A pump testing device

Abstract

The utility model discloses a pump testing arrangement, and the pump includes import, export, including liquid storage tank, liquid outlet pipeline, liquid inlet pipeline, cooling module, the liquid storage tank includes jar body and sets up the liquid outlet, liquid inlet on jar body, the liquid outlet the liquid inlet is used respectively for testing working medium flow and returns jar body, one end of liquid outlet pipeline is connected with the liquid outlet, and the other end is used for connecting with import, one end of liquid inlet pipeline is connected with the liquid inlet, and the other end is used for connecting with export, cooling module sets up on liquid inlet pipeline, is used for cooling the test working medium that exports by export, the utility model discloses a liquid storage tank, liquid outlet pipeline, liquid inlet pipeline and cooling module form the test circulating system with cooling to test working medium, make the pump can test under low boiling point test working medium, guarantee the normal working condition of test working medium through the cooling of cooling module, guarantee the safety and accuracy of performance test.

Description

Technical Field

[0001] This utility model relates to the field of pump testing technology, and specifically to a pump testing device. Background Technology

[0002] Currently, due to the difficulty in solving the cooling and liquefaction problem of test media when using closed-loop test systems with easily evaporating media such as refrigerants, pump testing is mostly focused on the torque output, pressure resistance, temperature resistance, and operation tests of the mechanical structure. However, there is no operation test simulating the user's use of various media, especially low-boiling-point media such as refrigerants. It is impossible to determine the pump's performance under low-boiling-point media, especially its dry suction capacity. This leads to the problem that pumps leaving the factory burn out due to insufficient dry suction capacity when the imported low-boiling-point media is severely vaporized in actual use.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] To address the problem mentioned in the background art that closed-loop pumps cannot be tested normally due to the vaporization of low-boiling-point working fluids upon heating, this utility model proposes a pump testing device that adds a cooling module for cooling the working fluid, enabling performance testing of low-boiling-point media used by users, thereby improving the accuracy and safety of the test.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: A pump testing device, the pump including an inlet and an outlet, including a liquid storage tank, an outlet pipeline, an inlet pipeline, and a cooling module; The storage tank includes a tank body and an outlet and an inlet provided on the tank body; the outlet and the inlet are used to test the outflow and return of the working fluid to the tank body, respectively. One end of the liquid outlet pipe is connected to the liquid outlet, and the other end is used to connect to the inlet; One end of the liquid inlet pipe is connected to the liquid inlet, and the other end is used to connect to the outlet; The cooling module is installed on the liquid inlet pipe and is used to cool the test working fluid discharged from the outlet.

[0006] The pump testing device of this invention forms a test circulation system that cools the test medium by means of a liquid storage tank, a liquid outlet pipe, a liquid inlet pipe, and a cooling module. This allows the pump testing device to use low-boiling-point working media that the pump actually operates to conduct tests, and the cooling module ensures the normal operating state of the test medium, thereby improving the accuracy and safety of pump performance testing.

[0007] In some specific embodiments, it also includes: The first pressure detection unit is installed on the outlet pipeline and is used to test the inlet pressure of the pump; The second pressure detection unit is installed on the liquid inlet pipe, located between the pump and the cooling module, and is used to test the outlet pressure of the pump; A flow detection unit is installed on the inlet pipe, located between the second pressure detection unit and the pump, and is used to detect the outlet flow of the pump.

[0008] The pump testing device in this embodiment sets a first pressure detection unit and a second pressure detection unit on the outlet pipeline and the inlet pipeline respectively, and obtains the pump head by the difference between the outlet pressure obtained by the first pressure detection unit and the inlet pressure obtained by the second pressure detection unit; that is, the pump head is tested by setting the first pressure detection unit and the second pressure detection unit; and the accuracy of flow rate testing is improved by setting the flow rate detection unit to detect the outlet flow rate of the pump under a certain outlet pressure.

[0009] In some specific embodiments, an adjustable flow valve is also included, which is disposed on the liquid inlet pipeline, located between the second pressure detection unit and the cooling module, for adjusting the outlet pressure and changing the outlet flow rate.

[0010] The pump testing device in this embodiment adjusts the opening of the adjustable flow valve and determines whether to increase or decrease the opening of the adjustable flow valve and the magnitude of increase or decrease by observing or obtaining the outlet pressure detected by the second pressure detection unit. This enables the testing of the flow rate of the pump under different outlet pressures, thereby obtaining the flow curve from the obtained flow rate under different outlet pressures, that is, obtaining the actual flow curve of the pump under different head.

[0011] In some specific embodiments, a filter is also included, which is disposed on the inlet line between the second pressure detection unit and the adjustable flow valve.

[0012] The pump testing device in this embodiment filters the circulating test medium through a filter, thereby improving the purity of the test medium, ensuring the testing environment, improving the stability and reliability of the pump testing device, and improving the accuracy of the test data.

[0013] In some specific embodiments, it also includes: A bypass pipeline, the two ends of which are respectively connected and communicated with the other end of the liquid outlet pipeline and one end of the liquid inlet pipeline; An unloading valve, which is installed on the bypass pipeline, is used to connect the bypass pipeline when the inlet pressure exceeds the outlet pressure and reaches the rated value of the unloading valve.

[0014] The pump testing device in this embodiment achieves direct connection between the pump inlet and outlet when the pressure difference is too large by setting a bypass pipeline and an unloading valve located on the bypass pipeline. This relieves the overload pressure between the inlet and outlet and circulates in the small system formed by the bypass pipeline and the pump, preventing excessive outlet pressure from damaging the pump when the components on the inlet pipeline become blocked, thus improving the safety of the test.

[0015] In some specific embodiments, it also includes: A first shut-off valve is installed on the liquid outlet pipeline, located between the first pressure detection unit and the liquid outlet, and is used to shut off the liquid outlet pipeline when the pump is replaced. The second shut-off valve is installed on the liquid inlet pipe, located between the cooling module and the liquid inlet, and is used to shut off the liquid inlet pipe when the pump is replaced.

[0016] The pump testing device in this embodiment achieves the isolation and switching of the outlet and inlet pipelines from the tank by setting a first shut-off valve and a second shut-off valve on the outside of the outlet and the outside of the inlet, respectively. When replacing the pump, the first shut-off valve and the second shut-off valve are closed to remove the pressure in the outlet pipeline connected to the inlet and the inlet pipeline connected to the outlet, so that the test medium does not flow out when it is open. This facilitates the replacement of the pump to be tested, reduces the waste of test medium and the pollution caused by the leakage of test medium.

[0017] In some specific embodiments, a third pressure detection unit is also included, which is disposed on the upper side of the liquid storage tank and is used to detect the gas pressure inside the liquid storage tank; The cooling module is a plate heat exchanger for a chiller; adjusting the cooling capacity of the cooling module is used to maintain the gas pressure within a set range and to test the lifespan of the pump.

[0018] The pump testing device in this embodiment uses a third pressure detection unit on the upper side of the storage tank to observe or obtain the pressure inside the storage tank, which guides the adjustment of the cooling amount of the cooling module, ensuring the pressure and liquid phase of the test working fluid inside the tank, and testing the service life of the pump.

[0019] In some specific embodiments, a liquid storage cylinder is also included, which includes a cylinder body, an adjustable power heater, a fourth pressure detection unit, and a first temperature detection unit; the cylinder body has a volume and is disposed on the liquid outlet pipeline, located between the first shut-off valve and the first pressure detection unit; the fourth pressure detection unit and the first temperature detection unit are used to detect the cylinder body pressure and cylinder body temperature; When the first shut-off valve and the second shut-off valve are open, the adjustable power heater is turned on to heat the test working fluid in the cylinder, causing it to vaporize into a gaseous medium. The cylinder pressure and cylinder temperature can be changed by adjusting the power of the adjustable power heater to keep the test working fluid in a two-phase state and test the pump's two-phase dry suction capability.

[0020] In this embodiment, when the first and second shut-off valves are open, the adjustable power heater is turned on to heat the test medium inside the cylinder, causing it to flash into a gaseous medium. The power of the adjustable power heater is adjusted to change the cylinder pressure and cylinder temperature, so that the test medium inside the cylinder remains in a two-phase state, and the pump's two-phase dry suction capability is tested.

[0021] In some specific embodiments, it also includes: The gas supply pipeline is connected and communicated at both ends with the liquid outlet pipeline between the upper side of the liquid storage tank and the first shut-off valve and the first pressure detection unit, respectively. The third shut-off valve is installed on the gas supply line; The second temperature detection unit is located on the upper side of the liquid storage tank and is used to test the gas temperature inside the liquid storage tank. When the first shut-off valve is closed and the second and third shut-off valves are open, the opening degree of the adjustable flow valve and the cooling capacity of the cooling module are adjusted to achieve the set values ​​of the gas pressure and the gas temperature, thereby meeting the conditions for testing the gaseous dry suction capability of the pump.

[0022] The pump testing device in this embodiment obtains gas pressure and gas temperature through a third pressure detection unit and a second temperature detection unit, and adjusts the cooling amount and flow rate through a cooling module and an adjustable flow valve to ensure that the gas pressure and gas temperature meet the superheat requirements. This allows the gas supply pipeline to provide a completely gaseous test medium, meeting the conditions for testing the pump's gaseous dry suction capacity. This enables the testing of the pump's complete gaseous dry suction capacity and solves the problem of insufficient dry suction capacity of factory-made pumps.

[0023] In some specific embodiments, a first sight glass, a second sight glass, and a third sight glass are respectively installed at the upper end, lower end, and front side of the liquid outlet pipeline of the liquid storage tank, for observing the liquid level of the test working medium in the liquid storage tank and the state of the test working medium in the liquid outlet pipeline.

[0024] The pump testing device in this embodiment uses a first sight glass, a second sight glass, and a third sight glass to observe the liquid level and the phase state of the test medium, ensuring a safe liquid level and a safe phase state, and improving the safety and reliability of pump testing.

[0025] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 2 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 3 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 4 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 5 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 6 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 7 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 8 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 9 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 10 This is a schematic diagram of the composition and connection structure of the pump testing apparatus according to an embodiment; Figure 11 This is a schematic diagram of the composition and connection structure of the pump testing device according to an embodiment.

[0028] Figure label, 1. Storage tank; 11. Inlet; 12. Outlet; 2. Pump; 3. Outlet pipeline; 4. Inlet pipeline; 5. Cooling module; 6. Filter; 7. Storage cylinder; 8. Gas supply pipeline; 9. Bypass pipeline; 10. Safety valve; S1, First shut-off valve; S2, Second shut-off valve; S3, Third shut-off valve; P1, First pressure detection unit; P2, Second pressure detection unit; P3, Third pressure detection unit; P4, Fourth pressure detection unit; F1, Flow detection unit; T1, First temperature detection unit; T2, Second temperature detection unit; EV, Adjustable flow valve; RV, Unloading valve; P, Differential pressure detection unit; SG1, First sight glass; SG2, Second sight glass; SG3, Third sight glass. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] A closed-loop pump is a pump that circulates a working fluid through a closed-loop pipeline, typically used in geothermal power generation and industrial waste heat recovery. It heats a low-boiling-point working fluid (such as isobutane, Freon, or a mixture of ammonia and water) in an evaporator, and the resulting steam drives a turbine to generate electricity. These systems usually employ a closed-loop structure to avoid working fluid leakage or scaling problems. Low-boiling-point working fluids (such as isobutane and Freon) require relatively low temperatures to achieve phase change during evaporation, making them suitable for use as low-temperature heat sources. Their circulation process involves multiple stages, including evaporation, condensation, and expansion, and is achieved through pump equipment.

[0036] The pump testing device of this invention is used to test the above-mentioned closed-loop pump using a low-boiling-point working fluid, thereby improving the accuracy and safety of pump testing.

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11Pump 2 includes an inlet and an outlet; the pump testing device includes a storage tank 1; the storage tank 1 includes a tank body and an outlet 12 and an inlet 11 provided on the tank body; the outlet 12 and the inlet 11 are used for the test working fluid to flow out and return to the tank body, respectively; usually the outlet 12 is located below the inlet 11; the test working fluid is a low boiling point working fluid.

[0038] The pump testing device also includes an outlet pipe 3 and an inlet pipe 4; one end of the outlet pipe 3 is connected to the outlet port 12, and the other end is used to connect to the inlet of the pump 2 to deliver the test medium to the pump 2; one end of the inlet pipe 4 is connected to the inlet port 11, and the other end is used to connect to the outlet of the pump 2 to return the test medium that has passed through the pump 2 to the tank.

[0039] The pump testing device also includes a cooling module 5, which is installed on the inlet pipe 4 to cool the test working medium discharged from the outlet, so that it changes to a liquid state and returns to the tank through the inlet 11.

[0040] The pump testing device of this utility model forms a test circulation system with cooling for the test working medium through a liquid storage tank 1, a liquid outlet pipe 3, a liquid inlet pipe 4, and a cooling module 5. This allows the pump testing device to use the low-boiling-point working medium that the pump 2 is actually working with for testing. Furthermore, the cooling of the cooling module 5 ensures the normal working state of the test working medium, thereby improving the accuracy and safety of the performance test of the pump 2.

[0041] The specific structure and principle of the pump testing device of this utility model will be described in detail below through specific embodiments.

[0042] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes a first pressure detection unit P1, which is installed on the outlet pipeline 3 and is used to test the inlet pressure of pump 2.

[0043] The pump testing device also includes a second pressure detection unit P2, which is installed on the liquid inlet pipe 4, located between the pump 2 and the cooling module 5, and is used to test the outlet pressure of the pump 2.

[0044] The pump testing device also includes a flow detection unit F1, which is installed on the inlet pipe 4, between the second pressure detection unit P2 and the pump 2, and is used to detect the outlet flow of the pump 2.

[0045] The pump testing device in this embodiment sets a first pressure detection unit P1 and a second pressure detection unit P2 on the outlet pipe 3 and the inlet pipe 4 respectively, and obtains the head of the pump 2 by the difference between the outlet pressure obtained by the first pressure detection unit P1 and the inlet pressure obtained by the second pressure detection unit P2; that is, the head of the pump 2 is tested by setting the first pressure detection unit P1 and the second pressure detection unit P2; and the flow detection unit F1 is set to detect the outlet flow rate of the pump 2 under a certain outlet pressure, thereby improving the accuracy of the flow rate test.

[0046] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes an adjustable flow valve EV, which is installed on the inlet pipe 4 and located between the second pressure detection unit P2 and the cooling module 5. It is used to adjust the flow rate of the inlet pipe 4, thereby adjusting the outlet pressure of the pump 2. The outlet pressure of the pump 2, in turn, affects the outlet flow rate of the pump, and is used to test the flow performance of the pump 2 under a certain outlet pressure.

[0047] The pump testing device in this embodiment adjusts the opening of the adjustable flow valve EV and determines whether the adjustable flow valve EV should be increased or decreased and the magnitude of increase or decrease by observing or obtaining the outlet pressure detected by the second pressure detection unit P2. This enables the testing of the flow rate of pump 2 under different outlet pressures, thereby obtaining the flow curve from the obtained flow rate under different outlet pressures, that is, obtaining the actual flow curve of pump 2 under different head.

[0048] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes a filter 6, which is installed on the inlet pipe 4, between the second pressure detection unit P2 and the adjustable flow valve EV. It is used to filter the test medium circulating in the pump testing device, improve the purity of the test medium, ensure the test environment, improve the stability and reliability of the pump testing device, and improve the accuracy of the test data.

[0049] In some specific embodiments, refer to Figure 5The pump testing device also includes a bypass pipeline 9 and an unloading valve RV; the two ends of the bypass pipeline 9 are connected to the other end of the outlet pipeline 3 and one end of the inlet pipeline 4, respectively; that is, the two ends of the bypass pipeline 9 are connected to the inlet and outlet of the pump 2, respectively; the unloading valve RV is installed on the bypass pipeline 9 and is used to connect the bypass pipeline 9 when the inlet pressure of the pump 2 exceeds the outlet pressure of the pump 2 and reaches the rated value of the unloading valve RV.

[0050] The pump testing device in this embodiment achieves direct connection between the inlet and outlet of pump 2 when the pressure difference is too large by setting a bypass pipeline 9 and an unloading valve RV located on the bypass pipeline 9. This relieves the overload pressure between the inlet and outlet and the small system circulation formed by the bypass pipeline 9 and pump 2, preventing excessive outlet pressure from damaging pump 2 when the components on the inlet pipeline 4 become blocked, thus improving the safety of the test.

[0051] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes a first shut-off valve S1, which is installed on the outlet pipeline 3, located between the first pressure detection unit P1 and the outlet 12, and is used to shut off the outlet pipeline 3 when replacing the pump 2. That is, one end of the first shut-off valve S1 is connected to the outlet 12, and the other end is connected to the inlet, and is used to close off the connection between the outlet 12 and the inlet when replacing the pump 2.

[0052] The pump testing device also includes a second shut-off valve S2, which is installed on the inlet pipe 4, located between the cooling module 5 and the inlet port 11, and is used to shut off the inlet pipe 4 when replacing the pump 2. That is, one end of the second shut-off valve S2 is connected to the inlet port 11, and the other end is connected to the outlet, and is used to close off the inlet port 11 and the outlet when replacing the pump 2.

[0053] The pump testing device in this embodiment achieves the switching between isolation and connection between the outlet pipe 3 and the inlet pipe 4 and the tank body by setting a first shut-off valve S1 and a second shut-off valve S2 on the outside of the outlet 12 and the inlet 11, respectively. When replacing the pump 2, the first shut-off valve S1 and the second shut-off valve S2 are closed to make the outlet pipe 3 connected to the inlet and the inlet pipe 4 connected to the outlet pressureless, so that the test medium does not flow out when it is open, which facilitates the replacement of the pump 2 to be tested, reduces the waste of test medium and the pollution caused by the leakage of test medium.

[0054] In some specific embodiments, refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes a third pressure detection unit P3, which is located on the upper side of the liquid storage tank 1 and is used to detect the gas pressure inside the liquid storage tank 1.

[0055] Cooling module 5 is a plate heat exchanger for a chiller; adjusting the cooling capacity of cooling module 5 keeps the gas pressure in storage tank 1 within a set range. The cooling capacity of cooling module 5 can be adjusted by regulating the cooling water flow.

[0056] The pump testing device in this embodiment uses a third pressure detection unit P3 set on the upper side of the liquid storage tank 1 to observe or obtain the pressure inside the liquid storage tank 1 to guide the adjustment of the cooling amount of the cooling module 5, so as to ensure the pressure and liquid phase of the test working fluid inside the tank and test the service life of the pump 2.

[0057] In some specific embodiments, refer to Figure 8 , Figure 10 The pump testing device also includes a liquid storage tank 7, which includes a long, straight cylinder and an adjustable power heater arranged around the cylinder.

[0058] The cylinder can temporarily store a certain amount of liquid test medium, which is set on the liquid outlet pipe 3 and located between the first shut-off valve S1 and the first pressure detection unit P1; that is, the two ends of the cylinder are respectively connected to the end of the first shut-off valve S1 away from the liquid outlet 12 and the inlet is connected through the liquid outlet pipe 3.

[0059] The adjustable power heater is used to heat the test medium inside the cylinder, causing it to flash into a gaseous state. Adjusting the power of the adjustable power heater adjusts the flash rate of the test medium, thereby adjusting the ratio of gaseous to liquid components in the gas-liquid mixture.

[0060] The liquid storage cylinder 7 also includes a fourth pressure detection unit P4 and a first temperature detection unit T1, which are respectively installed on the cylinder body or inside the cylinder body, and are used to detect the pressure and temperature inside the cylinder body, respectively denoted as cylinder body pressure and cylinder body temperature.

[0061] In this embodiment, when the first shut-off valve S1 and the second shut-off valve S2 are opened, the adjustable power heater is turned on to heat the test medium inside the cylinder, causing it to flash into a gaseous medium. The power of the adjustable power heater is adjusted to change the cylinder pressure and cylinder temperature, so that the test medium inside the cylinder remains in a two-phase state, and the two-phase dry suction capacity of pump 2 is tested.

[0062] The dry suction capacity of pump 2 refers to its ability to expel the air it draws in and create a sufficient vacuum to draw in liquid under conditions of no liquid pre-charge. Specifically, the dry suction capacity in two-phase states is determined by the flow rate detected by the flow detection unit F1 when the inlet is a two-phase test medium.

[0063] In some specific embodiments, refer to Figure 9 , Figure 10 The pump testing device also includes an air supply pipeline 8, a third shut-off valve S3, and a second temperature detection unit T2.

[0064] Both ends of the gas supply line 8 are connected to the upper side of the liquid storage tank 1 and the liquid outlet line 3 between the first shut-off valve S1 and the first pressure detection unit P1, respectively; that is, one end of the gas supply line 8 is connected to the upper side of the liquid storage tank 1 and connects to the internal space of the tank, and the other end is connected to the end of the first shut-off valve S1 away from the liquid outlet 12 through the liquid outlet line 3.

[0065] The third shut-off valve S3 is installed on the gas supply line 8 and is used to control the connection or disconnection of the gas supply line 8.

[0066] The second temperature detection unit T2 is located on the upper side of the liquid storage tank 1 and is used to detect the gas temperature inside the liquid storage tank 1.

[0067] When the first shut-off valve S1 is closed and the second shut-off valve S2 and the third shut-off valve S3 are open, the opening degree of the adjustable flow valve EV and the cooling amount of the cooling module 5 are adjusted to make the gas pressure and gas temperature reach the set values, so that the space on the upper side of the tank meets the superheat requirements, and the test working medium is provided by the gas supply pipeline 8.

[0068] The pump testing device in this embodiment obtains gas pressure and gas temperature through the third pressure detection unit P3 and the second temperature detection unit T2, and adjusts the cooling amount and flow rate through the cooling module 5 and the adjustable flow valve EV to make the gas pressure and gas temperature meet the superheat requirements, so that the gas supply pipeline 8 provides a completely gaseous test medium, and meets the conditions for testing the gaseous dry suction capacity of pump 2, thereby realizing the test of the complete gaseous dry suction capacity of pump 2 and solving the problem of insufficient dry suction capacity of pump 2 at the factory.

[0069] In some specific embodiments, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11The pump testing device also includes a first sight glass SG1, a second sight glass SG2, and a third sight glass SG3, which are respectively installed at the high liquid level at the upper end of the storage tank 1, the low liquid level at the lower end, and the outlet pipe 3, and are used to observe the high and low liquid levels of the test medium in the storage tank 1 and the state of the test medium in the outlet pipe 3.

[0070] The pump testing device in this embodiment uses a first sight glass SG1, a second sight glass SG2, and a third sight glass SG3 to observe the liquid level and the phase state of the test medium, ensuring a safe liquid level and a safe phase state, and improving the safety and reliability of the pump 2 test.

[0071] In some specific embodiments, refer to Figure 11 The pump testing device also includes a differential pressure detection unit P, which is connected in parallel with the filter 6 to detect the pressure difference across the filter 6. Based on the differential pressure value detected by the differential pressure detection unit P, it is determined whether the filter 6 is clogged, so as to facilitate timely replacement of the filter 6 and ensure the safety, reliability and accuracy of the test.

[0072] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The pump testing device also includes a safety valve 10, which is located on the upper side of the storage tank 1 to prevent excessive pressure inside the tank and improve the safety of the storage tank 1.

[0073] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0074] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pump testing device, wherein the pump includes an inlet and an outlet, characterized in that, include: A liquid storage tank, comprising a tank body and an outlet and an inlet disposed on the tank body; The liquid outlet and the liquid inlet are used to test the outflow and return of the working fluid to the tank, respectively. The liquid outlet pipeline has one end connected to the liquid outlet and the other end connected to the inlet; The liquid inlet pipe has one end connected to the liquid inlet and the other end connected to the outlet. A cooling module, which is installed on the inlet pipe, is used to cool the test working fluid discharged from the outlet.

2. The pump testing device according to claim 1, characterized in that, Also includes: The first pressure detection unit is installed on the outlet pipeline and is used to test the inlet pressure of the pump; The second pressure detection unit is installed on the liquid inlet pipe, located between the pump and the cooling module, and is used to test the outlet pressure of the pump; A flow detection unit is installed on the inlet pipe, located between the second pressure detection unit and the pump, and is used to detect the outlet flow of the pump.

3. The pump testing device according to claim 2, characterized in that, It also includes an adjustable flow valve, which is installed on the liquid inlet pipeline, located between the second pressure detection unit and the cooling module, for adjusting the outlet pressure and changing the outlet flow rate.

4. The pump testing device according to claim 3, characterized in that, It also includes a filter, which is disposed on the inlet line, located between the second pressure detection unit and the adjustable flow valve.

5. The pump testing device according to claim 3, characterized in that, Also includes: A bypass pipeline, the two ends of which are respectively connected and communicated with the other end of the liquid outlet pipeline and one end of the liquid inlet pipeline; An unloading valve, which is installed on the bypass pipeline, is used to connect the bypass pipeline when the inlet pressure exceeds the outlet pressure and reaches the rated value of the unloading valve.

6. The pump testing device according to claim 3, characterized in that, Also includes: A first shut-off valve is installed on the liquid outlet pipeline, located between the first pressure detection unit and the liquid outlet, and is used to shut off the liquid outlet pipeline when the pump is replaced. The second shut-off valve is installed on the liquid inlet pipe, located between the cooling module and the liquid inlet, and is used to shut off the liquid inlet pipe when the pump is replaced.

7. The pump testing device according to claim 6, characterized in that, It also includes a third pressure detection unit, which is located on the upper side of the liquid storage tank and is used to detect the gas pressure inside the liquid storage tank; The cooling module is a plate heat exchanger for a chiller; adjusting the cooling capacity of the cooling module is used to maintain the gas pressure within a set range and to test the lifespan of the pump.

8. The pump testing device according to claim 6, characterized in that, It also includes a liquid storage tank, which includes a cylinder body, an adjustable power heater, a fourth pressure detection unit, and a first temperature detection unit; the cylinder body has a volume and is disposed on the liquid outlet pipeline, located between the first shut-off valve and the first pressure detection unit; the fourth pressure detection unit and the first temperature detection unit are used to detect the cylinder body pressure and cylinder body temperature. When the first shut-off valve and the second shut-off valve are open, the adjustable power heater is turned on to heat the test working fluid in the cylinder, causing it to vaporize into a gaseous medium. The cylinder pressure and cylinder temperature can be changed by adjusting the power of the adjustable power heater to keep the test working fluid in a two-phase state and test the pump's two-phase dry suction capability.

9. The pump testing apparatus according to claim 7 or 8, characterized in that, Also includes: The gas supply pipeline is connected and communicated at both ends with the liquid outlet pipeline between the upper side of the liquid storage tank and the first shut-off valve and the first pressure detection unit, respectively. The third shut-off valve is installed on the gas supply line; The second temperature detection unit is located on the upper side of the liquid storage tank and is used to test the gas temperature inside the liquid storage tank. When the first shut-off valve is closed and the second and third shut-off valves are open, the opening degree of the adjustable flow valve and the cooling capacity of the cooling module are adjusted to achieve the set values ​​of the gas pressure and the gas temperature, thereby meeting the conditions for testing the gaseous dry suction capability of the pump.

10. The pump testing apparatus according to claim 9, characterized in that, A first sight glass, a second sight glass, and a third sight glass are respectively installed on the liquid outlet pipe at the upper end, lower end, and front side of the first pressure detection unit of the liquid storage tank, for observing the liquid level of the test working medium in the liquid storage tank and the state of the test working medium in the liquid outlet pipe.

Images