CN109737263B - High-pressure sealing method for pipe joint - Google Patents
High-pressure sealing method for pipe joint Download PDFInfo
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- CN109737263B CN109737263B CN201811640126.XA CN201811640126A CN109737263B CN 109737263 B CN109737263 B CN 109737263B CN 201811640126 A CN201811640126 A CN 201811640126A CN 109737263 B CN109737263 B CN 109737263B
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Abstract
The invention discloses a high-pressure sealing method for a pipe joint, which comprises the following steps: installing or preparing a sealing device; the sealing device is inserted into the pipe joint (1) and torque is applied to the fastener (6) or the assembly to realize sealing. The sealing device comprises an elastic part (3) and a connecting part which can apply axial force to the elastic part (3) and enable the elastic part (3) to deform in the radial direction, wherein the connecting part comprises a connecting rod (2) and a fastening part (6) connected with the connecting rod (2). The sealing method has good sealing performance, and the adopted sealing device has simple structure, few processing procedures, convenient operation, economy and reasonableness, can be repeatedly utilized, and is applied to the technical field of high-pressure sealing of various vessel pipe joints.
Description
Technical Field
The invention relates to a sealing method, in particular to a pipe joint sealing method.
Background
Industrial vessels, particularly pressure vessels, often involve non-flanged pipe joint sealing techniques provided on such pressure vessels, for example pressure vessels requiring all pipe joints on the vessel to be sealed during pressure testing, and batch or heat exchange pipes requiring the ends of the pipes to be pressure sealed during pressure testing.
The conventional sealing technical means is to weld a sealing cover on the pipe orifice of a pipe by adopting a welding technology, and cut off the sealing cover after a pressure test is qualified, but the sealing technical means has the following defects: 1. the cutting allowance of the connecting pipe needs to be reserved, so that the cost is high; 2. after the sealing cover is cut and removed, the procedures such as groove processing and the like are required to be carried out on the pipe orifice, the operation is complex, and the cost is high; 3. low repeated utilization rate and poor economical efficiency.
Therefore, it is highly desirable to develop a method for sealing a pipe joint, which has simple processing steps, convenient operation, easy disassembly, reusability, and is economical and reasonable.
Disclosure of Invention
In order to overcome the problems, the inventor of the present invention has made intensive studies and developed a pipe joint sealing method, which comprises sealing the pipe joint with a sealing device, wherein the sealing device comprises an elastic member and a connecting member capable of applying an axial force to the elastic member and radially deforming the elastic member, the connecting member comprises a connecting rod and a fastening member, the elastic member is disposed between the connecting rod and the fastening member, and the elastic member is elastically deformed radially outward by shortening a distance between a large end of the connecting rod and the fastening member, so that the elastic member is tightly attached to an inner wall of the pipe, and a static friction force between the elastic member and the inner wall of the pipe is increased, thereby sealing the pipe joint.
The invention aims to provide a pipe joint sealing method, which comprises the following steps:
and 2, extending the sealing device into the pipe joint, and applying torque to the fastening piece or the assembly to realize sealing.
In step 1, the sealing device comprises an elastic member and a connecting member capable of applying an axial force to the elastic member and radially deforming the elastic member.
The connecting piece comprises a connecting rod and a fastener connected with the connecting rod.
The connecting surfaces at the two ends of the connecting rod are perpendicular to the axis of the connecting rod, one end of the connecting rod, which can extend into the interior of the pipe joint, is a large end, the area of the cross section of the connecting rod, which is perpendicular to the axis, is larger than the area of the cross section of the other end (small end), and the fastener is connected with the small end of the connecting rod.
The elastic piece is located between the connecting rod and the fastening piece, the outer diameter of the elastic piece is smaller than the inner diameter of the pipe joint, and preferably the elastic piece is sleeved at the small end of the connecting rod.
The elastic part is an elastic pipe, and the Shore hardness of the elastic part is 50-100, preferably 65-85, and more preferably 75; the both ends of elastic component are equipped with the bell mouth, and the bell mouth is by the outer end of elastic component 3 towards the inner wall convergent, and the angle beta of bell mouth is 0 ~ 180, preferably 60 ~90, more preferably 60.
The end face of the big end of the connecting rod, which is close to the small end, is matched with the tapered hole of the elastic part, the big end of the connecting rod (2) is provided with a tapered revolution surface matched with the tapered hole of the elastic part (3), and the angle of the tapered vertex angle of the tapered revolution surface is equal to the angle beta of the tapered hole of the elastic part (3).
The number of the elastic pieces is one to more, preferably more than or equal to 2, a top ring is arranged between any two elastic pieces, and the top ring is sleeved at the small end of the connecting rod.
The top ring is provided with a conical surface matched with the conical hole of the elastic piece, preferably, two top rings are arranged between any two elastic pieces, and the two end surfaces with large outer diameters of the two top rings are matched in pairs.
The small end of the connecting rod is further sleeved with a gasket, one surface of the gasket is in contact fit with the fastener, the other surface of the gasket is in contact fit with the top ring, and the outer diameters of the gasket and the fastener are smaller than the inner diameter of the pipe joint.
At the small end of the connecting rod there is a torque-exerting assembly located at the end of the fastener remote from the elastic element, which assembly comprises a special nut I, a nut II and a rod.
The special nut I and the nut II are in threaded connection with the connecting rod, the rod is connected with the special nut I, the axis of the rod is perpendicular to the axis of the connecting rod, and at least one nut II is arranged at each of two ends of the special nut I.
Wherein, step 1 comprises the following substeps:
step 1), sleeving the elastic piece, the top ring, the gasket and the fastening piece on the small end of the connecting rod,
and 2) connecting the assembly with the small end of the connecting rod through threads.
And 2, extending the sealing device in the step 1 into the pipe joint, wherein the large end of the connecting rod, the elastic piece and the top ring are arranged in the pipe joint, preferably, the gasket is also arranged in the pipe joint, and the fastening piece is arranged outside the pipe joint and is tightly attached to the gasket.
In the step 2, torque is applied to the fastening piece or the assembly piece, the distance between the fastening piece and the large end of the connecting rod is shortened, the elastic piece generates elastic deformation outwards in the radial direction, and the elastic piece is tightly attached to the inner wall of the pipe joint, so that sealing is realized.
The pipe joint sealing method provided by the invention can achieve the following beneficial effects:
(1) the pipe joint sealing method of the invention applies axial force to the elastic part by shortening the distance between the big end of the connecting rod and the fastening piece, so that the elastic part generates radial elastic deformation and is tightly attached to the inner wall of the pipe, the static friction force between the elastic part and the inner wall of the pipe is increased, and the sealing of the pipe joint is realized;
(2) the sealing method can apply torque through the fastening piece or the assembly part far away from the fastening piece, shorten the distance between the fastening piece and the large end of the connecting rod, and apply axial force to the elastic piece to enable the elastic piece to generate radial elastic deformation and be tightly attached to the inner wall of the pipe, so that the sealing of the pipe joint is realized;
(3) the sealing device adopted by the method is provided with a plurality of elastic pieces, a top ring matched with the elastic pieces is arranged between the elastic pieces, the top ring plays a role in transmitting axial force, so that the elastic pieces are subjected to uniform axial force and can generate uniform elastic deformation outwards in the radial direction, the elastic pieces are tightly attached to the inner wall of the pipe, the sealing effect is good, and the sealing device is particularly suitable for occasions with higher sealing pressure, and the sealing pressure of the sealing device can reach 100 MPa;
(4) the sealing device adopted by the method has the advantages of simple structure, convenient operation, low cost and repeated use, and the sealing method has good sealing performance and is suitable for the technical field of high-pressure sealing of pipe orifices of various containers.
Drawings
Fig. 1 is a sectional view showing a pipe joint sealing device and a pipe joint according to an embodiment of the present invention;
FIG. 2 shows a cross-sectional view of a spring according to an embodiment of the invention;
FIG. 3 illustrates a cross-sectional view of a top ring of an embodiment of the present invention;
the reference numbers illustrate:
1-pipe joint;
2-a connecting rod;
3-an elastic member;
4-top ring;
5-a gasket;
6-a fastener;
7-special nut I;
8-a rod;
9-nut II.
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.
Industrial vessels such as pressure vessels are required to be sealed at the time of pressure test, and pressure test is performed on vessels under high pressure, and in order to ensure smooth performance of pressure test, it is required to ensure sealability of pipe joints under high pressure.
According to the present invention, there is provided a pipe joint sealing method comprising the steps of:
and 2, extending the sealing device into the pipe joint (1) to apply torque to the fastening piece (6) or the assembly to realize sealing.
According to the invention, in step 1, the high-pressure sealing device comprises an elastic member 3 and a connecting member capable of applying an axial force to the elastic member 3 and radially deforming the elastic member 3.
According to the invention, the elastic part 3 can generate elastic deformation, when the pipe joint 1 is sealed, the elastic part 3 is arranged in the pipe joint 1, the elastic part 3 can generate radial elastic deformation by applying axial force to the elastic part 3, the radial elastic deformation is vertical to the axis of the pipe joint, and the elastic part 3 can be tightly attached to the inner wall of the pipe after being subjected to radial elastic deformation, so that the sealing of the pipe joint 1 is realized.
According to the invention, after the elastic member 3 is elastically deformed in the radial direction, the outer diameter of the elastic member 3 is larger than the outer diameter of the inner wall of the pipe, so that interference fit is realized, the static friction force between the elastic member 3 and the inner wall of the pipe is increased by adjusting the fastening member 6 between the elastic member 3 and the inner wall of the pipe, and a better sealing effect can still be ensured when the pipe is in a high-pressure state.
According to the invention, the connection piece in step 1 comprises a connecting rod 2 and a fastening piece 6 connected to the connecting rod 2.
In the invention, the connecting surfaces of the two ends of the connecting rod 2 are vertical to the axis of the connecting rod 2.
According to the invention, the end of the tie rod 2 that can protrude inside the pipe joint 1 is a large end, the area of its cross section perpendicular to the axis of the tie rod 2 being greater than the area of the cross section of the other end (small end).
According to a preferred embodiment of the present invention, as shown in fig. 1, the large end and the small end of the tie rod 2 are both a solid of revolution formed with the axis of the tie rod 2 as the center line, the outer diameter of the large end of the tie rod 2 is larger than that of the small end, preferably, the small end of the tie rod 2 is a long rod shape, the length of the small end of the tie rod 2 is larger than that of the large end, and when the pipe joint 1 is sealed, the small end of the tie rod 2 is partly inside the pipe joint and partly outside the pipe joint.
According to a further preferred embodiment of the invention, the largest outer diameter of the large end of the tie rod 2 is smaller than the pipe inner diameter of the pipe fitting 1, so that the large end of the tie rod 2 is ensured to be able to enter completely into the pipe fitting 1.
According to the present invention, as shown in fig. 1, the outer diameter of the large end of the tie rod 2 is a rotating body which is first increased and then decreased in the direction along the small end, thereby providing a certain buffer effect on the internal pressure of the pipe.
According to the invention, in step 1, the fastening member 6 is sleeved on the small end of the connecting rod 2, thereby realizing the connection with the connecting rod 2.
According to the invention, the connecting rod 2 is in threaded connection with the fastening piece 6, the connecting rod 2 is provided with external threads, the fastening piece 6 is provided with internal threads, preferably, the connecting rod 2 is a rod piece which is machined by a terminal and is threaded, and the fastening piece 6 is a nut II which can be in threaded fit with the connecting rod 2, as shown in figure 1.
The elastic part 3 is positioned between the large end of the connecting rod 2 and the fastening part 6, the outer diameter of the elastic part 3 is smaller than the inner diameter of the pipe joint 1, the elastic part 3 can extend into the pipe joint 1, and after the elastic part 3 is elastically deformed in the direction perpendicular to the axis of the pipe joint 1, the outer diameter of the elastic part 3 is increased and clings to the inner diameter of the pipe joint 1, so that the sealing of the pipe joint 1 is realized.
According to the invention, the elastic part 3 is sleeved at the small end of the connecting rod 2, preferably, the elastic part 3 is an elastic tube, the inner diameter of the elastic part 3 is larger than the outer diameter of the small end of the connecting rod 2, the distance between the large end of the connecting rod 2 and the fastening part 6 is shortened, so that axial force can be applied to the elastic part 3, and the elastic part 3 is elastically deformed after being subjected to the axial force.
The inventor finds that the elastic deformation of the elastic part 3 after being subjected to the axial force can be radial inward elastic deformation and also can be radial outward elastic deformation, if the radial inward elastic deformation occurs, the elastic part 3 can be unstable and collapse, the elastic part can not be attached to the inner wall of the pipe joint 1, and sealing can not be realized, so that the elastic part 3 only can be ensured to be subjected to radial outward elastic deformation.
According to the present invention, as shown in fig. 2, the elastic member 3 is an elastic tube, preferably a hollow elastic tube, tapered holes are provided at both ends of the elastic member 3, the tapered holes are tapered from the outer end to the inner wall of the elastic member 3, and the angle β of the tapered holes is 0 to 180 °, preferably 60 to 90 °, and more preferably 60 °.
According to the invention, as shown in fig. 2, the inner diameter of the elastic member 3 is larger than the outer diameter of the small end of the connecting rod 2, the outer diameter of the elastic member 3 is smaller than the inner diameter of the pipe joint 1, and preferably the contact surface of the inner wall of the elastic member 3 with the outer wall of the small end of the connecting rod 2 is parallel to the axis of the small end of the connecting rod 2.
According to the invention, the outer diameter of the elastic part 3 sleeved on the connecting rod 2 is smaller than the inner diameter of the pipe joint 1, namely, after the elastic part 3 is sleeved on the small end of the connecting rod 2, the outer diameter of the elastic part 3 when the elastic part is not subjected to axial force is smaller than the inner diameter of the pipe joint 1, so that the sealing device can be ensured to extend into the pipe joint 1 for sealing.
According to the invention, the end face of the large end of the connecting rod 2 close to the small end is fitted with a conical bore of the elastic element 3. The big end of connecting rod 2 is close to the tip and is equipped with the toper surface of revolution that cooperates with the bell mouth of elastic component 3, and the angle of the toper apex angle of this toper surface of revolution needs to be unanimous with the toper angle beta of elastic component 3 to make the toper surface of revolution of connecting rod 2 and the toper internal surface of elastic component 3 laminate completely and compress tightly when adjusting fastener 6, thereby realize sealedly.
According to the invention, the number of elastic elements 3 is one to several, preferably greater than or equal to 2.
According to the invention, the top ring 4 is arranged between the elastic members 3, the top ring 4 can be sleeved on the small end of the connecting rod 2, preferably, the top ring 4 is in a revolving body shape, the axis of the top ring is overlapped with the axis of the connecting rod 2, and the top ring 4 is provided with a conical surface matched with the conical hole of the elastic member 3, as shown in fig. 3, when the elastic member 3 is extruded, because the two ends of the elastic member 3 are inward conical surfaces and the top ring 4 is an outward conical surface, the top ring 4 extrudes the elastic member 3, so that the elastic member 3 only can generate elastic deformation radially outward, the outer wall of the elastic member 3 is attached to the inner wall of the pipe, sealing is realized, and the top ring 4 can transmit the action of axial force, so that each elastic member 3 is uniformly stressed and controllably deformed, and is particularly suitable for the condition of high sealing pressure.
According to the invention, because the two ends of each elastic piece 3 are provided with inward conical surfaces and the top ring 4 is an outward conical surface, in order to ensure that a plurality of elastic pieces 3 are tightly attached to the top ring 4, two top rings 4 are arranged between the two elastic pieces 3, and the end surfaces of the two top rings 4 with large outer diameters are tightly attached.
According to the increase of the sealing pressure, the sealing of the nozzle can be realized by increasing the number of the elastic member 3 and the top ring 4.
According to the invention, the small end of the connecting rod 2 is also sleeved with a gasket 5, one surface of the gasket 5 is in contact fit with the fastener 6, the other surface of the gasket 5 is in contact fit with the end surface with the large outer diameter of the top ring 4, and the outer diameters of the gasket 5 and the fastener 6 are smaller than the inner diameter of the pipe joint 1, so that the gasket 5 and the fastener 6 can enter the pipe joint.
According to the present invention, the end face of the top ring 4 having a large outer diameter is brought into close contact with the washer 5, so that the elastic member 3, the top ring 4, the tie bar 2, the washer 5 and the fastener 6 form a seal section. Through shortening the distance between 2 main ends of connecting rod and the fastener 6, exert axial force to elastic component 3, because the transmission effect of top ring 4 to axial force for elastic component 3 atress is even, and it is controllable to warp, makes elastic component 3 take place elastic deformation and the pipe inner wall closely laminates, realizes sealedly, through increasing the applicable occasion in that sealing pressure is higher of the quantity of elastic component 3 and top ring 4, this sealing device can realize sealing pressure scope 0.1 ~ 100 MPa.
According to the present invention, the elastic member 3 is made of a soft or high polymer material with foaming property, and is preferably an elastic tube made of a material commonly used in the art, such as rubber (e.g. nitrile rubber, thermoplastic elastomer, ethylene propylene diene monomer rubber), plastic (e.g. polyethylene plastic, polyvinyl chloride plastic, etc.) or a composite of rubber and plastic, such as rubber elastic tube, which is elastically deformed when being subjected to pressure.
According to the present invention, the shore hardness of the elastic member 3 is 50 to 100, preferably 65 to 85, and more preferably 75. The hardness of elastic component 3 is too big, is difficult to take place elastic deformation or needs very big pressure just can take place deformation, leads to sealed the degree of difficulty great, and the hardness of elastic component 3 is too little, and if sealing pressure is great, then elastic component 3 is also great with the inner wall sealing friction of coupling 1, and the not enough requirement that easily leads to its frictional resistance can not satisfy the axial force of elastic component 3's intensity and produce and slide thereby make sealed inefficacy.
According to the invention, at the small end of the connecting rod 2 there is provided a torque-exerting assembly provided at the end of the fastening member 6 remote from the elastic element 3, preferably at the end of the small end of the connecting rod 2. I.e. the fastening member 6 is located between the elastic member 3 and the assembly.
According to the invention, the assembly comprises a special nut I7, a nut II9 and a rod 8. The combined part is in threaded connection with the small end of the connecting rod 2, a special nut I7 and a special nut II9 are in threaded connection with the small end of the connecting rod 2, and preferably two nuts II9 are arranged at two ends of the special nut I7 respectively. The rod 8 is connected with a special nut I7, and the axis of the rod 8 is perpendicular to the axis of the connecting rod 2.
Can exert the effect of axial force to elastic component 3 and top ring 4 through shortening the distance between connecting rod 2 main aspects and fastener 6, exert axial force accessible two kinds of modes and realize: on the one hand, the distance between the large end of the connecting rod 2 and the fastener 6 can be shortened by screwing the fastener 6, preferably by screwing the connecting rod 2 into the fastener 6, and by tightening the fastener 6; on the other hand, the fastener 6 is fixed, and the connecting rod 2 is rotated by applying a torque to the rod 8, thereby shortening the distance between the large end of the connecting rod 2 and the fastener 6.
According to the invention, in step 1, the method for mounting the high-pressure sealing device of the pipe joint comprises the following substeps:
step 1), sleeving the elastic part 3, the top ring 4, the washer 5 and the fastener 6 on the small end of the connecting rod 2.
According to the invention, in the step 1), the elastic part 3 is matched with the large end of the connecting rod 2, the end face with large outer diameter of the top ring 4 is matched with the gasket 5, the elastic parts 3 and the top rings 4 are arranged between the large end of the connecting rod 2 and the gasket 5 and between the large end of the connecting rod and the fastening part 6 according to the sealing pressure requirement, the quantity meets the sealing pressure requirement, two top rings 4 are arranged between every two elastic parts 3, and the end faces with large outer diameters of the two top rings 4 are matched.
In order to ensure that the elastic piece 3, the top ring 4, the gasket 5, the fastening piece 6 and the connecting rod 2 can be stably matched, the fastening piece 6 can apply a pretightening force, and the pretightening force ensures that each part sleeved on the connecting rod 2 can be in close contact with each other and cannot be in a loose state.
Further comprising: and 2) connecting the assembly with the small end of the connecting rod 2 through threads.
According to the invention, in order to shorten the distance between the large end of the connecting rod 2 and the fastener 6 by applying torque conveniently, a threaded connection assembly can be arranged at the small end of the connecting rod 2, firstly, a nut II9 is arranged on the connecting rod 2, then, a special nut I7 is arranged and is tightly attached to a nut II9, wherein, the special nut I7 is connected with a rod 8, then, another nut II9 is connected with the connecting rod 2 and is tightly attached to a nut I7, so that the special nut I7 is positioned between the two nuts II9, and the special nut I7 is fixed by tightly attaching the two nuts II9 and the nut I7.
And 2, extending the sealing device into the pipe joint 1, and applying torque to the fastening piece 6 or the assembly to realize sealing.
According to the invention, step 2, the prepared or installed high-pressure sealing device is inserted into the pipe joint 1, and torque is applied to the fastening member 6 or the assembly to shorten the distance between the fastening member 6 and the large end of the connecting rod 2, thereby achieving sealing.
According to the invention, the device of step 1 is inserted into the pipe joint 1, the large end of the tie rod 2, the elastic element 3, the top ring 4 are inside the pipe joint 1, preferably the washer 5 is also inside the pipe joint 1, the fastening element 6 is outside the pipe joint and is in close contact with the washer 5, as shown in fig. 1.
The distance between the large end of the connecting rod 2 and the fastening member 6 can be shortened by applying a turning torque to the fastening member 6, preferably by screwing the connecting rod 2 to the fastening member 6, by tightening the fastening member, the elastic pieces 3 are exerted with axial force, under the action of the axial force of the top ring 4, each elastic piece 3 is exerted with the axial force and the action of vertical force vertical to the axis of the pipe joint 1 because of the conical structure of the top ring 4, the stress is uniform, the deformation is controllable, the vertical force causes the elastic member 3 to elastically deform radially outward, the outer diameter of the elastic member 3 increases and abuts against the inner diameter of the coupling boss 1, because of the restriction of the inner diameter of the pipe joint 1, the elastic element 3 is tightly attached to the inner wall of the pipe joint 1, pressure perpendicular to the axis is generated between the elastic element and the pipe joint, the axial static friction force between the two is increased, so that the whole sealing device has the function of sealing the pipe orifice under the action of pressure.
Through applying moment to the subassembly, fix fastener 6, apply moment to pole 8 for the main aspects of connecting rod 2 rotate to the direction that is close to fastener 6, thereby shortened the distance between 2 main aspects of connecting rod and fastener 6, make elastic component 3 take place radial outside elastic deformation, closely laminate with the inside pipe wall, realize the sealed of coupling 1.
According to the invention, the method for removing the sealing device from the coupling 1: firstly, the elastic fastener 6 (or the fixed fastener 6, and the moment is applied to the rod 8 to loosen the connecting rod 2) is put in place, namely, the axial force between the connecting rod 2 and the fastener 6 is removed, so that the outer diameter of the elastic part 3 is reduced to a state of no elastic deformation, the outer diameter of the elastic part 3 is smaller than the inner diameter of the pipe joint 1, and the pressure between the elastic part 3 and the inner wall of the pipe joint 1 is removed, namely, the static friction force with the inner wall of the pipe is removed, so that the sealing device can be integrally taken out from the pipe joint 1, the disassembly is completed, and the sealing device is convenient to disassemble and can.
In the process of pressure test of the container, leakage detection is carried out on the sealing structure, and the method can be adopted as follows: 1. and (3) hydraulic test: the sealing boundary has no leakage, no visible deformation and abnormal sound, and the pressure in the pressure test pressure maintaining process is kept unchanged; 2. air pressure test: the device has no visible deformation and abnormal sound, the sealing boundary can be detected by soap liquid or other leakage detection liquid, and the pressure is kept unchanged in the pressure test and pressure maintaining process.
The pipe joint sealing method can realize high-pressure sealing, can be suitable for occasions with higher sealing pressure by increasing the number of the elastic parts 3 and the top rings 4, can realize the sealing pressure range of 0.1-100 MPa, realizes pressure sealing by utilizing the adhesion of the elastic parts extending into the pipe joint and the inner wall of the pipe, is detachable, avoids the method for welding a pipe orifice sealing cover adopted in the prior art, and also avoids the steps of cutting the sealing cover and processing the pipe orifice in the later period.
Examples
The pipe joint sealing method is applied to pressure tests of heat transfer pipes of nuclear power steam generator equipment, and the specifications of the heat transfer pipes
And the tightness (or airtightness) of the sealing device is detected,
the sealing device provided by the invention is used for detecting the sealing performance of the heat transfer pipe of the nuclear power steam generator equipment, no visible deformation and abnormal sound are found at the sealing position, no gas leakage is detected by coating soap liquid on the sealing boundary, the pressure is not changed in the pressure test pressure maintaining process, and the sealing performance is good.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on operational states of the present invention, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention has been described in detail with reference to the preferred embodiments and illustrative examples. It should be noted, however, that these specific embodiments are only illustrative of the present invention and do not limit the scope of the present invention in any way. Various modifications, equivalent substitutions and alterations can be made to the technical content and embodiments of the present invention without departing from the spirit and scope of the present invention, and these are within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (6)
1. A method of high pressure sealing a pipe joint, the method comprising the steps of:
step 1, installing or preparing a high-pressure sealing device;
the sealing device comprises an elastic part (3) and a connecting part which can apply axial force to the elastic part (3) and can lead the elastic part (3) to generate radial deformation,
the connecting piece comprises a connecting rod (2) and a fastener (6) connected with the connecting rod (2),
the connecting surfaces at the two ends of the connecting rod (2) are vertical to the axis of the connecting rod (2), one end of the connecting rod is a big end, the other end of the connecting rod is a small end, wherein one end of the connecting rod which can extend into the pipe joint (1) is a big end, the area of the cross section of the connecting rod which is vertical to the axis is larger than the area of the cross section of the small end, the fastening piece (6) is connected with the small end of the connecting rod (2),
the elastic part (3) is an elastic tube, the Shore hardness of the elastic part (3) is 65-85, two ends of the elastic part (3) are provided with tapered holes, the tapered holes are gradually reduced from the outer end surface to the inner wall of the elastic part (3), the angle beta of the tapered holes is 60-90 degrees,
the end surface of the big end of the connecting rod (2) close to the small end is matched with the conical hole of the elastic part (3), the big end of the connecting rod (2) close to the small end is provided with a conical revolution surface matched with the conical hole of the elastic part (3), the angle of the conical vertex angle of the conical revolution surface is equal to the angle beta of the conical hole of the elastic part (3),
the number of the elastic pieces (3) is more than or equal to 2, a top ring (4) is arranged between any two elastic pieces (3), the top ring (4) is sleeved at the small end of the connecting rod (2), a conical surface matched with the elastic pieces (3) is arranged on the top ring (4), the two end surfaces of the two top rings (4) with large outer diameters are matched in pairs,
step 2, extending the sealing device into the pipe joint (1) to apply torque to the fastening piece (6) or the assembly to realize sealing;
the sealing device in the step 1 is stretched into the pipe joint (1), the big end of the connecting rod (2), the elastic piece (3) and the top ring (4) are arranged in the pipe joint (1), the gasket (5) is also arranged in the pipe joint (1), the fastening piece (6) is arranged outside the pipe joint (1) and is tightly attached to the gasket (5),
a combination piece for applying torque is arranged at the small end of the connecting rod (2), the combination piece is positioned at one end of the fastening piece (6) far away from the elastic piece (3), the combination piece comprises a special nut I (7), a nut II (9) and a rod (8),
special nut I (7), nut II (9) and connecting rod (2) threaded connection, pole (8) are connected with special nut I (7), and the axis of pole (8) is perpendicular with the axis of connecting rod (2), the both ends of special nut I (7) are equipped with one nut II (9) respectively at least.
2. The method according to claim 1, wherein, in step 1,
the elastic piece (3) is located between the connecting rod (2) and the fastening piece (6), and the outer diameter of the elastic piece (3) is smaller than the inner diameter of the pipe joint (1).
3. Method according to claim 2, characterized in that the elastic element (3) is fitted over the small end of the connecting rod (2).
4. A method according to any one of claims 1 to 3, characterized in that the small end of the connecting rod (2) is also fitted with a washer (5), one side of said washer (5) being in contact engagement with the fastening member (6), the other side of the washer (5) being in contact engagement with the top ring (4), the outer diameters of the washer (5) and the fastening member (6) being smaller than the inner diameter of the pipe joint (1).
5. The method according to claim 4, characterized in that step 1 comprises the following sub-steps:
step 1), sleeving an elastic piece (3), a top ring (4), a gasket (5) and a fastener (6) on the small end of a connecting rod (2),
and 2) connecting the assembly with the small end of the connecting rod (2) through threads.
6. A method according to claim 1, characterized in that in step 2, a torque is applied to the fastening member (6) or the assembly to shorten the distance between the fastening member (6) and the large end of the connecting rod (2), the elastic member (3) is elastically deformed radially outwards, and the elastic member (3) is tightly fitted against the inner wall of the pipe joint (1) to achieve sealing.
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| CN201811640126.XA CN109737263B (en) | 2018-12-29 | 2018-12-29 | High-pressure sealing method for pipe joint |
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| CN201811640126.XA CN109737263B (en) | 2018-12-29 | 2018-12-29 | High-pressure sealing method for pipe joint |
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| CN109737263B true CN109737263B (en) | 2021-04-02 |
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| CN110739089B (en) * | 2019-10-23 | 2021-04-02 | 哈电集团（秦皇岛）重型装备有限公司 | Glue filling penetration sealing structure and sealing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1888513A (en) * | 2006-07-14 | 2007-01-03 | 朱军华 | Pipe pluging |
| CN102177384A (en) * | 2008-08-28 | 2011-09-07 | 卡-博投资有限公司 | Internal restraint device |
| CN203548898U (en) * | 2013-09-30 | 2014-04-16 | 贵州黎阳航空动力有限公司 | Hole sealing device |
| CN204239970U (en) * | 2014-11-18 | 2015-04-01 | 鲍波 | Pipeline is swollen plug |
| CN206468985U (en) * | 2016-12-26 | 2017-09-05 | 中国核工业二三建设有限公司 | Hydraulic test of pipeline plugging device |
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