CN111365612B - Air inlet system of remote helium-spraying method leak detection controllable spray gun - Google Patents
Air inlet system of remote helium-spraying method leak detection controllable spray gun Download PDFInfo
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- CN111365612B CN111365612B CN202010169007.1A CN202010169007A CN111365612B CN 111365612 B CN111365612 B CN 111365612B CN 202010169007 A CN202010169007 A CN 202010169007A CN 111365612 B CN111365612 B CN 111365612B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- G—PHYSICS
- 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
- G01M3/202—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 using mass spectrometer detection systems
Abstract
The invention discloses an air inlet system of a remote helium spray method leak detection controllable spray gun and a use method thereof, wherein the air inlet system comprises an air inlet main pipe, a plurality of branch pipes with different diameters and an air outlet pipe, the plurality of branch pipes are arranged between the air inlet main pipe and the air outlet pipe in parallel, the air inlet main pipe is provided with a first pressure sensor, and the part of each branch pipe, which is close to the air outlet pipe, is provided with a second pressure sensor; the gas inlet manifold is externally connected with a helium source device, and the gas outlet pipe is externally connected with a spray gun head. The using method of the device comprises the steps of introducing helium with different quantities by arranging a plurality of branch pipes with different diameters, enabling the sprayed helium mass to accurately fall into a preset range, and simultaneously detecting pressure values at an air inlet and an air outlet by utilizing a first pressure sensor and a second pressure sensor to ensure that the amount and duration time of the helium sprayed each time are constant. The invention realizes the constant consistency of the flow and the duration of helium in the conveying process, improves the quantitative comparison analysis of helium-spraying leak detection, effectively compares and judges the sizes and the leak rates of leak holes at different positions to be detected, and reduces accidental errors.
Description
Technical Field
The invention relates to the technical field of vacuum system leak detection, in particular to an air inlet system of a remote helium spray method leak detection controllable spray gun.
Background
The pressures encountered in accelerator vacuum systems are very low and it is not easy to measure their pressure effects directly. Leak detection is an important step in accelerator vacuum acquisition, where if a predetermined ultimate vacuum is not drawn, the primary cause is the presence of a leak, except due to outgassing of materials and improper operation of the pump. Commonly used leak detection methods for accelerator vacuum systems include helium mass spectrometer leak detection, quadrupole mass spectrometer leak detection, and vacuum gauge leak detection. The helium mass spectrometer leak detection method is quantitative measurement, gas with different mass quantities is separated by utilizing a magnetic deflection principle, helium is used as leak indicating gas, and whether the system leaks or not is judged by ion collection and observation of the size of helium ion flow. Helium mass spectrometer leak detection methods are classified into conventional helium spray methods and positive pressure pipette methods, and among them, the helium spray method is widely used because of its simple and reliable operation.
In the helium spray method leak detection process, the response time of helium at each leak detection position needs to be estimated, if the vacuum pipeline is longer, the helium signal appearance time is slower, and because the necessary time is spent for waiting for the maximum leak signal to appear, the leak detection worker often troubles plausible leak holes in the helium spray operation, and the leak detection efficiency and accuracy are greatly influenced.
In the current actual leak detection operation, a helium source or a helium gun used often forms helium concentration distribution with uncertain concentration and uncertain gradient in a space far larger than a helium spraying area, and accurate positioning and quantification of a leak point are difficult to realize. Helium at different positions and different time cannot be distributed uniformly and have uniform concentration, so that comparison and judgment of multiple leak points cannot be performed. Meanwhile, the concentration of the helium source can cause inconsistency along with the time extension, the reaction of the helium mass spectrometer leak detector can also generate larger change and change, and the effective judgment of the size of the leak hole is difficult to provide.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the air inlet system of the remote helium spray method leak detection controllable spray gun, which has high leak detection accuracy, more ideal leak detection effect and high flexibility.
The invention also aims to provide a using method of the air inlet system of the remote helium spray method leak detection controllable spray gun.
The technical scheme of the invention is as follows: a gas inlet system of a controllable spray gun for detecting leakage by a remote helium spraying method comprises a gas inlet main pipe, a plurality of branch pipes with different diameters and a gas outlet pipe, wherein the plurality of branch pipes are arranged between the gas inlet main pipe and the gas outlet pipe in parallel; the gas inlet manifold is externally connected with a helium source device, and the gas outlet pipe is externally connected with a spray gun head. The input quantity of helium is adjusted by arranging branch pipes with different diameters, so that the size of a helium cluster sprayed by a spray gun is controlled, helium is introduced into a small area at the position near a leak hole on the surface of equipment to be detected, and the leak detection accuracy is improved. The first pressure sensor and the second pressure sensor are used for measuring and monitoring helium pressures at the gas inlet and the gas outlet in real time, so that helium constant pressure and constant concentration can be adjusted and controlled conveniently, helium concentration is ensured to be constant along with time, the reaction and reading stability of the helium mass spectrometer can be improved, certain helium spraying time and concentration flow rate can be accurately controlled, and the method can be used for comparing and judging multiple leak points of large-scale equipment.
The length of air inlet main is more than 3 times of the pipe diameter of air inlet main, the length of each branch pipe is more than 3 times of the pipe diameter of the corresponding branch pipe, and the length of the air outlet pipe is more than 3 times of the pipe diameter of the air outlet pipe, so that the accuracy of measuring numerical values of the first pressure sensor and the second pressure sensor can be effectively guaranteed.
The air outlet pipe is an oxygen-free copper pipe, and the diameter of the air outlet pipe is set according to the drift diameter of the electromagnetic valve selected on the pipeline. The air outlet pipe is made of an oxygen-free copper pipe, so that operations such as field bending and the like can be performed according to the requirements of detected equipment during leakage detection conveniently, the air outlet pipe is adaptive to a detection space, and the use flexibility is improved.
The air inlet main pipe is a PVC pipe, and the diameter of the air inlet main pipe is set according to the drift diameter of the electromagnetic valve selected on the pipeline.
The number of the branch pipes is two, and the branch pipes are respectively PVC pipes; the diameter of one branch pipe is 1.5-3 times of the diameter of the other branch pipe, and the specific value of the diameter of each branch pipe can be set correspondingly according to the drift diameter of the electromagnetic valve selected on the corresponding pipeline.
The air inlet main pipe is connected with the two branch pipes through a normally closed three-way timing electromagnetic valve; the air outlet pipe is connected with the two branch pipes through a tee reducing PU joint.
The air inlet main pipe is of a multi-section structure and comprises a plurality of air inlet branch pipes which are connected in sequence, any two adjacent air inlet branch pipes are connected through a PU joint, and the PU joint comprises a three-way reducing PU joint and/or a straight-through PU joint; the first pressure sensor is connected with the two air inlet branch pipes through a three-way reducing PU joint at the position where the first pressure sensor is arranged; and at the position without the first pressure sensor, the two air inlet branch pipes are connected through a straight-through PU joint.
The branch pipe is also of a multi-section structure and comprises a plurality of branch pipes which are sequentially connected, any two adjacent branch pipes are connected through PU joints, and the PU joints comprise three-way reducing PU joints and/or straight PU joints; the second pressure sensor is connected with the two branch pipes through a tee reducing PU joint at the position where the second pressure sensor is arranged; and the two branch pipes are connected through a straight PU joint at the position without the second pressure sensor.
In above-mentioned intake pipe and each branch pipe, the PVC pipe that adopts is the PVC hose, connects through the PU joint between the multistage PVC hose on intake pipe or the same branch pipe, adopts the connected mode of direct plug can, the operation is swift, according to the actual distance between being detected equipment and the helium source, the length of adjustable pipeline is promptly to the festival number of adjustment PVC hose, can effectively improve the flexibility that the spray gun used.
And the branch pipes are also provided with normally closed two-way timing electromagnetic valves, and the outer diameter drift diameter of each two-way timing electromagnetic valve is equal to the pipe diameter of the corresponding branch pipe.
The two-way timing electromagnetic valve and the three-way timing electromagnetic valve are normally closed electromagnetic valves, corresponding valve channels are opened according to detection requirements during use, and in the three-way timing electromagnetic valve, the direction of air flow is changed through the on-off electric switcher interface, so that the air flow enters different branch pipes.
The first pressure sensor and the second pressure sensor can measure and monitor helium pressure entering the controllable spray gun, and are connected to an upper computer through standard USB connector terminals for data recording, storage, control and the like.
The invention relates to a use method of an air inlet system of a remote helium spray method leak detection controllable spray gun, which is characterized in that a first pressure sensor is used for monitoring the pressure value of helium entering an air inlet main pipe in real time, a second pressure sensor is used for monitoring the pressure value of the helium entering an air outlet pipe in real time, and the pressure of the helium is kept stable; the specific method for detecting the leakage comprises the following steps:
(1) firstly, selecting and connecting a branch pipe with a larger pipe diameter, and enabling helium to enter an air outlet pipe through the branch pipe with the larger pipe diameter and spray out after the helium enters an air inlet main pipe;
(2) looking at equipment to be subjected to leak detection, and if the area sprayed by helium does not exceed a preset range, obtaining an accurate leak detection result; if the area sprayed by the helium is larger than the preset range, the helium possibly diffuses to cause the condition of false alarm of a leak hole;
(3) when the helium diffuses to cause the false alarm of the leakage hole, the branch pipe with larger pipe diameter is closed, the branch pipe with smaller pipe diameter is communicated with the pipe, and the helium enters the air inlet main pipe, enters the air outlet pipe through the branch pipe with smaller pipe diameter and is sprayed out;
(4) and (4) repeating the steps (2) to (3) until the leak detection result is accurate.
In the method, the pressure value range of the helium gas is generally 3-5 atm standard atmospheric pressure in the detection process.
The principle of the air inlet system of the remote helium spray method leak detection controllable spray gun and the using method thereof is as follows: according to the ideal spray gun, the spray gun head of the spray gun is required to have a small enough helium mass to ensure that helium is introduced into a leak hole accessory on the surface of the detected equipment in a small area, so that helium with different quantitative amounts can be introduced according to actual needs by arranging a plurality of branch pipes with different diameters, and the helium mass sprayed by the spray gun can accurately fall into a preset range; meanwhile, in the detection process, the helium concentration is kept constant along with the change of time, so that the reaction and the reading of the helium mass spectrometer are kept stable, therefore, the first pressure sensor and the second pressure sensor are arranged on the gas inlet main pipe and the branch pipes close to the gas outlet pipe, the pressure in the pipeline can be monitored in real time, the constant helium amount and the constant duration of each time of spraying are ensured, the readings at different positions can be compared, and the sizes and the leakage rates of different leakage holes can be effectively judged.
Compared with the prior art, the invention has the following beneficial effects:
when the air inlet system of the controllable spray gun for detecting the leakage by the remote helium spraying method and the using method thereof are applied to equipment leakage detection, helium with different quantitative amounts can be introduced according to the actual requirement of equipment to be detected, helium gas masses with required sizes can be accurately sprayed, meanwhile, the constant consistency of the flow and the duration of the helium gas in the conveying process is realized, the quantitative comparative analysis of the helium spraying method leakage detection is improved, the sizes and the leakage rates of leakage holes of different detected positions are effectively compared and judged, and accidental errors are reduced.
In the air inlet system of the remote helium spray method leak detection controllable spray gun, the lengths of the air inlet main pipe and the branch pipes can be adjusted according to actual needs, the air outlet pipe is made of an oxygen-free copper pipe, field bending and other operations can be carried out according to the requirements of detected equipment, the use flexibility of the controllable spray gun is effectively improved, the operation is convenient, and the application range is wider.
Drawings
Fig. 1 is a schematic structural diagram of an air inlet system of the remote helium spray method leak detection controllable spray gun.
Fig. 2 is a view in the direction a of fig. 1.
In the above figures, the components indicated by the respective reference numerals are as follows: the device comprises a main air inlet pipe 1, a first branch pipe 2, a second branch pipe 3, an air outlet pipe 4, a first pressure sensor 5, a second pressure sensor 6, a three-way reducing PU connector 7, a straight-through PU connector 8, a three-way timing electromagnetic valve 9 and a two-way timing electromagnetic valve 10.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
The embodiment provides an air inlet system of a remote helium spray method leak detection controllable spray gun and a using method thereof.
As shown in fig. 1 or fig. 2, the air inlet system of the remote helium spray method leak detection controllable spray gun comprises an air inlet main pipe 1, a first branch pipe 2, a second branch pipe 3, an air outlet pipe 4, a first pressure sensor 5, a second pressure sensor 6, a three-way reducing PU joint 7, a straight-through PU joint 8, a three-way timing electromagnetic valve 9 and a two-way timing electromagnetic valve 10.
The first branch pipe and the second branch pipe are arranged between the air inlet main pipe and the air outlet pipe in parallel, the air inlet main pipe is provided with a first pressure sensor, and the parts, close to the air outlet pipe, of the branch pipes are respectively provided with a second pressure sensor; the gas inlet manifold is externally connected with a helium source device, and the gas outlet pipe is externally connected with a spray gun head.
In this embodiment, as a preferred scheme, air intake main and first branch pipe are the PVC hose of diameter 12mm respectively, and the second branch pipe is the PVC hose of diameter 6mm, and the outlet duct is the oxygen-free copper pipe of diameter 4 mm.
The air inlet main pipe is connected with the first branch pipe and the second branch pipe through three-way timing electromagnetic valves, the two-way timing electromagnetic valves are arranged on the first branch pipe and the second branch pipe respectively, the three timing electromagnetic valves are normally closed electromagnetic valves, timing opening or closing can be achieved after the three timing electromagnetic valves are electrified, constant-time on-off of a helium pipeline is achieved, and the electromagnetic valves are connected with gas pipes of corresponding drift diameters through direct PU connectors.
The air inlet main pipe and the first pressure sensor, the first branch pipe and the second pressure sensor, the second branch pipe and the second pressure sensor, and the first branch pipe, the second branch pipe and the air outlet pipe are communicated through three-way reducing PU joints, and other joints on the first branch pipe and the second branch pipe are communicated through the PU joints.
When helium enters and is output from the helium source to the controllable spray gun, the pressure values of the air inlet part and the air outlet part are measured and monitored by the first pressure sensor and the second pressure sensor, and the adjustment and control of the constant concentration of the helium are realized. The accurate control of certain helium spraying time and concentration flow is used for comparing and judging a plurality of leakage points of the large-scale equipment.
The use method of the air inlet system of the remote helium spray method leak detection controllable spray gun comprises the following steps: when helium enters and is output from the helium source to the controllable spray gun, pressure values are measured and monitored through the first pressure sensor and the second pressure sensor, and the pressure of the helium is conveniently recorded and adjusted. Enabling helium output from the first pressure sensor to enter a three-way timing electromagnetic valve with the drift diameter of 12 mm; if the three-way timing electromagnetic valve is electrified, helium enters the first branch pipe, then is input into the two-way timing electromagnetic valve with the drift diameter of 12mm, and finally is sprayed out of a helium mass through the gas outlet pipe; if the three-way timing electromagnetic valve is powered off, helium enters the second branch pipe and then is input into the two-way timing electromagnetic valve with the drift diameter of 6mm, and finally helium gas balls are sprayed out of the gas outlet pipe. In the process, the on-off time and the mode of each timing electromagnetic valve can be set by users, and the setting range is generally more than or equal to 5 seconds. After helium passes through the first branch pipe and the second branch pipe which are different in diameter, due to the change of the flow rate of the helium, the size of helium clusters sprayed out of the gas outlet pipe is different, so that the sprayed area of the output helium is small and concentrated, the area is in a preset range as far as possible, and the condition that a leak hole is mistakenly reported due to diffusion of the helium during leak detection is prevented.
As mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. The gas inlet system of the controllable spray gun for detecting the leakage by the remote helium spraying method is characterized by comprising a gas inlet main pipe, a plurality of branch pipes with different diameters and a gas outlet pipe, wherein the plurality of branch pipes are arranged between the gas inlet main pipe and the gas outlet pipe in parallel; the gas inlet main pipe is externally connected with a helium source device, and the gas outlet pipe is externally connected with a spray gun head;
the pressure value of helium entering the air inlet main pipe is monitored in real time by the first pressure sensor, the pressure value of helium entering the air outlet pipe is monitored in real time by the second pressure sensor, and the pressure of the helium is kept stable; the specific method for detecting the leakage comprises the following steps:
(1) firstly, selecting and connecting a branch pipe with a larger pipe diameter, and enabling helium to enter an air outlet pipe through the branch pipe with the larger pipe diameter and spray out after the helium enters an air inlet main pipe;
(2) looking at equipment to be subjected to leak detection, and if the area sprayed by helium does not exceed a preset range, obtaining an accurate leak detection result; if the area sprayed by the helium is larger than the preset range, the helium possibly diffuses to cause the condition of false alarm of a leak hole;
(3) when the helium diffuses to cause the false alarm of the leakage hole, the branch pipe with larger pipe diameter is closed, the branch pipe with smaller pipe diameter is communicated with the pipe, and the helium enters the air inlet main pipe, enters the air outlet pipe through the branch pipe with smaller pipe diameter and is sprayed out;
(4) and (4) repeating the steps (2) to (3) until the leak detection result is accurate.
2. The gas inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the length of the gas inlet main pipe is more than 3 times of the pipe diameter of the gas inlet main pipe, the length of each branch pipe is more than 3 times of the pipe diameter of the corresponding branch pipe, and the length of the gas outlet pipe is more than 3 times of the pipe diameter of the gas outlet pipe.
3. The air inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the air outlet pipe is an oxygen-free copper pipe.
4. The air intake system of the remote helium spray leak detection controllable spray gun of claim 1, wherein the air intake manifold is a PVC pipe.
5. The air inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the number of the branch pipes is two, and the branch pipes are respectively PVC pipes; the diameter of one branch pipe is 1.5-3 times of the diameter of the other branch pipe.
6. The air inlet system of the remote helium spray method leak detection controllable spray gun according to claim 5, characterized in that the air inlet main pipe and the two branch pipes are connected through a normally closed three-way timing electromagnetic valve; the air outlet pipe is connected with the two branch pipes through a tee reducing PU joint.
7. The gas inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the gas inlet main pipe is of a multi-section structure and comprises a plurality of gas inlet branch pipes which are connected in sequence, any two adjacent gas inlet branch pipes are connected through PU joints, and the PU joints comprise three-way reducing PU joints and/or straight-through PU joints; the first pressure sensor is connected with the two air inlet branch pipes through a three-way reducing PU joint at the position where the first pressure sensor is arranged; and at the position without the first pressure sensor, the two air inlet branch pipes are connected through a straight-through PU joint.
8. The gas inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the branch pipe is also of a multi-section structure, and comprises a plurality of branch pipes which are connected in sequence, any two adjacent branch pipes are connected through PU joints, and the PU joints comprise three-way reducing PU joints and/or straight PU joints; the second pressure sensor is connected with the two branch pipes through a tee reducing PU joint at the position where the second pressure sensor is arranged; and the two branch pipes are connected through a straight PU joint at the position without the second pressure sensor.
9. The gas inlet system of the remote helium spray method leak detection controllable spray gun according to claim 1, characterized in that the branch pipes are further provided with normally closed two-way timing electromagnetic valves, and the outside diameter of each two-way timing electromagnetic valve is equal to the pipe diameter of the corresponding branch pipe.
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