CN213985559U

CN213985559U - Helium leak detection sniffing probe structure of heat exchanger

Info

Publication number: CN213985559U
Application number: CN202021208612.7U
Authority: CN
Inventors: 赵玄; 赵伟; 余可; 周小龙
Original assignee: China Nuclear Power Operation Technology Corp Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-08-17
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a helium leak detection sniffing probe structure of a heat exchanger, which comprises an air suction joint, a sintering block seat, an air suction joint, a gun head sleeve, a sealing ring, a leak hole joint, a connecting plate, a connecting pin, a HALF joint, a pagoda block, a gasket, a locking nut, a small gasket, a fastening block, a tube plate, a gland nut, a welding seam tube plate, an air pipe, a quick plug, a gun head, a sintering block, an O-shaped sealing ring, a heat transfer pipe, an inner sealing ring, a standard leak hole, a plastic connecting pipe, a thin steel wire cylinder, a screw and a temperature probe; the heat transfer pipe is arranged on one side of the pipe plate and fixed on an HALF joint, the HALF joint is connected with a leak hole joint, an inner sealing ring is arranged between the HALF joint and the leak hole joint, and a standard leak hole is arranged on the leak hole joint. The advantages are that: the detection sensitivity is improved; double sealing is increased, the sealing performance of the suction gun is enhanced, and the sensitivity is improved; the positioning accuracy of the leakage hole is improved through the needle head type design, and the inspection efficiency is certainly improved.

Description

Helium leak detection sniffing probe structure of heat exchanger

Technical Field

The utility model belongs to leak testing device, concretely relates to heat exchanger's helium leak hunting sniffing probe structure.

Background

In the presence of a large number of heat exchangers in fission nuclear power plants, with waste heat rejection heat exchangers, steam generators, condensers, these pressure vessels contain different numbers and sizes of heat transfer tubes depending on the function. After the heat exchangers are connected into a system, the heat exchangers enter a service period, during the service life, the interior of a heat transfer pipe runs in a high-temperature and high-pressure fluid environment, even a high-radiation environment, and damage defects such as leakage and the like can be generated, the performance of the heat exchangers can be seriously influenced by the penetration defects, the functions of the heat exchangers are reduced, and if the heat exchangers are arranged in a primary circuit or a heat exchanger of a high-radioactivity system, radioactive coolant can be leaked to other systems or loops, so that radioactive substances are leaked, and serious nuclear safety accidents are caused.

The heat transfer pipe of general heat exchanger is coated with liquid, the allowable leakage is to meet the lowest cut-off leakage rate, and to ensure that the molecules of liquid component do not pass through the leakage hole, so that the high leakage precision is required, even 10 is required^-9Pam³The leakage requirement of the helium leakage detecting system can reach 10 under a vacuum method^-9Pam³The requirement of/s is that if the object to be tested is a heat exchanger of a large container, the container reaches more than 50L, and the vacuum is difficult to reach 10^-2Pa, if the degree of vacuum is less than 10^-2Pa, the detection sensitivity of the system can not reach 10^-9Pam³And s. In other field engineering environments, typical vessels do not meet the high vacuum requirements. Only another helium leak detection method, namely a sniffing probe inspection method, which is abbreviated as a suction gun method, can be adopted, and the general suction gun method can only reach 10^-6Pam³S of not more than 10^-9Pam³In terms of/s. Conditions for the execution of the suction gun methodThe sensitivity is restricted, and the inlet pressure of the suction gun interface of the suction gun method is about 1pis, so that the high vacuum degree cannot be achieved.

According to the past literature and experience, if the vacuum degree of the mouth of the suction gun is improved, the internal structure can reach 10 under the optimization^-9Pam³High sensitivity in/s. The suction gun of present mainstream adopts stainless steel, connects the hose of certain length, and inner structure is complicated, uses many times, can produce the jam, and sensitivity reduces scheduling problem, because of the structure is complicated, has the problem of later maintenance difficulty, has caused the unnecessary loss.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a helium leak detection sniffing probe structure of heat exchanger, it can improve sensitivity, increases maintainability.

The technical scheme of the utility model as follows: a helium leak detection sniffing probe structure of a heat exchanger comprises a suction joint, a sintering block seat, an air suction joint, a gun head sleeve, a sealing ring, a leak hole joint, a connecting plate, a connecting pin, an HALF joint, a pagoda block, a gasket, a locking nut, a small gasket, a fastening block, a tube plate, a compression nut, a welding seam tube plate, an air pipe, a quick plug, a suction gun head, a sintering block, an O-shaped sealing ring, a heat transfer pipe, an inner sealing ring, a standard leak hole, a plastic connecting pipe, a thin steel wire barrel, a screw and a temperature probe; the heat transfer pipe is arranged on one side of the pipe plate and fixed on an HALF joint, the HALF joint is connected with a leak hole joint, an inner sealing ring is arranged between the HALF joint and the leak hole joint, and a standard leak hole is arranged on the leak hole joint.

The heat transfer pipe passes through the tube plate, and the heat transfer pipe is fixed on the tube plate by the compression nut.

The heat transfer pipe passes through the sealing ring and the connecting plate, the sealing ring and the connecting plate are located below the tube plate, and the heat transfer pipe is connected with the gun head sleeve.

The gun head sleeve is connected with the air suction joint through a locking nut.

The air suction joint is connected with the thin steel wire cylinder, and the thin steel wire cylinder is connected with the air suction joint.

The air exhaust connector is connected with the quick plug, the quick plug is connected with the air pipe, and the air pipe is connected with the temperature probe.

The heat transfer pipe pass the tube sheet, be equipped with O type sealing washer and little gasket between heat transfer pipe and the tube sheet, the overhead precious tower piece that is connected with of suction gun, precious tower piece and sintering block seat are connected, install fritting 23 on the sintering block seat, be equipped with O type sealing washer between sintering block seat and the fritting, the fritting is connected and is inhaled the rifle head, connects the suction gun head and connect the plastic connecting pipe.

And a gasket is arranged between the pagoda block and the sintering block seat.

The needle-shaped thin tube is fixed through an adjusting nut and is respectively connected with the temperature probe and the air tube.

The beneficial effects of the utility model reside in that: the detection sensitivity is improved; the quick plug-in connection is convenient to replace and maintain; double sealing is increased, the sealing performance of the suction gun is enhanced, and the sensitivity is improved; the positioning accuracy of the leakage hole is improved through the needle head type design, and the inspection efficiency is certainly improved.

Drawings

Fig. 1 is a schematic structural view of a helium leak detection sniffing probe of a heat exchanger provided by the present invention;

FIG. 2 is a side view of FIG. 1;

fig. 3 is a schematic external view of a sniffing probe.

In the figure, 1 a suction joint, 2 a sintering block seat, 3 a suction joint, 4 a gun head sleeve, 5 a sealing ring, 6 a leak hole joint, 7 a connecting plate, 8 a connecting pin, 9 an HALF joint, 10 pagoda blocks, 11 gaskets, 12 a first supporting leg, 13 a second supporting leg, 14 a locking nut, 15 small gaskets, 16 a fastening block, 17 a pipe plate, 18 a compression nut, 19 a welding seam pipe plate, 20 a gas pipe, 21 a quick plug, 22 a suction gun head, 23 a sintering block, 24O-shaped sealing rings, 25 heat transfer pipes, 26 inner sealing rings, 27 standard leak holes, 28 plastic connecting pipes, 29 thin steel wire cylinders, 30 screws, 31 temperature probes, 32 adjusting nuts and 33 needle-shaped thin pipes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A helium leak detection sniffing probe structure of a heat exchanger comprises an air suction joint 1, a sintering block seat 2, an air suction joint 3, a gun head sleeve 4, a sealing ring 5, a leak hole joint 6, a connecting plate 7, a connecting pin 8, an HALF joint 9, a pagoda block 10, a gasket 11, a first supporting leg 12, a second supporting leg 13, a locking nut 14, a small gasket 15, a fastening block 16, a tube plate 17, a compression nut 18, a welding seam tube plate 19, an air tube 20, a quick plug 21, a suction gun head 22, a sintering block 23, an O-shaped sealing ring 24, a heat transfer tube 25, an inner sealing ring 26, a standard leak hole 27, a plastic connecting tube 28, a thin steel wire cylinder 29, a screw 30 and a temperature probe 31.

As shown in fig. 1, a welding seam pipe plate 19 is installed on the upper part of the pipe plate 17, a heat transfer pipe 25 is installed on one side of the pipe plate 17, the heat transfer pipe 25 is fixed on an HALF joint 9, the HALF joint 9 is connected with a leak hole joint 6, an inner sealing ring 26 is arranged between the HALF joint 9 and the leak hole joint 6, and a standard leak hole 27 is arranged on the leak hole joint 6;

the heat transfer pipe 25 passes through the tube plate 17, the heat transfer pipe 25 is fixed on the tube plate 17 by the compression nut 18, the heat transfer pipe 25 passes through the sealing ring and the 5 connecting plate 7, the sealing ring and the 5 connecting plate 7 are located below the tube plate 17, the heat transfer pipe 25 is connected with the gun head sleeve 4, the gun head sleeve 4 is connected with the air suction connector 1 through the locking nut 14, the air suction connector 1 is connected with the thin steel wire cylinder 29, the thin steel wire cylinder 29 is connected with the air suction connector 3, the air suction connector 3 is connected with the quick plug 21, the quick plug 21 is connected with the air pipe 20, and the air pipe 20 is connected with the temperature probe 31.

As shown in fig. 2, a heat transfer pipe 25 passes through a pipe plate 17, an O-shaped sealing ring 24 and a small gasket 15 are arranged between the heat transfer pipe 25 and the pipe plate 17, a pagoda block 10 is connected to a suction gun head 22, the pagoda block 10 is connected to a sintering block seat 2, a gasket 11 is arranged between the pagoda block 10 and the sintering block seat 2, a sintering block 23 is arranged on the sintering block seat 2, the O-shaped sealing ring 24 is arranged between the sintering block seat 2 and the sintering block 23, the sintering block 23 is connected with the suction gun head 22, and the connection suction gun head 22 is connected with a plastic connecting pipe 28.

As shown in fig. 3, the needle-like narrow tube 33 is fixed by the adjusting nut 32, and the temperature probe 31 and the gas tube 20 are connected to the needle-like narrow tube 33, respectively.

The utility model discloses a use as follows:

firstly, inserting the temperature probe 31 and the air pipe 20 onto the air extraction joint 3, and forcibly pulling out the temperature probe 31 and the air pipe 20 to ensure that the temperature probe 31 and the air pipe 20 cannot be pulled out; the adjusting nut 32 and the needle-like narrow tube 33 inside are combined into the suction fitting 1, and the O-ring 24, the inner seal 26, the pagoda block 10, the small spacer 15, and the lock nut 14 are all fixed at the upper positions thereof.

The HALF joint 9, the fastening block 16 and the compression nut 18 are fixed on the welded seam tube plate 19 and the tube plate 17 from the outside, and then the quick plug 21, the suction gun head 22, the sintered block 23, the heat transfer tube 25, the standard leak hole 27, the plastic connecting tube 28, the thin steel wire cylinder 29 and the screw 30 are respectively fixed.

Claims

1. The utility model provides a helium leak hunting sniffing probe structure of heat exchanger which characterized in that: the device comprises an air suction joint, a sintering block seat, an air suction joint, a gun head sleeve, a sealing ring, a leak hole joint, a connecting plate, a connecting pin, an HALF joint, a pagoda block, a gasket, a locking nut, a small gasket, a fastening block, a tube plate, a compression nut, a welding seam tube plate, an air tube, a quick plug, an air suction gun head, a sintering block, an O-shaped sealing ring, a heat transfer tube, an inner sealing ring, a standard leak hole, a plastic connecting tube, a thin steel wire barrel, a screw and a temperature probe; the heat transfer pipe is arranged on one side of the pipe plate and fixed on an HALF joint, the HALF joint is connected with a leak hole joint, an inner sealing ring is arranged between the HALF joint and the leak hole joint, and a standard leak hole is arranged on the leak hole joint.

2. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the heat transfer pipe passes through the tube plate, and the heat transfer pipe is fixed on the tube plate by the compression nut.

3. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the heat transfer pipe passes through the sealing ring and the connecting plate, the sealing ring and the connecting plate are located below the tube plate, and the heat transfer pipe is connected with the gun head sleeve.

4. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the gun head sleeve is connected with the air suction joint through a locking nut.

5. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the air suction joint is connected with the thin steel wire cylinder, and the thin steel wire cylinder is connected with the air suction joint.

6. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the air exhaust connector is connected with the quick plug, the quick plug is connected with the air pipe, and the air pipe is connected with the temperature probe.

7. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 1, characterized in that: the heat transfer pipe pass the tube sheet, be equipped with O type sealing washer and little gasket between heat transfer pipe and the tube sheet, the overhead precious tower piece that is connected with of suction gun, precious tower piece and sintering block seat are connected, install fritting (23) on the sintering block seat, be equipped with O type sealing washer between sintering block seat and the fritting, the fritting is connected and is inhaled the rifle head, connect and inhale the rifle head and connect the plastics connecting pipe.

8. A helium leak detection sniffing probe configuration for heat exchangers as claimed in claim 7, characterized in that: and a gasket is arranged between the pagoda block and the sintering block seat.