A erosion-resistant sealing structure for a regulating valve

Abstract

The present invention discloses an erosion-resistant sealing structure of a regulating valve, characterized in that it comprises a valve body, a valve seat, a valve core, and a sleeve matched with the valve core, wherein a flow channel for medium to pass through is provided in the valve body, wherein the flow channel comprises an inflow section, a buffer section, a valve cavity section, and an outflow section, wherein the cross-sectional area of ​​the buffer section is larger than the cross-sectional areas of the inflow section, the valve cavity section, and the outflow section, wherein a valve seat is provided at the outlet of the valve cavity section, wherein the sleeve is provided in the buffer section, wherein the valve core is provided in the valve cavity section and the sleeve, wherein the bottom end of the valve core is located at the outlet of the valve cavity section, wherein the bottom end of the valve core and the outlet of the valve cavity section are contacted with the valve seat through the bottom end of the valve core to form a sealing surface, wherein an axial protrusion structure is provided at the bottom end of the valve core, wherein the axial protrusion structure protrudes from the bottom end of the valve core and is located in the valve seat and matches the valve seat. The present invention can effectively reduce the direct erosion effect of the medium on the sealing surface of the valve core, protect the integrity of the sealing surface of the valve core, and extend the service life of the valve core.

Description

Technical Field

[0001] The invention relates to an erosion-resistant sealing structure of a regulating valve, belonging to the fields of processing engineering and valves. Background Art

[0002] The existing regulating valve is composed of a valve body 21, a valve seat 22, a valve core 23, a sleeve 24, a valve stem 25, etc. Figure 1 As shown, the valve core 23 acts on the valve seat 22 to seal. Figure 2 and Figure 3 As shown, during the opening and closing process of the valve, the medium flows into the valve cavity through the sleeve 24, and then the medium directly scours the sealing surface of the valve core 23, and then flows out through the valve body flow channel 26. After long-term use, the medium will cause relatively serious erosion and wear on the sealing surfaces of the valve core 23 and the valve seat 22, which is easy to damage the sealing surface of the valve core 23, resulting in a reduction in tightness, making it necessary to repair the sealing surface of the valve core 23 or replace the new valve core 23 frequently, and the service life of the valve core 23 is relatively short. Repairing the sealing surface is a large and important task, which increases the cost of maintenance. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the sealing surface of the valve core of the existing regulating valve sealing structure is easily eroded by the medium.

[0004] In order to solve the above problems, the technical solution of the present invention is to provide an erosion-resistant sealing structure of a regulating valve, which is characterized by: comprising a valve body, a valve seat, a valve core, and a sleeve cooperating with the valve core, wherein the valve body is provided with a flow channel for medium to pass through, and the flow channel comprises an inflow section, a buffer section, a valve cavity section and an outflow section, the cross-sectional area of ​​the buffer section is larger than the cross-sectional areas of the inflow section, the valve cavity section and the outflow section, a valve seat is provided at the outlet of the valve cavity section, the sleeve is provided in the buffer section, the valve core is provided in the valve cavity section and the sleeve, the bottom end of the valve core is located at the outlet of the valve cavity section, the bottom end of the valve core and the outlet of the valve cavity section are in contact with the valve seat through the bottom end of the valve core to form a sealing surface, and the bottom end of the valve core is provided with an axial protrusion structure, the axial protrusion structure protrudes from the bottom end of the valve core and is located in the valve seat and cooperates with the valve seat.

[0005] Preferably, the axial protrusion structure includes a vertical section and an arc section, the vertical section is perpendicular to the bottom end surface of the valve core and connected to the bottom end of the valve core, and the arc section and the vertical section are smoothly transitionally connected and located in the valve seat.

[0006] Preferably, the shape and size of the end face of the vertical section is consistent with the shape and size of the end face of the bottom end of the valve core, and the shape and size of the end face of the vertical section is consistent with the shape and size of the cross section of the inner cavity of the valve seat.

[0007] Preferably, the sealing surface is a sealing surface formed by providing a chamfer at the bottom end of the valve core and contacting the inner side surface of the top of the valve seat.

[0008] Preferably, the cross-sectional area of ​​the buffer section is larger than the cross-sectional area of ​​the sleeve.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention provides an axial protrusion structure at the bottom end of the valve core, which can effectively reduce the direct scouring effect of the medium on the valve core sealing surface, reduce the erosion and wear of the valve core sealing surface by the medium, and protect the integrity of the valve core sealing surface, thereby reducing the frequency of repair or replacement of the valve core sealing surface, extending the service life of the valve core, and economically reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of an existing regulating valve;

[0012] Figure 2 for Figure 1 Enlarged schematic diagram of the middle valve core;

[0013] Figure 3 It is a schematic diagram of the working process of the existing regulating valve when the medium flows through the valve core;

[0014] Figure 4 This is a schematic diagram of an erosion-resistant sealing structure of a regulating valve of the present invention;

[0015] Figure 5 for Figure 4 Enlarged schematic diagram of the middle valve core;

[0016] Figure 6 It is a schematic diagram of the working process when the medium of the present invention flows through the valve core. DETAILED DESCRIPTION

[0017] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0018] like Figure 4 and Figure 5As shown, an erosion-resistant sealing structure of a regulating valve of the present invention comprises a valve body 1, a valve seat 2, a valve core 3, and a sleeve 4 matched with the valve core 3. A flow channel for medium to pass through is processed inside the valve body 1. The flow channel comprises an inflow section 1-1, a buffer section 1-2, a valve cavity section 1-3, and an outflow section 1-4. The cross-sectional area of ​​the buffer section 1-2 is larger than the cross-sectional areas of the inflow section 1-1, the valve cavity section 1-3, and the outflow section 1-4. A valve seat 2 is installed at the outlet of the valve cavity section 1-3. The sleeve 4 is installed in the buffer section 1-2, the cross-sectional area of ​​the buffer section 1-2 is larger than the cross-sectional area of ​​the sleeve 4, the valve core 3 passes through the valve cavity section 1-3 and the sleeve 4 and is located in the valve cavity section 1-3 and the sleeve 4, the bottom end of the valve core 3 is located at the outlet of the valve cavity section 1-3, and a chamfer 3-1 is processed at the bottom end of the valve core 3. The chamfer 3-1 of the valve core 3 contacts the inner side surface of the top of the valve seat 2 to form a sealing surface, which is used to seal the bottom end of the valve core 3 and the outlet of the valve cavity section 1-3. The bottom end of the valve core 3 is processed with an axial protrusion structure 5, which protrudes from the bottom end of the valve core 3 and is located in the valve seat 2 and cooperates with the valve seat 2. The axial protrusion structure 5 includes a vertical section 5-1 and an arc section 5-2. The vertical section 5-1 is perpendicular to the bottom end face of the valve core 3 and connected to the bottom end of the valve core 3. The shape and size of the end face of the vertical section 5-1 are consistent with the shape and size of the bottom end face of the valve core 3. The shape and size of the end face of the vertical section 5-1 are consistent with the shape and size of the cross section of the inner cavity of the valve seat 2. The arc section 5-2 is smoothly transitioned and connected to the vertical section 5-1 and is located in the valve seat 2.

[0019] The axial protrusion structure 5 is a component of the valve core 3 and can be integrally formed with the valve core 3. When the valve of the valve body 1 is closed, the axial protrusion structure 5 of the valve core 3 is placed at the inner cavity flow channel of the sealing surface of the valve seat 2, that is, at the valve cavity section 1-3. The axial protrusion structure 5 of the valve core 3 can play a guiding and throttling role; Figure 6As shown, in the process of opening the valve, the axial protrusion structure 5 of the valve core 3 is placed in the inner cavity flow channel of the valve seat 2 at the beginning. When the axial protrusion structure 5 of the valve core 3 has not left the valve seat 2, the axial protrusion structure 5 has not yet opened, and no medium flows through the sealing surface of the valve core 3. Therefore, there is no medium force to flush the sealing surface, and there is no erosion and wear on the sealing surface; as the valve is further opened, when the vertical section 5-1 of the axial protrusion structure 5 of the valve core 3 completely leaves the valve seat, the medium begins to flow out from the middle cavity of the labyrinth sleeve 4. At this time, there is a certain amount of space between the sealing surface of the valve core 3 and the sealing surface of the valve seat 2, and the medium directly flushes the axial protrusion structure 5 of the valve core 3 after passing through the middle cavity of the labyrinth sleeve 4, and then flows out through the outlet flow channel 6 of the valve body 1, and there is no direct flushing effect on the sealing surface of the valve core 3. In this way, the erosion and wear of the sealing surface of the valve core 3 by the medium can be effectively reduced, and the sealing surface can be protected. During the process of closing the valve, the medium initially flows out through the axial protruding structure 5 of the valve core 3, flushing the axial protruding structure 5, but not directly flushing the sealing surface, so there is no erosion and wear on the sealing surface of the valve core 3, which can effectively protect the sealing surface of the valve core 3; as the valve is further closed, the axial protruding structure 5 of the valve core 3 is closed to the sealing surface of the valve seat 2, and the medium no longer flows out and no longer erodes the valve core 3. At this time, the valve core 3 continues to be closed, and there is no medium flushing on the sealing surface, so the valve core 3 is no longer eroded by the medium.

Claims

1. An erosion-resistant sealing structure for a regulating valve, characterized in that: The invention comprises a valve body (1), a valve seat (2), a valve core (3), and a sleeve (4) matched with the valve core (3); a flow channel for medium to pass through is arranged in the valve body (1); the flow channel comprises an inflow section (1-1), a buffer section (1-2), a valve cavity section (1-3) and an outflow section (1-4); the cross-sectional area of ​​the buffer section (1-2) is larger than the cross-sectional areas of the inflow section (1-1), the valve cavity section (1-3) and the outflow section (1-4); a valve seat (2) is arranged at the outlet of the valve cavity section (1-3); The sleeve (4) is arranged in the buffer section (1-2), the valve core (3) is arranged in the valve cavity section (1-3) and the sleeve (4), the bottom end of the valve core (3) is located at the outlet of the valve cavity section (1-3), the bottom end of the valve core (3) and the outlet of the valve cavity section (1-3) are in contact with the valve seat (2) to form a sealing surface, and the bottom end of the valve core (3) is provided with an axial protrusion structure (5), the axial protrusion structure (5) protrudes from the bottom end of the valve core (3) and is located in the valve seat (2) and cooperates with the valve seat (2); The axial protruding structure (5) comprises a vertical section (5-1) and a circular arc section (5-2), wherein the vertical section (5-1) is perpendicular to the bottom end surface of the valve core (3) and connected to the bottom end of the valve core (3), and the circular arc section (5-2) is smoothly transitionally connected to the vertical section (5-1) and is located inside the valve seat (2); When the valve of the valve body (1) is closed, the axial protruding structure (5) of the valve core (3) is placed in the inner cavity flow channel of the sealing surface of the valve seat (2), that is, in the valve cavity section (1-3), and the axial protruding structure (5) of the valve core (3) plays a guiding and throttling role; in the process of opening the valve, the axial protruding structure (5) of the valve core (3) is initially placed in the inner cavity flow channel of the valve seat (2), when the axial protruding structure (5) of the valve core (3) has not left the valve seat (2), the axial protruding structure (5) has not yet opened, no medium flows through the sealing surface of the valve core (3), and therefore no medium force is applied to flush the sealing surface. On the sealing surface, there is no erosion and wear effect on the sealing surface; as the valve is further opened, when the vertical section (5-1) of the axial protruding structure (5) of the valve core (3) completely leaves the valve seat, the medium begins to flow out from the middle cavity of the labyrinth sleeve (4), at which time there is a certain amount of space between the sealing surface of the valve core (3) and the sealing surface of the valve seat (2), and the medium directly flushes on the axial protruding structure (5) of the valve core (3) after passing through the middle cavity of the labyrinth sleeve (4), and then flows out through the outlet flow channel (6) of the valve body (1), without directly flushing the sealing surface of the valve core (3).

2. The erosion-resistant sealing structure of a regulating valve according to claim 1, characterized in that: The shape and size of the end face of the vertical section (5-1) are consistent with the shape and size of the bottom end face of the valve core (3), and the shape and size of the end face of the vertical section (5-1) are consistent with the shape and size of the cross section of the inner cavity of the valve seat (2).

3. The erosion-resistant sealing structure of a regulating valve according to claim 1, characterized in that: The sealing surface is a sealing surface formed by the chamfer (3-1) provided at the bottom end of the valve core (3) contacting the inner side surface of the top of the valve seat (2).

4. The erosion-resistant sealing structure of a regulating valve according to claim 1, characterized in that: The cross-sectional area of ​​the buffer section (1-2) is greater than the cross-sectional area of ​​the sleeve (4).

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