Fluorine-lined ball valve with good sealing performance

Abstract

According to the technical scheme, the fluorine lining ball valve is characterized by comprising a valve body, a ball body, a valve rod, padding, a padding gland, an inner sealing ring and an outer sealing ring, and the inner wall and the outer wall of the padding gland are provided with an inner sealing groove and an outer sealing groove respectively. An inner pressing ring groove and an outer pressing ring groove which are coaxial with the packing gland are formed in the inner wall and the outer wall of the packing gland correspondingly, the two ends, distributed in the axis direction of the packing gland, of the inner pressing ring groove extend to the end face, facing the packing, of the packing gland and the position of the inner sealing groove correspondingly, and the diameter of the inner pressing ring groove is smaller than or equal to that of the inner sealing groove. The two ends, distributed in the axis direction of the packing gland, of the outer pressing ring groove extend to the end face, facing the packing, of the packing gland and the position of the outer sealing groove correspondingly, the diameter of the outer pressing ring groove is larger than or equal to that of the outer sealing groove, and the end, facing the packing, of the packing gland is provided with a pressing ring with the U-shaped section, and the two ends of the pressing ring extend into the inner pressing ring groove and the outer pressing ring groove correspondingly. The problems that in the prior art, the sealing effect is poor, and leakage is prone to occurring are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve technical field more specifically relates to a fluorine lining ball valve with good sealing performance. BACKGROUND

[0002] The structure principle of ball valve is to take the ball with circular through hole as the opening and closing part, and the ball rotates around the center line of valve body with the valve rod to realize the opening and closing of valve. In the occasion of conveying corrosive fluid medium such as heavy chemical industry, large chemical fertilizer, petroleum and petrochemical, steel smelting, metal valve can be corroded, obviously cannot be used, therefore, in this kind of occasion, it is usually necessary to use corrosion-resistant plastic fluorine lining valve.

[0003] The existing fluorine lining ball valve includes a valve body, a ball located in the valve body, a valve rod driving the ball to rotate, a packing located in the valve body and closely attached to the valve rod, and a packing gland for pressing the packing down. Because the packing is easily lost during use, it can cause medium leakage. The existing Chinese patent with publication number CN115807858A discloses a low-flow-rate anti-wear ball valve, which adds O-rings on the inner wall and outer wall of the packing gland to form a seal between the packing gland and the valve body. Although this solves the problem of leakage after packing loss to some extent, it still has defects. The O-rings on the inner wall and outer wall of the packing gland are elastic, so the inner diameter of the O-ring on the inner wall of the packing gland in the natural state is greater than the diameter of the valve rod, causing the O-ring to fail to form an effective seal with the outer wall of the valve rod. The O-ring on the outer wall of the packing gland is contracted towards the position of the packing gland axis, causing the O-ring to fail to form an effective seal with the inner wall of the valve body. Both of the above situations can cause easy leakage of medium. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a fluorine lining ball valve with good sealing effect and stability.

[0005] To achieve the above object, the utility model provides the following technical scheme: A fluorine lining ball valve that good sealing performance, including valve body, the ball body in the valve body, the valve stem connected with the ball body, the packing in the valve stem outside, the packing gland for packing compression, the inner sealing ring and the outer sealing ring on the inner wall and the outer wall of packing gland respectively, the inner wall and the outer wall of packing gland are provided with the inner sealing groove and the outer sealing groove respectively for the accommodation of inner sealing ring and outer sealing ring, the inner wall and the outer wall of packing gland are provided with the inner compression ring groove and the outer compression ring groove respectively with the coaxial packing gland, the both ends of inner compression ring groove along the axial direction of packing gland respectively extend to the end face of packing gland towards packing and inner sealing groove, the diameter of inner compression ring groove is less than or equal to the diameter of inner sealing groove, the both ends of outer compression ring groove along the axial direction of packing gland respectively extend to the end face of packing gland towards packing and outer sealing groove, the diameter of outer compression ring groove is greater than or equal to the diameter of outer sealing groove, the end of packing gland towards packing is provided with the compression ring that the section is U type and two ends respectively extend into inner compression ring groove and outer compression ring groove, and the inner sealing ring and the outer sealing ring are extruded by compression ring to make the elastic deformation of inner sealing ring and outer sealing ring and respectively with the outer wall of valve stem and the inner wall of valve body.

[0006] As the further improvement of the utility model, the elastic connecting piece is arranged between the compression ring and the packing gland.

[0007] As the further improvement of the utility model, the end face of the compression ring and the packing is inclined to the horizontal plane.

[0008] As the further improvement of the utility model, the hook groove is arranged on the face opposite to the outer compression ring groove or on the face opposite to the inner compression ring groove.

[0009] The utility model discloses the beneficial effects: the inner sealing ring and the outer sealing ring are extruded by compression ring to make the elastic deformation of inner sealing ring and outer sealing ring and respectively with the outer wall of valve stem and the inner wall of valve body, and such design can extrude the inner sealing ring and the outer sealing ring near packing and force the inner sealing ring and the outer sealing ring to form effective soft seal with valve stem and valve body compared with prior art, effectively avoid the medium leakage, improve the connection stability of packing gland and valve body simultaneously, in the process of dismounting, the inner sealing ring and the outer sealing ring are all in the relaxed state between valve stem and valve body and between valve body and valve body, and the dismounting operation of packing gland is convenient to valve body, and the dismounting efficiency is improved. ACCURACY OF DRAWINGS

[0010] Figure 1 It is the front view of the utility model;

[0011] Figure 2 It is Figure 1 It is the enlarged view of A in the middle;

[0012] Figure 3 It isFigure 2 The state diagram after the medium pressure ring extrudes the inner sealing ring and the outer sealing ring.

[0013] Reference signs: 1, valve body; 2, ball; 3, valve stem; 4, packing; 5, packing gland; 51, inner sealing groove; 52, outer sealing groove; 53, inner pressure ring groove; 54, outer pressure ring groove; 6, inner sealing ring; 7, outer sealing ring; 8, pressure ring; 81, hook groove; 9, elastic connecting piece. DETAILED DESCRIPTION

[0014] The utility model will be further explained in detail below in combination with the drawings and examples. Identical parts are indicated by identical reference signs.

[0015] Referring to Figures 1 to 3 The ball valve with good sealing performance of the embodiment includes a valve body 1, a ball 2 located in the valve body 1, a valve stem 3 connected with the ball 2, a packing 4 located outside the valve stem 3, a packing gland 5 for compressing the packing 4, an inner sealing ring 6 and an outer sealing ring 7 respectively located on the inner wall and the outer wall of the packing gland 5, and the inner wall and the outer wall of the packing gland 5 are respectively provided with an inner sealing groove 51 and an outer sealing groove 52 for accommodating the inner sealing ring 6 and the outer sealing ring 7.

[0016] Based on the foregoing prior art, the inner pressure ring groove 53 and the outer pressure ring groove 54 are machined by milling on the inner wall and the outer wall of the packing gland 5, the two ends of the inner pressure ring groove 53 respectively extend to the end face of the packing gland 5 and the inner sealing groove 51, the circumference diameter surrounded by the groove bottom of the inner pressure ring groove 53 is less than or equal to the circumference diameter surrounded by the groove bottom of the inner sealing groove 51, the two ends of the outer pressure ring groove 54 respectively extend to the end face of the packing gland 5 and the outer sealing groove 52, the circumference diameter surrounded by the groove bottom of the outer pressure ring groove 54 is greater than or equal to the circumference diameter surrounded by the groove bottom of the outer sealing groove 51, and the cross section of the pressure ring 8 in the vertical plane is in the shape of U and the lengths of the two ends are greater than the lengths of the inner pressure ring groove 53 and the outer pressure ring groove 54 respectively.

[0017] In the assembling process, the inner sealing ring 6 and the outer sealing ring 7 are first installed on the inner wall and the outer wall of the packing gland 5, then the compression ring 8 is sleeved on the end of the packing gland 5, the two ring bodies on the same side of the compression ring 8 are respectively inserted into the inner compression ring groove 53 and the outer compression ring groove 54 and respectively top-touch the inner sealing ring 6 and the outer sealing ring 7, the compression ring 8 has a gap with the sleeved end of the packing gland 5, then the packing gland 5 is sleeved on the valve stem 3 and moves towards the packing 4, the compression ring 8 first adheres to the packing 4 and presses the packing 4, as the packing gland 5 continues to move downwards and the packing 4 has been compacted by the compression ring 8, the packing gland 5 moves downwards relative to the compression ring 8, the gap between the compression ring 8 and the packing gland 5 in the length direction of the valve stem 3 is reduced, the two ring bodies on the compression ring 8 respectively extrude the inner sealing ring 6 and the outer sealing ring 7 so that the inner sealing ring 6 and the outer sealing ring 7 are elastically deformed to respectively adhere to the outer wall of the valve stem 3 and the inner wall of the valve body 1, until the packing gland 5 cannot move downwards, then the packing gland 5 is connected to the valve body 1 in place, when the packing 4 needs to be replaced or supplemented, the packing gland 5 is moved upwards, the inner sealing ring 6 and the outer sealing ring 7 are restored to deformation and push the compression ring 8 downwards relative to the packing gland 5, the adhesion of the inner sealing ring 6 and the outer sealing ring 7 to the valve stem 3 and the valve body 1 is reduced or even disappears, after the packing gland 5 is removed from the valve body 1, the compression ring 8 and the packing 4 are taken out in turn by tools;

[0018] Such design can extrude the inner sealing ring 6 and the outer sealing ring 7 near the packing 4 to force the inner sealing ring 6 and the outer sealing ring 7 to form effective soft sealing with the valve stem 3 and the valve body respectively, effectively avoid the medium leakage, and improve the connection stability of the packing gland 5 and the valve body 1; in the disassembling process, the inner sealing ring 6 and the valve stem 3 and the outer sealing ring 7 and the valve body 1 are in a relaxed state, which facilitates the disassembling operation of the packing gland 5 relative to the valve body 1 and improves the disassembling efficiency.

[0019] As an improved embodiment, refer to Figure 2 and Figure 3As shown in the figure, the elastic connecting piece 9 is arranged between the compression ring 8 and the packing gland 5, which can be a soft rubber ring. The two end faces of the soft rubber ring are adhered to the packing gland 5 and the compression ring 8 respectively by adhesive method, so that the compression ring 8 and the packing gland 5 are connected together. When the packing gland 5 moves downward relative to the compression ring 8, the soft rubber ring is compressed. When the packing gland 5 moves upward relative to the compression ring 8, the soft rubber ring restores elastic deformation. This design can realize the synchronous movement of the compression ring 8 and the packing gland 5, further improve the disassembly efficiency, and prevent the inner sealing ring 6 and the outer sealing ring 7 from falling off when the compression ring 8 is not in contact.

[0020] As an improved embodiment, refer to Figure 2 and Figure 3 As shown in the figure, the end face of the compression ring 8 towards the packing 4 is in the shape of a circular truncated cone with the large end towards the packing 4. This design can increase the fitting surface of the compression ring 8 and the packing 4, and provide a pushing force for the packing 4 towards the center of the valve stem 3, forcing the packing 4 to tightly fit the valve stem 3 to form a stable seal.

[0021] As an improved embodiment, refer to Figure 2 and Figure 3 As shown in the figure, the ring body outer wall of the inner compression ring groove 53 or the ring body inner wall of the outer compression ring groove 54 is processed with a hook groove 81 when the compression ring 8 is inserted. The hook groove 81 is near the end of the ring body. After the compression ring 8 is separated from the packing gland 5, a tool with a hook can hook the hook groove 81 and move the compression ring 8 out of the valve body 1. This design effectively improves the disassembly efficiency of the compression ring 8.

[0022] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution under the idea of the present application belongs to the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application can also be considered as the protection scope of the present application.

Claims

1. A fluorine-lined ball valve with good sealing performance, comprising a valve body (1), a ball (2) located in the valve body (1), a valve stem (3) connected with the ball (2), a packing (4) located outside the valve stem (3), a packing gland (5) for pressing the packing (4), an inner sealing ring (6) and an outer sealing ring (7) respectively located on the inner wall and the outer wall of the packing gland (5), and the inner wall and the outer wall of the packing gland (5) are respectively provided with an inner sealing groove (51) and an outer sealing groove (52) for accommodating the inner sealing ring (6) and the outer sealing ring (7), characterized in that: The inner wall and the outer wall of the packing gland (5) are respectively provided with an inner pressure ring groove (53) and an outer pressure ring groove (54) coaxial with the packing gland (5), the two ends of the inner pressure ring groove (53) distributed along the axis direction of the packing gland (5) respectively extend to the end face of the packing gland (5) facing the packing (4) and the inner sealing groove (51), the diameter of the inner pressure ring groove (53) is less than or equal to the diameter of the inner sealing groove (51), the two ends of the outer pressure ring groove (54) distributed along the axis direction of the packing gland (5) respectively extend to the end face of the packing gland (5) facing the packing (4) and the outer sealing groove (52), the diameter of the outer pressure ring groove (54) is greater than or equal to the diameter of the outer sealing groove (52), the end of the packing gland (5) facing the packing (4) is provided with a pressure ring (8) with a U-shaped cross section and two ends respectively extending into the inner pressure ring groove (53) and the outer pressure ring groove (54), the inner sealing ring (6) and the outer sealing ring (7) are extruded by the pressure ring (8) to make the inner sealing ring (6) and the outer sealing ring (7) both elastically deformed to fit the outer wall of the valve stem (3) and the inner wall of the valve body (1) respectively.

2. The fluorine-lined ball valve according to claim 1, wherein: The pressure ring (8) and the packing gland (5) are provided with an elastic connecting piece (9).

3. The fluorine-lined ball valve with good sealing performance according to claim 1 or 2, characterized in that: The end face of the pressure ring (8) abutting against the packing (4) is inclined relative to the horizontal plane.

4. The fluorine-lined ball valve with good sealing performance according to claim 1 or 2, characterized in that: The surface of the pressure ring (8) opposite to the outer pressure ring groove (54) or the surface of the pressure ring (8) opposite to the inner pressure ring groove (53) is provided with a hook groove (81).

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