CN210603768U - Helium mass spectrometer leak detection device for butt weld of pipe and tube - Google Patents
Helium mass spectrometer leak detection device for butt weld of pipe and tube Download PDFInfo
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- CN210603768U CN210603768U CN201921767540.7U CN201921767540U CN210603768U CN 210603768 U CN210603768 U CN 210603768U CN 201921767540 U CN201921767540 U CN 201921767540U CN 210603768 U CN210603768 U CN 210603768U
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Abstract
The utility model discloses a pipe butt weld helium mass spectrum leak hunting device, including box (1), box joint (5) and helium mass spectrum detector be provided with through-hole (101) on box (1), box joint (5) set up on box (1) to connect helium mass spectrum detector, box joint (5) have the through-hole for helium mass spectrum detector and box (1) inner space looks UNICOM. The utility model discloses a pipe butt weld helium mass spectrum leak hunting device has and does not destroy tubular product and welding seam, leak hunting efficient, with low costs, make easily, the reliability is high, can confirm a great deal of advantages such as leak source position.
Description
Technical Field
The utility model relates to a device of pipe butt weld helium mass spectrum leak hunting, in particular to device of nuclear island heat exchanger heat-transfer pipe butt weld helium mass spectrum leak hunting belongs to detection area.
Background
In the field of nuclear power equipment manufacturing, a heat transfer pipe of a heat exchanger is a barrier between a primary side radioactive medium and a secondary side, and once leakage occurs, the secondary side is polluted greatly. The tube-to-tube butt welds of heat transfer tubes also have the above-mentioned risk of leakage, and therefore, the sealability requirements on the tube-to-tube butt welds are high.
At present, the tightness detection of the butt weld of the pipe is generally performed by adopting a water pressure/air pressure test, but the efficiency is low, the cost is high, and the treatment is complex.
Helium mass spectrometer leak detection is an economic and convenient detection method, if the method can be applied to detection of heat transfer tubes of heat exchangers, the detection cost can be greatly reduced, but the method is limited by the functionality of a helium mass spectrometer leak detection device, the method cannot be applied to tube-to-tube butt welding leak detection at present, particularly to tube-to-tube butt welding seams of heat transfer tubes of nuclear islands heat exchangers, and firstly, sealing (the vacuum degree is not higher than 5pa) and vacuumizing at the outer sides of the tube-to-tube butt welding seams are difficult to realize; and secondly, gaps among pipelines of heat transfer pipe parts of the nuclear island heat exchanger are narrow, and a helium mass spectrometer leak detector is used in insufficient space.
Therefore, research and design of a helium mass spectrometer leak detection device which can be applied to leak detection of a butt weld of a heat transfer pipe and a pipe of a nuclear island heat exchanger are urgently needed in the prior art.
Because of the above reasons, the utility model discloses the people have made intensive research to design a pipe butt weld helium mass spectrum leak hunting device.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model develops a helium mass spectrometer leak detection device for the butt weld of the pipe and the tube, which comprises a box body 1, a box body joint 5 and a helium mass spectrometer,
the utility model discloses in, it is right helium mass spectrometer does not have special requirement, and any known helium mass spectrometer all can
The box body 1 is provided with a through hole 101, so that the box body 1 can be covered on the welding line of the outer wall of the pipe to be measured,
the diameter of the through hole 101 is the same as or slightly smaller than the outer diameter of the pipe to be tested, the difference between the diameter of the through hole 101 and the outer diameter of the pipe to be tested is 0-3 mm, preferably, the difference between the outer diameter of the pipe to be tested and the diameter of the through hole 101 is 0.5-2 mm,
the interior of the box body 1 is of a hollow structure, so that a certain gap is formed between the interior of the box body 1 and the outer wall of the pipe to be measured,
in a preferred embodiment, the case 1 includes a lower case 103 and an upper case 102 detachably installed,
more preferably, at the connecting position of the lower box 103 and the upper box 102, and at the position of the box 1 contacting with the pipe to be measured, there are also provided gaskets 3, the gaskets 3 are made of elastic material, preferably rubber,
according to the helium mass spectrometer leak detection device for the pipe butt weld provided by the utility model, the device can also be provided with a box body clamping piece 2 which is used for fixedly clamping the lower box body 103 and the upper box body 102 to form a complete box body and can be sealed,
the box body clamping piece 2 can be any clamping and fixing device as long as the lower box body 103 and the upper box body 102 can be fastened,
in a preferred embodiment, the case holder 2 is a thumb screw, and has a fixing bracket 104 at a position corresponding to the upper case 102 and the lower case 103, respectively, a screw hole is provided on the fixing bracket 104,
furthermore, the fixing frame 104 has a plurality of fixing frames, which are uniformly distributed around the box body 1,
in another preferred embodiment, the box clamping member 2 is a C-shaped clamp having a clamping frame 21 and a clamping bolt 22, as shown in fig. 7, the clamping frame 21 is C-shaped in cross section, a threaded hole is provided at one end of the clamping frame 21 for receiving the clamping bolt 22, the upper box 102 and the lower box 103 are placed in the middle of the clamping frame 21, the clamping bolt 22 is screwed to tightly join the upper box 102 and the lower box 103 together,
more preferably, a protrusion 211 is further provided at the other end of the clamping frame 21.
A box body joint 5 is also arranged at one side of the box body 1, the box body joint 5 is used for connecting the helium mass spectrometer, the box body joint 5 is provided with a through hole so as to lead the helium mass spectrometer to be communicated with the inner space of the box body 1,
in a preferred embodiment, the tank connector 5 is detachably mounted on the tank 1,
furthermore, an interface hole 105 is arranged on the box body 1, the interface hole 105 is internally provided with internal threads,
a screw 51 corresponding to the internal thread of the interface hole 105 is arranged at one end of the box joint 5,
further, a sealing gasket 4 is arranged between the screw 51 and the interface hole 105,
preferably, a wrench position 52 is arranged on the screw 51, the wrench position 52 is used for matching with an open wrench, so as to facilitate the box joint 5 to be screwed,
the other end of the box body joint 5 is provided with a structure which is the same as a standard vacuum flange interface, so that the box body joint 5 can be connected with a helium mass spectrometer or a vacuum pipe fitting,
the other end of the box body joint 5 is provided with a structure which is the same as the standard vacuum flange interface, such as a structure which is the same as a CF flange or a KF flange,
in a preferred embodiment, the helium mass spectrometer leak detection device for the pipe-pipe butt weld further comprises a vacuum extension pipe 6, two ends of the vacuum extension pipe 6 are vacuum interfaces, the box body joint 5 is connected with a helium mass spectrometer when the space around the pipe to be detected is narrow,
according to the utility model discloses, utilize above-mentioned pipe butt weld helium mass spectrum leak hunting device, can seal pipe butt weld department, and then use the helium mass spectrum to leak hunting, leak hunting including the method of following step:
s1, selecting a helium mass spectrum leak detection device of the pipe butt weld matched with the outer diameter of the pipe to be detected, and placing the butt weld to be detected in the box body 1;
s2, connecting a box body joint 5 of the device with a helium mass spectrometer;
s3, opening the helium mass spectrometer, and vacuumizing;
and S4, filling helium into the pipeline of the tube to be detected, and observing the response condition of the helium mass spectrometer.
In a preferred embodiment, in order to improve the detection sensitivity of the device, the pipeline of the tube to be detected is vacuumized, then helium is sprayed,
one end of the pipeline to be tested is sealed, the other end is connected with a three-way valve 8 through a threaded sleeve 7,
the three-way valve 8 is provided with a valve which can control the opening and closing of the pipeline on the three-way valve,
the first end of the three-way valve 8 is connected with the pipeline to be tested, the second end is connected with the barometer 9, the third end is a movable connecting end 10, the movable connecting end 10 is of a standard vacuum interface structure and can be connected with a vacuum pump, a channel corresponding to the movable connecting end 10 is opened through a valve, the pipeline to be tested is vacuumized,
after the vacuum pumping is finished, the movable connecting end 10 is connected with helium filling equipment, and helium is filled into the pipeline to be tested.
In a more preferred embodiment, a helium gas filling pipe 11 is further provided at one end of the pipe to be tested,
one end of the helium gas filling pipe 11 is connected with the pipeline to be tested through a threaded sleeve 111, the other end is a standard vacuum interface to be connected with helium filling equipment, a pipeline valve 112 is further arranged on the helium gas filling pipe 11,
when the pipeline to be tested is vacuumized, the pipeline valve 112 is closed, after the vacuumizing is finished, the pipeline valve 112 is opened, and helium gas is filled into the pipeline.
The utility model provides a pipe butt weld helium mass spectrum leak hunting device can gain following beneficial effect:
(1) according to the helium mass spectrometer leak detection device for the tubular product, the tubular product and the welding line are not damaged, the leak detection efficiency is high, and the cost is low;
(2) the helium mass spectrometer leak detection device for the tubular product, provided by the utility model, is easy to manufacture, good in vacuum tightness and high in reliability;
(3) according to the helium mass spectrometer leak detection device for the tubular product, the operation is simple, the leak detection can be rapidly and accurately carried out on the tubular product, the detection precision is high, and the position of a leak point can be determined;
(4) according to the utility model provides a tubular product helium mass spectrum leak hunting device, repeatedly usable, energy-concerving and environment-protective.
Drawings
FIG. 1 is a schematic structural diagram of a helium mass spectrometer leak detection device for a pipe-pipe butt weld according to a preferred embodiment of the invention;
FIG. 2 is a schematic structural diagram of a box body of a helium mass spectrometer leak detection device for a pipe-pipe butt weld according to a preferred embodiment of the invention;
FIG. 3 shows a cross-sectional view A-A of the box structure of FIG. 2;
FIG. 4 is a schematic structural diagram of a box body of a helium mass spectrometer leak detection device for a pipe-to-pipe butt weld according to a preferred embodiment of the invention;
FIG. 5 is a schematic structural diagram of a box body of a helium mass spectrometer leak detection device for a pipe-to-pipe butt weld according to a preferred embodiment of the invention;
FIG. 6 is a schematic structural diagram of a box body and a box body clamping piece of the helium mass spectrometer leak detection device for the butt weld of the pipe and the pipe according to a preferred embodiment of the invention;
FIG. 7 is a schematic diagram of a box clamp of a helium mass spectrometer leak detection device for a butt weld of a tube according to a preferred embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a box body of a helium mass spectrometer leak detection device for a pipe-to-pipe butt weld according to a preferred embodiment of the invention;
FIG. 9 is a schematic structural view of a helium mass spectrometer leak detection device for pipes according to a preferred embodiment of the present invention;
figure 10 shows a schematic view of a mandrel construction according to a preferred embodiment of the present invention;
fig. 11 shows a schematic view of a vacuum fitting structure according to a preferred embodiment of the present invention;
fig. 12 shows a schematic structural diagram of a helium mass spectrometer leak detection device for pipes according to a preferred embodiment of the invention.
The reference numbers illustrate:
1-a box body;
101-a through hole;
102-upper box body;
103-lower box body;
104-a fixing frame;
105-an interface aperture;
2-box body clamping piece;
21-a clamping frame;
22-a clamping bolt;
211-protrusions;
3-a sealing gasket;
4-a sealing gasket;
5-box body joint;
51-screw rod;
52-spanner position;
6-vacuum extension tube;
7-a thread bushing;
8-three-way valve;
9-barometer;
10-a movable connection end;
11-helium gas filling tube;
111-thread bush;
112-a pipeline valve;
201-vacuum connection;
2011-internal thread segment;
202-a mandrel;
2021-upper external thread;
2022-lower external thread;
2023-round tube section;
203-a hold down;
204-a washer;
205-a gasket;
2051-oil absorbent cotton;
206-a support;
207-circular washer;
208-locknut.
Detailed Description
The invention is explained in more detail below with reference to the drawings and preferred embodiments. The features and advantages of the present invention will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
According to the utility model, a helium mass spectrometer leak detection device for a pipe butt weld is provided, which comprises a box body 1, a box body joint 5 and a helium mass spectrometer, as shown in figure 1,
in the utility model, no special requirements are required for the helium mass spectrometer, any known helium mass spectrometer can be used, such as HELIOT301, inficon UL1000, phoeniX L300 and other types of helium mass spectrometers in Eimeria,
the box body 1 is a structure capable of covering a welding seam on the outer wall of a pipe to be tested, the box body 1 with different sizes can be manufactured according to pipes with different specifications, as shown in figure 2, a through hole 101 is formed in the box body, so that the pipe to be tested can pass through the through hole 101, furthermore, the diameter of the through hole 101 is the same as or slightly smaller than the outer diameter of the pipe to be tested, the difference between the diameter of the through hole 101 and the outer diameter of the pipe to be tested is 0-3 mm, preferably, the difference between the outer diameter of the pipe to be tested and the diameter of the through hole 101 is 0.5-2 mm, so that after the box body 1 is connected with the pipe to be tested, the box body 1 can be slightly deformed, further, the contact between the box body 1 and the,
the interior of the box body 1 is a hollow structure, as shown in fig. 3, so that a certain gap is formed between the interior of the box body 1 and the outer wall of the pipe to be measured, and a vacuum environment can be formed between the interior of the box body 1 and the outer wall of the pipe to be measured,
in a preferred embodiment, the box 1 comprises a lower box 103 and an upper box 102, which are detachably mounted, as shown in fig. 4, so that the box 1 is more conveniently mounted in contact with the pipe to be tested,
more preferably, sealing gaskets 3 are further arranged at the connecting position of the lower box 103 and the upper box 102 and the contact position of the box 1 and the pipe to be tested, and the sealing gaskets 3 are made of elastic materials and are preferably made of rubber, so that the lower box 103 and the upper box 102 can be better sealed after the box 1 is combined with the pipe to be tested.
According to the helium mass spectrometer leak detection device for the pipe butt weld provided by the utility model, the device can also be provided with a box body clamping piece 2 which is used for fixedly clamping the lower box body 103 and the upper box body 102 to form a complete box body and can be sealed,
the box body clamping piece 2 can be any clamping and fixing device as long as the lower box body 103 and the upper box body 102 can be fastened,
in a preferred embodiment, the case holder 2 is a thumb screw, and has a fixing frame 104 at a corresponding position of the upper case 102 and the lower case 103, as shown in fig. 6, a screw hole is provided on the fixing frame 104, the purpose of fastening the lower case 103 and the upper case 102 is achieved by screwing the thumb screw,
furthermore, the fixing frame 104 has a plurality of fixing frames, which are uniformly distributed around the box body 1,
in another preferred embodiment, the box clamping member 2 is a C-shaped clamp having a clamping frame 21 and a clamping bolt 22, as shown in fig. 7, the clamping frame 21 is C-shaped in cross section, a threaded hole is provided at one end of the clamping frame 21 for receiving the clamping bolt 22, the upper box 102 and the lower box 103 are placed in the middle of the clamping frame 21, the clamping bolt 22 is screwed to tightly join the upper box 102 and the lower box 103 together,
more preferably, a protrusion 211 is further disposed at the other end of the clamping frame 21 to better fix the box body 1.
A box body joint 5 is also arranged at one side of the box body 1, the box body joint 5 is used for connecting the helium mass spectrometer, the box body joint 5 is provided with a through hole so as to lead the helium mass spectrometer to be communicated with the inner space of the box body 1,
in a preferred embodiment, the box connector 5 is detachably arranged on the box body 1, so that the box connector 5 can be replaced according to different types of selected helium mass spectrometer interfaces, the same box connector 5 can be used on box bodies 1 with different sizes,
further, an interface hole 105 is provided on the case 1, as shown in fig. 8, the interface hole 105 has an internal thread therein,
one end of the box body joint 5 is provided with a screw rod 51 corresponding to the internal thread of the interface hole 105, so that the box body joint 5 can be connected on the box body 1,
further, a gasket 4 is provided between the screw 51 and the interface hole 105, to improve the airtightness between the tank joint 5 and the tank 1,
preferably, a wrench position 52 is arranged on the screw 51, the wrench position 52 is used for matching with an open wrench to facilitate the box body joint 5 to be screwed and further connected with the box body 1 in a threaded manner,
at the other end of the box connector 5, a structure the same as that of a standard vacuum flange interface, such as a structure the same as that of a CF flange and a KF flange, is provided, so that the box connector 5 can be connected with a helium mass spectrometer or a vacuum pipe fitting.
In a preferred embodiment, the helium mass spectrometer leak detection device for the pipe-pipe butt weld further comprises a vacuum extension pipe 6, the vacuum extension pipe 6 is a pipe with vacuum ports at two ends, the box body joint 5 is connected with a helium mass spectrometer when the space around the pipe to be detected is narrow,
according to the utility model discloses, utilize above-mentioned pipe butt weld helium mass spectrum leak hunting device, can seal pipe butt weld department, and then use the helium mass spectrum to leak hunting, leak hunting including the method of following step:
s1, selecting a helium mass spectrum leak detection device of the pipe butt weld matched with the outer diameter of the pipe to be detected, and placing the butt weld to be detected in the box body 1;
s2, connecting a box body joint 5 of the device with a helium mass spectrometer;
s3, opening the helium mass spectrometer, and vacuumizing;
and S4, filling helium into the pipeline of the tube to be detected, and observing the response condition of the helium mass spectrometer.
Preferably, in S1, the method further comprises the following steps:
s101, disassembling the box body 1 into an upper box body 102 and a lower box body 103 so as to place a butt weld to be tested in the internal space of the box body 1;
s102, clamping and fixing the upper box body 102 and the lower box body 103 by using a box body clamping piece 2, so that the box body 1 and the outer wall of the pipe to be detected are sealed;
in a more preferred embodiment, before step S101, there may be the step of:
s100, coating sealing oil on the contact position of the box body 1 and the pipe to be measured and the contact position of the upper box body 102 and the lower box body 103.
According to the present invention, in step S2, there may be preferably the following steps:
s201, sleeving a sealing gasket 4 at the screw 51 end of a box body joint 5, and screwing the box body joint 5 on a box body 1;
if the surrounding space of the pipe to be detected is narrow and small, the helium mass spectrometer cannot be placed, and the method can also comprise the following steps:
s202, the box body joint 5 is connected with one end of the vacuum extension tube 6, and then the other end of the vacuum extension tube 6 is connected with the helium mass spectrometer.
In a more preferred embodiment, in order to obtain better device airtightness, before the step S201, there may be further steps of:
and S200, coating sealing oil on two sides of the sealing gasket 4.
In step S3, when the vacuum degree is lower than 5pa, the vacuum pumping is stopped, and whether the vacuum degree value rises or not is observed, if the vacuum degree value continues rising, the air leakage phenomenon of the device is shown, and the connecting positions can be sealed by using vacuum mud.
In step S4, if the helium mass spectrometer does not respond, it indicates that the pipe to be tested has no leak point, if the helium mass spectrometer responds, it indicates that the pipe to be tested has a leak point, and the size of the leak point can be roughly determined according to the current size on the helium mass spectrometer,
in a preferred embodiment, in order to improve the detection sensitivity of the device, the pipeline of the tube to be detected is vacuumized, then helium is sprayed,
one end of a pipeline to be tested is sealed, the other end of the pipeline to be tested is connected with a three-way valve 8 through a threaded sleeve 7, as shown in figure 1, a valve is arranged on the three-way valve 8 and can control the opening and closing of a pipeline on the three-way valve, the first end of the three-way valve 8 is connected with the pipeline to be tested, the second end of the three-way valve 8 is connected with a barometer 9, the third end of the three-way valve is a movable connecting end 10, the movable connecting end 10 is of a standard vacuum interface structure and can be connected with a vacuum pump through a hoop, a channel corresponding to the movable connecting end 10 is opened through the valve, the pipeline to be tested can be vacuumized, and as the pipeline does not need high vacuum degree,
after the vacuum pumping is finished, the movable connecting end 10 is connected with helium filling equipment, and helium is filled into the pipeline to be tested.
In a more preferred embodiment, a helium gas filling pipe 11 is further provided at one end of the pipe to be tested,
one end of the helium gas filling pipe 11 is connected with the pipeline to be tested through a threaded sleeve 111, the other end is a standard vacuum interface to be connected with helium filling equipment, a pipeline valve 112 is further arranged on the helium gas filling pipe 11 to control the opening and closing of the pipeline,
when the pipeline to be tested is vacuumized, the pipeline valve 112 is closed, after the vacuumizing is finished, the pipeline valve 112 is opened, and helium gas is filled into the pipeline.
According to the present invention, in a preferred embodiment, in the step S4, the method may further include:
s401, sealing one end of a pipeline to be tested, sequentially connecting the other end of the pipeline to be tested with a threaded sleeve 7, a three-way valve 8 and a pressure gauge 9, and connecting a movable connecting end 10 of the three-way valve 8 with a vacuum pump;
s402, opening a pipeline corresponding to the movable connecting end 10 through a valve, vacuumizing the pipeline to be tested, observing the number of readings of the barometer 9, closing one end of the movable connecting end 10 by using the valve after the vacuumizing meets the requirement, and removing the vacuum pump;
and S403, connecting the movable connecting end 10 with helium filling equipment, opening the movable connecting end 10 through a valve, filling helium into the pipeline to be detected, and observing the indication number of the barometer 9 to avoid excessive filling of helium.
In a more preferred embodiment, the step S4 may further include:
s401, connecting one end of a pipeline to be tested with a helium filling pipe 11, and connecting the helium filling pipe 11 with helium filling equipment;
s402, sequentially connecting the other end of the pipeline to be tested with a threaded sleeve 7, a three-way valve 8 and a pressure gauge 9, wherein a movable connecting end 10 of the three-way valve 8 is connected with a vacuum pump;
s403, closing a pipeline valve 112 on the helium gas filling pipe 11, opening a pipeline corresponding to the movable connecting end 10 through the valve, vacuumizing the pipeline to be tested, observing the number of readings of the barometer 9, and closing one end of the movable connecting end 10 by using the valve after the vacuumizing meets the requirement;
s404, opening the pipeline valve 112, filling helium into the pipeline to be tested, and observing the indication number of the barometer 9 to avoid excessive helium filling.
According to pipe butt weld helium mass spectrum leak hunting device and leak hunting method, not only can detect whether pipe butt weld exists the leak source, can also be used for the accurate positioning to the leak source of tubular product itself.
Specifically, the following tube helium mass spectrometer leak detection device can be used for detecting the tube firstly and checking whether the tube has a leak source.
The device comprises a vacuum joint 201, a mandrel 202, a lower pressing piece 203, a sealing pad 205, a supporting piece 206 and a helium mass spectrometer,
The press-down member 203 is any one of members that can move axially along the mandrel 202, so that the seal 205 can expand radially along the mandrel 202 under the pressing action of the press-down member 203 and the support 206,
in a preferred embodiment, the upper part of the mandrel 202 is provided with an upper external thread 2021, as shown in fig. 10, the lower part is provided with a lower external thread 2022, a smooth round pipe section 2023 is arranged between the upper external thread 2021 and the lower external thread 2022,
preferably, the length of the circular tube section 2023 is 3-10 cm, the length of the circular tube section 2023 is too short, which easily causes poor air tightness between the mandrel 202 and the sealing gasket 205, the length of the circular tube section 2023 is too long, which easily causes insufficient deformation of the sealing gasket and poor air tightness due to the loose combination with the pipe to be tested,
further, the mandrel 202 is preferably made of stainless steel, so that the requirement on mechanical strength during vacuum pumping is met, and the machining is facilitated.
At the top end of the mandrel 202, a vacuum joint 201 is arranged, as shown in fig. 9, the vacuum joint 201 is coaxial with the mandrel 202, the lower end of the vacuum joint 201 is hermetically connected with the mandrel 202,
in a preferred embodiment, the vacuum connector 201 has an internal thread section 2011 corresponding to the upper external thread 2021 on the inner side of the lower end thereof, so that the vacuum connector 201 and the mandrel 202 can be connected by threads, and preferably, a raw material tape or a liquid sealant is arranged between the threads of the vacuum connector 201 and the mandrel 202, so that the vacuum connector 201 and the mandrel 202 can be sealed,
the utility model discloses the people discovery, at helium mass spectrum leak hunting in-process, because it is higher to require the vacuum, generally need the vacuum below 5pa, sealed not tight phenomenon appears very easily in general thread seal, and then leads to detecting failure the utility model discloses in, vacuum joint 201's lower extreme and dabber 202 contact position adopt the welded mode to carry out secondary seal and fixed to stop the possibility of gas leakage between vacuum joint 201 and the dabber 202, increase the stability of device.
The vacuum joint 201 is preferably made of stainless steel so as to facilitate welding, the upper end of the vacuum joint 201 is used for connecting a helium mass spectrometer and is a portable joint design capable of quickly connecting a standard vacuum pipeline on the helium mass spectrometer, the joint is matched with a standard joint on the helium mass spectrometer, in the utility model, the upper end of the vacuum joint 201 is preferably a joint with the same style as the standard vacuum joint, such as a structure with the same standard joint of KF16, as shown in FIG. 11, so that the pipe helium mass spectrometer leak detection device can be quickly connected with the helium mass spectrometer,
a lower pressing member 203 is further sleeved on the upper external thread 2021, as shown in fig. 9, the lower pressing member 203 has an internal thread corresponding to the upper external thread 2021, and is preferably a wing nut, so that the lower pressing member 203 can be screwed on the upper external thread 2021 and move axially along the core shaft 202 to press the sealing gasket 205.
The sealing gasket 205 is a tubular sealing ring, has elasticity, is preferably made of rubber, the inner diameter of the sealing gasket 205 is the same as the outer diameter of the circular tube section 2023, the difference between the inner diameter of the tube to be detected and the outer diameter of the sealing gasket 205 is less than 2mm, so that the sealing gasket 205 can expand radially after being extruded to fill the gap between the sealing gasket and the tube to be detected, thereby playing a role in sealing,
in a preferred embodiment, the length of the gasket 205 is the same as the length of the round tube section 2023, so that the gasket 205 is more easily compressed.
In a preferred embodiment, there are two gaskets 205, as shown in fig. 12, the sum of the lengths of the two gaskets 205 is the same as that of the circular tube section 2023, an oil absorption cotton 2051 is disposed between the two gaskets 205, the oil absorption cotton 2051 is in an annular design, the inner diameter of the oil absorption cotton 2051 is the same as the outer diameter of the circular tube section 2023, and the outer diameter of the oil absorption cotton is the same as the inner diameter of the tube to be tested, the oil absorption cotton 2051 is soaked in the sealing oil in advance, and when the gasket 205 is squeezed, the oil absorption cotton 2051 is squeezed along with the oil absorption cotton, so that the sealing oil in the oil absorption cotton 2051 can be squeezed out and infiltrate into the.
The supporting member 206 is used for supporting the sealing gasket 205, as shown in fig. 9, so that the sealing gasket 205 can be pressed in the process of screwing down the pressing member 203, preferably, the diameter of the outer circle of the end surface of the supporting member 206 is 70% -95% of the inner diameter of the pipe to be detected, so that the supporting member 206 has a larger supporting area, and further can better support the sealing gasket 205,
more preferably, a circular gasket 207 is further disposed between the supporting member 206 and the sealing pad 205, as shown in fig. 12, the circular gasket 207 has a cross section with the same size and shape as the cross section of the sealing pad 205, so as to better support the sealing pad 205,
in the utility model, a gasket 204 is arranged between the lower pressing piece 203 and the sealing gasket 205, the cross section of the gasket 204 is the same as the cross section of the sealing gasket 205 in size and shape, so that the lower pressing piece 203 can more uniformly extrude the sealing gasket 205, the sealing gasket 205 can radially and uniformly expand, a better sealing effect is achieved,
preferably, the gasket 204 may be provided in plurality, so that it has a certain thickness, so that the sealing pad 205 can be sufficiently compressed, thereby achieving a better sealing effect.
In a preferred embodiment, a locknut 208 is further provided at the lower end of the supporting member 206, as shown in fig. 12, to prevent the supporting member 206 from following the rotation during the rotation of the pressing member 203, which results in insufficient pressing force on the sealing gasket 205 and poor sealing effect.
According to the utility model discloses, utilize above-mentioned tubular product helium mass spectrum leak hunting device can seal the tubular product that awaits measuring, and then use the helium mass spectrum to leak hunting, leak hunting including the method of following step:
in a preferred embodiment, after the support 206 is screwed, a locknut 208 is installed at the lower end of the support 206;
in a preferred embodiment, before the pipe helium mass spectrometer leak detection device is placed in the pipe to be detected, sealing oil is coated on the outer side of the sealing gasket 205 to achieve a better sealing effect;
step 4, connecting a vacuum connector 201 in the pipe helium mass spectrum leakage detection device with a helium mass spectrum detector, starting a vacuum pump of the helium mass spectrum detector, and starting vacuumizing until the vacuum degree in the pipe to be detected is less than 5 pa;
if the helium mass spectrometer does not respond, the pipe to be detected has no leak point, if the helium mass spectrometer responds, the pipe to be detected has the leak point, and the size of the leak point can be roughly determined according to the size of current on the helium mass spectrometer;
and 7, rotating the lower pressing piece 203 upwards to enable the sealing gasket 205 not to be extruded any more, recovering the original shape of the sealing gasket 205, and taking down the pipe helium mass spectrometer leak detection device from the pipe to be detected.
If the pipe is found to have a leak source after being detected by the pipe helium mass spectrometer leak detection device, the pipe can be detected block by the device for detecting the leak source of the pipe butt weld helium mass spectrometer, and then the position of the leak source is determined.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate the position or positional relationship based on the operation state of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention has been described in detail with reference to the preferred embodiments and the exemplary embodiments. It should be noted, however, that these specific embodiments are only illustrative explanations of the present invention, and do not set any limit to the scope of the present invention. Without departing from the spirit and scope of the present invention, various modifications, equivalent replacements, or modifications may be made to the technical content and embodiments thereof, which all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (10)
1. A helium mass spectrometer leak detection device for a butt weld of a pipe and a pipe is characterized in that,
comprises a box body (1), a box body joint (5) and a helium mass spectrometer,
the box body (1) is covered on the outer wall of the pipe to be measured,
the box body joint (5) is arranged on the box body (1) and is used for connecting the helium mass spectrometer,
the box body (1) is provided with a through hole (101) so that the box body (1) is covered on the welding seam of the outer wall of the pipe to be tested, the interior of the box body (1) is of a hollow structure so that a certain gap is formed between the interior of the box body (1) and the outer wall of the pipe to be tested,
the box body (1) comprises a lower box body (103) and an upper box body (102) which are detachably arranged,
the lower box body (103) and the upper box body (102) are fastened together through a box body clamping piece (2),
the box body joint (5) is provided with a through hole, so that the helium mass spectrometer is communicated with the inner space of the box body (1).
2. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 1,
the diameter of the through hole (101) is not larger than the outer diameter of the pipe to be measured, and the difference between the diameter of the through hole (101) and the outer diameter of the pipe to be measured is 0-3 mm.
3. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 2,
the box body clamping piece (2) is a butterfly screw, a fixing frame (104) is arranged at the corresponding position of the upper box body (102) and the lower box body (103) respectively, a screw hole is formed in the fixing frame (104), and the lower box body (103) and the upper box body (102) are fastened by screwing the butterfly screw.
4. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 2,
the box holder (2) is a C-shaped clamp, the C-shaped clamp is provided with a clamping frame (21) and a clamping bolt (22), the cross section of the clamping frame (21) is C-shaped, a threaded hole is formed in one end of the clamping frame (21) to place the clamping bolt (22), and a bulge (211) is further arranged at the other end of the clamping frame (21).
5. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 1,
the box body joint (5) is detachably arranged on the box body (1).
6. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 5,
the box body (1) is provided with an interface hole (105), internal threads are arranged in the interface hole (105), and one end of the box body joint (5) is provided with a screw rod (51) corresponding to the internal threads of the interface hole (105).
7. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 6,
a sealing gasket (4) is arranged between the screw (51) and the interface hole (105).
8. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 1,
the device also comprises a vacuum extension pipe (6), wherein the vacuum extension pipe (6) is a pipe with vacuum interfaces at two ends.
9. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 1,
the device is provided with a three-way valve (8), wherein a first end of the three-way valve (8) is connected with a pipeline to be tested, a second end of the three-way valve is connected with a barometer (9), a third end of the three-way valve is a movable connecting end (10), and the movable connecting end (10) is of a vacuum interface structure.
10. The tube-to-tube butt weld helium mass spectrometer leak detection apparatus of claim 1,
the device is provided with a helium filling pipe (11), one end of the helium filling pipe (11) is connected with a pipeline to be tested through a threaded sleeve (111), the other end of the helium filling pipe is a standard vacuum interface, and a pipeline valve (112) is further arranged on the helium filling pipe (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921767540.7U CN210603768U (en) | 2019-10-21 | 2019-10-21 | Helium mass spectrometer leak detection device for butt weld of pipe and tube |
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| CN201921767540.7U CN210603768U (en) | 2019-10-21 | 2019-10-21 | Helium mass spectrometer leak detection device for butt weld of pipe and tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595698A (en) * | 2019-10-21 | 2019-12-20 | 哈电集团（秦皇岛）重型装备有限公司 | Helium mass spectrometer leak detection device and method for butt weld of pipe and tube |
| CN112179578A (en) * | 2020-09-17 | 2021-01-05 | 西安航天动力研究所 | Tool and method for detecting leakage rate of diaphragm valve high-pressure helium mass spectrometer |
| CN114235300A (en) * | 2021-12-21 | 2022-03-25 | 上海电气核电设备有限公司 | Helium accumulation holding box and detection method thereof |
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2019
- 2019-10-21 CN CN201921767540.7U patent/CN210603768U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595698A (en) * | 2019-10-21 | 2019-12-20 | 哈电集团（秦皇岛）重型装备有限公司 | Helium mass spectrometer leak detection device and method for butt weld of pipe and tube |
| CN112179578A (en) * | 2020-09-17 | 2021-01-05 | 西安航天动力研究所 | Tool and method for detecting leakage rate of diaphragm valve high-pressure helium mass spectrometer |
| CN112179578B (en) * | 2020-09-17 | 2021-07-20 | 西安航天动力研究所 | Tool and method for detecting leakage rate of diaphragm valve high-pressure helium mass spectrometer |
| CN114235300A (en) * | 2021-12-21 | 2022-03-25 | 上海电气核电设备有限公司 | Helium accumulation holding box and detection method thereof |
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