CN211715821U

CN211715821U - Eccentric shaft connecting structure of ball valve ball body valve rod

Info

Publication number: CN211715821U
Application number: CN202020184539.8U
Authority: CN
Inventors: 袁剑; 谢涛
Original assignee: Sichuan Scgute Valve Manufacturing Co ltd
Current assignee: Sichuan Scgute Valve Manufacturing Co ltd
Priority date: 2020-02-19
Filing date: 2020-02-19
Publication date: 2020-10-20
Anticipated expiration: 2030-02-19

Abstract

The utility model relates to an eccentric shaft connection structure of ball valve spheroid valve rod, it is connected by valve body (1), spheroid (2), bottom (4), valve rod (8), bearing I (7), bearing II (9), flat bearing (10), packing box (12), gland (17), support (18), worm wheel (21) and constitutes, valve rod (8) have big cylinder (26) and eccentric little cylinder (28), and eccentric structure's valve rod (8) is fine with the coincidence of the eccentric hole structure of spheroid (2), compact structure, and eccentric shaft cross sectional area is big, and the power of transmission is also big, and ball valve spheroid switching process is steady, and valve rod (8) eccentric shaft non-deformable and destruction are obvious than traditional structure advantage.

Description

Eccentric shaft connecting structure of ball valve ball body valve rod

Technical Field

The utility model relates to a ball valve spheroid technical field, concretely relates to eccentric shaft connection structure of ball valve spheroid valve rod.

Background

In the design of the ball valve, the cylindrical surface of the valve rod is often designed to be milled flat or milled square and then placed into a rectangular groove or a square groove of a ball body, the valve rod is driven by a transmission device (usually a handle or a worm gear and the like), and the valve rod drives the ball body to rotate by 90 degrees, so that the aim of opening and closing the ball body is fulfilled. However, after the valve rod cylinder is milled flat or square, the cross section is greatly reduced, and when the stress of the ball body is large, the force transmitted to the valve rod is also large. If the diameter of the valve rod is small, the machined flat square or square is also small, and the valve rod can be deformed or twisted off in the driving process. In order to ensure that the valve rod is not damaged in the driving process, the diameter of the valve rod needs to be increased, so that the material cost is increased.

The Chinese utility model with publication number CN203703215U discloses a valve rod eccentric positioning ball valve, wherein a fixed shaft is arranged at the bottom of a valve body, a valve seat is arranged in the valve body, a ball body is arranged in the valve body and above the fixed shaft, a middle valve body is arranged at two ends of the top of the ball body, a valve rod is arranged between the middle valve body and inserted into the ball body from the top of the ball body, the valve rod and the ball body are on the same central axis, the top of the valve rod is provided with a worm gear device, the valve rod is sleeved with a connecting disc, the two ends of the outer side of the connecting disc are provided with stuffing boxes, the contact part between the valve rod and the ball body is connected by a cylindrical connecting piece, the center of the cylindrical connecting piece is not on the same central axis with the central axes of the valve rod and the ball body, the valve rod eccentric location that this scheme adopted has utilized the cylindricality connecting piece to fix a position the spheroid, has decomposed the stress concentration point of valve, nevertheless drive stroke improves limitedly, and steady reliability is not enough.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an eccentric shaft connection structure of ball valve spheroid valve rod, valve rod have big cylinder and eccentric little cylinder, and eccentric structure's valve rod is fine with spheroidal eccentric hole structure coincide, compact structure, and eccentric shaft cross sectional area is big, and the power of transmission is also big, and ball valve spheroid switching process is steady, and valve rod eccentric shaft non-deformable is obvious than traditional structure advantage with destroying.

In order to achieve the above purpose, the present invention adopts the following technical solution.

The utility model discloses an eccentric shaft connecting structure of a ball valve rod, which comprises a valve body, a ball body, a valve rod, a worm wheel and a stuffing box, and also comprises a bottom cover, a bearing I, a bearing II, a plane bearing, a stuffing cover and a bracket; the valve rod is of an eccentric structure and is assembled and connected with the valve body, the ball body, the bottom cover, the bearing I, the bearing II, the plane bearing, the packing box, the packing gland, the support and the worm wheel.

Preferably, the valve body is a hollow cylinder, and the ball is placed in the cylindrical cavity of the valve body.

In any of the above solutions, preferably, the lower end of the ball is fitted with a bearing I.

In any of the above technical solutions, preferably, the bearing I is sleeved on an outer cylindrical surface of the bottom cover, and the bottom cover is fixed on the valve body through a stud I and a nut I.

In any of the above technical solutions, preferably, a sealing gasket I is disposed between the bottom cover and the valve body.

In any of the above solutions, it is preferable that the valve stem has a large cylinder and an eccentric small cylinder.

In any of the above technical solutions, preferably, the large cylinder and the eccentric small cylinder of the valve rod are inserted into the large cylinder hole and the eccentric small cylinder hole of the ball body, respectively, and the outer circle is sleeved in the bearing II, and the bearing II is disposed in the upper end hole of the valve body.

In any of the above solutions, preferably, the stuffing box is fixed to the valve body by screws.

In any of the above technical solutions, it is preferable that a sealing gasket II is installed between the stuffing box and the valve body.

In any of the above solutions, it is preferable that the valve stem has a shoulder that contacts the flat bearing and the stuffing box.

In any of the above technical solutions, preferably, a packing is placed between the packing box and the valve rod, and the packing gland compresses the packing through a stud IV and a nut IV.

In any of the above technical solutions, preferably, the lower end of the bracket is placed on the stuffing box and fixed thereto by a stud II and a nut II.

In any of the above technical solutions, preferably, the upper end of the bracket is connected with a worm wheel and fixed by a stud III and a nut III.

In any of the above solutions, it is preferable that the worm wheel and the valve stem are connected by a flat key.

The utility model discloses an eccentric shaft connection structure of ball valve spheroid valve rod, mainly by the valve body, the spheroid, the bottom, the valve rod, bearing I, bearing II, the plane bearing, the packing box, gland, a support, the worm wheel is connected and is constituted, the valve rod has big cylinder and eccentric little cylinder, the big cylinder and the eccentric little cylinder of valve rod correspond respectively and insert spheroidal big cylinder hole and eccentric little cylinder hole, the excircle overlaps in bearing II, bearing II installs in the upper end of valve body downthehole, eccentric structure's valve rod and the fine coincidence of spheroidal eccentric orifice structure, compact structure, eccentric shaft cross sectional area is big, the power of transmission is also big, ball valve spheroid switching process is steady. In addition, in the connection structure of the utility model, the lower end of the ball body is matched with the bearing I, and the bearing I7 plays a role in reducing friction force in the rotation process of the ball body 2; a sealing gasket I is arranged between the bottom cover and the valve body and is sealed to prevent the medium from leaking; a sealing gasket II is arranged between the stuffing box and the valve body, so that the medium can be prevented from leaking outside; the shoulder of the valve rod is contacted with the plane bearing and the stuffing box, when the pressure of an internal medium rises, the valve rod 8 moves upwards, the shoulder of the valve rod 8 is contacted with the plane bearing 10 and then contacted with the stuffing box 12, the plane bearing 10 reduces friction force, the stuffing box 12 prevents the valve rod 8 from flying out under the action of pressure, the stud IV 23 and the nut IV 24 press the force on the stuffing 14 through the stuffing gland 17, and the compressed stuffing 14 can prevent the medium from leaking out of the stuffing 14.

In the prior art, the diameter of the valve rod is small, the processed flat square or square is also small, the valve rod can be deformed or twisted off in the driving process, and if the valve rod is not damaged in the driving process, the diameter of the valve rod needs to be increased, so that the material cost is increased. Compared with the prior art, the above technical scheme of the utility model, valve rod (8) eccentric shaft non-deformable and destruction, this kind of structural design is obvious with the technological effect advantage of bringing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural view of a preferred embodiment of an eccentric shaft connecting structure of a ball valve stem according to the present invention;

fig. 2 is an enlarged schematic view of the valve stem portion of the embodiment shown in fig. 1 of the eccentric shaft connecting structure of the ball valve stem according to the present invention;

fig. 3 is an enlarged sectional view of the valve stem portion of the embodiment shown in fig. 1 of the eccentric shaft connecting structure of the ball valve stem according to the present invention;

fig. 4 is a schematic view of the valve stem axial projection of the embodiment shown in fig. 1 of the eccentric shaft connecting structure of the ball valve stem according to the present invention.

Reference numerals: 1. the valve comprises a valve body, 2, a ball body, 3, sealing gaskets I, 4, a bottom cover, 5, nuts I, 6, studs I, 7, bearings I, 8, a valve rod, 9, bearings II, 10, a plane bearing, 11, sealing gaskets II, 12, a stuffing box, 13, a screw, 14, stuffing, 15, studs II, 16, nuts II, 17, a stuffing gland, 18, a support, 19, studs III, 20, nuts III, 21, a worm wheel, 22, a flat key, 23, studs IV, 24, nuts IV, 25, a spring washer, 26, a large cylinder, 27, a large cylinder hole, 28, a small cylinder, 29, a small cylinder hole, 30, axes I, 31, axes II, 32, center lines I, 33 and center lines II.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

For the utility model discloses the embodiment provides an eccentric shaft connection structure of ball valve spheroid valve rod, valve rod eccentric shaft non-deformable and destruction can overcome the valve rod that ball valve spheroid valve rod structure exists among the prior art and can warp or twist off, increase valve rod diameter size increase material cost scheduling problem in the driving process.

The embodiment of the utility model provides an eccentric shaft connecting structure of ball valve spheroid valve rod, as shown in fig. 1, including valve body 1, spheroid 2, valve rod 8, worm wheel 21 and packing box 12 to and including bottom 4, bearing I7, bearing II 9, flat bearing 10, gland 17 and support 18, wherein, valve rod 8 is eccentric structure.

The structure, characteristics and operation principle of the present embodiment will be described in detail with reference to fig. 1 to 4.

In the eccentric shaft connecting structure of the ball valve body valve rod of the ball valve, the valve body 1 is a hollow cylinder, and the ball body 2 is placed in a cylindrical cavity of the valve body 1; the lower end of the ball body 2 is matched with a bearing I7; the bearing I7 is sleeved on the outer cylindrical surface of the bottom cover 4, and the bottom cover 4 is fixed on the valve body 1 through a stud I6 and a nut I5.

In the eccentric shaft connecting structure of the ball valve rod of the ball valve of the embodiment, a sealing gasket I3 is arranged between the bottom cover 4 and the valve body 1.

In the eccentric shaft connecting structure of the ball valve rod of the ball valve, the valve rod 8 is provided with a large cylinder 26 and an eccentric small cylinder 28; the large cylinder 26 and the eccentric small cylinder 28 of the valve rod 8 are respectively and correspondingly inserted into the large cylinder hole 27 and the eccentric small cylinder hole 29 of the ball body 2, the outer circle is sleeved in the bearing II 9, and the bearing II 9 is arranged in the upper end hole of the valve body 1.

In the eccentric shaft connecting structure of the ball valve rod of the embodiment, the stuffing box 12 is fixed on the valve body 1 through the screw 13; a sealing gasket II 11 is arranged between the stuffing box 12 and the valve body 1.

In the eccentric shaft connecting structure of the ball valve body valve rod of the ball valve, the valve rod 8 is provided with a convex shoulder which is contacted with a plane bearing 10 and a stuffing box 12.

In the eccentric shaft connecting structure of the ball valve rod of the ball valve, the packing 14 is arranged between the packing box 12 and the valve rod 8, and the packing gland 17 compresses the packing 14 through the stud IV 23 and the nut IV 24.

In the eccentric shaft connecting structure of the ball valve rod of the present embodiment, the lower end of the support 18 is placed on the stuffing box 12 and fixed with the stuffing box through the stud II 15 and the nut II 16.

In the eccentric shaft connecting structure of the ball valve rod of the ball valve, the upper end of the bracket 18 is connected with a worm wheel 21 and fixed through a stud III 19 and a nut III 20.

In the eccentric shaft connecting structure of the ball valve rod of the ball valve, the worm wheel 21 and the valve rod 8 are connected through the flat key 22.

The eccentric shaft connecting structure of the ball valve rod of the ball valve of the embodiment, between the stud II 15 and the nut II 16, and between the stud III 19 and the nut III 20, can be provided with spring washers 25.

In the eccentric shaft connecting structure of the ball valve stem of the ball valve, which is formed by assembling and connecting the valve stem 8 with the valve body 1, the ball 2, the bottom cover 4, the bearing I7, the bearing II 9, the plane bearing 10, the stuffing box 12, the stuffing gland 17, the bracket 18 and the worm wheel 21, as shown in FIG. 2, the outer surface of the large cylinder 26 of the valve stem 8 is in contact with and supported in the bearing II 9, the large cylinder 26 of the valve stem 8 is limited from moving radially, and the bearing II 9 is placed in the valve body 1. The large cylinder 26 of the valve stem 8 is inserted into the large cylinder bore 27 of the ball 2 and the small cylinder 28 of the valve stem 8 is inserted into the small cylinder bore 29 of the ball 2. As shown in the partial section of the sphere 2 in FIG. 3, the axis I30 of the large cylindrical hole 27, the axis II 31 of the small cylindrical hole 29, and the axis II 31 are not collinear with the axis I30, so that the large cylindrical hole 27 and the small cylindrical hole 29 are eccentric. As shown in the axial projection of the valve rod 8 in FIG. 4, the central line I32 of the large cylinder 26 is not collinear with the central line II 33 of the small cylinder 28, so that the valve rod 8 is in an eccentric structure. Big cylinder 26 of valve rod 8 fixes spheroid 2's big cylinder hole 27, external force lets it rotatory on the big cylinder 26 of valve rod 8, big cylinder 26 is integrative with little cylinder 28, big cylinder 26 transmits power to little cylinder 28, little cylinder 28 of valve rod 8 is rotatory around big cylinder 26 axis, the surface large tracts of land of the little cylinder 28 of valve rod 8 contacts with spheroid 2's little cylinder hole 29, make power transmission again transmit spheroid 2's little cylinder hole 29, it is rotatory to make spheroid 2 rotate around spheroid 2's big cylinder hole 27's axis I30, play the effect of switch valve. The small cylinder 28 of the valve rod 8 has a larger cross-sectional area and a larger transmission force. The material cost is reduced under the condition of guaranteeing that the valve rod 8 does not damage in normal operation, and the valve structure is optimized.

As shown in fig. 1, the valve body 1 is a hollow cylinder, and is the main body structure of the valve of the present embodiment, and the ball 2 is placed in the cylindrical cavity of the valve body 1. The lower end of the ball body 2 is matched with the bearing I7, and the bearing I7 can play a role in reducing friction force in the rotating process of the ball body 2. The bearing I7 is sleeved on the outer cylindrical surface of the bottom cover 4, and the bottom cover 4 is fixed on the valve body 1 through a stud I6 and a nut I5. A sealing gasket I3 is arranged between the bottom cover 4 and the valve body 1 for sealing, and the medium is prevented from leaking. The large cylinder 26 and the eccentric small cylinder 28 of the valve rod 8 are inserted into the large cylinder hole 27 and the eccentric small cylinder hole 29 of the ball body 2, the outer circle is sleeved in the bearing II 9, and the bearing II 9 is arranged in the upper end hole of the valve body 1. The stuffing box 12 is fixed on the valve body 1 through a screw 13, and a sealing gasket II 11 is arranged between the stuffing box 12 and the valve body 1, so that the medium can be prevented from leaking from the position. The valve rod 8 is provided with a convex shoulder, when the pressure of an internal medium rises, the valve rod 8 moves upwards, the convex shoulder of the valve rod 8 is contacted with the plane bearing 10 and then contacted with the stuffing box 12, the plane bearing 10 reduces the friction force, and the stuffing box 12 prevents the valve rod 8 from flying out under the action of pressure. The packing 14 is placed between the stuffing box 12 and the valve stem 8, the stud IV 23 and the nut IV 24 press the force on the packing 14 through the packing gland 17, and the packed packing 14 can prevent the medium from leaking out of the packing. The lower end of the bracket 18 is placed on the stuffing box 12 and is fixed with the stuffing box through a stud II 15 and a nut II 16; the upper end of the bracket 18 is connected with a worm wheel 21 and fixed by a screw bolt III 19 and a nut III 20. The worm wheel 21 and the valve stem 8 are connected by a flat key 22. In this embodiment, the spring washer 25 functions to prevent nut slack failure.

By adopting the eccentric shaft connecting structure of the ball valve rod of the embodiment, the action process is that external force acts on the hand wheel of the worm wheel 21, the worm wheel in the worm wheel 21 drives the flat key 22 and the valve rod 8 to rotate together, and the eccentric shaft at the lower end of the valve rod 8 drives the ball 2 to rotate. A single rotation of 90 is an on or off process. The eccentric shaft structure of the lower end of the valve rod 8 is well matched with the eccentric hole structure of the ball body 2, the structure is compact, the section area of the eccentric shaft is large, the transmitted force is also large, the opening and closing process is stable, the eccentric shaft of the valve rod 8 is not easy to deform and damage, and the advantages of the eccentric shaft structure and the eccentric hole structure are obvious compared with the advantages of a traditional structure.

The above description is only intended to describe the preferred embodiments of the present invention, and not to limit the scope of the present invention; the above description is only a specific embodiment of the present invention, and is not intended to limit the scope of the present invention; without departing from the spirit of the present invention, any modification, equivalent replacement, or improvement made by the technical solution of the present invention by those of ordinary skill in the art should fall within the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides an eccentric shaft connection structure of ball valve spheroid valve rod, includes valve body (1), spheroid (2), valve rod (8), worm wheel (21) and packing box (12), its characterized in that still includes bottom (4), bearing I (7), bearing II (9), flat face bearing (10), packing gland (17) and support (18), valve rod (8) are eccentric structure, valve rod (8) and valve body (1), spheroid (2), bottom (4), bearing I (7), bearing II (9), flat face bearing (10), packing box (12), packing gland (17), support (18), worm wheel (21) be assembled between/be connected between.

2. Eccentric shaft connection for a ball valve stem of a ball valve according to claim 1, characterized in that the valve body (1) is a hollow cylinder and the ball (2) is placed in the cylindrical cavity of the valve body (1).

3. Eccentric shaft connection for the ball valve stem of a ball valve according to claim 2, characterised in that the lower end of the ball (2) cooperates with a bearing I (7).

4. The eccentric shaft connecting structure of the ball valve rod of the ball valve according to claim 3, characterized in that the bearing I (7) is sleeved on the outer cylindrical surface of the bottom cover (4), and the bottom cover (4) is fixed on the valve body (1) through a stud I (6) and a nut I (5).

5. The eccentric shaft connecting structure of the ball valve stem of a ball valve according to claim 4, characterized in that a sealing gasket I (3) is provided between the bottom cover (4) and the valve body (1).

6. Eccentric shaft connection of a ball valve stem according to claim 5, characterized in that the valve stem (8) has a large cylinder (26) and a small eccentric cylinder (28).

7. The eccentric shaft connecting structure of the ball valve rod of the ball valve according to claim 6, characterized in that the large cylinder (26) and the small eccentric cylinder (28) of the valve rod (8) are inserted into the large cylinder hole (27) and the small eccentric cylinder hole (29) of the ball (2) respectively, the outer circle is sleeved in the bearing II (9), and the bearing II (9) is arranged in the upper end hole of the valve body (1).

8. Eccentric shaft connection for the ball valve stem of a ball valve according to claim 1, characterised in that the stuffing box (12) is fixed to the valve body (1) by means of screws (13).

9. The eccentric shaft connecting structure of the ball valve stem of a ball valve according to claim 8, characterized in that a sealing gasket II (11) is installed between the stuffing box (12) and the valve body (1).

10. Eccentric shaft connection of a ball valve stem according to claim 1, characterized in that the stem (8) has a shoulder which is in contact with the flat bearing (10), the stuffing box (12).

11. The eccentric shaft connecting structure of the ball valve stem of a ball valve according to claim 1, characterized in that a packing (14) is placed between the stuffing box (12) and the valve stem (8), and the packing gland (17) compresses the packing (14) through a stud IV (23) and a nut IV (24).

12. The eccentric shaft connecting structure of a ball valve stem of a ball valve according to claim 1, wherein the lower end of the bracket (18) is placed on the stuffing box (12) and fixed with the stuffing box through a stud II (15) and a nut II (16).

13. The eccentric shaft connecting structure of the ball valve stem of the ball valve according to claim 12, wherein the upper end of the bracket (18) is connected with a worm wheel (21) and fixed by a stud III (19) and a nut III (20).

14. Eccentric shaft connection of a ball valve stem according to claim 1, characterized in that the worm wheel (21) and the valve stem (8) are connected by a flat key (22).