CN210770260U

CN210770260U - Needle-shaped stop valve

Info

Publication number: CN210770260U
Application number: CN201921469524.XU
Authority: CN
Inventors: 周卫东; 刘小念; 胡强; 李伟; 李坪; 崔禹海
Original assignee: Sichuan Jianyang Chuanli Machinery Work Co ltd
Current assignee: Sichuan Jianyang Chuanli Machinery Work Co ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2020-06-16
Anticipated expiration: 2029-09-05

Abstract

The utility model discloses a needle stop valve, which comprises a valve body, a gland nut, a valve rod and a sleeve pipe assembly, wherein the sleeve pipe assembly comprises a sleeve pipe, a gasket and a limit nut, the valve rod is a second-stage stepped shaft, a large-diameter shaft of the valve rod is positioned in a valve cavity, and a small-diameter end of the valve rod is connected with the limit nut through threads after passing through a central hole of the sleeve pipe; the outer wall of the sleeve is in threaded connection with a threaded hole of the compression nut, and the inner hole of the sleeve is in clearance fit with the valve rod; the gasket is the metal toper gasket, and the gasket has two, is last gasket and lower gasket respectively, goes up the gasket and overlaps respectively with lower both ends at the valve rod minor diameter axle, and the upper and lower both ends of going up the gasket contact with stop nut and sheathed tube top respectively, and the lower both ends of going down the gasket contact with sheathed tube bottom and the major diameter axle tip of valve rod respectively. The utility model discloses make the valve rod only have the ascending removal of axial, can not produce rotatoryly to the condition of the position wearing and tearing of contact with it appears on the sealed face of toper by the disk seat on avoiding the valve rod.

Description

Needle-shaped stop valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to aciculiform stop valve.

Background

A needle valve is a trim valve whose plug is needle-shaped and is used primarily to regulate the flow of fluids, particularly gases. The needle valve requires that the valve port is opened gradually and finely and continuously from closing to opening. The needle-shaped valve plug is typically formed from a long, hardened steel needle, while the valve seat is preferably formed from a soft material such as tin, copper, or the like. The sealing between the valve needle and the valve seat is achieved by the close fit of the conical surfaces of the valve needle and the valve seat.

The prior art CN208364804U discloses a marine external thread high-pressure needle stop valve, which comprises a valve body, a valve rod nut, a needle valve head and a packing layer, wherein the upper end of the valve body is fixedly connected with a valve cover, the center of the lower surface of the valve cover is fixedly connected with the valve rod nut, the valve rod nut is in threaded connection with the outer surface of the valve rod, a cavity is longitudinally arranged in the valve body, the lower part of the cavity is in an inverted cone shape, the lower part of the valve rod is sleeved in the cavity, and the upper; the lower part of the valve rod nut is provided with a packing layer which is tightly embedded in the outer surface of the valve rod and the inner wall of the cavity at the upper part of the valve body, the lower part of the valve rod is fixedly connected with a convex block which is attached to the inner wall of the cavity, and the lower end of the convex block is fixedly connected with a needle-shaped valve head. The opening and closing working process of the needle valve is as follows: the valve rod is rotated around the axis of the valve rod, so that the valve rod rotates relative to the valve rod nut, and the valve rod moves axially relative to the valve body to realize sealing contact with or separation from a valve seat in the valve cavity, and the valve is closed and opened.

Because the valve rod can be in sealing contact with or separated from the valve seat in the valve cavity only under the rotation action based on thread matching, and the sealing between the valve needle and the valve seat is realized by the tight contact of the conical surfaces of the valve rod and the valve seat, the valve rod and the valve seat can generate relative rotation, when the valve rod and the valve seat are in tight contact, friction is generated, the conical sealing surface on the valve rod is abraded by the part of the valve seat, which is in contact with the conical sealing surface, and then the sealing performance between the valve rod and the valve seat is reduced.

Disclosure of Invention

The utility model aims to provide a: the needle stop valve solves the problems that in an existing needle valve, when a valve rod moves axially through rotation, a sealing surface is abraded, and sealing performance is reduced. The utility model relates to a needle stop valve makes the rotatory valve rod of needs originally only axial displacement to can produce relative rotation between elimination valve rod and the disk seat, avoid then the sealed face of toper on the valve rod to appear by the condition of the position wearing and tearing of contact with it on the disk seat, guaranteed the leakproofness between valve rod and the disk seat in the needle stop valve, improved the life of needle stop valve, reduced the maintenance frequency in later stage.

The utility model adopts the technical scheme as follows:

a needle stop valve comprises a valve body, a compression nut fixed on the valve body and a valve rod with one end positioned in a valve cavity and used for controlling the on-off of a flow passage in the valve body and the other end penetrating through the compression nut and in threaded connection with the compression nut, wherein a sleeve assembly is arranged between the compression nut and the valve rod and comprises a sleeve, a gasket and a limit nut, wherein,

the valve rod is a two-stage stepped shaft, a large-diameter shaft of the valve rod is positioned in the valve cavity, and a small-diameter end of the valve rod penetrates through a central hole of the sleeve and then is in threaded connection with the limiting nut;

the outer wall of the sleeve is in threaded connection with a threaded hole of the compression nut, and the inner hole of the sleeve is in clearance fit with the valve rod;

the packing ring is metal toper packing ring, and the packing ring has two, is last packing ring and lower packing ring respectively, go up the packing ring and establish respectively with lower packing ring at the upper and lower both ends of valve rod path axle, and go up the upper and lower both ends of packing ring and contact with stop nut and sheathed tube top respectively, down the packing ring, down both ends respectively with the contact of sheathed tube bottom and the path axle head portion of valve rod.

When the flow passage in the valve body needs to be opened or closed, the sleeve is rotated, and the sleeve moves upwards or downwards through the thread fit between the sleeve and the compression nut, so that the valve rod which is positioned in the sleeve and fixed relative to the sleeve in the axial direction is driven to move upwards or downwards, and then the flow passage in the valve body is opened or closed.

The valve rod is in clearance fit with the sleeve, and no friction is generated between the inner wall of the sleeve and the outer wall of the valve rod; the axial positioning between the valve rod and the sleeve is realized through the top end of the large-diameter section of the valve rod and the limiting nut, and gaskets in the shape of metal cones are arranged between the axially positioned structures or parts and the sleeve, so that the top end of the sleeve is in line-line contact with the limiting nut at the upper end of the upper gasket, the lower end of the upper gasket is in line-surface contact with the sleeve, the contact surface of the upper gasket is small, and then the friction force between the sleeve and the valve rod is small; simultaneously in the sheathed tube bottom, the upper and lower both ends of lower packing ring are the line face contact respectively with the terminal surface of sleeve pipe and major diameter section between, and its contact surface is little, then frictional force between sleeve pipe and valve rod is little. Like this when rotating the sleeve pipe, the sleeve pipe can't transmit sufficient frictional force and drive the valve rod and rotate, makes then the valve rod only have the ascending removal of axial, can not produce rotatoryly to can produce relative rotation between elimination valve rod and the disk seat, avoid then the condition that the toper on the valve rod is sealed the face by the position wearing and tearing of contact with it on the disk seat to appear, guaranteed the leakproofness between valve rod and the disk seat in the aciculiform stop valve, improved the life of aciculiform stop valve, reduced the maintenance frequency in later stage.

Preferably, the utility model discloses in all process into smooth surface with the position of packing ring contact to further reduce the surface roughness at the position of end and packing ring contact, reduce coefficient of friction then, thereby further reduce frictional force, and packing ring and valve rod clearance fit.

The metal conical washer is used for preventing the vertical stressed deformation of the metal conical washer and increasing the contact surface between the metal conical washer and a contact part. The gasket made of metal makes good use of the hardness thereof to prevent deformation under stress.

Due to the adoption of the technical scheme, the beneficial effects of the utility model are that:

1. the utility model relates to a needle stop valve, when rotating the sleeve pipe, the sleeve pipe can't transmit sufficient frictional force to drive the valve rod and rotate, then make the valve rod only have the ascending movement of axial, can not produce and rotate, thus eliminate and can produce the relative rotation between valve rod and the valve seat, then avoid the conical seal face on the valve rod to appear by the condition that the position that contacts with it on the valve seat abrades, guarantee the leakproofness between valve rod and the valve seat in the needle stop valve, has improved the life of needle stop valve, has reduced the maintenance frequency in later stage;

2. the utility model relates to a needle stop valve adopts the conical washer of metal, is in order to prevent that its vertical atress from warping and increase and the contact surface between the contact site. The metal gasket well utilizes the hardness thereof to prevent the gasket from deforming under stress;

3. the utility model relates to a needle stop valve, the pole portion of top tight screw and with the tank bottom contact of recess, and the top is tight at the recess tank bottom, and the recess tank bottom is the plane that is perpendicular to the axis of top tight screw, and this has increased the contact surface between top tight screw rod and the sleeve pipe, has increased the frictional force between them then, has guaranteed the synchronism between handle subassembly and the sleeve pipe then, prevents the condition of skidding to appear;

4. the utility model relates to a aciculiform stop valve, the setting of spacing subassembly prevents that gland nut from loosening in the vibration that comes when fluid flows, has improved the stability that gland nut fixed on the valve body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, and the proportional relationship of each component in the drawings in the present specification does not represent the proportional relationship in the actual material selection design, and is only a schematic diagram of the structure or the position, in which:

fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view at C of FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

FIG. 4 is a schematic view of the construction of the gasket;

FIG. 5 is a schematic view of the configuration of the valve stem and sleeve engagement.

Reference numerals in the drawings indicate:

1-valve body, 2-valve rod, 3-filler, 4-lower pressure washer, 5-inner hexagon screw, 6-compression nut, 7-handle, 8-top screw, 9-limit screw, 10-support cylinder, 11-support cylinder, 12-retainer ring, 13-internal thread sleeve, 14-sleeve, 15 a-upper washer, 15 b-lower washer, 16-limit nut, 17-connecting hole, 18-top hole, 19-groove and 20-valve cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The present invention will be described in detail with reference to fig. 1 to 5.

Example 1

As shown in fig. 1-5, the needle stop valve of the present invention comprises a valve body 1, a gland nut 6 fixed on the valve body 1, and a valve rod 2 having one end located in a valve cavity 20 for controlling the on/off of the flow passage inside the valve body and the other end passing through the gland nut 6 and being in threaded connection with the valve rod, wherein a sleeve assembly is arranged between the gland nut 6 and the valve rod 2, the sleeve assembly comprises a sleeve 14, a washer and a stop nut 16, wherein,

the valve rod 2 is a two-stage stepped shaft, a large-diameter shaft of the valve rod is positioned in the valve cavity, and a small-diameter end of the valve rod penetrates through a central hole of the sleeve 14 and then is in threaded connection with the limiting nut 16;

the outer wall of the sleeve 14 is in threaded connection with a threaded hole of the compression nut 6, and an inner hole of the sleeve is in clearance fit with the valve rod 2;

the packing ring is metal taper packing ring, and the packing ring has two, is last packing ring 15a and lower packing ring 15b respectively, go up packing ring 15a and lower packing ring 15b and establish respectively at the upper and lower both ends of 2 footpath axles of valve rod, and the upper and lower both ends of going up packing ring 15a contact with stop nut 16 and the top of sleeve pipe 14 respectively, packing ring 15b down, both ends respectively with the bottom of sleeve pipe 14 and the big footpath axle tip contact of valve rod 2.

When the flow passage in the valve body needs to be opened or closed, the sleeve 14 is rotated, the sleeve 14 moves upwards or downwards through the thread fit between the sleeve 14 and the compression nut 6, so that the valve rod 2 which is positioned in the sleeve 14 and axially fixed relative to the sleeve is driven to move upwards or downwards, and then the flow passage in the valve body is opened or closed.

The valve rod 2 is in clearance fit with the sleeve 14, and no friction is generated between the inner wall of the sleeve 14 and the outer wall of the valve rod; the axial positioning between the valve rod 2 and the sleeve 14 is realized by the top end of the large diameter section of the valve rod 2 and the limiting nut 16, and gaskets in the shape of metal cones are arranged between the structures or components of the axial positioning and the sleeve 14, so that the top end of the sleeve 14 is in line-line contact with the limiting nut 16 at the upper end of the upper gasket 15a, the lower end of the upper gasket is in line-surface contact with the sleeve 14, the contact surface of the upper gasket is small, and the friction force between the sleeve 14 and the valve rod 2 is small; meanwhile, at the bottom end of the sleeve 14, the upper end and the lower end of the lower gasket 15b are in line-surface contact with the sleeve and the end face of the large-diameter section respectively, the contact surface is small, and then the friction force between the sleeve 14 and the valve rod 2 is small. Like this when rotating sleeve pipe 14, sleeve pipe 14 can't transmit sufficient frictional force and drive valve rod 2 and rotate, make the valve rod only have the ascending removal of axial then, can not produce rotatoryly, thereby eliminate and can produce relative rotation between valve rod and the disk seat, then avoid the condition that the toper sealed face on the valve rod is worn and torn by the position of contact with it on the disk seat to appear, guaranteed the leakproofness between valve rod and the disk seat in the needle stop valve, improved the life of needle stop valve, reduced the maintenance frequency in later stage.

Example 2

In this embodiment, a driving structure of the sleeve 4 is explained based on embodiment 1.

As shown in fig. 1, in the utility model, the top of sleeve pipe 14 is provided with handle assembly, handle assembly includes handle 7 and top tight screw 8 the bottom of handle 7 is provided with connecting hole 17, is provided with the tight hole 18 in top that communicates with connecting hole 17 on its lateral wall, the top of valve rod 2 and the top of sleeve pipe 14 all insert in connecting hole 17, top tight screw 8 is arranged in the tight hole 18 in top to with top tight hole threaded connection, and its pole portion end top on the lateral wall of sleeve pipe 14 and on the position relative with the tight hole 18 in top.

The handle assembly facilitates rotation of the sleeve 14 with more effort and convenience.

Furthermore, the tightening screw 8 is a socket head cap tightening screw, a groove 19 is formed in the side wall of the sleeve 14 and at a position opposite to the tightening hole 18, the bottom of the groove 19 is a plane and perpendicular to the axis of the tightening screw 8, and the end of the rod of the tightening screw 8 is inserted into the groove 19 and contacts with the bottom of the groove 19.

The pole portion of the puller screw 8 contacts with the groove bottom of the groove 19 and is tightly propped against the groove bottom of the groove, and the groove bottom of the groove is a plane which is perpendicular to the axis of the puller screw 8, so that the contact surface between the puller screw 8 and the sleeve 14 is increased, the friction force between the puller screw 8 and the sleeve 14 is increased, the synchronism between the handle assembly and the sleeve 14 is ensured, and the slipping is prevented.

Example 3

In this embodiment, a description is given of a fitting portion between the valve body and the valve stem on the basis of the above embodiment.

As shown in fig. 1, in the utility model, the top of valve body 1 is provided with the screw hole, gland nut 6's bottom insert in the screw hole and with screw hole threaded connection, be provided with the sealed hole that communicates with valve pocket 20 at the bottom of the hole of screw hole, form the annular space between the big footpath end of sealed hole and valve rod 2, be provided with filler 3 in the annular space, the cover is equipped with gland washer 4 on valve rod 2, gland washer 4 upper and lower surface respectively with gland nut 6's bottom and filler 3's top contact.

Preferably, the filler 3 has three layers. The flavoring is used for realizing movable connection type sealing between the valve body and the valve rod, so that the valve rod can move axially and can keep sealing with the valve body.

In the present valve, the sealing structure between the valve stem and the valve body includes: the valve comprises a threaded connection part between a compression nut and a valve body, a threaded connection part between a sleeve and the compression nut, and a matching part between a filler and the valve body as well as a valve rod.

Example 4

In this embodiment, the limiting and positioning of the compression nut are explained based on embodiment 3.

As shown in fig. 1, the utility model discloses in, still include spacing subassembly, spacing subassembly includes locating plate 10, a support section of thick bamboo 11 and stop screw 9, locating plate 10 cup joints on the position that lies in the 1 outside of valve body on gland nut 6, support a section of thick bamboo 11 and fix on the surface of valve body 1, and its axis is parallel with the axis of valve rod 2, the pole portion end of stop screw 9 runs through one side of locating plate 10 in proper order, behind the centre bore of a support section of thick bamboo 11, with 1 threaded connection of valve body, and the upper and lower surface of locating plate 10 contacts with the head of stop screw 9 and the top of a support section of thick bamboo 10 respectively.

The setting of spacing subassembly prevents that gland nut 6 from lax in the vibration that brings when fluid flow, has improved the stability that gland nut 6 fixed on the valve body.

Example 5

In this embodiment, the inlet and outlet structures of the flow channel are explained based on the above embodiments.

As shown in fig. 1, the utility model discloses in the feed liquor section and the play liquid section of runner all are provided with the second grade shoulder hole, the end and the runner intercommunication of the path section of shoulder hole all are provided with pipeline coupling assembling in the shoulder hole, pipeline coupling assembling includes rand 12 and the external screw thread section of thick bamboo 13 that the axis coincides each other, rand 12 is arranged in the path section of shoulder hole, and its axis coincides with the axis of second grade shoulder hole, the external screw thread section of thick bamboo 13 and the big footpath section threaded connection of shoulder hole to with the one end of rand 12 top on the path section of shoulder hole with the runner intercommunication.

When the valve is connected with a pipeline, the external thread cylinder 13 is screwed down, so that the clamping ring 12 is pressed in the flow channel, and is radially expanded to realize the sealing between the flow channel and the pipeline connecting assembly; the outer pipe is inserted into collar 12 and is threaded into the inner wall of the collar.

Further, the gasket is an aluminum bronze material, specifically QAL 10-4-4. The aluminum bronze has high strength, hardness and wear resistance, and the aluminum bronze can well avoid the deformation of the gasket caused by axial stress.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can be covered within the protection scope of the present invention without the changes or substitutions conceived by the inventive work within the technical scope disclosed by the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a aciculiform stop valve, includes valve body (1), fixes gland nut (6) and one end on valve body (1) and is arranged in break-make, the other end that are used for controlling the inside runner of valve body in valve pocket (20) and wears out gland nut (6) and valve rod (2) with it threaded connection, its characterized in that: a sleeve assembly is arranged between the compression nut (6) and the valve rod (2), the sleeve assembly comprises a sleeve (14), a gasket and a limit nut (16), wherein,

the valve rod (2) is a two-stage stepped shaft, a large-diameter shaft of the valve rod is positioned in the valve cavity, and a small-diameter end of the valve rod penetrates through a central hole of the sleeve (14) and then is in threaded connection with the limiting nut (16);

the outer wall of the sleeve (14) is in threaded connection with a threaded hole of the compression nut (6), and an inner hole of the sleeve is in clearance fit with the valve rod (2);

the packing ring is metal toper packing ring, and the packing ring has two, is last packing ring (15 a) and lower packing ring (15 b) respectively, go up packing ring (15 a) and lower packing ring (15 b) and establish respectively at the upper and lower both ends of valve rod (2) path axle, and go up the upper and lower both ends of packing ring (15 a) and contact with the top of stop nut (16) and sleeve pipe (14) respectively, down packing ring (15 b), down both ends respectively with the bottom of sleeve pipe (14) and the big diameter axle tip contact of valve rod (2).

2. A needle shut off valve according to claim 1, wherein: the top of sleeve pipe (14) is provided with handle components, handle components includes handle (7) and top tight screw (8) the bottom of handle (7) is provided with connecting hole (17), is provided with on its lateral wall with top tight hole (18) of connecting hole (17) intercommunication, the top of valve rod (2) and the top of sleeve pipe (14) all insert in connecting hole (17), top tight screw (8) are located top tight hole (18) to with top tight hole threaded connection, and its pole portion end top on the lateral wall of sleeve pipe (14) and with top tight hole (18) relative position.

3. A needle shut off valve according to claim 2, wherein: the jacking screw (8) is a socket head cap end jacking screw, a groove (19) is formed in the side wall of the sleeve (14) and in the position opposite to the jacking hole (18), the bottom of the groove (19) is a plane and perpendicular to the axis of the jacking screw (8), and the tail end of the rod of the jacking screw (8) is inserted into the groove (19) and is in contact with the bottom of the groove (19).

4. A needle shut off valve according to claim 1, wherein: the valve comprises a valve body (1) and is characterized in that a threaded hole is formed in the top end of the valve body (1), the bottom end of a compression nut (6) is inserted into the threaded hole and is in threaded connection with the threaded hole, a sealing hole communicated with a valve cavity (20) is formed in the hole bottom of the threaded hole, an annular space is formed between the sealing hole and the large-diameter end of a valve rod (2), packing (3) is arranged in the annular space, a compression gasket (4) is sleeved on the valve rod (2), and the upper surface and the lower surface of the compression gasket (4) are respectively in contact with the bottom end of the compression nut (6) and the top.

5. A needle shut off valve according to claim 4, characterised in that: still include spacing subassembly, spacing subassembly includes locating plate (10), a support section of thick bamboo (11) and stop screw (9), locating plate (10) cup joint on gland nut (6) and lie in the position in the valve body (1) outside, a support section of thick bamboo (11) are fixed on the surface of valve body (1), and its axis is parallel with the axis of valve rod (2), the pole portion end of stop screw (9) runs through one side of locating plate (10), behind the centre bore of a support section of thick bamboo (11) in proper order, with valve body (1) threaded connection, and the upper and lower surface of locating plate (10) contacts with the head of stop screw (9) and the top of a support section of thick bamboo (11) respectively.

6. A needle shut off valve according to claim 5, characterised in that: the filler (3) has three layers.

7. A needle shut off valve according to any one of claims 1 to 6 wherein: the feed liquor section of runner all is provided with the second grade shoulder hole with liquid outlet section, the end and the runner intercommunication of the path section of shoulder hole all are provided with pipeline coupling assembling in the shoulder hole, pipeline coupling assembling includes rand (12) and an external screw thread section of thick bamboo (13) that the axis coincides each other, rand (12) are arranged in the path section of shoulder hole, and its axis coincides with the axis of second grade shoulder hole, an external screw thread section of thick bamboo (13) and the path section threaded connection of shoulder hole to with rand (12) top on the path section of shoulder hole with the one end of runner intercommunication.

8. A needle shut off valve according to any one of claims 1 to 6 wherein: the gasket is made of aluminum bronze material.