A hydraulic control valve

Abstract

The present invention discloses a hydraulic control valve, which comprises a valve body, a valve seat, a valve cover, a valve flap, a hydraulic cylinder, a piston and a push rod. The valve body includes an inlet chamber and an outlet chamber. A through hole is provided on the valve cover, and a hydraulic cylinder is provided on the top of the valve cover. A piston is arranged in the hydraulic cylinder, and the piston divides the hydraulic cylinder into a lower chamber and an upper chamber. The lower chamber is communicated with the inlet chamber through pipeline one, and the upper chamber is communicated with the outlet chamber through pipeline two. An end stroke buffer device is arranged in the inlet chamber. When the pressure in the inlet chamber suddenly drops and the medium in the pipeline generates backflow, the medium in the outlet chamber enters the upper chamber through pipeline two. The pressure in the upper chamber gradually rises, the piston moves downward, and the valve flap slowly closes. This valve is installed in the pipeline, mainly to control the backflow of the medium, and at the same time eliminate the destructive water hammer generated by the sudden backflow of the medium. In addition, each time the valve flap opens and closes a movement cycle, the valve flap rotates to a set angle, which can improve the service life of the gasket.

Description

Technical Field

[0001] The present invention relates to a hydraulic control valve. Background Art

[0002] Hydraulic control valves are a general term for a series of multi-purpose control and safety valves. Hydraulic control valves can achieve control of pressure, flow rate, liquid level, etc. only by relying on the energy of the flowing medium. According to different design requirements and usage requirements in the water supply system, dozens of valves with different uses can be evolved, and often used ones include pilot-operated pressure reducing valves, pressure relief and safety valves, remote control float valves, etc. Briefly speaking, a hydraulic control valve is composed of a main valve and different pilot valve systems. By assembling different pilot valve systems, the hydraulic control valve can have different usage functions.

[0003] The main valve mostly adopts a piston-type valve flap, and a gasket is arranged between the valve flap and the valve seat. The gasket at the extrusion part between the valve flap and the valve seat is prone to aging under repeated high pressure, thus affecting the overall sealing performance of the main valve. In addition, if the closing speed of the main valve is too fast, a water hammer phenomenon will occur. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic control valve to eliminate the destructive water hammer caused by sudden reverse flow of the medium and at the same time extend the service life of the gasket.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A hydraulic control valve includes a valve body, a valve seat, a valve cover, a valve flap, a hydraulic cylinder, a piston, and a push rod. The valve body includes an inlet cavity and an outlet cavity. A valve seat is arranged at the connection of the inlet cavity and the outlet cavity. A valve cover is arranged at the top of the outlet cavity. A through hole is arranged on the valve cover. The push rod passes through the through hole of the valve cover and is slidably and sealingly connected to the valve cover. A hydraulic cylinder is arranged on the top of the valve cover. A piston is arranged in the hydraulic cylinder. The piston divides the hydraulic cylinder into a lower chamber and an upper chamber. The lower chamber is communicated with the inlet cavity through a pipeline one, and the upper chamber is communicated with the outlet cavity through a pipeline two. The piston is connected to the push rod, and the other end of the push rod is connected to the valve flap. A spring is arranged between the valve flap and the valve cover.

[0007] When the pressure in the inlet cavity suddenly decreases and the medium in the pipeline generates reverse flow, the medium in the outlet cavity enters the upper chamber through the pipeline two. The pressure in the upper chamber gradually rises, the piston moves downward, and the valve flap slowly closes. This valve is installed in the pipeline, mainly controlling the reverse flow of the medium and at the same time eliminating the destructive water hammer caused by sudden reverse flow of the medium.

[0008] In order to further eliminate the destructive water hammer caused by sudden reverse flow of the medium, an end stroke buffer device is arranged in the inlet cavity for the push rod.

[0009] When the valve flap has a remaining opening of ten percent, the push rod triggers the end - stroke buffer device, and the movement speed of the valve flap further slows down, slowly closing the remaining ten percent of the opening. The end - stroke buffer device can better prevent the water hammer generated by the reverse flow of the medium.

[0010] Furthermore, in order to avoid frequent compression and aging deformation of the gasket under the valve flap, the valve flap is movably connected to the push rod. There is a hole in the center of the valve flap, and the valve flap is sleeved on the push rod and can rotate around the center. Correspondingly, the valve seat is a valve disc, and flow - through holes are evenly distributed on the valve disc.

[0011] A rotating drive ring is arranged on the periphery of the valve flap. A plurality of longitudinal guide grooves are circumferentially distributed at equal intervals on the outer wall of the rotating drive ring. Adjacent two longitudinal guide grooves are connected by an inclined guide groove. The longitudinal guide grooves and the inclined guide grooves are connected end - to - end around the rotating drive ring for one week. A spring piece is arranged outside the rotating drive ring. The lower end of the spring piece is fixed on the valve seat. A guide pin is arranged at the upper end of the spring piece, and the guide pin is placed in the longitudinal guide groove or the inclined guide groove. At the intersection of the longitudinal guide groove and the inclined guide groove above, the depth of the inclined guide groove is greater than the depth of the longitudinal guide groove. At the intersection of the longitudinal guide groove and the inclined guide groove below, the depth of the longitudinal guide groove is greater than the depth of the inclined guide groove. The depths of the longitudinal guide groove and the inclined guide groove change gradually. The depth of the initial position of each guide groove is greater than the depth of its own termination position. The depth of the initial position of each guide groove is greater than the depth of the termination position of the adjacent guide groove in front. The depth of the termination position of each guide groove is less than the depth of the initial position of the adjacent guide groove behind.

[0012] During the opening and closing process of the valve flap, it moves relative to the valve seat. During the movement, the guide pin is always in the guide groove of the rotating drive ring. Since the depths of the adjacent guide grooves are different at the intersection, a downward step will be formed, that is, the guide pin will jump down the step and travel along the adjacent next guide groove during the return stroke. Each time the valve flap opens and closes for a movement cycle, the valve flap rotates to a set angle, which can further improve the service life of the gasket.

[0013] The beneficial effects of the present invention are as follows:

[0014] When the pressure in the inlet cavity suddenly decreases and the medium in the pipeline generates reverse flow, the medium in the outlet cavity enters the upper chamber through pipeline two. The pressure in the upper chamber gradually rises, the piston moves downward, and the valve flap slowly closes. This valve is installed in the pipeline, mainly controlling the reverse flow of the medium and simultaneously eliminating the destructive water hammer generated by the sudden reverse flow of the medium. In addition, each time the valve flap opens and closes for a movement cycle, the valve flap rotates to a set angle, which can improve the service life of the gasket. Brief Description of the Drawings

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] Figure 1 This is a structural schematic diagram of the present invention.

[0017] Figure 2 is Figure 1 a partially enlarged view of

[0018] Figure 3 This is a diagram showing the fully open state of the main valve of the present invention.

[0019] Figure 4 This is a diagram showing the fully closed state of the main valve of the present invention.

[0020] Figure 5 This is a structural schematic diagram of the valve seat in the present invention.

[0021] Figure 6 This is a structural schematic diagram of the rotating ring in the present invention.

[0022] In the figure: 1 - valve body; 101 - inlet chamber; 102 - outlet chamber; 2 - valve seat; 201 - valve disc; 202 - flow-through hole; 203 - boss; 3 - valve cover; 4 - hydraulic cylinder; 401 - lower chamber; 402 - upper chamber; 5 - piston; 601 - pipeline 1; 602 - pipeline 2; 7 - push rod; 8 - valve flap; 9 - spring; 10 - limit ejector pin; 11 - buffer cup; 111 - overflow hole; 12 - rotating ring; 121 - longitudinal guiding groove; 122 - oblique guiding groove; 13 - elastic piece; 131 - guiding pin. Specific embodiments

[0023] As Figure 1 shown, a hydraulic control valve includes a valve body 1, a valve seat 2, a valve cover 3, a valve flap 8, a hydraulic cylinder 4, a piston 5, and a push rod 7. The valve body 1 includes an inlet chamber 101 and an outlet chamber 102. A valve seat 2 is provided at the connection of the inlet chamber 101 and the outlet chamber 102. A valve cover 3 is provided at the top of the outlet chamber 102. A through hole is provided on the valve cover 3, and the push rod 7 passes through the through hole of the valve cover 3 and is slidably and sealingly connected relative to the valve cover 3. A hydraulic cylinder 4 is provided on the top of the valve cover 3. A piston 5 is provided inside the hydraulic cylinder 4. The piston 5 divides the hydraulic cylinder into a lower chamber 401 and an upper chamber 402. The lower chamber 401 is communicated with the inlet chamber 101 through pipeline 1 601, and the upper chamber 402 is communicated with the outlet chamber 102 through pipeline 2 602. The piston 5 is connected to the push rod 7, and the other end of the push rod 7 is connected to the valve flap 8. A spring 9 is provided between the valve flap 8 and the valve cover 3.

[0024] When the pressure in the inlet chamber 101 suddenly drops and the medium in the pipeline generates a reverse flow, the medium in the outlet chamber 102 enters the upper chamber 402 through the pipeline two 602. The pressure in the upper chamber 402 gradually rises, the piston 5 moves downward, and the valve flap 8 slowly closes. This valve is installed in the pipeline, mainly controlling the reverse flow of the medium and eliminating the destructive water hammer generated by the sudden reverse flow of the medium at the same time.

[0025] In order to be able to control the flow rate and the outlet pressure, an adjustable limit ejector pin 10 is provided on the hydraulic cylinder 4. The limit ejector pin 10 can limit the maximum opening amount of the valve flap 8, so as to achieve the purpose of controlling the flow rate and the outlet pressure.

[0026] In order to further eliminate the destructive water hammer generated by the sudden reverse flow of the medium, a terminal stroke buffer device is provided for the push rod 7 in the inlet chamber 101. As Figure 3 shown, when the valve flap 8 has a remaining opening of ten percent, the push rod 7 triggers the terminal stroke buffer device, and the movement speed of the valve flap 8 further slows down, slowly closing the remaining ten percent of the opening. The state after complete closing is as Figure 4 shown. The terminal stroke buffer device can better prevent the water hammer generated by the reverse flow of the medium.

[0027] Preferably, as Figure 2 shown, the terminal stroke buffer device is a buffer cup 11. The buffer cup 11 is fixedly arranged at the forming end of the push rod 7. The diameter of the cup mouth is larger than the diameter of the end of the push rod 7. An overflow hole 111 is provided at the bottom of the buffer cup 11. When the medium flows normally, the medium will fill the buffer cup 11. When the valve flap 8 closes, the push rod 7 is inserted into the buffer cup 11, and the medium filled in the buffer cup 11 sprays out from the side wall and the flow holes 111 at the bottom, using the medium itself for buffering. The structure is simple, and there is no contact and no friction between the push rod 7 and the buffer cup 11, which can reduce the failure rate on the premise of ensuring the buffering effect.

[0028] Further, in order to prevent the sealing gasket under the valve flap 8 from being frequently compressed and aging and deforming, the valve flap 8 is movably connected to the push rod 7. There is a hole in the center of the valve flap 8. The valve flap 8 is sleeved on the push rod 7 and can rotate around the center. Correspondingly, the valve seat 2 is a valve disc 201, and flow holes 202 are uniformly arranged on the valve disc 201. When the valve flap 8 is in the open state, it has a degree of rotational freedom. Under the action of the medium, the valve flap 8 will rotate randomly, that is, each time the contact part between the sealing gasket under the valve flap 8 and the flow hole 202 of the valve seat 2 changes randomly, so as to extend the service life of the sealing gasket.

[0029] Preferably, as Figure 5 shown, a convex platform 203 is provided at the edge of the flow hole 202, which can improve the sealing degree.

[0030] Furthermore, in order to enable the valve flap 8 to rotate to a set angle in each opening - to - closing movement cycle instead of randomly, the specific solution adopted is as follows: A rotary drive ring 12 is arranged around the valve flap 8. As shown in Figures 1 to 4 Figures 5 and 6, a plurality of longitudinal guide grooves 121 are arranged at equal intervals in the circumferential direction on the outer wall of the rotary drive ring 12. Adjacent two longitudinal guide grooves 121 are connected by an inclined guide groove 122. The longitudinal guide grooves 121 and the inclined guide groove 122 are connected end - to - end to surround the rotary drive ring 12 for one week. A spring piece 13 is arranged outside the rotary drive ring 12. The lower end of the spring piece 13 is fixed on the valve seat 2. A guide pin 131 is arranged at the upper end of the spring piece 13. The guide pin 131 is placed in the longitudinal guide groove 121 or the inclined guide groove 122. At the intersection of the longitudinal guide groove 121 and the inclined guide groove 122 above, the depth of the inclined guide groove 122 is greater than the depth of the longitudinal guide groove 121, so a step will be formed. When the guide pin 131 moves upward to the end along the longitudinal guide groove 121, it will fall into the deeper inclined guide groove 122. Correspondingly, at the intersection of the longitudinal guide groove 121 and the inclined guide groove 122 below, the depth of the longitudinal guide groove 121 is greater than the depth of the inclined guide groove 122. When the guide pin 131 moves obliquely downward to the end along the inclined guide groove 122, it will fall into the deeper longitudinal guide groove 121. Repeating the above cycle, the depths of the longitudinal guide groove 121 and the inclined guide groove 122 change gradually. The depth of the initial position of each guide groove is greater than the depth of its own end position. The depth of the initial position of each guide groove is greater than the depth of the end position of the adjacent guide groove in front. The depth of the end position of each guide groove is less than the depth of the initial position of the adjacent guide groove behind.

[0031] The working principle of the rotary drive ring 12 driving the valve flap 8 to rotate is as follows: The valve flap 8 moves relative to the valve seat 2 during the opening and closing process. During the movement, the guide pin 131 is always in the guide groove of the rotary drive ring 12. Since the depths of adjacent guide grooves are different at the intersection, a downward step will be formed, that is, the guide pin 131 will jump down the step and travel along the adjacent next guide groove during the return journey. The final effect is that during the closing process of the valve flap 8, the guide pin 131 is in the longitudinal guide groove 121 and the rotary drive ring 12 does not rotate; during the opening process of the valve flap 8, the guide pin 131 is in the inclined guide groove 122 and the rotary drive ring 12 rotates by a certain angle.

[0032] The valve flap 8 rotates to a set angle in each opening - to - closing movement cycle, which can further improve the service life of the gasket.

[0033] The above - disclosed are only specific embodiments of this patent, but this patent is not limited thereto. For those of ordinary skill in the art, without departing from the principle of the present invention, the deformations made should be regarded as belonging to the protection scope of the present invention.

Claims

1. A hydraulic control valve, comprising a valve body (1), a valve seat (2), a valve cover (3) and a valve flap (8), characterized in that: It further includes a hydraulic cylinder (4), a piston (5), and a push rod (7). The valve body (1) includes an inlet chamber (101) and an outlet chamber (102). A valve seat (2) is provided at the connection of the inlet chamber (101) and the outlet chamber (102). A valve cover (3) is provided at the top of the outlet chamber (102). A through hole is provided on the valve cover (3). The push rod (7) passes through the through hole of the valve cover (3) and is slidably and sealingly connected relative to the valve cover (3). A hydraulic cylinder (4) is provided on the top of the valve cover (3). A piston (5) is provided inside the hydraulic cylinder (4). The piston (5) divides the hydraulic cylinder into a lower chamber (401) and an upper chamber (402). The lower chamber (401) is communicated with the inlet chamber (101) through a first pipeline (601). The upper chamber (402) is communicated with the outlet chamber (102) through a second pipeline (602). The piston (5) is connected to the push rod (7). The other end of the push rod (7) is connected to a valve flap (8). A spring (9) is provided between the valve flap (8) and the valve cover (3). The valve flap (8) is movably connected to the push rod (7). A hole is provided at the center of the valve flap (8). The valve flap (8) is sleeved on the push rod (7) and can rotate around the center. The valve seat (2) is a valve disc (201), and flow holes (202) are evenly distributed on the valve disc (201). A boss (203) is provided at the edge of the flow hole (202). A rotary drive ring (12) is provided on the periphery of the valve flap (8). A plurality of longitudinal guide grooves (121) are circumferentially distributed at equal intervals on the outer wall of the rotary drive ring (12). Adjacent two longitudinal guide grooves (121) are connected by an inclined guide groove (122). The longitudinal guide grooves (121) and the inclined guide grooves (122) are connected end to end to surround the rotary drive ring (12) for one week. A spring piece (13) is provided on the periphery of the rotary drive ring (12). The lower end of the spring piece (13) is fixed on the valve seat (2). A guide pin (131) is provided at the upper end of the spring piece (13). The guide pin (131) is placed in the longitudinal guide groove (121) or the inclined guide groove (122). At the intersection of the longitudinal guide groove (121) and the inclined guide groove (122) above, the depth of the inclined guide groove (122) is greater than the depth of the longitudinal guide groove (121), forming a step. At the intersection of the longitudinal guide groove (121) and the inclined guide groove (122) below, the depth of the longitudinal guide groove (121) is greater than the depth of the inclined guide groove (122). The depths of the longitudinal guide groove (121) and the inclined guide groove (122) change in a transitional manner. The depth of the initial position of each guide groove is greater than the depth of its own termination position. The depth of the initial position of each guide groove is greater than the depth of the termination position of the adjacent guide groove in front. The depth of the termination position of each guide groove is less than the depth of the initial position of the adjacent guide groove behind.

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