Device and method for measuring working pressure and leak rate of pressure regulator

Abstract

The invention belongs to the technical field of life support systems, and particularly relates to a working pressure and leak rate measuring device and method of a pressure regulator. The device comprises an air source, a pressure reducing valve, a three-way regulating valve, a flow control unit, a three-way connector and a containing cavity which are sequentially connected. A pressure gauge is mounted in the accommodating cavity; the flow control unit comprises a first control unit and a second control unit which are connected in parallel; the flow control ranges of the first control unit and the second control unit are different orders of magnitude; and a tested pressure regulator is arranged on the interface of the accommodating cavity.

Description

Technical Field

[0001] The invention belongs to the technical field of life support systems, and in particular relates to a device and method for measuring the working pressure and leakage rate of a pressure regulator. Background Art

[0002] The pressure regulator is a pressure control device for low-gravity simulation training suits. When a pressure emergency occurs during the flight of a spacecraft and the pressure in the cabin decreases, it can automatically control the space suit in the cabin to have a specified absolute pressure in cooperation with the spacecraft oxygen supply system. During the landing of the return capsule, when the pressure suit in the cabin is closed, the product automatically ensures that the space suit in the cabin is connected to the inside and outside to meet the astronauts' breathing requirements. Under normal pressure, close the product and perform a pressurization test on the space suit in the cabin. If the residual pressure exceeds the specified value, the product can automatically release the pressure and serve as a safety valve.

[0003] Currently, there is no suitable device and method to measure the working pressure and leakage rate of the pressure regulator. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for measuring the working pressure and leakage rate of a pressure regulator. The device has the function of measuring and regulating the system pressure, system ventilation flow and system leakage rate, and can be applied to the measurement and regulation of the working pressure (opening pressure, maintaining pressure, closing pressure), ventilation flow and system leakage rate of the pressure regulator of a low-gravity simulation training suit.

[0005] Technical Solution

[0006] A working pressure and leakage rate measuring device of a pressure regulator, comprising: an air source, a pressure reducing valve, a three-way regulating valve, a flow control unit, a three-way joint and a chamber connected in sequence;

[0007] A pressure gauge is installed in the chamber;

[0008] The flow control unit includes a first control unit and a second control unit connected in parallel; the flow control ranges of the first control unit and the second control unit are of different orders of magnitude;

[0009] The pressure regulator to be tested is installed on the interface of the chamber.

[0010] Furthermore, the first control unit includes: a stop valve 1 and a mass flow meter, the working range of the mass flow meter is 0L / min to 30L / min, and the adjustment accuracy is 0.45L / min.

[0011] Furthermore, the second control unit includes: a stop valve 2 and a rotor flowmeter, the working range of the rotor flowmeter is 0 mL / min to 30 mL / min, and the adjustment accuracy is 3 mL / min.

[0012] Further, the volume of the cavity is L±10%L;

[0013] L is the volume of the low-gravity simulation training suit with the pressure regulator installed.

[0014] A method for measuring the working pressure and leakage rate of a pressure regulator, the method is implemented based on the device, and the method process is as follows:

[0015] Install the pressure regulator on the chamber and adjust the pressure reducing valve so that the outlet pressure of the pressure reducing valve does not exceed the pressure resistance of the subsequent pipeline;

[0016] Control the three-way regulating valve and stop valve 1 to open, and stop valve 2 to close; measure the working pressure of the pressure regulator;

[0017] Open the three-way regulating valve and stop valve 2, and close the stop valve 1; measure the leakage rate of the pressure regulator.

[0018] Furthermore, the working pressure of the pressure regulator includes: opening pressure, maintaining pressure and closing pressure.

[0019] Furthermore, the process of measuring the working pressure of the pressure regulator is as follows: adjust the three-way regulating valve so that the mass flow meter indicates K1 L / min; keep pressurizing the chamber until the valve of the pressure regulator opens, and record the pressure indication value at this time as the opening pressure of the pressure regulator;

[0020] Continue to supply gas and pressurize the chamber until the pressure indication value remains unchanged, and record the pressure at this time as the pressure maintained by the pressure regulator;

[0021] Close the stop valve 1, stop pressurizing the chamber, and wait for the valve of the pressure regulator to close. The pressure indicated at the moment of closing is the closing pressure of the pressure regulator;

[0022] Further, the leak rate measurement process of the pressure regulator is as follows: adjust the three-way flow valve so that the rotor flowmeter reading is K2 mL / min;

[0023] Read the pressure indication value once every minute. If the indication value rises, the leakage rate of the pressure regulator is less than K2 mL / min. If the indication value drops, the leakage rate of the pressure regulator is greater than K2 mL / min. If the indication value remains unchanged, the leakage rate of the pressure regulator is equal to K2 mL / min.

[0024] The technical effects of the present invention are:

[0025] The present invention provides a device and method for measuring the working pressure and leakage rate of a pressure regulator. It has been verified that the device has the convenient regulation and testing functions of the opening pressure, maintaining pressure, closing pressure, ventilation flow and system leakage rate of the pressure regulator of a low-gravity simulation training suit. The low-gravity simulation training suit pressure regulator tested and accepted by the device can meet the requirements of relevant specifications and has passed the assessment test, and can meet the use requirements of the low-gravity simulation training suit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of a working pressure and leakage rate measuring device of a pressure regulator. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] The invention relates to a device and method for measuring the working pressure and leakage rate of a pressure regulator.

[0029] The pressure regulator is a pressure control device for the low-gravity simulation training suit. Under normal pressure, the product is closed and the low-gravity simulation training suit is pressurized for a test. If the residual pressure exceeds the specified value, the product can automatically release the pressure and function as a safety valve.

[0030] Pressure regulator performance index requirements:

[0031] 1) When the oxygen supply flow rate is K1 NL / min, when the residual pressure of the clothing reaches P kPa, the valve automatically opens to release the pressure;

[0032] 2) When the oxygen supply flow rate is K1 NL / min, the pressure is maintained at no more than P1 kPa (P1>P);

[0033] 3) After stopping the oxygen supply, the valve closing pressure should be no less than P2 kPa (P2<P).

[0034] 4) The leakage rate should not exceed K2 mL / min at a residual pressure of P2 kPa.

[0035] The present invention aims to solve the problem of convenient measurement and regulation of the opening pressure, maintaining pressure, closing pressure, ventilation flow rate and system leakage rate of a pressure regulator of a low-gravity simulation training suit.

[0036] The schematic diagram of the device is shown in Figure 1The device is mainly composed of a pressure reducing valve, a three-way regulating valve, a stop valve, a mass flow meter, a rotor flow meter, a tee, a cavity of a simulated low-gravity simulation training suit, and a pressure gauge. The pressure reducing valve is connected to the gas source through a pipeline. The pressure reducing valve can adjust the gas supply pressure to within the pressure resistance range of the subsequent pipeline. The three-way regulating valve is connected in series with the pressure reducing valve, and can adjust the gas flow of the subsequent flow control unit. After the first control unit is connected in parallel with the second control unit (the first control unit is composed of a stop valve 1 and a mass flow meter connected in series, and the second control unit is composed of a stop valve 2 and a rotor flow meter connected in series), one end is connected to the three-way regulating valve, and the other end is connected to the tee respectively. The cavity is connected in series with the tee, and the pressure gauge and the pressure regulator are respectively installed on the interface on the cavity.

[0037] The measurement method is as follows:

[0038] 1) Install the pressure regulator on the chamber and adjust the pressure reducing valve to make the system gas supply pressure meet the product regulation requirements. Open the three-way regulating valve and stop valve 1, close stop valve 2, ventilate and pressurize the chamber, adjust the three-way regulating valve so that the mass flow meter indicates K1 L / min. When the internal valve of the pressure regulator opens, the pressure gauge indicates the opening pressure P of the pressure regulator;

[0039] 2) Maintain the gas supply flow rate K1 L / min and continue to pressurize the chamber. When the pressure gauge indication value remains unchanged, the pressure indication value is the pressure P1 maintained by the pressure regulator;

[0040] 3) Close the stop valve 1 and stop pressurizing the chamber. The pressure gauge indicates the value when the valve inside the pressure regulator closes, which is the closing pressure P2 of the pressure regulator.

[0041] 4) Open the three-way regulating valve and stop valve 2, and adjust the three-way regulating valve so that the rotor flowmeter indicates K2 mL / min. If the pressure indication value rises, it means that the current system leakage rate is less than K2 mL / min; if the pressure indication value drops, it means that the current system leakage rate is greater than K2 mL / min; if the pressure indication value remains unchanged, it means that the current system leakage rate is equal to K2 mL / min.

[0042] It has been verified that the device has the convenient regulation and testing functions of the opening pressure, maintaining pressure, closing pressure, ventilation flow and system leakage rate of the low-gravity simulation training suit pressure regulator. The low-gravity simulation training suit pressure regulator tested and accepted by the device can meet the relevant specifications and has passed the assessment test, and can meet the use requirements of the low-gravity simulation training suit.

Claims

1. A device for measuring working pressure and leakage rate of a pressure regulator, characterized in that: The device comprises: an air source, a pressure reducing valve, a three-way regulating valve, a flow control unit, a three-way joint and a chamber connected in sequence; A pressure gauge is installed in the chamber; The flow control unit includes a first control unit and a second control unit connected in parallel; the flow control ranges of the first control unit and the second control unit are of different orders of magnitude; The pressure regulator to be tested is installed on the interface of the chamber.

2. The device according to claim 1, characterized in that: The first control unit includes: a stop valve 1 and a mass flow meter. The working range of the mass flow meter is 0L / min to 30L / min, and the adjustment accuracy is 0.45L / min.

3. The device according to claim 2, characterized in that: The second control unit includes: a stop valve 2 and a rotor flowmeter. The working range of the rotor flowmeter is 0 mL / min to 30 mL / min, and the adjustment accuracy is 3 mL / min.

4. The device according to claim 3, characterized in that: The volume of the cavity is L±10%L; L is the volume of the low-gravity simulation training suit with the pressure regulator installed.

5. A method for measuring the working pressure and leakage rate of a pressure regulator, the method being implemented based on the device according to any one of the preceding claims, characterized in that: The method process is as follows: Install the pressure regulator on the chamber and adjust the pressure reducing valve so that the outlet pressure of the pressure reducing valve does not exceed the pressure resistance of the subsequent pipeline; Control the three-way regulating valve and stop valve 1 to open, and stop valve 2 to close; measure the working pressure of the pressure regulator; Open the three-way regulating valve and stop valve 2, and close the stop valve 1; measure the leakage rate of the pressure regulator.

6. The method according to claim 5, characterized in that: The working pressure of the pressure regulator includes: opening pressure, maintaining pressure and closing pressure.

7. The method according to claim 6, characterized in that: The process of measuring the working pressure of the pressure regulator is as follows: adjust the three-way regulating valve so that the mass flow meter shows K1 L / min; keep pressurizing the chamber until the valve of the pressure regulator opens, and record the pressure value at this time as the opening pressure P of the pressure regulator; Continue to pressurize the gas supply in the chamber until the pressure indication value remains unchanged, and record the pressure at this time as the pressure regulator maintenance pressure P1; Close the stop valve 1, stop pressurizing the chamber, and wait for the pressure regulator valve to close. The pressure at the moment of closing is the closing pressure of the pressure regulator P 2。 8. The method according to claim 7, characterized in that: The process of measuring the leakage rate of the pressure regulator is as follows: close stop valve 1, open stop valve 2, and adjust the three-way flow valve so that the rotor flowmeter reading is K2mL / min; Read the pressure indication value once every minute. If the indication value rises, the leakage rate of the pressure regulator is less than K2 mL / min. If the indication value drops, the leakage rate of the pressure regulator is greater than K2 mL / min. If the indication value remains unchanged, the leakage rate of the pressure regulator is equal to K2 mL / min.

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