Valve sealing filler structure

Abstract

The utility model provides a valve sealing filler structure which comprises an annular first filler, and the two axial end faces of the first filler are planes respectively. One axial end face of the second filler is a plane, and the other axial end face of the second filler is provided with a second annular groove; chamfers are arranged on the inner side edge and the outer side edge of one axial end face of the third filler respectively, and a third annular groove is formed in the other axial end face of the third filler. Chamfers are arranged on the inner side edge and the outer side edge of one axial end face of the fourth filler respectively, and the other axial end face of the fourth filler is a plane. The number of the first packing is two, the first packing, the second packing, the third packing, the fourth packing and the first packing are sequentially overlapped for use in the axial direction, the second groove is formed towards an opening of the third packing, the third groove is formed towards an opening of the fourth packing, and the other end face of the fourth packing is connected with the first packing in an abutting mode.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, in particular to a valve sealing packing structure. Background Art

[0002] A valve comprises a valve body, a ball and a valve stem.

[0003] The ball is arranged in the valve body, the valve stem is connected to the valve body, the outer end is connected to the power mechanism, the inner end of the valve stem penetrates and is connected to the ball, and the valve stem drives the ball to move.

[0004] In order to prevent the medium in the valve body from leaking out, the valve stem in motion needs to be dynamically sealed with the valve body. The seal between the valve stem and the valve body is usually achieved by packing.

[0005] Most of the existing packings are annular structures. When used, multiple packing sleeves are usually placed on the valve stem to form a seal with the valve body. The axial end face of the traditional packing is a plane, so that two adjacent packings are in contact through the plane. When the valve stem rotates, the packing with such a structure will generate a large torque force. Moreover, the packing with axial end face contact will only exert force in the axial direction, and cannot provide sealing pressure between the packing and the valve body in the radial direction. Utility Model Content

[0006] In view of the problems pointed out in the background technology, the utility model proposes a valve sealing packing structure to solve the above technical problems, reduce the torque force when the valve stem rotates, and provide sealing pressure to the packing and the valve body in the radial direction.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A valve sealing packing structure, comprising

[0009] An annular first filler, wherein two axial end surfaces of the first filler are respectively flat surfaces;

[0010] An annular second filler, wherein one axial end surface of the second filler is a plane, and the other axial end surface of the second filler is provided with an annular second groove;

[0011] An annular third filler, wherein chamfers are respectively arranged on both inner and outer sides of one axial end surface of the third filler, and an annular third groove is arranged on the other axial end surface of the third filler;

[0012] An annular fourth filler, wherein the inner and outer sides of one axial end surface of the fourth filler are respectively provided with chamfers, and the other axial end surface of the fourth filler is a plane;

[0013] There are two first fillers, and the first filler, the second filler, the third filler, the fourth filler and the first filler are stacked in sequence in the axial direction. The second groove is arranged toward the opening of the third filler, and the third groove is arranged toward the opening of the fourth filler. The other end face of the fourth filler is abutted against the first filler.

[0014] The utility model is further configured that at least two third fillers are provided.

[0015] The utility model is further configured that three third fillers are provided.

[0016] The utility model is further configured such that the width of the second groove gradually widens from the inside to the outside.

[0017] The utility model is further configured such that the width of the third groove gradually widens from the inside to the outside.

[0018] The utility model is further configured such that the bottoms of the second groove and the third groove are respectively provided with protruding annular extrusion rings, and an axial end face of the third filler and an axial end face of the fourth filler are respectively provided with concave annular extrusion grooves.

[0019] The utility model is further configured that the cross section of the extrusion groove is V-shaped.

[0020] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0021] The valve sealing packing structure provided by the utility model has adjacent packings, one of which can enter the groove on another packing, so that a larger contact area can be formed between the adjacent packings. In this way, when the valve stem rotates, the use of the packing of the present application can effectively reduce the torque force of the valve stem rotation. In addition, adjacent packings can be squeezed against each other and produce a radial effect, so that a force is formed between the packing and the valve body and the valve stem to achieve a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is a cross-sectional view of the utility model.

[0025] Figure 3 It is an exploded schematic diagram of the utility model.

[0026] Figure 4 It is a schematic diagram of the structure in which an extrusion ring is arranged on the filler of the utility model.

[0027] Explanation of the numbers in the accompanying drawings: first filler 1, second filler 2, second groove 3, third filler 4, chamfer 5, third groove 6, fourth filler 7, extrusion ring 8, extrusion groove 9. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] For reference Figure 1-4 The utility model is described as follows:

[0030] Embodiment 1: A valve sealing packing structure, comprising a first packing 1, a second packing 2, a third packing 4, and a fourth packing 7 in an annular shape, wherein the outer diameters and the inner diameters of the first packing 1, the second packing 2, the third packing 4, and the fourth packing 7 are equal, and the first packing 1, the second packing 2, the third packing 4, and the fourth packing 7 are all made of rubber material. Two first packings 1 are provided, one second packing 2 is provided, three third packings 4 are provided, and one fourth packing 7 is provided. In the axial direction, the first packing 1, the second packing 2, the third packing 4, the third packing 4, the third packing 4, the fourth packing 7, and the first packing 1 are stacked in sequence for use.

[0031] The two axial end faces of the first filler 1 are respectively planes.

[0032] One axial end face of the second filler 2 is a plane, and the other axial end face of the second filler 2 is provided with a circular second groove 3, and the width of the second groove 3 is gradually widened from the inside to the outside. When in use, one axial end face of the second filler 2 is butted against one end face of the first filler 1.

[0033] Chamfers 5 are respectively provided on the inner and outer sides of one axial end face of the third filler 4, so that one axial end of the third filler 4 is tapered, and the other axial end face of the third filler 4 is provided with a circular third groove 6, and the width of the third groove 6 is gradually widened from the inside to the outside. When in use, one axial end face of the third filler 4 enters the second groove 3, and between adjacent third fillers 4, the tapered end face of the third filler 4 enters the third groove 6.

[0034] Chamfers 5 are provided on the inner and outer sides of one axial end face of the fourth filler 7, so that one axial end of the fourth filler 7 is conical and the other axial end face of the fourth filler 7 is flat. When in use, the conical end face of the fourth filler 7 enters the third groove 6, and the other axial end face of the fourth filler 7 is butted against one end face of the first filler 1.

[0035] In the above technical solution, the tapered end of the packing enters the tapered groove. One reason is that it can increase the contact area between adjacent packings and reduce the torque generated when the valve stem rotates; the other reason is that the tapered end of the packing enters the groove to squeeze the packing on both sides of the groove, generate radial force, and form a radial force between the packing and the valve body and the valve stem, thereby improving the sealing effect.

[0036] A protruding annular extrusion ring 8 is provided at the bottom of the second groove 3 and the third groove 6, respectively. An axial end face of the third filler 4 and an axial end face of the fourth filler 7 are respectively provided with a concave annular extrusion groove 9. The cross-section of the extrusion groove 9 is V-shaped. When the tapered end of the filler enters the groove, the extrusion ring 8 can also enter the extrusion groove 9, forming an extrusion on the tapered end of the filler, so that the tapered end of the filler can also expand and deform, thereby improving the sealing performance.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve sealing packing structure, characterized in that: include An annular first filler (1), wherein two axial end surfaces of the first filler (1) are respectively plane surfaces; An annular second filler (2), wherein one axial end surface of the second filler (2) is a plane, and the other axial end surface of the second filler (2) is provided with an annular second groove (3); An annular third filler (4), wherein chamfers (5) are respectively provided on both inner and outer sides of one axial end surface of the third filler (4), and an annular third groove (6) is provided on the other axial end surface of the third filler (4); An annular fourth filler (7), wherein chamfers (5) are respectively arranged on the inner and outer sides of one axial end face of the fourth filler (7), and the other axial end face of the fourth filler (7) is a plane; The first filler (1) is provided with two, and in the axial direction, the first filler (1), the second filler (2), the third filler (4), the fourth filler (7), and the first filler (1) are stacked in sequence for use, the second groove (3) is opened toward the third filler (4), the third groove (6) is opened toward the fourth filler (7), and the other end face of the fourth filler (7) is butted against the first filler (1).

2. A valve sealing packing structure according to claim 1, characterized in that: At least two third fillers (4) are provided.

3. A valve sealing packing structure according to claim 2, characterized in that: The third fillers (4) are provided in three numbers.

4. A valve sealing packing structure according to claim 1, characterized in that: The width of the second groove (3) is gradually widened from the inside to the outside.

5. A valve sealing packing structure according to claim 1, characterized in that: The width of the third groove (6) is gradually widened from the inside to the outside.

6. A valve sealing packing structure according to claim 1, characterized in that: The bottoms of the second groove (3) and the third groove (6) are respectively provided with protruding annular extrusion rings (8), and an axial end face of the third filler (4) and an axial end face of the fourth filler (7) are respectively provided with concave annular extrusion grooves (9).

7. A valve sealing packing structure according to claim 6, characterized in that: The cross section of the extrusion groove (9) is V-shaped.

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