure threshold of the positive pressure valve is greater than the opening pressure threshold of the negative pressure valve.

[0010] In at least one possible implementation, the valve bodies of the positive pressure valve and the negative pressure valve are integrated.

[0011] In at least one possible implementation, the sealed container is sealed to the valve body of the positive pressure valve, the sealed container is sealed to the valve body of the negative pressure valve, and / or the heat transfer sealing system is sealed to the valve body of the positive pressure valve, and the heat transfer sealing system is sealed to the valve body of the negative pressure valve.

[0012] In at least one possible implementation, the sealed container is connected to a pre-compression device that maintains a preset pressure inside the sealed container.

[0013] In at least one possible implementation, the sealed container is a pressure vessel.

[0014] The embodiments of this application also propose a heat transfer closed system, including the automatic liquid adjustment and pressure regulation device and the heat transfer closed system described in any of the above technical solutions.

[0015] By adopting the above technical solution, when the pressure of the heat transfer closed system is too high, the positive pressure valve automatically opens to release the working fluid into the closed container, and when the heat transfer closed system needs to be replenished, the negative pressure valve automatically opens to replenish the working fluid in the closed container into the heat transfer closed system. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a heat transfer closed system according to an embodiment of this application is shown.

[0017] Explanation of reference numerals in the attached figures

[0018] 100 heat transfer closed system

[0019] 1. Positive pressure valve; 11. Positive pressure valve passage; 12. Positive pressure valve spring; 13. Adjusting bolt; 14. Positive pressure valve locking element; 15. Locking nut.

[0020] 2. Negative pressure valve 21. Negative pressure valve passage 22. Negative pressure valve spring 23. Locking bolt 24. Negative pressure valve locking element

[0021] 3. Sealed container

[0022] 4. Sealing joints 41. Sealing joints for heat transfer closed systems 42. Sealing joints for closed containers 43. Sealing rings Detailed Implementation

[0023] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0024] like Figure 1 As shown, the embodiments of this application propose a heat transfer closed system, which includes a heat transfer closed system 100 and an automatic liquid adjustment and pressure regulation device, which can be sealed to the heat transfer closed system 100.

[0025] The heat transfer closed system 100 can be a container, pipe, or connector used to contain a working fluid, which can be used for heat transfer, energy storage, etc. In this embodiment, the working fluid can be a liquid, such as water or a liquid heat transfer medium made of fluorine. The heat transfer closed system 100 can be a thermal system that requires stable working fluid volume and pressure, such as a solar water heater storage tank, a heat pump working fluid circulation loop, an electronic appliance heat transfer system, and a non-kinetic heat transfer system in a nuclear power plant.

[0026] The automatic liquid regulating and pressure regulating device may include a positive pressure valve 1, a negative pressure valve 2, and a sealed container 3 (buffer container). Both the positive pressure valve 1 and the negative pressure valve 2 are connected to the sealed container 3. The valve body of the positive pressure valve 1 and the sealed container 3 can be connected in a sealed manner, and the valve body of the negative pressure valve 2 and the sealed container 3 can also be connected in a sealed manner. The valve body of the positive pressure valve 1 and the heat transfer closed system 100 can also be connected in a sealed manner, and the valve body of the negative pressure valve 2 and the heat transfer closed system 100 can also be connected in a sealed manner.

[0027] In one possible implementation, the valve bodies of the positive pressure valve 1 and the negative pressure valve 2 are integrated. Sealing connectors 4 can be provided at both ends of the common valve body of the positive pressure valve 1 and the negative pressure valve 2. The sealing connectors 4 may include a heat transfer closed system sealing connector 41, a sealed container sealing connector 42, and a sealing ring 43.

[0028] The common valve body of the positive pressure valve 1 and the negative pressure valve 2 can be connected to the heat transfer closed system 100 through the heat transfer closed system sealing connector 41 (e.g., threaded). The common valve body of the positive pressure valve 1 and the negative pressure valve 2 can be connected to the sealed container 3 through the sealed container sealing connector 42 (e.g., threaded).

[0029] A sealing ring 43 may be provided between the sealed container 3 and the common valve body of the positive pressure valve 1 and the negative pressure valve 2. A sealing ring 43 may be provided between the heat transfer closed system 100 and the common valve body of the positive pressure valve 1 and the negative pressure valve 2.

[0030] A positive pressure valve 1 can be connected between a sealed container 3 and a heat transfer closed system 100. The positive pressure valve 1 is configured to allow the working fluid in the heat transfer closed system 100 to flow unidirectionally from the heat transfer closed system 100 to the sealed container 3. When the pressure in the heat transfer closed system 100 is greater than the pressure in the sealed container 3, and the pressure difference is greater than the opening pressure threshold of the positive pressure valve 1, the positive pressure valve 1 opens, allowing the working fluid in the heat transfer closed system 100 to flow unidirectionally from the heat transfer closed system 100 to the sealed container 3.

[0031] A negative pressure valve 2 can be connected between a sealed container 3 and a heat transfer closed system 100. The negative pressure valve 2 is configured to allow the working fluid in the sealed container 3 to flow unidirectionally from the sealed container 3 to the heat transfer closed system 100. When the pressure in the sealed container 3 is greater than the pressure in the heat transfer closed system 100, and the pressure difference is greater than the opening pressure threshold of the negative pressure valve 2, the negative pressure valve 2 opens, allowing the working fluid in the sealed container 3 to flow unidirectionally from the sealed container 3 to the heat transfer closed system 100.

[0032] Positive pressure valve 1 can be a pressure regulating check valve, and positive pressure valve 1 can adjust the opening pressure threshold.

[0033] The positive pressure valve 1 may include a positive pressure valve body, a positive pressure valve spring 12, a pressure adjusting bolt 13, and a positive pressure valve locking element (positive pressure valve core) 14. The positive pressure valve body may be provided with a positive pressure valve passage 11. The positive pressure valve passage 11 may connect the heat transfer closed system 100 and the sealed container 3. The positive pressure valve passage 11 may include a large-diameter section and a small-diameter section, the cross-sectional area of ​​the large-diameter section being larger than that of the small-diameter section, and the large-diameter section and the small-diameter section may be transitioned by a conical surface. The pressure adjusting bolt 13 is threadedly connected to the large-diameter section, and the pressure adjusting bolt 13 may be hollow. The positive pressure valve locking element 14 and the positive pressure valve spring 12 may be provided in the large-diameter section, with one end of the positive pressure valve spring 12 ( Figure 1The upper end of the positive pressure valve spring 12 presses against the adjusting bolt 13, and the other end of the positive pressure valve spring 12 ( Figure 1 The lower end of the spring 12 presses against the locking element 14 of the positive pressure valve. The positive pressure valve spring 12 causes the locking element 14 of the positive pressure valve to press against the transition part between the large diameter section and the small diameter section. The deformation of the positive pressure valve spring 12 can be adjusted by rotating the adjusting bolt 13 to adjust the screw-in depth, thereby adjusting the opening pressure threshold of the positive pressure valve 1 (e.g., the maximum working pressure corresponding to the heat transfer closed system 100).

[0034] The positive pressure valve 1 also includes a locking nut 15, which is threadedly connected to the pressure adjusting bolt 13. The locking nut 15 can press against the valve body of the positive pressure valve 1 to lock the position of the pressure adjusting bolt 13. Thus, after adjusting the deformation of the positive pressure valve spring 12 by the pressure adjusting bolt 13, the deformation of the positive pressure valve spring 12 can be maintained.

[0035] When the pressure in the heat transfer closed system 100 can overcome the elastic force of the positive pressure valve spring 12, the positive pressure valve spring 12 is compressed, the positive pressure valve locking element 14 leaves the transition part between the large diameter section and the small diameter section, and the positive pressure valve 1 opens.

[0036] The negative pressure valve 2 may include a negative pressure valve body, a negative pressure valve spring 22, a locking bolt 23, and a negative pressure valve locking element (negative pressure valve core) 24. The negative pressure valve body may be provided with a negative pressure valve passage 21. The negative pressure valve passage 21 may connect the heat transfer closed system 100 and the sealed container 3. The negative pressure valve passage 21 may include a large-diameter section and a small-diameter section, the cross-sectional area of ​​the large-diameter section being larger than that of the small-diameter section, and the large-diameter section and the small-diameter section may be transitioned by a conical surface. The locking bolt 23 is threadedly connected to the large-diameter section, and the locking bolt 23 may be hollow. The negative pressure valve spring 22 and the negative pressure valve locking element 24 may be provided in the large-diameter section, with one end of the negative pressure valve spring 22 (… Figure 1 The upper end of the negative pressure valve spring 22 presses against the locking element 24 of the negative pressure valve, while the other end of the spring 22 of the negative pressure valve ( Figure 1 The lower end of the valve is pressed against the locking bolt 23. The negative pressure valve spring 22 can press the negative pressure valve locking element 24 against the transition part between the large diameter section and the small diameter section.

[0037] When the pressure in the sealed container 3 can overcome the elastic force of the negative pressure valve spring 22, the negative pressure valve spring 22 is compressed, the negative pressure valve locking element 24 leaves the transition part between the large diameter section and the small diameter section, and the negative pressure valve 2 opens.

[0038] It is understandable that the compression of the negative pressure valve spring 22 can be finely adjusted by rotating the locking bolt 23 to adjust the screw-in depth.

[0039] Understandable. Figure 1 The adjusting bolt 13 and locking bolt 23 shown in the diagram each have bolt heads; however, this application is not limited thereto. Furthermore, Figure 1The pressure adjusting bolt 13 and locking bolt 23 shown are located at the maximum positions of the positive pressure valve channel 11 and the negative pressure valve channel 21, respectively. That is, the compression of the positive pressure valve spring 12 and the negative pressure valve spring 22 has reached its maximum. The compression of the positive pressure valve spring 12 and the negative pressure valve spring 22 can be reduced by unscrewing the pressure adjusting bolt 13 and the locking bolt 23 from the positive pressure valve channel 11 and the negative pressure valve channel 21, respectively.

[0040] The sealed container 3 can be connected to a pre-pressurization device, which can maintain a preset pressure inside the sealed container 3. When the pressure inside the heat transfer closed system 100 decreases, the negative pressure valve 2 can be opened under the pressure of the pressure device, so that the working fluid in the sealed container 3 flows to the heat transfer closed system 100.

[0041] In one possible implementation, the sealed container 3 can be a pressure vessel, such as a metal pressure vessel, which is equivalent to having a built-in pre-pressurization device that can maintain a reference pressure higher than atmospheric pressure inside.

[0042] The opening pressure threshold of positive pressure valve 1 can be greater than the opening pressure threshold of negative pressure valve 2. For example, the opening pressure threshold of negative pressure valve 2 can correspond to the minimum pressure required for the heat transfer closed system 100 to maintain normal operation.

[0043] Under stable operating conditions, the pressure in the heat transfer closed system 100 is greater than the pressure in the sealed container 3.

[0044] Reference Figure 1 Explain the working process of the automatic liquid leveling and pressure regulating device. Figure 1 The unidirectional arrows in the diagram indicate the flow direction of the working fluid.

[0045] When the temperature of the working fluid in the heat transfer closed system 100 increases, the volume of the liquid working fluid expands, and some of the working fluid may vaporize to generate saturated vapor pressure. This increases the total pressure within the heat transfer closed system 100 (the sum of the liquid working fluid expansion pressure and the saturated vapor pressure). This causes the pressure difference between the heat transfer closed system 100 and the sealed container 3 to exceed the opening pressure threshold of the positive pressure valve 1. At this point, the positive pressure valve 1 opens, allowing excess working fluid (including possible gas-liquid mixtures) to be discharged from the heat transfer closed system 100 into the sealed container 3. This maintains the total amount and pressure of the working fluid within the heat transfer closed system 100 within a preset range, and keeps the effective circulating working fluid volume within the heat transfer closed system at a reasonable upper limit, ensuring stable operating conditions for the heat transfer closed system 100 and guaranteeing its safety.

[0046] When the temperature of the working fluid in the heat transfer closed system 100 decreases, the volume of the liquid working fluid shrinks, the pressure inside the heat transfer closed system 100 decreases, and the total amount of working fluid in the heat transfer closed system 100 is insufficient. This causes the pressure difference between the sealed container 3 and the heat transfer closed system 100 to exceed the opening pressure threshold of the negative pressure valve 2. At this time, the working fluid in the sealed container 3 flows back to the heat transfer closed system 100, so that the liquid volume and pressure of the heat transfer closed system 100 are maintained at the working state required by the heat transfer closed system 100. This ensures that the heat transfer closed system 100 obtains stable operating conditions and guarantees the safety of the heat transfer closed system, avoiding the decrease in heat transfer efficiency caused by the reduction of liquid working fluid.

[0047] The automatic liquid regulating and pressure regulating device and heat transfer closed system of this application can achieve the following beneficial effects.

[0048] 1. The positive and negative pressure valves of this application can automatically open and close, which not only effectively stabilizes the operating pressure of the heat transfer closed system 100, but more importantly, through the bidirectional automatic transfer of the liquid working fluid between the heat transfer closed system 100 and the buffer container, precisely maintains the stability of the total amount (liquid volume) of the circulating working fluid within the heat transfer closed system 100. This is crucial for heat transfer systems that rely on specific liquid volumes and pressures to ensure heat transfer efficiency.

[0049] 2. The heat transfer closed system of this application can simultaneously respond to the liquid expansion pressure generated by the thermal expansion and contraction of the liquid and the saturated vapor pressure generated by the vaporization of the working fluid. When the total pressure exceeds the set value, it will release; when the pressure is too low, it will replenish. This solves the problems of overpressure protection and liquid replenishment, and avoids the problem of permanent loss of working fluid caused by conventional safety valve release.

[0050] 3. The entire adjustment process is fully automatic, requiring no external intervention or power supply, achieving self-balancing of liquid volume and pressure in the heat transfer closed system 100, thus improving the system's reliability and service life.

[0051] 4. The automatic liquid regulating and pressure regulating device of this application adopts an integrated valve body design, which is compact in structure and stable in performance. The opening pressure threshold of the positive pressure valve 1 can be adjusted, and the parameters can be easily set according to different specific needs.

[0052] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0053] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0054] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0056] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. An automatic liquid adjustment and pressure regulation device, wherein the automatic liquid adjustment and pressure regulation device is used in a closed heat transfer system, characterized in that, include: A closed container that serves as a buffer for temporary storage of the working medium; A positive pressure valve is connected between the sealed container and the heat transfer closed system. The positive pressure valve is configured to open when the pressure in the heat transfer closed system is greater than the pressure in the sealed container and the pressure difference is greater than the opening pressure threshold of the positive pressure valve, so that the working fluid in the heat transfer closed system flows unidirectionally from the heat transfer closed system to the sealed container. as well as A negative pressure valve is connected between the sealed container and the heat transfer closed system. The negative pressure valve is configured to open when the pressure in the sealed container is greater than the pressure in the heat transfer closed system and the pressure difference is greater than the opening pressure threshold of the negative pressure valve, so that the working fluid in the sealed container flows unidirectionally from the sealed container to the heat transfer closed system.

2. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The positive pressure valve is a pressure-regulating one-way valve, and the positive pressure valve can adjust the opening pressure threshold.

3. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The positive pressure valve includes a positive pressure valve passage, a positive pressure valve spring, a pressure adjusting bolt, and a positive pressure valve locking element. The positive pressure valve channel includes a large-diameter section and a small-diameter section. The cross-sectional area of ​​the large-diameter section is larger than that of the small-diameter section. The positive pressure valve locking element and the positive pressure valve spring are disposed in the large-diameter section. The positive pressure valve spring causes the positive pressure valve locking element to press against the transition part between the large-diameter section and the small-diameter section. The pressure adjusting bolt is threadedly connected to the large-diameter section. The pressure adjusting bolt presses against the positive pressure valve spring. The deformation of the positive pressure valve spring can be adjusted by rotating the pressure adjusting bolt. The pressure adjusting bolt is hollow.

4. The automatic liquid adjustment and pressure regulating device according to claim 3, characterized in that, The positive pressure valve also includes a locking nut, which is threadedly connected to the pressure adjusting bolt. The locking nut presses against the valve body of the positive pressure valve, thereby locking the position of the pressure adjusting bolt.

5. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The opening pressure threshold of the positive pressure valve is greater than the opening pressure threshold of the negative pressure valve.

6. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The valve bodies of the positive pressure valve and the negative pressure valve are integrated.

7. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The sealed container is sealed to the valve body of the positive pressure valve, and the sealed container is sealed to the valve body of the negative pressure valve, and / or The heat transfer sealing system is sealed to the valve body of the positive pressure valve, and the heat transfer sealing system is sealed to the valve body of the negative pressure valve.

8. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The sealed container is connected to a pre-compression device, which maintains a preset pressure inside the sealed container.

9. The automatic liquid adjustment and pressure regulating device according to claim 1, characterized in that, The sealed container is a pressure vessel.

10. A closed-loop heat transfer system, characterized in that, It includes the automatic liquid regulating and pressure regulating device and the heat transfer closed system as described in any one of claims 1 to 9.

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