CN111878598A

CN111878598A - Plug valve

Info

Publication number: CN111878598A
Application number: CN202010644858.7A
Authority: CN
Inventors: 张柏; 尹肖飞; 其他发明人请求不公开姓名
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-11-03

Abstract

The present invention provides a plug valve comprising: a valve body; a valve cover; a valve plug body; a first handle; a control lever; a second handle; a slider; a first plug lobe and a second plug lobe; a first link and a second link. According to the plug valve provided by the embodiment of the invention, the friction force is low in the opening and closing process.

Description

Plug valve

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a plug valve.

Background

Plug valves are widely used in oil field exploitation, transportation and refining equipment, and widely used in petrochemical industry, chemical industry, coal gas, natural gas, liquefied petroleum gas, heating and ventilation industry, ships and general industry; the main functions are to switch off, switch on and shunt the medium. The existing plug valve comprises a valve body, a valve core, a valve seat and a valve rod, wherein the valve rod is connected with the valve core, the valve seat is positioned in a channel in the valve body, and the valve core and the valve seat of the plug valve are matched to form a sealing pair. The valve rod is rotated to drive the valve core to rotate together, so that the channel port on the valve core is communicated with or separated from the channel port on the valve body, and the opening or closing action is realized. The plug valve is sealed by means of the direct contact between the metal valve core and the valve seat, so that the plug valve has great opening and closing force and is easy to wear. Therefore, there is a need for a low friction plug valve.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

To this end, it is an object of the present invention to provide a low friction plug valve.

A plug valve according to an embodiment of the present invention includes:

the valve body is provided with an inlet and an outlet which are symmetrical left and right and a communication cavity for communicating the inlet and the outlet;

the valve cover is arranged on the valve body and is provided with a through hole right above the communicating cavity;

the plug body comprises a main body part which is matched in the communicating cavity and a connecting rod which upwards passes through the through hole and extends out of the valve cover, and a first flow passage and a second flow passage which are intersected are formed on the main body part;

the first handle is connected with the upper end of the connecting rod;

the lower end of the control rod sequentially penetrates through the connecting rod and the main body part downwards and is rotatably connected with the valve body, the upper end of the control rod extends out of the upper end face of the connecting rod upwards, and a bulge is arranged on the peripheral wall of the control rod in the main body part;

the second handle is connected with the upper end of the control rod;

the sliding block is sleeved on the control rod in the main body part in a vertically movable mode, and a spiral groove matched with the bulge is formed in the sliding block;

the first plug flap and the second plug flap are symmetrically arranged at two ends of one of the first flow passage and the second flow passage in a left-right mode, the bottom of the first plug flap is pivotally connected with the main body part, and the bottom of the second plug flap is pivotally connected with the main body part;

the first connecting rod and the second connecting rod are arranged in bilateral symmetry relative to the sliding block, one end of the first connecting rod is pivotally connected with the sliding block, the other end of the first connecting rod is pivotally connected with the upper portion of the first plug flap, one end of the second connecting rod is pivotally connected with the sliding block, and the other end of the second connecting rod is pivotally connected with the upper portion of the second plug flap.

Advantageously, the communication chamber is in the form of a truncated cone with a large top and a small bottom.

Advantageously, the main body portion is in a circular truncated cone shape matched with the communication cavity.

Advantageously, the outer peripheral wall of the first plug flap and the outer peripheral wall of the second plug flap are each configured as a curved surface that fits the outer peripheral wall of the frustoconical main body portion.

Advantageously, the first flow channel and the second flow channel are orthogonal.

Advantageously, the first plug flap and the second plug flap are arranged bilaterally symmetrically at both ends of the second flow passage.

Advantageously, the bottom wall of the second flow channel is lower than the bottom wall of the first flow channel.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic view of a plug valve according to one embodiment of the present invention, shown in a closed position;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a plug valve according to another embodiment of the present invention with the first and second plug lobes in a disengaged condition from the sealing surface of the valve body;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a schematic view of a plug valve according to yet another embodiment of the present invention, shown in an open position;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5;

FIG. 7 is a schematic view of a slider block of a plug valve according to one embodiment of the present invention;

FIG. 8 is a schematic view of a plug body of a plug valve according to one embodiment of the present invention;

FIG. 9 is a schematic view of a first plug lobe or a second plug lobe of a plug valve according to an embodiment of the present invention;

FIG. 10 is another schematic view of the first plug lobe or the second plug lobe of a plug valve according to one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A plug valve according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 10, a plug valve according to an embodiment of the present invention includes: the valve comprises a valve body 1, a valve cover 2, a valve plug body 4, a first handle 7, a control rod 5, a second handle 8, a sliding block 6, a first plug valve 3a, a second plug valve 3b, a first connecting rod 91 and a second connecting rod 92.

Specifically, the valve body 1 has an inlet and an outlet which are bilaterally symmetrical, and a communication chamber which communicates the inlet and the outlet.

The valve cover 2 is arranged on the valve body 1, and the valve cover 2 is provided with a through hole right above the communicating cavity.

The cock body 4 comprises a main body part 4a which is fitted in the communication cavity and a connecting rod 4b which passes through the through hole upwards and extends out of the valve cover 2, and the main body part 4 is formed with a first flow passage 41 and a second flow passage 42 which are intersected. Advantageously, the first flow channel 41 and the second flow channel 42 are orthogonal.

The first handle 7 is connected to the upper end of the connecting rod 4 b.

The lower end of the control rod 5 penetrates the connecting rod 4b and the main body part 4a downwards in sequence and is rotatably connected with the valve body 1, the upper end of the control rod 5 extends upwards out of the upper end face of the connecting rod 4b, and the control rod 5 is provided with a protrusion 51 on the peripheral wall positioned in the main body part 4 a.

A second handle 8 is connected to the upper end of the control rod 5.

The slider 6 is sleeved on the control rod 5 in the main body part 4a in a manner of moving up and down, and the slider 6 is provided with a spiral groove 61 matched with the bulge 51.

The first plug flap 3a and the second plug flap 3b are provided at both ends of one of the first flow passage 41 and the second flow passage 42 in bilateral symmetry, the bottom of the first plug flap 3a is pivotably connected to the body portion 4a and the bottom of the second plug flap 3b is pivotably connected to the body portion 4 a.

The first link 91 and the second link 92 are arranged bilaterally symmetrically with respect to the slider 6, one end of the first link 91 is pivotably connected to the slider 6 and the other end of the first link 91 is pivotably connected to the upper portion of the first plug flap 3a, one end of the second link 92 is pivotably connected to the slider 6 and the other end of the second link 92 is pivotably connected to the upper portion of the second plug flap 3 b.

According to an example of the present invention, the communication chamber is configured in a circular truncated cone shape having a large top and a small bottom. Advantageously, the main body portion 4a is frustoconical in shape adapted to said communication chamber. Further, the outer peripheral wall of the first plug flap 3a (i.e., the one surface facing the inner wall of the communication chamber) and the outer peripheral wall of the second plug flap 3b (i.e., the one surface facing the inner wall of the communication chamber) are each configured into a curved surface that fits the outer peripheral wall of the circular truncated cone-shaped main body portion 4 a.

According to a specific example of the present invention, the first plug lobes 3a and the second plug lobes 3b are provided at both ends of the second flow passage 42 in left-right symmetry. Advantageously, the bottom wall of the second flow channel 42 is lower than the bottom wall of the first flow channel 41.

The operation of a plug valve according to an embodiment of the present invention will now be briefly described.

As shown in fig. 1 and 2, the plug valve according to the embodiment of the present invention is in the closed state, in which the slide block 6 is in the low position, and the included angle between the first link 92 and the second link 91 is large, so that the first plug flap 3a and the second plug flap 3b are respectively attached to the sealing surface of the valve body 1, and the second passage 42 is blocked, so that the inlet and the outlet are disconnected.

When the plug valve needs to be opened, as shown in fig. 3 and 4, the second handle 8 is firstly rotated to drive the control rod 5 to rotate, and then the slider 6 is moved upwards through the matching of the protrusion 51 and the spiral groove 61, and then the top of the first plug flap 3a and the top of the second plug flap 3b are driven to be close to each other through the first connecting rod 91 and the second connecting rod 92, so that the first plug flap 3a is separated from the sealing surface of the valve body 1, and the second plug flap 3b is separated from the sealing surface of the valve body 1. As shown in fig. 5 and 6, the first handle 7 is then rotated by a predetermined angle (which is equal to the angle between the first flow path 41 and the second flow path 42, and is 90 ° when the first flow path 41 is orthogonal to the second flow path 42) so that the first flow path 41 communicates with the inlet and the outlet, respectively, and the cock valve is opened.

It will be appreciated that closing a plug valve according to an embodiment of the present invention is the reverse of the opening process described above, as will be appreciated by those skilled in the art.

According to the plug valve provided by the embodiment of the invention, the plug valve body is provided with the first plug flap and the second plug flap which are movably connected in the plug valve body, when the plug valve is opened, the second handle is firstly rotated to drive the first plug flap and the second plug flap to rotate, so that the first plug flap and the second plug flap are separated from the sealing surface of the valve body, and then the first handle is rotated by a preset angle, so that the plug valve can be opened. The invention has small friction and long service life.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A plug valve, comprising:

the first handle is connected with the upper end of the connecting rod;

the second handle is connected with the upper end of the control rod;

2. The plug valve of claim 1, wherein said communication chamber is configured in the shape of a truncated cone having a large top and a small bottom.

3. The plug valve of claim 2, wherein said body portion is frustoconical in shape adapted to said communication cavity.

4. The plug valve of claim 3, wherein the outer peripheral wall of the first plug lobe and the outer peripheral wall of the second plug lobe are each configured as a curved surface that conforms to the outer peripheral wall of the frustoconical body portion.

5. The plug valve of claim 1, wherein said first flow passage and said second flow passage are orthogonal.

6. The plug valve of claim 5, wherein said first and second plug lobes are disposed bilaterally symmetrically at opposite ends of said second flow passage.

7. The plug valve of claim 6, wherein the bottom wall of the second flow passage is lower than the bottom wall of the first flow passage.