CN215492309U - Helium nitrogen mixing arrangement for helium leak hunting - Google Patents

Abstract

The utility model relates to a helium mixing gas device, in particular to a helium-nitrogen mixing device for helium leak detection, which solves the problem of the helium mixing gas device. At least, including helium source, nitrogen gas source, high-pressure tank, low-pressure tank and compressor, link to each other between nitrogen gas source and the low-pressure tank and form first branch road, helium source links to each other with the low-pressure tank and forms the second branch road, link to each other between low-pressure tank and the high-pressure tank and form the pumping pipeline, the high-pressure tank outwards extends and forms the detection pipeline, be equipped with the densimeter on the detection pipeline, high-pressure tank and low-pressure tank punishment do not are equipped with first manometer and second manometer, pumping pipeline department is located to the compressor, and the high-pressure tank passes through the compressor and extracts the interior gas medium of low-pressure tank, be equipped with the fourth on-off valve between densimeter and the detection pipeline. Through PLC control, degree of automation is high, does not rely on manual operation, and the helium is extravagant few, greatly reduced use cost, and principle and simple structure make things convenient for personnel to maintain.

Description

Helium nitrogen mixing arrangement for helium leak hunting

Technical Field

The utility model relates to a helium mixed gas device, in particular to a helium-nitrogen mixing device for helium leak detection.

Background

In helium leak detection systems, the requirement to fill the interior of the workpiece with helium at a specified pressure and concentration is typically encountered, and the mixing of helium with other gases requires specialized equipment and is done by the gas manufacturer. The mixed gas has higher single price than pure helium, so that in the practical process, a user has to use high-purity helium gas for detection. However, when the detected workpiece amount is large, the helium loss cost has to be considered, a helium-nitrogen mixing device with a simple design is lacked, special equipment is not needed for gas mixing, the raw material cost can be reduced, the helium concentration can be obtained according to a certain proportion by mixing according to requirements, and the helium loss and the side leakage use cost can also be reduced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a helium-nitrogen mixing device for helium leak detection.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a helium nitrogen mixing arrangement for helium leak hunting, includes helium source, nitrogen source, high-pressure tank, low-pressure tank and compressor at least, link to each other between nitrogen source and the low-pressure tank and form first branch road, helium source links to each other with the low-pressure tank and forms the second branch road, link to each other between low-pressure tank and the high-pressure tank and form the pumping pipeline, the high-pressure tank outwards extends and forms the detection pipeline, be equipped with the densimeter on the detection pipeline, high-pressure tank and low-pressure tank punishment do not are equipped with first manometer and second manometer, pumping pipeline department is located to the compressor, and the high-pressure tank passes through compressor extraction low-pressure tank gaseous medium, be equipped with first opening and closing valve and second opening and closing valve on first branch road and the second respectively, be equipped with the third opening and closing valve between compressor and the low-pressure tank, be equipped with the fourth opening and closing valve between densimeter and the detection pipeline.

The pumping pipeline end is equipped with the row and presses the pipeline, row presses pipeline department still to be equipped with nitrogen gas recovery unit and third manometer, it opens the valve to be equipped with the fifth between row presses pipeline and the pumping pipeline, nitrogen gas recovery unit is connected with the nitrogen gas source and is formed the recovery pipeline, be equipped with the sixth on-off valve on the recovery pipeline.

And positive pressure and negative pressure are respectively formed in the high-pressure tank and the low-pressure tank through the compressor.

Negative pressure is greater than or equal to 0.01Mpa in the low-pressure jar, malleation is greater than or equal to 2.98Mpa in the high-pressure jar, the pressure of pressure discharge pipeline department is 1.0 Mpa.

The first opening and closing valve, the second opening and closing valve, the third opening and closing valve, the fourth opening and closing valve and the fifth opening and closing valve are all electrically operated valves regulated and controlled by the PLC control system, and each electrically operated valve is provided with a normally-open manual valve in a matched mode.

The high-pressure tank is characterized by further comprising a rack for assembling all parts, and at least one safety valve is arranged on the high-pressure tank.

The utility model has the beneficial effects that: the helium-nitrogen mixing device for helium leak detection provided by the utility model is controlled by a PLC, has high automation degree, does not depend on manual operation, has less helium waste, greatly reduces the use cost, has simple principle and structure and is convenient for maintenance of personnel.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, a helium-nitrogen mixing device for helium leak detection at least comprises a helium source 1, a nitrogen source 2, a high-pressure tank 3, a low-pressure tank 4 and a compressor 5, wherein the high-pressure tank 3 and the low-pressure tank 4 respectively store high-pressure gas and low-pressure gas. The compressor 5 is used for delivering gas and forming a large pressure difference at two ends of the pipeline, and the pressure difference at two ends is kept within a certain range, otherwise, the self-starting is stable.

The nitrogen source 2 is connected with the low-pressure tank 4 to form a first branch, the helium source 1 is connected with the low-pressure tank 4 to form a second branch, a conveying channel for supplying nitrogen or helium is formed, and meanwhile, the first branch and the second branch can be combined into one at the conveying tail end, so that the design of interfaces of the low-pressure tank 4 is facilitated to be reduced, and the purity of conveying gas can be guaranteed.

The low-pressure tank 4 and the high-pressure tank 3 are connected to form a pumping pipeline, and positive pressure and negative pressure are respectively formed in the high-pressure tank 3 and the low-pressure tank 4 through the compressor 5. After the valve is opened, the negative pressure of the low-pressure tank 4 naturally absorbs gas, so that the gas in the helium gas source 1 or the nitrogen gas source 2 flows to the low-pressure tank 4.

The high-pressure tank 3 extends outwards to form a detection pipeline, and a concentration meter 6 is arranged on the detection pipeline. The concentration meter 6 on the detection pipeline monitors the concentration of the gas output by the high-pressure tank 3, and the gas can be naturally output outwards due to the positive pressure of the high-pressure tank 3. In a whole view, the compressor 5 integrates power, promotes the effect of gas input and output, and simplifies the structural design.

High- pressure tank 3 and 4 punishments of low-pressure tank do not are equipped with first manometer 7 and second manometer 8, compressor 5 is located and is taken out pipeline department, and high-pressure tank 3 extracts 4 interior gaseous medium of low-pressure tank through compressor 5, be equipped with first on-off valve 9 and second on-off valve 10 on first branch road and the second branch road respectively, be equipped with third on-off valve 11 between compressor 5 and the low-pressure tank 4, be equipped with fourth on-off valve 12 between concentration meter 6 and the detection pipeline. Each manometer is convenient for carry out inside atmospheric pressure monitoring, and each on-off valve carries out corresponding branch road flow direction control to and prevent that reverse flow from carrying out an effective shutoff, effectively protected the safe handling and the normal use of equipment. The automatic control system is characterized by further comprising a PLC control system, wherein the first opening and closing valve 9, the second opening and closing valve 10, the third opening and closing valve 11, the fourth opening and closing valve 12 and the fifth opening and closing valve 13 are all electric valves regulated and controlled by the PLC control system, and normally open manual valves are arranged at the positions of the electric valves in a matched mode. The electric valve facilitates automatic control of a circuit, and the manual valve is arranged to cut off gas in a local pipeline in case of emergency, local branch pipe dismounting and part dismounting. PLC is a mature technology product and tool and is not overly elaborated and limited herein.

The pumping pipeline end is equipped with the pressure discharge pipeline, pressure discharge pipeline department still is equipped with nitrogen gas recovery unit 14 and third manometer 15, be equipped with fifth opening and closing valve 13 between pressure discharge pipeline and the pumping pipeline, nitrogen gas recovery unit 14 is connected with nitrogen gas source 2 and is formed the recovery pipeline, be equipped with sixth opening and closing valve 16 on the recovery pipeline. The high-pressure discharge is carried out through the pressure discharge pipeline, and the requirement can not be met after the gas is mostly proportioned for many times, so that the gas is discharged and recovered, the pressure is reduced, and the gas is convenient to enter gas for supplement and readjust the concentration. The nitrogen recovery device 14 is various in the market, and can be simply distinguished by the physical characteristics of the two, and is determined by actual design and production.

Negative pressure is more than or equal to 0.01Mpa in the low-pressure jar 4, malleation is more than or equal to 2.98Mpa in the high-pressure jar 3, pressure of pressure discharge pipeline department is 1.0 Mpa. Under the pressure condition, the pressure regulator has small load on equipment and high operation efficiency, is favorable for reducing cost, ensures the long-term stable operation of the equipment and reduces the failure rate.

The high-pressure tank is characterized by further comprising a rack for assembling all parts, at least one safety valve is arranged on the high-pressure tank 3, the rack is convenient for installation and movement of the whole machine, and the safety valve is arranged to prevent over-high pressure in the tank caused by instrument faults. Because the safer gas is used, only one safety valve can be designed under general conditions, for example, the high-pressure tank 3 is internally provided with a safety valve with higher pressure and two safety valves with different take-off pressures need to be designed in pairs, so that the stable and safe use of the equipment is ensured.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, are not to be considered as limiting the present invention, and that the fundamental principles, the main features, and the advantages of the present invention are shown and described above, as would be understood by those skilled in the art.

Claims (6)

1. A helium-nitrogen mixing device for helium leak detection is characterized by at least comprising a helium source, a nitrogen source, a high-pressure tank, a low-pressure tank and a compressor, the nitrogen source is connected with the low-pressure tank to form a first branch, the helium source is connected with the low-pressure tank to form a second branch, the low pressure tank and the high pressure tank are connected to form a pumping pipeline, the high pressure tank extends outwards to form a detection pipeline, the detection pipeline is provided with a concentration meter, the high-pressure tank and the low-pressure tank are respectively provided with a first pressure gauge and a second pressure gauge, the compressor is arranged at the pumping pipeline, and the high-pressure tank pumps the gas medium in the low-pressure tank through the compressor, a first opening and closing valve and a second opening and closing valve are respectively arranged on the first branch and the second branch, and a third opening and closing valve is arranged between the compressor and the low-pressure tank, and a fourth opening and closing valve is arranged between the concentration meter and the detection pipeline.

2. The helium and nitrogen mixing device for helium leak detection according to claim 1, wherein a pressure discharge pipeline is arranged at the tail end of the pumping pipeline, a nitrogen recovery device and a third pressure gauge are further arranged at the pressure discharge pipeline, a fifth opening and closing valve is arranged between the pressure discharge pipeline and the pumping pipeline, the nitrogen recovery device is connected with a nitrogen source to form a recovery pipeline, and a sixth opening and closing valve is arranged on the recovery pipeline.

3. A helium-nitrogen mixing apparatus for helium leak detection as claimed in claim 2, wherein said high pressure tank and said low pressure tank are respectively provided with positive pressure and negative pressure by means of a compressor.

4. A helium and nitrogen mixing apparatus for helium leak detection as claimed in claim 3, wherein the negative pressure in said low pressure tank is greater than or equal to 0.01Mpa, the positive pressure in said high pressure tank is greater than or equal to 2.98Mpa, and the pressure at said pressure discharge line is 1.0 Mpa.

5. The helium and nitrogen mixing device for helium leak detection according to claim 1, further comprising a PLC control system, wherein the first, second, third, fourth and fifth opening and closing valves are all electrically operated valves controlled by the PLC control system, and each electrically operated valve is provided with a normally open manual valve.

6. A helium-nitrogen mixing device for helium leak detection as claimed in claim 1,

the high-pressure tank is characterized by further comprising a rack for assembling all parts, and at least one safety valve is arranged on the high-pressure tank.

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