CN110146233A - Gas leak detection device - Google Patents

Abstract

The invention discloses a gas leakage detection device, which is used to detect the leakage status of a pneumatic pressure measurement device, comprising: a gas storage bottle communicated with the gas outlets of each pressure scanning valve of the pneumatic pressure measurement device, the gas storage bottle stores high pressure Gas is detected, and it is equipped with a valve for conducting and shutting off the gas storage cylinder; a gas collection box sleeved at the connection between the pressure introduction tube of the pneumatic pressure measurement device and the air pressure collection piece; it communicates with the inner cavity of the gas collection box and can A gas leak detector that detects and displays the leak rate of the detected gas; a control system that communicates with the pressure scanning valve, and the control system can control the opening and closing of each measurement port. In this way, the gas leakage detection device provided by the present invention can not only accurately detect the leakage state of the connection between each pressure induction pipe and the air pressure collection part, but also measure and display the leakage rate, so as to intuitively know the pressure of the pressure induction pipe. Whether the connection is qualified.

Description

Gas leak detection device

technical field

The invention relates to the technical field of gas detection of aviation supporting products, and more specifically relates to a gas leakage detection device suitable for a pneumatic pressure measurement device.

Background technique

After the aero-engine is assembled with the whole machine, it must be tested to monitor its motion state and check whether its performance meets the standard before it can be officially put into use. Among them, the measurement of aerodynamic pressure is an important test content, which is the measurement of the airflow pressure inside the aero-engine. In the prior art, as shown in FIG. 1 , the pneumatic pressure measurement device used for pneumatic pressure measurement includes a plurality of air pressure acquisition parts 1 extending into various positions inside the aeroengine, and each air pressure acquisition part 1 Correspondingly connected and communicated pressure introduction pipes 2 , pressure scanning valves 3 connected and communicated with each pressure introduction pipe 2 through the measurement port 5 one by one, and a computer 4 for collecting data information of the pressure scanning valves 3 . Each air pressure collection part 1 is provided with an air chamber for air flow to enter and pass through, and the air chamber communicates with the first end of the pressure introduction pipe 2 through the outlet pipe 6; each pressure scanning valve 3 is provided with several measurement ports 5, which can Measure any pressure range, and built-in the latest microprocessor; the second end of each pressure introduction tube 2 is connected and communicated with a measurement port 5, and each measurement port 5 can measure pressure information and store calibration data, pressure range, Information such as factory calibration data and each calibration date set by the user; the computer 4 can automatically collect and analyze the data information of the pressure scanning valve 3 for the experimenter to view.

After the aero-engine is started, the airflow generated at different positions enters each pressure introduction pipe 2 through the air cavity of each air pressure collection part 1, and then enters the pressure scanning valve 3 through the measurement port 5 connected one-to-one with the cause pipe 2, which is connected to each measurement port. connected lumen. The EEPROM of the pressure scanning valve 3 records the pressure information of each measurement port 5, and then the computer 4 performs data calculations such as pressure value calibration and pressure change analysis, so that the test personnel can know the various positions inside the aeroengine corresponding to each pressure collection part 1 place pressure.

However, the pressure induction pipe 2 is a nylon pipe, and the outlet pipe 6 connecting the air pressure collection part 1 and the pressure induction pipe 2 is a stainless steel pipe. Steel rings are used to seal the interface. Due to material differences, human errors, etc., serious airflow leakage problems often occur at the joint 7, and it is difficult to find the interface before the vehicle test of the aero-engine by artificially detecting the connectivity of the interface. Whether there is air leakage, and after the test starts, since the number of air pressure collection parts 1 and cause pipes 2 is as many as hundreds or thousands, the air pressure measuring points are all scattered single measuring points, there is no reference comparison, if a certain cause pipe 2 There is an airflow leak, which is also difficult to judge, and multiple leaks caused by tube 2 will cause greater interference to the measurement results of the aerodynamic pressure, seriously affecting the reliability and measurement accuracy of the test results of the aeroengine.

Therefore, how to carry out accurate leak detection on the pneumatic pressure measuring device before the vehicle test of the aero-engine, to check whether the connection of each pressure induction pipe is qualified, and to ensure the reliability and accuracy of the measurement results of the pneumatic pressure measuring device has become an art in the art. Problems that technicians urgently need to solve.

Contents of the invention

The purpose of the present invention is to provide a gas leakage detection device, which can be applied to a pneumatic pressure measurement device, not only can accurately detect the leakage state of the connection between each pressure introduction tube and the air pressure collection part, but also can measure the leakage rate And display, so that the operator can intuitively know whether the connection of each pressure induction pipe is qualified.

A gas leakage detection device provided by the present invention is used to detect the leakage status of a pneumatic pressure measurement device, the pneumatic pressure measurement device includes a plurality of air pressure collection parts, and the first end is in one-to-one correspondence with the plurality of air pressure collection parts A plurality of pressure introduction tubes connected with the outlet tubes of the pressure introduction tubes, a plurality of pressure scanning valves, the pressure scanning valves include measurement ports connected to the second ends of the pressure introduction tubes in one-to-one correspondence and can be connected to a plurality of the measurement ports Connected and blocked outlets, including:

A gas storage bottle communicated with the gas outlet of each of the pressure scanning valves, the gas storage bottle stores high-pressure detection gas, and is provided with a valve for conducting and blocking the connection between the gas storage bottle and the gas outlet ; the gas collection box sleeved at the junction of the pressure induction tube and the air pressure collection part, the gas collection box is provided with a socket for accommodating the junction of the pressure introduction pipe and the outlet pipe of the air pressure collection part The inner cavity and the openings communicating with the inner cavity respectively for the extension of the pressure introduction tube and the outlet tube; communicated with the inner cavity of the gas collection box and capable of detecting the detection gas in the gas storage bottle A gas leak detector, the gas leak detector can detect and display the leakage rate of the detected gas; a control system connected in communication with the pressure scanning valve, the control system can control the opening and closing of each of the measurement ports .

Preferably, the control system is connected in communication with the gas leak detector, the control system is set with a preset value, and the control system compares each received leakage rate with the preset value and outputs compare results.

Preferably, the opening of the gas collecting box is provided with a sealing gasket integrally connected with the gas collecting box.

Preferably, the gas collecting box is provided with a box body with a cavity and a box cover sealing the opening of the cavity, and the box cover is openably and closably connected to the box body.

Preferably, the valve of the gas storage bottle is set as a pressure regulating valve.

Preferably, a valve controller electrically connected to the pressure regulating valve and used to control the opening and closing of the pressure regulating valve is also included.

Preferably, a pressure sensor is provided at the outlet end of the pressure regulating valve, and both the valve controller and the pressure sensor are electrically connected to the control system.

Preferably, the gas leak detector is provided with a vacuum pump and a chamber containing the vacuum pump, the detection element of the gas leak detector is arranged in the chamber, the chamber is provided with two inlet ports and the The air collection box communicates with the chamber through one of the air inlet ports.

Preferably, the detection gas is set to helium, and the gas leak detector is set to a helium mass spectrometer leak detector; or, the detection gas is set to a mixture of helium and nitrogen, and the gas leak detector is set to It is a helium mass spectrometer leak detector.

Preferably, the detection gas is set as a mixture of hydrogen and nitrogen, and the gas leak detector is set as a hydrogen-helium mass spectrometer leak detector.

In the technical solution provided by the present invention, the gas leakage detection device is used to detect the leakage state of the pneumatic pressure measurement device and is connected with the pneumatic pressure measurement device, including a gas storage device connected to the air chamber of the pressure scanning valve of the pneumatic pressure measurement device The bottle, the gas collection box set at the junction of the induction tube of the pneumatic pressure measurement device and the air pressure collection part, the gas leakage detector connected with the inner cavity of the gas collection box, and the control system connected with the pressure scanning valve.

Among them, there is high-pressure detection gas stored in the gas storage cylinder. After the valve of the gas storage cylinder is opened, the detection gas can enter the inner chamber of the pressure scanning valve that is connected to each measurement port, and then enter the pressure induction pipe through the measurement port and flow through the The connection between the pressure introduction tube and the air pressure collection part; the gas collection box is provided with a closed inner cavity, if the connection between the pressure introduction pipe and the air pressure collection part leaks, the detection gas will enter the inner cavity of the gas collection box and be mixed with the gas collection The leak rate is detected by the gas leak detector connected to the inner cavity of the box; the control system can control the opening and closing of each measurement port of the pressure scanning valve, and the control system can realize the opening and closing of each measurement port in turn. One corresponding connection, each pressure induction tube can be conducted in turn, and the detection gas can enter each pressure induction tube in turn, so that the gas leakage detector can detect whether there is leakage at the connection between each pressure induction tube and the air pressure collection part, and can pass the display The screen displays the gas leakage rate of each connection, so that the operator can intuitively get the result of whether the leakage rate is within the preset range and whether the connection of each pressure induction pipe is qualified.

In this way, the gas leakage detection device provided by the present invention is suitable for a pneumatic pressure measurement device, which can not only accurately detect the leakage state of the connection between each pressure induction tube and the air pressure collection part, but also monitor the leakage rate of the pressure induction tube. Measurement and display, so that the operator can intuitively know whether the connection of each pressure induction pipe is qualified.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the pneumatic pressure measuring device in the prior art;

Fig. 2 is a schematic structural diagram of a gas leakage detection device in an embodiment of the present invention.

In Figure 1-2:

Air pressure acquisition part-1, pressure pipe-2, pressure scanning valve-3, gas cylinder-301, valve-302, valve controller-303, control system-401, measurement port-5, outlet pipe-6, connection Place-7, gas collection box-701, gas leak detector-702, gas outlet-8.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

The purpose of this specific embodiment is to provide a gas leakage detection device, which is suitable for a pneumatic pressure measurement device, and can not only accurately detect the leakage state of the connection between each pressure introduction tube and the air pressure collection part, but also measure the leakage rate And display, so that the operator can intuitively know whether the connection of each pressure induction pipe is qualified.

Hereinafter, the embodiments will be described in detail in conjunction with the accompanying drawings. In addition, the examples shown below do not limit the content of the invention described in the claims in any way. In addition, all the contents of the configurations shown in the following embodiments are not limited to be essential to the solution of the invention described in the claims.

Please refer to accompanying drawings 1-2, a gas leakage detection device provided in this embodiment is suitable for the pneumatic pressure measurement device shown in Figure 1, and can measure whether the connection status of each pressure introduction pipe 2 of the pneumatic pressure measurement device is qualified . As shown in FIG. 1 or FIG. 2 , the pneumatic pressure measurement device is provided with a plurality of air pressure collection pieces 1 , pressure introduction tubes 2 corresponding to the air pressure collection pieces 1 , and pressure scanning valves 3 connected to each pressure introduction pipe 2 . The pressure scanning valve 3 is provided with several measuring ports 5 correspondingly connected with the pressure guiding pipe 2 one by one, and each measuring port 5 of the pressure scanning valve 3 communicates with the air cavity of the pressure scanning valve 3 . The air cavity is provided with an air outlet 8 . In practical applications, if the number of pressure guiding pipes 2 is hundreds or thousands, multiple pressure scanning valves 3 are required, and each pressure scanning valve 3 can be connected to the gas outlets 8 of every two adjacent pressure scanning valves 3 with an air guide tube. Or a respective measurement port 5 to realize mutual communication. As shown in FIG. 1 , the gas outlet 8 can also be a measurement port 5 of the pressure scanning valve 3 .

As shown in Figure 2, the gas leakage detection device provided in this embodiment includes a gas storage bottle 301 connected to the gas outlet 8 of the pressure scanning valve 3 of the pneumatic pressure measurement device, has a closed inner cavity and is sleeved on the pressure introduction tube 2 The gas collection box 701 at the connection point 7 of the air pressure collection part 1, the gas leakage detector 702 communicated with the inner cavity of the gas collection box 701, and the control system 401 communicated with the pressure scanning valve 3.

Wherein, the gas storage bottle 301 stores high-pressure detection gas, and the gas storage bottle 301 is provided with a valve 302 that can conduct or block the flow state of the detection gas. After the valve 302 of the gas storage cylinder 301 is opened, the detection gas can enter the air cavity connected to each measurement port 5 through the gas outlet 8 of the pressure scanning valve 3, and then enter the pressure introduction tube 2 through the measurement port 5, and flow through the induction tube 2. The joint 7 between the pressure tube 2 and the air pressure collection part 1 . The gas collection box 701 is provided with a closed inner cavity for accommodating the joint 7 of the pressure induction tube 2 and the air pressure collection part 1; the gas leakage detector 702 has a detection element capable of sensing the detected gas, a vacuum pump, and a chamber for accommodating the vacuum pump. The components are located in the chamber, which communicates with the inner chamber of the gas collection box 701, and the inner chamber of the gas collection box 701 can be extracted into a vacuum area or a negative pressure area by a vacuum pump. If there is a leak at the connection 7 between the pressure induction tube 2 and the air pressure collection part 1, the detection gas will enter the inner cavity of the gas collection box 701 from the leak point, and then enter the chamber, where it can be sensed by the detection element of the gas leakage detector 702 .

While the control system 401 can control the opening and closing of each measurement port 5 of the pressure scanning valve 3, the control system 401 can realize the opening and closing of each measurement port 5 or the opening and closing of each measurement port 5 of each pressure scanning valve 3 in sequence, each time The opening and closing time can be adjusted and controlled. When opening and closing each measurement port 5 in sequence, since the pressure induction tube 2 is connected with the measurement port 5 in a one-to-one correspondence, each pressure induction tube 2 can be conducted in turn, and the detection gas can enter each pressure induction tube 2 in sequence, and the opening and closing time can be set That is, the conduction time of each pressure induction tube 2, the gas to be detected flows stably through the connection 7 between the pressure induction tube 2 and the air pressure collection part 1, and the gas leakage detector 702 can detect the connection between each pressure induction tube 2 and the air pressure collection part 1. Check whether the connection 7 of part 1 is leaking, and display the gas leakage rate of each connection 7; open and close all the measurement ports 5 of each pressure scanning valve 3 in turn, and use the pressure scanning valve 3 as a unit to perform group detection. If there is no problem with this group of tests, you can directly proceed to the next group of tests. If there is a gas leak in this group of tests, then perform a sequential conduction test on all the measurement ports 5 of the group to see which pressure induction tube 2 exists. Leak condition. Thereby the operator can check whether there is leakage in each pressure induction pipe 2 through the display screen of the gas leakage detector 702 and know the leakage rate of the pressure induction pipe 2 with leakage. By comparing each leakage rate with the standard leakage rate value, It can be quickly and intuitively known whether the connection of the pressure induction pipe 2 is qualified.

In this way, the gas leakage detection device provided in this embodiment is suitable for a pneumatic pressure measurement device. By utilizing the structural characteristics of the pressure scanning valve 3 of the pneumatic pressure measurement device, not only can the connection between each pressure introduction pipe 2 and the air pressure collection part 1 7 Carry out accurate detection of the leakage state, and can also measure and display the leakage rate of the pressure induction pipe 2, so that you can intuitively know whether the connection of each pressure induction pipe 2 is qualified; and the entire detection process realizes automatic control and automatic judgment Whether the connection of the pressure induction pipe 2 is qualified, so as to avoid the influence of human misoperation on the test results.

Further, the control system 401 can also communicate with the gas leakage detector 702, the control system 401 can collect the data information recorded by the gas leakage detector 702 in real time, compare each data with the preset leakage rate, and output each The comparison result of whether the leakage rate is within the preset range enables the operator to automatically know whether the connection of each pressure induction pipe 2 is qualified, and the measured leakage rate and comparison results can directly provide data basis for the measurement results of the pneumatic pressure measurement device , for the tester to know the leak rate value and how much it affects the pressure measurement in the pneumatic pressure measurement test.

The control system 401 has an instruction receiving module, an execution module that controls the opening and closing of each measurement port 5, and a data processing module that receives data information from the gas leak detector 702 in real time and compares the information with a preset value, and outputs the comparison result. The control system 401 can adopt programmable data acquisition software or programmable PLC. Each measurement port 5 of the pressure scanning valve 3 is a pneumatic valve, including a solenoid valve and a pneumatic valve actuator. The pneumatic valve actuator can be opened by detecting the pressure of the gas itself, and the control system 401 can control the opening and closing of each measurement port 5 by controlling the solenoid valve and the valve 302 of the gas storage cylinder 301 on and off.

Specifically, the gas collecting box 701 is provided with a box body with a cavity and a box cover capable of closing the opening of the cavity, and the box cover is openably and closably connected with the box body. The closure of the box cover and the box body can form the closed inner cavity of the gas collection box 701. When the box cover is opened, the joint 7 of the pressure introduction tube 2 and the outlet tube 6 of the air pressure collection part 1 can be put into the inner cavity, and the pressure can be induced. The tube 2 and the lead-out tube 6 respectively protrude through the opening on the gas collecting box 701, and the opening is provided with a seal to seal the opening and avoid damage to the closed inner chamber. The sealing member may be a gasket integrally connected with the gas collecting box 701, which not only ensures the sealing effect, but also prevents the gasket from falling off.

The pressure of the detection gas in the gas storage cylinder 301 can be realized by compressing the gas in the gas storage cylinder 301 when storing the detection gas in the gas storage cylinder 301; the valve 302 of the gas storage cylinder 301 can be arranged on the body of the gas storage cylinder 301 Or it is arranged on the pipeline connecting the gas cylinder 301 and the pressure scanning valve 3 . The gas cylinder 301 can be set as one connected to all the pressure scanning valves 3 , or can be arranged as a plurality of connected to several pressure scanning valves 3 , depending on the actual situation.

The valve 302 of the gas cylinder 301 can also be set as a pressure regulating valve, so as to ensure that the detection gas passing into the pressure scanning valve 3 has a preset positive pressure value. The valve opening and closing of the pressure regulating valve can be manually adjusted and set by the operator, or can be remotely controlled by connecting the valve controller 303 to provide convenience for the operator. Further, a pressure sensor can also be provided at the outlet end of the pressure regulating valve, and the pressure sensor and the valve controller 303 are both electrically connected to the control system 401, so that the control system 401 can adjust the pressure of the pressure regulating valve in real time according to the pressure value detected by the pressure sensor. The output pressure at the outlet port works in cooperation with the valve controller 303. When detection is required, the valve controller 303 opens the outlet valve of the pressure regulating valve, and closes the valve of the pressure regulating valve when detection is not required.

In the prior art, the chamber containing the vacuum pump of the gas leakage detector 702 is provided with an air inlet port, the air inlet port is connected with a suction gun, the suction gun can be held by the operator, and the opening of the suction gun can be used for gas leakage. The detection port of the detector 702. Then the inner cavity of the gas collecting box 701 can be communicated with the chamber through the opening of the suction gun; A connecting sniffer, so set up, the gas leak detector 702 has the detection port of the sniffer in addition to the detection port of the gas collection box 701, which can be used for other connections of the pneumatic pressure measurement device, such as the pressure induction tube 2 and the measurement port. 5 for leak detection.

Specifically, the detection gas can be helium, or a mixture of helium and nitrogen, or a mixture of hydrogen and nitrogen. Correspondingly, the gas leak detector 702 can be set as a helium mass spectrometer leak detector or a hydrogen-helium mass spectrometer leak detector. instrument. The chemical properties of nitrogen and helium are inactive. When hydrogen and nitrogen are mixed, the chemical properties of the mixed gas are also inactive. Under normal conditions, they do not combine with other elements or compounds, and hydrogen and helium are easy to detect. Gas, with high safety and practicality.

It can be understood that, the same or similar parts in the above embodiments can be referred to each other, and the content that is not described in detail in some embodiments can be referred to the same or similar content in other embodiments. The multiple solutions provided by the present invention include their own basic solutions, are independent of each other, and do not restrict each other, but they can also be combined without conflict to achieve multiple effects.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A gas leakage detection device, used to detect the leakage condition of a pneumatic pressure measurement device, said pneumatic pressure measurement device comprises a plurality of air pressure collection parts (1), and the first end is in one-to-one correspondence with a plurality of said air pressure collection parts A plurality of pressure introduction pipes (2) connected to the outlet pipe (6) of the piece (1) and a plurality of pressure scanning valves (3), and the pressure scanning valve (3) includes a connection with the pressure introduction pipe (2) The measuring port (5) that the second end is connected in one-to-one correspondence and the gas outlet (8) that can be communicated with and cut off with a plurality of said measuring ports (5), is characterized in that, comprises: A gas storage bottle (301) communicated with the gas outlet (8) of each of the pressure scanning valves (3), the gas storage bottle (301) stores a high-pressure detection gas, and is provided with a device for conducting and blocking the The valve (302) connected between the gas cylinder and the gas outlet (8); The gas collection box (701) sleeved at the connection (7) between the pressure induction pipe (2) and the air pressure collection part (1), the gas collection box (701) is provided with a The lumen at the junction of the pipe (2) and the outlet pipe (6) of the air pressure collection part (1) and the inner cavity communicated with the inner chamber for the pressure introduction pipe (2) and the outlet pipe (6) ) protrudes from the opening; A gas leak detector (702) that communicates with the inner cavity of the gas collection box (701) and can detect the gas in the gas storage bottle (301), the gas leak detector (702) can detect and displaying the leakage rate of the detected gas; With the control system (401) of the pressure scanning valve (3), the control system (401) can control the opening and closing of each of the measurement ports (5). 2. The gas leak detection device according to claim 1, the control system (401) is connected to the gas leak detector (702) in communication, the control system (401) is provided with a preset value, and the control system (401) The system (401) compares each received leakage rate with the preset value, and outputs a comparison result. 3. The gas leakage detection device according to claim 1, characterized in that, the opening of the gas collecting box (701) is provided with a sealing gasket integrally connected with the gas collecting box (701). 4. The gas leakage detection device according to claim 1, characterized in that, the gas collecting box (701) is provided with a box body with a cavity and a box cover for sealing the opening of the cavity, and the box cover It is openably and closably connected to the box body. 5. The gas leakage detection device according to claim 1, characterized in that, the valve (302) of the gas storage bottle (301) is set as a pressure regulating valve. 6. The gas leakage detection device according to claim 5, further comprising a valve controller (303) electrically connected to the pressure regulating valve and used to control the opening and closing of the pressure regulating valve. 7. The gas leakage detection device according to claim 6, characterized in that, the outlet end of the pressure regulating valve is provided with a pressure sensor, and the valve controller (303) and the pressure sensor are all connected with the control system (401) electrical connection. 8. The gas leak detection device according to claim 1, characterized in that, the gas leak detector (702) is provided with a vacuum pump and a chamber for accommodating the vacuum pump, and the detection element of the gas leak detector (702) It is arranged in the chamber, the chamber is provided with two air inlet ports, and the gas collection box (701) communicates with the chamber through one of the air inlet ports. 9. The gas leak detection device according to claim 1, wherein the detection gas is set to helium, and the gas leak detector (702) is set to a helium mass spectrometer leak detector; Alternatively, the detection gas is set as a mixture of helium and nitrogen, and the gas leak detector (702) is set as a helium mass spectrometer leak detector. 10. The gas leak detection device according to claim 1, characterized in that, the detection gas is set as a mixture of hydrogen and nitrogen, and the gas leak detector (702) is set as a hydrogen-helium mass spectrometer leak detector.