CN220566777U - Plugging structure and low-temperature joint - Google Patents

Abstract

The utility model relates to the technical field of low-temperature transportation, in particular to a plugging structure and a low-temperature joint. The embodiment of the utility model provides a plugging structure, which is applied to a male unit of a low-temperature connector, wherein the low-temperature connector comprises the male unit and a female unit, the male unit and the female unit are respectively communicated with an external pipeline and low-temperature equipment, the male unit comprises an inner pipe and an outer pipe, the inner pipe is sleeved in the outer pipe, the inner pipe and the outer pipe are sealed through a sealing piece, the sealing piece is cylindrical and is sleeved on the outer wall of the inner pipe, one end of the sealing piece is connected with one end of the outer pipe and plugs a space between the inner pipe and the outer pipe, an external thread is arranged on the outer wall of the sealing piece, the plugging structure is a cylinder with one end closed and one end open, an internal screw is arranged inside the plugging structure, and the external screw of the sealing piece is matched with the internal screw of the plugging structure to plug the inner pipe. The embodiment of the utility model provides a plugging structure and a low-temperature connector, which can seal a male head on the basis of ensuring that the male head is not deformed.

Description

Plugging structure and low-temperature joint

Technical Field

The utility model relates to the technical field of low-temperature transportation, in particular to a plugging structure and a low-temperature joint.

Background

The low-temperature joint is a connecting structure for connecting low-temperature equipment and an external pipeline, and can ensure the tightness of connection and reduce the loss of cold. The low-temperature joint comprises a male head and a female head, the male head is welded on an external pipeline, the female head is welded on low-temperature equipment, and the male head and the female head are in sealing connection so as to realize sealing connection between the low-temperature equipment and the external pipeline. After the male head is welded on an external pipeline, the tightness of the external pipeline needs to be detected first, and when the tightness of the external pipeline is detected, one end of the male head, which is connected with the female head, needs to be sealed.

In the related art, a sealing plate is welded at one end of a male head for connecting with a female head to realize sealing. However, the welding can cause local deformation of the male head, and the male head cannot be connected with the female head in a sealing manner after the sealing plate is removed.

Therefore, in order to solve the above problems, there is an urgent need for a plugging structure capable of sealing a male head on the basis of ensuring that the male head is not deformed.

Disclosure of Invention

The embodiment of the utility model provides a plugging structure and a low-temperature connector, which can seal a male head on the basis of ensuring that the male head is not deformed.

In a first aspect, an embodiment of the present utility model provides a plugging structure, which is applied to a male unit of a low-temperature connector, where the low-temperature connector includes the male unit and a female unit, the male unit and the female unit are respectively communicated with an external pipeline and a low-temperature device, the male unit includes an inner pipe and an outer pipe, the inner pipe is sleeved in the outer pipe, the inner pipe and the outer pipe are sealed by a sealing element, the female unit includes a sleeve and a connecting pipe disposed at one end of the sleeve, the inner pipe is connected with the sleeve in a sealing manner, and the inner pipe is communicated with the connecting pipe;

the sealing element is in a cylinder shape, the sealing sleeve is arranged on the outer wall of the inner tube, one end of the sealing element is connected with one end of the outer tube, the inner tube is blocked with a space between the outer tube, the outer wall of the sealing element is provided with external threads, the blocking structure is a cylinder body with one end closed and one end open, an inner spiral is arranged inside the blocking structure, and the outer spiral of the sealing element is matched with the inner spiral of the blocking structure to block the inner tube.

In one possible design, the cross section of the outer surface of the sealing element passing through the axis of the sealing element comprises a first ladder shape, the first ladder shape comprises a first ladder surface and a second ladder surface from outside to inside in sequence, the first ladder surface and the second ladder surface are connected through a first transition surface, the external thread of the sealing element is arranged on the second ladder surface, the cross section of the inner surface of the opening end of the sealing element passing through the axis of the sealing element comprises a second ladder shape, the second ladder shape comprises a third ladder surface and a fourth ladder surface from outside to inside in sequence, the third ladder surface and the fourth ladder surface are connected through a second transition surface, the internal thread of the sealing element is arranged on the fourth ladder surface, and the sealing element is connected through a thread fit, so that the first transition surface and the second transition surface are attached through screwing the sealing element.

In one possible design, a gasket is provided on the first transition surface and/or the second transition surface.

In one possible design, the seal is fixed to the inner tube and the outer tube by welding.

In one possible design, the seal is provided with a groove near the outer tube for releasing the welding stress to reduce welding deformation.

In a second aspect, an embodiment of the present utility model further provides a cryogenic joint, including a male unit, a female unit, and the plugging structure described in any one of the foregoing embodiments, where the male unit and the female unit are respectively connected with an external pipe and a cryogenic device, the male unit includes a male welding seat, a male sealing member, an inner pipe, and an outer pipe, the male welding seat is used for connecting the external pipe, the male sealing member is in sealed connection with the male welding seat and the outer pipe, the outer wall of the inner pipe is in sealed connection with the male sealing member through a baffle, the inner pipe is sleeved in the outer pipe, the inner pipe and the outer pipe are sealed through a sealing member, the female unit includes a female connecting member, a sleeve, and a connecting pipe disposed at one end of the sleeve, the female connecting member is used for connecting the sleeve and the connecting pipe, the female sealing member is disposed at one end of the sleeve, the inner pipe is in sealed connection with the sleeve, and the male sealing member is in sealed connection with the connecting pipe, and the female sealing member is in sealed connection with the nut;

the blocking structure is used for blocking the inner pipe through threaded fit.

In one possible design, the lock nut is sleeved outside the male sealing element, the male sealing element and the lock nut are rotationally connected through steel balls, an annular groove is formed between the lock nut and the male sealing element, the female sealing element is provided with an annular protrusion matched with the annular groove, threads are arranged on the outer side of the annular protrusion, threads are arranged on the inner side of the lock nut, the annular protrusion of the female sealing element is rotationally inserted into the annular groove along the threads by rotating the lock nut, and the inner side of the annular protrusion is tightly attached to the male sealing element to realize sealing.

In one possible design, the annular projection is provided with a sealing O-ring.

In one possible embodiment, the seal and the female connector are connected by a sealing ring.

In one possible design, the seal ring is a tetrafluoro seal ring.

Compared with the prior art, the utility model has at least the following beneficial effects:

the plugging structure is applied to a male unit of a low-temperature connector. The low-temperature connector comprises a male unit and a female unit, wherein the male unit and the female unit are connected with an external pipeline and low-temperature equipment respectively, and then are connected with each other to finally complete the communication between the external pipeline and the low-temperature equipment. The male unit comprises an inner tube and an outer tube, and vacuum is pumped between the inner tube and the outer tube for reducing heat leakage. The inner pipe and the outer pipe are sealed by a sealing element, the sealing element is in a cylindrical shape and is sealed and sleeved on the outer wall of the inner pipe, and one end of the sealing element is connected with and seals the outer pipe. And an external thread is processed on the outer wall of the sealing element so that the sealing element is connected with the plugging structure through the thread. The sealing structure is a cylindrical structure with one end open and one end closed, the opening end of the sealing structure faces the sealing element, the inner wall of the sealing structure is provided with internal threads, the sealing element is in sealing connection with the sealing structure through the matching of the internal threads and the external threads, at the moment, the inner pipe is positioned in the sealing structure, one end of the sealing structure is sealed, and the opening end of the other end of the sealing structure is in sealing connection with the sealing element, so that the sealing structure is independently used for sealing the inner pipe of the male unit. In addition, threaded connection can dismantle to, the process of installation dismantlement can not lead to the sealing member to warp, installs female head unit after the sealing test of external pipeline of being convenient for accomplish.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a plugging structure according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a low-temperature joint according to an embodiment of the present utility model.

In the figure:

100-male unit;

101-an inner tube;

102-an outer tube;

103-a seal;

1031-grooves;

104-a gasket;

105-male head welding seat;

106-male seal;

107-baffle;

200-a female unit;

201-female connector;

202-a female seal;

203-a sleeve;

204-connecting the pipes;

205-sealing O-rings;

206-sealing ring;

300-plugging structure;

400-locking nut;

401-steel balls.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.

In the description of embodiments of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance unless explicitly specified or limited otherwise; the term "plurality" means two or more, unless specified or indicated otherwise; the terms "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, it should be understood that the terms "upper", "lower", and the like used in the embodiments of the present utility model are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present utility model. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

As shown in fig. 1, the embodiment of the utility model provides a plugging structure, which is applied to a male unit 100 of a low-temperature joint, wherein the low-temperature joint comprises a male unit 100 and a female unit 200, the male unit 100 and the female unit 200 are respectively communicated with an external pipeline and low-temperature equipment, the male unit 100 comprises an inner pipe 101 and an outer pipe 102, the inner pipe 101 is sleeved in the outer pipe 102, the inner pipe 101 and the outer pipe 102 are sealed through a sealing piece 103, the female unit 200 comprises a sleeve 203 and a connecting pipe 204 arranged at one end of the sleeve 203, the inner pipe 101 is in sealing connection with the sleeve 203, and the inner pipe 101 is communicated with the connecting pipe 204;

the sealing element 103 is in a cylinder shape, is arranged on the outer wall of the inner tube 101 in a sealing manner, one end of the sealing element 103 is connected with one end of the outer tube 102 and seals a space between the inner tube 101 and the outer tube 102, the outer wall of the sealing element 103 is provided with external threads, the sealing structure 300 is a cylinder body with one end being closed and one end being open, an inner screw is arranged inside the sealing structure 300, and the outer screw of the sealing element 103 is matched with the inner screw of the sealing structure 300 to seal the inner tube 101.

The plugging structure 300 provided by the application is applied to the male unit 100 of the low-temperature connector. The low-temperature connector comprises a male unit 100 and a female unit 200, wherein after the male unit 100 and the female unit 200 are respectively connected with an external pipeline and low-temperature equipment, the male unit 100 and the female unit 200 are connected, and finally the external pipeline and the low-temperature equipment are communicated. The male unit 100 includes an inner tube 101 and an outer tube 102, and in order to reduce leakage heat, a vacuum is drawn between the inner tube 101 and the outer tube 102. The inner tube 101 and the outer tube 102 are sealed by a sealing element 103, the sealing element 103 is in a cylindrical shape and is sealed and sleeved on the outer wall of the inner tube 101, and one end of the sealing element 103 is connected with and seals the outer tube 102. External threads are machined on the outer wall of the seal 103 to facilitate the threaded connection of the seal 103 to the closure structure 300. The sealing structure 300 is a cylindrical structure with one end open and one end closed, the open end of the sealing structure 300 faces the sealing element 103, the inner wall of the sealing structure 300 is provided with internal threads, the sealing element 103 is in sealing connection with the sealing structure 300 through the matching of the internal threads and the external threads, at this time, the inner pipe 101 is positioned in the sealing structure 300, one end of the sealing structure 300 is sealed, and the open end of the other end is in sealing connection with the sealing element 103, so that the sealing structure 300 independently seals the inner pipe 101 of the male unit 100. In addition, the screw connection can be disassembled, and the process of assembling and disassembling does not cause deformation of the sealing member 103, so that the female unit 200 can be conveniently assembled after the sealing test of the external pipeline is completed.

In some embodiments of the present utility model, the cross section of the outer surface of the sealing member 103 passing through the axis thereof includes a first step shape, the first step shape includes a first step surface and a second step surface sequentially from outside to inside, the first step surface and the second step surface are connected by a first transition surface, the external thread of the sealing member 103 is disposed on the second step surface, the cross section of the inner surface of the opening end of the plugging structure 300 passing through the axis thereof includes a second step shape, the second step shape includes a third step surface and a fourth step surface sequentially from outside to inside, the third step surface and the fourth step surface are connected by a second transition surface, the internal thread of the plugging structure 300 is disposed on the fourth step surface, and the first transition surface and the second transition surface are attached by screwing the plugging structure 300 after the plugging structure 300 is connected to the sealing member 103 by a screw fit.

In this embodiment, the first step and the second step each include upper and lower symmetrically distributed. Since the two pairs are only different in distribution positions, only one of the two pairs is described below with respect to the first step and the second step, and the other pair has the same effect, and will not be described again. The first ladder-shaped and the second ladder-shaped are matched in ladder shape, the second ladder-shaped surface and the fourth ladder-shaped surface are matched and attached, external threads and internal threads are respectively arranged on the second ladder-shaped surface and the fourth ladder-shaped surface, and the sealing element 103 and the plugging structure 300 are sealed and attached through the external threads and the internal threads. As the two are connected by the thread and have the matched stepped structure, as the plugging structure 300 is screwed by the thread, the first transition surface of the sealing member 103 and the second transition surface of the plugging structure 300 are tightly attached, and the tightness between the sealing member 103 and the plugging structure 300 is finally improved.

The first transition surface may be perpendicular to the first step surface and/or the second step surface, or may be non-perpendicular. The second transition surface may or may not be perpendicular to the third step surface and/or the fourth step surface.

In some embodiments of the utility model, the first transition surface and/or the second transition surface is provided with a gasket 104.

In this embodiment, in order to further increase the tightness between the seal 103 and the blocking structure 300, a gasket 104 is provided on the first transition face and/or the second transition face.

In some embodiments of the utility model, the seal 103 is secured to the inner tube 101 and the outer tube 102 by welding.

In this embodiment, the welding can achieve stable and sealed connection, and the process is mature and easy to implement.

In some embodiments of the present utility model, the seal 103 is provided with a groove 1031 near the outer tube 102, the groove 1031 being used to relieve welding stress to reduce welding distortion.

In this embodiment, a groove 1031 is provided in the sealing member 103 near the outer tube 102, and the groove 1031 can release the welding stress to reduce the welding deformation.

As shown in fig. 2, the embodiment of the present utility model further provides a cryogenic joint, including a male unit 100, a female unit 200, and a plugging structure 300 according to any one of the foregoing embodiments, where the male unit 100 and the female unit 200 are respectively communicated with an external pipeline and a cryogenic device, the male unit 100 includes a male welding seat 105, a male sealing member 106, an inner pipe 101 and an outer pipe 102, the male welding seat 105 is used for connecting the external pipeline, the male sealing member 106 is in sealing connection with the male welding seat 105 and the outer pipe 102, the outer wall of the inner pipe 101 is in sealing connection with the male sealing member 106 through a baffle 107, the inner pipe 101 is sleeved in the outer pipe 102, the inner pipe 101 and the outer pipe 102 are sealed through a sealing member 103, the female unit 200 includes a female connecting member 201, a female sealing member 202, a sleeve 203, and a connecting pipe 204 disposed at one end of the sleeve 203, the female sealing member 202 is disposed at one end of the sleeve 203, the inner pipe 101 is in sealing connection with the sleeve 204, the inner pipe 101 is in sealing connection with the sleeve 202, the male sealing member 106 is sleeved in sealing connection with the inner pipe 106, and the male sealing member 106 and the female sealing member 106 are in sealing connection with the female sealing member 400 through a nut 400;

the blocking structure 300 blocks the inner tube 101 by a threaded fit.

The embodiment of the low-temperature joint and the embodiment of the plugging structure 300 provided in the present application are based on the same inventive concept, so that the same beneficial effects can be obtained, and specific effects refer to the embodiment of the plugging structure 300 and are not repeated here.

In some embodiments of the present utility model, the lock nut 400 is sleeved outside the male seal 106, the two are rotationally connected through the steel ball 401, an annular groove is formed between the lock nut 400 and the male seal 106, the female seal 202 is provided with an annular protrusion matched with the annular groove, the outer side of the annular protrusion is provided with threads, the inner side of the lock nut 400 is provided with threads, the annular protrusion of the female seal 202 is rotationally inserted into the annular groove along the threads by rotating the lock nut 400, and the inner side of the annular protrusion is tightly attached to the male seal 106 to realize sealing.

In this embodiment, the lock nut 400 is sleeved outside the male seal 106, and the lock nut 400 and the male seal 106 are rotatably connected by a steel ball 401. An annular groove exists between the lock nut 400 and the male seal 106, and the side walls of the annular groove are formed by the lock nut 400 and a portion of the male seal 106, respectively. The outside of the annular groove is provided with threads, the outside of the annular bulge of the female head sealing piece 202 is provided with threads, and the locking nut 400 rotates to drive the annular bulge to be screwed into the annular groove, so that the annular groove and the annular bulge are in sealing connection.

In some embodiments of the utility model, a sealing O-ring 205 is provided on the annular protrusion.

In this embodiment, the sealing O-ring 205 can further increase the tightness between the annular protrusion and the annular groove. Of course, the sealing O-ring 205 may also be provided on the annular groove.

In some embodiments of the utility model, the seal 103 and the female connector 201 are connected by a seal ring 206.

In this embodiment, the seal ring 206 can increase the tightness between the seal 103 and the female connector 201.

In some embodiments of the utility model, the seal 206 is a tetrafluoro seal 206.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. The plugging structure is characterized by comprising a male unit (100) applied to a low-temperature joint, wherein the low-temperature joint comprises the male unit (100) and a female unit (200), the male unit (100) and the female unit (200) are respectively communicated with an external pipeline and low-temperature equipment, the male unit (100) comprises an inner pipe (101) and an outer pipe (102), the inner pipe (101) is sleeved in the outer pipe (102), the inner pipe (101) and the outer pipe (102) are sealed through a sealing piece (103), the female unit (200) comprises a sleeve (203) and a connecting pipe (204) arranged at one end of the sleeve (203), the inner pipe (101) is in sealing connection with the sleeve (203), and the inner pipe (101) is communicated with the connecting pipe (204);

sealing member (103) are the tube-shape, and the seal in cover is located the outer wall of inner tube (101), the one end of sealing member (103) is connected outer tube (102) one end, and shutoff inner tube (101) with the space between outer tube (102), the outer wall of sealing member (103) is provided with the external screw thread, sealing structure (300) are one end closed one end open-ended barrel, sealing structure (300) inside is provided with the internal screw, sealing member (103) the external screw with sealing structure (300)'s internal screw cooperation is in order to seal inner tube (101).

2. The plugging structure according to claim 1, wherein a cross section of an outer surface of the sealing member (103) passing through an axis thereof comprises a first step-like shape, the first step-like shape comprising a first step-like surface and a second step-like surface in order from outside to inside, the first step-like surface and the second step-like surface being connected by a first transition surface, an external thread of the sealing member (103) being provided on the second step-like surface, an inner surface of an opening end of the plugging structure (300) comprising a second step-like shape, the second step-like shape comprising a third step-like surface and a fourth step-like surface in order from outside to inside, the third step-like surface and the fourth step-like surface being connected by a second transition surface, an internal thread of the plugging structure (300) being provided on the fourth step-like surface, the first transition surface and the second transition surface being brought into abutment by screwing the plugging structure (300) after the sealing member (103) is connected by a screw-fitting.

3. The occlusion structure of claim 2, wherein a sealing gasket (104) is provided on the first transition surface and/or the second transition surface.

4. The plugging structure according to claim 1, wherein the seal (103) is fixed to the inner tube (101) and the outer tube (102) by welding.

5. The plugging structure according to claim 4, wherein the sealing member (103) is provided with a groove (1031) at a position close to the outer tube (102), the groove (1031) being for releasing welding stress to reduce welding deformation.

6. A cryogenic joint characterized by comprising a male unit (100), a female unit (200) and a plugging structure (300) according to any one of claims 1-5, wherein the male unit (100) and the female unit (200) are respectively in communication with an external pipeline and cryogenic equipment, the male unit (100) comprises a male welding seat (105), a male sealing member (106), an inner pipe (101) and an outer pipe (102), the male welding seat (105) is used for connecting the external pipeline, the male sealing member (106) is in sealing connection with the male welding seat (105) and the outer pipe (102), the outer wall of the inner pipe (101) is in sealing connection with the male sealing member (106) through a baffle (107), the inner pipe (101) is sleeved in the outer pipe (102), the inner pipe (101) and the outer pipe (102) are sealed through a sealing member (103), the female unit (200) comprises a female connecting member (201), a female sealing member (202), a sleeve (203) and a sleeve (203) are arranged at one end of the female connecting pipe (203) and the sleeve (203) is connected with the female connecting pipe (204) through the baffle (107), the inner pipe (101) is in sealing connection with the sleeve (203), the inner pipe (101) is communicated with the connecting pipe (204), and the male sealing piece (106) and the female sealing piece (202) are in sealing connection through a locking nut (400);

the blocking structure (300) blocks the inner tube (101) by threaded engagement.

7. The cryogenic joint according to claim 6, characterized in that the lock nut (400) is sleeved outside the male sealing element (106), the lock nut (400) and the male sealing element (106) are rotationally connected through steel balls (401), an annular groove is formed between the lock nut (400) and the male sealing element (106), the female sealing element (202) is provided with an annular protrusion matched with the annular groove, threads are arranged on the outer side of the annular protrusion, threads are arranged on the inner side of the lock nut (400), the annular protrusion of the female sealing element (202) is rotationally inserted into the annular groove along the threads by rotating the lock nut (400), and the inner side of the annular protrusion is tightly attached to the male sealing element (106) to realize sealing.

8. The cryogenic joint according to claim 7, characterized in that the annular protrusion is provided with a sealing O-ring (205).

9. The cryogenic joint according to claim 6, characterized in that the sealing element (103) and the female connector (201) are connected by a sealing ring (206).

10. The cryogenic joint according to claim 9, characterized in that the sealing ring (206) is a tetrafluoro sealing ring (206).