Anti-pollution structure for sealing valve port of cone valve

Abstract

The anti-pollution structure comprises a valve sleeve, the valve sleeve is provided with a liquid inlet and a working port, a valve rod is inserted in the valve sleeve in a guiding mode in the front-back direction, the valve port communicated with the liquid inlet and the working port is formed in the inner side wall of the valve sleeve, an annular step is arranged on the outer side wall of the valve rod, and the valve port is matched with the conical surface of the annular step. An outer filtering ring table is arranged at the position, between the valve port and the liquid inlet, of the inner side wall of the valve sleeve, the inner side wall face of the outer filtering ring table is a first matching ring face, an inner filtering ring table is arranged at the position, located on the rear side wall of the annular step, of the valve rod, and the outer side wall face of the inner filtering ring table is a second matching ring face. The diameter of the first matching ring surface is larger than that of the second matching ring surface, and in the process that the valve port is closed along with the movement of the valve rod towards the valve port, a tolerance clearance fit section is formed between the second matching ring surface and the first matching ring surface. And the conical matching surface is prevented from being damaged and scratched, the sealing reliability is ensured, and wide applicability and high reliability are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve equipment, and in particular to an anti-pollution structure for sealing a cone valve port. Background Art

[0002] The sealing reliability and stability of the electro-hydraulic main valve used in the hydraulic support of coal mines affect the performance of the hydraulic support. The valve string of the electro-hydraulic main valve in the prior art includes a valve sleeve and a valve stem arranged in the valve sleeve. A conical valve port is provided on the inner wall of the valve sleeve, and an annular step is provided on the outer wall of the stem of the valve stem. The outer peripheral surface of the annular step is a conical surface, which can fit with the conical valve port when moving toward the valve port, thereby sealing the cone valve. When the existing cone valve is used in the electro-hydraulic main valve, a liquid inlet is provided on the side wall of the valve sleeve, and the valve stem is movably inserted in the valve sleeve along the front-to-back direction. The front end of the valve sleeve has a working port, and the valve sleeve and the valve stem cooperate through the conical valve port and the annular step to realize the on-off control between the liquid inlet and the working port.

[0003] When working, the cone valve port is opened, the working port is connected to the liquid inlet, and after the liquid is inlet, the cone valve port is closed. The two sealing surfaces of the valve port and the annular step continuously reduce the flow cross section of the valve port as the liquid flows until the sealing surfaces are in contact and closed. During the liquid inlet process and the moment of closing, iron filings, impurities and other contaminants in the liquid can easily get stuck in the conical surface of the valve port, causing damage to the main sealing surface, scratches and seal failure. In the prior art, a corresponding filtering device or filtering structure is generally set outside the valve string to perform preliminary filtering of the liquid, which will undoubtedly increase the cost of the equipment. Summary of the invention

[0004] The object of the present invention is to provide an anti-pollution structure for sealing a cone valve port, so as to solve the problem in the prior art that the sealing performance of the cone surface of the valve body is affected by the impurity iron filings in the liquid, resulting in sealing failure.

[0005] In order to solve the above problems, the anti-pollution structure for cone valve port sealing involved in the present invention adopts the following technical solutions: An anti-pollution structure for sealing a cone valve port, comprising a valve sleeve, the valve sleeve having a liquid inlet and a working port, a valve stem being inserted into the valve sleeve along a front-to-rear direction, a valve port connecting the liquid inlet and the working port being provided on the inner side wall of the valve sleeve, an annular step being provided on the outer side wall of the valve stem, the valve port being matched with the conical surface of the annular step, an outer filter ring platform being provided on the inner side wall of the valve sleeve at a position between the valve port and the liquid inlet, the inner side wall surface of the outer filter ring platform being a first matching ring surface, an inner filter ring platform being provided on the rear side wall of the valve stem located at the annular step, the outer side wall surface of the inner filter ring platform being a second matching ring surface, the diameter of the first matching ring surface being greater than the diameter of the second matching ring surface, and in the process of closing the valve port by following the movement of the valve stem toward the valve port, a tolerance clearance matching section is provided between the second matching ring surface and the first matching ring surface.

[0006] In a preferred embodiment, the cross-sectional area of ​​the gap between the first mating annular surface and the second mating annular surface is smaller than the cross-sectional area of ​​the liquid inlet.

[0007] In a preferred embodiment, the first mating annular surface and the second mating annular surface are both cylindrical surfaces, and the front and rear integral mating surfaces of the two constitute the tolerance clearance mating section.

[0008] In a preferred embodiment, the outer edge of the rear end surface of the first mating annular surface and / or the outer edge of the front end surface of the second mating annular surface has a rounded structure.

[0009] In a preferred embodiment, the first mating annular surface is a cylindrical surface, and the second mating annular surface is a drum-shaped surface protruding from the middle part along the front-to-back direction toward the inner side wall of the first mating annular surface, and the large diameter position of the drum-shaped surface constitutes the tolerance clearance mating section.

[0010] In a preferred embodiment, the front end of the valve sleeve is coaxially assembled with a valve seat, the front end of the valve seat is coaxially assembled with an end sleeve, the front end of the end sleeve is coaxially assembled with a screw plug, the front end of the valve stem passes through the valve seat and is inserted into the end sleeve, the front end of the valve stem is externally sleeved with a piston, the piston is sealingly and slidingly assembled with the end sleeve, and a liquid outlet is opened on the valve stem.

[0011] As described above, the present invention has the following beneficial effects: compared with the prior art, the anti-pollution structure for the cone valve port seal involved in the present invention, in actual use, in front of the valve port seal of the cone valve, an outer filter ring and an inner filter ring are added, and the two are clearance-matched, during the process of closing the valve port seal, the cross-sectional area of ​​the valve port gradually decreases, and at this time, the valve stem and the valve sleeve are always in a tolerance clearance fit state, so that the pollutants gathered on the outside of the cone seal can be effectively blocked behind the valve port, at this time, the gap generated by the clearance fit can still flow, the gap liquid can directly enter between the cone valve port and the cone surface, and the pollutants are blocked outside by the filter ring, and a filtering structure can be formed by the cone valve itself, so as to realize effective separation of impurities, iron filings and liquid in the liquid, avoid damage and scratches on the cone fitting surface, ensure sealing reliability, and have wide applicability and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for use in the embodiment: Figure 1 It is a schematic structural diagram of a specific embodiment of the anti-pollution structure for cone valve port sealing of the present invention; Figure 2 for Figure 1 A local enlarged view of point A; Figure 3for Figure 2 Status diagram of the middle valve port seal; Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0013] Explanation of the reference numerals: 1-valve sleeve; 2-valve stem; 3-valve seat; 4-end sleeve; 5-screw plug; 6-piston; 7-liquid inlet; 8-working port; 9-liquid outlet; 10-spring; 11-valve port; 12-inner filter ring; 21-annular step; 22-outer filter ring; 23-tolerance clearance fitting section; 24-conical sealing surface. DETAILED DESCRIPTION

[0014] In order to make the technical purpose, technical solution and beneficial effects of the present invention clearer, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown herein can be arranged and designed in various different configurations.

[0015] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, which can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0017] The specific embodiment of the anti-pollution structure for cone valve port sealing of the present invention is as follows: Figures 1 to 4As shown, in the present embodiment, the anti-pollution structure for sealing the conical valve port is applied to the electro-hydraulic main valve string. Of course, in other embodiments, the anti-pollution structure is also applied to the sealing of the conical valve ports of other hydraulic valves, including but not limited to single and double-way locks, hydraulically controlled one-way valves, etc.

[0018] In this embodiment, the electro-hydraulic main valve string includes a valve sleeve 1, and the axis of the valve sleeve 1 is defined to extend in the front-to-back direction. The inner side of the rear end of the valve sleeve 1 has a limiting step. The front end of the valve sleeve 1 has a threaded connection section, and the valve seat 3 is connected to the threaded connection section. The valve seat 3 is cylindrical as a whole. The front end of the valve seat 3 is connected to the end sleeve 4, and the front end of the end sleeve 4 is connected to the screw plug 5. The valve sleeve 1, the valve sleeve 1, the end sleeve 4, and the screw plug 5 are all coaxially arranged in the front-to-back direction. A valve stem 2 is inserted in the valve sleeve 1 to guide and move along the front-to-back direction. The front end of the valve stem 2 passes through the valve seat 3 and extends into the end sleeve 4. The front end of the valve stem 2 is externally connected to a piston 6, and the piston 6 is sealed and fitted with the inner wall of the end sleeve 4. During the process of the valve stem 2 moving forward and backward, the piston 6 moves back and forth in the end sleeve 4.

[0019] The valve sleeve 1 is provided with a liquid inlet 7 and a working port 8, wherein the liquid inlet 7 is provided on the outer wall of the valve sleeve 1, and the working port 8 is located at the front end of the valve sleeve 1. The liquid enters the gap between the valve sleeve 1 and the valve stem 2 through the liquid inlet 7, and then flows into the working port 8. The side wall of the valve stem 2 is provided with a liquid outlet 9. After the liquid enters the working port 8 through the liquid inlet 7, it is transported outward through the liquid outlet 9. A spring 10 is installed between the valve stem 2 and the valve sleeve 1.

[0020] In order to achieve the isolation of the liquid flow path, the inner wall of the valve sleeve 1 is provided with a valve port 11 connecting the liquid inlet 7 and the working port 8, and the outer wall of the valve stem 2 is provided with an annular step 21. The valve port 11 cooperates with the conical surface of the annular step 21. When the valve stem 2 is driven to move forward, the conical surface of the annular step 21 moves toward the valve port 11 and gradually seals and closes the annular space between the two, thereby isolating the flow path between the working port 8 and the liquid inlet 7.

[0021] However, since the incoming liquid contains impurities, iron filings, etc., during the closing process of the valve port 11, the impurities and iron filings are easily stuck on the conical surface of the valve port 11, resulting in sealing failure. Long-term sticking may cause damage and scratches to the main sealing surface, resulting in sealing failure.

[0022] In order to prevent the impurities and iron filings from interfering with the sealing of the valve port 11, a pre-filter structure is provided in the valve sleeve 1 to separate the liquid from the impurities.

[0023] Specifically, an outer filter ring platform 22 is provided on the inner wall of the valve sleeve 1 at a position between the valve port 11 and the liquid inlet 7, and the inner wall surface of the outer filter ring platform 22 is a first matching ring surface. An inner filter ring platform 12 is provided on the rear wall of the valve stem 2 located at the annular step 21, and the outer wall surface of the inner filter ring platform 12 is a second matching ring surface. The diameter of the first matching ring surface is greater than the diameter of the second matching ring surface. In the process of following the movement of the valve stem 2 toward the valve port 11 to close the valve port 11, a tolerance clearance matching section 23 is provided between the second matching ring surface and the first matching ring surface.

[0024] By adopting the form of the tolerance clearance fitting section 23, a pre-filter structure can be set behind the sealing position of the valve port 11. When the valve port 11 needs to be closed, the valve stem 2 moves forward. Between the annular step 21 and the valve port 11, the outer filter ring 22 and the inner filter ring 12 are coaxially sleeved to achieve tolerance clearance assembly. At this time, the valve stem 2 continues to move forward and gradually closes the valve port 11. After the liquid in the liquid inlet 7 enters the annular space between the valve sleeve 1 and the valve stem 2 through the liquid inlet 7, it first passes through the tolerance clearance fitting section 23. Due to the small size of the tolerance clearance fitting section 23, iron filings, impurities, etc. can be effectively isolated behind the tolerance clearance fitting section 23, thereby achieving effective separation of liquid and impurities. That is, in the stroke of closing the valve port 11, the outer filter ring 22 and the inner filter ring 12 are always in the tolerance clearance fitting state. Effective filtration of liquid is achieved.

[0025] At the same time, the tolerance clearance fit cross-sectional area between the first fit annular surface and the second fit annular surface is smaller than the cross-sectional area of ​​the liquid inlet 7. With this arrangement, the tolerance clearance fit section 23 can always flow during the closing process of the valve port 11. Since the cross-sectional area here is smaller than the cross-sectional area of ​​the liquid inlet 7, the flow rate of the liquid in the gap increases at this time, and the high-speed liquid can also instantly and vigorously wash away the contaminants that have entered between the tapered fit surfaces, thereby preventing the contaminants from being clamped at the junction of the tapered surfaces.

[0026] By setting the tolerance gap section, the filtration of the liquid is achieved, and at the same time the flow rate can be increased to flush the residual impurities on the conical surface, further ensuring the reliability of the seal.

[0027] Of course, in order to facilitate processing and assembly, and to ensure the integrity of filtration, the first matching annular surface and the second matching annular surface are both cylindrical surfaces, and the front and rear integral matching surfaces of the two constitute the tolerance clearance fitting section 23. The front and rear path size of the tolerance clearance fitting section 23 can be effectively extended, and the liquid filtration effect is better.

[0028] At the same time, in order to facilitate the matching and guiding of the two, the outer edge of the rear end surface of the first matching annular surface and the outer edge of the front end surface of the second matching annular surface have a chamfered structure.

[0029] In other embodiments, according to the actual impurity size and the filtering accuracy requirements, the first mating annular surface can be a cylindrical surface, and the second mating annular surface can be a drum-shaped surface protruding from the middle part along the front-to-back direction toward the inner wall of the first mating annular surface, and the large diameter position of the drum-shaped surface constitutes the tolerance clearance fitting section 23.

[0030] Working process: In the initial state, the valve port 11 is open, and the liquid entering the liquid inlet 7 enters the working port 8 through the valve port 11 and is discharged outward through the liquid outlet 9 on the valve stem 2; In the early stage of closing the valve port 11, the valve stem 2 is driven to move forward toward the valve port 11, and the inner filter ring 12 is inserted into the outer filter ring 22 during the movement of the valve stem 2. The two have a travel tolerance clearance fit, and the liquid enters the working port 8 through the gap generated by the tolerance clearance fit, and is discharged through the liquid outlet 9. At this time, the liquid passes through the tolerance clearance fit section 23 to filter the liquid and impurities, and the liquid is further accelerated to flush the conical fit surface.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate but not limit the technical solutions of the present invention, and any equivalent substitutions of the present invention and any modifications or partial substitutions that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An anti-pollution structure for sealing a cone valve port, comprising a valve sleeve, the valve sleeve having a liquid inlet and a working port, a valve stem inserted in the valve sleeve along the front-rear direction, a valve port connecting the liquid inlet and the working port on the inner side wall of the valve sleeve, an annular step on the outer side wall of the valve stem, the valve port cooperates with the conical surface of the annular step, and is characterized in that: An outer filter ring is provided on the inner wall of the valve sleeve at a position between the valve port and the liquid inlet, and the inner wall surface of the outer filter ring is a first matching ring surface. An inner filter ring is provided on the rear wall of the valve stem located at the annular step, and the outer wall surface of the inner filter ring is a second matching ring surface. The diameter of the first matching ring surface is greater than the diameter of the second matching ring surface. In the process of following the movement of the valve stem toward the valve port to close the valve port, a tolerance clearance matching section is provided between the second matching ring surface and the first matching ring surface.

2. The anti-pollution structure for cone valve port sealing according to claim 1, characterized in that: The cross-sectional area of ​​the gap between the first matching annular surface and the second matching annular surface is smaller than the cross-sectional area of ​​the liquid inlet.

3. The anti-pollution structure for cone valve port sealing according to claim 2, characterized in that: The first matching annular surface and the second matching annular surface are both cylindrical surfaces, and the front and rear integral matching surfaces of the two constitute the tolerance clearance matching section.

4. The anti-pollution structure for cone valve port sealing according to claim 3, characterized in that: The outer edge of the rear end surface of the first matching annular surface and / or the outer edge of the front end surface of the second matching annular surface has a rounded structure.

5. The anti-pollution structure for cone valve port sealing according to claim 2, characterized in that: The first matching annular surface is a cylindrical surface, and the second matching annular surface is a drum-shaped surface protruding from the middle part along the front-back direction toward the inner side wall of the first matching annular surface, and the large diameter position of the drum-shaped surface constitutes the tolerance clearance matching section.

6. The anti-pollution structure for cone valve port sealing according to claim 1, characterized in that: The front end of the valve sleeve is coaxially equipped with a valve seat, the front end of the valve seat is coaxially equipped with an end sleeve, the front end of the end sleeve is coaxially equipped with a screw plug, the front end of the valve stem passes through the valve seat and is inserted into the end sleeve, the front end of the valve stem is externally sleeved with a piston, the piston is sealingly and slidingly assembled with the end sleeve, and a liquid outlet is opened on the valve stem.

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