CN112763206B - Refrigerant valve leakage test system - Google Patents
Refrigerant valve leakage test system Download PDFInfo
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- CN112763206B CN112763206B CN202011611158.4A CN202011611158A CN112763206B CN 112763206 B CN112763206 B CN 112763206B CN 202011611158 A CN202011611158 A CN 202011611158A CN 112763206 B CN112763206 B CN 112763206B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
Abstract
The invention innovatively provides a refrigerant valve leakage test system which comprises a first constant temperature box, a refrigerant tank, a second constant temperature box, a refrigerant valve to be tested and a weighing environment box, wherein a temperature sensor is arranged on the refrigerant tank, a first pipeline communicated with the second constant temperature box is arranged at the bottom of the refrigerant tank, a second pipeline communicated with the second constant temperature box is arranged at the top of the refrigerant tank, a first stop valve, a first pressure sensor and a second stop valve are arranged on the first pipeline, a third stop valve, a second pressure sensor and a fourth stop valve are arranged on the second pipeline, a third pipeline communicated with the refrigerant valve to be tested is arranged on the second constant temperature box, a fourth pipeline communicated with the weighing environment box is arranged on the refrigerant valve to be tested, and the refrigerant valve leakage test system further comprises a temperature detection module, a first pressure detection module, a second pressure detection module, a pressure detection module, A calculation module and a control module; the invention has the advantage of simulating a system for high-precision detection of the refrigerant valve in an actual environment.
Description
Technical Field
The invention relates to the technical field of refrigerant valve testing, in particular to a refrigerant valve leakage testing system.
Background
The refrigerant valve refers to regulation and control of refrigerant flow according to indoor temperature, so that control of the indoor temperature is achieved, the application field of the refrigerant valve is continuously expanded, the refrigerant valve is widely applied to household and industry, along with increasing of policy supporting strength of new energy automobiles, the refrigerant valve applied to the new energy automobiles is relatively common, the quality requirement of the valve used for controlling the temperature in the automobile is relatively strict as the new energy automobiles, high quality of automobile internal parts can drive the industry of the new energy automobiles, performance airtightness detection of the refrigerant valve is particularly important, a manufacturer does not have detection equipment specially aiming at the refrigerant valve at present, and existing detection is that gas tightness is directly filled into the refrigerant valve to detect the performance of the refrigerant valve, so that high-precision airtightness detection of the refrigerant valve in an automobile using environment cannot be achieved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system capable of detecting the internal leakage of a refrigerant valve with high precision, which is used for overcoming the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a refrigerant valve leakage test system comprises a first thermostat, a refrigerant tank, a second thermostat, a refrigerant valve to be tested and a weighing environment box, wherein the refrigerant tank is positioned in the first thermostat, refrigerant medium is stored in the refrigerant tank, a temperature sensor is arranged on the refrigerant tank, a first pipeline communicated with the second thermostat is arranged at the bottom of the refrigerant tank, a second pipeline communicated with the second thermostat is arranged at the top of the refrigerant tank, a first stop valve, a first pressure sensor and a second stop valve are arranged on the first pipeline, the liquid refrigerant in the refrigerant tank sequentially passes through the first stop valve, the first pressure sensor and the second stop valve, a third stop valve, a second pressure sensor and a fourth stop valve are arranged on the second pipeline, the gaseous refrigerant in the refrigerant tank sequentially passes through the third stop valve, the second pressure sensor and the fourth stop valve, a third pipeline communicated with a refrigerant valve to be measured is arranged on the second constant temperature box, a fourth pipeline communicated with a weighing environment box is arranged on the refrigerant valve to be measured, a weighing platform and a collecting tank are arranged in the weighing environment box, the collecting tank is positioned on the weighing platform, and the collecting tank is connected to the fourth pipeline;
the refrigerant valve leakage test system also comprises a temperature detection module, a first pressure detection module, a second pressure detection module, a calculation module and a control module;
the temperature detection module acquires the temperature value in the refrigerant tank detected by the temperature sensor as the temperature information of the refrigerant tank; comparing the temperature information of the refrigerant tank with a preset temperature information range value, and if the temperature information of the refrigerant tank is within the preset temperature information range value, sending opening command information by the temperature detection module;
the first pressure detection module acquires opening command information in the temperature detection module, opens the first stop valve, closes the second stop valve, the third stop valve and the fourth stop valve, acquires a pressure value in the first pipeline detected by the first pressure sensor as first pressure information, comparing the first pressure information with a preset pressure information range, if the first pressure information is larger than the maximum value of the preset pressure information range, closing the second stop valve all the time, the first pressure intensity detection module sends out first temperature reduction information, if the first pressure intensity information is smaller than the minimum value of the preset pressure intensity information range, the second stop valve is always closed, the first pressure intensity detection module sends out first temperature rise information, if the first pressure intensity information is in a preset pressure intensity information range, the second stop valve is opened, and the first pressure detection module sends out first weighing command information;
the second pressure detection module acquires opening command information in the temperature detection module, opens the third stop valve, closes the first stop valve, the second stop valve and the fourth stop valve, acquires a pressure value in the second pipeline detected by the second pressure sensor as second pressure information, compares the second pressure information with a preset pressure information range, if the second pressure information is larger than the maximum value of the preset pressure information range, the fourth stop valve is always closed, the second pressure detection module sends second cooling information, if the second pressure information is smaller than the minimum value of the preset pressure information range, the fourth stop valve is always closed, the second pressure detection module sends second heating information, and if the second pressure information is in the preset pressure information range, the fourth stop valve is opened; the second pressure intensity detection module sends out second weighing command information;
the control module sends a cooling command to enable the first constant temperature box to start cooling when first cooling information in the first pressure detection module or second cooling information in the second pressure detection module is acquired, sends a heating command to enable the first constant temperature box to start heating when first heating information in the first pressure detection module or second heating information in the second pressure detection module is acquired, and sends calculation command information when first weighing command information in the first pressure detection module or second weighing command information in the second pressure detection module is acquired;
the calculation module acquires the weight of an initial collecting tank on the weighing platform as first weight information, acquires calculation command information in the control module, acquires the weight of the collecting tank on the weighing platform after collection as second weight information, and judges whether the refrigerant valve to be detected leaks or not according to comparison between the second weight information and the first weight information.
Furthermore, a first electromagnetic valve is arranged on the first pipeline and is positioned between the first pressure sensor and the second stop valve, the second pipeline is provided with a second electromagnetic valve which is positioned between a second pressure sensor and a fourth stop valve, the first pressure detection module converts the first pressure information into first temperature information, calculating a difference value according to the first temperature information and the refrigerant tank temperature information to serve as first difference value information, acquiring the first difference value information by a control module to control working power of a first electromagnetic valve on a circulation loop, converting second pressure intensity information into second temperature information by a second pressure intensity detection module, and calculating a difference value according to the second temperature information and the refrigerant tank temperature information to serve as second difference value information, and acquiring the second difference value information by the control module to control the working power of a second electromagnetic valve on the circulation loop.
Further, still be equipped with pressure differential testing arrangement on the third pipeline, pressure differential testing arrangement includes evacuation pipe, first pressure differential test pipe and second pressure differential test pipe, evacuation pipe and third pipeline communicate with each other, first pressure differential test union coupling is on evacuation pipe and both communicate with each other, be equipped with the fifth stop valve on the evacuation pipe, be equipped with sixth stop valve, first relief pressure valve, second relief pressure valve, third pressure sensor, third solenoid valve and the first station that awaits measuring on the first pressure differential test pipe in proper order, second pressure differential test union coupling is on the first pressure differential test pipe between first relief pressure valve and second relief pressure valve and both communicate with each other, still be equipped with fourth pressure sensor, fourth solenoid valve and the second station that awaits measuring on the second pressure differential test pipe in proper order.
Furthermore, the fourth pipeline is in threaded connection with the refrigerant valve to be detected, and internal threads on the fourth pipeline are taper threads.
Furthermore, the first thermostat comprises a box body, a support and a first heating wire, wherein the support and the first heating wire are located in the box body, a constant temperature medium is arranged in the box body, the refrigerant tank is located on the support, and the first heating wire is wound on the outer ring of the refrigerant tank.
Further, the second thermostated container includes the shell and is located cold and hot pipe, second heating wire and the water-cooled tube of shell, the one end of cold and hot pipe communicates with each other with first pipeline and second pipeline respectively, the other end and the third pipeline of cold and hot pipe communicate with each other, the constant temperature medium is equipped with in the shell, second heating wire and water-cooled tube are all around establishing on cold and hot pipe, an upper end lateral wall of shell is equipped with the delivery port, be equipped with the water inlet on the lower extreme lateral wall of shell, the both ends of water-cooled tube set up respectively on water inlet and delivery port, the external pipe that is equipped with of box, the both ends of external pipe are connected with water inlet and delivery port respectively, the water-cooled tube communicates with each other with external pipe and constitutes a cooling pipeline, be equipped with the force pump on the external pipe.
Further, still be equipped with liquid level switch and relief valve on the refrigerant jar, still be equipped with respectively on first pipeline and the third pipeline and look the liquid mirror, still be equipped with the inlet pipe on the second pipeline, be equipped with the seventh stop valve on the inlet pipe, all be equipped with the vacuum pump on the third pipeline of inlet pipe, the refrigerant valve both sides that await measuring and the fourth pipeline.
Further, the predetermined pressure information range is between 0.1MPa and 2.8 MPa.
The invention has the beneficial effects that: the temperature sensor is used for detecting the temperature in the refrigerant tank to convert the corresponding pressure intensity in the refrigerant tank, when the specified pressure intensity is reached, the first stop valve below or the third stop valve above can be automatically selected to open to realize the selection of the gas state or the liquid state of the refrigerant medium, when the liquid refrigerant medium is selected for detection, the first pressure sensor is used for detecting whether the pressure intensity of the liquid refrigerant medium entering the first pipeline reaches the specified pressure intensity range, when the gaseous refrigerant medium is selected for detection, the second pressure sensor is used for detecting whether the pressure intensity of the gaseous refrigerant medium entering the second pipeline reaches the specified pressure intensity range, and the second constant temperature box is used for carrying out corresponding overheating or supercooling on the selected gaseous refrigerant medium or the liquid refrigerant medium, so that the gaseous refrigerant medium is completely gaseous or the liquid refrigerant medium is completely liquid, finally, environmental simulation before testing is realized, so that the pressure and the temperature of the test are the same as those of the actual environment, and the testing accuracy of the refrigerant valve to be tested is improved.
Drawings
FIG. 1 is an overall system diagram of the present invention;
FIG. 2 is a control relationship diagram in the present invention;
FIG. 3 is a structural view of a first incubator in the present invention;
fig. 4 is a structural view of a second oven in the present invention.
Reference numerals: 1. a first incubator; 111. a support; 112. a first heating wire; 2. a refrigerant tank; 3. a second incubator; 301. a cold and hot pipe; 302. a second heating wire; 303. a water-cooled tube; 304. an external pipe; 305. a pressure pump; 4. a refrigerant valve to be tested; 5. weighing an environment box; 51. a weighing platform; 52. a collection tank; 6. a temperature sensor; 7. a first conduit; 8. a second conduit; 9. a first shut-off valve; 10. a first pressure sensor; 11. a second stop valve; 12. a third stop valve; 13. a second pressure sensor; 14. a fourth stop valve; 15. a third pipeline; 16. a fourth conduit; 17. a first solenoid valve; 18. a second solenoid valve; 19. emptying the pipe; 20. a first differential pressure test tube; 21. a second differential pressure test tube; 22. a fifth stop valve; 23. a sixth stop valve; 24. a first pressure reducing valve; 25. a second pressure reducing valve; 26. a third pressure sensor; 27. a third electromagnetic valve; 28. a first station to be tested; 29. a fourth pressure sensor; 30. a fourth solenoid valve; 31. a second station to be tested; 101. a temperature detection module; 102. a first pressure detection module; 103. a second pressure detection module; 104. a control module; 105. and a calculation module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:
because the current manufacturer does not have detection equipment specially aiming at the refrigerant valve, the existing detection is to directly fill gas into the refrigerant valve to detect the air tightness, so that the high-precision air tightness detection of the refrigerant valve in the automobile using environment cannot be realized; therefore, the invention designs a refrigerant valve leakage test system, the specific structure of which is shown in fig. 1-2, and the system comprises a first thermostat 1, a refrigerant tank 2, a second thermostat 3, a refrigerant valve 4 to be tested and a weighing environment box 5, wherein the refrigerant tank 2 is positioned in the first thermostat 1 (as shown in fig. 3, the first thermostat 1 comprises a box body, a support 111 and a first heating wire 112 which are positioned in the box body, a constant temperature medium is filled in the box body, the refrigerant tank 2 is positioned on the support 111, and the first heating wire 112 is wound on the outer ring of the refrigerant tank 2. the system heats silicon oil in the box body by the heating of the first heating wire 112, the first heating wire 112 is wound on the outer surface of the refrigerant tank 2 and has the function of uniformly heating the silicon oil in the box), the refrigerant tank 2 stores a refrigerant medium (the refrigerant medium in the invention is silicon oil), the tank 2 is provided with a temperature sensor 6, a first pipeline 7 communicated with the second thermostat 3 is arranged at the bottom of the refrigerant tank 2, a second pipeline 8 communicated with the second thermostat 3 is arranged at the top of the refrigerant tank 2, a first stop valve 9, a first pressure sensor 10 and a second stop valve 11 are arranged on the first pipeline 7, liquid refrigerant in the refrigerant tank 2 sequentially passes through the first stop valve 9, the first pressure sensor 10 and the second stop valve 11, a third stop valve 12, a second pressure sensor 13 and a fourth stop valve 14 are arranged on the second pipeline 8, gaseous refrigerant in the refrigerant tank 2 sequentially passes through the third stop valve 12, the second pressure sensor 13 and the fourth stop valve 14, and a third pipeline 15 communicated with the refrigerant valve 4 to be detected is arranged on the second thermostat 3 (as shown in fig. 4, since the liquid refrigerant and the gaseous refrigerant respectively need to be supercooled and thermally treated, when the liquid refrigerant is filled into the refrigerant valve 4 to be detected, it is ensured that part of the gaseous refrigerant is completely liquefied into liquid refrigerant A refrigerant medium, and when the refrigerant valve 4 to be measured is filled with the gaseous refrigerant medium, it is ensured that part of the liquid refrigerant medium is completely gasified into the gaseous refrigerant medium, therefore, the second thermostat 3 comprises an outer shell, a cold-hot pipe 301, a second heating wire 302 and a water-cooling pipe 303 which are positioned in the outer shell, one end of the cold-hot pipe 301 is respectively communicated with the first pipeline 7 and the second pipeline 8, the other end of the cold-hot pipe 301 is communicated with the third pipeline 15, the constant temperature medium is filled in the outer shell, the constant temperature medium is also silicon oil, the second heating wire 302 and the water-cooling pipe 303 are wound on the cold-hot pipe 301, one side wall of the upper end of the outer shell is provided with a water outlet, one side wall of the lower end of the outer shell is provided with a water inlet, two ends of the water-cooling pipe 303 are respectively arranged on the water inlet and the water outlet, an external pipe 304 is arranged outside the box body, two ends of the external pipe 304 are respectively connected with the water inlet and the water outlet, the water-cooling pipe 303 is communicated with the external pipe 304 to form a cooling pipeline, the external pipe 304 is provided with a pressure pump 305, the second thermostat 3 needs to realize the real-time switching of two states of overheating and supercooling, so that overheating only needs to heat the second heating wire 302 to transfer heat to silicon oil, the cold and hot pipe 301 is located in the silicon oil, so that heat can be finally transferred to the cold and hot pipe 301 to realize the purpose of overheating, supercooling only needs to close the second heating wire 302 for heating, a water pump is opened to enable cooling water to continuously flow in the cooling pipe and the external pipe 304 to cool the silicon oil, if the temperature range needing supercooling is large, a semiconductor refrigerating sheet can be arranged on the external pipe 304 to cool the cooling water, the fourth pipeline 16 communicated with the weighing environment box 5 is arranged on the refrigerant valve 4 to be detected, the weighing environment box 5 comprises a weighing platform 51 and a collecting tank 52, the collecting tank 52 is located on the weighing platform 51, and the collecting tank 52 is connected to the fourth pipeline 16; the refrigerant tank 2 is also provided with a liquid level switch and a safety valve, the first pipeline 7 and the third pipeline 15 are respectively provided with a liquid viewing mirror, the second pipeline 8 is also provided with a feed pipe, the feed pipe is provided with a seventh stop valve, the feed pipe, the third pipeline 15 and the fourth pipeline 16 on two sides of the refrigerant valve 4 to be detected are both provided with vacuum pumps (the feed pipes are pipelines for supplementing the refrigerant medium in the refrigerant tank 2, when the refrigerant medium is needed to be supplemented, the seventh stop valve is opened, in an initial state, the vacuum pumps can evacuate air in the refrigerant tank 2 to ensure that the refrigerant tank 2 is in a vacuum state, then the refrigerant can be supplemented, the seventh stop valve is closed after the supplement is completed, the vacuum pump on the third pipeline 15 on the left side of the refrigerant valve 4 to be detected is used for evacuating the gas refrigerant medium in the refrigerant valve 4 to be detected and a part of the third pipeline 15 to be detected, so as to avoid influencing subsequent detection, the vacuum pump on the fourth pipeline 16 on the right side of the refrigerant valve 4 to be detected has the function that when the leakage is detected, and then the refrigerant valve 4 to be detected is detected, the refrigerant medium in the collecting tank 52 needs to be pumped out for the next detection).
As shown in fig. 2, the refrigerant valve leakage test system further includes a temperature detection module 101, a first pressure detection module 102, a second pressure detection module 103, a calculation module 105, and a control module 104;
the temperature detection module 101 is used for acquiring the temperature value in the refrigerant tank 2 detected by the temperature sensor 6 as the temperature information of the refrigerant tank 2; according to the method, the temperature information of the refrigerant tank 2 is compared with a preset temperature information range value, the temperature in the refrigerant tank 2 and the pressure inside the refrigerant tank 2 are in a direct proportion relation, the temperature in the refrigerant tank 2 can be obtained according to a common refrigerant saturation temperature pressure comparison table, the preset pressure information range is within +/-0.1 MPa of 0.1-2.8 MPa during detection, if the temperature information of the refrigerant tank 2 is within the preset temperature information range value, the temperature detection module 101 sends out opening command information, if the temperature information in the refrigerant tank 2 is smaller than the preset temperature information minimum value, the first constant temperature box 1 continues to be heated, and if the temperature information in the refrigerant tank 2 is larger than the preset temperature information maximum value, the first constant temperature box 1 is cooled;
a first pressure detection module 102 that acquires the open command information in the temperature detection module 101, opens the first cutoff valve 9, closes the second cutoff valve 11, the third cutoff valve 12, and the fourth cutoff valve 14, acquires the pressure value in the first pipe 7 detected by the first pressure sensor 10 as first pressure information, comparing the first pressure information with a predetermined pressure information range, if the first pressure information is larger than the maximum value of the predetermined pressure information range, the second stop valve 11 is always closed, the first pressure detection module 102 sends out the first temperature reduction information, if the first pressure information is smaller than the minimum value of the predetermined pressure information range, the second stop valve 11 is always closed, the first pressure detection module 102 sends out first temperature rise information, if the first pressure information is within a predetermined pressure information range, the second stop valve 11 is opened, and the first pressure detection module 102 sends out first weighing command information;
the second pressure detection module 103 is configured to obtain opening command information in the temperature detection module 101, open the third stop valve 12, close the first stop valve 9, the second stop valve 11, and the fourth stop valve 14, obtain a pressure value in the second pipeline 8 detected by the second pressure sensor 13 as second pressure information, compare the second pressure information with a predetermined pressure information range, if the second pressure information is greater than a maximum value of the predetermined pressure information range, the fourth stop valve 14 is always closed, the second pressure detection module 103 sends second temperature reduction information, if the second pressure information is less than a minimum value of the predetermined pressure information range, the fourth stop valve 14 is always closed, the second pressure detection module 103 sends second temperature increase information, and if the second pressure information is within the predetermined pressure information range, the fourth stop valve 14 is opened; the second pressure detection module 103 sends out second weighing command information;
a control module 104, configured to, when first temperature reduction information in the first pressure detection module 102 is acquired or second temperature reduction information in the second pressure detection module 103 is acquired, send a temperature reduction command by the control module 104 to start temperature reduction of the first incubator 1, when first temperature increase information in the first pressure detection module 102 is acquired or second temperature increase information in the second pressure detection module 103 is acquired, send a temperature increase command by the control module 104 to start temperature increase of the first incubator 1, and when first weighing command information in the first pressure detection module 102 is acquired or second weighing command information in the second pressure detection module 103 is acquired, send calculation command information by the control module 104;
the calculating module 105 obtains the weight of the initial collecting tank 52 on the weighing platform 51 as first weight information, obtains calculating command information in the control module 104, obtains the weight collected by the collecting tank 52 on the weighing platform 51 as second weight information, and compares the second weight information with the first weight information to determine whether the refrigerant valve 4 to be measured leaks.
The temperature sensor 6 is used for detecting the temperature in the refrigerant tank 2 to convert the corresponding pressure intensity in the refrigerant tank 2, when the specified pressure intensity is reached, the lower first stop valve 9 or the upper third stop valve 12 can be automatically selected to open to realize the selection of the gas state or the liquid state of the refrigerant medium, when the liquid refrigerant medium is selected for detection, the first pressure sensor 10 is used for detecting whether the pressure intensity of the liquid refrigerant medium entering the first pipeline 7 reaches the specified pressure intensity range, when the gaseous refrigerant medium is selected for detection, the second pressure sensor 13 is used for detecting whether the pressure intensity of the gaseous refrigerant medium entering the second pipeline 8 reaches the specified pressure intensity range, and the second thermostat 3 is used for carrying out corresponding overheating or supercooling on the selected gaseous refrigerant medium or the liquid refrigerant medium to ensure that the gaseous refrigerant medium is completely gaseous or the liquid refrigerant medium is completely liquid, finally, the environmental simulation before the test is realized, so that the pressure and the temperature of the test are the same as those of the actual environment, and the test accuracy of the refrigerant valve 4 to be tested is improved.
As shown in fig. 1, the first pipeline 7 is provided with two first solenoid valves 17 (two first solenoid valves 17 in the present invention), two first solenoid valves 17 are located between the first pressure sensor 10 and the second stop valve 11, the second pipeline 8 is provided with two second solenoid valves 18 (two first solenoid valves 17 in the present invention), the second solenoid valves 18 are located between the second pressure sensor 13 and the fourth stop valve 14, the first pressure detection module 102 converts the first pressure information into first temperature information, calculates a difference value as first difference value information according to the first temperature information and the temperature information of the refrigerant tank 2, the control module 104 obtains the first difference value information to control the working power of the first solenoid valves 17 on the circulation loop (when the first pressure information is not within a predetermined pressure information range, one of the first solenoid valves 17 opens the circulation loop pipe, so that part of the liquid refrigerant medium flowing out flows back into the refrigerant tank 2 to continue to be heated or cooled, and the power of the first solenoid valve 17 can be controlled according to the first difference information so as to adjust the reflux rate of the liquid refrigerant medium), the second pressure detection module 103 converts the second pressure information into second temperature information, a difference value is calculated according to the second temperature information and the temperature information of the refrigerant tank 2 to serve as second difference information, and the control module 104 obtains the second difference information so as to control the working power of a second solenoid valve 18 on the circulation loop (when the second pressure information is not within a preset pressure information range, one of the second solenoid valves 18 opens the circulation loop pipe, so that part of the gaseous refrigerant medium flowing out flows back into the refrigerant tank 2 to be continuously heated or cooled, and the power of the second solenoid valve 18 can be controlled according to the second difference information so as to adjust the reflux rate of the gaseous refrigerant medium).
The fourth pipeline 16 is in threaded connection with the refrigerant valve 4 to be detected, the internal thread on the fourth pipeline 16 is a taper thread, one end of the refrigerant valve 4 to be detected is provided with a connecting pipe, the fourth pipeline 16 is in threaded connection with the connecting pipe, and the internal thread of the fourth pipeline 16 is a taper thread, so that the external thread of the connecting pipe is also a taper thread matched with the internal thread of the fourth pipeline 16, and the connection of the taper thread is higher in sealing performance compared with common threaded connection.
The leakage detection principle is as follows: firstly, on the premise of detecting a refrigerant valve 4 to be detected, the temperature of a gaseous refrigerant medium or a liquid refrigerant medium needs to be controlled firstly, the temperature is controlled to reach the preset pressure of 0.1MPa-2.8MPa +/-0.1 MPa, then the thermal transition or the cold transition treatment (10 +/-1 degrees for thermal transition and 5 +/-1 degrees for cold transition) is realized through a second constant temperature box 3, then the refrigerant medium does not exist in a refrigerant tank 2 during detection in an initial state, firstly, a seventh stop valve is opened, a vacuum pump exhausts the air in the refrigerant tank 2 through a feed pipe, the refrigerant medium is filled into the refrigerant tank 2 through the feed pipe, and the seventh stop valve is closed when the proper position of a liquid level switch is observed; secondly, controlling the first thermostat 1 to start heating, improving the temperature of silicon oil in the first thermostat 1, detecting the temperature in the refrigerant tank 2 by the temperature sensor 6, obtaining a highest temperature value and a lowest temperature value according to the ratio of the temperature and the pressure, and when the temperature in the refrigerant tank 2 reaches a specified range, enabling the refrigerant medium in the refrigerant tank 2 to be in a gas state and a liquid state, wherein the gas state is located at the upper part of the refrigerant tank 2, and the liquid state is located at the lower part of the refrigerant tank 2; thirdly, gas detection or liquid detection is freely selected, when liquid detection is selected, the first stop valve 9 is opened, the liquid refrigerant medium flows into the first pipeline 7 to the first pressure sensor, the first pressure sensor can detect the pressure intensity of the liquid refrigerant medium at the moment, comparison is carried out between the pressure intensity and a preset pressure intensity range, when the actual pressure intensity is smaller than the preset pressure intensity range, the liquid refrigerant medium flowing into the first pipeline 7 can circularly flow back into the refrigerant tank 2, the first constant temperature box 1 can continue to be heated, on the contrary, when the actual pressure intensity is larger than the preset pressure intensity range, the first constant temperature box 1 can stop heating until the actual pressure intensity is within the preset pressure intensity range, namely, the second stop valve 11 on one side can be opened, the liquid refrigerant medium enters the second constant temperature box 3 to be subjected to supercooling treatment after reaching the specified pressure intensity, and the water cooling in the second constant temperature box 3 can cool the liquid refrigerant medium in the cold and heat pipe 301, ensuring that part of the gaseous refrigerant medium is completely liquefied into liquid refrigerant medium under the condition of temperature reduction; and fourthly, opening a stop valve on the third pipeline 15, and detecting that the supercooled liquid refrigerant medium flows into the refrigerant valve 4 to be detected, wherein if the weight of the collecting tank 52 is increased, the leakage phenomenon of the refrigerant valve 4 to be detected is indicated. For the third step, if gas detection is selected, the third stop valve 12 is opened, the gas refrigerant medium flows into the second pipeline 8 to the second pressure sensor, the second pressure sensor detects the pressure of the liquid refrigerant medium at this time, the comparison with the predetermined pressure range is performed, when the actual pressure is smaller than the predetermined pressure range, the gas refrigerant medium flowing into the second pipeline 8 circulates and flows back into the refrigerant tank 2, the first thermostat 1 continues to heat, and on the contrary, when the actual pressure is larger than the predetermined pressure range, the first thermostat 1 stops heating until the actual pressure is within the predetermined pressure range, that is, the fourth stop valve 14 on one side is opened.
As shown in fig. 1, a differential pressure testing device is further arranged on the third pipeline 15, the differential pressure testing device comprises an emptying pipe 19, a first differential pressure testing pipe 20 and a second differential pressure testing pipe 21, the emptying pipe 19 is communicated with the third pipeline 15, the first differential pressure testing pipe 20 is connected to the emptying pipe 19 and communicated with the emptying pipe 19, a fifth stop valve 22 is arranged on the emptying pipe 19, a sixth stop valve 23, a first pressure reducing valve 24, a second pressure reducing valve 25, a third pressure sensor 26, a third electromagnetic valve 27 and a first station to be tested 28 are sequentially arranged on the first differential pressure testing pipe 20, the second differential pressure testing pipe 21 is connected to the first differential pressure testing pipe 20 between the first pressure reducing valve 24 and the second pressure reducing valve 25 and communicated with the first differential pressure testing pipe 20, and a fourth pressure sensor 29, a fourth electromagnetic valve 30 and a second station to be tested 31 are sequentially arranged on the second differential pressure testing pipe 21; minimum differential pressure detection principle: the pressure difference detection is an auxiliary detection function of the system, a valve to be detected is arranged on a first station to be detected 28 or a second station to be detected 31, a supercooled liquid refrigerant medium or a superheated gaseous refrigerant medium flows into a first pressure difference testing pipe 20 from an emptying pipe 19, is decompressed through a first decompression valve 24, directly enters a second pressure difference testing pipe 21 when the pressure is reduced to 0.1MPa, and then the valve to be detected on the second station to be detected 31 is detected, if the pressure is required to be reduced, a refrigerant with the pressure of 0.1MPa decompressed through the first decompression valve 24 is decompressed to 2KPa through a second decompression valve 25, and then the valve to be detected on the first station to be detected 28 is detected, and the detection are used for detecting whether the valve to be detected can be damaged under the corresponding pressure.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A refrigerant valve leakage test system is characterized in that: the device comprises a first constant temperature box (1), a refrigerant tank (2), a second constant temperature box (3), a refrigerant valve (4) to be measured and a weighing environment box (5), wherein the refrigerant tank (2) is positioned in the first constant temperature box (1), refrigerant medium is stored in the refrigerant tank (2), a temperature sensor (6) is arranged on the refrigerant tank (2), a first pipeline (7) communicated with the second constant temperature box (3) is arranged at the bottom of the refrigerant tank (2), a second pipeline (8) communicated with the second constant temperature box (3) is arranged at the top of the refrigerant tank (2), a first stop valve (9), a first pressure sensor (10) and a second stop valve (11) are arranged on the first pipeline (7), the liquid refrigerant medium in the refrigerant tank (2) sequentially passes through the first stop valve (9), the first pressure sensor (10) and the second stop valve (11), a third stop valve (12), a second pressure sensor (13) and a fourth stop valve (14) are arranged on the second pipeline (8), gaseous refrigerant medium in the refrigerant tank (2) sequentially passes through the third stop valve (12), the second pressure sensor (13) and the fourth stop valve (14), a third pipeline (15) communicated with the refrigerant valve (4) to be measured is arranged on the second constant temperature box (3), a fourth pipeline (16) communicated with the weighing environment box (5) is arranged on the refrigerant valve (4) to be measured, a weighing platform (51) and a collecting tank (52) are arranged in the weighing environment box (5), the collecting tank (52) is positioned on the weighing platform (51), and the collecting tank (52) is connected to the fourth pipeline (16);
the refrigerant valve leakage test system further comprises a temperature detection module (101), a first pressure detection module (102), a second pressure detection module (103), a calculation module (105) and a control module (104);
the temperature detection module (101) acquires the temperature value in the refrigerant tank (2) detected by the temperature sensor (6) as the temperature information of the refrigerant tank (2); comparing the temperature information of the refrigerant tank (2) with a preset temperature information range value, and if the temperature information of the refrigerant tank (2) is within the preset temperature information range value, the temperature detection module (101) sends out opening command information;
the first pressure detection module (102) acquires opening command information in the temperature detection module (101), opens the first stop valve (9), closes the second stop valve (11), the third stop valve (12) and the fourth stop valve (14), acquires a pressure value in the first pipeline (7) detected by the first pressure sensor (10) as first pressure information, compares the first pressure information with a preset pressure information range, if the first pressure information is larger than the maximum value of the preset pressure information range, the second stop valve (11) is always closed, the first pressure detection module (102) sends first temperature reduction information, if the first pressure information is smaller than the minimum value of the preset pressure information range, the second stop valve (11) is always closed, the first pressure detection module (102) sends first temperature increase information, if the first pressure information is in the preset pressure information range, the second stop valve (11) is opened, and the first pressure detection module (102) sends out first weighing command information;
the second pressure detection module (103) acquires opening command information in the temperature detection module (101), opens the third stop valve (12), closes the first stop valve (9), the second stop valve (11) and the fourth stop valve (14), acquires a pressure value in the second pipeline (8) detected by the second pressure sensor (13) as second pressure information, compares the second pressure information with a preset pressure information range, if the second pressure information is larger than the maximum value of the preset pressure information range, the fourth stop valve (14) is always closed, the second pressure detection module (103) sends second temperature reduction information, if the second pressure information is smaller than the minimum value of the preset pressure information range, the fourth stop valve (14) is always closed, the second pressure detection module (103) sends second temperature increase information, if the second pressure information is in the preset pressure information range, the fourth stop valve (14) is opened; the second pressure detection module (103) sends out second weighing command information;
when first temperature reduction information in the first pressure detection module (102) or second temperature reduction information in the second pressure detection module (103) is acquired, the control module (104) sends a temperature reduction command to enable the first incubator (1) to start temperature reduction, when first temperature rise information in the first pressure detection module (102) or second temperature rise information in the second pressure detection module (103) is acquired, the control module (104) sends a temperature rise command to enable the first incubator (1) to start temperature rise, and when first weighing command information in the first pressure detection module (102) or second weighing command information in the second pressure detection module (103) is acquired, the control module (104) sends calculation command information;
the calculating module (105) obtains the weight of the initial collecting tank (52) on the weighing platform (51) as first weight information, obtains calculating command information in the control module (104), obtains the weight of the collecting tank (52) on the weighing platform (51) after collection as second weight information, and compares the second weight information with the first weight information to judge whether the refrigerant valve (4) to be detected leaks or not.
2. The refrigerant valve leak test system according to claim 1, wherein: the first pipeline (7) is provided with a first electromagnetic valve (17), the first electromagnetic valve (17) is positioned between a first pressure sensor (10) and a second stop valve (11), the second pipeline (8) is provided with a second electromagnetic valve (18), the second electromagnetic valve (18) is positioned between a second pressure sensor (13) and a fourth stop valve (14), the first pressure detection module (102) converts first pressure information into first temperature information, a difference value is calculated according to the first temperature information and temperature information of the refrigerant tank (2) to serve as first difference value information, the control module (104) acquires the first difference value information to control the working power of the first electromagnetic valve (17) on the circulation loop, the second pressure detection module (103) converts second pressure information into second temperature information, and a difference value is calculated according to the second temperature information and the temperature information of the refrigerant tank (2) to serve as second difference value information, the control module (104) acquires second difference information to control the working power of a second electromagnetic valve (18) on the circulation loop.
3. The refrigerant valve leak test system according to claim 1, wherein: still be equipped with pressure differential testing arrangement on third pipeline (15), pressure differential testing arrangement includes evacuation pipe (19), first pressure differential test pipe (20) and second pressure differential test pipe (21), evacuation pipe (19) communicate with each other with third pipeline (15), first pressure differential test pipe (20) are connected on evacuation pipe (19) and both communicate with each other, be equipped with fifth stop valve (22) on evacuation pipe (19), be equipped with sixth stop valve (23), first relief pressure valve (24), second relief pressure valve (25), third pressure sensor (26), third solenoid valve (27) and first station (28) of awaiting measuring on first pressure differential test pipe (20) in proper order, second pressure differential test pipe (21) are connected on first pressure differential test pipe (20) between first relief pressure valve (24) and second relief pressure valve (25) and both communicate with each other, still be equipped with fourth pressure sensor (29) on second pressure differential test pipe (21) in proper order, A fourth electromagnetic valve (30) and a second station to be tested (31).
4. The refrigerant valve leak test system according to claim 1, wherein: the fourth pipeline (16) is in threaded connection with the refrigerant valve (4) to be tested, and internal threads on the fourth pipeline (16) are conical threads.
5. The refrigerant valve leak test system according to claim 1, wherein: first thermostated container (1) includes the box and is located support (111) and first heating wire (112) in the box, be equipped with constant temperature medium in the box, refrigerant jar (2) are located support (111), first heating wire (112) are around establishing in refrigerant jar (2) outer lane.
6. The refrigerant valve leak test system according to claim 5, wherein: the second constant temperature box (3) comprises a shell, a cold and hot pipe (301), a second heating wire (302) and a water-cooling pipe (303), wherein the cold and hot pipe (301) is positioned in the shell, one end of the cold and hot pipe (301) is respectively communicated with a first pipeline (7) and a second pipeline (8), the other end of the cold and hot pipe (301) is communicated with a third pipeline (15), a constant temperature medium is arranged in the shell, the second heating wire (302) and the water-cooling pipe (303) are respectively wound on the cold and hot pipe (301), a water outlet is formed in one side wall of the upper end of the shell, a water inlet is formed in one side wall of the lower end of the shell, two ends of the water-cooling pipe (303) are respectively arranged on the water inlet and the water outlet, an external pipe (304) is arranged outside the box body, two ends of the external pipe (304) are respectively connected with the water inlet and the water outlet, the water-cooling pipe (303) is communicated with the external pipe (304) to form a cooling pipeline, the external pipe (304) is provided with a pressure pump (305).
7. The refrigerant valve leak test system according to claim 1, wherein: still be equipped with liquid level switch and relief valve on refrigerant jar (2), still be equipped with respectively on first pipeline (7) and third pipeline (15) and look the liquid mirror, still be equipped with the inlet pipe on second pipeline (8), be equipped with the seventh stop valve on the inlet pipe, all be equipped with the vacuum pump on third pipeline (15) and the fourth pipeline (16) of inlet pipe, refrigerant valve (4) both sides that await measuring.
8. The refrigerant valve leak test system according to claim 1, wherein: the predetermined pressure information range is between 0.1MPa and 2.8 MPa.
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