阅读说明：本技术 用于检测高压氢气减压阀性能的检测装置及其检测方法 (Detection device and detection method for detecting performance of high-pressure hydrogen pressure reducing valve ) 是由 许春华 朱关标 王朝 何春辉 钱志浩 赵亚丽 苏红艳 陈甲楠 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种用于检测减压阀性能的检测装置,该检测装置包括：气驱打压装置、加氢口、单向阀、35MPa高压储气瓶、过滤器、体积流量计、若干压力表、若干阀门和气体管路系统；气驱打压装置、加氢口、单向阀、第一待测高压氢气减压阀、第二待测高压氢气减压阀、各阀门、气体管路系统之间构成泄漏-锁闭检测管路；35MPa高压储气瓶、过滤器、第一待测高压氢气减压阀、第二待测高压氢气减压阀、体积流量计、各阀门、气体管路系统构成流量-压力检测管路。本发明还公开了上述检测装置的检测方法。该检测装置能够模拟实际工况,从而测得实际工况环境下的高压氢气减压阀的静态压力、稳态压力以及最大压降范围内的流量、稳态流量等性能数据,检测精准。(The invention discloses a detection device for detecting the performance of a pressure reducing valve, which comprises: the device comprises a gas drive pressurizing device, a hydrogenation port, a one-way valve, a 35MPa high-pressure gas storage cylinder, a filter, a volume flow meter, a plurality of pressure gauges, a plurality of valves and a gas pipeline system; a leakage-locking detection pipeline is formed among the gas drive pressurizing device, the hydrogenation port, the one-way valve, the first high-pressure hydrogen pressure reducing valve to be detected, the second high-pressure hydrogen pressure reducing valve to be detected, the valves and the gas pipeline system; the 35MPa high-pressure gas storage bottle, the filter, the first to-be-detected high-pressure hydrogen pressure reducing valve, the second to-be-detected high-pressure hydrogen pressure reducing valve, the volume flow meter, the valves and the gas pipeline system form a flow-pressure detection pipeline. The invention also discloses a detection method of the detection device. The detection device can simulate the actual working condition, so that the static pressure, the steady-state pressure, the flow within the maximum pressure drop range, the steady-state flow and other performance data of the high-pressure hydrogen reducing valve under the actual working condition environment can be measured, and the detection is accurate.)

1. A detection device for detecting relief pressure valve performance, its characterized in that: the method comprises the following steps: the device comprises a gas drive pressurizing device, a hydrogenation port, a one-way valve, a 35MPa high-pressure gas storage cylinder, a filter, a volume flow meter, a plurality of pressure gauges, a plurality of valves and a gas pipeline system; the valves comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve and a ninth valve;

the connecting mode of the pipeline and each component in the gas pipeline system is as follows: the gas drive pressurizing device is sequentially connected with the hydrogenation port, the one-way valve and the first valve through a first gas pipeline, and the 35MPa high-pressure gas storage cylinder is sequentially connected with the filter and the second valve through a second gas pipeline; an inlet of the third gas pipeline is respectively communicated with a first branch pipeline and a second branch pipeline, the first branch pipeline is communicated with an outlet of the first valve, and the second branch pipeline is communicated with an outlet of the second valve; an outlet of the third gas pipeline is respectively communicated with a third branch pipeline and a fourth branch pipeline, the third branch pipeline is communicated with an inlet of the first high-pressure hydrogen pressure reducing valve to be tested, and the fourth branch pipeline is communicated with an inlet of the second high-pressure hydrogen pressure reducing valve to be tested; an inlet of the fourth gas pipeline is respectively communicated with a fifth branch pipeline and a sixth branch pipeline, the fifth branch pipeline is sequentially connected with a third valve and an outlet of the first high-pressure hydrogen pressure reducing valve to be measured, and the sixth branch pipeline is sequentially connected with the fourth valve and an outlet of the second high-pressure hydrogen pressure reducing valve to be measured; a fifth valve is arranged on the fourth gas pipeline; the outlet of the fourth gas pipeline is respectively communicated with a seventh branch pipeline and an eighth branch pipeline, the seventh branch pipeline is sequentially connected with a sixth valve and a seventh valve, the pipeline unloading valve is communicated with the seventh branch pipeline positioned between the sixth valve and the seventh valve through a fifth gas pipeline, and the eighth branch pipeline is sequentially connected with the eighth valve, the volume flow meter and the ninth valve;

the pressure gauges consist of a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge and a fifth pressure gauge; the first pressure gauge is installed on the first branch pipeline or the third branch pipeline or the first gas pipeline, the second pressure gauge is installed on the second branch pipeline or the fourth branch pipeline or the second gas pipeline, the third pressure gauge is installed on the fifth branch pipeline, the fourth pressure gauge is installed on the sixth branch pipeline, and the fifth pressure gauge is installed on the fourth gas pipeline.

2. The apparatus for detecting the performance of a pressure reducing valve according to claim 1, wherein: the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve and the ninth valve are all ball valves.

3. The apparatus for detecting the performance of a pressure reducing valve according to claim 1, wherein: the pressure sensor is connected to the fourth gas pipeline through a sixth gas pipeline, and the signal output end of the pressure sensor is connected with the signal input end of the volume flow meter, so that the numerical value detected by the pressure sensor is displayed on the display screen of the volume flow meter.

4. The detection device for detecting the performance of a pressure reducing valve according to claim 1, 2 or 3, wherein: the connecting parts at the connecting parts of the corresponding pipelines in the gas pipeline system and the connecting parts at the connecting parts of the pipelines in the gas pipeline system are all ferrule joints.

5. The apparatus for detecting the performance of a pressure reducing valve according to claim 1, wherein: the 35MPa high-pressure gas storage bottle is one of a 35MPa hydrogen storage bottle or a 35MPa nitrogen storage bottle.

6. The detecting method of any one of claims 1 to 5 for detecting a detecting device for detecting a performance of a pressure reducing valve, characterized by: the detection method specifically comprises the following steps:

(1) and (3) leakage test:

a. closing the second valve, the third valve and the fourth valve, communicating the gas drive pressurizing device with a nitrogen source, starting the gas drive pressurizing device, allowing nitrogen to pass through the hydrogenation port, the check valve and the first valve and then respectively enter the first high-pressure hydrogen pressure reducing valve to be detected and the second high-pressure hydrogen pressure reducing valve to be detected, when the pressure in the gas pipeline system filled with nitrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with nitrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the device leaks or not by a bubble method every 5 MPa; stopping detecting when external leakage exists, relieving pressure, repairing a leakage point, repeating the steps, continuously pressurizing to 43.75MPa when no external leakage exists, closing the first valve, maintaining the pressure for 0.5-1 hour, observing and recording whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge change or not during pressure maintaining, and opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve to relieve the pressure after pressure maintaining is finished;

if the pressure value of the first pressure gauge is not reduced, no nitrogen is leaked, otherwise, nitrogen is leaked; if the pressure value of the third pressure gauge is not increased, the first to-be-measured high-pressure hydrogen pressure reducing valve has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor; if the pressure value of the fourth pressure gauge is not increased, the second high-pressure hydrogen pressure reducing valve to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor;

b. closing the third valve and the fourth valve, disconnecting the gas drive pressurizing device from the nitrogen source and communicating the gas drive pressurizing device with the hydrogen source, starting the gas drive pressurizing device, enabling the hydrogen to respectively enter a first high-pressure hydrogen pressure reducing valve to be tested and a second high-pressure hydrogen pressure reducing valve to be tested after passing through the hydrogenation port, the one-way valve and the first valve, and when the pressure in the gas pipeline system filled with the hydrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with the hydrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the detection device leaks or not by using a hydrogen detector every 5 MPa; stopping detection if external leakage exists, continuously pressurizing to 43.75MPa if no external leakage exists, closing the first valve, maintaining the pressure for 0.5-1 hour, and observing and recording whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge change or not during pressure maintaining;

if the pressure value of the first pressure gauge is not reduced, no hydrogen gas leaks, otherwise, hydrogen gas leaks; if the pressure value of the third pressure gauge is not increased, the first to-be-measured high-pressure hydrogen pressure reducing valve has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor; if the pressure value of the fourth pressure gauge is not increased, the second high-pressure hydrogen pressure reducing valve to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor;

(2) locking test: opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve for pressure relief, closing the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve when the pressure relief reaches 35MPa, maintaining the pressure for 48-72 hours, and observing whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge are changed or not during the pressure maintaining period; the pressure value of the first pressure gauge is an air inlet pressure value, the pressure value of the third pressure gauge is a steady state pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve, and the pressure value of the fourth pressure gauge is a steady state pressure value of the second to-be-measured high-pressure hydrogen pressure reducing valve; after the pressure maintaining is finished, opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve to release the pressure;

(3) and (3) pressure testing:

a. the 35MPa high-pressure gas storage cylinder selects a 35MPa hydrogen storage cylinder or a 35MPa nitrogen storage cylinder, a second valve is opened after all valves are closed, high-pressure hydrogen or high-pressure nitrogen in the 35MPa high-pressure gas storage cylinder respectively enters a first high-pressure hydrogen pressure reducing valve to be measured and a second high-pressure hydrogen pressure reducing valve to be measured after passing through a filter and the second valve, and pressure values of a second pressure gauge, a third pressure gauge and a fourth pressure gauge are observed and recorded; the pressure value of the second pressure gauge is the air inlet pressure value, the pressure value of the third pressure gauge is the static pressure value of the first high-pressure hydrogen pressure reducing valve to be measured, and the pressure value of the fourth pressure gauge is the static pressure value of the second high-pressure hydrogen pressure reducing valve to be measured;

b. testing a first high-pressure hydrogen reducing valve to be tested: closing the fourth valve, and opening the third valve, the fifth valve, the sixth valve and the seventh valve in sequence to carry out pressure passing test, observing and recording pressure values of the second pressure gauge and the third pressure gauge in the pressure passing test process, wherein the observation time is not less than 1 min; closing a third valve to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of a third pressure gauge in the pressure standing process and comparing the pressure value with the pressure value of the third pressure gauge in the step a in the step (3); thirdly, closing the second valve and opening the third valve for pressure relief, then closing the third valve, the fifth valve, the sixth valve and the seventh valve in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge is an air inlet pressure value, and the pressure value of the third pressure gauge is a dynamic pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve; the air inlet pressure nodes are 35MPa, 30MPa, 25MPa, 20MPa, 15MPa, 10MPa, 5MPa, 4MPa, 3MPa and 2MPa in sequence;

c. and (3) testing the second high-pressure hydrogen reducing valve to be tested: closing the third valve, and opening the fourth valve, the fifth valve, the sixth valve and the seventh valve in sequence to carry out pressure passing test, observing and recording pressure values of the second pressure gauge and the fourth pressure gauge in the pressure passing test process, wherein the observation time is not less than 1 min; closing the fourth valve to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of a fourth pressure gauge in the pressure standing process and comparing the pressure value with the pressure value of the fourth pressure gauge in the step a in the step (3); thirdly, closing the second valve and opening the fourth valve to release pressure, then closing the fourth valve, the fifth valve, the sixth valve and the seventh valve in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge is an air inlet pressure value, and the pressure value of the fourth pressure gauge is a dynamic pressure value of the second high-pressure hydrogen pressure reducing valve to be tested;

(4) and (3) flow testing:

a. carrying out flow test on the first high-pressure hydrogen reducing valve to be tested: after all the valves are closed, opening a second valve, a third valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve, and observing and recording a pressure value of a fifth pressure gauge and a flow value of a volume flowmeter; adjusting the opening of the eighth valve, and observing and recording the pressure value of the fifth pressure gauge and the flow value of the volume flowmeter when the eighth valve is respectively in different opening degrees;

b. and (3) carrying out flow test on the second high-pressure hydrogen reducing valve to be tested: after all the valves are closed, opening a second valve, a fourth valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve, and observing and recording a pressure value of a fifth pressure gauge and a flow value of a volume flowmeter; adjusting the opening of the eighth valve, and observing and recording the pressure value of the fifth pressure gauge and the flow value of the volume flowmeter when the eighth valve is respectively in different opening degrees;

c. opening a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve to enable nitrogen to continuously pass through the first high-pressure hydrogen pressure reducing valve to be tested and the second high-pressure hydrogen pressure reducing valve to be tested, and closing all the valves until the value of the second pressure gauge is reduced to a next air inlet pressure node;

(5) and (5) repeating the step (3) and the step (4), and observing and measuring the pressure value of each pressure gauge and the flow value of the volume flowmeter under different intake pressure node states.

7. The detection method of a detection device for detecting a performance of a pressure reducing valve according to claim 6, wherein: in the step b in the step (3), the observation time for pressure passing test is 1-3 min, the pressure standing time for pressure standing is 2-4 min, and the times for repeating the step I and the step II are 10-20 times; in the step c in the step (3), the observation time for pressure passing test is 1-3 min, the pressure standing time for pressure standing is 2-4 min, and the times for repeating the step I and the step II are 10-20 times.

Technical Field

The invention relates to a detection technology of a pressure reducing valve, in particular to a detection device and a detection method for detecting the performance of a high-pressure hydrogen pressure reducing valve.

Background

The vehicle-mounted hydrogen supply system is applied to fuel cell vehicles, like fuel tanks applied to traditional fuel vehicles and batteries applied to pure electric vehicles, and is an essential base stone for supporting the development of the fuel cell vehicle industry. One key step that the whole vehicle-mounted hydrogen supply system can stably supply energy to the fuel cell automobile is that after high-pressure hydrogen in a vehicle-mounted hydrogen storage bottle is subjected to pressure reduction work through a high-pressure hydrogen pressure reducing valve, a galvanic pile of the fuel cell can obtain hydrogen with relatively stable flow and stable low pressure as an energy medium, and therefore the stability of the vehicle-mounted hydrogen supply system for supplying energy to the fuel cell automobile is directly influenced by the performance of the high-pressure hydrogen pressure reducing valve.

At present, no detection device can be used for independently detecting the performance of the high-pressure hydrogen pressure reducing valve, and in the assembly process of a vehicle-mounted hydrogen supply system, the type selection of the high-pressure hydrogen pressure reducing valve can be only carried out indirectly according to parameters, technical requirements and the like provided by a high-pressure hydrogen pressure reducing valve manufacturer. After the vehicle-mounted hydrogen supply system is assembled, the static pressure of the high-pressure hydrogen pressure reducing valve can be detected when the air-tight air pressure test and pressure maintaining are carried out on the whole vehicle-mounted hydrogen supply system before leaving a factory, but other performance parameters of the high-pressure hydrogen pressure reducing valve cannot be detected. In addition, after-sales detection cannot be performed for the high-pressure hydrogen gas pressure reducing valve in the after-sales on-vehicle hydrogen supply system.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the detection device is simple to operate, accurate and comprehensive in detection and used for detecting the performance of the high-pressure hydrogen pressure reducing valve, and the detection method for detecting the high-pressure hydrogen pressure reducing valve by adopting the detection device is provided.

In order to solve the problems, the invention adopts the technical scheme that: the detection device for detecting the performance of the pressure reducing valve comprises: the device comprises a gas drive pressurizing device, a hydrogenation port, a one-way valve, a 35MPa high-pressure gas storage cylinder, a filter, a volume flow meter, a plurality of pressure gauges, a plurality of valves and a gas pipeline system; the valves comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve and a ninth valve;

the connecting mode of the pipeline and each component in the gas pipeline system is as follows: the gas drive pressurizing device is sequentially connected with the hydrogenation port, the one-way valve and the first valve through a first gas pipeline, and the 35MPa high-pressure gas storage cylinder is sequentially connected with the filter and the second valve through a second gas pipeline; an inlet of the third gas pipeline is respectively communicated with a first branch pipeline and a second branch pipeline, the first branch pipeline is communicated with an outlet of the first valve, and the second branch pipeline is communicated with an outlet of the second valve; an outlet of the third gas pipeline is respectively communicated with a third branch pipeline and a fourth branch pipeline, the third branch pipeline is communicated with an inlet of the first high-pressure hydrogen pressure reducing valve to be tested, and the fourth branch pipeline is communicated with an inlet of the second high-pressure hydrogen pressure reducing valve to be tested; an inlet of the fourth gas pipeline is respectively communicated with a fifth branch pipeline and a sixth branch pipeline, the fifth branch pipeline is sequentially connected with a third valve and an outlet of the first high-pressure hydrogen pressure reducing valve to be measured, and the sixth branch pipeline is sequentially connected with the fourth valve and an outlet of the second high-pressure hydrogen pressure reducing valve to be measured; a fifth valve is arranged on the fourth gas pipeline; the outlet of the fourth gas pipeline is respectively communicated with a seventh branch pipeline and an eighth branch pipeline, the seventh branch pipeline is sequentially connected with a sixth valve and a seventh valve, the pipeline unloading valve is communicated with the seventh branch pipeline positioned between the sixth valve and the seventh valve through a fifth gas pipeline, and the eighth branch pipeline is sequentially connected with the eighth valve, the volume flow meter and the ninth valve;

the pressure gauges consist of a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge and a fifth pressure gauge; the first pressure gauge is installed on the first branch pipeline or the third branch pipeline or the first gas pipeline, the second pressure gauge is installed on the second branch pipeline or the fourth branch pipeline or the second gas pipeline, the third pressure gauge is installed on the fifth branch pipeline, the fourth pressure gauge is installed on the sixth branch pipeline, and the fifth pressure gauge is installed on the fourth gas pipeline.

Further, in the device for detecting performance of a pressure reducing valve, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve and the ninth valve are all ball valves.

Further, in the detection apparatus for detecting performance of a pressure reducing valve, the pressure sensor is connected to the fourth gas pipeline through the sixth gas pipeline, and a signal output end of the pressure sensor is connected to a signal input end of the volumetric flowmeter, so that a value detected by the pressure sensor is displayed on a display screen of the volumetric flowmeter.

Further, in the detection device for detecting performance of the pressure reducing valve, the connecting part at the connecting position of the corresponding pipeline in the gas pipeline system and the connecting part at the connecting position of the pipeline in the gas pipeline system are all ferrule fittings.

Further, in the detection device for detecting the performance of the pressure reducing valve, the 35MPa high-pressure gas cylinder is one of a 35MPa hydrogen storage cylinder and a 35MPa nitrogen storage cylinder.

A detection method of a detection device for detecting the performance of a pressure reducing valve specifically comprises the following steps:

(1) and (3) leakage test:

a. closing the second valve, the third valve and the fourth valve, communicating the gas drive pressurizing device with a nitrogen source, starting the gas drive pressurizing device, allowing nitrogen to pass through the hydrogenation port, the check valve and the first valve and then respectively enter the first high-pressure hydrogen pressure reducing valve to be detected and the second high-pressure hydrogen pressure reducing valve to be detected, when the pressure in the gas pipeline system filled with nitrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with nitrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the device leaks or not by a bubble method every 5 MPa; stopping detecting when external leakage exists, relieving pressure, repairing a leakage point, repeating the steps, continuously pressurizing to 43.75MPa when no external leakage exists, closing the first valve, maintaining the pressure for 0.5-1 hour, observing and recording whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge change or not during pressure maintaining, and opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve to relieve the pressure after pressure maintaining is finished;

if the pressure value of the first pressure gauge is not reduced, no nitrogen is leaked, otherwise, nitrogen is leaked; if the pressure value of the third pressure gauge is not increased, the first to-be-measured high-pressure hydrogen pressure reducing valve has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor; if the pressure value of the fourth pressure gauge is not increased, the second high-pressure hydrogen pressure reducing valve to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor;

b. closing the third valve and the fourth valve, disconnecting the gas drive pressurizing device from the nitrogen source and communicating the gas drive pressurizing device with the hydrogen source, starting the gas drive pressurizing device, enabling the hydrogen to respectively enter a first high-pressure hydrogen pressure reducing valve to be tested and a second high-pressure hydrogen pressure reducing valve to be tested after passing through the hydrogenation port, the one-way valve and the first valve, and when the pressure in the gas pipeline system filled with the hydrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with the hydrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the detection device leaks or not by using a hydrogen detector every 5 MPa; stopping detection if external leakage exists, continuously pressurizing to 43.75MPa if no external leakage exists, closing the first valve, maintaining the pressure for 0.5-1 hour, and observing and recording whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge change or not during pressure maintaining;

if the pressure value of the first pressure gauge is not reduced, no hydrogen gas leaks, otherwise, hydrogen gas leaks; if the pressure value of the third pressure gauge is not increased, the first to-be-measured high-pressure hydrogen pressure reducing valve has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor; if the pressure value of the fourth pressure gauge is not increased, the second high-pressure hydrogen pressure reducing valve to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor;

(2) locking test: opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve for pressure relief, closing the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve when the pressure relief reaches 35MPa, maintaining the pressure for 48-72 hours, and observing whether the pressure values of the first pressure gauge, the third pressure gauge and the fourth pressure gauge are changed or not during the pressure maintaining period; the pressure value of the first pressure gauge is an air inlet pressure value, the pressure value of the third pressure gauge is a steady state pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve, and the pressure value of the fourth pressure gauge is a steady state pressure value of the second to-be-measured high-pressure hydrogen pressure reducing valve; after the pressure maintaining is finished, opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve to release the pressure;

(3) and (3) pressure testing:

a. the 35MPa high-pressure gas storage cylinder selects a 35MPa hydrogen storage cylinder or a 35MPa nitrogen storage cylinder, a second valve is opened after all valves are closed, high-pressure hydrogen or high-pressure nitrogen in the 35MPa high-pressure gas storage cylinder respectively enters a first high-pressure hydrogen pressure reducing valve to be measured and a second high-pressure hydrogen pressure reducing valve to be measured after passing through a filter and the second valve, and pressure values of a second pressure gauge, a third pressure gauge and a fourth pressure gauge are observed and recorded; the pressure value of the second pressure gauge is the air inlet pressure value, the pressure value of the third pressure gauge is the static pressure value of the first high-pressure hydrogen pressure reducing valve to be measured, and the pressure value of the fourth pressure gauge is the static pressure value of the second high-pressure hydrogen pressure reducing valve to be measured;

b. testing a first high-pressure hydrogen reducing valve to be tested: closing the fourth valve, and opening the third valve, the fifth valve, the sixth valve and the seventh valve in sequence to carry out pressure passing test, observing and recording pressure values of the second pressure gauge and the third pressure gauge in the pressure passing test process, wherein the observation time is not less than 1 min; closing a third valve to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of a third pressure gauge in the pressure standing process and comparing the pressure value with the pressure value of the third pressure gauge in the step a in the step (3); thirdly, closing the second valve and opening the third valve for pressure relief, then closing the third valve, the fifth valve, the sixth valve and the seventh valve in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge is an air inlet pressure value, and the pressure value of the third pressure gauge is a dynamic pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve; the air inlet pressure nodes are 35MPa, 30MPa, 25MPa, 20MPa, 15MPa, 10MPa, 5MPa, 4MPa, 3MPa and 2MPa in sequence;

c. and (3) testing the second high-pressure hydrogen reducing valve to be tested: closing the third valve, and opening the fourth valve, the fifth valve, the sixth valve and the seventh valve in sequence to carry out pressure passing test, observing and recording pressure values of the second pressure gauge and the fourth pressure gauge in the pressure passing test process, wherein the observation time is not less than 1 min; closing the fourth valve to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of a fourth pressure gauge in the pressure standing process and comparing the pressure value with the pressure value of the fourth pressure gauge in the step a in the step (3); thirdly, closing the second valve and opening the fourth valve to release pressure, then closing the fourth valve, the fifth valve, the sixth valve and the seventh valve in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge is an air inlet pressure value, and the pressure value of the fourth pressure gauge is a dynamic pressure value of the second high-pressure hydrogen pressure reducing valve to be tested;

(4) and (3) flow testing:

a. carrying out flow test on the first high-pressure hydrogen reducing valve to be tested: after all the valves are closed, opening a second valve, a third valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve, and observing and recording a pressure value of a fifth pressure gauge and a flow value of a volume flowmeter; adjusting the opening of the eighth valve, and observing and recording the pressure value of the fifth pressure gauge and the flow value of the volume flowmeter when the eighth valve is respectively in different opening degrees;

b. and (3) carrying out flow test on the second high-pressure hydrogen reducing valve to be tested: after all the valves are closed, opening a second valve, a fourth valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve, and observing and recording a pressure value of a fifth pressure gauge and a flow value of a volume flowmeter; adjusting the opening of the eighth valve, and observing and recording the pressure value of the fifth pressure gauge and the flow value of the volume flowmeter when the eighth valve is respectively in different opening degrees;

c. opening a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, an eighth valve and a ninth valve to enable nitrogen to continuously pass through the first high-pressure hydrogen pressure reducing valve to be tested and the second high-pressure hydrogen pressure reducing valve to be tested, and closing all the valves until the value of the second pressure gauge is reduced to a next air inlet pressure node;

(5) and (5) repeating the step (3) and the step (4), and observing and measuring the pressure value of each pressure gauge and the flow value of the volume flowmeter under different intake pressure node states.

Further, in the detection method of the detection device for detecting the performance of the pressure reducing valve, in the step b in the step (3), the observation time for pressure passing test is 1-3 min, the pressure standing time for pressure standing is 2-4 min, and the times of repeating the step (i) and the step (ii) are 10-20 times; in the step c in the step (3), the observation time for pressure passing test is 1-3 min, the pressure standing time for pressure standing is 2-4 min, and the times for repeating the step I and the step II are 10-20 times.

The invention has the beneficial effects that: the detection device can simulate the actual working condition, so that the static pressure, the steady-state pressure, the flow, the steady-state flow and other performance data of the high-pressure hydrogen pressure reducing valve in the actual working condition environment or in the maximum pressure drop range can be measured, the detection is accurate, and an operator can conveniently match the high-pressure hydrogen pressure reducing valve which can meet the parameter requirements of hydrogen pile feeding pressure, pile feeding flow and the like in a vehicle-mounted hydrogen supply system; the application range is wide, and two groups of new high-pressure hydrogen pressure reducing valves can be synchronously detected and compared pairwise, so that the high-pressure hydrogen pressure reducing valves can be used as bases for judging the practical performance of new products; and the new and old high-pressure hydrogen reducing valves can be synchronously detected and compared pairwise, so that the new and old high-pressure hydrogen reducing valves can be used as a basis for judging the performance failure of the old products.

Drawings

Fig. 1 is a schematic diagram of a detection device for detecting the performance of a high-pressure hydrogen pressure reducing valve according to the present invention.

Fig. 2 is a schematic view of the leak-lock detection circuit of fig. 1.

Fig. 3 is a schematic diagram of the flow-pressure sensing circuit of fig. 1.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

Example one

As shown in fig. 1, the detecting device for detecting the performance of the pressure reducing valve according to the present embodiment includes: the device comprises a gas drive pressurizing device 1, a hydrogenation port 2, a one-way valve 71, a 35MPa high-pressure gas storage bottle 3, a filter 4, a volume flow meter 6, a plurality of pressure gauges, a plurality of valves and a gas pipeline system. The valves are composed of a first valve 72, a second valve 73, a third valve 74, a fourth valve 75, a fifth valve 76, a sixth valve 77, a seventh valve 79, an eighth valve 710, and a ninth valve 711.

As shown in fig. 1, 2 and 3, the connection mode of the pipeline in the gas pipeline system and each component part is as follows: the gas drive pressurizing device 1 is sequentially connected with the hydrogenation port 2, the check valve 71 and the first valve 81 through a first gas pipeline 91, and the 35MPa high-pressure gas storage cylinder 3 is sequentially connected with the filter 4 and the second valve 82 through a second gas pipeline 92. The inlet of the third gas line 93 communicates with a first branch line 931 and a second branch line 932, respectively, the first branch line 931 communicates with the outlet of the first valve 81, and the second branch line 932 communicates with the outlet of the second valve 73; an outlet of the third gas pipeline 93 is respectively communicated with a third branch pipeline 933 and a fourth branch pipeline 934, the third branch pipeline 933 is communicated with an inlet of the first high-pressure hydrogen pressure reducing valve 51 to be tested, and the fourth branch pipeline 934 is communicated with an inlet of the second high-pressure hydrogen pressure reducing valve 52 to be tested. An inlet of the fourth gas pipeline 94 is respectively communicated with a fifth branch pipeline 941 and a sixth branch pipeline 942, the fifth branch pipeline 941 is sequentially connected with the third valve 74 and an outlet of the first to-be-measured high-pressure hydrogen reducing valve 51, and the sixth branch pipeline 942 is sequentially connected with the fourth valve 75 and an outlet of the second to-be-measured high-pressure hydrogen reducing valve 52; a fifth valve 76 is provided on the fourth gas line 94; the outlet of the fourth gas line 94 is communicated with a seventh branch line 943 and an eighth branch line 944, the seventh branch line 943 is connected to the sixth valve 77 and the seventh valve 79 in this order, the line unloading valve 78 is communicated with the seventh branch line 943 located between the sixth valve 77 and the seventh valve 79 via a fifth gas line 95, and the eighth branch line 944 is connected to the eighth valve 710, the volumetric flowmeter 6, and the ninth valve 711 in this order.

The pressure gauges consist of a first pressure gauge 81, a second pressure gauge 82, a third pressure gauge 83, a fourth pressure gauge 84 and a fifth pressure gauge 85; the first pressure gauge 81 is installed on the first branch line 931 or the third branch line 933 or the first gas line 91, the second pressure gauge 82 is installed on the second branch line 932 or the fourth branch line 934 or the second gas line 92, the third pressure gauge 83 is installed on the fifth branch line 941, the fourth pressure gauge 84 is installed on the sixth branch line 942, and the fifth pressure gauge 85 is installed on the fourth gas line 94.

The first gas pipeline 91 provided with the gas drive pressurizing device 1, the hydrogen addition port 2, the check valve 71, the first valve 81, the first branch pipeline 931, the third gas pipeline 93, the third branch pipeline 933 connected to the first to-be-measured high-pressure hydrogen reducing valve 51, the fourth branch pipeline 934 connected to the second to-be-measured high-pressure hydrogen reducing valve 52, the fifth branch pipeline 941 provided with the third valve 74, the sixth branch pipeline 942 provided with the fourth valve 75, the fourth gas pipeline 94 provided with the fifth valve 76, and the seventh branch pipeline 943 provided with the sixth valve 77 and the seventh valve 79 constitute a leak-lock detection pipeline, and the schematic diagram of the principle is shown in fig. 2.

The second gas pipeline 92 provided with the 35MPa high-pressure gas cylinder 3, the filter 4 and the second valve 73, the second branch pipeline 932, the third gas pipeline 93, the third branch pipeline 933 connected with the first to-be-measured high-pressure hydrogen pressure reducing valve 51, the fourth branch pipeline 934 connected with the second to-be-measured high-pressure hydrogen pressure reducing valve 52, the fifth branch pipeline 941 provided with the third valve 74, the sixth branch pipeline 942 provided with the fourth valve 75, the fourth gas pipeline 94 provided with the fifth valve 76, the seventh branch pipeline 943 provided with the sixth valve 77 and the seventh valve 79, the eighth branch pipeline 944 provided with the eighth valve 710, the volume flow meter 6 and the ninth valve 711 form a flow-pressure detection pipeline, and the schematic diagram of the principle is shown in fig. 3.

The first valve 72, the second valve 73, the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77, the seventh valve 79, the eighth valve 710, and the ninth valve 711 may adopt needle valves or valves with other structures, but in order to further reduce the pipe resistance and improve the detection accuracy, ball valves are preferably adopted for the first valve 72, the second valve 73, the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77, the seventh valve 79, the eighth valve 710, and the ninth valve 711 in this embodiment.

As shown in fig. 1 and 3, the pressure sensor 86 is connected to the fourth gas line 94 through a sixth gas line 96, and a signal output end of the pressure sensor 86 is connected to a signal input end of the volumetric flowmeter 6, so that a value detected by the pressure sensor 86 is displayed on a display screen of the volumetric flowmeter 6, and an operator can observe the value detected by the pressure sensor 86 more intuitively. Since the value detected by the pressure sensor 86 is the same as the value detected by the fifth pressure gauge 85, the value of the fifth pressure gauge 85 can be directly read from the display screen of the volumetric flowmeter 6.

In this embodiment, the connecting part at the corresponding pipeline joint of each component and the gas pipeline system and the connecting part at the pipeline joint of the gas pipeline system are both connected by the ferrule, so as to improve the sealing connection performance at the corresponding pipeline joint of each component and the gas pipeline system and the sealing connection performance at the pipeline joint of the gas pipeline system.

In this embodiment, the 35MPa high-pressure gas cylinder 3 may be a 35MPa hydrogen storage cylinder storing 35MPa high-pressure hydrogen or a 35MPa nitrogen storage cylinder storing 35MPa high-pressure nitrogen, and in this embodiment, the 35MPa high-pressure gas cylinder is preferably a 35MPa nitrogen storage cylinder.

Example two

Referring to fig. 1, fig. 2 and fig. 3, a detection method of a detection apparatus for detecting performance of a pressure reducing valve according to the present embodiment specifically includes the following steps:

(1) and (3) leakage test:

a. closing the second valve 73, the third valve 74 and the fourth valve 75 to communicate the gas drive pressurizing device 1 with a nitrogen source, starting the gas drive pressurizing device 1, enabling nitrogen to respectively enter the first high-pressure hydrogen reducing valve 51 to be tested and the second high-pressure hydrogen reducing valve 52 to be tested after passing through the hydrogenation port 2, the check valve 71 and the first valve 72, and when the pressure in the gas pipeline system filled with nitrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with nitrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the detection device leaks outside by a bubble method every 5 MPa:

the leakage point of the external leakage is usually at the joint of the inlet of the first to-be-detected high-pressure hydrogen pressure reducing valve 51 and the third branch pipeline 933, the joint of the outlet of the first to-be-detected high-pressure hydrogen pressure reducing valve 51 and the fifth branch pipeline 941, the joint of the inlet of the second to-be-detected high-pressure hydrogen pressure reducing valve 52 and the fourth branch pipeline 934, and the joint of the outlet of the second to-be-detected high-pressure hydrogen pressure reducing valve 52 and the sixth branch pipeline 942, and the aforementioned steps are repeated after the detection is stopped and the leakage point is repaired by pressure relief if the external leakage exists; and if no leakage exists, continuously pressurizing to 43.75MPa, closing the first valve 72, maintaining the pressure for 0.5-1 hour, observing and recording whether the pressure values of the first pressure gauge 81, the third pressure gauge 83 and the fourth pressure gauge 84 are changed or not during pressure maintaining, and opening the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77 and the seventh valve 79 for pressure relief after pressure maintaining is finished.

If the pressure value of the first pressure gauge 81 is not reduced, no nitrogen gas leaks, otherwise, leakage exists. If the pressure value of the third pressure gauge 83 is not increased, it indicates that the first to-be-measured high-pressure hydrogen pressure reducing valve 51 has good pressure stabilization performance, and otherwise, the pressure stabilization performance is poor. If the pressure value of the fourth pressure gauge 84 is not increased, it indicates that the second high-pressure hydrogen pressure reducing valve 52 to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor.

b. Closing the third valve 74 and the fourth valve 75 to disconnect the gas drive pressurizing device 1 from the nitrogen source and communicate with the hydrogen source, starting the gas drive pressurizing device 1, allowing hydrogen to pass through the hydrogenation port 2, the check valve 71 and the first valve 72 and then respectively enter the first high-pressure hydrogen reducing valve 51 to be tested and the second high-pressure hydrogen reducing valve 52 to be tested, when the pressure in the gas pipeline system filled with hydrogen reaches 2MPa, gradually increasing the pressure in the gas pipeline system filled with hydrogen from 2MPa to 40MPa, wherein the pressure increasing rate is 2MPa/min, and detecting whether the detection device leaks or not by using a hydrogen detector every 5 MPa:

and stopping detection if external leakage exists, continuously pressurizing to 43.75MPa if no external leakage exists, closing the first valve, maintaining the pressure for 0.5-1 hour, and observing and recording whether the pressure values of the first pressure gauge 81, the third pressure gauge 83 and the fourth pressure gauge 84 are changed or not during pressure maintaining.

The nitrogen is used to ensure that large leakage existing in the detection device can be detected and leakage points can be repaired on the premise of higher safety, and then hydrogen is used to perform more detailed leakage detection and detect small leakage in the detection device. If the pressure value of the first pressure gauge 81 is not reduced, no hydrogen gas leaks, otherwise, hydrogen gas leaks. If the pressure value of the third pressure gauge 83 is not increased, it indicates that the first to-be-measured high-pressure hydrogen pressure reducing valve 51 has good pressure stabilization performance, and otherwise, the pressure stabilization performance is poor. If the pressure value of the fourth pressure gauge 84 is not increased, it indicates that the second high-pressure hydrogen pressure reducing valve 52 to be tested has good pressure stabilizing performance, otherwise, the pressure stabilizing performance is poor.

(2) Locking test: opening a third valve 74, a fourth valve 75, a fifth valve 76, a sixth valve 77 and a seventh valve 79 for pressure relief, closing the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77 and the seventh valve 79 when the pressure relief reaches 35MPa, maintaining the pressure for 48-72 hours, and observing whether the pressure values of a first pressure gauge 81, a third pressure gauge 83 and a fourth pressure gauge 84 are changed or not during the pressure maintenance period; the pressure value of the first pressure gauge 81 is an intake pressure value, the pressure value of the third pressure gauge 83 is a steady-state pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve 51, and the pressure value of the fourth pressure gauge 84 is a steady-state pressure value of the second to-be-measured high-pressure hydrogen pressure reducing valve 52; after the pressure holding is finished, the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77 and the seventh valve 79 are opened to perform pressure releasing.

During the pressure maintaining period, whether the pressure value variation ranges of the first pressure gauge 81, the third pressure gauge 83 and the fourth pressure gauge 84 fall within the qualified range is observed and judged, and the qualified range is usually determined according to the requirements of actual use.

(3) And (3) pressure testing:

a. the 35MPa high-pressure gas storage bottle 3 selects a 35MPa hydrogen storage bottle or a 35MPa nitrogen storage bottle, the second valve 73 is opened after all valves are closed, high-pressure hydrogen or high-pressure nitrogen in the 35MPa high-pressure gas storage bottle 3 respectively enters the first high-pressure hydrogen pressure reducing valve 51 to be measured and the second high-pressure hydrogen pressure reducing valve 52 to be measured after passing through the filter 4 and the second valve 73, and the pressure values of the second pressure gauge 82, the third pressure gauge 83 and the fourth pressure gauge 84 are observed and recorded; the pressure value of the second pressure gauge 82 is the intake pressure value, the pressure value of the third pressure gauge 83 is the static pressure value of the first to-be-measured high-pressure hydrogen pressure reducing valve 51, and the pressure value of the fourth pressure gauge 84 is the static pressure value of the second to-be-measured high-pressure hydrogen pressure reducing valve 52.

b. Testing a first high-pressure hydrogen reducing valve to be tested: closing the fourth valve, and opening the third valve 74, the fifth valve 76, the sixth valve 77 and the seventh valve 79 in sequence to carry out pressure passing test, observing and recording pressure values of the second pressure gauge 82 and the third pressure gauge 83 in the pressure passing test process, wherein the observation time is not less than 1 min; closing the third valve 74 to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of the third pressure gauge 83 in the pressure standing process and comparing the pressure value with the pressure value of the third pressure gauge 83 in the step a in the step (3); thirdly, closing the second valve 73 and opening the third valve 74 to release pressure, then closing the third valve 74, the fifth valve 76, the sixth valve 77 and the seventh valve 79 in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge 82 is the intake pressure value, and the pressure value of the third pressure gauge 83 is the dynamic pressure value of the first to-be-measured high-pressure hydrogen reducing valve 51.

When the dynamic pressure value detected by the third pressure gauge 83 is compared with the static pressure value detected by the third pressure gauge 83 in step a in step (3), whether the difference range between the two values falls into the qualified range is determined, and the qualified range is usually determined according to the requirement of actual use.

In the embodiment, the intake pressure nodes are 35MPa, 30MPa, 25MPa, 20MPa, 15MPa, 10MPa, 5MPa, 4MPa, 3MPa and 2MPa in sequence.

In the step, the observation time for pressure passing test is preferably 1-3 min, the pressure standing time for pressure standing is preferably 2-4 min, and the times for repeating the first step and the second step are 10-20 times.

c. And (3) testing the second high-pressure hydrogen reducing valve to be tested: closing the third valve 74, and opening the fourth valve 75, the fifth valve 76, the sixth valve 77 and the seventh valve 79 in sequence to carry out pressure passing test, observing and recording the pressure values of the second pressure gauge 82 and the fourth pressure gauge 84 in the pressure passing test process, wherein the observation time is not less than 1 min; closing the fourth valve 75 to perform pressure standing, wherein the pressure standing time is not less than 2min, and observing the pressure value of the fourth pressure gauge 84 in the pressure standing process and comparing the pressure value with the pressure value of the fourth pressure gauge 84 in the step a in the step (3); thirdly, closing the second valve 73 and opening the fourth valve 75 to release pressure, then closing the fourth valve 75, the fifth valve 76, the sixth valve 77 and the seventh valve 79 in sequence, and repeating the first step and the second step under the same air inlet pressure node, wherein the repetition frequency is not less than 10 times; the pressure value of the second pressure gauge 82 is the intake pressure value, and the pressure value of the fourth pressure gauge 84 is the dynamic pressure value of the second high-pressure hydrogen reducing valve 52 to be tested.

When the dynamic pressure value detected by the fourth pressure gauge 84 is compared with the static pressure value detected by the fourth pressure gauge 84 in step a in step (3), whether the difference range between the dynamic pressure value and the static pressure value falls into an acceptable range is determined, and the acceptable range is usually determined according to the requirement of actual use.

In the step, the observation time for pressure passing test is preferably 1-3 min, the pressure standing time for pressure standing is preferably 2-4 min, and the times for repeating the first step and the second step are 10-20 times.

(4) And (3) flow testing:

a. the first high-pressure hydrogen reducing valve 51 to be measured is subjected to flow rate test: after all the valves are closed, the second valve 73, the third valve 74, the fifth valve 76, the sixth valve 77, the eighth valve 710 and the ninth valve 711 are opened, and the pressure value of the fifth pressure gauge 85 and the flow value of the volume flowmeter 6 are observed and recorded; the opening degree of the eighth valve 710 is adjusted, and the pressure value of the fifth pressure gauge 85 and the flow rate value of the volumetric flowmeter 6 when the eighth valve 710 is respectively at different opening degrees are observed and recorded.

When the eighth valve 710 is fully opened, i.e., at the maximum opening, the volume flow meter 6 displays a flow value equal to the limit flow of the first to-be-measured high-pressure hydrogen pressure reducing valve 51.

When the pressure sensor 86 is connected to the fourth gas line 94 through the sixth gas line 96, and the signal output terminal of the pressure sensor 86 is connected to the signal input terminal of the volumetric flowmeter 6, so that the value detected by the pressure sensor 86 is displayed on the display screen of the volumetric flowmeter 6, the value detected by the pressure sensor 86 is the same as the value detected by the fifth pressure gauge 85, because the value of the fifth pressure gauge 85 can be directly read from the display screen of the volumetric flowmeter 6.

Here, the sixth valve 77 is opened to perform pressure relief through the pipeline relief valve 78 when the pressure in the gas pipeline system rises instantaneously, one is to perform a pressure protection function, and the other is to prevent inaccurate measurement data of the volume flow meter due to the instantaneous rise of the pressure.

Connect filter 4 in the exit of 35MPa high pressure gas bomb 3 here, the purpose is that filter 4 can increase the pipe resistance, makes the flow reduce to make detection device can be close to operating condition more, can simulate actual working environment better, thereby improve the accuracy nature that detects.

b. And (3) carrying out flow test on the second high-pressure hydrogen reducing valve 52 to be tested: after all the valves are closed, the second valve 73, the fourth valve 75, the fifth valve 76, the sixth valve 77, the eighth valve 710 and the ninth valve 711 are opened, and the pressure value of the fifth pressure gauge 85 and the flow value of the volume flowmeter 6 are observed and recorded; the opening degree of the eighth valve 710 is adjusted, and the pressure value of the fifth pressure gauge 85 and the flow rate value of the volumetric flowmeter 6 when the eighth valve 710 is respectively at different opening degrees are observed and recorded.

When the eighth valve 710 is fully opened, that is, at the maximum opening, the volume flow meter 6 displays the flow value as the limit flow of the second high-pressure hydrogen reducing valve 52 to be tested.

c. And opening the second valve 73, the third valve 74, the fourth valve 75, the fifth valve 76, the sixth valve 77, the eighth valve 710 and the ninth valve 711, so that the nitrogen continuously passes through the first high-pressure hydrogen reducing valve 51 to be tested and the second high-pressure hydrogen reducing valve 52 to be tested, and closing all the valves after the pressure value of the second pressure gauge 82 is reduced to the next inlet pressure node.

Wherein the air inlet pressure nodes are 35MPa, 30MPa, 25MPa, 20MPa, 15MPa, 10MPa, 5MPa, 4MPa, 3MPa and 2MPa in sequence.

(5) And (5) repeating the step (3) and the step (4), and observing and measuring the pressure value of each pressure gauge and the flow value of the volume flowmeter under different intake pressure node states. Wherein the air inlet pressure nodes are 35MPa, 30MPa, 25MPa, 20MPa, 15MPa, 10MPa, 5MPa, 4MPa, 3MPa and 2MPa in sequence.

Wherein, the steady state pressure is that in the process of flow measurement, the pressure does not obviously fluctuate within 1min when the flow is measured within 10% pressure drop (the fluctuation range is within +/-3% of the current pressure value); wherein the pressure drop is the ratio of (ultimate pressure value-static pressure value) to the static pressure.

The steady state flow is: and (3) the flow value output in the steady-state pressure and the flow within 1min are not obviously fluctuated in the flow measurement (the fluctuation amplitude under the nitrogen working condition is +/-20 SLPM of the current flow value, and the SLPM is the flow rate unit, namely standard liters per minute).

The concept of "limit flow" is introduced, that is, the valve in the test pipeline is directly fully opened without controlling the pressure to make the flow maximum, but the pressure drop is certainly over 10%, in the flow test of 3-35MPa, the pressure (i.e. the limit pressure) corresponding to the limit flow should be between 20% -25%, and the pressure can also be used as a reference data (not used as a main parameter) for judging the quality of the pressure reducing valve.

The flow within the maximum pressure drop range is the corresponding steady state maximum flow at a value of 10% pressure drop.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made in accordance with the technical spirit of the present invention are within the scope of the present invention as claimed.

The invention has the advantages that: the detection device can simulate the actual working condition, so that the static pressure, the steady-state pressure, the flow, the steady-state flow and other performance data of the high-pressure hydrogen pressure reducing valve in the actual working condition environment or in the maximum pressure drop range can be measured, the detection is accurate, and an operator can conveniently match the high-pressure hydrogen pressure reducing valve which can meet the parameter requirements of hydrogen pile feeding pressure, pile feeding flow and the like in a vehicle-mounted hydrogen supply system; the application range is wide, and two groups of new high-pressure hydrogen pressure reducing valves can be synchronously detected and compared pairwise, so that the high-pressure hydrogen pressure reducing valves can be used as bases for judging the practical performance of new products; and the new and old high-pressure hydrogen reducing valves can be synchronously detected and compared pairwise, so that the new and old high-pressure hydrogen reducing valves can be used as a basis for judging the performance failure of the old products.