A type of PVC pipe fitting

Abstract

This utility model provides a PVC pipe fitting, belonging to the field of sealing ring technology. It solves the problem of easy failure of sealing rings in existing PVC pipe fittings during use. This PVC pipe fitting includes a pipe body with a sealing groove and a sealing ring embedded in the sealing groove. A rigid support ring is fixedly connected to the sealing ring. The rigid support ring has an inverted U-shaped cross-section and is fitted onto the edge of the pipe body. The inner diameter of the rigid support ring is smaller than the inner diameter of the sealing ring. The inner wall of the sealing ring also has a sealing lip, the inner diameter of which is smaller than the inner diameter of the rigid support ring. This utility model has the advantage of solving the problem of easy failure of sealing rings in existing PVC pipe fittings during use.

Description

Technical Field

[0001] This utility model belongs to the field of sealing ring technology and relates to a PVC pipe fitting connector. Background Technology

[0002] With the widespread use of plastic pipes, the types of pipe fittings are also increasing. For example, Chinese patent literature discloses an elastic sealing ring type pipe fitting (authorization announcement number: CN201651641U), including a fitting body with a flared fitting. The flared fitting has a sealing groove along its rim, and a sealing ring is located within the groove. The inner diameter of the sealing ring is smaller than the inner diameter of the flared fitting's rim. The characteristic of this elastic sealing ring type pipe fitting is that the flared fitting has a sealing groove along its rim, and a sealing ring is located within the groove. During connection, the plastic pipe is forcefully inserted into the flared fitting. Because the inner diameter of the sealing ring is smaller than the inner diameter of the flared fitting's rim, while the outer diameter of the plastic pipe is approximately equal to the inner diameter of the flared fitting's rim, the sealing ring and the plastic pipe have an interference fit, achieving a good sealing effect. The sealing ring is used to fasten the plastic pipe instead of glue. Installation is simple; just insert the plastic pipe into the flared fitting. Therefore, the operation is quite simple. Furthermore, because the sealing ring is elastic, the elongation or shortening of the plastic pipe during use will not affect its sealing effect.

[0003] The elastic sealing ring type pipe fitting has the following shortcomings during use: Although the sealing ring connection is relatively convenient, in order to ensure the sealing performance, the compression of the sealing ring needs to be guaranteed. This will result in a large radial pressure on the pipe during insertion, that is, the friction force when the pipe is inserted will increase. At the same time, due to the friction force, the sealing ring will curl along the pipe insertion direction, which will further increase the contact area between the sealing ring and the pipe, thus further increasing the friction force when the pipe is inserted. In severe cases, the sealing ring will be squeezed out of the sealing groove area along the pipe socket direction, resulting in sealing failure. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a PVC pipe fitting connector. The technical problem this invention aims to solve is how to address the issue of the sealing ring in existing PVC pipe fitting connectors easily failing during use.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A PVC pipe fitting includes a pipe body with a sealing groove and a sealing ring embedded in the sealing groove. The sealing ring is characterized by having a rigid support ring fixedly connected to it. The rigid support ring has an inverted U-shaped cross-section and is fitted onto the edge of the pipe body. The inner diameter of the rigid support ring is smaller than the inner diameter of the sealing ring. The inner wall of the sealing ring also has a sealing lip, the inner diameter of which is smaller than the inner diameter of the rigid support ring.

[0007] In use, simply insert the plastic pipe into the fitting body until an interference fit is formed between the sealing lip of the sealing ring and the outer wall of the plastic pipe. This PVC pipe fitting connector uses a rigid support ring with an inverted U-shaped cross-section fixed to the sealing ring and fitted onto the edge of the fitting body. The rigid support ring provides circumferential support to the sealing ring, preventing it from deforming radially along the fitting body. This keeps the compression of the sealing ring stable during insertion and eliminates local gaps, improving the sealing effect. At the same time, the inverted U-shaped cross-section of the rigid support ring fitted onto the edge of the fitting body prevents the sealing groove from deforming elliptically. It also inhibits excessive curling deformation of the sealing ring along the axial direction of the fitting body when the plastic pipe is inserted, preventing the sealing ring from being squeezed out of the sealing groove. This solves the problem of sealing ring failure in existing PVC pipe fitting connectors during use.

[0008] In the aforementioned PVC pipe fitting, the connection between the rigid support ring and the sealing ring has an inverted L-shaped first step, which abuts against the top wall and inner side wall of the sealing ring. During insertion, the plastic pipe first contacts the rigid support ring, while the rigid support ring provides circumferential support to the sealing ring, preventing the sealing ring from deforming radially along the pipe body.

[0009] In the aforementioned PVC pipe fitting, the top of the sealing ring has an L-shaped second step, which abuts against the inner wall of the pipe fitting body and the upper wall of the sealing groove. This positions the top of the sealing ring between the pipe fitting body and the rigid support ring, providing better circumferential support and further preventing radial deformation of the sealing ring along the pipe fitting body. It also eliminates local gaps, preventing the sealing ring from being squeezed out of the sealing groove and failing.

[0010] In one of the PVC pipe fittings described above, the outer wall of the sealing ring has an annular groove. This annular groove increases the torsional stiffness of the sealing ring, strengthens its resistance to compressive deformation, and ensures that the compression of the sealing ring remains stable during insertion, thereby improving the sealing effect.

[0011] In the aforementioned PVC pipe fitting, the sealing lip is inclined from the outside inwards and from top to bottom. This ensures a good seal between the sealing ring and the plastic pipe while reducing friction during pipe insertion.

[0012] Compared with existing technologies, the advantages of this PVC pipe fitting are as follows: This PVC pipe fitting uses a rigid support ring with an inverted U-shaped cross-section fixed to the sealing ring and fitted onto the edge of the pipe body. The rigid support ring provides circumferential support to the sealing ring, preventing it from deforming radially along the pipe body. This keeps the compression of the sealing ring stable during insertion and eliminates local gaps, improving the sealing effect. Simultaneously, the inverted U-shaped cross-section of the rigid support ring, fitted onto the edge of the pipe body, prevents elliptic deformation of the sealing groove and inhibits excessive curling deformation of the sealing ring along the axial direction of the pipe body when the plastic pipe is inserted, preventing the sealing ring from being squeezed out of the sealing groove. This solves the problem of sealing ring failure in existing PVC pipe fittings during use. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the PVC pipe fitting.

[0014] Figure 2 This is a cross-sectional view of the PVC pipe fitting.

[0015] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0016] Figure 4 This is a three-dimensional structural diagram of a sealing ring with a rigid support ring connected to a PVC pipe fitting.

[0017] Figure 5 This is a schematic diagram of the structure of this PVC pipe fitting when the pipe is just inserted into the fitting body.

[0018] In the figure, 1 is the pipe body; 1a is the sealing groove; 2 is the sealing ring; 2a is the second step; 2b is the annular groove; 2c is the sealing lip; 3 is the rigid support ring; 3a is the first step; and 4 is the plastic pipe. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] A PVC pipe fitting, as shown in the reference Figure 1-5The device includes a pipe body 1 with a sealing groove 1a and a sealing ring 2 embedded in the sealing groove 1a. The sealing ring 2 is characterized by having a rigid support ring 3 fixedly connected to it. The rigid support ring 3 has an inverted U-shaped cross-section and is fitted onto the edge of the pipe body 1. The inner diameter of the rigid support ring 3 is smaller than the inner diameter of the sealing ring 2. The inner wall of the sealing ring 2 also has a sealing lip 2c, the inner diameter of which is smaller than the inner diameter of the rigid support ring 3.

[0021] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 Specifically, the connection between the rigid support ring 3 and the sealing ring 2 has an inverted L-shaped first step 3a, which is abutted against the top wall and inner side wall of the sealing ring 2 respectively; the top of the sealing ring 2 has an L-shaped second step 2a, which is abutted against the inner side wall of the pipe body 1 and the upper side wall of the sealing groove 1a respectively; the outer side wall of the sealing ring 2 has an annular groove 2b; and the sealing lip 2c is inclined from the outside to the inside from top to bottom.

[0022] In this embodiment, the rigid support ring 3 is preferably made of metal, the sealing ring 2 is made of rubber, and the rigid support ring 3 and the sealing ring 2 are fixed together by vulcanization bonding.

[0023] The working principle of this PVC pipe fitting is explained below:

[0024] Reference Figure 5 In use, simply insert the plastic pipe 4 into the fitting body 1. During the insertion process, the plastic pipe 4 first contacts the rigid support ring 3. At the same time, the rigid support ring 3 provides circumferential support for the sealing ring 2, preventing the sealing ring 2 from deforming radially along the fitting body 1 and eliminating local gaps. This prevents the sealing ring 2 from being squeezed out of the sealing groove 1a. The annular groove 2b can increase the torsional hardness of the sealing ring 2 and strengthen its resistance to compression deformation, so that the compression of the sealing ring 2 remains stable during the insertion process, improving the sealing effect. Meanwhile, the cross-section of the rigid support ring 3 is U-shaped and is fitted on the edge of the fitting body 1, which can prevent the sealing groove 1a from deforming elliptically. It can also suppress the excessive curling deformation of the sealing ring 2 along the axial direction of the fitting body 1 when the plastic pipe 4 is inserted, reducing the radial compression of the sealing ring 1 and the contact area with the plastic pipe 4, thereby reducing the friction when the plastic pipe 4 is inserted.

[0025] After the plastic pipe 4 is inserted into place, the sealing ring 3 and the outer wall of the plastic pipe 4 form an interference fit, thereby achieving a better sealing effect. Moreover, during use, the plastic pipe 4 will not affect the sealing effect between the plastic pipe 4 and the sealing ring 2 due to thermal expansion and contraction.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A PVC pipe fitting connector, comprising a pipe body (1) having a sealing groove (1a) and a sealing ring (2) embedded in the sealing groove (1a), characterized in that, A rigid support ring (3) is fixedly connected to the sealing ring (2). The cross-section of the rigid support ring (3) is U-shaped and is fitted onto the edge of the pipe body (1). The inner diameter of the rigid support ring (3) is smaller than the inner diameter of the sealing ring (2). The inner wall of the sealing ring (2) also has a sealing lip (2c). The inner diameter of the sealing lip (2c) is smaller than the inner diameter of the rigid support ring (3).

2. A PVC pipe fitting according to claim 1, characterized in that, The connection between the rigid support ring (3) and the sealing ring (2) has an inverted L-shaped first step (3a), which is respectively abutted against the top wall and the inner side wall of the sealing ring (2).

3. A PVC pipe fitting according to claim 2, characterized in that, The top of the sealing ring (2) has an L-shaped second step (2a), which is respectively abutted against the inner side wall of the pipe body (1) and the upper side wall of the sealing groove (1a).

4. A PVC pipe fitting according to claim 1, 2, or 3, characterized in that, The outer wall of the sealing ring (2) has an annular groove (2b).

5. A PVC pipe fitting according to claim 1, 2, or 3, characterized in that, The sealing lip (2c) is inclined from the outside to the inside and from top to bottom.

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