CN110146232B - Vacuum box hydrogen leakage detection system and operation method thereof - Google Patents
Vacuum box hydrogen leakage detection system and operation method thereof Download PDFInfo
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- CN110146232B CN110146232B CN201910533776.2A CN201910533776A CN110146232B CN 110146232 B CN110146232 B CN 110146232B CN 201910533776 A CN201910533776 A CN 201910533776A CN 110146232 B CN110146232 B CN 110146232B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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Abstract
The invention discloses a hydrogen leakage detection system for a vacuum box, which comprises a mechanical system and an electrical control system, wherein the signal output end of a sensing element in the mechanical system is electrically connected with the signal input end in the electrical control system, and the control signal input end of an execution element in the mechanical system is electrically connected with the control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are communicated with each other; the gas charging system comprises a hydrogen cylinder and a nitrogen cylinder; the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank; the vacuum box system comprises a vacuum box and a vacuumizing pump set; the hydrogen leak detection system includes a hydrogen leak detector. A method of operating a vacuum box hydrogen leak detection system is also included. The vacuum leak detection can be realized without helium, the cost is low, the maintenance is convenient, and the popularization and the application of the system are facilitated.
Description
Technical Field
The invention relates to a vacuum box leak detection system and an operation method thereof, in particular to a vacuum box hydrogen leak detection system and an operation method thereof.
Background
Leakage rate of workpieces is detected by leakage detecting equipment in the prior art, wherein the numerical value measured by the vacuum leakage detecting equipment is accurate and high in precision, and the leakage detecting equipment is widely applied to exchanging a plurality of workpieces such as heat exchangers, condensers, evaporators, compressors, stop valves, refrigeration industry products such as refrigerators, freezers and snow melt machines. At present, a common vacuum leak detection system usually uses helium as filling gas, the helium is used as a scarce inert gas, the helium has limited sources but large consumption, basically has no extraction value, is mainly derived from associated gas recovery in natural gas exploitation, is expensive, and is not beneficial to popularization and application of the vacuum leak detection system.
Disclosure of Invention
The invention aims to solve the first technical problem of providing a vacuum box hydrogen leakage detection system, which can realize vacuum leakage detection without helium, has low cost and convenient maintenance and is beneficial to popularization and application of the system.
In order to solve the first technical problem, the vacuum box hydrogen leakage detection system comprises a mechanical system and an electrical control system, wherein a signal output end of a sensing element in the mechanical system is electrically connected with a signal input end in the electrical control system, and a control signal input end of an execution element in the mechanical system is electrically connected with a control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are communicated with each other; the gas charging system comprises a hydrogen cylinder and a nitrogen cylinder; the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank; the vacuum box system comprises a vacuum box and a vacuumizing pump set; the hydrogen leakage detection system comprises a hydrogen leakage detector; the gas outlet intercommunication of hydrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet intercommunication of nitrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet of hydrogen nitrogen mist jar penetrates in proper order sealedly through the pipeline in vacuum chamber and the work piece of being examined, the air inlet of hydrogen leak detector pass through the pipeline with the sealed intercommunication of vacuum chamber, the evacuation pump package pass through the main line with the sealed intercommunication of vacuum chamber, the evacuation pump package penetrates through other pipeline sealedly in the vacuum chamber and with the sealed intercommunication of work piece of being examined.
And a hydrogen pressure gauge is arranged at the gas outlet of the hydrogen cylinder.
And a hydrogen pressure adjusting unit, a hydrogen flowmeter and a hydrogen electromagnetic valve are sequentially communicated between the hydrogen cylinder and the hydrogen-nitrogen mixed gas tank in series.
And a nitrogen pressure gauge is arranged at the air outlet of the nitrogen bottle.
And a nitrogen pressure adjusting unit, a nitrogen flowmeter and a nitrogen electromagnetic valve are sequentially communicated between the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank in series.
The hydrogen cylinder, the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank are communicated through a three-way component.
And a hydrogen-nitrogen mixed gas pressure regulating unit and a hydrogen-nitrogen mixed gas electromagnetic valve are sequentially connected between the hydrogen-nitrogen mixed gas tank and the vacuum box in series.
And a hydrogen collecting tank, a molecular pump and a leak detection electromagnetic valve are sequentially communicated between the hydrogen leak detector and the vacuum box in series.
And a pipeline outlet for communicating the hydrogen leak detector with the vacuum box is provided with a plurality of angle valves.
The outlets of the angle valves are communicated with the vacuum box.
The outlets of the plurality of angle valves communicate with the top wall of the vacuum box.
The hydrogen collection tank is provided with a hydrogen concentration meter.
The hydrogen collection tank is provided with a stepping motor.
And a main pumping valve is arranged at an air inlet of the vacuum pumping set.
The vacuum box is provided with a vacuum gauge and a hydrogen pressure transmitter.
The vacuum gauge is mounted on the top wall of the vacuum box.
The hydrogen pressure transmitter is installed on the top wall of the vacuum box.
The electrical control system comprises a PLC controller.
The vacuum box is provided with a sealing door.
The sealing door is connected with the vacuum box sealing switch through a door opening mechanism.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure gauge.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen flowmeter.
And the signal input end of the PLC is electrically connected with the signal output end of the nitrogen pressure gauge.
And the signal input end of the PLC is electrically connected with the signal output end of the nitrogen flowmeter.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen-nitrogen mixed gas pressure transmitter.
And the signal input end of the PLC is electrically connected with the signal output end of the vacuum gauge.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure transmitter.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen leak detector.
And the signal input end of the PLC is electrically connected with the signal output end of the hydrogen concentration meter.
And the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen pressure regulating unit.
And the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen electromagnetic valve.
And the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen pressure adjusting unit.
And the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen electromagnetic valve.
And the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas pressure regulating unit.
And the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas electromagnetic valve.
And the PLC controller control signal output end is electrically connected with the control signal input end of the stepping motor.
And the control signal output end of the PLC is electrically connected with the control signal input end of the vacuumizing pump set.
And the control signal output end of the PLC is electrically connected with the control signal input end of the main pumping valve.
And the control signal output end of the PLC is electrically connected with the control signal input end of the leak detection electromagnetic valve.
And the control signal output end of the PLC is electrically connected with the control signal input end of the molecular pump.
And the control signal output end of the PLC is electrically connected with the control signal input end of the angle valve.
And the control signal output end of the PLC is electrically connected with the control signal input end of the door opening mechanism.
The PLC controller is located in the control cabinet.
The hydrogen-nitrogen mixed gas tank comprises a tank body, a spiral mixer, a magnetic fluid, a coupler and a support.
The tank body is in a cylinder shape.
One end of the cylinder is sealed by a hemispherical surface.
The other end of the cylinder is sealed by a plane.
The center of the plane is provided with a shaft hole.
The tank body is connected with the magnetic fluid in a sealing and rotating mode through the shaft hole.
The inner end of the magnetic fluid is coaxially and fixedly connected with the spiral mixer.
The outer end of the magnetic fluid is in transmission connection with the stepping motor through a coupler.
The stepping motor is fixedly connected with the tank body through a support.
Compared with the prior art, the vacuum box hydrogen leakage detection system has the following beneficial effects.
1. According to the technical scheme, the vacuum box hydrogen leakage detection system comprises a mechanical system and an electrical control system, wherein a signal output end of a sensing element in the mechanical system is electrically connected with a signal input end in the electrical control system, and a control signal input end of an execution element in the mechanical system is electrically connected with a control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are mutually communicated (the control system has clear layers and is convenient to operate); the gas charging system comprises a hydrogen cylinder and a nitrogen cylinder; the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank; the vacuum box system comprises a vacuum box and a vacuumizing pump set; the hydrogen leakage detection system comprises a hydrogen leakage detector; the gas outlet intercommunication of hydrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet intercommunication of nitrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet of hydrogen nitrogen mist jar penetrates in proper order sealedly through the pipeline in vacuum chamber with by in the work piece, the air inlet of hydrogen leak detector pass through the pipeline with the sealed intercommunication of vacuum chamber, the evacuation pump package pass through the main line with the sealed intercommunication of vacuum chamber, the evacuation pump package penetrates through other pipeline sealedly in the vacuum chamber and with the technical means who is by the sealed intercommunication of work piece, so, only through mixing hydrogen and nitrogen gas and send into the work piece in, need not use the helium can realize the vacuum leak hunting, low cost, it is convenient to maintain, is favorable to the popularization and application of system.
2. In the technical scheme, the hydrogen pressure gauge is configured at the gas outlet of the hydrogen cylinder; a hydrogen pressure adjusting unit, a hydrogen flowmeter and a hydrogen electromagnetic valve are sequentially communicated between the hydrogen cylinder and the hydrogen-nitrogen mixed gas tank in series; a nitrogen pressure gauge is arranged at the air outlet of the nitrogen bottle; a nitrogen pressure adjusting unit, a nitrogen flowmeter and a nitrogen electromagnetic valve are sequentially communicated between the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank in series; the hydrogen cylinder, the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank are communicated through a three-way component; a hydrogen-nitrogen mixed gas pressure regulating unit and a hydrogen-nitrogen mixed gas electromagnetic valve are sequentially connected between the hydrogen-nitrogen mixed gas tank and the vacuum box in series; a hydrogen collecting tank, a molecular pump and a leak detection electromagnetic valve are sequentially communicated between the hydrogen leak detector and the vacuum box in series; a pipeline outlet for communicating the hydrogen leak detector with the vacuum box is provided with a plurality of angle valves; the outlets of the angle valves are communicated with the vacuum box; the outlets of the angle valves are communicated with the top wall of the vacuum box; the hydrogen collecting tank is provided with a hydrogen concentration meter; the hydrogen collecting tank is provided with a stepping motor; a main pumping valve is arranged at an air inlet of the vacuum pumping set; the vacuum box is provided with a vacuum gauge and a hydrogen pressure transmitter; the vacuum gauge is mounted on the top wall of the vacuum box; the hydrogen pressure transmitter is arranged on the top wall of the vacuum box; the electrical control system comprises a PLC controller; the vacuum box is provided with a sealing door; the sealing door is connected with the vacuum box sealing switch through a door opening mechanism; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure gauge; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen flowmeter; the signal input end of the PLC is electrically connected with the signal output end of the nitrogen pressure gauge; the signal input end of the PLC is electrically connected with the signal output end of the nitrogen flowmeter; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen-nitrogen mixed gas pressure transmitter; the signal input end of the PLC is electrically connected with the signal output end of the vacuum gauge; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure transmitter; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen leak detector; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen concentration meter; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen pressure regulating unit; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen electromagnetic valve; the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen pressure adjusting unit; the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen electromagnetic valve; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas pressure regulating unit; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas electromagnetic valve; the PLC controller control signal output end is electrically connected with the control signal input end of the stepping motor; the control signal output end of the PLC is electrically connected with the control signal input end of the vacuumizing pump set; the control signal output end of the PLC is electrically connected with the control signal input end of the main pumping valve; the control signal output end of the PLC is electrically connected with the control signal input end of the leak detection electromagnetic valve; the PLC controller control signal output end is electrically connected with the control signal input end of the molecular pump; the control signal output end of the PLC is electrically connected with the control signal input end of the angle valve; the control signal output end of the PLC is electrically connected with the control signal input end of the door opening mechanism; the PLC is located in the control cabinet, so that the performance is stable, the installation and maintenance are convenient, the PLC is controlled in a full computer mode, the full-automatic detection and automatic judgment are achieved, the misjudgment caused by human factors of operators is eliminated, the performance is reliable, the practicability is high, and the operation is simple.
3. The technical scheme is that the hydrogen-nitrogen mixed gas tank (for evacuating workpieces, filling hydrogen, nitrogen and the like) comprises a tank body, a spiral mixer, a magnetic fluid, a coupler and a bracket; the tank body is in a cylinder shape; one end of the cylinder body is sealed by a hemispherical surface; the other end of the cylinder body is sealed by a plane; the center of the plane is provided with a shaft hole; the tank body is in sealed rotary connection with the magnetic fluid by means of the shaft hole; the inner end of the magnetic fluid is coaxially and fixedly connected with the spiral mixer; the outer end of the magnetic fluid is in transmission connection with the stepping motor through a coupler; the stepping motor is fixedly connected with the tank body through the bracket, so that hydrogen and nitrogen are uniformly mixed in a closed environment, and the safety and reliability of hydrogen-nitrogen mixed gas are improved.
The invention aims to solve the second technical problem of providing an operation method of a vacuum box hydrogen leakage detection system.
In order to solve the second technical problem, the method for operating the vacuum box hydrogen leak detection system of the present invention comprises the steps of,
the first step is as follows: and placing the workpiece to be detected into a vacuum box and installing a workpiece joint tool.
The second step is that: the system automatically closes the door to operate by pressing a start button.
The third step: the vacuum chamber is vacuumized to 100Pa, and meanwhile, the workpiece is filled with nitrogen gas of 0-5 MPA.
The fourth step: and (5) detecting the large leakage for 30-60 seconds at 100Pa-500Pa, and judging whether the large leakage is qualified or not.
The fifth step: if the large missing is detected to be qualified,
the workpiece to be inspected is filled with 4% hydrogen and 96% nitrogen.
And opening the leak detection valve to perform micro-leakage detection, and judging whether the micro-leakage detection is qualified.
If the micro-leakage detection is qualified,
the vacuum box and the workpiece are vented.
And taking out the workpiece.
The following set of assays was performed.
If the detection of the microleakage is not qualified,
the vacuum chamber is vented.
And taking out the workpiece.
And searching for a leak point by using a suction gun.
If the large missing detection is not qualified,
the vacuum chamber is vented.
And taking out the workpiece.
Compared with the prior art, the operation method of the vacuum box hydrogen leakage detection system has the following beneficial effects.
The operation method of the vacuum box hydrogen leak detection system comprises the following steps: putting a workpiece to be detected into a vacuum box and installing a workpiece joint tool; the second step is that: pressing a starting button to automatically close the door of the system for operation; the third step: vacuumizing the vacuum chamber to 100Pa, and simultaneously filling nitrogen gas into the workpiece for 0-5 MPA; the fourth step: detecting the large leakage for 30-60 seconds at 100Pa-500Pa, and judging whether the large leakage is qualified or not; the fifth step: if the large leakage is detected to be qualified, 4% of hydrogen and 96% of nitrogen are filled into the workpiece to be detected; opening a leak detection valve to perform micro-leakage detection, and judging whether the micro-leakage detection is qualified or not; if the micro-leakage detection is qualified, the vacuum box and the workpiece are emptied; taking out the workpiece; carrying out the following group detection; if the micro-leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; searching for a leak point by using a suction gun; if the large leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; or the technical means of foam inspection and maintenance is utilized, so the operation is convenient, the vacuum leak detection can be realized only by mixing hydrogen and nitrogen and feeding the mixture into a workpiece without helium, the cost is low, the maintenance is convenient, the popularization and the application of the system operation method are facilitated, and the safety and the reliability of the system are ensured.
Drawings
The vacuum box hydrogen leak detection system and the method of operating the same of the present invention are described in further detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic diagram of the constitution of a vacuum box hydrogen leak detection system of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the vacuum box hydrogen leak detection system of the present invention.
FIG. 3 is a schematic diagram of a top view of a vacuum box hydrogen leak detection system of the present invention.
FIG. 4 is a schematic view of the structure of the gas charging system of the vacuum box hydrogen leak detection system of the present invention.
Fig. 5 is a schematic view of the external structure of the hydrogen-nitrogen mixed gas tank of the vacuum box hydrogen leak detection system of the present invention.
Fig. 6 is a schematic sectional structural view of a hydrogen-nitrogen mixed gas tank of the vacuum box hydrogen leakage detection system of the present invention.
FIG. 7 is a schematic diagram showing the linkage relationship between the sensing components and the executive components of the vacuum box hydrogen leak detection system and the electrical control system.
FIG. 8 is a flow chart of the operation of the vacuum box hydrogen leak detection system of the present invention.
The reference numerals are explained below.
1-hydrogen cylinder;
1-hydrogen pressure gauge;
1-2-hydrogen pressure adjusting unit;
1-3-hydrogen flowmeter;
1-4-hydrogen solenoid valve;
2-nitrogen cylinder;
2-1-nitrogen pressure gauge;
2-nitrogen pressure adjusting unit;
2-3-nitrogen gas flowmeter;
2-4-nitrogen electromagnetic valve;
3-hydrogen-nitrogen mixed gas tank;
3-1-hydrogen-nitrogen mixed gas pressure transmitter;
3-2-hydrogen-nitrogen mixed gas pressure adjusting unit;
3-hydrogen-nitrogen mixed gas electromagnetic valve;
3-4 parts of a tee joint part;
3-5 to a step motor;
3-6 to a tank body;
3-7-spiral mixer;
3-8-magnetofluid;
3-9-coupler;
3-10 to support;
4-vacuum box;
4-1-door opening mechanism;
5, detecting a workpiece;
6-vacuumizing pump set;
6-1-main pumping valve;
6-2 to a vacuum gauge;
6-3-hydrogen pressure transmitter;
7-hydrogen leak detector;
7-1-leakage detection electromagnetic valve;
7-2-hydrogen collecting tank;
7-3-hydrogen concentration meter;
7-4 to a molecular pump;
7-5-angle valve;
8, controlling a cabinet;
9-PLC controller.
Detailed Description
As shown in fig. 1 to 4, the present invention provides a vacuum box hydrogen leak detection system, which includes a mechanical system and an electrical control system, wherein a signal output end of a sensing element in the mechanical system is electrically connected to a signal input end in the electrical control system, and a control signal input end of an execution element in the mechanical system is electrically connected to a control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are communicated with each other; the gas charging system comprises a hydrogen cylinder 1 and a nitrogen cylinder 2; the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank 3; the vacuum box system comprises a vacuum box 4 and a vacuumizing pump set 6; the hydrogen leakage detection system comprises a hydrogen leakage detector 7; the gas outlet intercommunication of hydrogen cylinder 1 the air inlet of hydrogen nitrogen mist jar 3, the gas outlet intercommunication of nitrogen cylinder 2 the air inlet of hydrogen nitrogen mist jar 3, the gas outlet of hydrogen nitrogen mist jar 3 penetrates in proper order sealedly through the pipeline in vacuum chamber 4 and the work piece 5 of being examined, the air inlet of hydrogen leak detector 7 pass through the pipeline with the sealed intercommunication of vacuum chamber 4, evacuation pump package 6 through the main line with the sealed intercommunication of vacuum chamber 4, evacuation pump package 6 penetrates in sealed through other pipeline in vacuum chamber 4 and with the sealed intercommunication of work piece 5 of being examined.
In the embodiment, the vacuum box hydrogen leakage detection system comprises a mechanical system and an electrical control system, wherein a signal output end of a sensing element in the mechanical system is electrically connected with a signal input end in the electrical control system, and a control signal input end of an execution element in the mechanical system is electrically connected with a control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are mutually communicated (the control system has clear layers and is convenient to operate); the gas charging system comprises a hydrogen cylinder and a nitrogen cylinder; the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank; the vacuum box system comprises a vacuum box and a vacuumizing pump set; the hydrogen leakage detection system comprises a hydrogen leakage detector; the gas outlet intercommunication of hydrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet intercommunication of nitrogen cylinder the air inlet of hydrogen nitrogen mist jar, the gas outlet of hydrogen nitrogen mist jar penetrates in proper order sealedly through the pipeline in vacuum chamber with by in the work piece, the air inlet of hydrogen leak detector pass through the pipeline with the sealed intercommunication of vacuum chamber, the evacuation pump package pass through the main line with the sealed intercommunication of vacuum chamber, the evacuation pump package penetrates through other pipeline sealedly in the vacuum chamber and with the technical means who is by the sealed intercommunication of work piece, so, only through mixing hydrogen and nitrogen gas and send into the work piece in, need not use the helium can realize the vacuum leak hunting, low cost, it is convenient to maintain, is favorable to the popularization and application of system.
As shown in fig. 2 to 4 and 7, a hydrogen pressure gauge 1-1 is disposed at the gas outlet of the hydrogen cylinder 1 (shown in fig. 2) according to the present embodiment; a hydrogen pressure adjusting unit 1-2, a hydrogen flowmeter 1-3 and a hydrogen electromagnetic valve 1-4 are sequentially communicated between the hydrogen cylinder 1 and the hydrogen-nitrogen mixed gas tank 3 in series; a nitrogen pressure gauge 2-1 is arranged at the air outlet of the nitrogen cylinder 2; a nitrogen pressure adjusting unit 2-2, a nitrogen flowmeter 2-3 and a nitrogen electromagnetic valve 2-4 are sequentially communicated between the nitrogen cylinder 2 and the hydrogen-nitrogen mixed gas tank 3 in series; the hydrogen cylinder 1, the nitrogen cylinder 2 and the hydrogen-nitrogen mixed gas tank 3 are communicated through a three-way component 3-4; a hydrogen-nitrogen mixed gas pressure regulating unit 3-2 and a hydrogen-nitrogen mixed gas electromagnetic valve 3-3 are sequentially connected in series between the hydrogen-nitrogen mixed gas tank 3 and the vacuum box 4; a hydrogen collecting tank 7-2, a molecular pump 7-4 and a leak detection electromagnetic valve 7-1 are sequentially communicated between the hydrogen leak detector 7 and the vacuum box 4 in series (as shown in fig. 3); a plurality of angle valves 7-5 are arranged at the outlet of a pipeline for communicating the hydrogen leak detector 7 with the vacuum box 4; the outlets of a plurality of the angle valves 7-5 are communicated with the vacuum box 4; the outlets of the angle valves 7-5 are communicated with the top wall of the vacuum box 4; the hydrogen collecting tank 7-2 is provided with a hydrogen concentration meter 7-3; the hydrogen collecting tank 7-2 is provided with a stepping motor 3-5; the air inlet of the vacuumizing pump unit 6 is provided with a main vacuumizing valve 6-1; (as shown in fig. 4) the vacuum box 4 is provided with a vacuum gauge 6-2 and a hydrogen pressure transmitter 6-3; the vacuum gauge 6-2 is installed on the top wall of the vacuum box 4; the hydrogen pressure transmitter 6-3 is mounted on the top wall of the vacuum box 4; the electrical control system comprises a PLC controller 9; the vacuum box 4 is provided with a sealing door; the sealing door is connected with the vacuum box 4 through a door opening mechanism 4-1 in a sealing way; (as shown in fig. 7) the signal input end of the PLC controller 9 is electrically connected with the signal output end of the hydrogen pressure gauge 1-1; the signal input end of the PLC 9 is electrically connected with the signal output end of the hydrogen flowmeter 1-3; the signal input end of the PLC 9 is electrically connected with the signal output end of the nitrogen pressure gauge 2-1; the signal input end of the PLC 9 is electrically connected with the signal output end of the nitrogen flowmeter 2-3; the signal input end of the PLC 9 is electrically connected with the signal output end of the hydrogen-nitrogen mixed gas pressure transmitter 3-1; the signal input end of the PLC 9 is electrically connected with the signal output end of the vacuum gauge 6-2; the signal input end of the PLC 9 is electrically connected with the signal output end of the hydrogen pressure transmitter 6-3; the signal input end of the PLC 9 is electrically connected with the signal output end of the hydrogen leak detector 7; the signal input end of the PLC 9 is electrically connected with the signal output end of the hydrogen concentration meter 7-3; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the hydrogen pressure regulating unit 1-2; the control signal output end of the PLC 9 is electrically connected with the control signal input ends of the hydrogen electromagnetic valves 1-4; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the nitrogen pressure adjusting unit 2-2; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the nitrogen electromagnetic valve 2-4; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas pressure regulating unit 3-2; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas electromagnetic valve 3-3; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the stepping motor 3-5; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the vacuumizing pump unit 6; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the main pumping valve 6-1; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the leak detection electromagnetic valve 7-1; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the molecular pump 7-4; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the angle valve 7-5; the control signal output end of the PLC 9 is electrically connected with the control signal input end of the door opening mechanism 4-1; the PLC controller 9 is positioned in the control cabinet 8.
In the embodiment, the hydrogen pressure gauge is arranged at the gas outlet of the hydrogen cylinder; a hydrogen pressure adjusting unit, a hydrogen flowmeter and a hydrogen electromagnetic valve are sequentially communicated between the hydrogen cylinder and the hydrogen-nitrogen mixed gas tank in series; a nitrogen pressure gauge is arranged at the air outlet of the nitrogen bottle; a nitrogen pressure adjusting unit, a nitrogen flowmeter and a nitrogen electromagnetic valve are sequentially communicated between the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank in series; the hydrogen cylinder, the nitrogen cylinder and the hydrogen-nitrogen mixed gas tank are communicated through a three-way component; a hydrogen-nitrogen mixed gas pressure regulating unit and a hydrogen-nitrogen mixed gas electromagnetic valve are sequentially connected between the hydrogen-nitrogen mixed gas tank and the vacuum box in series; a hydrogen collecting tank, a molecular pump and a leak detection electromagnetic valve are sequentially communicated between the hydrogen leak detector and the vacuum box in series; a pipeline outlet for communicating the hydrogen leak detector with the vacuum box is provided with a plurality of angle valves; the outlets of the angle valves are communicated with the vacuum box; the outlets of the angle valves are communicated with the top wall of the vacuum box; the hydrogen collecting tank is provided with a hydrogen concentration meter; the hydrogen collecting tank is provided with a stepping motor; a main pumping valve is arranged at an air inlet of the vacuum pumping set; the vacuum box is provided with a vacuum gauge and a hydrogen pressure transmitter; the vacuum gauge is mounted on the top wall of the vacuum box; the hydrogen pressure transmitter is arranged on the top wall of the vacuum box; the electrical control system comprises a PLC controller; the vacuum box is provided with a sealing door; the sealing door is connected with the vacuum box sealing switch through a door opening mechanism; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure gauge; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen flowmeter; the signal input end of the PLC is electrically connected with the signal output end of the nitrogen pressure gauge; the signal input end of the PLC is electrically connected with the signal output end of the nitrogen flowmeter; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen-nitrogen mixed gas pressure transmitter; the signal input end of the PLC is electrically connected with the signal output end of the vacuum gauge; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen pressure transmitter; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen leak detector; the signal input end of the PLC is electrically connected with the signal output end of the hydrogen concentration meter; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen pressure regulating unit; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen electromagnetic valve; the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen pressure adjusting unit; the control signal output end of the PLC is electrically connected with the control signal input end of the nitrogen electromagnetic valve; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas pressure regulating unit; the control signal output end of the PLC is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas electromagnetic valve; the PLC controller control signal output end is electrically connected with the control signal input end of the stepping motor; the control signal output end of the PLC is electrically connected with the control signal input end of the vacuumizing pump set; the control signal output end of the PLC is electrically connected with the control signal input end of the main pumping valve; the control signal output end of the PLC is electrically connected with the control signal input end of the leak detection electromagnetic valve; the PLC controller control signal output end is electrically connected with the control signal input end of the molecular pump; the control signal output end of the PLC is electrically connected with the control signal input end of the angle valve; the control signal output end of the PLC is electrically connected with the control signal input end of the door opening mechanism; the PLC is located in the control cabinet, so that the performance is stable, the installation and maintenance are convenient, the PLC is controlled in a full computer mode, the full-automatic detection and automatic judgment are achieved, the misjudgment caused by human factors of operators is eliminated, the performance is reliable, the practicability is high, and the operation is simple.
As shown in fig. 5 and 6, the hydrogen-nitrogen mixed gas tank 3 of the present embodiment includes a tank body 3-6, a spiral mixer 3-7, a magnetic fluid 3-8, a coupling 3-9, and a bracket 3-10; the tank bodies 3 to 6 are cylindrical; one end of the cylinder body is sealed by a hemispherical surface; the other end of the cylinder body is sealed by a plane; the center of the plane is provided with a shaft hole; the tank body 3-6 is in sealed rotary connection with the magnetic fluid 3-8 by virtue of the shaft hole; the inner end of the magnetic fluid 3-8 is coaxially and fixedly connected with the spiral mixer 3-7; the outer end of the magnetic fluid 3-8 is in transmission connection with the stepping motor 3-5 through a coupler 3-9; the stepping motor 3-5 is fixedly connected with the tank body 3-6 through a support 3-10.
The embodiment adopts the hydrogen-nitrogen mixed gas tank to evacuate the workpiece, fill hydrogen, nitrogen and the like, and comprises a tank body, a spiral mixer, a magnetic fluid, a coupler and a bracket; the tank body is in a cylinder shape; one end of the cylinder body is sealed by a hemispherical surface; the other end of the cylinder body is sealed by a plane; the center of the plane is provided with a shaft hole; the tank body is in sealed rotary connection with the magnetic fluid by means of the shaft hole; the inner end of the magnetic fluid is coaxially and fixedly connected with the spiral mixer; the outer end of the magnetic fluid is in transmission connection with the stepping motor through a coupler; the stepping motor is fixedly connected with the tank body through the bracket, so that hydrogen and nitrogen are uniformly mixed in a closed environment, and the safety and reliability of hydrogen-nitrogen mixed gas are improved.
As shown in fig. 8, the first step of the present embodiment: putting a workpiece to be detected into a vacuum box and installing a workpiece joint tool; the second step is that: pressing a starting button to automatically close the door of the system for operation; the third step: vacuumizing the vacuum chamber to 100Pa, and simultaneously filling nitrogen gas into the workpiece for 0-5 MPA; the fourth step: detecting the large leakage for 30-60 seconds at 100Pa-500Pa, and judging whether the large leakage is qualified or not; the fifth step: if the large leakage is detected to be qualified, 4% of hydrogen and 96% of nitrogen are filled into the workpiece to be detected; opening a leak detection valve to perform micro-leakage detection, and judging whether the micro-leakage detection is qualified or not; if the micro-leakage detection is qualified, the vacuum box and the workpiece are emptied; taking out the workpiece; carrying out the following group detection; if the micro-leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; searching for a leak point by using a suction gun; if the large leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; alternatively, the repair is checked using foam.
The operation method of the vacuum box hydrogen leak detection system comprises the following steps: putting a workpiece to be detected into a vacuum box and installing a workpiece joint tool; the second step is that: pressing a starting button to automatically close the door of the system for operation; the third step: vacuumizing the vacuum chamber to 100Pa, and simultaneously filling nitrogen gas into the workpiece for 0-5 MPA; the fourth step: detecting the large leakage for 30-60 seconds at 100Pa-500Pa, and judging whether the large leakage is qualified or not; the fifth step: if the large leakage is detected to be qualified, 4% of hydrogen and 96% of nitrogen are filled into the workpiece to be detected; opening a leak detection valve to perform micro-leakage detection, and judging whether the micro-leakage detection is qualified or not; if the micro-leakage detection is qualified, the vacuum box and the workpiece are emptied; taking out the workpiece; carrying out the following group detection; if the micro-leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; searching for a leak point by using a suction gun; if the large leakage detection is unqualified, the vacuum chamber is emptied; taking out the workpiece; or the technical means of foam inspection and maintenance is utilized, so the operation is convenient, the vacuum leak detection can be realized only by mixing hydrogen and nitrogen and feeding the mixture into a workpiece without helium, the cost is low, the maintenance is convenient, the popularization and the application of the system operation method are facilitated, and the safety and the reliability of the system are ensured.
As a further refinement of the present embodiment, the technical parameter indexes of the vacuum box hydrogen leak detection system are as follows:
1. size of the vacuum box: 1500mm deep and 1000mm wide and 1500mm (workpiece to be inspected: 945mm deep and 622mm wide and 1210mm high);
2. detecting the maximum inflation pressure: 4.5 Mpa;
3. leak detection beat: less than 17-27min per piece (theoretical data);
4. the detectable leakage rate of the detected workpiece is as follows: 1.0X 10-5Pa·m3/S-1.0×10-8Pa·m3(ii)/S (tunable);
5. the large leakage detection and the small leakage detection of the detected workpiece can be realized in the vacuum box chamber;
6. detection time of pressure in the vacuum box chamber: adjusting for 40-60 min;
7. pre-vacuumizing: less than or equal to 100 and 1000Pa (adjustable);
8. the self leakage rate of the system: less than or equal to 10-11Pa·m3/s；
9. Response time of hydrogen leak detector: 1 second;
10. the opening and closing modes of the door opening mechanism of the vacuum box are as follows: automatic;
11. the hydrogen flowmeter and the hydrogen pressure gauge are used for monitoring the concentration and the pressure of the hydrogen and automatically supplementing the hydrogen;
12. the method comprises three operation modes of automation, manual operation and debugging;
13. the electric control system has the functions of self detection, interlocking protection and alarm, and ensures the safe and reliable operation of the system and the safety of the detected workpiece.
Claims (2)
1. The utility model provides a vacuum box hydrogen leak hunting system which characterized in that: the mechanical system comprises a mechanical system and an electrical control system, wherein a signal output end of a sensing component in the mechanical system is electrically connected with a signal input end in the electrical control system, and a control signal input end of an execution component in the mechanical system is electrically connected with a control signal output end in the electrical control system; the mechanical system comprises a vacuum box system, a hydrogen-nitrogen mixing system, a hydrogen leakage detecting system and an inflating system which are communicated with each other; the gas charging system comprises a hydrogen gas cylinder (1) and a nitrogen gas cylinder (2); the hydrogen-nitrogen mixing system comprises a hydrogen-nitrogen mixed gas tank (3); the vacuum box system comprises a vacuum box (4) and a vacuum pumping set (6); the hydrogen leakage detection system comprises a hydrogen leakage detector (7); the gas outlet of the hydrogen cylinder (1) is communicated with the gas inlet of the hydrogen-nitrogen mixed gas tank (3), the gas outlet of the nitrogen cylinder (2) is communicated with the gas inlet of the hydrogen-nitrogen mixed gas tank (3), the gas outlet of the hydrogen-nitrogen mixed gas tank (3) sequentially penetrates into the vacuum box (4) and the workpiece (5) to be detected in a sealing manner through pipelines, the gas inlet of the hydrogen leak detector (7) is communicated with the vacuum box (4) in a sealing manner through a pipeline, the vacuumizing pump set (6) is communicated with the vacuum box (4) in a sealing manner through a main pipeline, and the vacuumizing pump set (6) penetrates into the vacuum box (4) in a sealing manner through a side pipeline and is communicated with the workpiece (5) to be detected in a sealing manner;
a hydrogen pressure gauge (1-1) is arranged at the gas outlet of the hydrogen cylinder (1);
a hydrogen pressure adjusting unit (1-2), a hydrogen flowmeter (1-3) and a hydrogen electromagnetic valve (1-4) are sequentially communicated between the hydrogen cylinder (1) and the hydrogen-nitrogen mixed gas tank (3);
a nitrogen pressure gauge (2-1) is arranged at the air outlet of the nitrogen bottle (2);
a nitrogen pressure adjusting unit (2-2), a nitrogen flowmeter (2-3) and a nitrogen electromagnetic valve (2-4) are sequentially communicated between the nitrogen cylinder (2) and the hydrogen-nitrogen mixed gas tank (3);
the hydrogen cylinder (1), the nitrogen cylinder (2) and the hydrogen-nitrogen mixed gas tank (3) are communicated through a three-way component (3-4);
a hydrogen-nitrogen mixed gas pressure regulating unit (3-2) and a hydrogen-nitrogen mixed gas electromagnetic valve (3-3) are sequentially connected between the hydrogen-nitrogen mixed gas tank (3) and the vacuum box (4) in series;
a hydrogen collecting tank (7-2), a molecular pump (7-4) and a leak detection electromagnetic valve (7-1) are sequentially communicated between the hydrogen leak detector (7) and the vacuum box (4);
a plurality of angle valves (7-5) are arranged at the outlet of a pipeline for communicating the hydrogen leak detector (7) with the vacuum box (4);
the outlets of the angle valves (7-5) are communicated with the vacuum box (4);
the outlets of the angle valves (7-5) are communicated with the top wall of the vacuum box (4);
the hydrogen collecting tank (7-2) is provided with a hydrogen concentration meter (7-3);
the hydrogen collecting tank (7-2) is provided with a stepping motor (3-5);
the air inlet of the vacuumizing pump set (6) is provided with a main vacuumizing valve (6-1);
the vacuum box (4) is provided with a vacuum gauge (6-2) and a hydrogen pressure transmitter (6-3);
the vacuum gauge (6-2) is arranged on the top wall of the vacuum box (4);
the hydrogen pressure transmitter (6-3) is arranged on the top wall of the vacuum box (4);
the electrical control system comprises a PLC (9);
the vacuum box (4) is provided with a sealing door;
the sealing door is connected with the vacuum box (4) through a door opening mechanism (4-1) in a sealing way;
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen pressure gauge (1-1);
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen flowmeter (1-3);
the signal input end of the PLC (9) is electrically connected with the signal output end of the nitrogen pressure gauge (2-1);
the signal input end of the PLC (9) is electrically connected with the signal output end of the nitrogen flowmeter (2-3);
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen-nitrogen mixed gas pressure transmitter (3-1);
the signal input end of the PLC (9) is electrically connected with the signal output end of the vacuum gauge (6-2);
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen pressure transmitter (6-3);
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen leak detector (7);
the signal input end of the PLC (9) is electrically connected with the signal output end of the hydrogen concentration meter (7-3);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the hydrogen pressure regulating unit (1-2);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the hydrogen electromagnetic valve (1-4);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the nitrogen pressure regulating unit (2-2);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the nitrogen electromagnetic valve (2-4);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas pressure regulating unit (3-2);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the hydrogen-nitrogen mixed gas electromagnetic valve (3-3);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the stepping motor (3-5);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the vacuumizing pump set (6);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the main pumping valve (6-1);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the leakage detection electromagnetic valve (7-1);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the molecular pump (7-4);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the angle valve (7-5);
the control signal output end of the PLC (9) is electrically connected with the control signal input end of the door opening mechanism (4-1);
the PLC (9) is positioned in the control cabinet (8);
the hydrogen-nitrogen mixed gas tank (3) comprises a tank body (3-6), a spiral mixer (3-7), a magnetic fluid (3-8), a coupler (3-9) and a support (3-10);
the tank body (3-6) is in a cylinder shape;
one end of the cylinder body is sealed by a hemispherical surface;
the other end of the cylinder body is sealed by a plane;
the center of the plane is provided with a shaft hole;
the tank body (3-6) is in sealed rotary connection with the magnetic fluid (3-8) by virtue of the shaft hole;
the inner end of the magnetic fluid (3-8) is coaxially and fixedly connected with the spiral mixer (3-7);
the outer end of the magnetic fluid (3-8) is in transmission connection with the stepping motor (3-5) through a coupler (3-9);
the stepping motor (3-5) is fixedly connected with the tank body (3-6) through a bracket (3-10).
2. A method of operating a vacuum box hydrogen leak detection system according to claim 1, characterized by: comprises the following steps of (a) carrying out,
the first step is as follows: putting a workpiece to be detected into a vacuum box and installing a workpiece joint tool;
the second step is that: pressing a starting button to automatically close the door of the system for operation;
the third step: vacuumizing the vacuum chamber to 100Pa, and simultaneously filling nitrogen gas into the workpiece for 0-5 MPA;
the fourth step: detecting the large leakage for 30-60 seconds at 100Pa-500Pa, and judging whether the large leakage is qualified or not;
the fifth step: if the large missing is detected to be qualified,
filling 4% of hydrogen and 96% of nitrogen into the workpiece to be detected;
opening a leak detection valve to perform micro-leakage detection, and judging whether the micro-leakage detection is qualified or not;
if the micro-leakage detection is qualified,
the vacuum box and the workpiece are emptied;
taking out the workpiece;
carrying out the following group detection;
if the detection of the microleakage is not qualified,
the vacuum chamber is vented;
taking out the workpiece;
searching for a leak point by using a suction gun;
if the large missing detection is not qualified,
the vacuum chamber is vented;
and taking out the workpiece.
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| CN110763413A (en) * | 2019-10-16 | 2020-02-07 | 顺德职业技术学院 | Product leakage detection device and detection method |
| CN110967152A (en) * | 2019-12-31 | 2020-04-07 | 江门龙浩智能装备有限公司 | Heat exchanger leak detection device and heat exchanger leak detection method |
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