CN214121532U

CN214121532U - Valve detection system

Info

Publication number: CN214121532U
Application number: CN202022639304.6U
Authority: CN
Inventors: 李珍珍; 姜斌; 王建京
Original assignee: Xian Aerospace Yuanzheng Fluid Control Co Ltd
Current assignee: Xian Aerospace Yuanzheng Fluid Control Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-09-03
Anticipated expiration: 2030-11-13

Abstract

The utility model discloses a valve detecting system. The system comprises at least one set of detection pipeline, wherein the detection pipeline is connected with an air source, an inlet connecting end and an outlet connecting end of a valve to be detected are arranged on the detection pipeline, a mounting station of the valve to be detected is arranged between the inlet connecting end and the outlet connecting end, and the system is characterized in that the inlet connecting end is connected with the air source through a valve I; the outlet connecting end is connected with three testing pipelines, namely a first testing pipeline, a second testing pipeline and a third testing pipeline, the three testing pipelines are connected in parallel, and a first valve and a first flowmeter are connected in series on the first testing pipeline; a second valve and a second flowmeter are connected in series on the second test pipeline; and a third valve is connected in series on the third test pipeline, and the measuring ranges of the first flowmeter and the second flowmeter are different. The utility model discloses a test system can be used to test the reliability and the trouble of multiple model kind of valve, and application scope is wide and the working effect is high.

Description

Valve detection system

Technical Field

The utility model relates to a can carry out automatic clamping to low temperature economic valve product to carry out full automated inspection's test bench.

Background

When the valve with the use performance having the flow and performance requirements is subjected to the detection of the related performance of the sealing performance and the reliability, the existing detection means is more complicated and consumes long time, and particularly, the detection efficiency cannot meet the requirement of mass production of a production line.

For example, the medium of the economic valve is LNG, the working environment temperature is-162 ℃, the temperature is extremely low, and the actions are frequent, so that high requirements on the sealing performance and the reliability of the product are provided, the economic valve has good external sealing performance and internal sealing performance, and the opening and locking pressure is stable and reliable. At present, most domestic manufacturers test after connecting by using test pipelines, and manually judge whether the products are qualified, so that the human factors are more, and the production test efficiency is low.

Therefore, the test bench of the LNG low-temperature economic valve is particularly important, the production efficiency is improved, more importantly, automatic test is realized, the judgment error is eliminated, and the performance of the product is more reliable. And the test equipment also plays an important role in the development process of products, and plays a vital role in the test research of new products.

The economic valve is very critical to the factory test of the economic valve because the used medium of the economic valve is special. Every economic valve is required to carry out factory inspection of a whole project. At present, factory test of the economic valve is divided into normal temperature test and low temperature test.

And carrying out external sealing detection, opening pressure test, locking pressure test, internal sealing detection and action flexibility detection under a normal temperature test. During a conventional test, the opening pressure of the valve is set and the tightness is checked, the valve is observed through the alcohol immersion valve, the test method is complicated, the efficiency is low, and the batch-type economic valve needs high test efficiency and needs high test reliability and accuracy.

Disclosure of Invention

To prior art's defect or not enough, the utility model provides a valve detecting system.

Therefore, the utility model provides a valve test system includes at least one set of detection pipeline, detection pipeline passes through the pressure regulating valve and is connected with the air supply, be equipped with on the detection pipeline and wait to detect valve import link and wait to detect valve export link, be waiting to detect the valve installation station between import link and the export link, its characterized in that, the import link pass through valve I, the pressure regulating valve is connected with the air supply; the outlet connecting end is connected with three testing pipelines, namely a first testing pipeline, a second testing pipeline and a third testing pipeline, the three testing pipelines are connected in parallel, and a first valve and a first flowmeter are connected in series on the first testing pipeline; a second valve and a second flowmeter are connected in series on the second test pipeline; a third valve is connected in series on the third test pipeline; the first flow meter and the second flow meter have different ranges.

Further, the detection pipeline also comprises a pressure difference change test loop, and the pressure difference change test loop is connected between the valve I and the inlet connecting end.

Further, the pressure difference change testing loop comprises a valve II, a valve III, a pressure meter and a reference valve; the valve II is connected in series at the inlet connecting end and is close to the mounting station of the valve to be detected, the valve III is connected in series with the reference valve, one end of the valve III is connected with the inlet of the valve II, and the other end of the valve III is connected with the outlet of the valve II through the pressure gauge.

Furthermore, the outlet connecting end is also connected with a fourth test pipeline, the fourth test pipeline is connected with the three test pipelines in parallel, a fourth valve and a container are connected on the fourth test pipeline in series, and the port of the fourth test pipeline is communicated into the container.

Further, a silencer is connected in series on the third test pipeline.

Further, the utility model discloses a test system still includes the air supply pipeline, the air supply pipeline includes valve IV and the filter of establishing ties with the air supply, the air supply pipeline passes through pressure regulating valve and detects the tube coupling.

Further, the pressure regulating valve is connected with the detection pipeline through a safety valve.

Further, an exhaust pipeline is connected in parallel on the pressure regulating valve.

Optionally, the utility model discloses a test system includes the parallelly connected detection pipeline of at least two sets.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

the utility model discloses a test system is applicable to the valve that performance has flow and performance requirement and is carrying out leakproofness and reliability correlation performance detection, including the trouble of the different valves of test, outer leakage and internal leakage performance etc. application range is wide. And simultaneously the utility model discloses a test system can detect a plurality of products simultaneously, and work efficiency is high, is applicable to batch industrial production's valve product detection work.

Drawings

Fig. 1 is a schematic view of a testing circuit of the testing system of the present invention.

In the drawings: 1-gas source; 2-a stop valve; 3-a filter; 4-a pressure gauge; 5-a pressure reducing valve; 6-safety valve; 71. 72-a pressure sensor; 81. 82-solenoid (2-position 5-way solenoid); 911. 912, 913, 914, 921, 922, 923, 924-solenoid on-off valve (two-position two-way solenoid valve); 101. 102-a flow meter; 111. 112, 113-pressure gauge; 121. 122-a pressure sensor; 131. 132-standard economy valve; 141. 142-a flow meter; 151. 152, 153, 154-electromagnetic on-off valves; 161. 162-a water container; 171. 172-a muffler; 18-a pressure reducer; 19-a pressure relief valve; 20-a pneumatic triplet; 211. 212, 213, 214-manual shut-off valve.

Detailed Description

Unless otherwise indicated, the terms herein are to be understood in accordance with their ordinary knowledge of those skilled in the art.

Valve, including first valve, second valve, third valve, fourth valve, valve I, valve II, valve III and valve IV realize the break-make or the switching-over of return circuit according to the primary function, concrete valve basis the utility model discloses a purpose optional break-make valve or/and switching-over valve, like stop valve, electromagnetism break-make valve or electromagnetic reversing valve.

The pressure gauge is used for measuring pressure or pressure change, and specifically can select manometer, pressure sensor or differential pressure gauge etc.. Pressure regulating valve be used for adjusting pipeline pressure in the test process, its pressure control scope is confirmed according to the performance of being surveyed the valve, specific optional relief pressure valve etc..

The utility model discloses a set up three parallelly connected test tube ways in the test system, wherein the flowmeter range of first test tube way and second test tube way is different, and one of them flowmeter is the wide range, and another is the small range, and the test tube way that large-traffic flowmeter belongs to can be used as reserve or research and development test; the test pipeline where the small-flow flowmeter is located is used for detecting whether the valve to be tested has internal seal leakage or not; the third test pipeline is mainly used for detecting the action flexibility of the valve to be tested, the valve on the pipeline is repeatedly switched on and off for testing, and the flow is large during flexibility testing, so that the third test pipeline is independently arranged, and the impact flow meter is prevented from being damaged. The specific numerical values of the large range and the small range can be determined according to the performance of the valve to be tested, and the principle is that the requirements of the valve to be tested on sealing performance and research and development testing are met.

Further, for auxiliary pressure and leakproofness test, the utility model discloses a designed in the system with the parallelly connected fourth test pipeline of above-mentioned three test pipelines, this test pipeline intercommunication has container and corresponding shutoff valve on, during the test, is equipped with water in the container, and the pipeline lets in the aquatic, and the accessible is observed the bubbling condition or the frequent leakproofness of judging the valve of waiting to test in the aquatic and is carried out pressure debugging.

In the specific implementation of the method for detecting the external sealability (including the open and closed states), it has been found through experiments that the intended purpose is difficult to achieve by the conventional pressure drop method. The main reasons are two: firstly, even if the valve to be tested has leakage, the leakage rate under the general condition is very small, about 3-5 bubbles per minute, the pressure drop is still not enough to be distinguished after the conventional pressure drop method is waited for a long time, and even under the condition of continuous leakage, the pressure drop of two minutes is only 0.02 MPa; secondly, when the pressure drop method is used for testing, the waiting time is too long, at least more than 5 minutes is needed, and the efficiency is obviously too low. In the further scheme, the utility model discloses a differential pressure change method, connect pressure difference change test circuit promptly in the test pipeline, be connected with the pressure gauge in this test circuit, pressure gauge both ends are connected respectively by test valve and benchmark valve, wherein the benchmark valve is a relative detected piece is the airtight container that does not leak and exists, it fills the gas of the same pressure simultaneously to be tested valve and benchmark valve to measure preceding, after certain time interval, if there is the leak source to be tested the valve to exist, can lead to being tested the pressure change of holding the valve, and benchmark valve pressure can not change, the pressure gauge can give pressure variation, thereby realize the leak rate and measure. During specific implementation, a valve with good external sealing performance and the same type as that of a valve to be measured is used as a reference valve, a pressure gauge is connected between the reference valve and the valve to be measured on a station, after gas supply is finished, namely the front-end valve is closed, the valve to be measured and the reference valve are both closed cavities, the pressure of the inner cavities is equal, and if the valve to be measured does not leak outside, the differential pressure is zero; if the valve to be tested has a leak, the pressure difference will be displayed.

It should be noted that, for realizing the utility model discloses think about and the purpose, ensure that the process is directly perceived, technical personnel in the field can the utility model discloses test system's individual main pipeline or device side installation pressure observation instrument. For example, a pressure gauge is arranged beside the pressure reducing valve or the air source, and the pressure gauge is arranged beside the valve I.

The following is a specific embodiment provided by the utility model to explain the technical scheme of the utility model in one step.

Example (b):

referring to fig. 1, the test system pipeline structure of the embodiment includes an air source, an air source pipeline connected to the air source, and a detection pipeline connected to the air source pipeline through a pressure reducing valve 5;

the gas source pipeline comprises a stop valve 2, a filter 3 and a pressure gauge 4 which are sequentially connected in series through pipelines; the stop valve 2 is connected with the gas source 1 through a pipeline, a pressure reducing valve 5 is connected in series behind the pressure gauge 4, and a test pipeline is connected behind the pressure reducing valve 5;

a valve to be tested is arranged on the test pipeline, a mounting station 1 is arranged on the test pipeline, one side of the inlet end of the station 1 is connected with an electromagnetic valve 81, the side of the electromagnetic valve is connected with a pressure gauge 121, and further, the pressure sensor 72 can be connected for realizing automatic control; the outlet end side of the station 1 is connected with four test pipelines in parallel, wherein the first test pipeline A is connected with an electromagnetic on-off valve 911 and a large-range flow meter 101 in series, the second test pipeline B is connected with an electromagnetic on-off valve 912 and a small-range flow meter 141 in series, the third test pipeline C is connected with an electromagnetic on-off valve 913 and a silencer 171 in series, and the fourth test pipeline D is connected with an electromagnetic on-off valve 913 and a container 161 in series;

and a pressure difference change testing circuit is connected between the station 1 and the electromagnetic valve 81, and specifically comprises an electromagnetic on-off valve 151, an electromagnetic on-off valve 152, a pressure sensor 121 and a reference valve 131, wherein the electromagnetic on-off valve 151 is connected between the station 1 and the electromagnetic valve 81, the electromagnetic on-off valve 152 is connected with the reference valve 131 in series, the inlet end of the electromagnetic on-off valve 152 is connected with the inlet end of the electromagnetic on-off valve 151, and the other end of the electromagnetic on-off valve 152 is connected with the outlet end of the electromagnetic on-off valve 151 through the pressure sensor 121.

In a further scheme, in order to improve the efficiency, two sets of detection pipelines are provided, the other set of detection pipeline has the same structure as the detection pipeline, and the electromagnetic valve 82 on the other set of detection pipeline is connected with the gas source pipeline.

The testing system is adopted to test the external sealing performance, the opening pressure and the locking pressure of the economic valve product 1 and the economic valve product 2 in the opening state; and detecting the outer sealing performance in the closed state, the inner sealing performance in the closed state and the flexibility. Before detection, the product 1 and the product 2 are respectively installed as shown in figure 1, the product 1 (product 2) is installed at a valve installation station to be detected in a detection pipeline, an inlet of the product 1 (product 2) is connected with an inlet connecting end in the detection pipeline, and an outlet of the product 1 (product 2) is connected with an outlet connecting end.

The related performances or requirements of the economic valve product 1 and the economic valve product 2 are that the external seal is leak-free, the opening pressure is 1.1MPa, and the locking pressure is not less than 1.0 MPa; the outer seal has no leakage in the closed state, the inner seal has no leakage in the closed state, and the action is flexible.

According to the performance of the tested valve, on the basis of the test system, the pressure reducing valve 5 is a TESCOM ER5000 series, the pressure can be automatically adjusted and stabilized, the inaccurate adjusted pressure caused by pressure fluctuation in the pressure adjusting process is avoided, and the adjusting range is 0-2.5 MPa; the flow meter 141(142) and the flow meter 101(102) both adopt omega thermal mass flow meters, wherein the flow meter 141(142) is a small-range flow meter, and the range of the flow meter is 0-20 SCCM; the flow meter 101(102) is wide range, with a range of 0-200 SCCM.

The specific detection process is as follows (the part number in brackets below is for the detection pipeline device of product 2, the part number outside the bracket is for the detection pipeline device of product 1):

A. external seal detection in open state of economic valve

Opening the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153), the electromagnetic on-off valve 152(154), closing the electromagnetic on-off valve 911(921), the electromagnetic on-off valve 912(922), the electromagnetic on-off valve 913(923), the electromagnetic on-off valve 914(924), and stabilizing the pressure of the pressure reducing valve 5 to 1.30 MPa; the holding time is 1 minute, the system records the pressure change value of the pressure sensor 121(122), and no pressure drop is allowed (or a reasonable pressure drop range is allowed, such as less than 0.01 MPa); otherwise, the product 1 (product 2) has an external leakage phenomenon in the open state. And further, a related alarm system can be integrated in the system, and when external leakage occurs, the system performs early warning prompt.

B. Setting of the opening pressure of an economizer valve

After the external sealing detection is finished in the opening state, the set pressure setting is needed, and the specific operation is to adjust an adjusting screw on the economic valve to enable the economic valve to reach the specified flow value requirement under the specified pressure.

The specific setting process is as follows: the pressure of the reducing valve 5 is stabilized at 1.10MPa (determined according to a product to be measured), the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153) and the electromagnetic on-off valve 914(924) are opened, the electromagnetic on-off valve 152(154), the electromagnetic on-off valve 911(921), the electromagnetic on-off valve 912(922) and the electromagnetic on-off valve 913(923) are closed, the adjusting screw of the economic valve to be measured on the first path is adjusted, the flow meter 101(102) monitors the flow instantaneous value in the adjusting process, when the flow reaches 1-1.5 ml/s or 15-23 bubbles (corresponding to the flow of 1-1.5 ml/s) in the water container 161(162) every second, the opening pressure of the product 1 is adjusted, the adjusting screw is stopped, and the nut is locked. In a further scheme, the system card integrates a related automatic early warning system, and when the flow reaches the flow, the system gives an alarm or other signals.

C. Economy valve closing pressure test

Starting from 1.10MPa, gradually reducing the pressure of the pressure reducing valve 5, opening the electromagnetic valves 81(82), 151(153), 914(924), closing the electromagnetic on-off valves 152(154), 911(921), 912(922), 913(923), interpreting the flow monitored by the flow meters 141(142), and recording the pressure value of the pressure reducing valve 5 as the locking pressure value of the product 1 (product 2) when the flow value is less than or equal to 0.13ml/s and about 2 bubbles (corresponding to the flow rate of 0.13ml/s) in the water container 161(162) every second in the pressure reducing process when the pressure is reduced; and according to the performance requirement of the product 1 (product 2), the pressure value at this point is not less than 1.0MPa (the valve locking pressure is about 1.05MPa generally), if the pressure value is less than 1.0MPa, the locking performance of the valve is poor, namely the valve is not closed tightly when being closed, leakage exists, and the locking pressure of the valve to be tested is unqualified. Furthermore, a related automatic recording function and an alarm system can be integrated in the system, and when the corresponding flow is reached, automatic recording is carried out; and when external leakage exists, the system carries out early warning prompt.

D. Inner and outer seal detection in closing state of economic valve

External seal detection in the closing state of the economic valve: opening the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153), the electromagnetic on-off valve 152(154), closing the electromagnetic on-off valve 911(921), the electromagnetic on-off valve 912(922), the electromagnetic on-off valve 913(923), and the electromagnetic on-off valve 914(924) to reduce the pressure of the pressure reducing valve to 0.90 MPa; the holding time is 1 minute, the system records the pressure change value of the pressure sensor 121(122), and no pressure drop is allowed (or a reasonable pressure drop range is allowed, for example, less than 0.01MPa), otherwise, the product 1 (product 2) has an external leakage phenomenon in a closed state. And further, a related alarm system can be integrated in the system, and when external leakage occurs, the system performs early warning prompt.

And (3) internal sealing detection in the closing state of the economic valve: opening the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153), the electromagnetic on-off valve 912(922), closing the electromagnetic on-off valve 152(154), the electromagnetic on-off valve 911(921), the electromagnetic on-off valve 913(923), the electromagnetic on-off valve 914(924), keeping the pressure of the reducing valve 5 at 0.90MPa, judging whether the flow rate value exists in the flow meter 141(142) by the system, and if so, indicating that the internal leakage condition exists in the valve; if the flowmeter has no flow value, the inner seal detection is qualified. And further, a related alarm system can be integrated in the system, and when internal leakage occurs, the system performs early warning prompt.

E. Economic valve action flexibility detection

The pressure of the pressure reducing valve 5 rises to 1.20MPa (or more), the electromagnetic on-off valve 911(912), the electromagnetic on-off valve 912(922), the electromagnetic on-off valve 914(924) are closed, and the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153), the electromagnetic on-off valve 913(923) are opened; the electromagnetic on-off valve 151(153) is opened and closed 3 times (2 seconds on, 2 seconds off and 2 seconds on and 2 seconds off each time), and the flexibility of the product action is detected according to the relation between air intake and air exhaust and time.

Then, the pressure of the reducing valve 5 is reduced to 1.10MPa, the electromagnetic valve 81(82), the electromagnetic on-off valve 151(153), the electromagnetic on-off valve 912(922) are opened, the electromagnetic on-off valve 911(921), the electromagnetic on-off valve 913(923), the electromagnetic on-off valve 914(924) are closed, the flow meter 101(102) monitors the flow value under the pressure, the flow range is 1-1.5 ml/s, or 15-23 bubbles (corresponding to the flow rate is 1-1.5 ml/s) in the water container 161(162) per second, and the valve is judged to be qualified; conversely, the valve cartridge may become stuck. Furthermore, a related alarm system can be integrated in the system, and the alarm can be given when the valve core is possibly stuck.

In a further scheme, the exhaust pipelines are arranged at the front end and the rear end of the pressure regulating valve (the pressurization valve in the embodiment) so as to facilitate pipeline exhaust and prevent overpressure. Referring to fig. 1, the exhaust line specifically includes a pressure reducer 18, a pneumatic triplet 20, a pressure reducing valve 19, a shutoff valve 213, and a safety valve 62, and can control the pressure of the air supply to a suitable range for use by the cylinder; wherein the safety valve 62 performs overpressure discharge and the pneumatic triplet performs gas path water removal and oil removal.

In still some schemes, the safety valve 61 is connected in series on the test main line to avoid the over-pressure danger caused by over-high pressure. Further, in order to realize control and monitoring, the device also comprises a pressure sensor 71, a pressure gauge 111 and a manual stop valve 212, and when the pressure of the gas path exceeds a certain pressure (such as 4 MPa), the safety valve 61 discharges.

It should be noted that the pressure value adjustment, flow rate, and test duration value in the detection process are determined according to specific delivery requirements of products, and parameters and requirements of various valves in the system. For example, the pressure is determined by customer requirements, the flow rate is determined by customer requirements, the flow meter and the like, and the relevant threshold value in the detection process is determined by various requirements, debugging efficiency and the like, but is not a specific value.

Claims

1. A valve detection system comprises at least one set of detection pipeline, wherein the detection pipeline is connected with an air source through a pressure regulating valve, the detection pipeline is provided with a to-be-detected valve inlet connecting end and a to-be-detected valve outlet connecting end, and a to-be-detected valve mounting station is arranged between the inlet connecting end and the outlet connecting end; the outlet connecting end is connected with three testing pipelines, namely a first testing pipeline, a second testing pipeline and a third testing pipeline, the three testing pipelines are connected in parallel, and a first valve and a first flowmeter are connected in series on the first testing pipeline; a second valve and a second flowmeter are connected in series on the second test pipeline; a third valve is connected in series on the third test pipeline; the first flow meter and the second flow meter have different ranges.

2. The valve detection system of claim 1, wherein the detection circuit further comprises a pressure differential change test circuit connected between the valve i and the inlet connection end.

3. The valve sensing system of claim 2, wherein the differential pressure change test circuit comprises a valve ii, a valve iii, a pressure gauge, and a reference valve; the valve II is connected in series at the inlet connecting end and is close to the mounting station of the valve to be detected, the valve III is connected in series with the reference valve, one end of the valve III is connected with the inlet of the valve II, and the other end of the valve III is connected with the outlet of the valve II through the pressure gauge.

4. The valve detection system of claim 1, wherein the outlet connection end is further connected with a fourth test pipeline, the fourth test pipeline is connected with the three test pipelines in parallel, a fourth valve and a container are connected in series on the fourth test pipeline, and a port of the fourth test pipeline is communicated into the container.

5. The valve detection system of claim 1, wherein a muffler is connected in series to the third test line.

6. The valve detection system of claim 1, further comprising a gas source line comprising a valve iv and a filter in series with a gas source, the gas source line connected to the detection line through a pressure regulating valve.

7. The valve sensing system of claim 1, wherein the pressure regulating valve is connected to the sensing line through a relief valve.

8. The valve sensing system of claim 1, wherein said pressure regulating valve is connected in parallel with an exhaust line.

9. The valve detection system of claim 1, comprising at least two sets of parallel detection lines.