CN214197528U

CN214197528U - Gate valve gap structure

Info

Publication number: CN214197528U
Application number: CN202023162462.3U
Authority: CN
Inventors: 金国良; 钟斌
Original assignee: Ningbo Amico Copper Valves Manufacturing Co Ltd
Current assignee: Ningbo Amico Copper Valves Manufacturing Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-09-14
Anticipated expiration: 2030-12-25

Abstract

The utility model discloses a gate valve cover structure, which comprises a valve cover, a valve rod, a hand wheel and the like, wherein a convex shaft which has the same axle center with the valve rod is arranged on the valve rod, the convex shaft is rotationally assembled in a positioning hole of the valve cover, an inner shoulder which is used for positioning the top of the convex shaft and limiting the valve rod to move upwards is arranged at the upper end of the positioning hole, and a riveting necking which is used for positioning the bottom of the convex shaft and limiting the valve rod to move downwards is arranged at the lower end of the positioning hole; therefore, the traditional nut or collar fixation is replaced by the vertical positioning of the inner shoulder and the riveting necking, so that the number of assembly parts can be effectively reduced, the assembly process is simplified, the production cost is reduced, and the assembly efficiency is improved. Meanwhile, the packing is arranged between the valve rod and the top of the valve cover, and the O-shaped ring is arranged between the outer circumferential surface of the convex shaft and the inner circumferential surface of the positioning hole, so that the valve rod has double-layer rotary sealing, the sealing performance between the valve cover and the valve rod can be effectively ensured, the mounting position of the valve rod is well positioned and restrained, the smooth rotation of the valve rod in the valve cover cannot be influenced, and the use is more reliable.

Description

Gate valve gap structure

Technical Field

The utility model relates to a valve gap structure, a gate valve gap structure promptly.

Background

The gate valve is used as a common valve in a pipeline and is widely applied to a municipal water supply system, the structure of the gate valve mainly comprises a valve body, a valve cover, a valve rod, a gate plate, a hand wheel and the like, the valve cover is hermetically installed in an installation hole at the top of the valve body, the upper end of the valve rod extends out of the valve cover installation hand wheel, the lower end of the valve rod penetrates through a valve rod hole in the valve cover and extends into the valve body to be connected with the gate plate, and the gate plate can be driven to lift and open and close the gate valve only by driving the valve rod to rotate forwards and backwards through the hand wheel during use. Therefore, the valve cover is not only used for positioning and restraining the installation position of the valve rod, but also cannot influence the smooth rotation of the valve rod in the valve cover. The traditional assembly mode of the valve cover and the valve rod is mainly characterized in that after the valve rod is inserted into the upper end or the lower end of the valve cover, the valve rod is fixed with the valve cover by using a nut or a clamping ring, and the assembly mode has the defects of more parts, high production cost, complex assembly process, low assembly efficiency, poor use reliability and the like. Moreover, graphite is usually filled between the valve cover and the valve rod to realize single-layer sealing, so that the valve rod is easy to rub with fillers during rotation to influence operation, and the valve is easy to leak water due to abrasion of the fillers after long-time use.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome prior art's defect and provide one kind and reduce assembly spare part, simplify assembly process, reduction in production cost, improve assembly efficiency to and can better guarantee sealing performance and use the gate valve gap structure of reliability.

The technical problem of the utility model is realized through following technical scheme:

the utility model provides a gate valve gap structure, includes that the valve gap of seal installation in valve body top mounting hole and the valve rod of rotary seal installation in the valve gap, this valve rod upper end stretches out valve gap installation hand wheel, and the valve rod lower extreme stretches into valve body connection flashboard, the valve rod on be equipped with the protruding axle of axle center with the valve rod, this protruding axle rotates to be furnished with in the locating hole of valve gap, and the locating hole upper end is equipped with the protruding axle top of location and limits the interior shoulder of valve rod rebound, the locating hole lower extreme is equipped with the protruding axle bottom of location and limits the riveting throat of valve rod rebound.

The riveting necking is formed by the fact that a riveting boss protruding from the lower end of the positioning hole is stressed to be inclined inwards and deformed.

The deformation angle alpha of the riveting necking inclined inwards under stress is 45-60 degrees.

The riveting boss is an annular boss coaxial with the positioning hole, and the thickness of the riveting boss is 1.8 mm-2 mm.

A packing for forming rotary sealing of the valve rod is arranged between the valve rod and the top of the valve cover; an O-shaped ring for forming rotary sealing of the valve rod is arranged between the outer circumferential surface of the convex shaft and the inner circumferential surface of the positioning hole.

A valve rod hole which is vertically communicated along the axial lead of the valve cover is arranged in the valve cover, and the valve rod hole is composed of a filling hole at the top of the valve cover, a middle hole in the middle of the valve cover and a positioning hole at the bottom of the valve cover; the valve rod is rotatably and hermetically arranged in the valve rod hole.

The filler hole is an inverted cone hole, the middle hole and the positioning hole are both cylindrical holes, and the aperture of the middle hole is smaller than that of the positioning hole.

The packing is arranged in the packing hole, the height of the packing is higher than that of the packing hole, and the packing is extruded and deformed by a compression nut connected to the top of the valve cover and is filled between the packing hole and the valve rod.

The outer circumference of the convex shaft is provided with an annular groove which is coaxial with the convex shaft, the O-shaped ring is embedded and fixed in the annular groove, and the O-shaped ring is contacted with the inner circumference surface of the positioning hole.

The filler material is polytetrafluoroethylene, and the O-shaped ring material is ethylene propylene diene monomer.

Compared with the prior art, the utility model is mainly characterized in that a convex shaft which is coaxial with the valve rod is arranged on the valve rod, the convex shaft is rotatably assembled in a positioning hole of the valve cover, an inner shoulder which is used for positioning the top of the convex shaft and limiting the valve rod to move upwards is also arranged at the upper end of the positioning hole, and a riveting necking which is used for positioning the bottom of the convex shaft and limiting the valve rod to move downwards is arranged at the lower end of the positioning hole; therefore, the traditional nut or collar fixing mode is replaced by the upper and lower positioning structures of the inner shoulder and the riveting necking, and obviously, the assembly parts can be effectively reduced, the assembly process is simplified, the production cost is reduced, and the assembly efficiency is improved. Meanwhile, a packing for forming the rotary seal of the valve rod is arranged between the valve rod and the top of the valve cover, and an O-shaped ring for forming the rotary seal of the valve rod is also arranged between the outer circumferential surface of the convex shaft and the inner circumferential surface of the positioning hole.

Drawings

Fig. 1 is a schematic sectional view of the present invention.

Fig. 2 is an enlarged sectional view of the valve cover (caulking and necking state).

Fig. 3 is an enlarged sectional view of the valve cover (a state of caulking the boss).

Fig. 4 is a schematic view of the valve stem.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in fig. 1-4, the valve comprises a valve body 1, a valve cover 2, a riveting necking 21, a riveting boss 22, an inner shoulder 23, a valve rod 3, a protruding shaft 31, an annular groove 32, a transmission threaded shaft 33, a gland nut 4, a hand wheel 5, a packing 6, an O-shaped ring 7, a flashboard 8, a valve rod hole 9, a packing hole 91, a middle hole 92 and a positioning hole 93.

The utility model provides a valve gap structure, as shown in figure 1, mainly relates to the valve gap design of gate valve among water supply pipe system, and its structure includes valve gap 2 and the valve rod 3 of rotating the sealed installation in valve gap 2 of seal installation in the mounting hole in valve body 1 top, and this valve rod upper end stretches out valve gap 2 installation hand wheel 5, and the drive threaded shaft 33 is established to valve rod 3 lower extreme, and this drive threaded shaft stretches into valve body 1 threaded connection flashboard 8.

The valve rod hole 9 is formed in the valve cover 2 and penetrates up and down along the axial lead of the valve cover, and can be used for rotating, sealing and mounting the valve rod 3, the valve rod hole 9 is formed by a filling hole 91 in the top of the valve cover, a middle hole 92 in the middle of the valve cover and a positioning hole 93 in the bottom of the valve cover, the filling hole 91 is an inverted cone hole, and the middle hole 92 and the positioning hole 93 are cylindrical holes; the diameter of the lower end of the filling hole 91 is the same as that of the middle hole 92, and the diameter of the middle hole 92 is smaller than that of the positioning hole 93, so that the middle hole and the positioning hole just form a stepped hole.

The valve rod 3 is provided with a cylindrical protruding shaft 31 which is coaxial with the valve rod, the protruding shaft is rotatably assembled in a positioning hole 93 of the valve cover 2, clearance fit is formed between the cylindrical protruding shaft 31 and the positioning hole 93, the upper end of the positioning hole 93 is provided with an inner shoulder 23 which is used for positioning the top of the protruding shaft 31 and limiting the upward movement of the valve rod 3, the inner shoulder is actually a step formed at the intersection of the middle hole 92 and the positioning hole 93, and the lower end of the positioning hole 93 is provided with a riveting necking 21 which is used for positioning the bottom of the protruding shaft 31 and limiting the downward movement of the valve rod 3. Obviously, the traditional nut or collar fixing mode is replaced by the upper and lower positioning structures of the inner shoulder 23 and the riveting necking 21, so that the assembly parts can be effectively reduced, the assembly process can be simplified, the production cost can be reduced, and the assembly efficiency can be improved.

The riveting necking 21 is formed by the fact that a riveting boss 22 protruding from the lower end of a positioning hole 93 is simultaneously stressed and inwards inclined and deformed through a die, the stressed inwards inclined deformation angle alpha of the riveting necking 21 is 45-60 degrees, the riveting boss 22 is an annular boss coaxial with the positioning hole 93, the thickness of the riveting boss 22 is usually 1.8-2 mm, and the dimensional data are mainly used for guaranteeing the use reliability of the riveting boss 22 when the riveting boss 22 is deformed into the riveting necking 21, the root of the riveting boss 22 is torn when the riveting boss 22 is deformed due to too thin thickness, the strength is insufficient, the deformation of the riveting boss 22 is insufficient due to too thick thickness, and the valve rod 3 accidentally falls off from a valve rod hole 9.

Simultaneously, be equipped with between valve rod 3 and the valve gap 2 top and constitute valve rod rotary seal's filler 6, this filler material is polytetrafluoroethylene, and the concrete structure is: the packing 6 is the identical setting in the filler hole 91 of back taper form, so the tapering of packing is the same with the tapering in back taper hole, and the packing 6 after the installation highly need be higher than the filler hole 91, then extrudees by gland nut 4 of threaded connection at valve gap 2 top to make packing 6 warp along the filler hole 91 and pack and realize sealedly between filler hole and valve rod 3.

An O-ring 7 for forming a rotary seal of the valve rod 2 is also arranged between the outer circumferential surface of the protruding shaft 31 and the inner circumferential surface of the positioning hole 93, the O-ring is made of ethylene propylene diene monomer, and the specific structure is as shown in fig. 4: an annular groove 32 coaxial with the protruding shaft 31 is arranged on the outer circumferential surface of the protruding shaft 31, the O-shaped ring 7 is fixedly embedded in the annular groove 32, and the O-shaped ring 7 which is embedded in place is simultaneously contacted with the inner circumferential surface of the positioning hole 93, so that the protruding shaft 31 and the positioning hole 93 are sealed.

Obviously, the double-layer sealing structure replaces the traditional single-layer graphite sealing structure to more effectively ensure the sealing performance between the valve cover 2 and the valve rod 3, not only can better position and restrain the installation position of the valve rod, but also can not influence the smooth rotation of the valve rod in the valve cover, and is more reliable in use.

The above description is only an embodiment of the present invention, and those skilled in the art should understand that any structural design similar to the embodiment is included in the protection scope of the present invention.

Claims

1. The utility model provides a gate valve gap structure, includes valve gap (2) and the valve rod (3) of rotating the sealed installation in valve gap (2) of seal installation in valve body (1) top mounting hole, this valve rod upper end stretches out valve gap (2) installation hand wheel (5), and valve rod (3) lower extreme stretches into valve body (1) and connects flashboard (8), its characterized in that valve rod (3) on be equipped with protruding axle (31) with the axle center with the valve rod, this protruding axle rotates to be assembled in locating hole (93) of valve gap (2), and the locating hole upper end is equipped with location protruding axle (31) top and limits interior shoulder (23) of valve rod (3) rebound, locating hole (93) lower extreme is equipped with location protruding axle (31) bottom and limits riveting throat (21) of valve rod (3) rebound.

2. The gate valve cover structure of claim 1, wherein the rivet neck (21) is formed by a rivet projection (22) protruding from the lower end of the positioning hole (93) and being deformed by being simultaneously pressed inward and inclined.

3. The gate valve bonnet structure as claimed in claim 2, wherein the rivet necking (21) is forced to be inclined inward by a deformation angle α of 45 ° to 60 °.

4. The gate valve cover structure of claim 2, wherein the riveting boss (22) is an annular boss coaxial with the positioning hole (93), and the thickness of the riveting boss (22) is 1.8 mm-2 mm.

5. A gate valve cover structure according to claim 1, characterized in that a packing (6) for forming a rotary seal of the valve rod (3) is arranged between the valve rod (3) and the top of the valve cover (2); an O-shaped ring (7) forming rotary sealing of the valve rod (3) is arranged between the outer circumferential surface of the convex shaft (31) and the inner circumferential surface of the positioning hole (93).

6. The gate valve cover structure of claim 1, characterized in that the valve cover (2) is provided with a valve rod hole (9) which is vertically communicated along the axis of the valve cover, and the valve rod hole is composed of a filling hole (91) at the top of the valve cover (2), a middle hole (92) at the middle part of the valve cover (2) and a positioning hole (93) at the bottom of the valve cover (2); the valve rod (3) is rotatably and hermetically arranged in the valve rod hole (9).

7. The gate valve cover structure of claim 6, wherein the filling hole (91) is an inverted cone hole, the middle hole (92) and the positioning hole (93) are both cylindrical holes, and the diameter of the middle hole (92) is smaller than that of the positioning hole (93).

8. A gate valve cover structure according to claim 5 or 6, characterized in that the packing (6) is disposed in the packing hole (91), the packing (6) is higher than the packing hole (91), and is packed between the packing hole (91) and the valve stem (3) by being compression-deformed by a compression nut (4) attached to the top of the valve cover (2).

9. The gate valve cover structure of claim 5, wherein the outer circumference of the protruding shaft (31) is provided with a ring groove (32) coaxial with the protruding shaft, the O-ring (7) is embedded and fixed in the ring groove (32), and the O-ring (7) is simultaneously contacted with the inner circumference of the positioning hole (93).

10. The gate valve cover structure according to claim 5, wherein the filler (6) is made of polytetrafluoroethylene, and the O-ring (7) is made of ethylene propylene diene monomer.