CN111895173B

CN111895173B - Gate valve

Info

Publication number: CN111895173B
Application number: CN202010783172.6A
Authority: CN
Inventors: 武芳; 李辉; 洪德朋
Original assignee: TEJI VALVE GROUP CO Ltd
Current assignee: TEJI VALVE GROUP Co.,Ltd.
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-10-19
Anticipated expiration: 2040-08-06
Also published as: CN111895173A

Abstract

The invention relates to a gate valve, comprising: a valve body having an inlet flow passage and an outlet flow passage; the gate plate is arranged in the valve body in a sliding mode and can block the inlet flow channel and the outlet flow channel; with flashboard upper end swivelling joint's valve rod, and with valve body threaded connection, through rotatory the valve rod can drive the flashboard removes along vertical direction, thereby control the break-make of gate valve, the balanced valve barrel of fixedly connected with on the valve rod, through making the effort of medium effect on balanced valve barrel, flashboard be in balanced state, make the medium under the high pressure can not produce great resistance to opening and close of flashboard, therefore the flashboard is opened and is closed more easily.

Description

Gate valve

Technical Field

The invention relates to the technical field of pipeline valves, in particular to a gate valve.

Background

The gate valve is the most important valve at present, and is widely used for the circulation and the stopping of media such as liquid, gas, dust and the like. Generally, the gate valve includes the valve body, and the valve body lower part has import and export, and the left end of import and the right-hand member of export all have sealed face, and the movive seal complex is equipped with the valve plate that can reciprocate and can not rotate between two sealed faces. Meanwhile, the upper part of the valve plate is connected with a valve rod, and the upper part of the valve rod is connected with a handle through a screw nut mechanism. After the handle rotates, the valve rod is driven to move up and down through the screw rod nut mechanism, then the valve plate moves up and down to seal or open the two sealing surfaces, and finally the inlet and the outlet are communicated or cut off. The valve rod of the gate valve in the prior art only receives upward acting force of a medium in the pipeline, when the pressure in the pipeline is higher, the pressure in the pipeline acts on the valve rod to generate upward very large acting force on the valve rod, so that a valve plate needs large operating force when being closed, and the valve plate is difficult to close.

Disclosure of Invention

Therefore, it is necessary to provide a gate valve that can easily close and open the gate plate, and reduce the operation difficulty, in view of the above problems.

The invention discloses a gate valve, comprising: a valve body having an inlet flow passage and an outlet flow passage; the gate plate is arranged in the valve body in a sliding mode and can block the inlet flow channel and the outlet flow channel; a valve rod rotatably connected with the upper end of the gate plate and in threaded connection with the valve body, the gate plate can be driven to move in the vertical direction by rotating the valve rod so as to control the on-off of the gate valve, a balance valve sleeve is fixedly connected to the valve rod and comprises a shaft sleeve part positioned at the upper part and a limiting part positioned at the lower part, the diameter of the limiting part is larger than that of the shaft sleeve part, a first containing cavity is formed between the upper end of the shaft sleeve part and the valve body, a second containing cavity is formed between the upper end of the limiting part and the valve body, a third containing cavity is formed between the lower end of the limiting part and the valve body, a first channel for communicating the first containing cavity with atmosphere, a second channel for communicating the second containing cavity with an inlet flow passage, a third channel for communicating the third containing cavity with atmosphere and a third containing cavity are formed on the valve body, and a fourth containing cavity and a fifth containing cavity are further formed on the valve body, the gate plate can be accommodated in the fourth cavity, so that the inlet runner is communicated with the outlet runner, the gate plate can extend into the fifth cavity to block the inlet runner from the outlet runner, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline communicated with the first pipeline, the second pipeline and the third pipeline are arranged on the gate plate, when the gate plate falls down to block the inlet runner from the outlet runner, the first pipeline is communicated with the fourth cavity, the second pipeline is communicated with the inlet runner, and the third pipeline and the fourth pipeline are communicated with the fifth cavity.

In one embodiment, the medium in the valve body acts on the gate plate, the valve rod and the balance valve sleeve, when the gate plate is closed, the medium acts on the gate plate upwards by F1, acts on the gate plate downwards by F2, acts on the balance valve sleeve downwards by F3, and F1 is F2+ F3.

In one embodiment, when the gate is closed, the medium enters the fourth cavity through the first pipeline, so that a downward force F2 is exerted on the gate by acting on the top of the gate, and enters the fifth cavity through the third pipeline, so that a downward force F1 is exerted on the bottom of the gate by acting on the gate, the difference between the upward acting area and the downward acting area of the medium on the gate is S1, the medium enters the second cavity through the second channel and acts on the upper end of the limiting part, the acting area is S2, and S2 is S1, so that F3 is F1-F2.

In one embodiment, a connecting block is arranged on the valve rod, a connecting groove is arranged on the balance valve sleeve, and the connecting block is clamped into the connecting groove, so that the valve rod is fixedly connected with the balance valve sleeve.

In one embodiment, the valve body includes a body, a cover, and a connecting body, the connecting body is disposed on the upper portion of the body, the cover is covered on the upper portion of the connecting body, the first cavity is located in the cover, the second cavity and the third cavity are located in the connecting body, the fourth cavity and the fifth cavity are located in the body, and the second channel passes through the body and the connecting body and is communicated with the second cavity.

In one embodiment, the top of the valve stem is provided with a handle.

The invention has the advantages that: the valve rod is fixedly provided with the balance valve sleeve, acting force acting on the balance valve sleeve and the flashboard through the medium is in a balance state, the medium under high pressure cannot generate resistance on opening and closing of the flashboard, therefore, the flashboard is opened and closed more laborsavingly, and convenience in operation of the gate valve is improved.

Drawings

Fig. 1 is a sectional view of a gate valve according to the present invention in an opened state;

fig. 2 is a sectional view of a gate valve according to the present invention in a closed state.

In the figure, the valve body 1, the cover 11, the first cavity 111, the second cavity 112, the third cavity 113, the first channel 114, the second channel 115, the third channel 116, the body 12, the fourth cavity 121, the fifth cavity 122, the inlet channel 123, the outlet channel 124, the connecting body 13, the shutter 2, the first pipeline 21, the second pipeline 22, the third pipeline 23, the fourth pipeline 24, the valve rod 3, the connecting block 31, the balance valve sleeve 4, the shaft sleeve portion 41, the limiting portion 42, the connecting groove 43, and the handle 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, the present invention discloses a gate valve, including: valve body 1, the slip that has inlet flow channel 123 and outlet flow channel 124 set up in flashboard 2 in the valve body 1, with flashboard 2 upper end swivelling joint's valve rod 3, flashboard 2 can the separation inlet flow channel 123 and outlet flow channel 124, valve rod 3 swivelling joint in the upper end of flashboard 2, and with 1 threaded connection of valve body, through the rotation valve rod 3 can drive flashboard 2 removes along vertical direction, thereby control the break-make of gate valve. The valve body 1 comprises a body 12, a cover body 11 and a connecting body 13, wherein the connecting body 13 is arranged on the upper portion of the body 12, the cover body 11 is arranged on the upper portion of the connecting body 13 in a covering mode, and a handle 5 is arranged at the top of the valve rod 3.

The valve rod 3 is fixedly connected with a balance valve sleeve 4, the balance valve sleeve 4 comprises a shaft sleeve part 41 positioned at the upper part and a limit part 42 positioned at the lower part, the diameter of the limit part 42 is larger than that of the shaft sleeve part 41, a first cavity 111 is formed between the upper end of the shaft sleeve part 41 and the valve body 1, a second cavity 112 is formed between the upper end of the limit part 42 and the valve body 1, a third cavity 113 is formed between the lower end of the limit part 42 and the valve body 1, the valve body 1 is provided with a first channel 114 for communicating the first cavity 111 with the atmosphere, a second channel 115 for communicating the second cavity 112 with the inlet flow channel 123, and a third channel 116 for communicating the third cavity 113 with the atmosphere, the valve body 1 is further provided with a fourth cavity 121 and a fifth cavity 122, and the gate plate 2 can be accommodated in the fourth cavity 121 so as to communicate the inlet flow channel 123 with the outlet flow channel 124, the shutter 2 can extend into the fifth cavity 122 to block the inlet flow passage 123 and the outlet flow passage 124, the first cavity 111 is located in the cover 11, the second cavity 112 and the third cavity 113 are located in the connecting body 13 and are blocked by the limiting portion 42, along with the up-and-down movement of the limiting portion 42, the volumes of the second cavity 112 and the third cavity 113 change relatively, the fourth cavity 121 and the fifth cavity 122 are located in the body 12, and the second passage 115 passes through the body 12 and the connecting body 13 and is communicated with the second cavity 112.

It should be mentioned that the first cavity 111 is disposed in the cover 11, the third cavity 113 is disposed in the connecting body 13, the first channel 114 is disposed to communicate the first cavity 111 with the atmosphere, and the third channel 116 is disposed to communicate the third cavity 113 with the atmosphere, so that the balance valve sleeve 4 can freely move up and down.

The gate plate 2 is provided with a first pipeline 21, a second pipeline 22, a third pipeline 23 and a fourth pipeline 24 communicating with the first pipeline 21, the second pipeline 22 and the third pipeline 23, when the gate plate 2 falls down and blocks the inlet flow passage 123 and the outlet flow passage 124, the first pipeline 21 is communicated with the fourth accommodating cavity 121, the second pipeline 22 is communicated with the inlet flow passage 123, and the third pipeline 23 and the fourth pipeline 24 are communicated with the fifth accommodating cavity 122.

It will be appreciated that the seal is arranged to act as a seal to close off the chambers, in a conventional manner and is not deployed.

Preferably, the medium in the valve body 1 exerts a force on the shutter plate 2, the valve rod 3, and the balance valve sleeve 4, and when the shutter plate 2 is closed, the medium exerts an upward force F1 on the shutter plate 2, a downward force F2 on the shutter plate 2, and a downward force F3 on the balance valve sleeve 4, where F1 is F2+ F3.

It should be noted that when the shutter 2 is closed, the medium enters the fourth cavity 121 through the first pipeline 21, so as to act on the top of the shutter 2, and generate a downward force F2 on the shutter 2, enters the fifth cavity 122 through the third pipeline 23 and the fourth pipeline 24, so as to act on the bottom of the shutter 2, and generate an upward force F1 on the shutter 2, and the difference between the upward acting area and the downward acting area of the medium on the shutter 2 is S1, the medium enters the second cavity 112 through the second channel 115, and acts on the upper end of the limiting portion 42, and the acting area is S2, and S2 is S1, so that F3 is F1-F2.

Preferably, a connecting block 31 is arranged on the valve rod 3, a connecting groove 43 is arranged on the balance valve sleeve 4, and the connecting block 31 is clamped in the connecting groove 43, so that the valve rod 3 is fixedly connected with the balance valve sleeve 4.

The working mode of the invention is as follows: when the gate plate 2 is in an open state, a medium enters the inlet flow passage 123 and the outlet flow passage 124, the fourth pipeline 24 is communicated with the inlet flow passage 123, the medium enters the fourth cavity 121 through the fourth pipeline 24, the first pipeline 21 and the second pipeline 22 and acts on the top of the gate plate 2, meanwhile, the medium enters the second cavity 112 through the second channel 115 and acts on the top of the limiting part 42, so that the valve rod 3, the balance valve sleeve 4 and the gate plate 2 are in a state of stress balance, and it is labor-saving to rotate the valve rod 3 to move the gate plate 2 downwards.

When the gate plate 2 is in a closed state, the lower end of the gate plate 2 extends into the fifth cavity 122, at this time, the liquid in the inlet flow channel 123 enters the fourth pipeline 24 through the second pipeline 22, enters the fourth cavity 121 through the first pipeline 21, acts on the upper end of the gate plate 2, enters the fifth cavity 122 through the third pipeline 23 and the fourth pipeline 24, acts on the lower end of the gate plate 2, and simultaneously, the medium enters the second cavity 112 through the second channel 115 and acts on the top of the limiting part 42, so that the valve rod 3, the balance valve sleeve 4 and the gate plate 2 are in a state of stress balance, and the gate plate 2 is opened in a labor-saving manner.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A gate valve, comprising: a valve body having an inlet flow passage and an outlet flow passage; the gate plate is arranged in the valve body in a sliding mode and can block the inlet flow channel and the outlet flow channel; a valve rod rotatably connected with the upper end of the gate plate and in threaded connection with the valve body, the gate plate can be driven to move in the vertical direction by rotating the valve rod so as to control the on-off of the gate valve, the gate valve is characterized in that a balance valve sleeve is fixedly connected to the valve rod, the balance valve sleeve comprises a shaft sleeve part positioned at the upper part and a limiting part positioned at the lower part, the diameter of the limiting part is larger than that of the shaft sleeve part, a first containing cavity is formed between the upper end of the shaft sleeve part and the valve body, a second containing cavity is formed between the upper end of the limiting part and the valve body, a third containing cavity is formed between the lower end of the limiting part and the valve body, a first channel for communicating the first containing cavity with the atmosphere, a second channel for communicating the second containing cavity with an inlet flow passage, and a third channel for communicating the third containing cavity with the atmosphere are formed on the valve body, and a fourth containing cavity and a fifth containing cavity are further formed on the valve body, the gate plate can be accommodated in the fourth cavity, so that the inlet runner is communicated with the outlet runner, the gate plate can extend into the fifth cavity to block the inlet runner from the outlet runner, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline communicated with the first pipeline, the second pipeline and the third pipeline are arranged on the gate plate, when the gate plate falls down to block the inlet runner from the outlet runner, the first pipeline is communicated with the fourth cavity, the second pipeline is communicated with the inlet runner, and the third pipeline and the fourth pipeline are communicated with the fifth cavity.

2. The gate valve of claim 1, wherein the medium in the valve body exerts a force on the gate plate, the valve stem, and the equalizer sleeve, and when the gate plate is closed, the medium exerts an upward force F1 on the gate plate, a downward force F2 on the gate plate, and a downward force F3 on the equalizer sleeve, and F1 is F2+ F3.

3. The gate valve of claim 2 wherein when said gate is closed said media is supplied through said first conduit into said fourth chamber to act on the top of said gate to produce a downward force F2 on said gate and through said third conduit into said fifth chamber to act on the bottom of said gate to produce an upward force F1 on said gate with the difference between the area of upward and downward action of said media on said gate being S1, said media is supplied through said second conduit into said second chamber to act on the upper end of said retainer portion with an action area of S2 and S2 being S1 to provide F3 being F1-F2.

4. The gate valve of claim 1, wherein the valve stem is provided with a connecting block, the balance valve sleeve is provided with a connecting groove, and the connecting block is clamped into the connecting groove, so that the valve stem is fixedly connected with the balance valve sleeve.

5. The gate valve of claim 1, wherein the valve body comprises a body, a cover and a connector, the connector is disposed on the upper portion of the body, the cover is disposed on the upper portion of the connector, the first cavity is disposed in the cover, the second and third cavities are disposed in the connector, the fourth and fifth cavities are disposed in the body, and the second channel passes through the body and the connector and is communicated with the second cavity.

6. The gate valve of claim 1, wherein the stem top is provided with a handle.