Pump driven two-phase fluid circuit system

Abstract

The embodiment of the present application relates to the technical field of heat control, and discloses a pump-driven two-phase fluid loop system, which comprises a circulating pump, an evaporator, a condenser, a liquid accumulator heat exchanger and a liquid accumulator. The inlet of the evaporator is connected to the outlet of the circulating pump through a pipeline, and the evaporator is attached to the surface of a heat generating device. The inlet of the condenser is connected to the outlet of the evaporator through a pipeline. The inlet of the liquid accumulator heat exchanger is connected to the outlet of the condenser, and the liquid accumulator heat exchanger is attached to the surface of the liquid accumulator. The liquid inlet of the liquid accumulator is connected to the outlet of the liquid accumulator heat exchanger through a pipeline, and the liquid outlet of the liquid accumulator is connected to the liquid inlet of the circulating pump through a pipeline. The liquid accumulator comprises a first cavity, a second cavity and an elastic diaphragm. The elastic diaphragm is located between the first cavity and the second cavity. The first cavity is in communication with the liquid inlet of the circulating pump. The volume of the second cavity is increased or decreased to adjust the pressure in the loop system. In the above manner, the embodiment of the present application can adaptively adjust the pressure in the loop system.

Description

Technical Field

[0001] This invention relates to the field of thermal control technology, and in particular to a pump-driven two-phase fluid circuit system. Background Technology

[0002] A pump-driven two-phase fluid loop system is a thermal control system that utilizes the heat absorption during evaporation and the heat release during condensation of a working fluid during its circulation process for heat collection and transport. Driven by a circulating pump, the working fluid flows into the evaporator. Upon entering the evaporator, the working fluid absorbs heat and changes from a single phase to a gas-liquid two-phase state. After passing through the condenser, the two-phase fluid releases heat and changes from a gas-liquid two-phase state to a liquid state before re-entering the circulating pump, forming the entire cycle of heat absorption, transport, and release.

[0003] With the increasing demand for high-power, large spacecraft and special payload equipment, the aforementioned thermal control systems are typically used for heat dissipation to keep heat-generating equipment within a preset temperature range. Existing pump-driven two-phase fluid loop systems usually also include a liquid receiver, which serves as the control unit for the operating temperature in the thermal control system. When the liquid receiver's temperature is constant, as the heat load starts, its temperature continuously rises, increasing the heat transferred to the two-phase loop and thus increasing the condenser's heat dissipation load. Given a constant condenser specification, a higher liquid receiver temperature needs to be set to ensure the loop's cooling capacity.

[0004] The inventors of this invention discovered that when the heat generation equipment reduces or shuts down, the heat absorbed by the evaporator decreases, and the liquid phase heat exchange area of ​​the evaporator in the system loop increases. This easily leads to a large temperature gradient (the temperature when the heat generation equipment is turned on and off), which can cause the heat generation equipment to be in an environment exceeding the required temperature gradient range, affecting its performance. To reduce the temperature gradient, existing technologies can adjust the temperature control temperature of the liquid receiver based on the heat generation equipment's output to reduce the liquid phase area of ​​the evaporator. However, when the heat generation equipment's output changes rapidly, due to the large heat capacity of the liquid receiver, it is difficult to actively change the temperature control temperature of the liquid receiver through heating or cooling. Summary of the Invention

[0005] In view of the above problems, embodiments of the present invention provide a pump-driven two-phase fluid loop system, which overcomes the problem that when the heat load decreases or is turned off, the heat absorbed by the evaporator from the heat-generating equipment decreases, the heat exchange area of ​​the evaporator liquid phase increases, resulting in a large temperature gradient in the system loop (temperature when the heat load is turned on and off), which easily causes the heat-generating equipment to be outside the required temperature gradient range, affecting the performance of the heat-generating equipment.

[0006] According to one aspect of the present invention, a pump-driven two-phase fluid loop system is provided, comprising a circulating pump for driving fluid to flow in a pipeline; an evaporator, the inlet of which is connected to the outlet of the circulating pump via a pipeline, the evaporator being attached to the surface of a heat-generating device, the evaporator being used to heat at least partially the fluid to form steam; a condenser, the inlet of which is connected to the outlet of the evaporator via a pipeline, the condenser being used to cool the steam to a subcooled fluid; a heat exchanger, the inlet of which is connected to the outlet of the condenser via a pipeline; and a reservoir, the reservoir being connected to the outlet of the heat exchanger and the inlet of the circulating pump via a pipeline, the reservoir comprising a first cavity, a second cavity, and an elastic diaphragm, the elastic diaphragm separating the first cavity and the second cavity, the elastic diaphragm being located between the first cavity and the second cavity, the first cavity being connected to the inlet of the circulating pump, the second cavity being a closed cavity, the volume of the second cavity increasing or decreasing when the pressure in the second cavity is greater than or less than the pressure in the first cavity to regulate the pressure in the loop system.

[0007] In one alternative approach, when the pressure in the second cavity is greater than the pressure in the first cavity, the working fluid in the second cavity pushes the elastic diaphragm to bend toward the first cavity, reducing the volume of the first cavity and increasing the pressure in the loop system. When the pressure in the second cavity is less than the pressure in the first cavity, the working fluid in the first cavity pushes the elastic diaphragm to bend toward the second cavity, increasing the volume of the first cavity and decreasing the pressure in the loop system.

[0008] In one alternative embodiment, the second cavity is a closed cavity filled with a second working fluid. The second working fluid exchanges heat with the working fluid at the outlet of the condenser through the inner wall of the reservoir and the heat exchanger. When the temperature of the working fluid at the outlet of the condenser is greater than or less than the temperature of the second working fluid in the second cavity, the second working fluid absorbs or releases heat, and the second cavity expands or contracts.

[0009] In one alternative embodiment, the heat exchanger is attached to the outer surface of the reservoir, the heat exchanger is disposed near the second cavity of the reservoir, and the outlet of the heat exchanger is in communication with the first cavity.

[0010] In one alternative approach, when the working fluid temperature at the outlet of the condenser increases, the volume of the second cavity increases, the volume of the first cavity decreases, and the pressure in the loop system increases; conversely, when the working fluid temperature at the outlet of the condenser decreases, the volume of the second cavity decreases, the volume of the first cavity increases, and the pressure in the loop system decreases.

[0011] In an alternative embodiment, the reservoir further includes a temperature controller disposed on the side of the outer casing near the second cavity. The temperature controller is used to control the temperature within the second cavity. The temperature controller is used to heat or cool the temperature within the second cavity to improve the response speed of the reservoir's temperature control.

[0012] In one alternative embodiment, a first working fluid is disposed in the first cavity, and a second working fluid is disposed in the second cavity. The saturation pressure of the first working fluid and the pressure of the second working fluid both vary with the temperature of the reservoir, and at the same temperature, the pressure of the second working fluid is greater than the saturation pressure of the first working fluid.

[0013] In one alternative, the first working medium is R134a and the second working medium is R22.

[0014] In one alternative embodiment, the reservoir satisfies at least one of the following conditions: the working fluid in the first cavity is a single working fluid or a mixture of working fluids; the working fluid in the second cavity is a single working fluid or a mixture of working fluids.

[0015] The beneficial effects of this invention embodiment are as follows: Unlike existing technologies, this invention embodiment includes a circulating pump, an evaporator, a condenser, and a liquid receiver. The circulating pump drives fluid to flow in a pipeline. The inlet of the evaporator is connected to the outlet of the circulating pump via a pipeline. The evaporator is attached to the surface of the heat-generating equipment and is used to heat at least part of the fluid to form steam. The inlet of the condenser is connected to the outlet of the evaporator via a pipeline. The condenser is used to cool the steam to subcooling. The liquid receiver heat exchanger is connected to the outlet of the condenser via a pipeline. The liquid receiver is connected to the outlet of the heat exchanger and the inlet of the circulating pump via a pipeline. The liquid receiver includes a first cavity, a second cavity, and an elastic diaphragm. The elastic diaphragm separates the first cavity and the second cavity and is located between the first cavity and the second cavity. The first cavity is connected to the inlet of the circulating pump. Since the first cavity is connected to the system loop, the pressure in the first cavity is the same as the pressure in the system loop. When the pressure in the second cavity is greater than or less than the pressure in the first cavity, i.e., the pressure in the first cavity... When the pressure inside the second chamber is greater than or less than the pressure in the system loop, the volume of the second chamber increases or decreases to regulate the pressure in the loop system. When the pressure in the system loop is too low, the volume of the second chamber increases and the volume of the first chamber decreases. At this time, the working fluid in the first chamber flows in the system loop, and the pressure in the system loop increases. When the pressure in the system loop is too high, the volume of the second chamber decreases and the volume of the first chamber increases. At this time, the working fluid in the system loop flows into the first chamber, and the pressure in the system loop decreases. This achieves a balance between the pressure of the liquid reservoir and the system loop. When the heat-generating equipment starts or stops, the pressure in the system loop can be regulated by increasing or decreasing the volume of the second chamber. Regardless of whether the heat-generating equipment is started or stopped, most of the evaporator in the system loop is in a two-phase heat exchange state, thereby ensuring that the temperature gradient of the evaporator is small, thus keeping the heat-generating equipment within the required temperature gradient range and ensuring the normal operation of the heat-generating equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in specific embodiments of the present invention or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a partial structural schematic diagram of the pump-driven two-phase fluid circuit system according to an embodiment of the present invention;

[0018] Figure 2This is a partial structural schematic diagram of another embodiment of the pump-driven two-phase fluid loop system of the present invention;

[0019] Figure 3 This is a partial side cross-sectional view of the liquid reservoir of the pump-driven two-phase fluid loop system according to an embodiment of the present invention;

[0020] Figure 4 This is a partial side cross-sectional view of the reservoir structure of another embodiment of the pump-driven two-phase fluid circuit system of the present invention;

[0021] Figure 5 This is a pressure-temperature characteristic curve of the working fluid in different cavities within the reservoir of the pump-driven two-phase fluid circuit system according to an embodiment of the present invention. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 1The pump-driven two-phase fluid loop system 100 includes a circulating pump 10, an evaporator 20, a condenser 30, a liquid receiver 40, and a heat exchanger 50. The outlet of the circulating pump 10 is connected to the inlet of the evaporator 20, which is attached to the surface of the heat-generating equipment. The inlet of the condenser 30 is connected to the outlet of the evaporator 20, and the outlet of the condenser 30 is connected to the inlet of the heat exchanger 50. The liquid receiver 40 is connected to the outlet of the heat exchanger 50 and the inlet of the circulating pump 10 via a pipeline. Driven by the circulating pump 10, the working fluid flows into the evaporator 20. After entering the evaporator 20, the working fluid absorbs heat and changes from a single phase to a gas-liquid two-phase state. The flowing gas-liquid two-phase working fluid carries away the heat generated by the heat-generating equipment and releases heat through the condenser 30, changing from a gas-liquid two-phase state to a liquid state. The liquid working fluid flows through the heat exchanger 50 into the liquid receiver 40, and then into the circulating pump 10, forming a cycle. The following is a detailed description of the circulating pump 10, evaporator 20, condenser 30, liquid receiver 40, and heat exchanger 50.

[0026] For the aforementioned circulating pump 10 and evaporator 20, as Figure 1 As shown, the outlet of the circulating pump 10 is connected to the evaporator 20 through a pipeline. The circulating pump 10 is used to drive the fluid to flow in the pipeline and drive the fluid to flow into the evaporator 20. The evaporator 20 is used to heat at least part of the fluid to form steam. The evaporator 20 is attached to the surface of the heat-generating device 60. The steam and fluid flowing out of the evaporator 20 flow through the heat-generating device 60 and carry the heat generated by the heat-generating device 60 to the condenser 30 for cooling, thereby achieving heat dissipation of the heat-generating device 60 so that the heat-generating device 60 is within a preset temperature range, ensuring the normal operation of the generating device.

[0027] For the aforementioned condenser 30, liquid receiver 40, and heat exchanger 50, such as Figure 1 As shown, the inlet of the condenser 30 is connected to the outlet of the evaporator 20 via a pipe. The condenser 30 is used to condense the fluid into a subcooled fluid. The liquid formed by condensation in the condenser 30 flows into the inlet of the heat exchanger 50. The liquid receiver 40 is connected to the outlet of the heat exchanger 50 and the inlet of the circulation pump 10 via a pipe. The liquid receiver 40 can be used to store the liquid working fluid and can also be used as a control unit for the operating temperature of the system loop. The user can set the temperature of the liquid receiver 40 to ensure the cooling capacity of the system loop. Optionally, the outlet of the heat exchanger 50 is connected to the inlet of the liquid receiver 40 via a pipe, and the outlet of the liquid receiver 40 is connected to the inlet of the circulation pump 10 via a pipe, thereby forming a system circulation. Alternatively, as... Figure 2As shown, the liquid reservoir 40 is connected to the outlet of the heat exchanger 50 and the inlet of the circulating pump 10 via a single pipeline.

[0028] Please refer to the following for details. Figure 3 and Figure 4 The reservoir 40 includes a first cavity 40a, a second cavity 40b, and an elastic diaphragm 40c. The elastic diaphragm 40c separates the first cavity 40a and the second cavity 40b, and is located between the first cavity 40a and the second cavity 40b. The first cavity 40a is connected to the inlet of the circulation pump 10. The elastic diaphragm 40c bends toward either the first cavity 40a or the second cavity 40b due to the different pressures within the first cavity 40a and the second cavity 40b. When the elastic diaphragm 40c bends toward the first cavity 40a, the volume of the first cavity 40a decreases, and the volume of the second cavity 40b increases. When the elastic diaphragm 40c bends toward the second cavity 40b, the volume of the first cavity 40a increases, and the volume of the second cavity 40b decreases, thereby ensuring pressure balance within the reservoir 40. It should be noted that the elastic diaphragm 40c bends towards the first cavity 40a or the second cavity 40b because the pressure inside the second cavity 40b is greater or less than the pressure inside the first cavity 40a. Subsequently, the volume of the second cavity 40b increases or decreases to regulate the pressure in the circuit system. Optionally, the second cavity 40b is a closed cavity.

[0029] It is understood that: since the first cavity 40a is connected to the inlet of the circulating pump 10, the working pressure in the first cavity 40a is the same as the pressure in the loop system. When the pressure in the second cavity 40b is greater than the pressure in the first cavity 40a, the working fluid in the second cavity 40b pushes the elastic diaphragm 40c to bend towards the first cavity 40a, reducing the volume of the first cavity 40a. The working fluid in the first cavity 40a flows into the loop system, increasing the pressure in the loop system. When the pressure in the second cavity 40b is less than the pressure in the first cavity 40a, the working fluid in the first cavity 40a pushes the elastic diaphragm 40c towards the second cavity 40b, increasing the volume of the first cavity 40a. The first cavity 40a can accommodate the working fluid in the loop system, reducing the pressure in the loop system, thereby achieving the regulation of the loop system pressure.

[0030] In some embodiments, the reservoir 40 includes a housing 401, and a heat exchanger 50 is disposed on the outer surface of the housing 401. The heat exchanger 50 is located near the second cavity 40b, and the inlet of the heat exchanger 50 is connected to the outlet of the condenser 30. The outlet of the heat exchanger 50 communicates with the first cavity 40a. The working fluid flowing out of the condenser 30 flows into the heat exchanger 50. The heat exchanger 50 can enhance the heat exchange between the working fluid and the reservoir 40 to control the working fluid flowing out of the condenser 30 within a preset temperature range. The working fluid at the outlet of the condenser 30 first passes through the heat exchanger 50, and the second cavity 40b exchanges heat fully with the heat exchanger 50, so that the temperature inside the second cavity 40b is close to the temperature of the working fluid at the outlet of the condenser 30. Therefore, the temperature inside the second cavity 40b can change with the temperature of the working fluid at the outlet of the condenser 30. Optionally, when the working fluid temperature at the outlet of the condenser 30 increases, the volume of the second cavity 40b increases, the volume of the first cavity 40a decreases, and the pressure in the loop system increases; when the working fluid temperature at the outlet of the condenser 30 decreases, the volume of the second cavity 40b decreases, the volume of the first cavity 40a increases, and the pressure in the loop system decreases.

[0031] In some embodiments, the reservoir 40 further includes a temperature controller 403, which is disposed on the side of the housing 401 near the second cavity 40b. The temperature controller 403 is used to control the temperature inside the second cavity 40b and to heat or cool the temperature inside the second cavity 40b, thereby improving the response speed of the temperature control of the reservoir 40.

[0032] In some embodiments, a first working fluid (not shown) is disposed in the first cavity 40a, and a second working fluid (not shown) is disposed in the second cavity 40b. The pressures of both the first and second working fluids change with the temperature of the reservoir 40, and at the same temperature, the pressure of the second working fluid is greater than the saturation pressure of the first working fluid. Optionally, the pressure-temperature characteristic curve of the first working fluid is nearly parallel to the pressure-temperature characteristic curve of the second working fluid (the saturation pressure-temperature characteristic curve of the loop working fluid). This arrangement makes the loop system more stable during the pressure balance adjustment process in the second cavity 40b. It should be noted that the working fluid in the first cavity 40a can be a single working fluid or a mixture of working fluids, and the working fluid in the second cavity 40b can be a single working fluid or a mixture of working fluids. This application does not specifically limit the application to the requirement that, at the same temperature, the pressure of the second working fluid is greater than the pressure of the first working fluid (loop pressure).

[0033] In some embodiments, the second cavity 40b is a closed cavity, and the second working fluid exchanges heat with the working fluid at the outlet of the condenser 30 through the inner wall of the liquid reservoir 40 and the heat exchanger 50. When the temperature of the working fluid at the outlet of the condenser 30 is greater than or less than the temperature of the second working fluid in the second cavity 40b, the second working fluid absorbs or releases heat, and the second cavity 40b expands or contracts, thereby regulating the pressure of the loop system.

[0034] The following explanation uses R134a as the first working medium and R22 as the second working medium as an example. Figure 5 As shown, at the same temperature, the pressure inside the second cavity 40b is higher than the saturation pressure inside the first cavity 40a.

[0035] The temperature of the liquid reservoir 40 is preset to 20°C, according to Figure 5 It can be seen that at this time, the pressure inside the second cavity 40b is 0.91 MPa. During stable operation, the working fluid in the system loop evaporates at a temperature of approximately 36°C in the evaporator 20. When the pressure of the loop system is less than 0.91 MPa, the second cavity 40b expands, compressing the first cavity 40a to replenish the working fluid in the loop system and increase the pressure of the loop system. When the pressure of the loop system is greater than 0.91 MPa, the second cavity 40b contracts, the volume of the first cavity 40a increases, the reservoir 40 accommodates the excess working fluid, and the pressure of the loop system decreases. The liquid storage tank 40 can automatically adjust its working pressure according to the heat load change of the loop system, that is, the working fluid temperature at the outlet of the condenser 30, so as to achieve the purpose of adaptive adjustment. When the heat generating equipment 60 (heat load) is started or stopped, the pressure in the system loop can be adjusted by increasing or decreasing the volume of the second cavity 40b. Regardless of whether the heat generating equipment 60 is in the start-up or shutdown state, most of the evaporator 20 in the system loop is in a two-phase heat exchange state, thereby ensuring that the temperature gradient before and after the heat generating equipment 60 is small or within a preset range, so that the heat generating equipment 60 is in an environment within the preset temperature range, thereby ensuring the normal operation of the heat generating equipment 60.

[0036] In this embodiment of the invention, a circulating pump 10, an evaporator 20, a condenser 30, a liquid receiver 40, and a heat exchanger 50 are provided. The circulating pump 10 drives the fluid to flow in the pipeline. The inlet of the evaporator 20 is connected to the outlet of the circulating pump 10 via a pipeline. The evaporator 20 is attached to the surface of the heat-generating device 60 and is used to dissipate heat from the heat-generating device 60 and heat at least part of the fluid to form steam. The inlet of the condenser 30 is connected to the outlet of the evaporator 20 via a pipeline. The condenser 30 is used to condense the fluid into a subcooled fluid. The inlet of the heat exchanger 50 is connected to the outlet of the condenser 30 via a pipeline. The liquid receiver 40 is connected to the outlet of the evaporator 20 via a pipeline. The heat exchanger 50 has an outlet and the circulation pump 10 has an inlet. The reservoir 40 includes a first chamber 40a, a second chamber 40b, and an elastic diaphragm 40c. The elastic diaphragm 40c separates the first chamber 40a and the second chamber 40b, and is located between the first chamber 40a and the second chamber 40b. The first chamber 40a is connected to the inlet of the circulation pump 10. Since the first chamber 40a is connected to the system loop, the pressure in the first chamber 40a is the same as the pressure in the system loop. When the second chamber 40a... When the pressure inside cavity 40b is greater than or less than the pressure inside the first cavity 40a (i.e., when the pressure inside the second cavity 40b is greater than or less than the pressure in the system loop), the volume of the second cavity 40b increases or decreases to regulate the pressure in the loop system. When the pressure in the system loop is too low, the volume of the second cavity 40b increases, and the volume of the first cavity 40a decreases. At this time, the working fluid in the first cavity 40a flows in the system loop, and the pressure in the system loop increases. When the pressure in the system loop is too high, the volume of the second cavity 40b decreases, and the volume of the first cavity 40a decreases. When the pressure increases, the working fluid in the system loop flows into the first cavity 40a, and the pressure in the system loop decreases, thereby achieving a balance between the pressure of the liquid reservoir 40 and the system loop. When the heat generating equipment 60 is started or stopped, the pressure in the system loop can be adjusted through the second cavity 40b. Regardless of whether the heat generating equipment 60 is started or stopped, most of the evaporator 20 in the system loop is in a two-phase heat exchange state, thereby ensuring that the temperature gradient of the evaporator 20 is small, and thus keeping the heat generating equipment 60 within the required temperature gradient range, thereby ensuring the normal operation of the heat generating equipment 60.

[0037] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pump-driven two-phase fluid loop system, applied to heat-generating equipment, characterized in that, include: A circulating pump, used to drive fluid flow in a pipeline; An evaporator, the inlet of which is connected to the outlet of the circulating pump via a pipeline, the evaporator being attached to the surface of the heat-generating equipment, the evaporator being used to dissipate heat from the heat-generating equipment and to heat at least part of the fluid to form steam; A condenser, the inlet of which is connected to the outlet of the evaporator via a pipe, is used to condense the fluid into a subcooled fluid; A heat exchanger, wherein the inlet of the heat exchanger is connected to the outlet of the condenser via a pipeline; A liquid reservoir is provided, which is connected to the outlet of the heat exchanger and the inlet of the circulating pump via a pipeline. The liquid reservoir includes a first cavity, a second cavity, and an elastic diaphragm. The elastic diaphragm separates the first cavity and the second cavity and is located between the first cavity and the second cavity. The first cavity is connected to the inlet of the circulating pump. The second cavity is a closed cavity. When the pressure in the second cavity is greater than or less than the pressure in the first cavity, the volume of the second cavity increases or decreases to regulate the pressure in the loop system. The heat exchanger is attached to the outer surface of the liquid reservoir, the heat exchanger is located near the second cavity of the liquid reservoir, and the outlet of the heat exchanger is connected to the first cavity; When the working fluid temperature at the outlet of the condenser increases, the volume of the second cavity increases, the volume of the first cavity decreases, and the pressure in the loop system increases. When the working fluid temperature at the outlet of the condenser decreases, the volume of the second cavity decreases, the volume of the first cavity increases, and the pressure in the loop system decreases.

2. The pump-driven two-phase fluid circuit system according to claim 1, characterized in that, When the pressure in the second cavity is greater than the pressure in the first cavity, the working fluid in the second cavity pushes the elastic diaphragm to bend toward the first cavity, the volume of the first cavity decreases, and the pressure in the loop system increases. When the pressure in the second cavity is less than the pressure in the first cavity, the working fluid in the first cavity pushes the elastic diaphragm to bend toward the second cavity, the volume of the first cavity increases, and the pressure in the loop system decreases.

3. The pump-driven two-phase fluid circuit system according to claim 1, characterized in that, The second cavity is a closed cavity, and the second working fluid is filled in the second cavity. The second working fluid exchanges heat with the working fluid at the outlet of the condenser through the inner wall of the liquid reservoir and the heat exchanger. When the temperature of the working fluid at the outlet of the condenser is greater than or less than the temperature of the second working fluid in the second cavity, the second working fluid absorbs or releases heat, and the second cavity expands or contracts.

4. The pump-driven two-phase fluid circuit system according to claim 1, characterized in that, The liquid reservoir also includes a temperature controller, which is located on the side of the liquid reservoir housing near the second cavity, and is used to control the temperature inside the second cavity.

5. The pump-driven two-phase fluid circuit system according to claim 2, characterized in that, The first cavity contains a first working fluid, and the second cavity contains a second working fluid. The saturation pressure of the first working fluid and the pressure of the second working fluid both change with the temperature of the reservoir. At the same temperature, the pressure of the second working fluid is greater than the saturation pressure of the first working fluid.

6. The pump-driven two-phase fluid circuit system according to claim 5, characterized in that, The first working medium is R134a, and the second working medium is R22.

7. The pump-driven two-phase fluid circuit system according to claim 1, characterized in that, The liquid reservoir must meet at least one of the following conditions: The working medium in the first cavity is a single working medium or a mixture of working media; The working medium in the second cavity is a single working medium or a mixture of working mediums.

Images