System and method for quickly measuring leakage rate of fluid joint for industrial connection

Abstract

The invention relates to a leak rate rapid measurement system of a fluid connector for industrial connection, and the system comprises a volume control module which comprises a cylinder body with an inner cavity adopting a cylindrical structure and a piston valve installed in the cylinder body, and the piston valve is connected with a piston rod of a servo electric cylinder; when the volume of the inner cavity of the cylinder body changes in the measuring process, the piston valve is pushed by one side under the action of pressure intensity and slightly moves towards the side, a slight gap is generated by the piston valve, air flows into the side with the increased volume, and the volume of the inner cavity of the cylinder body changes. And when the pressure generated by the pressure difference between the left and right sides of the cylinder body is smaller than the spring elasticity of the piston valve, air pressure balance is realized in the cylinder body. The invention also relates to a corresponding method. The system and the method for quickly measuring the leakage rate of the fluid joint for industrial connection are high in measuring efficiency, low in cost, suitable for quickly detecting the leakage rate of most fluid joints, and very convenient for large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to the field of industrial connectors, in particular to the technical field of container leakage rate measurement, and specifically to a system and method for quickly measuring the leakage rate of a fluid connector for industrial connection. Background Art

[0002] During the development and testing of industrial connectors, the sealing properties of connectors, especially fluid connectors, need to be tested. Leak rate testing is gaining increasing attention, but in practice, leak rate testing of fluid connectors is not so easy. Leak rate testing requires knowing the volume of the connector's internal cavity, but the complex structure of the connector cavity makes direct measurement difficult. The water-filled method is slightly more complex, time-consuming, and inconvenient, making it difficult to scale.

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

[0004] The invention patent application with publication number CN119023157A discloses a leakage test method and test device for a large-capacity hydrogen storage bottle valve. The method comprises connecting the combination valve of the hydrogen storage bottle to a test fixture, immersing the combination valve below the liquid level of a water tank, filling the combination valve with hydrogen and gradually increasing the pressure until it reaches the set pressure, observing whether there are leaks at the joints and / or seals of the combination valve. When bubbles are generated, a measuring cylinder is inserted upside down into the water tank to collect the leaked hydrogen generated by the combination valve and the corresponding test parameters are recorded; and calculating the hydrogen leakage rate L of the combination valve.

[0005] The invention patent application with publication number CN118641431 A discloses a gas leakage rate testing device and method that can be used for non-metallic hydrogen transmission pipelines. After the pipeline to be tested is placed in the detection cavity, a sealed test cavity is formed; the calibration cavity is selectively connected to the test cavity; the first gas filling component is selectively connected to the calibration cavity, so as to be suitable for injecting gas of a first set pressure into the calibration cavity; the measuring unit is configured to measure the pressure and temperature in the calibration cavity and the pressure and temperature in the test cavity, and calculate the volume of the test cavity; the leakage rate testing unit is configured to obtain the pressure change value of the test cavity within a preset time interval, and calculate the gas leakage rate of the pipeline to be tested.

[0006] The above-mentioned prior art has the following technical defects: (1) There is no method for rapid and traceless measurement of the inner volume of irregular fluid joints or other irregular containers.

[0007] (2) It is not possible to quickly measure the leak rate in real time and give the leak rate value quickly.

[0008] (3) The existing technology for leak rate measurement is costly and complex to operate, and cannot be promoted on a large scale.

[0009] Based on this, it is necessary to propose an improved solution to solve the practical problem that the volume of irregular containers is difficult to measure quickly and seamlessly. Summary of the Invention

[0010] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a system and method for quickly measuring the leakage rate of a fluid joint for industrial connection.

[0011] In order to achieve the above-mentioned object, the leak rate rapid measurement system and method of the industrial connection fluid joint of the present invention are as follows: The main features of the leak rate rapid measurement system for industrial fluid connectors are as follows: The volume control module includes a cylinder body with a cylindrical inner cavity and a piston valve installed in the cylinder body. The piston valve is connected to the piston rod of the servo electric cylinder. When the volume of the inner cavity of the cylinder body changes during the measurement process, the piston valve is pushed by one side under the action of pressure and moves slightly toward that side. The piston valve creates a slight gap, and air flows into the side with increased volume until the pressure generated by the pressure difference on the left and right sides of the cylinder body is less than the spring force of the piston valve, and the air pressure inside the cylinder body is balanced.

[0012] Preferably, the piston valve includes a piston and a valve core, wherein the piston is provided with a double rectangular groove on the outer side surface in contact with the cylinder body, and the groove surface adopts a rounded corner design for installing an O-ring; the valve core is arranged in the piston, and a semi-arc rectangular sealing ring and a spring are installed thereon, and the other side of the valve core is connected to the limit block through a thread, and the limit block is used to compress the spring with pre-compressed elastic force and limit it in the inner cavity of the piston.

[0013] Preferably, the E surface of the piston is provided with the double rectangular grooves; the C surface is an oblique cone surface, which is polished and provided with the semi-arc rectangular sealing ring; the B surface is designed as an air vent; the A surface located below the B surface cooperates with the N surface of the valve core, and the A surface and the D surface are both provided with a graphene nano-coating to reduce the friction coefficient.

[0014] 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 adopts a small arc design; the M surface of the valve core is used to achieve effective compression between the R position of the semi-arc rectangular sealing ring and the C surface of the piston.

[0015] Preferably, a micro-muffler and a porous foam metal layer are integrated at position S on the valve core surface.

[0016] Preferably, there is a rectangular protrusion mechanism under the cylinder body, and the rectangular protrusion mechanism is installed in the inner groove of the slide, and the slide is installed on the base plate with a special wear-resistant and low-friction coefficient coating and can slide in position. When the slide is determined to be in a fixed position, the cylinder body is fixed to the slide by locking screws, and the slide is fixed to the base plate by screws.

[0017] Preferably, the cylinder body is provided with spiral micro-grooves on the inner wall, and the spiral micro-grooves are used to reduce the air pressure fluctuations during the movement of the piston; and the volume control module is provided with a magnetic connector on the side adjacent to the spiral micro-grooves, and the magnetic connector is connected to the high-pressure air pipe, and is connected to the solenoid valve, pressure sensor and test connector in sequence through a three-way adapter, and the other side of the solenoid valve is connected to the pressure regulating valve.

[0018] The method for quickly measuring the leakage rate of a fluid joint for industrial connection using the above-mentioned system 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 a caliper to measure the external dimension Vc of the joint to be tested; (4) Estimate the inner 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 inner cavity volume Vm: L0=2×Vm / D; L1=Vm / D; (5) Adjust the pressure value of the pressure regulating valve to the lowest value, open the solenoid valve at the same time, remove excess gas and close it, and record the initial pressure value P0 of the current pressure sensor; (6) Start the servo 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 inner cavity volume Vx of the joint to be tested based on the Clapeyron basic equation; (8) Open the solenoid valve and exhaust 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 is stable, 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 the pressure holding. When the pressure holding time T3 is reached, the current pressure value is recorded as Pe; (10) The system described herein automatically calculates the leak rate K in the following manner: K=Vx×(P3-Pe) / T3.

[0019] Preferably, the step (7) is specifically as follows: According to Clapeyron's basic equation: PV = NRT, combined with 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).

[0020] The rapid leak rate measurement system and method for industrial fluid connectors of the present invention solve the problem of rapid leak rate measurement in irregular containers, particularly connector-like joints. The measurement process is shortened from several hours to less than 15 seconds, significantly improving measurement efficiency. Furthermore, the measurement system eliminates the need for auxiliary materials such as liquids and special gases, ensuring a pollution-free testing process and essentially achieving traceless measurement. In actual use, this technical solution significantly improves measurement efficiency, is low-cost, and is suitable for rapid leak rate detection of most fluid connectors. It is highly convenient for large-scale promotion and application, can be upgraded and expanded according to test accuracy requirements, and has good compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the leakage rate rapid measurement system of the industrial connection fluid joint of the present invention.

[0022] Figure 2 The figure is a schematic diagram of the connection relationship between the base plate, the slide table and the cylinder body of the leakage rate rapid measurement system of the industrial connection fluid joint of the present invention.

[0023] Figure 3 It is a partial cross-sectional schematic diagram of the volume control module of the leakage rate rapid measurement system of the industrial fluid connector of the present invention.

[0024] Figure 4 This is a cross-sectional schematic diagram of the sealed state of the volume control module of the leakage rate rapid measurement system of the industrial connection fluid connector of the present invention.

[0025] Figure 5 This is a cross-sectional schematic diagram of the exhaust state of the volume control module of the leak rate rapid measurement system of the industrial fluid connector of the present invention.

[0026] Figure 6 This is a cross-sectional schematic diagram of the sealing state of the piston valve structure of the leakage rate rapid measurement system of the industrial connection fluid connector of the present invention.

[0027] Figure 7 This is a cross-sectional schematic diagram of the exhaust state of the piston valve structure of the leakage rate rapid measurement system of the industrial connection fluid connector of the present invention.

[0028] Figure 8 This is a schematic structural diagram of the piston of the leakage rate rapid measurement system of the industrial fluid connector of the present invention.

[0029] Figure 9 It is a cross-sectional schematic diagram of the valve core of the leakage rate rapid measurement system of the industrial connection fluid joint of the present invention.

[0030] Figure 10This is a schematic cross-sectional view of a semi-arc rectangular sealing ring of the leakage rate rapid measurement system of the industrial fluid connector of the present invention.

[0031] Figure 11 The flowchart of the method for quickly measuring the leakage rate of the industrial fluid joint of the present invention is shown.

[0032] Figure 12 The figure is a schematic diagram of the human-computer interaction control interface for leak rate measurement in practical application of the present invention.

[0033] Reference numerals 1 bottom plate 2 slides 3 cylinders 4 pistons 5 O-ring 6 Magnetic connector 7 Piston rod 8 valve core 9 Limit block 10 semi-arc rectangular sealing ring 11 Spring 12 High-pressure air pipe 13 Tee adapter 14. Pressure sensor 15 Locking screw 16 Connectors to be tested 17 Servo cylinder 18 Electric cylinder piston rod 19 Solenoid valve 20 Pressure regulating valve 26 screws 30 Volume Control Module DETAILED DESCRIPTION

[0034] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0035] Before describing in detail embodiments according to the present invention, it should be noted that, hereinafter, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, whereby a process, method, article, or apparatus comprising a list of elements includes not only those elements, but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] See also Figure 1 and 2As shown, the leakage rate rapid measurement system of the fluid connector for industrial connection includes: a volume control module 30, including a cylinder 3 with a cylindrical inner cavity and a piston valve installed in the cylinder 3, and the piston valve is connected to the piston rod 7 of the servo electric cylinder 17; when the volume of the inner cavity of the cylinder 3 changes during the measurement process, the piston valve is pushed by one side under the action of pressure and moves slightly toward the side, and a slight gap is generated in the piston valve, and air flows into the side with increased volume until the pressure generated by the pressure difference on the left and right sides of the cylinder 3 is less than the spring force of the piston valve, and the air pressure inside the cylinder 3 is balanced.

[0037] As a preferred embodiment of the present invention, the piston valve includes a piston 4 and a valve core 8, wherein the piston 4 is provided with a double rectangular groove on the outer side surface in contact with the cylinder body 3, and the groove surface adopts a rounded corner design for installing an O-ring 5; the valve core 8 is arranged in the piston 4, and a semi-arc rectangular sealing ring 10 and a spring 11 are installed thereon, and the other side of the valve core 8 is connected to the limit block 9 through a thread, and the limit block 9 is used to compress the spring 11 with pre-compressed elastic force and limit it in the inner cavity of the piston 4.

[0038] As a preferred embodiment of the present invention, the E surface of the piston 4 is provided with the double rectangular grooves; the C surface is an oblique cone surface, which is polished and provided with the semi-arc rectangular sealing ring 10; the B surface is designed as an air vent; the A surface located below the B surface cooperates with the N surface of the valve core 8, and the A surface and the D surface are both provided with a graphene nano-coating to reduce the friction coefficient.

[0039] As a preferred embodiment of the present invention, the F surface of the valve core 8 is used to cooperate 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.

[0040] As a preferred embodiment of the present invention, a micro-muffler and a porous foam metal layer are integrated and provided at position S on the surface of the valve core 8 .

[0041] As a preferred embodiment of the present invention, there is a rectangular protrusion mechanism under the cylinder body 3, and the rectangular protrusion mechanism is installed in the inner groove of the slide 2, and the slide 2 is installed on the base plate 1 with a special wear-resistant and low-friction coefficient coating and can slide in position. After the slide 2 determines the fixed position, the cylinder body 3 is fixed to the slide 2 by the locking screw 15, and the slide 2 is fixed to the base plate 1 by the screw 26.

[0042] The core of this technical solution lies in the design of the volume control module 30. The key points of its structure are as follows: like Figures 4 to 7 As shown, the cylinder body 3 adopts 45 steel structure, which is first tempered to make the hardness reach about HRC30, the outer surface is blackened to prevent rust, and the inner surface is processed by fine grinding to make the surface roughness reach Ra0.4. At the same time, the surface is plated with hard chrome 10u to further improve the surface anti-rust, corrosion resistance and wear resistance.

[0043] Piston 4 is made of 9Cr18Mo steel, vacuum-hardened to a hardness of HRC45-50. This reduces friction during movement and provides excellent rust resistance. Two high-hardness O-rings 5, Shore A 90, are mounted on the outer ring of piston 4. Made of fluororubber, they exhibit high elasticity and hardness, resist deformation and wear during rapid, high-frequency friction, ensuring a long-lasting seal.

[0044] like Figure 8 and 9 As shown, piston 4 has dual rectangular grooves at point E. The grooves feature rounded corners to prevent wear on O-ring 5. The metal surface is polished to a roughness of Ra0.4, enhancing sealing. Point C features an oblique tapered surface, polished to a roughness of Ra0.4, also enhancing sealing. Point B is a vent. Surface A, mating with surface N of valve core 8, is coated with a graphene nanocoating to reduce friction. The inner cylindrical surface at point D also features a graphene nanocoating to reduce friction.

[0045] The valve core 8 and the limit block 9 are both made of brass 62 copper. The valve core 8 and the piston 4 are fitted with a gap. Brass is matched with high-hardness steel, with a low friction coefficient, smooth movement and small resistance. The spring 11 pushes the limit block 9 to maintain a rightward movement trend through pre-compression elastic force, so that the semi-arc rectangular sealing ring 10 on the valve core 8 is fully squeezed with the conical surface of the piston 4, thereby achieving a sealing effect.

[0046] The F surface of the valve core 8 cooperates with the C surface of the piston 4 and is optimized through the M structure, which can meet the effective compression amount of 0.2-0.3mm between the R and C surface of the semi-arc rectangular sealing ring 10, which can not only maintain the elasticity of the seal, but also ensure the sealing performance. At the same time, it has a service life of millions of levels and can be used for a long time.

[0047] like Figure 10 As shown, the semi-arc rectangular sealing ring 10 of the valve core 8 is designed as a temperature-sensitive material, a silicone rubber composite, which shrinks at low temperatures to enhance sealing and expands at high temperatures to avoid jamming; at the same time, the R position of the semi-arc rectangular sealing ring 10 adopts a small arc design, which has higher strength when subjected to pressure and can maintain elasticity for a long time. At the same time, due to the arc design, the contact surface is larger and the sealing is better.

[0048] When the system test is finished and the inductive piston needs to be quickly reset to the right, the volume of the inner cavity of the left cylinder 3 suddenly increases. If the left side is well sealed, the volume increase will cause the pressure to decrease, making the pressure on the right side of the piston 4 greater than the pressure on the left side. At this time, the valve core 8 will be subjected to a leftward thrust as a whole, 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, such as Figure 5 and 7 As shown, the air will take the opportunity to flow from the right side to the left side until the pressure generated by the pressure difference between the left and right sides is less than the elastic force of the spring 11, achieving balance.

[0049] Here, a small gap of about 0.5 mm is maintained between the piston 4 and the valve core 8. Several small holes are set 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 side surface of the valve core 8.

[0050] At the same time, the magnetic connector 6 and the high-pressure air pipe 12 adopt a magnetic coupling interface. The two ends of the high-pressure air pipe 12 are designed with metal materials, and a metal tube is embedded in the air pipe. After the air pipe is inserted into the three-way adapter 13, the O-ring 5 inside the three-way adapter 13 is wrapped around the outer surface of the air pipe to achieve sealing. At the same time, the magnetic block inside the adapter tightly absorbs the air pipe. Through calculation, the suction force is ≥ twice the separation force under the maximum internal pressure of the gas.

[0051] A slide rail locking mechanism is installed between the volume control module 30 and the base plate 1. A rectangular protrusion is located below the cylinder 3, which fits snugly into the inner groove of the slide 2. The slide 2 is coated with a special wear-resistant, low-friction coating, allowing the cylinder 3 to be freely moved and adjusted on the slide 2. Once positioned, the cylinder 3 is secured to any position on the slide 2 by tightening screws 15. The slide 2 is secured to the base plate 1 with screws 26.

[0052] like Figure 3 As shown, the left side surface of the inner wall of the cylinder body 3 is provided with a machined spiral micro-groove, which utilizes the fluid vortex effect to reduce the pressure fluctuation when the piston 4 moves; Figure 9 As shown, a micro silencer and a porous foam metal layer are integrated at position S on the surface of the valve core 8 inside the piston 4 to reduce the interference of the vibration noise generated by the servo cylinder 17 on the pressure sensor 14.

[0053] In a specific embodiment of the present invention, the diameter D of the cylinder 3 is designed to be 35.7 mm, so that the volume change caused by the movement of the piston 4 by 1 mm is 1 ml. The inner diameter of the trachea is selected to be 2.5 mm, so that the volume of the inner cavity of the 1 mm long pipeline is only 0.005 ml.

[0054] At the same time, the air pipes described in this technical solution are all made of high-pressure resistant air pipes, which have very little deformation under the test pressure. The adapters are made of stainless steel, and the interface sizes are designed according to G1 / 8 or smaller. The pipe length is designed according to the shortest length, which can make the inner cavity volume of the pipe very small and controlled within 1-10cm. 3 Within.

[0055] like Figure 11 and 12 As shown, in actual application, the processing steps of the method for quickly measuring the leakage rate of the fluid connector for industrial connection are as follows: Step 1: Follow the Figure 1 Assemble the equipment and debug the functions of each module to ensure normal operation. The cylinder diameter D is known. Step 2: Calculate or measure the total volume Vg of the pipeline cavity (excluding the volume of the joint to be tested and L0) through 3D software simulation (or through the liquid volume injection measurement method, that is, injecting liquid into the pipeline, pouring it out, and measuring the volume). Vg is input into the control interface as a constant.

[0056] Step 3: Use a caliper to measure the dimensions of the joint to be tested. For a rectangular parallelepiped, measure the length u, width v, and height w, or the diameter u and length w, and input them into the control interface. Calculate the maximum volume using the following formula: If it is a rectangular parallelepiped: Vc=u×v×w; If it is a cylinder: Vc=π×u×u×w / 4; Step 4: Estimate the inner cavity volume Vm, set the estimation coefficient Km=0.7, according to the following formula: Vm=Km×Vc; Step 5: Calculate the initial piston displacement L0 and target piston displacement L1 based on the estimated inner cavity volume Vm: L0=2×Vm / D; L1=Vm / D; Step 6: Use the pressure regulating valve to adjust the pressure to the lowest level; Step 7: The solenoid valve opens, removes excess gas, and then closes; Step 8: Record the pressure value P0 of the pressure sensor; Step 9: Start the servo motor and quickly push the piston from position L0 to position L1 within a short period of time (0.1-0.5 seconds). After reaching the position, the instantaneous pressure P1 of the pressure sensor is synchronously recorded. Step 10: The system automatically calculates the inner cavity volume Vx of the joint to be tested. The specific principles are as follows: According to Clapeyron's basic equation: PV=NRT, combined with this system, the following two equations are transformed: P0×(Vg+Vx+L0×π×D×D / 4)=N×R×T0; P1×(Vg+Vx+L1×π×D×D / 4)=N×R×T1; D is the inner diameter of the cylinder. N and R remain unchanged before and after the piston moves, and the temperature T changes very little and can be ignored. 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); Step 11: The solenoid valve opens to exhaust the gas and pushes the piston to make L0=0; Step 12: Set the pressure regulating valve pressure P2 according to the test pressure; Step 13: After the system determines that the pressure of the pressure sensor is stable, the system records the pressure sensor P3; closes the solenoid valve and starts the timer synchronously. The pressure holding time is T3. The system automatically records the pressure changes in each stage of pressure holding. After T3 is reached, the pressure value is recorded as Pe.

[0057] Step 14: Automatically calculate the leak rate K. The calculation principle is as follows: K=Vx×(P3-Pe) / T3; In addition, in actual applications, for particularly high precision requirements, the pressure sensor can be replaced with a high-precision pressure tester, which can further improve the leak rate accuracy to meet the testing needs of higher precision leak rates.

[0058] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0059] It should be understood that each part of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution device.

[0060] Those skilled in the art will understand that all or part of the steps of the method for implementing the above-mentioned embodiment can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0061] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0062] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "embodiment" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0064] The rapid leak rate measurement system and method for industrial fluid connectors of the present invention solve the problem of rapid leak rate measurement in irregular containers, particularly connector-like joints. The measurement process is shortened from several hours to less than 15 seconds, significantly improving measurement efficiency. Furthermore, the measurement system eliminates the need for auxiliary materials such as liquids and special gases, ensuring a pollution-free testing process and essentially achieving traceless measurement. In actual use, this technical solution significantly improves measurement efficiency, is low-cost, and is suitable for rapid leak rate detection of most fluid connectors. It is highly convenient for large-scale promotion and application, can be upgraded and expanded according to test accuracy requirements, and has good compatibility.

[0065] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims

1. A rapid leakage rate measurement system for industrial fluid connectors, characterized in that: The system comprises: The volume control module (30) comprises a cylinder (3) with an inner cavity having a cylindrical structure and a piston valve installed in the cylinder (3), wherein the piston valve is connected to the piston rod (7) of the servo electric cylinder (17); when the volume of the inner cavity of the cylinder (3) changes during the measurement process, the piston valve is pushed by one side under the action of pressure and moves slightly toward the side, and a slight gap is generated in the piston valve, and air flows into the side with increased volume until 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, and the air pressure inside the cylinder (3) is balanced.

2. The rapid leakage rate measurement system for industrial fluid connectors according to claim 1, characterized in that: The piston valve comprises a piston (4) and a valve core (8), wherein the piston (4) is provided with a double rectangular groove on the outer side surface in contact with the cylinder body (3), and the groove surface adopts a rounded corner design for installing an O-ring (5); the valve core (8) is arranged in the piston (4), and a semi-arc rectangular sealing ring (10) and a spring (11) are installed thereon, and the other side of the valve core (8) is connected to a limit block (9) through a thread, and the limit block (9) is used to compress the spring (11) with a pre-compressed elastic force and limit it in the inner cavity of the piston (4).

3. The rapid leakage rate measurement system for industrial fluid connectors according to claim 2, characterized in that: The E surface of the piston (4) is provided with the double rectangular grooves; the C surface is an oblique conical surface, which is polished and provided with the semi-arc rectangular sealing ring (10); the B surface is designed as an air vent; the A surface located below 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 a graphene nano-coating for reducing the friction coefficient.

4. The rapid leakage rate measurement system for industrial fluid connectors according to claim 3, characterized in that: The F surface of the valve core (8) is used to cooperate 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).

5. The rapid leakage rate measurement system for industrial fluid connectors according to claim 2, characterized in that: A micro silencer and a porous foam metal layer are integrated at position S on the surface of the valve core (8).

6. The rapid leakage rate measurement system for industrial fluid connectors according to claim 1, characterized in that: There is a rectangular protrusion mechanism below the cylinder body (3), and the rectangular protrusion mechanism is installed in the inner groove of the slide (2), and the slide (2) is installed on the base plate (1) with a special wear-resistant low friction coefficient coating and can slide in position. When the slide (2) is determined to be in a fixed position, the cylinder body (3) is fixed to the slide (2) by the locking screw (15), and the slide (2) is fixed to the base plate (1) by the screw (26).

7. The rapid leakage rate measurement system for industrial fluid connectors according to claim 2, characterized in that: The cylinder body (3) is provided with a spiral micro-groove (K) on the inner wall, and the spiral micro-groove (K) is used to reduce the air pressure fluctuation when the piston (4) moves; and the volume control module (30) is provided with a magnetic joint (6) on the side adjacent to the spiral micro-groove (K), and the magnetic joint (6) is connected to the high-pressure air pipe (12), and is connected to the electromagnetic valve (19), the pressure sensor (14) and the test joint (16) in sequence through the three-way adapter (13), and the other side of the electromagnetic valve (19) is connected to the pressure regulating valve (20).

8. A method for quickly measuring the leakage rate of a fluid joint for industrial connection using the system according to claim 7, characterized in that: The method comprises 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 a caliper to measure the external dimension Vc of the joint to be tested; (4) Estimate the inner 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 inner cavity volume Vm: L0=2×Vm / D; L1=Vm / D; (5) Adjust the pressure value of the pressure regulating valve to the lowest value, open the solenoid valve at the same time, remove excess gas and close it, and record the initial pressure value P0 of the current pressure sensor; (6) Start the servo 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 inner cavity volume Vx of the joint to be tested based on the Clapeyron basic equation; (8) Open the solenoid valve and exhaust 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 is stable, 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 the pressure holding. When the pressure holding time T3 is reached, the current pressure value is recorded as Pe; (10) The system described herein automatically calculates the leak rate K in the following manner: K=Vx×(P3-Pe) / T3.

9. The method for quickly measuring the leakage rate of a fluid joint for industrial connection according to claim 8, characterized in that: The step (7) is specifically as follows: According to Clapeyron's basic equation: PV = NRT, combined with 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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