CN210164914U

CN210164914U - Large-drift-diameter swing type waterproof hammer stop valve

Info

Publication number: CN210164914U
Application number: CN201921018789.8U
Authority: CN
Inventors: 杨伟; 李春光; 尤成达
Original assignee: MINGZHU VALVE GROUP CO Ltd
Current assignee: MINGZHU VALVE GROUP CO Ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-03-20
Anticipated expiration: 2029-07-02

Abstract

The utility model provides a waterproof hammer stop valve of big latus rectum swing, includes: the valve rod is arranged in a central channel of the valve cover in series, the upper end of the valve rod is connected with an umbrella gear box controlled by a hand wheel, the lower end of the valve rod penetrates through the valve cover and forms a main interception structure of a valve body flow channel with a valve seat arranged in an inner cavity of the valve body, the valve clack assembly consists of a large valve clack and a small valve clack sleeved in the large valve clack, the small valve clack is directly and fixedly connected with the lower end of the valve rod into a whole, and an intercepted auxiliary sealing surface is formed on a contact surface of the small valve clack and the large valve clack; the end part of the big valve clack is provided with a gland nut, the small valve clack can synchronously move in the inner cavity of the big valve clack formed by the big valve clack and the gland nut along with the lifting motion of the valve rod, and forms a main sealing surface for intercepting in a valve body flow passage together with the valve seat; and a cantilever type check valve clack mechanism is additionally arranged in the valve body inner cavity at the output end of the valve body inner cavity, and a check sealing surface for preventing the impact of a return water hammer is formed by the cantilever type check valve clack mechanism.

Description

Large-drift-diameter swing type waterproof hammer stop valve

Technical Field

The utility model relates to a valve, especially a waterproof hammer of heavy-calibre ends swing check valve.

Background

In some pipelines with larger nominal size (more than or equal to DN450) or faster flow rate (more than or equal to 5m/s) in the liquid pipeline, when the switch valve cuts off the liquid medium, part of the pipeline medium flows back from the outlet pipeline after a period of time, under the action of inertia, the water power quickly reaches the maximum, the seal pair of the valve is impacted, the light person can not ensure the seal, the heavy person has the crack of the seal surface, and the valve rod is bent; the valves (such as gate valves, stop valves, throttle valves, butterfly valves and the like) of the single sealing pair can be directly scrapped; the valve (such as ball valve, etc.) of the double sealing pair can keep sealing, but the service life can be greatly influenced.

Therefore, how to solve the problem that the valve in the pipeline with larger nominal size (more than or equal to DN450) or faster flow rate (more than or equal to 5m/s) is damaged by the water hammer is a new problem for improving the valve by a valve manufacturer, wherein the valve provided with safer and more reliable service performance is provided.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose of the invention: the medium-large-drift-diameter swing type waterproof hammer stop valve can be used in pipelines with large nominal size (greater than or equal to DN450) or high flow speed (greater than or equal to 5m/s), and can effectively solve the problems existing in the use of the existing pipeline system.

The utility model provides a waterproof hammer stop valve of big latus rectum swing, includes: valve body 1, valve rod 5, valve gap 11 and valve clack subassembly, valve rod 5 cluster put in the central channel of valve gap 11, its upper end is connected with bevel gear case 12 that is controlled by the hand wheel, its lower extreme constitutes the main structure of damming of valve body runner, its characterized in that through the valve gap of locating the tip with the disk seat A of locating 1 inner chamber of valve body: the valve clack assembly consists of a large valve clack 2 and a small valve clack 3 sleeved in the large valve clack 2, the small valve clack 3 is directly and fixedly connected with the lower end part of the valve rod into a whole, and an intercepted auxiliary sealing surface 25 is formed on the contact surface of the small valve clack 3 and the large valve clack 2; the end part of the big valve clack 2 is provided with a gland nut 4, the small valve clack 3 can synchronously move in the inner cavity of the big valve clack formed by the big valve clack 2 and the gland nut 4 along with the lifting movement of the valve rod 5, and forms an intercepting main sealing surface 26 in a valve body flow passage together with the valve seat A; and meanwhile, a cantilever type check valve clack mechanism is additionally arranged in the inner cavity of the valve body 1 at the output end of the inner cavity of the valve body 1, and a check sealing surface 27 for preventing backflow liquid from forming water hammer impact in the valve body is formed by the cantilever type check valve clack mechanism.

Preferably, the big valve clack 2 is U-shaped, the valve body of its periphery is equipped with the discharge orifice B that the slant set up all around, and the bottom of big valve clack 2 is equipped with the discharge orifice C that is linked up mutually with the lower part of valve body 1 through-flow channel.

Preferably, the cantilever type check valve clack mechanism consists of a check valve clack 21 and a rocker arm 22, the upper end of the rocker arm 22 is in cantilever type connection with the inner cavity of the valve body through a hinge mechanism, and the check valve clack 21 is fixedly connected with the rocker arm 22 into a whole through a nut 23.

Preferably, the bottom of the valve body 1 is provided with a drain plug screw 24.

This kind of large latus rectum swing type waterproof hammer stop valve that provides according to above technical scheme has following characteristics:

1) protection structure with water hammer and main valve flap

When the valve on a pipeline with larger nominal size (more than or equal to DN450) or faster flow speed (more than or equal to 5m/s) is used, the large-drift-diameter swing type water hammer prevention stop valve can prevent the main valve flap from being not closed tightly due to the impact of a water hammer on the main valve flap when the check valve flap is closed, and can also effectively prevent the sealing surface of the main valve flap from being damaged and the valve rod from deforming.

2) Self-unloading structure with valve cavity

The large-drift-diameter swing type water hammer-proof stop valve consists of two valve clacks, a closed middle cavity structure is formed between the two valve clacks, and when the pressure of the middle cavity needs to be relieved; this waterproof hammer stop valve of big latus rectum swing-type, the check valve clack can open automatically and unload pressure when taking place this kind of condition.

3) With low load structure

The large-drift-diameter swing type waterproof hammer stop valve is provided with a double-valve-clack structure, when the valve is opened, a valve rod rotates anticlockwise, a small valve clack moves upwards, and the pressure difference of an inlet and an outlet of the valve is reduced, so that the valve can be opened easily; the pressure of a medium can be effectively utilized for assisting sealing, and the load of the valve rod is reduced;

4) has a sewage discharge structure

When the system is maintained, the pressure in the pipeline is released, the blowdown plug screw is unscrewed, the sealing gasket is taken down, the sediment is discharged, and the sealing gasket and the blowdown plug screw are cleaned and screwed down again.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view showing the engagement relationship between the valve seat and the large and small valve covers;

FIG. 3 is a schematic view of the operation of the valve body when the valve body is conducted;

FIG. 4 is a schematic view of the operating principle of the valve body when closed;

fig. 5 is a structural schematic diagram of a blow-down plug screw at the bottom of the valve body.

The names of the parts in the figure are as follows:

1-valve body 2-big valve flap 3-small valve flap 4-gland nut 5-valve stem 6-gasket 7-nut 8-stud 9-packing pad 10-packing 11-support 12-bevel gear case 13-bolt 14-nut 15-packing gland 16-packing pressure sleeve 17-valve cap 18-nut 19-stud 20-pin 21-check valve flap 22-rocker arm 23-nut 24-blowdown screw plug 25-auxiliary seal surface 26-main seal 27-check seal surface 28-sealing gasket 29-bevel gear hand wheel A-valve seat B-overflowing hole B C-overflowing hole C.

Detailed Description

The invention is further described and embodiments of the invention are given below with reference to the accompanying drawings. The core originality of the large-drift-diameter swing type waterproof hammer stop valve lies in the following two points:

one is that a combined valve clack is designed, and the opening and closing performance of the valve clack is further improved by the combined valve clack consisting of a large valve clack and a small valve clack;

secondly, a check valve clack mechanism is additionally arranged at a fluid outlet of an inner cavity of the valve body, so that a flow channel of the valve body is actively closed after the conveying fluid is cut off, and reverse impact flow formed by the return fluid is prevented; thereby preventing the formation of a water hammer phenomenon.

The invention is further described below and embodiments of the invention are given in conjunction with the drawings of the specification.

A large-bore swing type waterproof hammer stop valve as shown in fig. 1 to 5, comprising: valve body 1, valve rod 5, valve gap 11 and valve clack subassembly, valve rod 5 cluster put in the central channel of valve gap 11, its upper end is connected with bevel gear case 12 that is controlled by the hand wheel, its lower extreme constitutes the main structure of damming of valve body runner, its characterized in that through the valve gap of locating the tip with the disk seat A of locating 1 inner chamber of valve body: the valve clack assembly consists of a large valve clack 2 and a small valve clack 3 sleeved in the large valve clack 2, the small valve clack 3 is directly and fixedly connected with the lower end part of the valve rod into a whole, and an intercepted auxiliary sealing surface 25 is formed on the contact surface of the small valve clack 3 and the large valve clack 2; the end part of the big valve clack 2 is provided with a gland nut 4, the small valve clack 3 can synchronously move in the inner cavity of the big valve clack formed by the big valve clack 2 and the gland nut 4 along with the lifting movement of the valve rod 5, and forms an intercepting main sealing surface 26 in a valve body flow passage together with the valve seat A; and meanwhile, a cantilever type check valve clack mechanism is additionally arranged in the inner cavity of the valve body 1 at the output end of the inner cavity of the valve body 1, and a check sealing surface 27 for preventing backflow liquid from forming water hammer impact in the valve body is formed by the cantilever type check valve clack mechanism.

Big valve clack 2 be the U type, be equipped with the discharge orifice B that the slant set up around its peripherad lamella body, and the bottom of big valve clack 2 is equipped with the discharge orifice C that link up mutually with the lower part of valve body 1 through-flow channel.

The cantilever type check valve clack mechanism consists of a check valve clack 21 and a rocker arm 22, the upper end of the rocker arm 22 is in cantilever type connection with the inner cavity of the valve body through a hinge mechanism, and the check valve 21 is fixedly connected with the rocker arm 22 into a whole through a nut 23.

The bottom of the valve body 1 is provided with a pollution discharge plug screw 24.

Fig. 1 shows a schematic view of the present invention in its original state at rest;

fig. 3 is a schematic diagram showing a state when the stop valve of the large-diameter swing type waterproof hammer is opened.

When the valve is opened:

the driving valve rod 5 is lifted upwards along with the rotation of the bevel gear hand wheel 29 for controlling the bevel gear box 12, the small valve clack 3 drives the large valve clack 2 to rise synchronously along with the rising of the valve rod 5, so that the large valve clack 2 is separated from a main sealing surface formed by the valve seat A, a large amount of fluid medium in an upstream pipeline enters the valve cavity, and the check valve clack 21 arranged at the outlet end of an inner cavity of the valve body 1 is pushed by the thrust of the flowing medium, so that the valve is in a fully opened state.

When the valve is closed (see attached figures 4 and 5):

when the valve is closed, the bevel gear hand wheel 29 is rotated clockwise, the big valve clack 2 is gradually moved downwards to the valve seat A of the main sealing surface along with the descending of the valve rod 5, and the flowing medium is basically cut off at the moment; the check valve clack 21 arranged in a cantilever shape is gradually closed, and simultaneously, the small valve clack 3 continuously moves downwards until the small valve clack is contacted with and pressed by the large valve clack 2. After a period of time (the time is designed according to the pipeline behind the valve), the medium in the pipeline is easy to generate a water hammer formed by backflow and impacts on the check valve clack 21, so that the whole flow channel is closed; because the check valve clack 21 is not the main sealing surface, the sealing of the valve can be ensured, and the damage of the water hammer phenomenon to the main sealing surface and the valve rod can be prevented.

The valve cavity needs to be cleaned after a period of use (see fig. 5), in order to remove deposits generated in the valve cavity, which would otherwise reduce the flow capacity of the valve. When in maintenance, the pressure in the pipeline is removed, the blowdown screw plug 24 is unscrewed, the sealing gasket is taken down, the deposit is discharged, the sealing gasket and the blowdown screw plug are cleaned, and the valve is screwed down again, so that the valve can be continuously and normally used.

The above is only an example of the present invention given by the applicant according to the technical solution, and any person skilled in the same industry who makes the improvement without creativity with reference to the basic solution should be regarded as belonging to the protection scope of the present invention.

Claims

1. The utility model provides a waterproof hammer stop valve of big latus rectum swing, includes: valve body (1), valve rod (5), valve gap (17) and valve clack subassembly, valve rod (5) cluster put in the center channel of valve gap (17), its upper end is connected with bevel gear case (12) that are controlled by the hand wheel, its lower extreme passes the valve gap and constitutes the main structure of damming of valve body runner with disk seat (A) of locating valve body (1) inner chamber, its characterized in that: the valve clack assembly consists of a large valve clack (2) and a small valve clack (3) sleeved in the large valve clack (2), the small valve clack (3) is directly and fixedly connected with the lower end part of the valve rod into a whole, and an intercepted auxiliary sealing surface (25) is formed on the contact surface of the small valve clack (3) and the large valve clack (2); the end part of the big valve clack (2) is provided with a gland nut (4), the small valve clack (3) can synchronously move in the inner cavity of the big valve clack formed by the big valve clack (2) and the gland nut (4) along with the lifting motion of the valve rod (5), and forms an intercepting main sealing surface (26) in a valve body flow passage together with the valve seat A; and meanwhile, a cantilever type check valve clack mechanism is additionally arranged in the inner cavity of the valve body (1) at the output end of the inner cavity of the valve body (1), and a check sealing surface (27) for preventing backflow liquid from forming water hammer impact in the valve body is formed by the cantilever type check valve clack mechanism.

2. The large-drift-diameter swing type waterproof hammer stop valve as claimed in claim 1, wherein: big valve clack (2) be the U type, be equipped with the discharge orifice B that crosses that the slant set up around its perivalvular body, and the bottom of big valve clack (2) is equipped with and overflows discharge orifice C that the passageway link up mutually with valve body (1) lower part.

3. The large-drift-diameter swing type waterproof hammer stop valve as claimed in claim 1, wherein: the cantilever type check valve clack mechanism consists of a check valve clack (21) and a rocker arm (22), wherein the upper end of the rocker arm (22) is in cantilever type connection with the inner cavity of the valve body through a hinge mechanism, and the check valve clack (21) is fixedly connected with the rocker arm (22) into a whole through a nut (23).

4. The large-drift-diameter swing type waterproof hammer stop valve as claimed in claim 1, wherein: the bottom of the valve body (1) is provided with a pollution discharge plug screw (24).