Straight-through type hydraulic stop valve

Abstract

The utility model discloses a straight-through type hydraulic stop valve which comprises a valve body, a piston type valve element and a valve seat, an overflowing channel is arranged in the middle of the piston type valve element in a penetrating mode, the piston type valve element is arranged in the valve body in a sliding mode, and a sliding part attached to the inner wall of the valve body is arranged on the periphery of the piston type valve element. A first cylinder seat and a second cylinder seat are installed at openings in the two ends of the valve body respectively, the inner wall of the first cylinder seat and the inner wall of the second cylinder seat are attached to the outer wall of the piston type valve element, a first cavity is formed between the first cylinder seat and the sliding part, and a second cavity is formed between the second cylinder seat and the sliding part. A first medium channel and a second medium channel which are communicated with the first cavity are formed in the side portion of the valve body in a penetrating mode, the valve seat is installed at one end of the valve body, and an overflowing hole is formed in the valve seat. The valve element is driven to move close to or away from the valve seat in a hydraulic driving mode, opening and closing of the valve are achieved, the opening and closing action is rapid, upstream medium pressure does not need to be considered, and the using reliability and convenience of the valve are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a straight-through hydraulic stop valve. Background Art

[0002] The straight-through stop valve relies on the pressure of the valve stem to tightly connect the valve disc sealing surface with the valve seat sealing surface, thereby preventing the flow of media. This design reduces the friction between the sealing surfaces during the opening and closing process of the straight-through stop valve, making it wear-resistant and with a small opening height, and has better manufacturing process performance.

[0003] The invention patent with patent application number CN201510840128.3 discloses a straight-through silent stop valve, which provides a check valve effect by arranging a spring inside the valve body. The valve is opened by the internal medium overcoming the spring preload force to push the unsealing member to move. This structure has a disadvantage, that is, when the upstream medium pressure is low, the valve cannot be opened smoothly. Therefore, it is necessary to improve the existing straight-through stop valve. Utility Model Content

[0004] The purpose of the utility model is to provide a straight-through hydraulic stop valve. The utility model adopts hydraulic drive to make the valve core move closer to or away from the valve seat to realize the opening and closing of the valve. The opening and closing action is fast and there is no need to consider the upstream medium pressure, which greatly improves the reliability and convenience of the valve.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a straight-through hydraulic stop valve, comprising a valve body, a piston-type valve core, and a valve seat, the valve body being hollow and open at both ends, a flow passage being provided through the middle of the piston-type valve core, the piston-type valve core being slidably disposed within the valve body, and a sliding portion being provided on the outer periphery of the piston-type valve core, which is in contact with the inner wall of the valve body, and a first sealing ring being provided on the outer wall of the sliding portion for forming a sealing fit with the inner wall of the valve body, a first cylinder seat and a second cylinder seat being respectively mounted at the openings at both ends of the valve body, the inner walls of the first cylinder seat and the second cylinder seat both being in contact with the outer wall of the piston-type valve core, a first chamber being provided between the first cylinder seat and the sliding portion, and a second chamber being provided between the second cylinder seat and the sliding portion, a first medium passage and a second medium passage being respectively communicated with the first chamber being provided through the side of the valve body, the valve seat being mounted at one end of the valve body, and a flow hole being provided on the valve seat, so that when the piston-type valve core is tightly abutted against the valve seat, the flow hole is blocked from the inner cavity of the valve body.

[0006] By adopting this technical solution, when oil enters the first medium channel, the oil pressure in the first chamber increases, pushing the piston valve core away from the valve seat, thereby opening the valve. When oil enters the second medium channel, the oil pressure in the second chamber increases, pushing the piston valve core toward the valve seat until the two contact each other, disconnecting the flow hole from the inner cavity of the valve body and closing the valve. This hydraulic drive system drives the valve core toward or away from the valve seat to open and close the valve. The opening and closing actions are fast and do not require consideration of upstream medium pressure, greatly improving the reliability and convenience of the valve.

[0007] The utility model is further configured such that a first step is provided on the outer wall of the first cylinder seat, a second step is provided on the inner wall of the valve body, which abuts against the first step to form a limit, the valve seat is connected to the end of the valve body by a plurality of screws, and the valve seat and the outer end of the first cylinder seat are tightly abutted against the first step on the inner wall of the valve body, so that the first step on the first cylinder seat is tightly abutted against the second step on the inner wall of the valve body; the second cylinder seat is interference-mounted in the valve body, and a third step is provided on the outer wall of the second cylinder seat, and a fourth step is provided on the inner wall of the valve body to abut against the third step to form a limit; a second sealing ring is provided on the inner and outer peripheries of the first cylinder seat, and a third sealing ring is provided on the inner and outer peripheries of the second cylinder seat.

[0008] By adopting the above technical solution, the positioning installation of the first cylinder seat and the second cylinder seat can be achieved, the installation structure is simple and reliable, the disassembly and assembly are very convenient, and the sealing performance is good.

[0009] The present utility model is further configured as follows: a first annular recess is provided at a portion where the inner wall of the valve body is in contact with the first cylinder seat, a first leakage guide hole communicating with the first annular recess is opened on the side of the valve body, and a first drainage hole is provided through a portion where the first cylinder seat is in contact with the piston-type valve core; a second annular recess is provided at a portion where the inner wall of the valve body is in contact with the second cylinder seat, a second leakage guide hole communicating with the second annular recess is opened on the side of the valve body, and a second drainage hole is provided through a portion where the second cylinder seat is in contact with the piston-type valve core.

[0010] By adopting the above technical solution, the leaked oil can be led out to the oil tank to avoid the occurrence of oil leakage.

[0011] The present invention is further configured such that when the piston valve core is against the valve seat, a pre-chamber is formed between the piston valve core, the valve seat and the first cylinder seat, the flow holes are provided in plurality, and the plurality of flow holes are distributed in a circular array on the valve seat, the flow holes are arranged at an angle, and the flow holes are communicated with the pre-chamber.

[0012] By adopting the above technical solution, when the valve is opened, the medium can pass through the valve seat evenly, which can improve the turbulent flow state of the fluid.

[0013] The utility model is further configured as follows: the piston valve core includes a valve core body and a movable sleeve, the inner wall of the valve core body is provided with a movable groove extending in the axial direction, the valve core body is slidably arranged in the movable groove, and the inner wall of the valve core body is provided with a fourth sealing ring for sealing with the outer wall of the movable groove, the valve core body is provided with an annular limiting groove at a position corresponding to the inner wall of the movable groove, the movable sleeve is provided with an axial hole in the radial direction, a cylindrical pin is interference-fitted on the axial hole, the outer end of the cylindrical pin extends into the annular limiting groove, and the axial length of the annular limiting groove is greater than the diameter of the cylindrical pin, and a preload spring is clamped between the inner end of the movable groove and the inner end of the movable sleeve.

[0014] By adopting the above technical solution, the piston valve core adopts a floating structure, which can avoid leakage caused by the valve not being able to be completely closed due to fitting tolerance, and has better sealing performance.

[0015] The utility model is further configured such that a first positioning groove is provided at an inner end of the movable groove, a second positioning groove is provided at an inner end of the movable sleeve, and both ends of the preload spring are respectively embedded in the first positioning groove and the second positioning groove.

[0016] By adopting the above technical solution, the stability of the preload spring installation can be guaranteed.

[0017] The utility model is further configured such that a process hole communicating with the annular limiting groove is opened on the side of the sliding portion, a threaded groove is provided at the outer end of the process hole, and a threaded plug is threadedly connected to the inner thread of the threaded groove.

[0018] By adopting the above technical solution, when the piston valve core needs to be disassembled and repaired, it is only necessary to unscrew the threaded plug, insert the tool into the process hole, push the cylindrical pin out of the shaft hole, and then the valve core body and the movable sleeve can be separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model when the valve is closed;

[0020] Figure 2 This is a schematic diagram of the structure of the valve of the utility model when it is open;

[0021] Figure 3 This is a schematic diagram of the structure of the piston valve core of the utility model after adopting a floating structure;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0023] Figure: 1, valve body; 2, piston valve core; 3, valve seat; 4, flow passage; 5, sliding portion; 6, first sealing ring; 7, first cylinder seat; 8, second cylinder seat; 9, first chamber; 10, second chamber; 11, first medium passage; 12, second medium passage; 13, flow hole; 14, first step; 15, second step; 16, third step; 17, fourth step; 18, second sealing ring; 19, third sealing ring; 20, first annular recess 21. First leakage hole; 22. First drainage hole; 23. Second annular recess; 24. Second leakage hole; 25. Second drainage hole; 26. Pre-chamber; 27. Valve core body; 28. Movable sleeve; 29. Movable groove; 30. Fourth sealing ring; 31. Annular limit groove; 32. Axial hole; 33. Cylindrical pin; 34. Preload spring; 35. First positioning groove; 36. Second positioning groove; 37. Process hole; 38. Threaded groove; 39. Threaded plug. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example: As shown in the attached Figure 1 and attached Figure 2The straight-through hydraulic stop valve shown in the figure includes a valve body 1, a piston valve core 2 and a valve seat 3. The valve body 1 is hollow and has openings at both ends. The middle part of the piston valve core 2 is provided with a flow channel 4. The piston valve core 2 is slidably arranged in the valve body 1, and the outer periphery of the piston valve core 2 is provided with a sliding portion 5 that fits the inner wall of the valve body 1. The outer wall of the sliding portion 5 is provided with a first sealing ring 6 for forming a sealing fit with the inner wall of the valve body 1. The first cylinder seat 7 and the second cylinder seat 8 are respectively installed at the openings at both ends of the valve body 1. The first The inner walls of the cylinder seat 7 and the second cylinder seat 8 are both in contact with the outer wall of the piston valve core 2. A first chamber 9 is provided between the first cylinder seat 7 and the sliding portion 5, and a second chamber 10 is provided between the second cylinder seat 8 and the sliding portion 5. A first medium passage 11 and a second medium passage 12 are respectively provided through the side of the valve body 1, communicating with the first chamber 9. The valve seat 3 is mounted on one end of the valve body 1 and has a flow hole 13 formed therein. When the piston valve core 2 and the valve seat 3 are in close contact, the flow hole 13 is blocked from the inner cavity of the valve body 1. When oil flows into the first medium passage 11, the oil pressure in the first chamber 9 increases, pushing the piston valve core 2 away from the valve seat 3, thereby opening the valve. When oil flows into the second medium passage 12, the oil pressure in the second chamber 10 increases, pushing the piston valve core 2 toward the valve seat 3, until the two abut, disconnecting the flow hole 13 from the inner cavity of the valve body 1 and closing the valve. It uses hydraulic drive to make the valve core move closer to or away from the valve seat 3 to open and close the valve. The opening and closing actions are fast and there is no need to consider the upstream medium pressure, which greatly improves the reliability and convenience of the valve.

[0026] As attached Figure 1 and attached Figure 2 As shown, the outer wall of the first cylinder seat 7 is provided with a first step 14, and the inner wall of the valve body 1 is provided with a second step 15 that abuts against the first step 14 to form a limit. The valve seat 3 is connected to the end of the valve body 1 via multiple screws, and the valve seat 3 abuts against the outer end of the first cylinder seat 7, causing the first step 14 on the first cylinder seat 7 to abut against the second step 15 on the inner wall of the valve body 1. The second cylinder seat 8 is interference-fitted within the valve body 1, and the outer wall of the second cylinder seat 8 is provided with a third step 16. The inner wall of the valve body 1 is provided with a fourth step 17 that abuts against the third step 16 to form a limit. Second sealing rings 18 are provided on both the inner and outer circumferences of the first cylinder seat 7, and third sealing rings 19 are provided on both the inner and outer circumferences of the second cylinder seat 8. This design allows for the positioning and installation of the first and second cylinder seats 7 and 8, resulting in a simple and reliable installation structure, convenient assembly and disassembly, and excellent sealing performance.

[0027] As attached Figure 1 and attached Figure 2As shown, the area where the inner wall of the valve body 1 contacts the first cylinder seat 7 is provided with a first annular recess 20. A first leak guide hole 21 communicating with the first annular recess 20 is formed on the side of the valve body 1. A first drainage hole 22 is provided through the area where the first cylinder seat 7 contacts the piston valve core 2. A second annular recess 23 is provided on the inner wall of the valve body 1 contacting the second cylinder seat 8. A second leak guide hole 24 communicating with the second annular recess 23 is formed on the side of the valve body 1. A second drainage hole 25 is provided through the area where the second cylinder seat 8 contacts the piston valve core 2. This design allows leaked oil to be directed to the oil tank, preventing it from leaking out.

[0028] As attached Figure 1 As shown, when the piston valve core 2 abuts the valve seat 3, a pre-chamber 26 is formed between the piston valve core 2, the valve seat 3, and the first cylinder seat 7. Multiple flow holes 13 are provided, distributed in a circular array on the valve seat 3. The flow holes 13 are arranged at an angle and communicate with the pre-chamber 26. When the valve is open, the medium can evenly pass through the valve seat 3, thereby reducing the turbulent flow of the fluid.

[0029] As attached Figure 3 and attached Figure 4 As shown, the piston valve core 2 includes a valve core body 27 and a movable sleeve 28, and the inner wall of the valve core body 27 is provided with a movable groove 29 extending in the axial direction, and the valve core body 27 is slidably set in the movable groove 29, and the outer circular surface of the valve core body 27 is tightly fitted with the inner circular surface of the movable groove 29, and the inner wall of the valve core body 27 is provided with a fourth sealing ring 30 for sealing with the outer wall of the movable groove 29, and the valve core body 27 is provided with an annular limiting groove 31 at a position corresponding to the inner wall of the movable groove 29, and the movable sleeve 28 is provided with an axial hole 32 in the radial direction, and a cylindrical pin 33 is interference-fitted on the axial hole 32, and the outer end of the cylindrical pin 33 extends into the annular limiting groove 31, and the axial length of the annular limiting groove 31 is greater than the diameter of the cylindrical pin 33, and a preload spring 34 is clamped between the inner end of the movable groove 29 and the inner end of the movable sleeve 28. The piston valve core 2 adopts a floating structure, which can avoid leakage caused by the valve not being able to be completely closed due to fitting tolerance, and has better sealing performance.

[0030] As attached Figure 4 As shown, the inner end of the movable groove 29 is provided with a first positioning groove 35, and the inner end of the movable sleeve 28 is provided with a second positioning groove 36. The two ends of the preload spring 34 are respectively embedded in the first positioning groove 35 and the second positioning groove 36. This design can ensure the stability of the installation of the preload spring 34.

[0031] As attached Figure 4As shown, a process hole 37 is formed on the side of the sliding portion 5 and communicates with the annular limiting groove 31. A threaded groove 38 is formed at the outer end of the process hole 37. A threaded plug 39 is threadedly connected to the inner thread of the threaded groove 38. The outer end of the threaded plug 39 has a hexagonal socket. To disassemble and repair the piston valve core 2, simply unscrew the threaded plug 39, insert a tool into the process hole 37, and push the cylindrical pin 33 out of the shaft hole 32 to separate the valve core body 27 and the movable sleeve 28.

Claims

1. Straight-through hydraulic stop valve, characterized by: The invention comprises a valve body (1), a piston valve core (2) and a valve seat (3), wherein the valve body (1) is hollow and has openings at both ends, a flow passage (4) is provided through the middle of the piston valve core (2), the piston valve core (2) is slidably arranged in the valve body (1), and a sliding portion (5) is provided on the outer periphery of the piston valve core (2) and is fitted with an inner wall of the valve body (1), and a first sealing ring (6) is provided on the outer wall of the sliding portion (5) for forming a sealing fit with the inner wall of the valve body (1), and a first cylinder seat (7) and a second cylinder seat (8) are respectively installed at the openings at both ends of the valve body (1), and the first cylinder seat (7) and the second cylinder seat The inner walls of (8) are in contact with the outer wall of the piston valve core (2), and a first chamber (9) is provided between the first cylinder seat (7) and the sliding portion (5), and a second chamber (10) is provided between the second cylinder seat (8) and the sliding portion (5). The side of the valve body (1) is provided with a first medium channel (11) and a second medium channel (12) which are respectively connected to the first chamber (9). The valve seat (3) is installed at one end of the valve body (1), and a flow hole (13) is provided on the valve seat (3). When the piston valve core (2) and the valve seat (3) are pressed against each other, the flow hole (13) and the inner cavity of the valve body (1) are blocked.

2. The straight-through hydraulic stop valve according to claim 1, characterized in that: The outer wall of the first cylinder seat (7) is provided with a first step (14), and the inner wall of the valve body (1) is provided with a second step (15) which abuts against the first step (14) to form a limit. The valve seat (3) is connected to the end of the valve body (1) through a plurality of screws, and the valve seat (3) abuts against the outer end of the first cylinder seat (7), so that the first step (14) on the first cylinder seat (7) and the second step (15) on the inner wall of the valve body (1) abut against each other. The second cylinder seat (8) is interference-mounted in the valve body (1), and the outer wall of the second cylinder seat (8) is provided with a third step (16), and the inner wall of the valve body (1) is provided with a fourth step (17) which abuts against the third step (16) to form a limit. The inner and outer peripheries of the first cylinder seat (7) are both provided with a second sealing ring (18), and the inner and outer peripheries of the second cylinder seat (8) are both provided with a third sealing ring (19).

3. The straight-through hydraulic stop valve according to claim 1, characterized in that: A first annular recess (20) is provided at the portion where the inner wall of the valve body (1) is in contact with the first cylinder seat (7); a first leakage guide hole (21) communicating with the first annular recess (20) is provided on the side of the valve body (1); a first drainage hole (22) is provided through the portion where the first cylinder seat (7) is in contact with the piston valve core (2); a second annular recess (23) is provided at the portion where the inner wall of the valve body (1) is in contact with the second cylinder seat (8); a second leakage guide hole (24) communicating with the second annular recess (23) is provided on the side of the valve body (1); a second drainage hole (25) is provided through the portion where the second cylinder seat (8) is in contact with the piston valve core (2).

4. The straight-through hydraulic stop valve according to claim 1, characterized in that: When the piston valve core (2) and the valve seat (3) abut against each other, a pre-chamber (26) is formed between the piston valve core (2), the valve seat (3) and the first cylinder seat (7); the flow holes (13) are multiple, and the multiple flow holes (13) are distributed in a circular array on the valve seat (3); the flow holes (13) are arranged in an inclined manner, and the flow holes (13) are connected to the pre-chamber (26).

5. The straight-through hydraulic stop valve according to claim 1, characterized in that: The piston valve core (2) includes a valve core body (27) and a movable sleeve (28), the inner wall of the valve core body (27) is provided with a movable groove (29) extending in the axial direction, the valve core body (27) is slidably arranged in the movable groove (29), and the inner wall of the valve core body (27) is provided with a fourth sealing ring (30) for forming a sealing match with the outer wall of the movable groove (29), the valve core body (27) is provided with an annular limiting groove (31) at a position corresponding to the inner wall of the movable groove (29), the movable sleeve (28) is provided with an axial hole (32) in the radial direction, a cylindrical pin (33) is interference-fitted on the axial hole (32), the outer end of the cylindrical pin (33) extends into the annular limiting groove (31), and the axial length of the annular limiting groove (31) is greater than the diameter of the cylindrical pin (33), and a preload spring (34) is clamped between the inner end of the movable groove (29) and the inner end of the movable sleeve (28).

6. The straight-through hydraulic stop valve according to claim 5, characterized in that: The inner end of the movable groove (29) is provided with a first positioning groove (35), the inner end of the movable sleeve (28) is provided with a second positioning groove (36), and the two ends of the preload spring (34) are respectively embedded in the first positioning groove (35) and the second positioning groove (36).

7. The straight-through hydraulic stop valve according to claim 5, characterized in that: A process hole (37) communicating with the annular limiting groove (31) is provided on the side of the sliding portion (5); a threaded groove (38) is provided at the outer end of the process hole (37); and a threaded plug (39) is connected to the inner thread of the threaded groove (38).

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