A sealing nut assembly

Abstract

The present invention relates to a sealing nut assembly, which belongs to the technical field of pipeline connection. It solves the leakage problem generated at the connection between the sealing gasket and the pipeline when the valve conduit is connected to the valve under the condition of higher sealing requirements. The present invention comprises a pipeline, a valve conduit, a locking nut and a sealing gasket. One end of the pipeline is plugged into the inside of the valve conduit, a sealing gasket is arranged at the pipeline mouth, the pipeline compresses the valve conduit by pressing the sealing gasket, a locking nut is arranged on the outside of the valve conduit, and also comprises a sealing nut arranged at the valve conduit interface, the sealing nut is provided with a groove, the valve conduit interface is provided with a raised ring corresponding to the groove, the raised ring and the pipeline form a sealing groove, and the sealing nut is deformed to seal and fill the sealing groove. The present invention utilizes the deformation of the sealing nut to seal the valve conduit interface, has a simple structure, and achieves a good sealing effect under the condition of low precision requirements for each component.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline connection and relates to a nut assembly, in particular to a sealing nut assembly. Background Art

[0002] At present, in the market, it is often necessary to use valves to control the fluid or gas in the pipeline. The pipeline is generally connected to the valve through a valve guide, and the pipeline is inserted into the valve guide and fastened with a clamp or a locking nut. Since the sealing through mechanical connection requires a very high axial spacing between the pipeline and the valve guide, and the allowable error range is very small, a sealing gasket is now also used to further seal the pipeline and the valve guide. For example, the Chinese invention patent [application number: CN200510025097.2] discloses a pipeline connection pipe fitting, including a connecting pipe, a connecting nut, a special-shaped gasket, and a structure in which the inner hole of the pipeline connection joint is provided with a step equal to the inner diameter of the stainless steel-plastic composite pipe. The connecting nut of the connecting pipe with a convex arc surface is inserted into the pipeline connection joint, and the special-shaped gasket is pressed to compress the connection pipe seal. The connecting nut is similar in shape to the end of the connecting pipe that is against the convex arc surface. It is easy to connect, seal firmly, operate conveniently, improve work efficiency, and eliminate the defects of loose bonding and concave reduction of inner diameter. However, due to the difference in axial spacing, the connection between the sealing gasket and the pipe cannot be sealed, leakage still occurs, and higher sealing performance requirements cannot be met.

[0003] How to achieve good sealing performance between the valve guide and the pipeline at a lower cost has become an urgent problem to be solved. Summary of the invention

[0004] The object of the present invention is to provide a sealing nut assembly in view of the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sealing nut assembly comprises a pipeline, a valve conduit and a locking nut, wherein one end of the pipeline is inserted into the interior of the valve conduit, and a locking nut is arranged outside the valve conduit. The invention is characterized in that the sealing nut is arranged at the valve conduit interface, the sealing nut is provided with a groove, the valve conduit interface is provided with a raised ring corresponding to the groove, the raised ring and the pipeline enclose a sealing groove, and the sealing nut is sealed in the sealing groove by deformation.

[0007] In the above-mentioned sealing nut assembly, the sealing nut includes a nut body, a lip plate, and a groove formed by the nut body and the lip plate. The nut body is connected to the outer wall of the valve guide, the groove is mortised with the raised ring, and the lip plate cooperates with the sealing groove.

[0008] In the above-mentioned sealing nut assembly, the raised ring is arranged at the interface of the valve guide, and the cross-section of the raised ring is a convex shape, including the bottom surface of the sealing groove, the side surface of the raised ring of the sealing groove, the raised surface, the outer side surface of the raised ring and the outer bottom surface of the raised ring. The side surface of the raised ring of the sealing groove is inclined toward the outer side surface of the raised ring, the raised surface is an inclined surface, and the bottom surface of the sealing groove is a horizontal surface.

[0009] In the above-mentioned sealing nut assembly, the groove includes a groove bottom surface, a groove lip plate side surface and a groove nut body side surface, the groove lip plate side surface and the groove nut body side surface are both inclined toward the nut body, and the groove bottom surface matches the raised surface.

[0010] In the above-mentioned sealing nut assembly, a thread is arranged on the side of the lip plate connected to the pipe, a chamfer is arranged on the end of the lip plate away from the sealing groove, and the length of the lip plate is not greater than half of the length of the sealing nut.

[0011] In the above-mentioned sealing nut assembly, the sealing groove also includes a deformation groove, which is formed by an inclined surface formed by the valve conduit forming the bottom of the sealing groove tilted away from the pipeline and the pipeline, and the inclination angle of the inclined surface of the valve conduit does not exceed 10°.

[0012] In the above-mentioned sealing nut assembly, the protrusion is inclined toward the outer wall of the valve conduit, the outer side surface of the protrusion ring is a vertical surface, and the outer bottom surface of the protrusion ring is an inclined surface, which is inclined toward the outer wall of the valve conduit.

[0013] In the above-mentioned sealing nut assembly, the pipeline is provided with a fastening ring for installing the sealing nut, and a sliding groove is provided on a side of the fastening ring close to the sealing groove.

[0014] In the above-mentioned sealing nut assembly, it also includes a sealing gasket, which seals the pipeline and the valve conduit. The sealing gasket is arranged at the port where the valve conduit and the inner end of the valve conduit are connected. After the sealing nut is installed, the end away from the pipeline fits with the end face of the locking nut.

[0015] In the above-mentioned sealing nut assembly, the sealing nut is formed in one piece, and the material hardness of the sealing nut is smaller than the material hardness of the pipeline and the valve conduit.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. The present invention utilizes the deformation of the sealing nut to seal the valve conduit interface, has a simple structure, and achieves a good sealing effect while requiring low precision for each component.

[0018] 2. The present invention not only utilizes the deformation of the nut, but also utilizes the clamping and thread locking of the sealing nut. At the same time, through the setting of the valve conduit interface and the interaction with the sealing nut, the sealing effect is further enhanced.

[0019] 3. The sealing nut assembly provided by the present invention is easy to operate and suitable for large-scale promotion. Other advantages, objectives and features of the present invention will be partially reflected in the following description and partially understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram provided by the present invention;

[0021] Figure 2 yes Figure 1 A cross-sectional view in one direction;

[0022] Figure 3 It is a cross-sectional view of one direction of the present invention;

[0023] Figure 4 is a cross-sectional view of another direction of the present invention;

[0024] Figure 5 It is a schematic diagram of a part of the present invention;

[0025] Figure 6 is a schematic diagram of another part of the present invention;

[0026] In the figure, pipeline 1, valve guide tube 2, locking nut 3, sealing gasket 4, sealing nut 5, groove 6, raised ring 7, sealing groove 8, nut body 51, lip plate 52, sealing groove bottom surface 71, sealing groove raised ring side surface 72, raised surface 73, raised ring outer side surface 74, raised ring outer bottom surface 75, groove bottom surface 61, groove lip plate side surface 62, groove nut body side surface 63, the groove lip plate side surface 62, groove nut body side surface 63, deformation groove 81, fastening ring 11, and slide groove 111. DETAILED DESCRIPTION

[0027] like Figure 1-4 As shown, a sealing nut assembly includes a pipeline 1, a valve conduit 2, and a locking nut 3, wherein one end of the pipeline 1 is inserted into the interior of the valve conduit 2, and the locking nut 3 is arranged outside the valve conduit 2, and is characterized in that it also includes a sealing nut 5 arranged at the interface of the valve conduit 2, the sealing nut 5 is provided with a groove 6, the interface of the valve conduit 2 is provided with a raised ring 7 corresponding to the groove 6, the raised ring 7 and the pipeline 1 enclose a sealing groove 8, and the sealing nut 5 is sealed in the sealing groove 8 by deformation.

[0028] After the pipe 1 and the valve guide 2 and the locking nut 3 are installed, screw the sealing nut 5 to Figure 2 In the position shown, adjust the groove 6 to completely correspond to the raised ring 7, continue to screw the sealing nut 5 until the groove 6 and the raised ring 7 are mortise-jointed, and continue to screw until the sealing nut 5 is deformed. The sealing nut 5 is deformed by the force generated by the locking of the sealing nut 5, the interaction force between the groove 6 and the raised ring 7, and the extrusion force generated by the sealing nut 5 and the pipeline 1, and sealing is achieved when the end face position is stable.

[0029] like Figure 5 As shown, the sealing nut 5 includes a nut body 51, a lip plate 52, and a groove 6 formed by the nut body 51 and the lip plate 52. The nut body 51 is connected to the outer wall of the valve guide 2, the groove 6 is mortise-jointed with the raised ring 7, and the lip plate 52 cooperates with the sealing groove 8.

[0030] The nut body 51 and the outer wall of the valve guide 2 can be threaded, which is not shown in the figure. The side of the lip plate 52 that connects with the pipe 1 can be an inclined surface or a conical surface. The end face of the sealing nut 5 is a horizontal surface, which is more suitable for production and installation.

[0031] like Figure 6 As shown, the raised ring 7 is arranged at the interface of the valve guide tube 2, and the cross section of the raised ring 7 is a convex shape, including a sealing groove bottom surface 71, a sealing groove raised ring side surface 72, a raised surface 73, a raised ring outer side surface 74 and a raised ring outer bottom surface 75. The sealing groove raised ring side surface 72 is inclined toward the raised ring outer side surface 74, the raised surface 73 is an inclined surface, and the sealing groove bottom surface 71 is a horizontal surface.

[0032] Those skilled in the art should understand that the side surface 72 of the raised ring of the sealing groove is inclined toward the outer side surface 74 of the raised ring, that is, the sealing groove gradually narrows from the groove opening to the groove bottom, which not only further ensures the sealing effect, but also facilitates practical operation. The raised surface 73 is an inclined surface rather than a horizontal surface, and the corresponding groove bottom of the groove 6 is not parallel to the end surface of the sealing nut 5. When the groove 6 is fixed with the raised ring 7 by mortise and tenon, a non-horizontal force can be generated, which is more conducive to the deformation of the lip plate 52. By setting the bottom surface 71 of the sealing groove as a horizontal surface for positioning, the actual sealing effect can also be guaranteed.

[0033] like Figure 2-4 As shown, the groove 6 includes a groove bottom surface 61, a groove lip plate side surface 62 and a groove nut body side surface 63. The groove lip plate side surface 62 and the groove nut body side surface 63 are both inclined toward the nut body 51, and the groove bottom surface 61 cooperates with the raised surface 73.

[0034] Furthermore, a thread is provided on one side of the lip plate 52 connected to the pipe 1, and a chamfer is provided on the end of the lip plate 52 away from the sealing groove 8. Because the deformation of the lip plate 52 is the largest, in order to prevent excessive deformation of the sealing nut 5, and taking into account the manufacturing cost and actual production needs, the length of the lip plate 52 is not more than half of the length of the sealing nut 5.

[0035] like Figure 3 As shown, the sealing groove 8 also includes a deformation groove 81, which is formed by the inclined surface formed by the valve guide 2 constituting the bottom of the sealing groove 8 tilting in a direction away from the pipeline 1 and the pipeline 1, and the inclination angle of the inclined surface of the valve guide 2 does not exceed 10°. Those skilled in the art should understand that the sealing nut 5, especially the lip plate 52, is deformed by forces in multiple directions, and the contact surface between the lip plate 52 and the bottom surface 71 of the sealing groove may be deformed into a non-horizontal surface, so the deformation groove 81 is provided. It is also more conducive to achieving a good sealing effect.

[0036] Furthermore, if Figure 5 As shown, in order to achieve a better tenon-joint effect between the groove 6 and the raised ring 7 and a better positioning effect, the raised surface 73 is inclined toward the outer wall of the valve conduit 2, rather than the pipe. The outer side surface 74 of the raised ring is a vertical surface, and the outer bottom surface 75 of the raised ring is an inclined surface, which is inclined toward the outer wall of the valve conduit 2.

[0037] like Figure 2-4 As shown, the pipeline 1 is provided with a fastening ring 11 for installing the sealing nut 5, and a slide groove 111 is provided on one side of the fastening ring 11 close to the sealing groove 8. Providing the positioning groove makes it more convenient to install the sealing nut 5, and the slide groove 111 is not only more conducive to the installation of the sealing nut 5, but also conducive to the positioning of the sealing nut 5.

[0038] Furthermore, if Figure 3-4 As shown, it also includes a sealing gasket 4, which seals the pipeline 1 and the valve conduit 2. The sealing gasket 4 is arranged at a port at one end of the pipeline 1 and the valve conduit 2. After the installation is completed, the sealing nut 5 is fitted with the end face of the locking nut 3 at the end away from the pipeline 1.

[0039] The valve conduit 2 may be provided with a groove, and the sealing gasket 4 may be provided in the groove. In this embodiment, the sealing effect may be further improved by providing the sealing gasket 4. In this embodiment, the locking nut 3 may be installed after the sealing nut 5 is installed. The interaction force between the sealing nut 5 and the locking nut 3 is more conducive to the sealing and positioning of the sealing nut assembly. Furthermore, when there is a gap between the sealing gasket 4 and the pipeline 1 and sealing is not achieved, a wrench or other tool may be used to twist 11 so that the sealing gasket 4 is sealed with the pipeline 1 to further prevent leakage.

[0040] Those skilled in the art should understand that the sealing nut (5) is integrally formed, and the material hardness of the sealing nut (5) is less than the material hardness of the pipe (1) and the valve conduit (2). This ensures that when the interaction force is generated, it is the sealing nut 5 that is deformed instead of the pipe 1 and the valve conduit 2. The sealing nut 5 can be made of steel or alloy, such as brass, bronze or other materials, according to actual production needs.

[0041] The working principle of the present invention is: after the pipeline 1, the valve guide tube 2, the locking nut 3 and the sealing gasket 4 are installed, the sealing nut 5 is first screwed into the valve guide tube 2 through the slide groove 111 of the fastening ring 11. Figure 2-4 When the nut 51 is in the position, the position is checked and adjusted to ensure that the positions of the groove 6 and the raised ring 7 correspond one to one. After the inspection is completed, continue to tighten until the nut body 51 is threadedly connected to the outer wall of the valve guide 2. At this time, the sealing nut 5 and the end away from the pipe 1 are in contact with the end face of the locking nut 3, and the lip plate 52 reaches the bottom surface 71 of the sealing groove. Then, a certain force is applied from the end face of the sealing nut 5 until the groove 6 and the raised ring 7 are mortised. At the same time, the lip plate 52 is deformed by multiple effects, and the sealing groove 8 is completely sealed, that is, the side of the lip plate 52 connected to the pipe 1 is sealed due to the thread variation, and the side 62 of the groove lip plate and the side 72 of the raised ring of the sealing groove are further sealed under the condition of mortise sealing. The lip plate 52 seals the deformation groove 81 due to deformation. The sealing nut assembly is sealed. The installation process of the present invention is not limited to the above steps and sequence, and can be adjusted according to actual needs.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although the terms such as pipeline 1, valve guide tube 2, locking nut 3, sealing gasket 4, sealing nut 5, groove 6, raised ring 7, sealing groove 8, nut body 51, lip plate 52, sealing groove bottom surface 71, sealing groove raised ring side surface 72, raised surface 73, raised ring outer side surface 74, raised ring outer bottom surface 75, groove bottom surface 61, groove lip plate side surface 62, groove nut body side surface 63, the groove lip plate side surface 62, groove nut body side surface 63, deformation groove 81, fastening ring 11, sliding groove 111 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention, and interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A sealing nut assembly, comprising a pipe (1), a valve conduit (2) and a locking nut (3), wherein one end of the pipe (1) is plugged into the interior of the valve conduit (2), and the locking nut (3) is arranged outside the valve conduit (2), characterized in that: It also includes a sealing nut (5) arranged at the interface of the valve conduit (2), the sealing nut (5) being provided with a groove (6), the interface of the valve conduit (2) being provided with a raised ring (7) corresponding to the groove (6), the raised ring (7) and the pipeline (1) enclosing a sealing groove (8), and the sealing nut (5) being sealed in the sealing groove (8) by deformation; The sealing nut (5) comprises a nut body (51), a lip plate (52), and a groove (6) formed by the nut body (51) and the lip plate (52); the nut body (51) is connected to the outer wall of the valve guide tube (2); the groove (6) is mortise-jointed with the raised ring (7); the lip plate (52) is matched with the sealing groove (8); and a thread is arranged on a side of the lip plate (52) connected to the pipe (1); The raised ring (7) is arranged at the interface of the valve guide tube (2). The cross section of the raised ring (7) is a convex shape, including a sealing groove bottom surface (71), a sealing groove raised ring side surface (72), a raised surface (73), a raised ring outer side surface (74) and a raised ring outer bottom surface (75). The sealing groove raised ring side surface (72) is inclined toward the raised ring outer side surface (74), the raised surface (73) is an inclined surface, and the sealing groove bottom surface (71) is a horizontal surface. The raised surface (73) is inclined toward the outer wall of the valve conduit (2), the outer side surface (74) of the raised ring is a vertical surface, and the outer bottom surface (75) of the raised ring is an inclined surface, which is inclined toward the outer wall of the valve conduit (2).

2. A sealing nut assembly according to claim 1, characterized in that: The groove (6) comprises a groove bottom surface (61), a groove lip plate side surface (62) and a groove nut body side surface (63); the groove lip plate side surface (62) and the groove nut body side surface (63) are both inclined toward the nut body (51); and the groove bottom surface (61) matches the raised surface (73).

3. A sealing nut assembly according to claim 2, characterized in that: A chamfer is provided at one end of the lip plate (52) away from the sealing groove (8), and the length of the lip plate (52) is no greater than half the length of the sealing nut (5).

4. A sealing nut assembly according to claim 1, characterized in that: The sealing groove (8) further comprises a deformation groove (81), wherein the deformation groove (81) is formed by an inclined surface formed by the valve conduit (2) constituting the bottom of the sealing groove (8) tilting in a direction away from the pipeline (1) and the pipeline (1), and the inclination angle of the inclined surface of the valve conduit (2) does not exceed 10°.

5. A sealing nut assembly according to claim 1, characterized in that: The pipeline (1) is provided with a fastening ring (11) for installing the sealing nut (5), and a sliding groove (111) is provided on a side of the fastening ring (11) close to the sealing groove (8).

6. A sealing nut assembly according to claim 1, characterized in that: It also includes a sealing gasket (4), the sealing gasket (4) sealing the pipeline (1) and the valve conduit (2), the sealing gasket (4) being arranged at a port at one end of the pipeline (1) and the valve conduit (2), and the sealing nut (5) after installation is completed, the end away from the pipeline (1) is in contact with the end face of the locking nut (3).

7. A sealing nut (5) assembly according to any one of claims 1 to 6, characterized in that: The sealing nut (5) is integrally formed, and the material hardness of the sealing nut (5) is smaller than the material hardness of the pipeline (1) and the valve conduit (2).

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