Wear-resistant packing sealing structure

Abstract

The utility model discloses a wear-resistant packing sealing structure, which relates to the technical field of ball valve packing sealing structures, and comprises a valve body and a valve rod, a bearing and a sealing ring which are in sealing connection are arranged between the bottom of the valve rod and the valve body, and the sealing ring is positioned above the bearing; a multi-sealing structure is arranged between the middle of the valve rod and the valve body, a pressing plate is arranged at the top end of the multi-sealing structure, a compressed belleville spring is arranged between the pressing plate and the multi-sealing structure, and the pressing plate is fixedly connected with the valve body through a bolt assembly. The multi-sealing structure comprises a filler, a filler pressing sleeve and a shaft sleeve, and the upper end of the filler pressing sleeve is tightly matched with the belleville spring in an abutting mode. The packing is of a multi-layer wedge-shaped structure and is even in stress, high in rebound coefficient and good in sealing performance. The shaft sleeve can reduce friction in the rapid rotation process of the valve rod, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of ball valve packing sealing structure, and in particular to a wear-resistant packing sealing structure. Background Technology

[0002] The sealing structure at the stem of a ball valve is usually a double seal consisting of packing and an O-ring. The sealing structure is simple, but the stem needs to rotate frequently, which can easily lead to wear or even seal failure. Utility Model Content

[0003] The purpose of this invention is to provide a wear-resistant packing sealing structure to solve the problem of poor sealing effect of conventional two-layer sealing structures of packing and O-ring mentioned in the background art.

[0004] The present invention adopts the following technical solution:

[0005] This utility model discloses a wear-resistant packing sealing structure, including a valve body, a valve stem disposed inside the valve body, and a bearing and a sealing ring disposed between the bottom of the valve stem and the valve body, with the sealing ring located above the bearing;

[0006] A multi-seal structure is provided between the middle part of the valve stem and the valve body. The upper end of the multi-seal structure extends to the outside of the valve body. A pressure plate is provided at the top of the multi-seal structure. A compressed butterfly spring is provided between the pressure plate and the multi-seal structure. The pressure plate and the valve body are fixedly connected by a bolt assembly.

[0007] The multiple sealing structure includes packing material, which is tightly filled between the valve stem and the valve body. A packing sleeve is provided at the upper end of the packing material, and a bushing is provided between the packing sleeve and the valve stem. The upper end of the packing sleeve is in close contact with the disc spring.

[0008] Furthermore, an annular boss is provided at the bottom of the valve stem, and the inner ring of the bearing abuts against the annular boss;

[0009] The outer ring of the bearing has a first stepped surface that is away from the annular boss. The first stepped surface and a second stepped surface are in close contact and fit together. The second stepped surface is disposed on the valve body.

[0010] Furthermore, the valve stem is provided with a groove, and the sealing ring is disposed in the groove.

[0011] Furthermore, the filler has a multi-layered wedge-shaped structure.

[0012] Furthermore, the packing sleeve is a T-shaped sleeve structure, with a sleeve provided on the packing sleeve, and a bushing provided between the sleeve and the valve stem.

[0013] Furthermore, the disc spring is configured with multiple overlapping structures.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0015] This invention features a multi-layer sealing structure, in which the packing is a multi-layer wedge-shaped structure, which provides uniform stress, good flexibility, high resilience, and excellent sealing performance. A bushing is installed inside the packing sleeve to reduce friction and valve torque during rapid valve stem rotation, thereby extending the valve stem's service life. The butterfly spring is pre-compressed to compensate for minor leaks in the valve stem, ensuring a durable seal from the packing. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the wear-resistant filler sealing structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the multiple sealing structure in the wear-resistant packing sealing structure of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Valve stem; 1-1. Annular boss; 1-2. Groove; 2. Bearing; 2-1. First step surface; 3. Sealing ring; 4. Multiple sealing structure; 4-1. Packing; 4-2. Packing sleeve; 4-2-1. Sleeve; 4-3. Shaft sleeve; 5. Butterfly spring; 6. Pressure plate; 7. Valve body; 7-1. Second step surface; 8. Bolt assembly. Detailed Implementation

[0020] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, this embodiment discloses a wear-resistant packing sealing structure, including a valve body 7, a valve stem 1 is provided inside the valve body 7, and a bearing 2 and a sealing ring 3 are provided between the bottom of the valve stem 1 and the valve body 7 for sealing connection, with the sealing ring 3 located above the bearing 2.

[0022] In this embodiment, the sealing ring 3 is an O-ring.

[0023] A multi-seal structure 4 is provided between the middle of the valve stem 1 and the valve body 7. The upper end of the multi-seal structure 4 extends to the outside of the valve body 7. A pressure plate 6 is provided at the top of the multi-seal structure 4. A compressed butterfly spring 5 is provided between the pressure plate 6 and the multi-seal structure 4. The pressure plate 6 and the valve body 7 are fixedly connected by a bolt assembly 8.

[0024] like Figure 2 As shown, the multi-seal structure 4 includes packing 4-1, which is tightly filled between the valve stem 1 and the valve body 7. A packing sleeve 4-2 is provided at the upper end of the packing 4-1, which presses the packing 4-1 tightly. A bushing 4-3 is provided between the packing sleeve 4-2 and the valve stem 1, which protects the valve stem 1 from wear. The upper end of the packing sleeve 4-2 is in close contact with the butterfly spring 5. The packing sleeve 4-2 is a T-shaped sleeve structure, with a sleeve 4-2-1 on it, and the bushing 4-3 is located between the sleeve 4-2-1 and the valve stem 1.

[0025] In this embodiment, the butterfly spring 5 is configured as multiple overlapping structures, wherein two butterfly springs 5 ​​are arranged in a paired combination. When the valve stem 1 experiences slight leakage, the butterfly springs 5 ​​can provide compensation.

[0026] In this embodiment, an annular boss 1-1 is provided at the bottom of the valve stem 1, and the inner ring of the bearing 2 abuts against the annular boss 1-1. The bearing 2 is a single-flange bearing, and the outer wall of the outer ring of the bearing 2 has a first stepped surface 2-1 facing away from the annular boss 1-1. The first stepped surface 2-1 and a second stepped surface 7-1 are in close contact and fit together. The second stepped surface 7-1 is located on the valve body 7. The bearing 2 serves to lubricate and seal the valve stem 1 during rotation. In this embodiment, the bearing 2 is a sealed bearing made of RPTFE material.

[0027] In this embodiment, the valve stem 1 is provided with a groove 1-2, and the sealing ring 3 is disposed in the groove 1-2.

[0028] In this embodiment, the packing 4-1 has a multi-layer wedge structure. Specifically, the packing 4-1 is composed of multiple packing layers with a cross-section that is wider inside and narrower outside, and packing layers with a cross-section that is narrower inside and wider outside, stacked in sequence. This design structure results in more uniform stress distribution and better sealing performance.

[0029] In this embodiment, the installation process of this utility model is as follows:

[0030] First, during installation, the bearing 2 and sealing ring 3 are first fitted onto the valve stem 1 inside the valve body 7 to provide a seal between the valve stem 1 and the valve body 7. Then, the packing 4-1 is installed and tightened. Next, the bushing 4-3 is installed inside the sleeve 4-2-1 of the packing sleeve 4-2. Then, the bushing 4-3 and the packing sleeve 4-2 are fitted onto the valve stem 1 together, ensuring that the upper part of the bushing 4-3 and the packing sleeve 4-2 protrudes to the outside of the valve body 7. Then, the butterfly spring 5, which is arranged in a mating combination, is installed on the valve stem 1 and pressed tightly onto the packing sleeve 4-2. Finally, the pressure plate 6 is placed on top of the butterfly spring 5, and the pressure plate 6 is tightly connected to the valve body 7 by the bolt assembly 8.

[0031] The packing 4-1 in this invention has a multi-layer wedge structure, which provides uniform stress, good flexibility, high resilience, and excellent sealing performance, effectively ensuring that the sealing part of the valve stem 1 will not leak. The bushing 4-3 inside the packing sleeve 4-2 can reduce friction and valve torque during rapid rotation of the valve stem 1, thus extending the service life of the valve stem 1. The butterfly spring 5 is pre-compressed and can compensate for minor leaks in the valve stem 1, ensuring the long-lasting seal of the packing 4-1.

[0032] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A wear-resistant packing seal structure, comprising a valve body (7), wherein a valve stem (1) is disposed within the valve body (7), characterized in that: A bearing (2) and a sealing ring (3) are provided between the bottom of the valve stem (1) and the valve body (7) for sealing connection, and the sealing ring (3) is located above the bearing (2); A multi-seal structure (4) is provided between the middle part of the valve stem (1) and the valve body (7). The upper end of the multi-seal structure (4) extends to the outside of the valve body (7). A pressure plate (6) is provided at the top of the multi-seal structure (4). A compressed butterfly spring (5) is provided between the pressure plate (6) and the multi-seal structure (4). The pressure plate (6) and the valve body (7) are fixedly connected by a bolt assembly (8). The multiple sealing structure (4) includes a packing (4-1), which is tightly filled between the valve stem (1) and the valve body (7). A packing sleeve (4-2) is provided at the upper end of the packing (4-1), and a bushing (4-3) is provided between the packing sleeve (4-2) and the valve stem (1). The upper end of the packing sleeve (4-2) is in close contact with the butterfly spring (5).

2. The wear-resistant packing sealing structure according to claim 1, characterized in that: The valve stem (1) is provided with an annular boss (1-1) at the bottom, and the inner ring of the bearing (2) abuts against the annular boss (1-1); The outer ring of the bearing (2) has a first step surface (2-1) that is away from the annular boss (1-1). The first step surface (2-1) and the second step surface (7-1) are in close contact and fit together. The second step surface (7-1) is disposed on the valve body (7).

3. The wear-resistant packing sealing structure according to claim 1, characterized in that: The valve stem (1) is provided with a groove (1-2), and the sealing ring (3) is disposed in the groove (1-2).

4. The wear-resistant packing sealing structure according to claim 1, characterized in that: The filler (4-1) has a multi-layered wedge structure.

5. The wear-resistant packing sealing structure according to claim 1, characterized in that: The packing sleeve (4-2) is a T-shaped sleeve structure. A sleeve (4-2-1) is provided on the packing sleeve (4-2). A bushing (4-3) is provided between the sleeve (4-2-1) and the valve stem (1).

6. The wear-resistant packing sealing structure according to claim 1, characterized in that: The butterfly spring (5) is configured with multiple overlapping structures.

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