CN214662202U

CN214662202U - Low-loss ball valve with packing structure

Info

Publication number: CN214662202U
Application number: CN202120884589.1U
Authority: CN
Inventors: 郑应牌; 林鹏伟; 周玉庭; 潘教强; 吴健健; 刘云飞; 林仁策
Original assignee: Zhejiang Oufei Petroleum Equipment Co ltd
Current assignee: Zhejiang Oufei Petroleum Equipment Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-11-09
Anticipated expiration: 2031-04-27

Abstract

The utility model relates to a low-loss packing structure ball valve, which comprises a valve body, a valve cover, a valve rod and a low-loss packing component, wherein the low-loss packing component comprises an upper cover, a first packing and a second packing; the upper cover is arranged between the connecting disc and the valve cover, at least part of the inner side wall of the upper cover is attached to the outer wall of the valve rod, a first packing cavity is formed by one side wall of the upper cover, the outer wall of the valve rod and the bottom surface of the connecting disc, the first packing is arranged in the first packing cavity, a second packing cavity is formed by the bottom surface of the upper cover, the side wall of the valve cover and the outer wall of the valve rod, and the second packing is arranged in the second packing cavity; multiple seals are formed, and the sealing performance is improved.

Description

Low-loss ball valve with packing structure

Technical Field

The utility model relates to a ball valve processing technology field, concretely relates to low loss filler structure ball valve.

Background

With the rapid development of modern large-scale machinery, petroleum, chemical industry, new energy, nuclear industry and other industries, the requirements for valves in the industries are more and more, and especially the requirements for the safety and reliability of the sealing of the valves are higher and higher.

The current chinese utility model patent, its patent publication is CN204004754U, and the patent name is a valve, and low leakage packing structure includes packing chamber, dish spring, filler, dish spring chamber, gland, and the filler setting is at the packing intracavity, and gland sets up on the packing chamber, pushes down the filler, and the dish spring setting is in dish spring intracavity to withstand gland. The structure has the advantages that the positioning pin is arranged externally, the connecting disc is fixedly connected, so that drilling is not needed during assembly, the installation and the disassembly are very convenient, and the low-leakage packing sealing structure consisting of the packing cavity, the disc spring, the packing, the disc spring cavity and the packing gland is arranged at the same time, so that the packing can not be leaked due to the action of the packing gland and the disc spring even if the sealing ring is damaged, and the service life of the utility model is prolonged; but the sealing properties of the structure remain low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve low loss packing structure ball valve of leakproofness.

In order to achieve the above object, the main technical solution of the present invention is a low-loss ball valve with a packing structure, comprising a valve body, a valve cover and a valve rod, wherein the valve cover is disposed on the valve body to form a valve cavity and a medium flow passage communicated with the left and right sides of the valve cavity, a ball body for opening or closing the ball valve is rotatably disposed in the valve cavity, the bottom end of the valve rod extends into the valve cavity and is connected with the ball body, a connecting disc is sleeved on the top of the valve rod, the low-loss ball valve with a packing structure further comprises a low-loss packing assembly, and the low-loss packing assembly comprises an upper cover, a first packing and a second packing; the upper cover is arranged between the connecting disc and the valve cover, at least part of the inner side wall of the upper cover is attached to the outer wall of the valve rod, a first packing cavity is formed by one side wall of the upper cover, the outer wall of the valve rod and the bottom surface of the connecting disc, the first packing is arranged in the first packing cavity, a second packing cavity is formed by the bottom surface of the upper cover, the side wall of the valve cover and the outer wall of the valve rod, and the second packing is arranged in the second packing cavity.

In some examples, an elastic member is further disposed in the second packing cavity, one end of the elastic member abuts against the bottom of the second packing, the other end of the elastic member abuts against the edge at the bottom of the valve rod, and the second packing is clamped between the elastic member and the bottom of the upper cover.

In some examples, at least one first concave groove is arranged on one side wall of the upper cover, which is attached to the valve rod, and an O-shaped ring for enhancing the sealing property is arranged in the first concave groove.

In some examples, the upper cover is Z-shaped, a second concave groove is formed in the side wall, attached to the side wall of the valve cover, of the upper cover, and an O-shaped ring is arranged in the second concave groove.

In some examples, a third concave groove is formed in the side wall, attached to the top surface of the valve cover, of the upper cover, and a refractory pad is filled in the third concave groove.

In some examples, a gasket for enhancing tightness and cushioning is disposed between the second filler and the elastic member.

In some examples, the resilient member is a disc spring.

In some examples, the exterior of the valve stem is journaled to the interface disc by a bearing.

In some examples, the connection pad is equipped with a mounting hole, the upper cover is equipped with the through-hole that corresponds with the mounting hole, be equipped with the butt joint hole that corresponds with the through-hole on the valve gap, wear to establish in proper order through the bolt and twist admittedly in mounting hole, through-hole and butt joint hole, connection pad, upper cover and valve gap pass through bolt interconnect fixed.

The utility model discloses owing to adopted above technical scheme to reach following effect: two groups of low-dissipation fillers are arranged, and the fillers are both made of 316+ braided graphite materials through a deep impregnation technology process, and have low friction coefficient and high performance parameters; forming a plurality of seals; the low leakage design structure, valve switch moment of torsion is light, and the sealed design of multilayer ensures that under abominable operating mode, the high frequency uses the valve, the low loss requirement of valve rod filler.

Drawings

Figure 1 is a schematic structural view of an embodiment of the present invention,

figure 2 is an enlarged view of the portion a of the embodiment of figure 1,

in the figure: the valve comprises a valve cover 1, a valve body 2, a ball body 3, a medium flow passage 4, a connecting disc 5, a valve rod 6, a valve cavity 7, a gasket 8, a bearing 9, a first filler 11, an upper cover 12, a refractory pad 13, a second filler 14, a disc spring 15, a first concave groove 16 and a second concave groove 17.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

It is to be understood that the terms "a" and "an" are to be interpreted as meaning that a number of one element may be one in one embodiment or multiple in another embodiment, and the terms "a" and "an" are not to be interpreted as limiting the number.

The first embodiment is as follows:

referring to fig. 1 to 2 of the drawings of the specification of the present invention, according to a preferred embodiment of the present invention, a low-loss ball valve with a packing structure includes a valve body 2, a valve cover 1 and a valve rod 6, wherein the valve cover 1 is connected to the valve body 2 to form a valve cavity 7 and a medium flow passage 4 communicated with the left and right sides of the valve cavity 7, a ball 3 for opening or closing the ball valve is rotatably disposed in the valve cavity 7, the bottom end of the valve rod 6 extends into the valve cavity 7 and is connected to the ball 3, a connecting disc 5 is sleeved on the top of the valve rod 6, the low-loss ball valve with a packing structure further includes a low-loss packing assembly, and the low-loss packing assembly includes an upper cover 12, a first packing 11 and a second packing 14; the upper cover 12 is arranged between the connecting disc 5 and the valve cover 1, at least part of the inner side wall of the upper cover 12 is attached to the outer wall of the valve rod 6, a first packing 11 cavity is formed by one side wall of the upper cover 12, the outer wall of the valve rod 6 and the bottom surface of the connecting disc 5, the first packing 11 is arranged in the first packing 11 cavity, a second packing 14 cavity is formed by the bottom surface of the upper cover 12, the side wall of the valve cover 1 and the outer wall of the valve rod 6, and the second packing 14 is arranged in the second packing 14 cavity; the components of the first filler 11 and the second filler 14 are the same, and are both 316+ braided graphite, and a square rectangular low-leakage filler is formed by a deep impregnation technology process to reduce the low friction coefficient; in this embodiment, the connecting disc 5 is provided with a mounting hole, the upper cover 12 is provided with a through hole corresponding to the mounting hole, the valve cover 1 is provided with a butt-joint hole corresponding to the through hole, and the connecting disc 5, the upper cover 12 and the valve cover 1 are sequentially inserted and screwed in the mounting hole, the through hole and the butt-joint hole through bolts, and are mutually connected and fixed through bolts, so as to ensure the coaxiality of the valve rod 6, reduce the friction torque of the valve rod 6 and ensure the switching stability of the valve rod 6, in this embodiment, the outside of the valve rod 6 is sleeved with the connecting disc 5 through a bearing 9; according to the technical scheme, two groups of low-dissipation fillers are arranged to form two seals, and the second filler 14 is a first seal so as to reduce the leakage risk between the upper cover 12 and the valve cover 1 and reduce the leakage risk between the upper cover 12 and the valve rod 6; the first packing 11 is a second seal to further reduce the risk of leakage between the upper cap 12 and the valve stem 6.

Specifically, in the present embodiment, the upper cover 12 is in a Z shape, the Z-shaped upper cover 12 is disposed between the connecting disc 5 and the bonnet 1 in an inverted manner, one end of the upper cover 12 is inserted between the bonnet 1 and the valve rod 6, and a second packing 14 cavity is formed between the bottom surface of the end, the outer wall of the valve rod 6 and the inner hole wall of the bonnet 1; the other end side wall of the upper cover 12 forms a first packing 11 cavity together with the outer wall of the valve rod 6 and the bottom surface of the connecting disc 5, in order to enhance the sealing stability of the second filler 14 in the cavity of the second filler 14, in this embodiment, an elastic member is further disposed in the cavity of the second filler 14, one end of the elastic member abuts against the bottom of the second filler 14, the other end of the second packing abuts against the edge at the bottom of the valve rod 6, the second packing 14 is clamped between an elastic part and the bottom of the upper cover 12, the elastic part adopts a disc spring 15, and a spring and the like can be adopted, and the second packing 14 can be clamped between the disc spring 15 and the upper cover 12, two sides of the second packing 14 can be tightly attached to the side wall of the inner hole of the valve cover 1 and the side wall of the valve rod 6, and the disc spring 15 can provide stable pretightening force under the internal pressure and temperature change, so that the sealing stability of the low-leakage packing is ensured.

In order to enhance the sealing property between the side wall of the upper cover 12 and the side wall of the valve rod 6, at least one first concave groove 16 is arranged on one side wall of the upper cover 12, which is attached to the valve rod 6, and an O-ring for enhancing the sealing property is arranged in the first concave groove 16, further, in this embodiment, two first concave grooves 16 are arranged on the side wall of the upper cover 12, and the O-ring is filled in each first concave groove 16; in addition, in order to enhance the sealing property between the side wall of the upper cover 12 and the side wall of the valve cap 1, in this embodiment, a second concave groove 17 is formed in the side wall, to which the side wall of the upper cover 12 and the side wall of the valve cap 1 are attached, an O-ring is arranged in the second concave groove 17, a third concave groove is formed in the side wall, to which the top surface of the upper cover 12 and the top surface of the valve cap 1 are attached, a fire-resistant pad 13 is filled in the third concave groove, and the fire-resistant pad 13 is also made of 316+ woven graphite material.

In this embodiment, a gasket 8 for enhancing tightness and cushioning is disposed between the second filler 14 and the elastic member, and a gasket 8 is also disposed between the first filler 11 and the connecting disc 5 to enhance the pre-tightening force of the first filler 11 in the cavity of the first filler 11.

In summary, compared with the prior art, the technical solution shown in this embodiment has the following innovation points:

1. two groups of low-dissipation fillers are arranged, and the fillers are both made of 316+ braided graphite materials through a deep impregnation technology process, and have low friction coefficient and high performance parameters; forming a plurality of seals; the low leakage design structure, valve switch moment of torsion is light, and the sealed design of multilayer ensures that under abominable operating mode, the high frequency uses the valve, the low loss requirement of 6 packings of valve rod.

2. The valve stem 6 presses the disc spring 15 to make the low leakage packing tightly fit, thereby increasing the sealing performance between the valve stem 6 and the upper cap 12. The disc spring 15 can provide stable pretightening force under the internal pressure and temperature change, and the sealing stability of the low-leakage filler is ensured.

3. The upper cover 12 compresses the low-leakage filler through the bolt, so that the secondary low-leakage structure at the sealing position of the valve rod 6 is safer and more reliable.

4. A plurality of O-shaped rings and fire-resistant gaskets 13 are added on the upper cover 12, and a multi-layer O-shaped ring sealing structure ensures that a low-dissipation structure is more safe under internal pressure.

5. The bearing 9 is added in the connecting disc 5, so that the coaxiality of the valve rod 6 is guaranteed, meanwhile, the low friction torque is guaranteed, and the switching stability of the valve rod 6 is guaranteed.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention.

The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. A low-loss ball valve with a packing structure comprises a valve body (2), a valve cover (1) and a valve rod (6), wherein the valve cover (1) is arranged on the valve body (2) to form a valve cavity (7) and a medium flow channel (4) communicated with the left side and the right side of the valve cavity (7), a ball body (3) used for opening or closing the ball valve is arranged in the valve cavity (7) in a rotating mode, the bottom end of the valve rod (6) extends into the valve cavity (7) and is connected with the ball body (3), and the top of the valve rod (6) is sleeved with a connecting disc (5), and the low-loss ball valve with the packing structure is characterized by further comprising a low-loss packing assembly which comprises an upper cover (12), a first packing (11) and a second packing (14); the upper cover (12) is arranged between the connecting disc (5) and the valve cover (1), at least part of the inner side wall of the upper cover (12) is attached to the outer wall of the valve rod (6), a first filler (11) cavity is formed by one side wall of the upper cover (12), the outer wall of the valve rod (6) and the bottom surface of the connecting disc (5), the first filler (11) is arranged in the first filler (11) cavity, a second filler (14) cavity is formed by the bottom surface of the upper cover (12), the side wall of the valve cover (1) and the outer wall of the valve rod (6), and the second filler (14) is arranged in the second filler (14) cavity.

2. The ball valve with low dissipation packing structure as claimed in claim 1, wherein an elastic member is further disposed in the cavity of the second packing (14), one end of the elastic member abuts against the bottom of the second packing (14), the other end of the elastic member abuts against the edge of the bottom of the valve stem (6), and the second packing (14) is clamped between the elastic member and the bottom of the upper cover (12).

3. The ball valve with the low-dissipation packing structure according to claim 1, wherein at least one first concave groove (16) is formed in a side wall of the upper cover (12) attached to the valve rod (6), and an O-ring for enhancing sealing performance is arranged in the first concave groove (16).

4. The ball valve with the low-dissipation packing structure according to claim 1 or 3, wherein the upper cover (12) is Z-shaped, a second concave groove (17) is formed in the side wall, attached to the side wall of the valve cover (1), of the upper cover (12), and an O-shaped ring is arranged in the second concave groove (17).

5. The ball valve with the low-dissipation packing structure as claimed in claim 4, wherein a third concave groove is formed in the side wall of the upper cover (12) attached to the top surface of the valve cover (1), and a refractory pad (13) is filled in the third concave groove.

6. A low-loss packing structure ball valve in accordance with claim 2, wherein a gasket (8) for enhancing tightness and cushioning is provided between the second packing (14) and the elastic member.

7. A low-dissipation packing structure ball valve according to claim 2 or 6, wherein the elastic member is a disc spring (15).

8. A low-dissipation packing structure ball valve according to claim 1, wherein the valve stem (6) is externally sleeved with the connecting disc (5) through a bearing (9).

9. The ball valve with the low-dissipation packing structure of claim 1, wherein the connecting disc (5) is provided with a mounting hole, the upper cover (12) is provided with a through hole corresponding to the mounting hole, the valve cover (1) is provided with a butt hole corresponding to the through hole, the connecting disc (5), the upper cover (12) and the valve cover (1) are sequentially screwed in the mounting hole, the through hole and the butt hole through bolts, and the connecting disc (5), the upper cover (12) and the valve cover (1) are fixedly connected with each other through bolts.