CN212844202U

CN212844202U - CO2 gas leakage detection-based inflation gas circuit system

Info

Publication number: CN212844202U
Application number: CN202022174438.5U
Authority: CN
Inventors: 黄军垒
Original assignee: Zhengzhou Spaceme Co ltd
Current assignee: Zhengzhou Spaceme Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-03-30
Anticipated expiration: 2030-09-29

Abstract

The utility model discloses an inflation gas circuit system based on CO2 gas leakage detection, including inflation system, evacuation system and detecting system, the work piece has been placed to the seal box internal fixation, and inflation system is used for filling CO2 gas into the work piece inner chamber, and the evacuation system is used for carrying out the evacuation operation to the seal box; the detecting system is used for detecting the concentration change of CO2 in the seal box under the vacuum state, detecting system includes detecting tube, vacuum generator and spectrum detecting element, and detecting tube and seal box inner chamber intercommunication, detecting tube are connected with vacuum generator through spectrum detecting element, the utility model discloses use CO2 as the detecting system who detects gas, reduced the cost of equipment, application scope is wide, and atmospheric pressure does not have the influence basically to this invention equipment, is the big innovation of detecting work piece leakproofness technical field with gas, and is safe in utilization.

Description

CO2 gas leakage detection-based inflation gas circuit system

Technical Field

The utility model belongs to the technical field of the work piece leakproofness detects, concretely relates to aerify gas circuit system based on CO2 gas leakage detection.

Background

Helium or a mixed gas of nitrogen and hydrogen is used as a detection gas, a mass spectrometry method is generally adopted, a mass spectrometer and the like used in the method have high equipment cost, are troublesome to operate and have high detection medium cost, CO2 is used as a detection medium, is non-toxic and non-combustible, has obvious advantages compared with the existing helium or helium and hydrogen mixed gas, is usually used for measuring the infrared light of carbon dioxide, has the wavelength of 4.26 mu m, has the advantages of strong absorption of carbon dioxide but no absorption of other common gases or water vapor, but has the detection range of 0-5000ppm of the existing carbon dioxide sensor, the concentration of carbon dioxide in standard air is generally 700ppm, is difficult to control along with the test, and has low sensitivity when the leakage amount of the carbon dioxide filled in the inner cavity of a workpiece is small, meanwhile, because carbon dioxide molecules are heavy, when a workpiece leaks, leaked CO2 sinks to the bottom at first and then slowly rises, and a CO2 detection tube is generally arranged at the upper part of a sealed box, so that a CO2 sensor needs to wait for a long time to detect the change of the concentration of CO2, the time of 5-10 minutes is generally consumed, the detection time is long, and the detection sensitivity is poor.

Meanwhile, during detection, the equipment is generally suitable for standard atmospheric pressure of +/-10%, detection results are distorted or invalid in high-atmospheric-pressure and low-atmospheric-pressure areas, and the application range is greatly influenced by the atmospheric pressure; therefore, as the demand for the sealing property detection of the workpiece increases, it is necessary to develop a system for detecting the sealing property of the workpiece by using CO2 in order to reduce the cost and improve the detection accuracy of the workpiece detection.

Disclosure of Invention

Defect and problem to existing equipment existence, the utility model provides an aerify gas circuit system based on CO2 gas leakage detection, the effectual detection that exists among the existing equipment of having solved is with high costs, troublesome poeration, poor and the low problem of safety coefficient of precision.

The utility model provides a scheme that its technical problem adopted is: an inflation gas path system based on CO2 gas leakage detection comprises an inflation system, a vacuumizing system and a detection system, wherein a workpiece is fixedly placed in a seal box, the inflation system is used for inflating CO2 gas into an inner cavity of the workpiece, and the vacuumizing system is used for vacuumizing the seal box; the detection system is used for detecting the concentration change of CO2 in the sealed box under a vacuum state and comprises a detection tube, a vacuum generator and a spectrum detection unit, wherein the detection tube is communicated with the inner cavity of the sealed box and is connected with the vacuum generator through the spectrum detection unit, and the spectrum detection unit comprises a vacuum tube, a laser emission end, a signal receiving end and a processor; the two ends of the vacuum tube are respectively provided with an air inlet tube and an air outlet tube, the air inlet tube is communicated with the inner cavity of the seal box, the air outlet tube is connected with the vacuum generator, two side faces of the vacuum tube are provided with laser reflecting surfaces, the laser is reflected for multiple times by the laser reflecting surfaces and then emitted from a signal receiving end, the signal receiving end is connected with a processor, and the processor is connected with a display and a storage.

Furthermore, the vacuum tube is a round tube or a square tube vacuum quartz glass tube, the laser emitting end and the signal receiving end are respectively arranged at the left side and the right side of the vacuum tube, and the air inlet tube and the air outlet tube are respectively arranged at the left upper part and the right lower part of the vacuum tube.

Furthermore, the vacuum-pumping system comprises a vacuum-pumping pipe, a vacuum-pumping valve, a sensor and a vacuum pump, wherein the vacuum-pumping pipe is communicated with the inner cavity of the seal box and is sequentially provided with the vacuum-pumping valve, the sensor and the vacuum pump.

Furthermore, the vacuum tubes are arranged in parallel, a connecting block is arranged between every two adjacent vacuum tubes, the adjacent vacuum tubes are communicated to form a circuitous vacuum tube group, a laser emitting end and a signal receiving end are arranged at two ends of each vacuum tube, and the air inlet pipe and the air outlet pipe are respectively arranged on the upper side and the lower side of each vacuum tube.

Furthermore, the inflation system comprises a CO2 gas source, a switch valve, a high-pressure tank, a pressure regulating valve and an inflation valve SV1, wherein the CO2 gas source is connected with the injection pipe through the switch valve, the high-pressure tank, the pressure regulating valve and the inflation valve SV1 in sequence.

The utility model has the advantages that: the utility model discloses compare current detection mode, use CO2 for gaseous detection, and provide a CO2 aerifys detecting system, utilize evacuation system to carry out the evacuation operation in the seal box, make work piece and seal box in be vacuum environment, when the work piece inner chamber takes place to leak, its inside high concentration CO2 that fills can leak to the seal box under the vacuum state in, detect the CO2 concentration in the seal box through detecting system, and change as the standard of judging the work piece leakproofness according to CO2 concentration in the seal box.

The structure for detecting the concentration of CO2 is a spectrum detection unit, and comprises a vacuum tube, a laser emission end, a signal receiving end and a processor; when CO2 in the workpiece leaks, the vacuum generator can continuously extract CO2 in the sealed box, CO2 passes through the vacuum tube and absorbs a specific waveband in laser, an optical signal is converted into an electric signal, and finally the change of the concentration of CO2 is fed back in the form of an image.

Therefore the utility model discloses novel structure provides and uses CO2 as the detecting system who detects gas, has reduced the cost of equipment, and application scope is wide, and atmospheric pressure does not have the influence basically to the equipment of the invention, is the big innovation of detecting work piece leakproofness technical field with gas, and safe in utilization is little to environmental pollution, and is with low costs, and convenient to popularize and utilize has huge economy and social.

Drawings

Fig. 1 is a schematic structural diagram of a spectrum detection unit.

Fig. 2 is another schematic structural diagram of fig. 1.

Fig. 3 is a connection structure frame diagram of the present invention.

The reference numbers in the figures are: the device comprises a vacuum tube 1, an air inlet 2, an air outlet 3, a laser emitting end 4, a signal receiving end 5, a connecting block 6 and a laser reflecting surface 7.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1: the embodiment aims at providing an aerify gas circuit system based on CO2 gas leakage detection, and mainly used uses CO2 to detect the leakproofness of work piece for detecting gas, has with high costs, factor of safety is low, the loaded down with trivial details problem of operating procedure to current detection mode, and the embodiment provides an aerify gas circuit system based on CO2 gas leakage detection.

As shown in figure 1, the system comprises an inflation system, a vacuum pumping system, a sealing box and a detection system, a workpiece is placed in the sealing box in a fixed mode, the sealing box comprises a box body and a sealing cover, the box body is fixed on a rack, the sealing box can effectively isolate the influence of external factors on detection results, and is also an indispensable container for detecting the concentration of the workpiece and CO2, the basic shape of the container is a square body, the upper portion of the sealing box is opened, the sealing cover is located right above the box body and can be driven by a gas-liquid pressurizing cylinder to be driven up and down, the upper opening of the box body is closed or opened, in order to improve the sealing strength of the box body and the sealing cover, a sealing plate and a sealing groove are correspondingly arranged on the sealing cover and the box body, an O-shaped sealing strip is arranged around the sealing plate, the sealing.

When the workpiece is detected, firstly, an outlet of an inner cavity of the workpiece is closed, a unique detection port is reserved, an inflation system and the detection port are in sealing sleeve corresponding to each other, then, a vacuumizing system is used for vacuumizing the sealing box, then, the inflation system is started, high-concentration CO2 detection gas is filled into the inner cavity of the workpiece, and the detection system is used for detecting the concentration change of CO2 in the sealing box in a vacuum state.

In the embodiment, the detection gas is CO2, the detection system comprises a detection tube, a vacuum generator and a spectrum detection unit, the detection tube is communicated with the inner cavity of the seal box and is connected with the vacuum generator through the spectrum detection unit, and the spectrum detection unit comprises a vacuum tube 1, a laser emission end 4, a signal receiving end 5 and a processor; the two ends of the vacuum tube 1 are respectively provided with an air inlet tube 2 and an air outlet tube 3, the air inlet tube 2 is communicated with the inner cavity of the seal box, the air outlet tube 3 is connected with a vacuum generator, two side faces of the vacuum tube 1 are provided with laser reflecting surfaces 7, laser is emitted from a signal receiving end after being reflected for multiple times by the laser reflecting surfaces 7, the signal receiving end is connected with a processor, and the processor is connected with a display and a storage.

The vacuum pumping system comprises a vacuum pumping pipe, a vacuum pumping valve, a sensor and a vacuum pump, wherein the vacuum pumping pipe is communicated with an inner cavity of the seal box and is sequentially provided with the vacuum pumping valve, the sensor and the vacuum pump.

As shown in fig. 1, the vacuum tube 1 is a circular tube or a square tube vacuum quartz glass tube, the laser emitting end 4 and the signal receiving end 5 are respectively arranged at the left and right sides of the vacuum tube 1, and the air inlet tube 2 and the air outlet tube 3 are respectively arranged at the left upper part and the right lower part of the vacuum tube.

Meanwhile, the inner cavity and the external environment of the workpiece are both in vacuum environments, when the tightness of the workpiece is poor, high-concentration CO2 in the inner cavity of the workpiece can be leaked into the vacuum environment of the sealing box, the pressure in the sealing box is increased, the pressure at the vacuum generator is low, the leaked CO2 can be continuously extracted by the vacuum generator, the CO2 leaked in the sealing box is injected into the vacuum tube in the extraction process and is sent out from the signal receiving end after multiple reflections, the laser stroke can be improved through the multiple reflections, the laser can be contacted with CO2 in the vacuum tube in the reflection process, and the CO2 can absorb specific wavelengths, so that different optical signals of the signal receiving end are received, the processor converts the optical signals into corresponding electrical signals and transmits the electrical signals to the display and the storage in the form of images; the CO2 leakage quantity of the workpiece inner cavity can be obtained according to the characteristic value of the image.

Example 2: this example is substantially the same as example 1, except that: the present embodiment further defines the structure of the inflation system.

As shown in fig. 3, the inflation system comprises a CO2 gas source, a switch valve, a high-pressure tank, a pressure regulating valve and an inflation valve SV1, wherein the CO2 gas source is connected with the injection pipe through the switch valve, the high-pressure tank, the pressure regulating valve and the inflation valve SV1 in sequence;

therefore, the invention utilizes CO2 as detection gas, has high detection precision and convenient use, can greatly reduce the requirements of gas detection on detection media, simultaneously reduces the cost of detection equipment, has safe use and huge economic and social benefits, and is a great innovation for detecting the gas tightness of workpieces.

Example 3: this example is substantially the same as example 1, except that: this embodiment provides an alternative construction of the vacuum tube.

The vacuum tube 1 is provided with a plurality of vacuum tubes in parallel, a connecting block 6 is arranged between the adjacent vacuum tubes, the adjacent vacuum tubes 1 are communicated to form a circuitous vacuum tube group, the two ends of each vacuum tube are provided with a laser emitting end 4 and a signal receiving end 5, and the air inlet pipe 2 and the air outlet pipe 3 are respectively arranged on the upper side and the lower side of the vacuum tube.

In the embodiment, the concentration of CO2 can be measured in each vacuum tube, multiple groups of vacuum tubes are correspondingly arranged, each group generates a detection image, characteristic values are extracted, the multiple groups of characteristic values are averaged, and a final detection result is obtained.

Claims

1. The utility model provides an aerify gas circuit system based on CO2 leakage detection which characterized in that: the device comprises an inflation system, a vacuum pumping system and a detection system, wherein a workpiece is fixedly placed in a sealed box, the inflation system is used for inflating CO2 gas into an inner cavity of the workpiece, and the vacuum pumping system is used for performing vacuum pumping operation in the sealed box; the detection system is used for detecting the concentration change of CO2 in the sealed box under a vacuum state and comprises a detection tube, a vacuum generator and a spectrum detection unit, wherein the detection tube is communicated with the inner cavity of the sealed box and is connected with the vacuum generator through the spectrum detection unit, and the spectrum detection unit comprises a vacuum tube, a laser emission end, a signal receiving end and a processor; the two ends of the vacuum tube are respectively provided with an air inlet tube and an air outlet tube, the air inlet tube is communicated with the inner cavity of the seal box, the air outlet tube is connected with the vacuum generator, two side faces of the vacuum tube are provided with laser reflecting surfaces, the laser is reflected for multiple times by the laser reflecting surfaces and then emitted from a signal receiving end, the signal receiving end is connected with a processor, and the processor is connected with a display and a storage.

2. The CO2 gas leak detection-based inflation gas circuit system according to claim 1, wherein: the vacuum tube is a round tube or a square tube vacuum quartz glass tube, the laser emitting end and the signal receiving end are respectively arranged at the left side and the right side of the vacuum tube, and the air inlet tube and the air outlet tube are respectively arranged at the left upper part and the right lower part of the vacuum tube.

3. The CO2 gas leak detection-based inflation gas circuit system according to claim 1, wherein: the vacuum-pumping system comprises a vacuum-pumping pipe, a vacuum-pumping valve, a sensor and a vacuum pump, wherein the vacuum-pumping pipe is communicated with the inner cavity of the seal box and is sequentially provided with the vacuum-pumping valve, the sensor and the vacuum pump.

4. The CO2 gas leak detection-based inflation gas circuit system according to claim 1, wherein: the vacuum tube sets up side by side has a plurality ofly, is provided with the connecting block between the adjacent vacuum tube, and adjacent vacuum tube intercommunication has formed circuitous form vacuum tube group, and the both ends of every vacuum tube all are provided with laser emission end and signal receiving terminal, and intake pipe and outlet duct set up the upper and lower both sides at the vacuum tube respectively.

5. The CO2 gas leak detection-based inflation gas circuit system according to claim 1, wherein: the inflation system comprises a CO2 gas source, a switch valve, a high-pressure tank, a pressure regulating valve and an inflation valve SV1, wherein the CO2 gas source is connected with the injection pipe sequentially through the switch valve, the high-pressure tank, the pressure regulating valve and the inflation valve SV 1.