CN210802808U - Welding seam leakage detection tool - Google Patents

Abstract

The utility model discloses a welding seam leak hunting frock relates to welding seam gas tightness and detects technical field to solve the problem that the curved surface welding seam can't carry out the gas tightness and detect. The welding seam leakage detection tool is used for detecting the air tightness of a curved surface welding seam, the two sides of a shell at which the curved surface welding seam is located at least comprise a curved surface, the welding seam leakage detection tool comprises a first sealing assembly and a second sealing assembly which are arranged on the two sides of the curved surface welding seam and are in sealing connection with the two sides of the curved surface welding seam respectively, the first sealing assembly and/or the second sealing assembly comprise a curved surface cover plate, the radian of the curved surface cover plate is consistent with the radian of the curved surface of the shell at which the curved surface welding seam is located, and the first sealing assembly, the second sealing assembly and the shell at which the curved surface. The utility model discloses an gas tightness for welding seam detects.

Description

Welding seam leakage detection tool

Technical Field

The utility model relates to a welding seam gas tightness detects technical field, especially relates to a welding seam leak hunting frock.

Background

Welding is a manufacturing process and technique for joining metals or other thermoplastic materials, such as plastics, in a heated, high temperature or high pressure manner. In view of wide application range of welding, good connection performance, and easiness in securing airtightness, i.e., water tightness, a welding method is generally used for connecting the vacuum chambers. In order to ensure the airtight welding, the airtightness of the welded seam needs to be detected.

At present, the vacuum chamber is usually connected by a flange, wherein a connecting pipe is arranged between the flange and the vacuum chamber, the vacuum chamber is welded with the connecting pipe, and the connecting pipe is welded with the flange. However, when the casing of the vacuum chamber is a curved surface, the conventional seam leakage detection device can only detect the air tightness of a planar seam and cannot detect the air tightness of a curved surface seam, so that the air tightness of the curved surface seam between the vacuum chamber with the casing being a curved surface and the adapter tube cannot be detected.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a welding seam leak hunting frock to solve the problem that the curved surface welding seam can't carry out the gas tightness and detect.

In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:

the utility model provides a welding seam leak hunting frock, an air tightness for the curved surface welding seam detects, the both sides of the casing at curved surface welding seam place include a curved surface at least, including setting up respectively in curved surface welding seam both sides and with curved surface welding seam both sides sealing connection's first seal assembly and second seal assembly, first seal assembly and/or second seal assembly include the curved surface apron, the radian of curved surface apron is unanimous with the radian of the curved surface that the casing at curved surface welding seam place includes, first seal assembly, the casing at second seal assembly and curved surface welding seam place forms the enclosure space.

Optionally, under the condition that two sides of the shell where the curved surface welding seam is located include a curved surface and a plane, the first sealing assembly includes a curved surface cover plate, the radian of the curved surface cover plate is consistent with the radian of the curved surface included by the shell where the curved surface welding seam is located, the second sealing assembly includes a plane cover plate, and the curved surface cover plate, the plane cover plate and the shell of the curved surface welding seam form a closed space.

Furthermore, a sealing rubber ring is arranged between the curved surface cover plate and the shell of the curved surface welding line.

Further, the internally mounted of sealing rubber circle has the sealing washer support that is used for blockking the inside shrink of sealing rubber circle, and the edge of sealing washer support is equipped with the mounting groove, and the sealing rubber circle passes through the mounting groove cover on the sealing washer support.

Optionally, the sealing ring support is provided with a reinforcing rib inside.

Optionally, under the condition that both sides of the casing where the curved-surface weld seam is located are curved surfaces, the curved-surface cover plate of the first sealing assembly and/or the curved-surface cover plate of the second sealing assembly are/is provided with an adapter for connecting with the weld seam leakage detection device.

Optionally, an adapter for connecting with the welding seam leakage detection device is arranged on the plane cover plate.

Furthermore, the adaptor is an adaptor flange, one end of the adaptor flange is detachably connected with the plane cover plate, and the other end of the adaptor flange is connected with the welding seam leakage detection equipment.

Furthermore, a support sealing ring is arranged between the adapter flange and the plane cover plate.

Optionally, a sealing gasket is arranged between the planar cover plate and the shell of the curved surface welding line.

The embodiment of the utility model provides a welding seam leak hunting frock for the gas tightness of curved surface welding seam detects, and the both sides of the casing at curved surface welding seam place include a curved surface at least. The welding seam leakage detection tool comprises a first sealing assembly and a second sealing assembly which are arranged on two sides of a curved surface welding seam respectively and are in sealing connection with the two sides of the curved surface welding seam, and the first sealing assembly, the second sealing assembly and a shell where the curved surface welding seam is located form a closed space. Specifically, there is a curved surface in the both sides of the casing at curved surface welding seam place and two connection faces of first seal assembly and second seal assembly sealing connection at least, first seal assembly and/or second seal assembly include the curved surface apron, the radian of curved surface apron is unanimous with the radian of the curved surface that the casing at curved surface welding seam place includes, the curved surface apron can form closely laminating with above-mentioned curved surface promptly, make curved surface and curved surface apron sealing connection that the casing at curved surface welding seam place includes, therefore, first seal assembly, second seal assembly can form enclosure space with the casing at curved surface welding seam place. In this case, the helium mass spectrometer leak detection method can be adopted to perform airtightness detection on the curved surface weld. Specifically, when a helium mass spectrometer leak detection method is adopted to detect the air tightness of a curved surface welding seam, welding seam leak detection equipment is a detector; firstly, carrying out air-tight connection on one side of a curved surface weld joint by using a detector; then, vacuumizing the closed space through a detector; finally, spraying helium at the curved surface weld joint by using a spray gun; when the detector responds, the curved surface welding line has a leak hole; otherwise, the air tightness of the curved surface welding seam is good. Can know by the aforesaid, the embodiment of the utility model provides a welding seam leak hunting frock can carry out the leak rate test to the curved surface welding seam, has solved the problem that the curved surface welding seam can't carry out the gas tightness and detect.

Drawings

Fig. 1 is a schematic structural diagram of the hermetic connection between the welding seam leakage detection tool and a first to-be-detected member in the embodiment of the present invention;

fig. 2 is a schematic structural diagram of the hermetic connection between the welding seam leakage detection tool and a second to-be-detected member in the embodiment of the present invention;

fig. 3 is an exploded view of the weld seam leak detection tool and a second workpiece to be detected according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a curved surface cover plate of the welding seam leakage detection tool according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first sealing assembly of the welding seam leakage detection tool according to the embodiment of the present invention;

fig. 6 is a top view of a seal ring bracket of the welding seam leakage detection tool according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a seal ring support provided with a seal rubber ring of the weld seam leakage detection tool according to the embodiment of the present invention;

fig. 8 is a partial cross-sectional view of a seal ring support with a seal rubber ring installed in the weld seam leakage detection tool according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a planar cover plate provided with a transfer flange of the welding seam leakage detection tool according to the embodiment of the present invention;

fig. 10 is a cross-sectional view of a vacuum flange of a weld leak detection tool according to an embodiment of the present invention;

fig. 11 is the utility model discloses a local cross-sectional view of the knife edge department of the vacuum flange of welding seam leak hunting frock.

Reference numerals:

1-curved surface welding seam; 2-a shell; 21-curved wall; 22-connection pipe; 23-a vacuum flange; 231-a seal groove; 232-knife edge; 3-a first seal assembly; 31-curved cover plate; 311-a handle; 32-a seal ring support; 321-reinforcing ribs; 33-sealing rubber ring; 4-a second seal assembly; 41-a planar cover plate; 42-an adaptor; 421-adapter flange; 43-bracket seal ring; 44-sealing gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

At present, the airtightness of the welding seam is usually detected by a helium mass spectrum leak detection method. The helium mass spectrum leak detection method specifically comprises the following steps: firstly, communicating a to-be-detected piece with a detector; then, vacuumizing the interior of the piece to be detected; and finally, spraying helium gas at a position where a leak hole possibly exists in the welding seam of the detected device by using a spray gun, wherein if the leak hole exists at a certain position of the detected device, the detector responds.

The embodiment of the utility model provides a welding seam leak hunting frock, refer to fig. 1, fig. 2 and fig. 3, an airtightness for curved surface welding seam 1 detects, the both sides of casing 2 at curved surface welding seam 1 place include a curved surface at least, this welding seam leak hunting frock is including setting up respectively in curved surface welding seam 1 both sides and with first seal assembly 3 and the second seal assembly 4 of 1 both sides sealing connection of curved surface welding seam, first seal assembly 3 and/or second seal assembly 4 include curved surface apron 31, the radian of curved surface apron 31 is unanimous with the radian of casing 2 at curved surface welding seam 1 place, first seal assembly 3, second seal assembly 4 forms the enclosure space with casing 2 at curved surface welding seam 1 place.

The embodiment of the utility model provides a welding seam leak hunting frock for refer to fig. 1, fig. 2 and fig. 3, the gas tightness of curved surface welding seam 1 detects, and the both sides of casing 2 at curved surface welding seam 1 place include a curved surface at least. The welding seam leakage detection tool comprises a first sealing assembly 3 and a second sealing assembly 4 which are respectively arranged on two sides of a curved surface welding seam 1 and are in sealing connection with the two sides of the curved surface welding seam 1, wherein the first sealing assembly 3, the second sealing assembly 4 and a shell 2 where the curved surface welding seam 1 is located form a closed space. Specifically, at least one curved surface exists in two connecting surfaces of two sides of a shell 2 where the curved surface welding line 1 is located and the first sealing assembly 3 and the second sealing assembly 4 in sealing connection, the first sealing assembly 3 and/or the second sealing assembly 4 comprise a curved surface cover plate 31, the radian of the curved surface cover plate 31 is consistent with that of the shell 2 where the curved surface welding line 1 is located, namely the curved surface cover plate 31 can be tightly attached to the curved surfaces, so that the curved surface of the shell 2 where the curved surface welding line 1 is located is in sealing connection with the curved surface cover plate 31, and therefore the first sealing assembly 3 and the second sealing assembly 4 can form a closed space with the shell 2 where the curved surface welding line 1 is located. In this case, the helium mass spectrometer leak detection method can be adopted to perform airtightness detection on the curved surface weld. Specifically, when the helium mass spectrometer leak detection method is adopted to detect the air tightness of the curved surface weld seam 1, the weld seam leak detection equipment is a detector; firstly, performing air-tight connection on one side of a curved surface weld joint 1 by using a detector; then, vacuumizing the closed space through a detector; finally, spraying helium at the curved surface weld joint 1 by using a spray gun; when the detector responds, the curved surface welding seam 1 has a leak hole; otherwise, the air tightness of the curved surface weld 1 is good. Can know by the aforesaid, the embodiment of the utility model provides a welding seam leak hunting frock can carry out the leak rate test to curved surface welding seam 1, has solved curved surface welding seam 1 and can't carry out the problem that the gas tightness detected.

Referring to fig. 2, 3 and 4, in the case that two sides of the housing 2 where the curved surface weld 1 is located include a curved surface and a plane, the first sealing assembly 3 includes a curved surface cover plate 31, and an arc of the curved surface cover plate 31 is identical to an arc of the curved surface included in the housing 2 where the curved surface weld 1 is located, that is, the curved surface cover plate 31 may be tightly attached to the curved surface, so that the curved surface included in the housing 2 where the curved surface weld 1 is located is hermetically connected to the curved surface cover plate 31; the second sealing assembly 4 comprises a planar cover plate 41, the planar cover plate 41 is tightly attached to a plane included by the housing 2 where the curved surface weld 1 is located, so that the plane included by the housing 2 where the curved surface weld 1 is located is hermetically connected with the planar cover plate 41, and the curved surface cover plate 31, the planar cover plate 41 and the housing 2 where the curved surface weld 1 is located form a closed space. In this case, the helium mass spectrometer leak detection method can be adopted to detect the air tightness of the curved surface weld 1. Specifically, when the helium mass spectrometer leak detection method is adopted to detect the air tightness of the curved surface weld seam 1, the weld seam leak detection equipment is a detector; firstly, performing air-tight connection on one side of a curved surface weld joint 1 by using a detector; then, vacuumizing the closed space through a detector; finally, spraying helium at the curved surface weld joint 1 by using a spray gun; when the detector responds, the curved surface welding seam 1 has a leak hole; otherwise, the air tightness of the curved surface weld 1 is good. Can know by the aforesaid, the embodiment of the utility model provides a welding seam leak hunting frock can carry out the leak rate test to curved surface welding seam 1, has solved curved surface welding seam 1 and can't carry out the problem that the gas tightness detected.

It should be understood that, as shown in fig. 1, in the case that both sides of the casing 2 where the curved-surface weld 1 is located are curved surfaces, the first sealing assembly 3 and the second sealing assembly 4 both include curved-surface cover plates, and the two curved-surface cover plates are respectively attached to the two curved surfaces included in the casing 2 where the curved-surface weld 1 is located, so that the two curved-surface cover plates and the casing 2 where the curved-surface weld 1 is located form a closed space, and the helium mass spectrometry method can also be used to perform the airtightness detection on the curved-surface weld 1. The detection process is the same as the detection process of the curved surface and the plane on the two sides of the shell 2 where the curved surface weld 1 is located, and the description is omitted here.

In order to further explain the utility model, the following uses the curved surface welding seam formed between the connecting pipe that CF400 flange contained on the cylindrical vacuum chamber and the curved surface wall of the vacuum chamber as an example to the utility model provides a structure of welding seam detection frock and application in the gas tightness detection of curved surface welding seam carry out the detailed description, are only for further explaining the features and advantages of the utility model, but are not the limitations of the claims of the utility model. At this time, as shown in fig. 2 and 3, the housing 2 in which the curved weld 1 is located is composed of a curved wall 21, a nozzle 22, and a vacuum flange 23 welded to the nozzle 22. In this case, the curved surface of the casing 2 in which the curved surface weld 1 is located is the surface of the curved surface wall 21 of the vacuum chamber away from the adapter 22, and the arc of the curved surface cover plate 31 is identical to the arc of the curved surface of the casing 2 in which the curved surface weld 1 is located, that is, the arc of the curved surface cover plate 31 is identical to the arc of the surface of the curved surface wall 21 away from the adapter 22. The first sealing component 3, the second sealing component 4 and the shell 2 where the curved welding seam 1 is located form a closed space, namely, a closed space formed by the plane cover plate 41, the curved cover plate 31, the curved wall 21, the adapter 22 and the vacuum flange 23.

It should be noted that the size of the curved cover plate 31 is larger than the inner diameter of the vacuum flange 23, so as to completely wrap the curved weld 1; the size of the planar cover plate 41 is greater than or equal to the size of the vacuum flange 23 to seal the end of the nipple 22 remote from the curved wall 21. The flat cover plate 41 is typically made of aluminum, and is lightweight and easy to move or mount during leak detection. In addition, the surface of the flat cover plate 41 away from the curved wall 21 is further provided with a handle for facilitating the taking and placing of the flat cover plate, and similarly, the curved cover plate 31 is provided with a handle 311 for facilitating the taking and placing of the curved cover plate 31. In the process of performing airtightness detection on the curved weld 1 between the curved wall 21 and the connecting pipe 22 by using a helium mass spectrometer leak detection method, before a closed space is vacuumized by a detector, the curved cover plate 31 and the surface of the curved wall 21, which is far away from the connecting pipe 22, can be tightly attached in a pressing mode, so that the curved cover plate 31 is ensured to seal one end, welded with the curved wall 21, of the connecting pipe 22; after the detector vacuumizes the closed space, the curved cover plate 31 can be automatically adsorbed on the curved wall 21 under the action of atmospheric pressure, so that the operation process is simple and convenient, and the implementation is convenient.

When the curved cover plate 31 and the curved wall 21 are directly bonded to each other to form the airtight connection between the curved cover plate 31 and the curved wall 21, the requirement for the machining accuracy of the curved cover plate 31 and the curved wall 21 is extremely high. Therefore, in order to reduce the requirement for the machining accuracy of the curved cover plate 31 and the curved wall 21, the place where the air leaks may be closed by vacuum sealing mud, or a rubber packing 33 may be added between the curved cover plate 31 and the curved wall 21. Illustratively, referring to fig. 3 and 4, a sealing rubber ring 33 is arranged between the curved cover plate 31 and the housing 2 of the curved weld 1, i.e. the sealing rubber ring 33 is arranged between the curved cover plate 31 and the curved wall 21. At this time, after the detector evacuates the enclosed space, the curved cover plate 31 can be automatically adsorbed on the curved wall 21 under the action of atmospheric pressure, and the sealing rubber ring 33 is pressed and clamped between the curved cover plate 31 and the curved wall 21, at this time, a part of the sealing rubber ring 33 can be filled in a concave on the surface of the curved cover plate 31 and/or the curved wall 21, and a protrusion on the surface of the curved cover plate 31 and/or the curved wall 21 corresponds to a concave of the pressing sealing rubber ring 33, so that one side of the curved surface included in the housing 2 where the curved welding seam 1 is located is sealed, and meanwhile, the requirement on the processing precision of the curved cover plate 31 and the curved wall 21 is reduced, and the detector is easy to implement and low in cost.

It should be noted that the material of the sealing rubber ring 33 is not exclusive, and the material of the sealing rubber ring 33 may be one or a combination of more of fluororubber and silicone rubber; it will be appreciated that the diameter of the sealing rubber ring 33 is larger than the inner diameter of the vacuum flange 23 so that the curved weld 1 is located in the enclosed space.

Due to the above-mentioned deformation of the sealing rubber ring 33, the sealing rubber ring 33 may be sucked into the enclosed space during the process of evacuating the enclosed space by the inspection apparatus, which may result in the failure of the airtight connection between the curved cover plate 31 and the curved wall 21. In order to avoid the above situation, as shown in fig. 5, 7 and 8, a gasket support 32 for blocking the inward contraction of the gasket 33 is installed inside the gasket 33, an edge of the gasket support 32 is provided with an installation groove corresponding to the gasket 33, and the gasket 33 is sleeved on the gasket support 32 through the installation groove. Based on this, at the in-process that the detector will be enclosed space evacuation, because sealing rubber circle 33 cover is in the mounting groove of sealing washer support 32 for sealing rubber circle 33 is difficult for deviating from sealing washer support 32, can effectually prevent sealing rubber circle 32 shrink inwards simultaneously, and then has avoided the emergence of the condition that sealing rubber circle 32 was inhaled in the enclosed space.

Optionally, the sealing ring support 32 is made of aluminum, and because the aluminum has low density and is made of a softer material, the sealing ring support 32 made of aluminum with a thinner thickness can be well attached to the curved wall 21 and is not easily broken.

In order to prevent the seal ring holder 32 from being deformed by inward contraction and even broken, referring to fig. 5, 6, and 7, a reinforcing rib 321 is provided inside the seal ring holder 32. In this case, the seal ring holder 32 has an increased resistance to shrinkage in the extending direction of the reinforcing rib 321. Specifically, the reinforcing ribs 321 may be disposed in parallel inside the seal ring support 32, or may be disposed in the seal ring support 32 in a grid shape, the number of the reinforcing ribs 321 and the distribution inside the seal ring support 32 may be determined according to actual conditions, and fig. 7 illustrates an example in which two reinforcing ribs are disposed inside the seal ring support 32 in a cross shape, where the center of the cross is located at the center of the circle of the seal ring support 32.

Since the evacuation tube of the seam leakage detecting device is not necessarily matched with the connection tube 22, and is usually smaller than the aperture of the connection tube 22, in order to facilitate the airtight connection between the seam leakage detecting device and the end of the connection tube 22 far away from the curved wall 21, referring to fig. 3, an adapter 42 for connecting the seam leakage detecting device is disposed on the planar cover plate 41. The adapter 42 is arranged on the plane cover plate 41, so that compared with the adapter 42 arranged on the curved cover plate 31, the difficulty is low, and the implementation is convenient. In addition, the adapter 42 is arranged on the plane cover plate 41, so that the closed space can be vacuumized by fixedly connecting the welding seam leakage detection equipment with the adapter 42, the plane cover plate 41 does not need to be detached in the detection process, and the operation is simple.

It should be understood that under the condition that both sides of the shell where the curved surface weld 1 is located are curved surfaces, the curved surface cover plate of the first sealing assembly 3 and/or the curved surface cover plate of the second sealing assembly 4 are/is provided with an adapter for being connected with the weld seam leakage detecting device, so that the weld seam leakage detecting device and the adapter are fixedly connected to vacuumize the closed space, the curved surface cover plate does not need to be detached in the detection process, and the operation is simple.

In some embodiments, referring to fig. 2 and 9, the adaptor 42 is an adaptor flange 421, one end of the adaptor flange 421 is detachably connected to the flat cover plate 41, and the other end is connected to the weld seam leakage detecting device. Therefore, the appropriate adapter flange 421 is selected according to the vacuum tube of the welding seam leakage detection device, so that the situation that the adapter 42 is independently designed on the plane cover plate 41 according to the vacuum tube of the welding seam leakage detection device is avoided, and only the installation structure needs to be designed on the plane cover plate 41 corresponding to the required adapter flange 421, and the welding seam leakage detection device is simple in structure and low in cost. Specifically, the plane cover plate 41 is provided with a through hole, the adapter flange 421 is located above the through hole, a bottom plate of the adapter flange 421 is provided with a threaded through hole, and a bolt passes through the threaded through hole on the bottom plate of the adapter flange 421 and is fastened to the plane cover plate 41. The screw hole on the flat cover plate 41 screwed with the adapter flange 421 cannot be penetrated, so as to avoid leakage.

It is understood that, in order to ensure the air tightness of the connection between the adapter flange 421 and the flat cover 41, a support sealing ring 43 is provided between the adapter flange 421 and the flat cover 41. When the adapter flange 421 is assembled with the planar cover plate 41, the support sealing ring 43 is first placed in the central hole of the planar cover plate 41 and aligned, then the adapter flange 421 is placed on the support sealing ring 43, and finally the adapter flange is fastened to the threaded hole of the planar cover plate 41 through the adapter flange 421 by using bolts.

In some embodiments, referring to fig. 2 and 3, a sealing gasket 44 is disposed between the planar cover plate 41 and the housing 2 of the curved weld 1, that is, a sealing gasket 44 is disposed between the planar cover plate 41 and the vacuum flange 23, so that the connection between the planar cover plate 41 and the vacuum flange 23 is tighter, and the air tightness of the connection between the planar cover plate 41 and the vacuum flange 23 is ensured. The material of the sealing gasket 44 may be one or more of fluororubber and silicone rubber, and the size of the sealing gasket 44 is determined according to the size of the vacuum flange 23, specifically, referring to fig. 3, 10 and 11, the inner diameter of the sealing gasket 44 is the same as the inner diameter d1 of the vacuum flange 23, and the outer diameter of the sealing gasket 44 is equal to the diameter d3 of the sealing groove 231 of the vacuum flange 23. The distance between the knife edge 232 at the upper edge of the sealing groove 231 of the vacuum flange 23 and the outer edge of the sealing groove 231 is very small (the knife edge diameter is marked as d2 in fig. 10), the outer diameter of the sealing pad 44 needs to be strictly controlled, otherwise, if the inner side of the knife edge 232 is reached, the sealing effect cannot be achieved.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a welding seam leak hunting frock for the gas tightness of curved surface welding seam detects, the both sides of the casing at curved surface welding seam place include a curved surface at least, its characterized in that, including set up respectively in curved surface welding seam both sides and with curved surface welding seam both sides sealing connection's first seal assembly and second seal assembly, first seal assembly and/or second seal assembly includes the curved surface apron, the radian of curved surface apron with the radian of the curved surface that the casing at curved surface welding seam place includes is unanimous, first seal assembly second seal assembly with the casing at curved surface welding seam place forms the enclosure space.

2. The weld seam leakage detecting tool according to claim 1, wherein the first sealing assembly comprises a curved cover plate under the condition that two sides of the shell where the curved weld seam is located comprise a curved surface and a plane, the radian of the curved cover plate is consistent with that of the curved surface of the shell where the curved weld seam is located, the second sealing assembly comprises a plane cover plate, and the curved cover plate, the plane cover plate and the shell where the curved weld seam is located form a closed space.

3. The welding seam leakage detection tool according to claim 1 or 2, wherein a sealing rubber ring is arranged between the curved surface cover plate and the casing of the curved surface welding seam.

4. The welding seam leakage detecting tool according to claim 3, wherein a sealing ring support used for blocking inward contraction of the sealing rubber ring is installed inside the sealing rubber ring, an installation groove is formed in the edge of the sealing ring support, and the sealing rubber ring is sleeved on the sealing ring support through the installation groove.

5. The weld seam leakage detection tool according to claim 4, wherein reinforcing ribs are arranged inside the sealing ring support.

6. The welding seam leakage detection tool according to claim 1, wherein under the condition that both sides of the shell where the curved surface welding seam is located are curved surfaces, an adapter used for being connected with welding seam leakage detection equipment is arranged on the curved surface cover plate of the first sealing assembly and/or the curved surface cover plate of the second sealing assembly.

7. The weld seam leakage detection tool according to claim 2, wherein an adapter piece used for being connected with the weld seam leakage detection device is arranged on the plane cover plate.

8. The weld seam leakage detecting tool according to claim 7, wherein the adapter is an adapter flange, one end of the adapter flange is detachably connected with the plane cover plate, and the other end of the adapter flange is connected with the weld seam leakage detecting device.

9. The weld seam leak detection tool according to claim 8, wherein a support sealing ring is arranged between the adapter flange and the planar cover plate.

10. The weld seam leak detection tool according to claim 2, wherein a sealing gasket is arranged between the planar cover plate and the shell of the curved weld seam.

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