A leak rate quick measurement system for fluid joints for industrial connections and method thereof

Abstract

The present application relates to a kind of quick measurement system of leakage rate of fluid joint for industrial connection, wherein the system includes: volume control module, including the cylinder of the cavity with cylindrical structure and the piston valve installed in cylinder, the piston valve is connected with the piston rod of servo cylinder;When the cavity volume of the cylinder changes during measurement, the piston valve is subjected to the thrust of one side under the action of pressure and slightly moves to this side, the piston valve generates slight gap, air flows into the side of volume increase, until the pressure difference of the left and right sides of cylinder generates the pressure less than the spring force of piston valve, the internal pressure balance of cylinder is realized.The present application also relates to a corresponding method.Using the quick measurement system of leakage rate of fluid joint for industrial connection and its method of the present application, the measurement efficiency is high, the cost is low, it is suitable for the quick detection of leakage rate of most fluid joints, very convenient large-scale popularization and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial connectors, in particular to the field of container leak rate measurement, and more particularly to a leak rate rapid measurement system for fluid joints of industrial connectors and a method thereof. BACKGROUND

[0002] In the development and testing process of industrial connectors, the sealing performance of the connectors, especially the fluid joints, needs to be tested, and the leak rate test is increasingly attracting people's attention. However, in practical applications, the leak rate test of the fluid joint is not so easy. The leak rate test needs to know the volume of the inner cavity of the fluid joint, and the structure of the inner cavity of the joint is complex, so direct measurement is very difficult. The water filling method is slightly complex, but it is time-consuming and inconvenient to operate, and cannot be popularized.

[0003] The invention patent application with publication number CN111649874 A discloses a leak rate testing device for pipe joint sealing element. The box is provided with a leakage gas outlet, the box cover is provided with a medium inlet, the inner bottom surface of the box is connected with a pull-out type sealing tank through a linear slide rail, the pull-out type sealing tank includes a tank body and a tank cover, the tank body is provided with a medium leakage gas outlet, the tank cover is provided with a pipe joint sealing element connecting port for connecting the pipe joint sealing element, the inner side of the pipe joint sealing element connecting port is provided with a sealing ring, the medium leakage gas outlet and the leakage gas outlet are connected through a leakage gas pipe, the medium inlet is provided with a measuring gas inlet pipe with a threaded connecting port, the threaded connecting port is used to connect the pipe joint sealing element, the gas source is connected to the medium inlet through the medium gas inlet pipe, and the leakage gas outlet is connected to a micro-pressure sensor through a leakage gas outlet pipe.

[0004] The invention patent application with publication number CN119023157 A discloses a large-capacity hydrogen storage bottle valve leakage test method and test device. The combined valve of the hydrogen storage bottle is connected with the test fixture, and then the combined valve is immersed below the liquid level of the water tank; the combined valve is filled with hydrogen and pressurized step by step until it reaches the set pressure, and whether there is leakage at the joint and / or sealing of the combined valve is observed; when bubbles are generated, a measuring cylinder is inserted into the water tank to collect the leaked hydrogen gas generated by the combined valve and record the corresponding test parameters; and the hydrogen leakage rate L of the combined valve is calculated.

[0005] Patent application CN118641431 A discloses a gas leakage rate testing device and method for non-metallic hydrogen pipelines. The device includes a sealed test chamber formed after the pipeline to be tested is placed inside the test chamber; a calibration chamber and a test chamber are selectively connected; a first gas injection component is selectively connected to the calibration chamber to inject gas at a first set pressure into the calibration chamber; a measuring unit is configured to measure the pressure and temperature in the calibration chamber and the test chamber, and calculate the volume of the test chamber; and a leakage rate testing unit is configured to acquire the pressure change value of the test chamber within a preset time interval and calculate the gas leakage rate of the pipeline to be tested.

[0006] The aforementioned prior art has the following technical defects:

[0007] (1) No method has yet been proposed for rapid and traceless measurement of the internal volume of irregular fluid joints or other irregular containers.

[0008] (2) It cannot perform leak rate measurement in real time and quickly provide leak rate values.

[0009] (3) Existing technologies for leak rate measurement are costly and complex to operate, making them unsuitable for large-scale promotion.

[0010] Therefore, it is necessary to propose an improved solution to address the practical problem of the difficulty in quickly and seamlessly measuring the volume of irregular containers. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rapid leakage rate measurement system and method for fluid connectors used in industrial connections.

[0012] To achieve the above objectives, the present invention provides a rapid leakage rate measurement system and method for industrial fluid connectors as follows:

[0013] The main feature of this rapid leak rate measurement system for industrial fluid connectors is that the system includes:

[0014] The volume control module includes a cylinder with a cylindrical internal cavity and a piston valve installed in the cylinder. The piston valve is connected to the piston rod of the servo electric cylinder. When the internal volume of the cylinder changes after measurement, the piston valve is pushed by one side under pressure and moves slightly to that side. The piston valve creates a slight gap, and air flows into the side with increased volume. When the pressure difference between the left and right sides of the cylinder is less than the spring force of the piston valve, the internal pressure of the cylinder is balanced.

[0015] Preferably, the piston valve comprises a piston and a valve core, wherein the piston is provided with double rectangular grooves on the outer side in contact with the cylinder, the groove surface is designed with a rounded corner for mounting an O-ring; the valve core is arranged in the piston, a semi-arc rectangular sealing ring and a spring are mounted on the valve core, and the other side of the valve core is connected with a limiting block through threads, and the limiting block is used to limit the compression of the spring with pre-compression elastic force in the inner cavity of the piston.

[0016] Preferably, the E surface of the piston is provided with the double rectangular grooves; the C surface is a tapered surface and is polished, and the semi-arc rectangular sealing ring is arranged on the C surface; the B surface is designed as a gas permeable hole; the A surface at the lower part of the B surface cooperates with the N surface of the valve core, and the A surface and the D surface are both provided with graphene nanometer coating for reducing the friction coefficient.

[0017] Preferably, the F surface of the valve core is used to cooperate with the C surface of the piston; the R position of the semi-arc rectangular sealing ring is designed with a small circular arc; and the M surface of the valve core is used to realize effective compression between the R position of the semi-arc rectangular sealing ring and the C surface of the piston.

[0018] Preferably, a micro-silencer and a porous foam metal layer are integrated at the S position of the valve core surface.

[0019] Preferably, a rectangular protruding mechanism is arranged below the cylinder, the rectangular protruding mechanism is mounted in the inner groove of a sliding table, the sliding table is mounted on a bottom plate with a special wear-resistant low-friction coating and can slide in position, when the sliding table is determined to be fixed in position, the cylinder is fixed on the sliding table through locking screws, and the sliding table is fixed on the bottom plate through screws.

[0020] Preferably, the cylinder is provided with a spiral micro-groove on the inner wall, the spiral micro-groove is used to reduce the air pressure fluctuation when the piston moves; the volume control module is provided with a magnetic type connector on the side adjacent to the spiral micro-groove, the magnetic type connector is connected with a high-pressure gas pipe, and the high-pressure gas pipe is sequentially connected with an electromagnetic valve, a pressure sensor and a to-be-tested connector through a three-way adapter, and the other side of the electromagnetic valve is connected with a pressure regulating valve.

[0021] The method for quickly measuring the leakage rate of a fluid connector for industrial connection by using the system is provided, wherein the method comprises the following steps:

[0022] (1) Complete equipment assembly and confirm that each functional module is working properly;

[0023] (2) Calculate or measure the total volume Vg of the inner cavity of each pipeline of the current speed measurement system;

[0024] (3) Measure the outer dimension Vc of the joint to be tested by using a caliper;

[0025] (4) Estimate the inner cavity volume Vm=Km×Vc, wherein the estimation coefficient Km=0.7; and calculate the initial piston displacement L0 and the target piston displacement L1 according to the inner cavity volume Vm:

[0026] L0=2×Vm / D;

[0027] L1=Vm / D;

[0028] (5) Adjust the pressure value of the pressure regulating valve to the lowest, open the electromagnetic valve, discharge the excess gas, close the electromagnetic valve, and record the initial pressure value P0 of the current pressure sensor;

[0029] (6) Start the servo cylinder, and quickly move the piston from the L0 position to the L1 position, and record the instantaneous pressure value P1 of the current pressure sensor at the same time;

[0030] (7) The system calculates the inner cavity volume Vx of the joint to be tested according to the Clapeyron equation;

[0031] (8) Open the electromagnetic valve to discharge the gas, push the piston to the L0 position, and set the pressure value of the pressure regulating valve to P2 according to the current test pressure;

[0032] (9) When the system determines that the pressure of the pressure sensor tends to be stable, the system records the pressure value P3 of the current pressure sensor; at the same time, the electromagnetic valve is closed, and the timer is started at the same time, the pressure holding time T3 is set, and the system automatically records the pressure change of each stage of pressure holding, and when the pressure holding time T3 is reached, the pressure value at the current time is recorded as Pe;

[0033] (10) The system automatically calculates the leakage rate K in the following manner:

[0034] K=Vx×(P3-Pe) / T3.

[0035] Preferably, the step (7) is specifically:

[0036] According to the Clapeyron equation: PV=NRT, combined with the test system, the equation is transformed as follows:

[0037] P0×(Vg+Vx+L0×π×D×D / 4)=N×R×T0;

[0038] P1×(Vg+Vx+L1×π×D×D / 4)=N×R×T1;

[0039] Wherein, D is the inner diameter of the cylinder, N is the number of gas molecules, R is the gas constant, T is the thermodynamic temperature of the gas; N, R remain unchanged before and after the piston movement, and T0≈T1 in macroscopically, thus:

[0040] P0x (Vg+Vx+L0xpi xDxD / 4) =P1x (Vg+Vx+L1xpi xDxD / 4) ;

[0041] Vx= (P0Vg+P0L0xpi xDxD / 4-P1Vg-P1L1xpi xDxD / 4) / (P1-P0).

[0042] The leakage rate fast measurement system and method for the fluid joint for industrial connection solve the problem of fast leakage rate measurement of irregular containers, especially connector joints, the measurement process is shortened from several hours to less than 15 seconds, and the measurement efficiency is significantly improved. Meanwhile, the measurement system does not need to use various auxiliary materials such as liquids and special gases, the whole test process is pollution-free, and basically realizes traceless measurement. In actual use, the measurement efficiency of the technical scheme is significantly improved, the cost is low, the leakage rate fast detection of most fluid joints is suitable, the large-scale popularization and application are very convenient, and the test precision requirement can be upgraded and expanded, and the compatibility is good. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is the overall structure schematic diagram of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0044] Figure 2 It is the connection relationship schematic diagram among the bottom plate, sliding table and cylinder of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0045] Figure 3 It is the local section schematic diagram of the volume control module of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0046] Figure 4 It is the sealing state section schematic diagram of the volume control module of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0047] Figure 5 It is the exhaust state section schematic diagram of the volume control module of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0048] Figure 6 It is the sealing state section schematic diagram of the piston valve structure of the leakage rate fast measurement system for the fluid joint for industrial connection.

[0049] Figure 7Exhaust state sectional view of piston valve structure of the leak rate fast measuring system of the fluid joint for industrial connection of the present application.

[0050] Figure 8 Structure diagram of piston of the leak rate fast measuring system of the fluid joint for industrial connection of the present application.

[0051] Figure 9 Sectional view of valve core of the leak rate fast measuring system of the fluid joint for industrial connection of the present application.

[0052] Figure 10 Sectional view of semi-arc rectangular sealing ring of the leak rate fast measuring system of the fluid joint for industrial connection of the present application.

[0053] Figure 11 Flow chart of the leak rate fast measuring method of the fluid joint for industrial connection of the present application.

[0054] Figure 12 Schematic diagram of man-machine interactive control interface for leak rate measurement in practical application of the present application.

[0055] Reference signs

[0056] 1 bottom plate

[0057] 2 sliding table

[0058] 3 cylinder body

[0059] 4 piston

[0060] 5 O-ring

[0061] 6 magnetic suction type joint

[0062] 7 piston rod

[0063] 8 valve core

[0064] 9 limit block

[0065] 10 semi-arc rectangular sealing ring

[0066] 11 spring

[0067] 12 high-pressure gas pipe

[0068] 13 three-way adapter

[0069] 14 pressure sensor

[0070] 15 locking screw

[0071] 16 joint to be measured

[0072] 17 servo electric cylinder

[0073] 18 electric cylinder piston rod

[0074] 19 solenoid valve

[0075] 20 pressure regulating valve

[0076] 26 screw

[0077] 30 volume control module DETAILED DESCRIPTION

[0078] In order to make the technical contents of the present application more clearly, the following further describes in combination with specific embodiments.

[0079] Before the detailed description of embodiments according to the present application, it should be noted that in the following, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, thereby making a process, method, article or apparatus that includes a series of elements not only include these elements, but also include other elements not explicitly listed or inherent to such a process, method, article or apparatus.

[0080] Referring to Figure 1 and 2 , the leak rate rapid measurement system of the industrial connection fluid joint is shown, wherein the system comprises a volume control module 30, which comprises a cylinder body 3 with a cylindrical structure of an inner cavity and a piston valve installed in the cylinder body 3, and the piston valve is connected with a piston rod 7 of a servo cylinder 17; when the volume of the inner cavity of the cylinder body 3 changes after the measurement is completed, the piston valve is subjected to a pushing force on one side under the action of pressure and slightly moves to the side, a slight gap is generated in the piston valve, air flows into the side with increased volume, and until the pressure difference generated by the left and right sides of the cylinder body 3 is less than the spring force of the piston valve, the air pressure inside the cylinder body 3 is balanced.

[0081] As a preferred embodiment of the present application, the piston valve comprises a piston 4 and a valve core 8, wherein the piston 4 is provided with double rectangular grooves on the outer side of the side surface in contact with the cylinder body 3, the groove surface is designed with a round corner, and an O-ring 5 is installed; the valve core 8 is arranged in the piston 4, a semi-arc rectangular sealing ring 10 and a spring 11 are installed on the valve core 8, and the other side of the valve core 8 is connected with a limiting block 9 through threads, and the limiting block 9 is used to compress and limit the spring 11 with pre-compression elastic force in the inner cavity of the piston 4.

[0082] As a preferred embodiment of the present application, the E surface of the piston 4 is provided with the double rectangular groove; the C surface is a slanting conical surface, which is polished and provided with the semi-arc rectangular sealing ring 10; the B surface is designed as a gas permeable hole; the A surface at the lower part of the B surface is matched with the N surface of the valve core 8, and the A surface and the D surface are both provided with graphene nano coating for reducing the friction coefficient.

[0083] As a preferred embodiment of the present application, the F surface of the valve core 8 is used to match with the C surface of the piston 4; the R position of the semi-arc rectangular sealing ring 10 is designed as a small circular arc; the M surface of the valve core 8 is used to realize effective compression between the R position of the semi-arc rectangular sealing ring 10 and the C surface of the piston 4.

[0084] As a preferred embodiment of the present application, a micro silencer and a porous foam metal layer are integrally arranged at the S position of the surface of the valve core 8.

[0085] As a preferred embodiment of the present application, a rectangular protruding mechanism is arranged below the cylinder body 3, the rectangular protruding mechanism is installed in the inner groove of the sliding table 2, the sliding table 2 is installed on the bottom plate 1 and can slide in position by using a special wear-resistant low-friction coating, when the sliding table 2 is determined to be fixed in position, the cylinder body 3 is fixed on the sliding table 2 by the locking screw 15, and the sliding table 2 is fixed on the bottom plate 1 by the screw 26.

[0086] The core of the technical solution is the design of the volume control module 30, and the design points of the structure are as follows:

[0087] As shown in Figures 4 to 7 , the cylinder body 3 adopts 45 steel structure, first quenching and tempering, so that the hardness reaches about HRC30, the outer surface is blackened to prevent rust, the inner surface is processed by fine grinding process, so that the surface roughness reaches Ra0.4, and the surface is plated with hard chromium 10u to further improve the surface rust resistance, corrosion resistance and wear resistance.

[0088] The piston 4 adopts 9Cr18Mo steel material, and the vacuum quenching hardness reaches HRC45-50, so that the friction coefficient can be reduced during cooperation and movement, and excellent rust resistance is also achieved. Two high-hardness O-rings 5 are installed on the outer ring of the piston 4, which have a Shore hardness A of 90 degrees and are made of fluororubber material, have high elasticity and hardness, are not easy to deform and wear during rapid high-frequency movement and friction, and can maintain good sealing for a long time.

[0089] As shown in Figure 8 and 9As shown, E of the piston 4 is a double rectangular groove, the groove surface is designed with a rounded corner to avoid wear of the O-ring 5, the metal surface is polished to a roughness of Ra0.4 to improve the sealing performance, C is a tapered surface polished to a roughness of Ra0.4 to also enhance the sealing effect. B is a vent hole, the A surface cooperates with the N surface of the valve core 8, and the surface is coated with graphene nanometer coating to reduce the friction coefficient. The inner cylindrical surface at D is also coated with graphene nanometer coating to reduce the friction coefficient.

[0090] The valve core 8 and the limit block 9 are made of brass 62 copper material, the valve core 8 cooperates with the piston 4 through a gap, the brass is matched with high-hardness steel material, the friction coefficient is low, the movement is smooth, the resistance is small, the spring 11 is pre-compressed to push the limit block 9 to keep a right movement trend, so that the semi-arc rectangular sealing ring 10 on the valve core 8 is fully extruded with the conical surface of the piston 4, thereby realizing the sealing effect.

[0091] The F surface of the valve core 8 cooperates with the C surface of the piston 4, and is optimized through the M structure to satisfy the effective compression amount of 0.2-0.3mm between the R position of the semi-arc rectangular sealing ring 10 and the C surface, which can keep the elasticity of the sealing member and ensure the sealing performance, and has a service life of millions of times, which can be used for a long time.

[0092] As shown, Figure 10 The semi-arc rectangular sealing ring 10 of the valve core 8 is designed as a temperature-sensitive material, a silicone rubber compound, which shrinks at low temperature to enhance the sealing performance and expands at high temperature to avoid jamming; at the same time, the R position of the semi-arc rectangular sealing ring 10 is designed with a small circular arc, which has high strength when subjected to pressure and can keep elasticity for a long time, and because of the circular arc design, the contact surface is larger and the sealing performance is better.

[0093] When the system test is completed and the inductive piston needs to be quickly reset to the right side, the volume of the left cylinder 3 suddenly increases, and under the condition of good sealing on the left side, the volume increase will cause the pressure to decrease, so that the pressure on the right side of the piston 4 is greater than that on the left side, at this time the valve core 8 part will be subjected to a leftward thrust, pushing the valve core 8 to move slightly to the left, thereby driving the semi-arc rectangular sealing ring 10 on the valve core 8 to slightly separate from the piston 4, generating a gap, as shown in Figure 5 and 7 As shown, air will flow from the right side to the left side until the pressure difference between the left side and the right side is less than the spring force of the spring 11, achieving balance.

[0094] Here, a small gap of about 0.5mm is maintained between the piston 4 and the valve core 8, and several small holes are provided on the piston 4, the limit block 9 and the piston rod 7 to ensure that the external air pressure fully acts on the right surface of the valve core 8.

[0095] Meanwhile, the magnetic type joint 6 and the high pressure gas pipe 12 adopt the magnetic coupling interface, the two ends of the high pressure gas pipe 12 are designed with metal materials, the metal pipe is embedded in the gas pipe, the O-shaped ring 5 in the three-way adapter 13 is wrapped on the outer surface of the gas pipe to realize sealing, meanwhile, the magnetic block in the adapter tightly absorbs the gas pipe, through calculation, the suction force is greater than twice the separation force under the maximum internal pressure of the gas.

[0096] A slide rail locking mechanism is arranged between the volume control module 30 and the bottom plate 1, and a rectangular protruding mechanism is arranged below the cylinder body 3, the protruding mechanism is embedded in the groove in the slide table 2, the surface of the slide table 2 is coated with a special wear-resistant low friction coefficient coating, and the cylinder body 3 can freely move and adjust the position on the slide table 2. When the position is determined, the cylinder body 3 is fixed at any position of the slide table 2 through the locking screw 15. The slide table 2 is fixed on the bottom plate 1 through the screw 26.

[0097] As shown in Figure 3 , a spiral micro groove is arranged on the left surface of the inner wall of the cylinder body 3, and the groove is used for reducing the gas pressure fluctuation when the piston 4 moves by utilizing fluid vortex effect; as shown in Figure 9 , a micro silencer is integrated at the S position of the surface of the valve core 8 in the piston 4, and a porous foam metal layer is arranged for reducing the interference of the vibration noise generated by the servo cylinder 17 on the pressure sensor 14.

[0098] In an embodiment of the present application, the diameter D of the cylinder body 3 is designed as 35.7mm, so that the volume change of 1mm movement of the piston 4 is 1ml, and the inner diameter of the gas pipe is selected as 2.5mm, so that the inner cavity volume of the 1mm long pipe is only 0.005ml.

[0099] Meanwhile, the gas pipe in the technical solution adopts the high pressure resistant gas pipe, the deformation amount is small under the test pressure, the adapter adopts the stainless steel material, the interface size is designed according to G1 / 8 or smaller, and the pipe length is designed according to the shortest length, so that the inner cavity volume of the pipe is very small and can be controlled within 1-10cm 3 .

[0100] As shown in Figure 11 and 12 , in actual application, the processing steps of the leakage rate fast measurement method for realizing the industrial connection fluid joint are as follows:

[0101] Step 1: according to the structure shown in Figure 1 , the equipment is assembled, the functions of each module are debugged, and the normality is ensured, and the cylinder diameter D is known;

[0102] Second step: Calculate or measure the total volume of the pipe cavity Vg (not including the volume of the joint to be measured and L0) through three-dimensional software simulation (or by liquid volume injection measurement, i.e. inject liquid into the pipe, then pour it out, and measure the volume), Vg as a constant, input into the control interface.

[0103] Third step: Measure the external dimensions of the joint to be measured using a caliper, and measure the length u, width v, and height w of the cuboid, or the diameter u and length w, and input them into the control interface. Calculate the maximum external volume according to the following formula:

[0104] If it is a cuboid: Vc = u × v × w;

[0105] If it is a cylinder: Vc = π × u × u × w / 4;

[0106] Fourth step: Estimate the internal cavity volume Vm, set the estimation coefficient Km = 0.7, and calculate according to the following formula:

[0107] Vm = Km × Vc;

[0108] Fifth step: Calculate the initial piston displacement L0 and the target piston displacement L1 based on the estimated internal cavity volume Vm:

[0109] L0 = 2 × Vm / D;

[0110] L1 = Vm / D;

[0111] Sixth step: Adjust the pressure to the lowest level using the pressure regulating valve;

[0112] Seventh step: Open the electromagnetic valve to remove excess gas and close it;

[0113] Eighth step: Record the pressure sensor pressure value P0;

[0114] Ninth step: Start the servo motor and quickly push the piston from the L0 position to the L1 position in a short time (0.1-0.5 seconds), and record the instantaneous pressure P1 of the pressure sensor at the same time;

[0115] Tenth step: The system automatically calculates the internal cavity volume Vx of the joint to be measured, and the specific principle is as follows:

[0116] According to the Clapeyron equation: PV = NRT, combined with the system, the following two equations are derived:

[0117] P0 × (Vg + Vx + L0 × π × D × D / 4) = N × R × T0;

[0118] P1 × (Vg + Vx + L1 × π × D × D / 4) = N × R × T1;

[0119] D is the inner diameter of the cylinder, N and R remain unchanged before and after the movement of the piston, and the temperature T is so small that it is ignored, and in the macro T0≈T1. Therefore:

[0120] P0x(Vg+Vx+L0xpi xDx D / 4)=P1x(Vg+Vx+L1xpi xDx D / 4);

[0121] Vx= (P0Vg+P0L0×pi xDx D / 4-P1Vg-P1L1xpi xDx D / 4) / (P1-P0);

[0122] Step 10: The electromagnetic valve is opened to discharge gas, and at the same time the piston is pushed so that L0=0;

[0123] Step 12: According to the test pressure, set the pressure P2 of the pressure regulating valve;

[0124] Step 13: After the system judges that the pressure sensor pressure is stable, the system records the pressure sensor P3; the electromagnetic valve is closed, and the timer is started at the same time, the pressure holding time T3, and the system automatically records the pressure change in each stage of pressure holding. After T3, the pressure value is recorded as Pe.

[0125] Step 14: Automatically calculate the leakage rate K. The calculation principle is as follows:

[0126] K=Vx x(P3-Pe) / T3;

[0127] In addition, in actual application, for the demand with particularly high precision requirement, the pressure sensor can be replaced with a high-precision pressure tester, which can further improve the leakage rate precision to meet the test demand of higher precision leakage rate.

[0128] Any process or method descriptions in the flow charts or described elsewhere herein can be understood as representing modules, segments, or portions of code that include one or more executable instructions for implementing specific logical functions or steps in the process. The scope of preferred embodiments of the present application includes alternative implementations in which the order of steps can be different, including simultaneous performance of the steps, or the steps can be performed in reverse order, or in an order other than that shown or discussed, including according to the functionality of the steps involved, which should be understood by those skilled in the art of the embodiments of the present application.

[0129] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution device.

[0130] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing relevant hardware, and the program can be stored in a computer readable storage medium, and when the program is executed, one or a combination of the steps of the method embodiment is included.

[0131] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0132] In the description of the present specification, the description of the terms "an embodiment", "some embodiments", "an example", "a specific example" or "embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0133] Although the embodiments of the present application have been shown and described above, it is understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

[0134] The leak rate rapid measurement system and method of the fluid connector for industrial connection adopting the present application solve the problem of rapid measurement of the leak rate of irregular containers, especially similar connector joints, and the measurement process is shortened from the current several hours to less than 15 seconds, and the measurement efficiency is significantly improved. At the same time, the measurement system does not need to use various auxiliary materials such as liquids, special gases, etc., and the whole test process is pollution-free, basically realizing traceless measurement. In actual use, the measurement efficiency of the present technical solution is significantly improved, the cost is low, it is suitable for rapid detection of the leak rate of most fluid connectors, is very convenient for large-scale popularization and application, and can be upgraded and expanded according to the test accuracy requirements, and has good compatibility.

[0135] In this specification, the present application has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the present application. Therefore, the specification and drawings should be considered as illustrative rather than limiting.

Claims

1. A rapid leak rate measurement system for fluid connectors used in industrial connections, characterized in that, The system includes: The volume control module (30) includes a cylinder (3) with a cylindrical internal cavity and a piston valve installed in the cylinder (3). The piston valve is connected to the piston rod (7) of the servo electric cylinder (17). When the internal cavity volume of the cylinder (3) changes after the measurement is completed, the piston valve is pushed by one side under the action of pressure and moves slightly to that side. The piston valve generates a slight gap, and air flows into the side with increased volume. When the pressure generated by the pressure difference between the left and right sides of the cylinder (3) is less than the spring force of the piston valve, the internal pressure of the cylinder (3) is balanced. The piston valve includes a piston (4) and a valve core (8). The piston (4) has a double rectangular groove on the outer side of the piston that contacts the cylinder (3). The groove has a rounded corner design for installing an O-ring (5). The valve core (8) is located in the piston (4) and has a semi-circular rectangular sealing ring (10) and a spring (11) installed on it. The other side of the valve core (8) is connected to a limiting block (9) by a thread. The limiting block (9) is used to compress and restrict the spring (11) with pre-compression force in the inner cavity of the piston (4). The cylinder (3) has a spiral microgroove (K) on its inner wall. The spiral microgroove (K) is used to reduce the air pressure fluctuation when the piston (4) moves. The volume control module (30) has a magnetic connector (6) on the side adjacent to the spiral microgroove (K). The magnetic connector (6) is connected to the high-pressure air pipe (12) and is connected to the solenoid valve (19), pressure sensor (14) and test connector (16) in sequence through a three-way adapter (13). The other side of the solenoid valve (19) is connected to the pressure regulating valve (20).

2. The rapid leakage rate measurement system for fluid connectors used in industrial connections according to claim 1, characterized in that, The piston (4) has a double rectangular groove on its E surface; the C surface is a conical surface, which is polished and has a semi-circular rectangular sealing ring (10) on it; the B surface is designed with a vent hole; the A surface located at the bottom of the B surface matches the N surface of the valve core (8), and both the A surface and the D surface are provided with a graphene nano-coating to reduce the coefficient of friction.

3. The rapid leakage rate measurement system for fluid connectors used in industrial connections according to claim 2, characterized in that, The F surface of the valve core (8) is used to mate with the C surface of the piston (4); the R position of the semi-arc rectangular sealing ring (10) adopts a small arc design; the M surface of the valve core (8) is used to achieve effective compression between the R position of the semi-arc rectangular sealing ring (10) and the C surface of the piston (4).

4. The rapid leakage rate measurement system for fluid connectors used in industrial connections according to claim 1, characterized in that, A miniature silencer and a porous foam metal layer are integrated at position S on the surface of the valve core (8).

5. The rapid leakage rate measurement system for fluid connectors used in industrial connections according to claim 1, characterized in that, The cylinder (3) has a rectangular protrusion mechanism below it. The rectangular protrusion mechanism is installed in the inner groove of the slide (2). The slide (2) is coated with a special wear-resistant and low friction coefficient coating and is installed on the base plate (1) for position sliding. After the slide (2) is fixed in a fixed position, the cylinder (3) is fixed on the slide (2) by locking screws (15), and the slide (2) is fixed on the base plate (1) by screws (26).

6. A method for rapid leakage rate measurement of fluid connectors for industrial connections using the system described in claim 1, characterized in that, The method includes the following steps: (1) Complete equipment assembly and confirm that each functional module is working properly; (2) Calculate or measure the total volume Vg of the inner cavity of each pipeline in the current speed measurement system; (3) Use calipers to measure the external dimensions Vc of the connector to be tested; (4) Estimate the internal cavity volume: Vm = Km × Vc, where the estimation coefficient Km = 0.7; and calculate the initial piston displacement L0 and the target piston displacement L1 based on the internal cavity volume Vm: L0 = 2 × Vm / D; L1 = Vm / D; (5) Adjust the pressure value of the pressure regulating valve to the lowest level, open the solenoid valve at the same time, remove excess gas and then close it, and record the initial pressure value P0 of the current pressure sensor. (6) Start the servo electric cylinder and quickly move the piston from position L0 to position L1, and simultaneously record the instantaneous pressure value P1 of the current pressure sensor; (7) The system calculates the volume Vx of the inner cavity of the joint to be tested based on the Clapeyron fundamental equation; (8) Open the solenoid valve and discharge the gas, while pushing the piston to the L0 position, and set the pressure value of the pressure regulating valve to P2 according to the current test pressure; (9) When the system determines that the pressure of the pressure sensor tends to stabilize, the system records the current pressure value of the pressure sensor as P3; at the same time, the solenoid valve is closed and the timer is started synchronously, and the pressure holding time is set to T3. The system automatically records the pressure changes at each stage of pressure holding. When the pressure holding time T3 is reached, the pressure value at the current moment is recorded as Pe. (10) The system automatically calculates the leakage rate K in the following manner: K = Vx × (P3 - Pe) / T3.

7. The method for rapid leakage rate measurement of fluid connectors for industrial connections according to claim 6, characterized in that, The specific steps (7) are as follows: Based on the Clapeyron fundamental equation: PV = NRT, and considering this test system, the transformation equation is as follows: P0×(Vg+Vx+L0×π×D×D / 4)=N×R×T0; P1×(Vg+Vx+L1×π×D×D / 4)=N×R×T1; Where D is the inner diameter of the cylinder, N is the number of gas molecules, R is the gas constant, and T is the thermodynamic temperature of the gas; N and R remain unchanged before and after the piston moves, and macroscopically T0≈T1, therefore: P0×(Vg+Vx+L0×π×D×D / 4)=P1×(Vg+Vx+L1×π×D×D / 4); Vx=(P0Vg+P0L0×π×D×D / 4-P1Vg-P1L1×π×D×D / 4) / (P1-P0).

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