A two-phase accumulator liquid discharge and suction control characteristic test device and test method

Abstract

The application discloses a two-phase accumulator liquid discharging and absorbing control characteristic test device and a test method. The method simulates the operation process of discharging working medium when the two-phase accumulator is heated and absorbing working medium when the two-phase accumulator is cooled during work, and quantitatively tests the total amount of working medium outflow and inflow of the two-phase accumulator under different heat inputs. Meanwhile, the flow and heat transfer response characteristics of the two-phase accumulator are tested to determine whether the accumulator meets the design and use requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of spacecraft thermal control, and relates to a two-phase reservoir liquid discharge and liquid absorption control characteristic test device and a test method. BACKGROUND

[0002] With the continuous development of space remote sensing technology, the temperature precision requirement of optical remote sensors for their core devices (such as CCD components or CMOS components) is higher and higher, the required heat transfer capacity and heat transfer distance are increasing, and more and more places need to use mechanical pump driven two-phase fluid loop (MPTL) technology for thermal control design. Figure 1 The reservoir is equivalent to the "brain" of the system and is the control center of the system, which plays a role in controlling the temperature of the system, adjusting the fluid distribution between the main loop and the reservoir, and managing the gas-liquid two-phase fluid under microgravity conditions. The working medium in the reservoir is in a saturated state, and the saturation temperature and saturation pressure are one-to-one corresponding, which can control the saturation pressure through the gas phase temperature, and then control the total amount of working medium in the reservoir.

[0003] The internal of the two-phase temperature control type reservoir is two-phase saturated working medium, and the pressure can be controlled by controlling the temperature of the saturated fluid in the reservoir, and the exchange between the working medium and the main loop can be realized. Therefore, the two-phase temperature control type reservoir is more popular, and MPTL technology generally selects it as the control component of the system.

[0004] The related research on the control characteristics of the reservoir has been continuously concerned, especially the quantitative research on the fluid outflow (or inflow) after the heat (or cold) input. The feasibility experiment of the above quantitative research will directly affect the development process of the mechanical pump driven two-phase fluid loop reservoir. The core device of the optical remote sensor is in a periodic working mode. When the remote sensing camera is imaging, the core device starts to work, and the heat generated by the work needs to be taken away by the mechanical pump driven two-phase fluid loop. During this period, the mechanical pump driven two-phase fluid loop works, and the reservoir needs to discharge a certain amount of working medium into the fluid loop according to the different heat dissipation power; when the remote sensing camera is not imaging, the core device does not work, and the core device needs to be insulated during this process, and a certain amount of working medium in the fluid loop is stored back into the reservoir.

[0005] In order to verify the control characteristics of the mechanical pump driven two-phase fluid loop reservoir, the quantitative test of the control characteristics of the reservoir needs to be carried out on the ground to verify whether the mechanical pump driven two-phase fluid loop reservoir can meet the use requirements of effectively controlling the inflow and outflow of the fluid in the reservoir and the loop during the on-orbit work, and whether the control characteristics of the mechanical pump driven two-phase fluid loop reservoir meet the design requirements during the service life. SUMMARY

[0006] The technical problems to be solved by the present application are: the present application provides a two-phase reservoir liquid discharge and liquid absorption control characteristic test device and test method, which can effectively simulate the control performance and control response characteristics of the reservoir for the mechanical pump driven two-phase fluid circuit during the life of the tank to ensure the reliability during long-term application in orbit.

[0007] The technical solution adopted by the present application is: a two-phase reservoir liquid discharge and liquid absorption control characteristic test device, comprising: a container, a refrigeration / heating pipeline, a refrigerator, a flow meter, a thermal insulation material, a liquid level meter, a valve, an exhaust pipeline, a working fluid pipeline, a vacuum pumping pipeline, a pressure sensor, a temperature measuring thermocouple;

[0008] The volume of the to-be-tested reservoir is the same as that of the container, the to-be-tested reservoir and the container are connected through a pipeline, valve 8 and valve 9 are used to control the communication state between the to-be-tested reservoir and the container, and the to-be-tested reservoir is surrounded by a thermal insulation material; the refrigeration / heating pipeline for adjusting the temperature of the to-be-tested reservoir is connected to the bottom liquid phase zone and the upper gas phase zone of the to-be-tested reservoir, the refrigeration / heating pipeline is connected to the refrigerator with adjustable internal refrigerant temperature, the flow of the two sections of the refrigeration / heating pipeline connected to the bottom liquid phase zone and the upper gas phase zone of the to-be-tested reservoir is adjusted through valve 6 and valve 7, the flow meter is used to test the flow out of the refrigerator, and the temperature measuring thermocouples TC3 and TC4 are used to monitor the gas phase and liquid phase temperatures in the to-be-tested reservoir respectively; the pressure sensor 2 is used to monitor the pressure of the working fluid in the to-be-tested reservoir, and is connected to the to-be-tested reservoir and valve 5 through a three-way valve 2, valve 5 is connected to the exhaust pipeline for discharging the to-be-tested working fluid, a plurality of temperature measuring thermocouples are installed on the wall surface of the to-be-tested reservoir for monitoring the temperature changes at different positions;

[0009] The container is connected to the liquid level meter through a pipeline for monitoring the height change of the working fluid in the container; the temperature measuring thermocouples TC1 and TC2 are used to monitor the liquid phase and gas phase temperatures in the container respectively, and the pressure sensor 1 is used to monitor the pressure of the working fluid in the container and is connected to the container and valve 4 through a three-way valve 1, valve 4 is connected to the exhaust pipeline for discharging the to-be-tested working fluid; the vacuum pumping pipeline is connected to the container through valve 2 and valve 3 and is used for vacuum pumping; the working fluid pipeline is connected to the container through valve 1 and valve 3 for working fluid injection.

[0010] Further, the total change amount of the working fluid is calculated by the change of the liquid level height of the container through the liquid level meter, and the simulation of the working fluid change amount in the circuit is realized.

[0011] Further, the working fluid tested by the test device includes ammonia, CO2, freon and propane.

[0012] The test method using the two-phase reservoir liquid discharge and liquid absorption control characteristic test device comprises:

[0013] Opening valve 2, valve 3, valve 8, valve 9, closing valve 1, valve 4, valve 5, vacuum pipeline connection vacuum pump, using vacuum pump to the test device vacuum;

[0014] Opening valve 1, valve 3, valve 8, valve 9, closing valve 2, valve 4, valve 5, a set amount of test working medium into the container and the measured reservoir, until the container and the measured reservoir liquid level to reach the set liquid level height ht;

[0015] Close valve 1 and valve 3, the test device after injection of working medium in the laboratory for a period of time t1, until the temperature difference between all temperature measuring thermocouple measuring points and the ambient temperature Te absolute value is less than the set threshold a;

[0016] The measured reservoir is heated, the flow rate of the flow meter, the temperature values of the temperature measuring points arranged on the measured reservoir, the height change values of the liquid level meter and the total time length of the working medium discharge are recorded, and the discharge performance test of the measured reservoir is carried out;

[0017] The test device is stabilized in the laboratory for a period of time t2, until the temperature difference between all temperature measuring thermocouple measuring points and the ambient temperature Te absolute value is less than the set threshold a;

[0018] The measured reservoir is cooled, the flow rate of the flow meter, the temperature values of the temperature measuring points arranged on the measured reservoir, the height change values of the liquid level meter and the total time length of the working medium suction are recorded, and the liquid suction performance test of the measured reservoir is carried out;

[0019] The discharge and liquid suction performance of the measured reservoir is analyzed to determine whether it meets the requirements.

[0020] Further, the ht satisfies 0.2H≤ht≤0.8H, H is the height of the container.

[0021] Further, the measured reservoir is heated, the flow rate of the flow meter, the temperature values of the temperature measuring points arranged on the measured reservoir, the height change values of the liquid level meter and the total time length of the working medium discharge are recorded, and the discharge performance test of the measured reservoir is carried out, comprising:

[0022] The refrigeration / heating pipeline connected to the bottom and upper part of the measured reservoir is connected to the hot water with a temperature of Te+ΔT1, and the measured reservoir is heated, wherein ΔT1 is a positive value;

[0023] The difference ΔT2 between the average temperature of the several temperature measuring points arranged on the measured reservoir and the temperature of the flowing water in the refrigerator is obtained by the flow meter, and the heat Q1 transferred between the refrigerator and the measured reservoir is calculated, wherein ΔT2 is a positive value;

[0024] Record the change value of the liquid level meter height Δh1 connected with the container, and calculate the increase amount of the working medium in the container by the known bottom area of the container, wherein Δh1 is positive;

[0025] Record the pressure change values ΔP1 and ΔP2 of the pressure sensor 1 and the pressure sensor 2, and when ΔP1 and ΔP2 are both less than 0.001 MPa, it is considered that the working medium discharge process is completed;

[0026] Record the total time t1 of the working medium discharge, and stop heating the measured reservoir.

[0027] Further, the measured reservoir is cooled, the flow rate of the flow meter, the temperature values of the temperature measuring points arranged on the measured reservoir, the change value of the liquid level meter height, and the total time of the working medium absorption are recorded, and the absorption performance test of the measured reservoir is performed, including:

[0028] The cooling water with a temperature of Te-ΔT2 is introduced into the refrigeration / heating pipeline connected to the bottom and upper positions of the measured reservoir to cool the measured reservoir, wherein ΔT2 is positive;

[0029] The difference ΔT3 between the flow rate m2 obtained by the flow meter and the temperature of the flowing water in the refrigerator is calculated, and the cooling capacity Q2 transferred between the refrigerator and the measured reservoir is calculated, wherein ΔT3 is positive;

[0030] Record the change value Δh2 of the liquid level meter height connected with the container, and calculate the decrease amount of the working medium in the container by the known bottom area of the container, wherein Δh2 is positive;

[0031] Record the pressure change ΔP1 and ΔP2 of the pressure sensor 1 and the pressure sensor 2, and when ΔP1 and ΔP2 are both less than 0.001 MPa, it is considered that the working medium absorption process is completed;

[0032] Record the total time t2 of the working medium absorption, and stop cooling the measured reservoir.

[0033] Further, the analysis of whether the liquid discharge and absorption performance of the measured reservoir meets the requirements includes:

[0034] Whether the liquid discharge and absorption rate of the measured reservoir meets the requirements is analyzed by the numerical change of the liquid level meter height:

[0035] The height change calculation value Δhc1 corresponding to the heat Q1 meets:

[0036]

[0037] In the formula, h lv is the latent heat of vaporization of the working medium, ρ lρ is the density of the working fluid, A is the area of the container, and t is time.

[0038] The difference between the calculated height change value Δhc1 and the liquid level gauge height change value Δh1 is compared, and when |Δhc1-Δh1|≤0.001Δhc1, the liquid discharge rate of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid discharge rate of the to-be-tested liquid reservoir does not meet the requirements.

[0039] The calculated height change value Δhc2 corresponding to the cold quantity Q2 meets:

[0040]

[0041] The difference between the calculated height change value Δhc2 and the liquid level gauge height change value Δh2 is compared, and when |Δhc2-Δh1|≤0.001Δhc2, the liquid absorption rate of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid absorption rate of the to-be-tested liquid reservoir does not meet the requirements.

[0042] Further, the analysis of whether the liquid discharge and absorption performance of the to-be-tested liquid reservoir meets the requirements further comprises:

[0043] The total liquid discharge time t1 of the working fluid is analyzed to determine whether the liquid discharge time of the to-be-tested liquid reservoir meets the requirements: when the liquid discharge time design value t1r and the test total time t1 meet |t1r-t1|≤0.01t1r, the liquid discharge time of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid discharge time of the to-be-tested liquid reservoir does not meet the requirements.

[0044] Further, the analysis of whether the liquid discharge and absorption performance of the to-be-tested liquid reservoir meets the requirements further comprises:

[0045] The total liquid absorption time t2 of the working fluid is analyzed to determine whether the liquid absorption time of the to-be-tested liquid reservoir meets the requirements: when the liquid absorption time design value t2r and the test total time t2 meet |t2r-t2|≤0.01t2r, the liquid absorption time of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid absorption time of the to-be-tested liquid reservoir does not meet the requirements.

[0046] Compared with the prior art, the present application has the following advantages:

[0047] (1) The test method of the present application can accelerate the simulation of the control effect of the total working fluid amount in the loop during the operation of the liquid reservoir, detect whether the liquid reservoir is effective in the whole cycle in space, and ensure the reliability of the liquid reservoir in the application process of the space remote sensor.

[0048] (2) The test method of the present application can test the time response characteristics of the accumulator to heat input. When the heat input of the saturated accumulator changes, the internal saturated pressure changes almost like a certain time delay, which in turn causes the flow change to be delayed, affecting the temperature control of the heat source by the evaporator. By testing the delay response characteristics of the accumulator, the timing of starting the accumulator in advance can be calculated, which can be used as a criterion to determine whether the mechanical pump driven two-phase fluid circuit meets the starting requirements of the remote sensor temperature control.

[0049] (3) The test method of the present application can quickly verify the working performance, control characteristics and response characteristics of the accumulator, greatly shorten the time required for accumulator testing, improve the testing accuracy and accuracy, and save a lot of manpower and material resources.

[0050] (4) The test method of the present application can reduce the flow fluctuation and instability phenomenon caused by the accumulator, ensure the stability of the temperature of the remote sensor during operation, avoid the influence of temperature fluctuation on camera imaging, and improve the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a schematic diagram of a mechanical pump driven two-phase fluid circuit;

[0052] Figure 2 is a schematic diagram of the test device of the present application;

[0053] Figure 3 is a flow chart of the method of the present application. DETAILED DESCRIPTION

[0054] The specific embodiments of the present application are further described in detail below with reference to the accompanying drawings, and the following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0055] The present application provides a two-phase accumulator liquid discharge control characteristic test device and test method, which can effectively simulate the working performance, control characteristics and delay response characteristics of the accumulator during operation to ensure its reliability during long-term application in orbit.

[0056] As shown in Figure 2 A two-phase accumulator liquid discharge and liquid suction control characteristic test device, characterized in that it comprises: a container, a refrigeration / heating pipeline, a refrigerator, a flow meter, a heat insulating material, a liquid level meter, a valve, an exhaust pipeline, a working fluid pipeline, a vacuum pipeline, a pressure sensor, a temperature measuring thermocouple;

[0057] The to-be-tested accumulator has the same volume as the container, and is connected to the container through a pipeline. Valves 8 and 9 are used to control the communication state between the to-be-tested accumulator and the container. The to-be-tested accumulator is surrounded by a heat insulation material. A refrigeration / heating pipeline for adjusting the temperature of the to-be-tested accumulator is connected to the bottom liquid phase zone and the upper gas phase zone of the to-be-tested accumulator. The refrigeration / heating pipeline is connected to a refrigeration machine with an adjustable internal refrigerant temperature. The flow of the two sections of the refrigeration / heating pipeline connected to the bottom liquid phase zone and the upper gas phase zone of the to-be-tested accumulator is adjusted through valves 6 and 7. A flow meter is used to test the flow rate of the refrigeration machine. Thermocouples TC3 and TC4 are used to monitor the gas phase and liquid phase temperatures in the to-be-tested accumulator, respectively. A pressure sensor 2 is used to monitor the pressure of the working medium in the to-be-tested accumulator, and is connected to the to-be-tested accumulator and valve 5 through a three-way valve 2. Valve 5 is connected to a discharge pipeline for discharging the to-be-tested working medium. A plurality of thermocouples are installed on the wall surface of the to-be-tested accumulator to monitor the temperature changes at different positions.

[0058] The container is connected to a liquid level meter through a pipeline to monitor the height change of the working medium in the container. Thermocouples TC1 and TC2 are used to monitor the liquid phase and gas phase temperatures in the container, respectively. A pressure sensor 1 is used to monitor the pressure of the working medium in the container and is connected to the container and valve 4 through a three-way valve 1. Valve 4 is connected to a discharge pipeline for discharging the to-be-tested working medium. A vacuum pipeline is connected to the container through valves 2 and 3 and is used for vacuumizing. A working medium pipeline is connected to the container through valves 1 and 3 and is used for injecting the working medium.

[0059] The container is connected to a liquid level meter, and the total change amount of the working medium can be calculated by the change of the liquid level height, so as to realize the simulation of the working medium change amount in the loop.

[0060] The working medium that can be tested by the device includes ammonia, CO2, freon, propane, and other commonly used working media of space two-phase flow thermal control equipment.

[0061] As shown in Figure 3 A two-phase accumulator liquid discharge control characteristic test method, including the following steps:

[0062] Step 1: Vacuumize the test device, open valves 2, 3, 8, and 9, and close valves 1, 4, and 5. Connect the vacuum pipeline to the vacuum pump. Use the negative pressure of the vacuum pump to exhaust the air in the test device.

[0063] Step 2: Inject the working medium. Open valves 1, 3, 8, and 9, and close valves 2, 4, and 5. Inject a set amount of test working medium into the container and the to-be-tested accumulator until the liquid level in the container and the to-be-tested accumulator reaches a set liquid level height ht. ht satisfies 0.2H≤ht≤0.8H, and H represents the height of the container.

[0064] Step three: close valve 1 and valve 3, and let the test device with injected working medium stabilize in the laboratory (ambient temperature is Te) for a period of time t1 (t1≥30 min) until the absolute value of the difference between the temperature of all temperature measuring thermocouples and the ambient temperature Te is less than 0.1℃;

[0065] Step four: pass hot water with a temperature of Te+ΔT1 flowing into the refrigeration / heating pipeline connected to the bottom and upper position of the to-be-tested accumulator, and heat the to-be-tested accumulator, wherein ΔT1 is a positive value;

[0066] Step five: obtain the flow rate m1 by the flow meter, the difference ΔT2 between the average temperature of the several temperature measuring points arranged on the to-be-tested accumulator and the temperature of the water flowing in the refrigerator, and calculate the heat Q1 transferred between the refrigerator and the to-be-tested accumulator, wherein ΔT2 is a positive value;

[0067] Step six: record the change value Δh1 of the height of the liquid level meter connected to the container, and calculate the increase of the working medium in the container by the known bottom area of the container, wherein Δh1 is a positive value;

[0068] Step seven: record the pressure change values ΔP1 and ΔP2 of pressure sensor 1 and pressure sensor 2, and when both ΔP1 and ΔP2 are less than 0.001 MPa, it is considered that the discharge process of the working medium is completed;

[0069] Step eight: record the total duration t1 of the discharge of the working medium, and stop passing hot water with a temperature of Te+ΔT1 into the refrigeration / heating pipeline connected to the bottom and upper position of the to-be-tested accumulator, i.e. stop heating the to-be-tested accumulator;

[0070] Step nine: let the test device stabilize in the laboratory (ambient temperature is Te) for a period of time t2 (t2≥30 min) until the absolute value of the difference between the temperature of all temperature measuring thermocouples and the ambient temperature Te is less than 0.1℃;

[0071] Step ten: pass cold water with a temperature of Te-ΔT2 flowing into the refrigeration / heating pipeline connected to the bottom and upper position of the to-be-tested accumulator, and cool the to-be-tested accumulator, wherein ΔT2 is a positive value;

[0072] Step eleven: obtain the flow rate m2 by the flow meter, the difference ΔT3 between the average temperature of the several temperature measuring points arranged on the to-be-tested accumulator and the temperature of the water flowing in the refrigerator, and calculate the cold quantity Q2 transferred between the refrigerator and the to-be-tested accumulator, wherein ΔT3 is a positive value;

[0073] Step twelve: record the change value Δh2 of the height of the liquid level meter connected to the container, and calculate the decrease of the working medium in the container by the known bottom area of the container, wherein Δh2 is a positive value;

[0074] Step 13: record the pressure changes ΔP1 and ΔP2 of the pressure sensor 1 and the pressure sensor 2, and when ΔP1 and ΔP2 are both less than 0.001 MPa, it is considered that the working fluid suction process is completed;

[0075] Step 14: record the total length t2 of the working fluid suction, stop the cold water with a temperature of Te-ΔT2 from being input into the refrigeration / heating pipeline connected to the bottom and the upper position of the measured reservoir, and cool the measured reservoir;

[0076] Step 15: analyze whether the drainage and suction performance of the measured reservoir meets the requirements:

[0077] Through the numerical change of the liquid level meter height, whether the drainage and suction rate of the measured reservoir meets the requirements is analyzed: the height change calculation value corresponding to the heat Q1 is calculated When the liquid level meter height change value Δh1 meets |Δhc1-Δh1|≤0.001Δhc1, the drainage rate of the measured reservoir meets the requirements, otherwise it does not meet the requirements; wherein, h lv is the latent heat of vaporization of the working fluid, ρ l is the liquid density of the working fluid, A is the area of the container, and t is the time.

[0078] The height change calculation value corresponding to the cold Q2 is calculated When the liquid level meter height change value Δh2 meets |Δhc2-Δh2|≤0.001Δhc2, the suction rate of the measured reservoir meets the requirements, otherwise it does not meet the requirements.

[0079] Through the total length t1 of the working fluid drainage, whether the drainage length of the measured reservoir meets the requirements is analyzed: when the drainage length design value t1r and the test total length t1 meet |t1r-t1|≤0.01t1r, the drainage length of the measured reservoir meets the requirements, otherwise it does not meet the requirements.

[0080] Through the total length t2 of the working fluid suction, whether the suction length of the measured reservoir meets the requirements is analyzed: when the suction length design value t2r and the test total length t2 meet |t2r-t2|≤0.01t2r, the suction length of the measured reservoir meets the requirements, otherwise it does not meet the requirements.

[0081] The test method of the application can also analyze the change law of the heating amount and the total amount of the working fluid discharged from the reservoir by changing the heating / cooling amount of the measured reservoir (including the change of the heating / cooling time, the heating / cooling heat flux density, etc.), the total amount of the working fluid in the measured reservoir, and the saturation state.

[0082] The part not described in detail in the application belongs to the known technology of those skilled in the art.

Claims

1. A two-phase accumulator liquid discharge and suction control characteristic test device, characterized by, Comprise: Container, refrigeration / heating pipeline, refrigerator, flowmeter, thermal insulation material, liquid level meter, valve, exhaust pipeline, working fluid pipeline, vacuum pipeline, pressure sensor, temperature measuring thermocouple; The volume of the to-be-tested storage tank is the same as that of the container. The to-be-tested storage tank and the container are connected through a pipeline. Valves 8 and 9 are used to control the communication state between the to-be-tested storage tank and the container. The to-be-tested storage tank is surrounded by thermal insulation material. The bottom liquid phase zone and the upper gas phase zone of the to-be-tested storage tank are respectively connected to refrigeration / heating pipelines for adjusting the temperature of the to-be-tested storage tank. The refrigeration / heating pipelines are connected to a refrigerator with adjustable internal refrigerant temperature. The flow of the two refrigeration / heating pipelines connected to the bottom liquid phase zone and the upper gas phase zone of the to-be-tested storage tank is adjusted through valves 6 and 7. A flowmeter is used to test the flow of the refrigerator. Temperature measuring thermocouples TC3 and TC4 are respectively used to monitor the gas phase and liquid phase temperatures in the to-be-tested storage tank. A pressure sensor 2 is used to monitor the pressure of the working fluid in the to-be-tested storage tank and is connected to the to-be-tested storage tank and valve 5 through a three-way valve 2. Valve 5 is connected to an exhaust pipeline for discharging the to-be-tested working fluid. A plurality of temperature measuring thermocouples are installed on the wall surface of the to-be-tested storage tank for monitoring the temperature changes at different positions. The container is connected to a liquid level meter through a pipeline for monitoring the height change of the working fluid in the container. Temperature measuring thermocouples TC1 and TC2 are respectively used to monitor the liquid phase and gas phase temperatures in the container. A pressure sensor 1 is used to monitor the pressure of the working fluid in the container and is connected to the container and valve 4 through a three-way valve 1. Valve 4 is connected to an exhaust pipeline for discharging the to-be-tested working fluid. A vacuum pipeline is connected to the container through valves 2 and 3 and is used for vacuumizing. A working fluid pipeline is connected to the container through valves 1 and 3 for injecting working fluid.

2. A two-phase accumulator liquid discharge and uptake control characteristic test device according to claim 1, characterized in that, The container calculates the total change of the working fluid by the change of the liquid level height of the liquid level meter, realizing the simulation of the working fluid change in the loop.

3. A two-phase accumulator fluid discharge and suction control characteristic test device according to claim 1, characterized in that, The working fluid tested by the test device includes ammonia, CO2, freon, and propane.

4. A test method for using the two-phase accumulator fluid discharge and suction control characteristic test apparatus according to any one of claims 1 to 3, characterized by, Comprise: Open valves 2, 3, 8, and 9, close valves 1, 4, and 5, connect the vacuum pipeline to the vacuum pump, and use the vacuum pump to vacuumize the test device; Open valves 1, 3, 8, and 9, close valves 2, 4, and 5, inject a set amount of test working fluid into the container and the to-be-tested storage tank, and adjust the liquid surface height of the container and the to-be-tested storage tank to a set height ht; Close valves 1 and 3, stabilize the test device in the laboratory for a period of time t1 after injecting the working fluid, and adjust the temperature of all temperature measuring thermocouples to be less than a set threshold a from the ambient temperature Te; Heat the to-be-tested storage tank, record the flow rate of the flowmeter, the temperature values of the temperature measuring points arranged on the to-be-tested storage tank, the height change value of the liquid level meter, and the total duration of working fluid discharge, and test the liquid discharge performance of the to-be-tested storage tank; Stabilize the test device in the laboratory for a period of time t2, and adjust the temperature of all temperature measuring thermocouple measuring points to be less than a set threshold a from the ambient temperature Te. Cooling the tested accumulator, recording the flow rate of the flow meter, the temperature values of the temperature measuring points arranged on the tested accumulator, the height change value of the liquid level meter, and the total time length of the working fluid absorption, to test the working fluid absorption performance of the tested accumulator; Analyzing whether the working fluid discharge and absorption performance of the tested accumulator meets the requirements.

5. The test method of claim 4, wherein, The ht satisfies 0.2H≤ht≤0.8H, and H is the height of the container.

6. The test method of claim 5, wherein, The method for testing the working fluid discharge performance of the tested accumulator comprises the following steps: Passing hot water with a temperature of Te+ΔT1 into the refrigeration / heating pipeline connected to the bottom and upper part of the tested accumulator to heat the tested accumulator, wherein ΔT1 is a positive value; Obtaining the difference ΔT2 between the average temperature of the several temperature measuring points arranged on the tested accumulator and the temperature of the water flowing in the refrigerator through the flow meter, and calculating the heat Q1 transferred between the tested accumulator and the refrigerator, wherein ΔT2 is a positive value; Recording the height change value Δh1 of the liquid level meter connected to the container, and calculating the working fluid increase in the container through the known bottom area of the container, wherein Δh1 is a positive value; Recording the pressure change values ΔP1 and ΔP2 of the pressure sensor 1 and the pressure sensor 2, and considering that the working fluid discharge process is completed when ΔP1 and ΔP2 are both less than 0.001 MPa; Recording the total time length t1 of the working fluid discharge, and stopping heating the tested accumulator.

7. The test method of claim 6, wherein, The method for testing the working fluid absorption performance of the tested accumulator comprises the following steps: Passing cold water with a temperature of Te-ΔT2 into the refrigeration / heating pipeline connected to the bottom and upper part of the tested accumulator to cool the tested accumulator, wherein ΔT2 is a positive value; Obtaining the difference ΔT3 between the average temperature of the several temperature measuring points arranged on the tested accumulator and the temperature of the water flowing in the refrigerator through the flow meter, and calculating the cold Q2 transferred between the tested accumulator and the refrigerator, wherein ΔT3 is a positive value; Recording the height change value Δh2 of the liquid level meter connected to the container, and calculating the working fluid decrease in the container through the known bottom area of the container, wherein Δh2 is a positive value; Recording the pressure change values ΔP1 and ΔP2 of the pressure sensor 1 and the pressure sensor 2, and considering that the working fluid absorption process is completed when ΔP1 and ΔP2 are both less than 0.001 MPa; Recording the total time length t2 of the working fluid absorption, and stopping cooling the tested accumulator.

8. The test method of claim 7, wherein, The method for analyzing whether the working fluid discharge and absorption performance of the tested accumulator meets the requirements comprises the following steps: Analyzing whether the working fluid discharge and absorption rates of the tested accumulator meet the requirements through the numerical change of the height of the liquid level meter: The height change calculation value Δhc1 corresponding to the heat Q1 satisfies: In the formula, h lv latent heat of vaporization of the working fluid, p l liquid density of the working fluid, A is the area of the container, and t is time. The difference between the height change calculation value Δhc1 and the liquid level meter height change value Δh1 is compared, and when |Δhc1-Δh1|≤0.001Δhc1, the liquid discharge rate of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid discharge rate of the to-be-tested liquid reservoir does not meet the requirements; The height change calculation value Δhc2 corresponding to the cold quantity Q2 meets: The difference between the height change calculation value Δhc2 and the liquid level meter height change value Δh2 is compared, and when |Δhc2-Δh2|≤0.001Δhc2, the liquid absorption rate of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid absorption rate of the to-be-tested liquid reservoir does not meet the requirements.

9. The test method of claim 8, wherein, The analysis of whether the liquid discharge and absorption performance of the to-be-tested liquid reservoir meets the requirements further includes: The total liquid discharge time t1 of the working medium is analyzed to determine whether the liquid discharge time of the to-be-tested liquid reservoir meets the requirements: when the liquid discharge time design value t1r and the total test time t1 meet |t1r-t1|≤0.01t1r, the liquid discharge time of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid discharge time of the to-be-tested liquid reservoir does not meet the requirements.

10. The test method of claim 9, wherein, The analysis of whether the liquid discharge and absorption performance of the to-be-tested liquid reservoir meets the requirements further includes: The total liquid absorption time t2 of the working medium is analyzed to determine whether the liquid absorption time of the to-be-tested liquid reservoir meets the requirements: when the liquid absorption time design value t2r and the total test time t2 meet |t2r-t2|≤0.01t2r, the liquid absorption time of the to-be-tested liquid reservoir meets the requirements, otherwise the liquid absorption time of the to-be-tested liquid reservoir does not meet the requirements.

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