Sleeve type high-pressure-difference serial sealing stop valve

Abstract

The invention relates to the related technical field of fluid control, in particular to a sleeve type high-pressure-difference serial sealing stop valve which comprises a valve body, a valve core, a valve core, a valve rod and a valve rod. The valve seat is mounted in the vertical channel, and an annular boss is formed on the valve seat; the valve element is connected with a valve rod, a valve sleeve is arranged on the outer side of the valve element, and the valve element and the valve sleeve move synchronously and make contact with the outer side and the inner side of the annular boss in sequence. The valve rod drives the valve sleeve and the valve element to synchronously move downwards, the valve sleeve firstly moves to the outer side of the annular boss to achieve closing of the valve body, then the valve sleeve continues to be inserted into the inserting gap, the valve element moves along with the valve sleeve and is inserted into the annular boss, secondary sealing is achieved, and meanwhile when the valve body is opened, the valve element is opened firstly, and then the valve sleeve is separated from the annular boss. The valve sleeve is firstly closed or then opened to bear most high pressure difference, the valve sleeve plays a role in preferentially blocking liquid flowing through the valve body, and the problem that the valve element is washed and damaged by the liquid is solved.

Description

Technical Field

[0001] The invention relates to the technical field related to fluid control, in particular to a sleeve-type high-pressure differential chain sealing stop valve. Background Art

[0002] The opening and closing parts of the stop valve are plug-shaped discs, with a flat or sea cone surface on the sealing surface, and the disc moves linearly along the center line of the valve seat. The movement form of the valve stem (general name: dark stem) is also available in the lifting and rotating stem type, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this type of shut-off stop valve is very suitable for cutting off or regulating and throttling. Since the valve stem opening or closing stroke of this type of valve is relatively short and has a very reliable cutting function, and since the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating the flow.

[0003] At present, conventional stop valves include a valve body, a valve seat and a valve core, etc. The sealing surfaces of the valve seat and the valve core are generally a single sealing form. When the stop valve performs a closing action from an open state, the valve core moves toward the valve seat under the action of the valve stem to achieve sealing. However, during the movement of the valve core, the flow area of ​​the valve body gradually decreases, resulting in a large pressure difference in the valve body, which causes the medium to scour the valve core, making the valve core easily damaged, resulting in a poor overall cutoff effect of the stop valve. Summary of the invention

[0004] The object of the present invention is to provide a sleeve-type high-pressure differential chain-sealed stop valve to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A sleeve-type high-pressure differential serial sealing stop valve, comprising:

[0007] The valve body is formed with a vertical channel communicating with the flow channels on both sides;

[0008] A valve seat is installed in the vertical channel, an annular boss is formed on the valve seat, and an insertion gap is formed between the outer side of the annular boss and the inner wall of the vertical channel;

[0009] The valve core is connected with a valve stem, and a valve sleeve is arranged on the outer side of the valve core. The valve core and the valve sleeve move synchronously and contact the outer side and the inner side of the annular boss successively.

[0010] As described above, the sleeve-type high-pressure differential chain sealing stop valve: the valve sleeve wraps the valve core inside, the end of the valve core facing the valve seat is in a truncated cone shape, and a slot for the annular boss to be inserted is formed between the valve core and the valve sleeve.

[0011] The sleeve-type high-pressure differential serial sealing stop valve as described above: the valve sleeve is arranged in a circular or polygonal shape.

[0012] The sleeve-type high-pressure differential serial sealing stop valve as described above: the valve sleeve and the valve core are integrally formed.

[0013] The sleeve-type high-pressure differential serial sealing stop valve as described above: the valve sleeve and the valve core are separately arranged and assembled into one body.

[0014] As described above, the sleeve-type high-pressure differential chain sealing stop valve: at least one first fixing hole is formed on the side end of the valve sleeve, and a second fixing hole corresponding to the first fixing hole is formed on the valve core. The valve sleeve is sleeved on the outside of the valve core, and a pin is inserted into the first fixing hole and the second fixing hole to fix the valve sleeve to the valve core.

[0015] As described above, the sleeve-type high-pressure differential chain sealing stop valve: a first positioning groove is formed on the inner wall of the valve sleeve, and a second positioning groove is formed on the outer wall of the valve core. After the valve sleeve is sleeved on the valve core, the positioning piece is inserted into the first positioning groove and the second positioning groove.

[0016] The sleeve-type high-pressure differential serial sealing stop valve as described above: a sealing gasket is arranged between the valve seat and the inner bottom of the vertical channel.

[0017] Compared with the prior art, the present invention has the following beneficial effects: when the valve body is closed, the valve stem drives the valve sleeve and the valve core to move downward synchronously, the valve sleeve first moves to the outside of the annular boss to close the valve body, and then the valve sleeve continues to be inserted into the insertion gap, the valve core follows the movement and is inserted into the annular boss to achieve secondary sealing, and at the same time, when the valve body is opened, the valve core opens first and then the valve sleeve separates from the annular boss. By setting the valve sleeve to close first or open later to bear most of the high pressure difference, the valve sleeve plays a role of preferentially blocking the liquid flowing through the valve body, so that the pressure difference applied to the valve core is smaller, thereby effectively reducing the problem of the valve core being damaged by liquid erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a sleeve-type high-pressure differential chain seal stop valve.

[0019] Figure 2 It is a schematic diagram of the separation state of the valve seat, valve core and valve seat in the sleeve-type high-pressure differential serial seal stop valve.

[0020] Figure 3 It is a schematic diagram of the connection status of the valve seat, valve core and valve seat in the sleeve-type high-pressure differential serial sealing stop valve.

[0021] Figure 4 It is an exploded diagram of the structure of the valve seat, valve core and valve seat in the sleeve-type high-pressure differential serial seal stop valve.

[0022] In the figure: 1-valve body, 2-valve seat, 201-annular boss, 3-sealing gasket, 4-valve stem, 5-valve sleeve, 501-first fixing hole, 502-first positioning groove, 6-valve core, 601-second fixing hole, 602-second positioning groove, 7-pin, 8-positioning piece. DETAILED DESCRIPTION

[0023] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0024] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0025] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0026] See also Figure 1-Figure 4 In an embodiment of the present invention, a sleeve-type high-pressure differential chain sealing stop valve includes a valve body 1, and a vertical channel connected to the flow channels on both sides is formed on the inner side of the valve body 1. The vertical channel is used for the sliding placement of the valve seat 2, the valve stem 4, the valve sleeve 5 and the valve core 6 to achieve the conduction or blocking of the two flow channels, thereby realizing the opening and closing control of the valve body.

[0027] The valve seat 2 is installed in the vertical channel, an annular boss 201 is formed on the valve seat 2, and an insertion gap is formed between the outer side of the annular boss 201 and the inner wall of the vertical channel;

[0028] The valve core 6 is connected to the valve stem 4 , and a valve sleeve 5 is disposed outside the valve core 6 . The valve core 6 and the valve sleeve 5 move synchronously and contact the outer side and the inner side of the annular boss 201 successively.

[0029] When the valve body 1 is closed, the valve stem 4 drives the valve sleeve 5 and the valve core 6 to move downward synchronously. The valve sleeve 5 first moves to the outside of the annular boss 201 to close the valve body 1. Then the valve sleeve 5 continues to be inserted into the insertion gap, and the valve core 6 follows the movement and is inserted into the annular boss 201 to achieve secondary sealing. At the same time, when the valve body 1 is opened, the valve core 6 opens first and then the valve sleeve 5 separates from the annular boss 201. The valve sleeve 5 is set to close first or open later to bear most of the high pressure difference. In other words, the valve sleeve 5 plays a role of preferentially blocking the liquid flowing through the valve body 1, so that the pressure difference on the valve core 6 is smaller, thereby effectively reducing the problem of the valve core 6 being damaged by liquid erosion.

[0030] Please note that Figure 2-Figure 4 The valve sleeve 5 wraps the valve core 6 inside, and the end of the valve core 6 facing the valve seat 2 is truncated cone-shaped. A slot for inserting the annular boss 201 is formed between the valve core 6 and the valve sleeve 5, thereby increasing the relative movement distance between the valve sleeve 5, the valve core 6 and the valve seat 2 to improve the sealing effect. A rubber pad is provided at the truncated cone position of the valve core 6, and a cylindrical cone-shaped through groove is formed on the inner side of the annular boss 201. When the valve core 6 is fitted with the annular boss 201, the sealing effect can be effectively ensured.

[0031] Among them, the valve sleeve 5 is set in a circular or polygonal shape. In this embodiment, the valve sleeve 5 is preferably circular in shape, so as to reduce the opening area of ​​the valve body 1 and optimize the flow channel. It should be noted that the circular or polygonal shape described here is the shape displayed by the valve sleeve 5 from a top view.

[0032] Exemplarily, in one embodiment, the valve sleeve 5 and the valve core 6 are integrally formed, thereby increasing the stability of the connection between the valve sleeve 5 and the valve core 6 and eliminating the problem of elastic loosening in the existing elastic connection, which leads to poor sealing effect or poor barrier effect.

[0033] For another exemplary embodiment, please refer to Figure 2-Figure 4 The valve sleeve 5 and the valve core 6 are separately arranged and assembled into one body. Compared with the valve core 6, the valve sleeve 5 directly contacts the high-pressure difference liquid and is a wearing part. Therefore, the valve sleeve 5 and the valve core 6 are separately arranged to facilitate the replacement of the valve sleeve 5 without replacing the valve core 6, thereby effectively reducing the cost.

[0034] The valve sleeve 5 and valve core 6 described in the two embodiments can be made of alloy material. Of course, in the specific implementation process, the valve sleeve 5 and valve core 6 made of different materials can also be selected according to different fluid media and fluid parameters. This embodiment does not make specific limitations on this.

[0035] In order to realize the installation of the separately arranged valve sleeve 5 and valve core 6, specifically, at least one first fixing hole 501 is formed on the side end of the valve sleeve 5, and a second fixing hole 601 corresponding to the first fixing hole 501 is formed on the valve core 6. The valve sleeve 5 is sleeved on the outside of the valve core 6, and a pin 7 is inserted into the first fixing hole 501 and the second fixing hole 601 to fix the valve sleeve 5 and the valve core 6. A first positioning groove 502 is also formed on the inner wall of the valve sleeve 5, and a second positioning groove 602 is formed on the outer wall of the valve core 6. After the valve sleeve 5 is sleeved on the valve core 6, the positioning piece 8 is inserted into the first positioning groove 502 and the second positioning groove 602.

[0036] During the installation process, the valve sleeve 5 is sleeved on the valve core 6, and then the first fixing hole 501 on the valve sleeve 5 and the second fixing hole 601 on the valve core 6 are placed in a colinear position with the axis through the action of the positioning member 8 in cooperation with the first positioning groove 502 and the second positioning groove 602, and then the pin 7 is inserted to achieve the installation of the valve sleeve 5 and the valve core 6, wherein the pin 7 inserted into the first fixing hole 501 and the second fixing hole 601 is an interference fit relationship, thereby improving the stability of the connection.

[0037] Of course, the above two embodiments of the connection relationship between the valve sleeve 5 and the valve core 6 are just examples. In the specific implementation process, the valve sleeve 5 and the valve core 6 can also be installed and fixed by a threaded connection relationship or a snap-on relationship, which will not be listed one by one in this application.

[0038] Furthermore, a sealing gasket 3 is provided between the valve seat 2 and the inner bottom of the vertical channel, so as to increase the sealing performance of the connection between the valve seat 2 and the valve body 1 .

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sleeve-type high-pressure differential serial sealing stop valve, characterized in that: include: The valve body (1) is formed with a vertical channel communicating with the flow channels on both sides; A valve seat (2) is installed in the vertical channel, an annular boss (201) is formed on the valve seat (2), and an insertion gap is formed between the outer side of the annular boss (201) and the inner wall of the vertical channel; The valve core (6) is connected to the valve stem (4), and a valve sleeve (5) is arranged on the outer side of the valve core (6). The valve core (6) and the valve sleeve (5) move synchronously and contact the outer side and the inner side of the annular boss (201) successively.

2. A sleeve-type high-pressure differential serial sealing stop valve according to claim 1, characterized in that: The valve sleeve (5) wraps the valve core (6) inside, and one end of the valve core (6) facing the valve seat (2) is in the shape of a truncated cone, and a slot for inserting the annular boss (201) is formed between the valve core (6) and the valve sleeve (5).

3. A sleeve-type high-pressure differential serial sealing stop valve according to claim 1 or 2, characterized in that: The valve sleeve (5) is arranged in a circular or polygonal shape.

4. A sleeve-type high-pressure differential serial sealing stop valve according to claim 1, characterized in that: The valve sleeve (5) and the valve core (6) are integrally formed.

5. The sleeve-type high-pressure differential serial sealing stop valve according to claim 1, characterized in that: The valve sleeve (5) and the valve core (6) are arranged separately and assembled into one body.

6. A sleeve-type high-pressure differential serial sealing stop valve according to claim 5, characterized in that: At least one first fixing hole (501) is formed at the side end of the valve sleeve (5), and a second fixing hole (601) corresponding to the first fixing hole (501) is formed on the valve core (6). The valve sleeve (5) is sleeved on the outside of the valve core (6), and a pin (7) is inserted into the first fixing hole (501) and the second fixing hole (601) to fix the valve sleeve (5) and the valve core (6).

7. A sleeve-type high-pressure differential serial sealing stop valve according to claim 6, characterized in that: A first positioning groove (502) is also formed on the inner wall of the valve sleeve (5), and a second positioning groove (602) is formed on the outer wall of the valve core (6). After the valve sleeve (5) is sleeved on the valve core (6), the positioning member (8) is inserted into the first positioning groove (502) and the second positioning groove (602).

8. The sleeve-type high-pressure differential serial sealing stop valve according to claim 1, characterized in that: A sealing gasket (3) is provided between the valve seat (2) and the inner bottom of the vertical channel.

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