A breathing valve test bench and test method for improving test efficiency

Abstract

The present invention relates to the field of valve testing technology, and specifically to a breathing valve test bench and test method for improving test efficiency, comprising a frame, a frame platform arranged at the upper end of the frame, a number of test stations arranged on the frame platform, and an air collecting box arranged at the lower part of the frame, each of the test stations is provided with a docking pipe for installing a breathing valve, the docking pipe is connected to the inside of the air collecting box through a test pipeline, the air collecting box is connected to a vacuum pumping device through a vacuum suction pipeline, the air collecting box is connected to an air supply unit through an air intake pipeline, a ball valve is arranged on the vacuum suction pipeline, and a needle valve is arranged on the air intake pipeline. The present invention improves the test accuracy and test efficiency of the breathing valve.

Description

Technical Field

[0001] The invention relates to the technical field of valve testing, and in particular to a breathing valve test bench and a test method for improving test efficiency. Background Art

[0002] Marine breathing valve is a breathing device that can automatically adjust the cargo hold pressure. It is used to keep the cargo hold of liquid cargo ships such as chemicals and natural gas at a certain safe pressure during the filling, transportation and barge process. There are mainly gravity type, magnetic type and pilot type. Liquefied gas ships often use pilot breathing valves (because of their high pressure control accuracy and high opening and closing action sensitivity). After the valve is repaired and assembled, it needs to be tested for tightness. The main test items are: check and adjust the positive pressure start and negative pressure start pressure values; check and adjust the pressure value of valve closing; check the air tightness of the valve body.

[0003] In the prior art, the test accuracy and test efficiency of marine breathing valves are low. In order to efficiently and accurately complete the tightness test of breathing valves, we developed a special test bench. Summary of the invention

[0004] In order to improve the test accuracy and test efficiency of the breathing valve, the present invention proposes a breathing valve test bench and a test method for improving the test efficiency. The specific technical scheme is as follows:

[0005] A breathing valve test bench for improving test efficiency, comprising a frame, a frame platform arranged at the upper end of the frame, a number of test stations arranged on the frame platform, and an air collecting box arranged at the lower part of the frame, each of the test stations is provided with a docking pipe for installing a breathing valve, the docking pipe is connected to the interior of the air collecting box through a test pipeline, the air collecting box is connected to a vacuum device through a vacuum suction pipeline, the air collecting box is connected to an air supply unit through an air intake pipeline, a ball valve is provided on the vacuum suction pipeline, and a needle valve is provided on the air intake pipeline.

[0006] In the present invention, a ball valve is arranged on the test pipeline, an exhaust branch pipe is arranged on the air intake pipeline, a ball valve is arranged on the exhaust branch pipe, and a flange connected to the breathing valve is arranged on the docking pipeline.

[0007] Preferably, the vacuum pumping device is a vacuum compressor, and the gas supply unit is a nitrogen gas supply unit.

[0008] In the present invention, a control air circuit connected to the breathing valve is arranged on the test pipeline, and a needle valve is arranged on the control air circuit.

[0009] As a further improvement of the present invention, an independent main air storage box is arranged inside the air collecting box, and the main air storage box occupies the main space inside the air collecting box. A secondary space is formed between the outside of the main air storage box and the inside of the air collecting box. The air supply unit is connected to the main air storage box through an air storage pipeline, and a first valve is arranged between the main space of the main air storage box and the secondary space of the air collecting box.

[0010] As a further improvement of the present invention, an independent high-pressure gas tank is arranged inside the main gas tank, the gas supply unit is connected to the high-pressure gas tank via a boosting pipeline, the boosting pipeline is provided with a gas booster for forming the high pressure of the gas in the high-pressure gas tank, and a second valve is provided between the high-pressure gas tank and the main gas tank.

[0011] Preferably, a first pressure sensor is provided on the main air storage tank, and the second valve is an electric regulating valve. The control system of the breathing valve test bench dynamically controls the gas pressure in the main air storage tank to maintain the pressure set in the test through the first pressure sensor and the electric regulating valve.

[0012] The breathing valve test bench for improving the test efficiency of the present invention further comprises a pressure gauge arranged on the test pipeline and a second pressure sensor arranged on the docking pipeline for detecting the internal pressure of the breathing valve.

[0013] Preferably, the pressure gauge is a digital pressure gauge.

[0014] The breathing valve test bench for improving the test efficiency of the present invention can also perform an air tightness test on the breathing valve. The air tightness test includes a negative pressure air tightness test and a positive pressure air tightness test. During the test, it is necessary to adjust the negative pressure of the vacuum device and the positive pressure of the air supply unit so that the test pressure is between the negative pressure start-up test pressure and the positive pressure start-up test pressure, and observe the pressure change by maintaining the pressure for a certain period of time to judge whether the air tightness test of the breathing valve is qualified.

[0015] A test method for a breathing valve test bench for improving test efficiency comprises the following steps:

[0016] (1) Breathing valve installation: Install a set of breathing valves on the flanges of each docking pipe, and connect the control gas circuit on the test pipeline to the breathing valve;

[0017] (2) Positive pressure start-up test: close the ball valve on the vacuum suction pipeline, adjust the needle valve on the air intake pipeline to an appropriate opening, and use the air supply unit to inflate and pressurize the breathing valve through the air collecting box, and open the ball valve on the test pipeline. Keep the pressure rise rate uniformly at about 0.001MPa / s during the positive pressure test process, so as to accurately collect the pressure value of the positive pressure start-up of the breathing valve. If the pressure value deviates from the allowable deviation range, adjust it to meet the test requirements. After the test process is completed, release the pressure in the secondary space of the air collecting box by controlling the ball valve on the exhaust branch pipe;

[0018] (3) Negative pressure start test: Close the needle valve on the air intake pipe, turn on the vacuum device to vacuum the breathing valve, and check whether the negative pressure start pressure value meets the specification.

[0019] In order to improve the efficiency of the test, a further improved test method is: at the initial stage of the positive pressure take-off test, the first valve is also opened to quickly inflate the group of breathing valves, and the first valve is closed in advance before the pressure in the breathing valve reaches the pressure set in the test; wherein, during the rapid inflation, the control system senses the pressure change in the breathing valve through the second pressure sensor, senses the pressure change in the main air tank through the first pressure sensor arranged on the main air tank, and dynamically controls the gas pressure in the main air tank to maintain it at the pressure set in the test by controlling the second valve.

[0020] The beneficial effects of the present invention are:

[0021] First, the present invention provides a breathing valve test bench and test method for improving test efficiency, which realizes positive pressure start-up test, negative pressure start-up test and air tightness test of the breathing valve by setting an air collecting box and an air supply unit and a vacuum device respectively connected to the air collecting box. The whole device has a simple structure, high working efficiency and good test accuracy.

[0022] Second, the present invention provides a breathing valve test bench and test method for improving test efficiency. A main air storage box is set inside the air collecting box to form a secondary space between the main air storage box and the air collecting box. The volume of the secondary space is greatly reduced, thereby reducing the time for vacuuming during the negative pressure take-off test, thereby further improving the test efficiency.

[0023] Third, the breathing valve test bench and test method of the present invention for improving test efficiency, by setting a high-pressure air storage tank inside the main air storage tank, on the one hand, improves the stability of the air supply, and on the other hand, increases the air supply speed in the initial stage of the positive pressure take-off test, thereby further improving the efficiency of the test.

[0024] Fourthly, a breathing valve test bench and a test method for improving test efficiency of the present invention improve space utilization and reduce the floor space of the equipment by setting a main air storage box and a high-pressure air storage box inside the air collecting box.

[0025] Fifth, the breathing valve test bench and test method of the present invention for improving test efficiency can meet the in-field test of the pilot breathing valve of the current very large gas carrier (VLGC) liquid cargo system after repair. It has strong target object targeting, high test accuracy, easy operation and control, and has the advantages of low gas medium consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a breathing valve test bench for improving test efficiency of the present invention;

[0027] Figure 2 is Figure 1 A schematic diagram of the structure in which the main air storage box and the high-pressure air storage box are set inside the air collecting box.

[0028] In the figure: 1, rack, 2, rack platform, 3, test station, 4, gas collecting box, 5, docking pipeline, 6, test pipeline, 7, vacuum suction pipeline, 8, vacuum device, 9, air intake pipeline, 10, air supply unit, 11, ball valve, 12, needle valve, 13, exhaust branch pipe, 14, flange, 15, control air circuit, 16, main air storage box, 17, air storage pipeline, 18, first valve, 19, high-pressure air storage box, 20, boosting pipeline, 21, gas booster, 22, second valve, 23, first pressure sensor, 24, pressure gauge, 25, second pressure sensor, 26, breathing valve, 27, one-way valve. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0030] Embodiment 1:

[0031] like Figures 1 to 2The figure shows an embodiment of a breathing valve test bench for improving test efficiency of the present invention, comprising a frame 1, a frame platform 2 arranged at the upper end of the frame 1, a number of test stations 3 arranged on the frame platform 2, and an air collecting box 4 arranged at the lower part of the frame 1, each of the test stations 3 is provided with a docking pipe 5 for installing a breathing valve 26, the docking pipe 5 is connected to the interior of the air collecting box 4 through a test pipeline 6, the air collecting box 4 is connected to a vacuum device 8 through a vacuum suction pipeline 7, the air collecting box 4 is connected to an air supply unit 10 through an air intake pipeline 9, a ball valve 11 is provided on the vacuum suction pipeline 7, and a needle valve 12 is provided on the air intake pipeline 9.

[0032] In this embodiment, a ball valve 11 is provided on the test pipeline 6, an exhaust branch pipe 13 is provided on the air intake pipeline 9, a ball valve 11 is provided on the exhaust branch pipe 13, and a flange 14 connected to the breathing valve 26 is provided on the docking pipe 5.

[0033] Preferably, the vacuum pumping device 8 is a vacuum compressor, and the gas supply unit 10 is a nitrogen gas supply unit.

[0034] In this embodiment, a control gas circuit 15 connected to the breathing valve 26 is provided on the test pipeline 6 , and a needle valve 12 is provided on the control gas circuit 15 .

[0035] As a further improvement of this embodiment, an independent main air storage tank 16 is arranged inside the air collecting box 4, and the main air storage tank 16 occupies the main space inside the air collecting box 4. A secondary space is formed between the outside of the main air storage tank 16 and the inside of the air collecting box 4. The air supply unit 10 is connected to the main air storage tank 16 through an air storage pipeline 17, and a first valve 18 is arranged between the main space of the main air storage tank 16 and the secondary space of the air collecting box 4.

[0036] As a further improvement of this embodiment, an independent high-pressure gas tank 19 is arranged inside the main gas tank 16, and the gas supply unit 10 is connected to the high-pressure gas tank 19 through a boosting pipeline 20. The boosting pipeline 20 is provided with a gas booster 21 for forming the high pressure of the gas in the high-pressure gas tank 19, and a second valve 22 is arranged between the high-pressure gas tank 19 and the main gas tank 16.

[0037] Preferably, the main air tank 16 is provided with a first pressure sensor 23, and the second valve 22 is an electric regulating valve. The control system of the breathing valve test bench dynamically controls the gas pressure in the main air tank 16 to maintain the pressure set in the test through the first pressure sensor 23 and the electric regulating valve.

[0038] The breathing valve test bench for improving the test efficiency of this embodiment further includes a pressure gauge 24 arranged on the test pipeline 6 and a second pressure sensor 25 arranged on the docking pipeline 5 for detecting the internal pressure of the breathing valve 26 .

[0039] Preferably, the pressure gauge 24 is a digital pressure gauge.

[0040] The breathing valve test bench for improving the test efficiency of this embodiment can also perform an air tightness test on the breathing valve 26. The air tightness test includes a negative pressure air tightness test and a positive pressure air tightness test. During the test, it is necessary to adjust the negative pressure of the vacuum device 8 and the positive pressure of the air supply unit so that the test pressure is between the negative pressure start-up test pressure and the positive pressure start-up test pressure, and observe the pressure change by maintaining the pressure for a certain period of time to judge whether the air tightness test of the breathing valve 26 is qualified.

[0041] In this embodiment, the vacuum device 8, the air supply unit 10, the ball valve 11, the needle valve 12, the valves 18 and 22, the pressure sensors 23 and 25, and the digital pressure gauge 24 are respectively connected to the control system of the breathing valve test bench.

[0042] Example 2

[0043] A test method using the breathing valve test bench of embodiment 1 for improving test efficiency comprises the following steps:

[0044] (1) Breathing valve installation: a set of breathing valves 26 are installed on the flanges 14 of each docking pipe 5, and the control gas line 15 on the test pipeline 6 is connected to the breathing valve 26;

[0045] (2) Positive pressure jump test: close the ball valve 11 on the vacuum suction pipeline 7, adjust the needle valve 12 on the air intake pipeline 9 to an appropriate opening, and use the air supply unit 10 to inflate and pressurize the breathing valve 26 through the air collecting box 4, and open the ball valve 11 on the test pipeline 6, and maintain a uniform pressure increase rate of about 0.001MPa / s during the positive pressure test process, so as to accurately collect the pressure value of the positive pressure jump of the breathing valve 26. If the pressure value deviates from the allowable deviation range, it is adjusted to meet the test requirements. After the test process is completed, the pressure in the secondary space of the air collecting box 4 is released by controlling the ball valve 11 on the exhaust branch pipe 13;

[0046] (3) Negative pressure jump test: Close the needle valve 12 on the air intake pipe 9, open the vacuum device 8 to vacuum the breathing valve 26, and check whether the pressure value of the negative pressure jump meets the specification.

[0047] In order to improve the efficiency of the test, a further improved test method is: at the initial stage of the positive pressure take-off test, the first valve 18 is also opened to quickly inflate the group of breathing valves 26, and the first valve 18 is closed in advance before the pressure in the breathing valve 26 reaches the pressure set in the test; wherein, during the rapid inflation, the control system senses the pressure change in the breathing valve 26 through the second pressure sensor 25, senses the pressure change in the main air tank 16 through the first pressure sensor 23 arranged on the main air tank 16, and dynamically controls the gas pressure in the main air tank 16 to maintain it at the pressure set in the test by controlling the second valve 22.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A breathing valve test bench for improving test efficiency, characterized in that: The invention comprises a frame, a frame platform arranged at the upper end of the frame, a number of test stations arranged on the frame platform, and an air collecting box arranged at the lower part of the frame, each of the test stations is provided with a docking pipe for installing a breathing valve, the docking pipe is connected with the interior of the air collecting box through a test pipeline, the air collecting box is connected to a vacuum pumping device through a vacuum suction pipeline, the air collecting box is connected to an air supply unit through an air intake pipeline, a ball valve is arranged on the vacuum suction pipeline, and a needle valve is arranged on the air intake pipeline; an independent main air storage box is arranged inside the air collecting box, the main air storage box occupies the main space inside the air collecting box, a secondary space is formed between the outside of the main air storage box and the inside of the air collecting box, the air supply unit is connected to the main air storage box through an air storage pipeline, and a ball valve is arranged on the vacuum suction pipeline, and a needle valve is arranged on the air intake pipeline; an independent main air storage box is arranged inside the air collecting box, the main air storage box occupies the main space inside the air collecting box, a secondary space is formed between the outside of the main air storage box and the inside of the air collecting box, the air supply unit is connected to the main air storage box through an air storage pipeline, and a secondary space is formed between the outside of the main air storage box and the inside of the air collecting box A first valve is arranged between the main space of the air box and the secondary space of the air collecting box; an independent high-pressure air tank is arranged inside the main air tank, the air supply unit is connected to the high-pressure air tank through a boosting pipeline, and a gas booster for forming the high pressure of the gas in the high-pressure air tank is arranged on the boosting pipeline, and a second valve is arranged between the high-pressure air tank and the main air tank; a first pressure sensor is arranged on the main air tank, and the second valve is an electric regulating valve. The control system of the breathing valve test bench dynamically controls the gas pressure in the main air tank to maintain the pressure set in the test through the first pressure sensor and the electric regulating valve; it also includes a pressure gauge arranged on the test pipeline and a second pressure sensor arranged on the docking pipeline for detecting the internal pressure of the breathing valve.

2. A breathing valve test bench for improving test efficiency according to claim 1, characterized in that: The test pipeline is provided with a ball valve, the air intake pipeline is provided with an exhaust branch pipe, the exhaust branch pipe is provided with a ball valve, and the docking pipeline is provided with a flange connected to the breathing valve.

3. A breathing valve test bench for improving test efficiency according to claim 1, characterized in that: The vacuum pumping device is a vacuum compressor, and the gas supply unit is a nitrogen gas supply unit.

4. A breathing valve test bench for improving test efficiency according to claim 1, characterized in that: The test pipeline is provided with a control gas circuit connected to the breathing valve, and the control gas circuit is provided with a needle valve.

5. A test method using the breathing valve test bench for improving test efficiency according to any one of claims 1 to 4, characterized in that: The steps include: (1) Breathing valve installation: Install a set of breathing valves on the flanges of each docking pipe, and connect the control gas line on the test pipeline to the breathing valve; (2) Positive pressure start-up test: close the ball valve on the vacuum suction pipeline, adjust the needle valve on the air inlet pipeline to an appropriate opening, and use the air supply unit to inflate and pressurize the breathing valve through the air collecting box, and open the ball valve on the test pipeline. Keep the pressure rise rate uniformly at about 0.001MPa / s during the positive pressure test process, so as to accurately collect the pressure value of the positive pressure start-up of the breathing valve. If the pressure value deviates from the allowable deviation range, adjust it to meet the test requirements. After the test process is completed, release the pressure in the secondary space of the air collecting box by controlling the ball valve on the exhaust branch pipe; (3) Negative pressure start test: Close the needle valve on the air intake pipe, turn on the vacuum device to vacuum the breathing valve, and check whether the negative pressure start pressure value meets the specification.

6. A test method for a breathing valve test bench for improving test efficiency according to claim 5, characterized in that: At the initial stage of the positive pressure take-off test, the first valve is also opened to quickly inflate a group of breathing valves, and the first valve is closed in advance before the pressure in the breathing valve reaches the pressure set in the test; wherein, during the rapid inflation, the control system senses the pressure change in the breathing valve through the second pressure sensor, senses the pressure change in the main air tank through the first pressure sensor provided on the main air tank, and dynamically controls the gas pressure in the main air tank to maintain at the pressure set in the test by controlling the second valve.

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