Hydraulic rapid adjusting piston assembly

Abstract

The hydraulic rapid adjusting piston assembly comprises a piston and a valve plate fixed to the lower portion of the piston, the piston is provided with a pressurization channel and a pressure relief channel, the upper end of the pressurization channel and the upper end of the pressure relief channel are both located on the upper surface of the piston, and the lower end of the pressurization channel is located on the right side wall of the piston. The lower end of the pressure relief channel is located on the lower surface of the piston, the valve plate does not shield an opening in the lower end of the pressure relief channel, meanwhile, the upper portion of the piston is connected with a rotating plate in a pivoted mode, an arc-shaped groove is formed in the lower surface of the rotating plate, and the arc-shaped groove is matched with the upper end of the pressurization channel and the upper end of the pressure relief channel. The method has the advantage that the preparation and maintenance difficulty of the stop valve can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a hydraulic quick-adjusting piston assembly. Background Art

[0002] In order to make the stop valve more labor-saving when opening and closing, especially in the initial stages of opening and closing, the applicant has made a number of improvements to the traditional stop valve. Among them, the improved non-return hydraulic valve includes a valve body, the middle part of which has a valve cavity, and the right part of the valve body is provided with a water inlet and the left part is provided with a water outlet, the water inlet and the water outlet are connected through a cut-off surface channel, and the cut-off surface channel is located at the lower opening of the valve cavity; a pressurizing channel and a pressure relief channel are provided on the side wall of the valve body, the pressurizing channel connects the water inlet and the valve cavity, and the pressure relief channel connects the valve cavity and the water outlet; a piston is provided in the valve cavity that can move up and down and divide the valve cavity into an upper cavity and a lower cavity, the lower part of the piston is provided with a valve plate that matches the cut-off surface channel, and the piston is provided with an elastic device that makes it have a downward displacement tendency; the valve cavity A fixed plate and a rotating plate pressed against each other are provided inside, a pressurizing hole and a pressure relief hole are provided on the fixed plate, and a pressurizing slot and a pressure relief slot which are both transparent from top to bottom are provided on the rotating plate. At the same time, the upper end of the pressurizing hole is connected to the pressurizing channel, the lower end of the pressurizing hole matches the upper end of the pressurizing slot, the upper end of the pressure relief hole is connected to the pressure relief channel, and the lower end of the pressure relief hole matches the upper end of the pressure relief slot; a rotatable valve stem is provided on the valve body, the valve stem is connected to a driving member, and one end of the valve stem is connected to the rotating plate; the cross-sections of the pressurizing slot and the pressure relief slot are both arc-shaped, and from one end of the arc to the other end, the distance between the two side walls of the pressurizing slot and the pressure relief slot gradually decreases. The elastic device generally adopts a compression spring; the driving member is generally an actuator. Such a stop valve plays a role in regulating water pressure by adjusting the amount of water flowing through the water inlet channel and the water outlet channel, making the movement of the piston more stable, slowing down the force of the valve plate opening and closing the cutoff surface channel, making it smoother whether opening or closing, ensuring the stability of the check hydraulic valve.

[0003] However, in actual use, it was found that the stop valve still has the following defects: 1. The pressure channel and the pressure relief channel need to be processed and formed as a whole with the valve body, and generally extend to the valve cover. The valve body is usually thin, long and hollow, making the valve body, which is already difficult to process, even more difficult to form, and reducing the yield rate. 2. The piston generally requires a special process to make it non-rotatable relative to the valve cavity, which is relatively complicated. Summary of the invention

[0004] The object of the present invention is to provide a hydraulic quick-adjusting piston assembly, which has the characteristics of being able to effectively reduce the difficulty of preparing and maintaining a stop valve.

[0005] The technical solution adopted by the present invention is: a hydraulic quick-adjustment piston assembly, including a piston and a valve plate fixed at the lower part thereof, the piston is provided with a pressurizing channel and a pressure relief channel, the upper ends of the pressurizing channel and the pressure relief channel are both located on the upper surface of the piston, the lower end of the pressurizing channel is located on the right side wall of the piston, the lower end of the pressure relief channel is located on the lower surface of the piston, the valve plate does not block the lower end opening of the pressure relief channel, and at the same time, a rotating plate is pivotally connected to the upper part of the piston, and an arc groove is provided on the lower surface of the rotating plate, and the arc groove matches the upper ends of the pressurizing channel and the upper ends of the pressure relief channel.

[0006] A fixing plate is fixed on the upper part of the piston, and a pressurizing through hole whose lower part is connected to the upper end of the pressurizing channel and a pressure relief through hole whose lower part is connected to the upper end of the pressure relief channel are provided on the fixing plate, and the upper end of the pressurizing through hole and the upper end of the pressure relief through hole match the arc groove.

[0007] A through hole is arranged in the middle of the valve plate, and the valve plate is fixed to the lower end surface of the piston by a bolt passing through the through hole from bottom to top.

[0008] The advantages of the present invention are that it can effectively reduce the difficulty of preparing and maintaining the stop valve. The piston of the hydraulic quick-adjusting piston assembly of the present invention is directly formed with a pressurizing channel and a pressure relief channel, which is relatively simple compared to processing the pressurizing channel and the pressure relief channel on the valve body of the stop valve, reduces the difficulty of manufacturing the valve body, and ensures the overall yield rate of the stop valve. During later maintenance, the piston can be easily taken out for replacement or reprocessing, which is not only convenient, but also reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0010] Figure 1 is a front sectional view of a hydraulic quick-adjusting piston assembly according to an embodiment of the present invention when applied to a stop valve;

[0011] Figure 2 Compared to Figure 1 An enlarged front cross-sectional view of an exploded state of a hydraulic quick adjustment piston assembly of an embodiment of the present invention;

[0012] Figure 3 and Figure 4 They are bottom views of the fixed plate and the rotating plate of the present invention respectively;

[0013] FIG. 5 is a schematic diagram of the adjustment principle of the hydraulic quick-adjustment piston assembly according to an embodiment of the present invention when applied to a stop valve.

[0014] In the figure:

[0015] 10. valve body, 11. water inlet, 12. water outlet, 13. valve cavity, 14. cut-off surface channel;

[0016] 20. Piston, 21. Pressurization channel, 22. Pressure relief channel, 23. Valve plate, 24. Compression spring;

[0017] 31. fixed plate, 311. pressurizing through hole, 312. pressure relief through hole, 32. rotating plate, 321. arc groove;

[0018] 40. Valve stem. DETAILED DESCRIPTION

[0019] For example, see Figures 1 to 4 Shown: Hydraulic quick-adjusting piston assembly, only used on the stop valve.

[0020] The stop valve comprises a valve body 10. The valve body 10 has a valve cavity 13 in the middle, and a water inlet 11 is provided on the right side of the valve body 10, and a water outlet 12 is provided on the left side. The water inlet 11 and the water outlet 12 are connected through a cut-off surface channel 14, and the cut-off surface channel 14 is located at the lower opening of the valve cavity 13. Usually, the cross section of the valve cavity 13 is cylindrical, elliptical, etc., and the cut-off surface channel 14 is located at the lower opening of the valve cavity 13. That is, the cut-off surface channel 14 is preferably the lower opening of the valve cavity 13, and the water inlet 11 is connected to the lower part of the side wall of the valve cavity 13.

[0021] The valve cavity 13 is provided with a piston 20 that can move up and down. Obviously, a sealing ring must be embedded on the circumferential surface of the piston 20. The lower part of the piston 20 is provided with a valve plate 23 that matches the cut-off surface channel 14. That is, after the piston 20 moves up and down, it drives the valve plate 23 to move up and down to open or close the cut-off surface channel 14, so as to achieve the connection or cut-off of the water inlet 11 and the water outlet 12. The piston 20 is equipped with a compression spring 24 that makes it have a downward displacement tendency. Usually, the two ends of the compression spring 24 are respectively pressed against the upper part of the valve cavity 13 and the upper end surface of the piston 20.

[0022] The stop valve further includes a pressurizing channel 21 and a pressure relief channel 22. The lower end of the pressurizing channel 21 is connected to the water inlet 11, and the lower end of the pressure relief channel 22 is connected to the water outlet 12.

[0023] The stop valve also includes a rotating plate 32. An arc groove 321 is provided on the lower surface of the rotating plate 32, and the upper part of the arc groove 321 and the upper part of the valve cavity 13 (the so-called upper part of the valve cavity refers to the valve cavity 13 being located in the upper area of ​​the piston 20. The same below) are connected. For example, a small hole whose upper end is connected to the upper part of the valve cavity 13 is provided in the middle part of the arc groove 321. The center of the arc groove 321 is generally located on the axis line of the valve cavity 13, that is, the rotation axis of the rotating plate 32 coincides with the axis line of the valve cavity 13. The arc groove 321 matches the upper end of the pressurization channel 21 and the upper end of the pressure relief channel 22. That is, after the rotating plate 32 rotates, the downward projection of the upper end of the pressurizing channel 21 can fall within the downward projection range of the arc groove 321, or the downward projection of the upper end of the pressure relief channel 22 can fall within the downward projection range of the arc groove 321, or the downward projection of the upper end of the pressurizing channel 21 and the upper end of the pressure relief channel 22 can both fall within the downward projection range of the arc groove 321.

[0024] The valve body 10 is provided with a rotatable valve stem 40, and the upper end of the valve stem 40 is connected to a driving member (not shown in the figure). The lower end of the valve stem 40 is connected to the rotating plate 32 so as to drive the rotating plate 32 to rotate by an angle not exceeding 180°. Generally speaking, the valve stem 40 can drive the rotating plate 32 to rotate by an angle not exceeding the curvature of the arc groove 321. A more optimized method is that the curvature of the arc groove 321 is 90°, so that the rotating plate 32 rotates by an angle not exceeding 90° under the drive of the valve stem 40.

[0025] More specifically:

[0026] In this embodiment, the hydraulic quick-adjustment piston assembly includes a piston 20, and components such as a fixed plate 31 and a rotating plate 32 described below.

[0027] The pressurizing channel 21 and the pressure relief channel 22 are provided on the piston 20, the rotating plate 32 is pivotally connected to the upper part of the piston 20, and the piston 20 cannot rotate compared to the valve chamber 13. Obviously, the lower end opening of the pressurizing channel 21 must be located on the right side wall of the piston 20, the lower end opening of the pressure relief channel 22 must be located on the lower end surface of the piston 20, and the valve plate 23 cannot cover the lower end opening of the pressure relief channel 22. In this way, the pressurizing channel 21 and the pressure relief channel 22 are integrated on the piston 20, which reduces the difficulty of manufacturing the valve body 10, and the piston 20 is relatively easy to form and process, thereby ensuring the overall yield rate of the product. During later maintenance, the piston 20 can be easily taken out for replacement or reprocessing, which is not only convenient, but also reduces maintenance costs.

[0028] The fixing plate 31 is fixed to the upper part of the piston 20. The fixing plate 31 is provided with a pressurizing through hole 311 whose lower part is connected to the upper end of the pressurizing channel 21, and a pressure relief through hole 312 whose lower part is connected to the upper end of the pressure relief channel 22. The upper end of the pressurizing through hole 311, the upper end of the pressure relief through hole 312 and the arc groove 321 match. That is, a detachable fixing plate 31 fixed to the piston 20 is also provided between the lower surface of the rotating plate 32 and the upper end surface of the piston 20, and the matching between the arc groove 321 and the upper end opening of the pressurizing channel 21 and the upper end opening of the pressure relief channel 22 is realized by the pressurizing through hole 311 and the pressure relief through hole 312. In other words, the pressurizing through hole 311 is aligned with and connected to the pressurizing channel 21 and is an extension of the pressurizing channel 21, and the pressure relief through hole 312 is aligned with and connected to the pressure relief channel 22 and is an extension of the pressure relief channel 22. Since both the fixed plate 31 and the rotating plate 32 are preferably made of ceramic material, the convenience of maintenance is further increased, and the two are not prone to wear, which increases the service life of the entire stop valve.

[0029] The vertical line connecting the pressurizing through hole 311 and the rotation axis of the rotating plate 32 and the vertical line connecting the pressure relief through hole 312 and the rotation axis of the rotating plate 32 form an angle α, and the arc groove 321 has an arc β with the rotation axis of the rotating plate 32 as the axis, and α<β. In this way, when the rotating plate 32 rotates to make the pressurizing through hole 311 and the pressure relief through hole 312 change from the cut-off state to the connected state, the connecting process between the pressurizing through hole 311 and the pressure relief through hole 312 is gradual, so that the opening and closing of the valve is more gentle. That is, during the rotation of the rotating plate 32, the following processes occur in sequence: only the downward projection of the pressurizing through hole 311 is located within the downward projection range of the arc groove 321, the entire downward projection of the pressurizing through hole 311 and the downward projection part of the pressure relief through hole 312 are located within the downward projection range of the arc groove 321, the downward projection of the pressurizing through hole 311 and the downward projection of the pressure relief through hole 312 are both located within the downward projection range of the arc groove 321, the downward projection part of the pressurizing through hole 311 and the downward projection of the pressure relief through hole 312 are all located within the downward projection range of the arc groove 321, and only the pressure relief through hole 312 is located within the downward projection range of the arc groove 321, thereby forming a progressive and stable adjustment process.

[0030] Further optimization:

[0031] The upper end of the compression spring 24 cannot rotate relative to the upper part of the valve cavity 13, and the lower end cannot rotate relative to the upper part of the piston 20. For example, the upper end of the compression spring 24 is hooked to the upper part of the valve cavity 13, and the lower end is hooked to the upper part of the piston 20, so that when the pressure is applied, the compression spring 24 also has a force to prevent the piston 20 from rotating, so that when the stop valve is opened and closed, the piston 20 and the valve stem 40 can maintain relative non-rotation to ensure that the switch angle position is constant and the movement is more stable.

[0032] A through hole is provided in the middle of the valve plate 21, and the valve plate is fixed to the lower end surface of the piston 20 by a bolt passing through the through hole from bottom to top. That is, the valve plate 21 is also easy to replace.

[0033] Combination Figure 5-1 to Figure 5-5 As shown, the working principle of the stop valve (for the convenience of explanation, the pressure at the water inlet is represented by P1, the pressure at the water outlet is represented by P2, the pressure at the upper part of the valve cavity is represented by P3, the part of the downward projection of the pressurized channel falling within the downward projection range of the arc groove is represented by △S1, and the part of the downward projection of the pressure relief channel falling within the downward projection range of the arc groove is represented by △S2):

[0034] 1) Close the stop valve. By rotating the rotating plate 32, the pressurizing channel 21 connects the water inlet 11 with the upper part of the valve cavity 13, and the pressure relief channel 22 is closed, so that the pressure in the upper part of the valve cavity 13 increases, and the piston 20 moves downward with the assistance of the downward pressure, so that the stop valve can be closed lightly and conveniently. At this time, P1=P3.

[0035] 2) Open the stop valve. By rotating the rotating plate 32, the pressure relief channel 22 connects the water outlet 12 and the upper part of the valve cavity 13, and the pressurization channel 21 is closed, so that the pressure in the upper part of the valve cavity 13 is reduced. Only a small external force is applied (for example, the valve stem can continue to rotate to pull the piston 20 upward. This structure can adopt a variety of common methods), and the piston 20 can move upward, so that the stop valve can be opened more lightly and conveniently. At this time, P2=P3.

[0036] 3) Progressive adjustment process. In the above process of opening and closing the stop valve, the arc groove 321 will linearly maintain the change of the pressurization channel 21 being open and the pressure relief channel 22 being closed, and the pressure relief channel 22 being open and the pressurization channel 21 being closed, so that the opening and closing of the stop valve are relatively smooth, stable and fast. That is, in the process of rotating the rotating plate 32, there are at least the following changes: a. The pressure relief channel 22 is partially opened, and the pressurization channel 21 is fully connected, △S1 is the maximum value, and △S2 is not the maximum value. b. The pressure relief channel 22 and the pressurization channel 21 are fully connected at the same time, △S1 is the maximum value, and △S2 is the maximum value. c. The pressure relief channel 22 is fully connected and the pressure relief channel 21 is partially connected. At this time, P1>P3>P2. Since P1 is constant, △S1 and △S2 are changing, so P3 and P2 are also changing, causing the piston 20 to be located at different positions. If △S1 and △S2 tend to be constant, the piston 20 will be fixed at a certain position, achieving the effect of automatic and rapid adjustment.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A hydraulic quick-adjusting piston assembly, comprising a piston (20) and a valve plate (23) fixed at the lower portion thereof, characterized in that: The piston (20) is provided with a pressurizing channel (21) and a pressure relief channel (22); the upper ends of the pressurizing channel (21) and the pressure relief channel (22) are both located on the upper surface of the piston (20); the lower end of the pressurizing channel (21) is located on the right side wall of the piston (20); the lower end of the pressure relief channel (22) is located on the lower surface of the piston (20); the valve plate (23) does not block the lower end opening of the pressure relief channel (22); and at the same time, a rotating plate (32) is pivotally connected to the upper part of the piston (20); an arc groove (321) is provided on the lower surface of the rotating plate (32); the arc groove (321) matches the upper ends of the pressurizing channel (21) and the upper ends of the pressure relief channel (22).

2. The hydraulic quick-adjust piston assembly according to claim 1, characterized in that: A fixing plate (31) is fixed to the upper part of the piston (20), and a pressurizing through hole (311) whose lower part is connected to the upper end of the pressurizing channel (21) and a pressure relief through hole (212) whose lower part is connected to the upper end of the pressure relief channel (22) are provided on the fixing plate (31), and the upper end of the pressurizing through hole (311) and the upper end of the pressure relief through hole (212) match the arc groove (321).

3. The hydraulic quick-adjust piston assembly according to claim 2, characterized in that: A through hole is provided in the middle of the valve plate (23), and the valve plate (23) is fixed to the lower end surface of the piston (20) by means of a bolt passing through the through hole from bottom to top.

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