A relief valve for hydraulic motor

Abstract

The present invention discloses a relief valve for a hydraulic motor, characterized in that it comprises a screw plug, a valve sleeve and a cone valve seat, the cone valve seat is matched and connected with the bottom end of the valve sleeve, the other end of the valve sleeve is connected to the screw plug through a second O-ring, a spring seat is arranged inside the screw plug, the outer side of the bottom of the spring seat is connected with the cone valve core inside the valve sleeve through a spring, the other end of the cone valve core is matched and connected with the cone valve seat, the other end of the piston valve core is matched and connected with the cone valve core, the upper end of the piston valve core is provided with a sealing groove, and the lower end is provided with a pressure equalizing groove. The present invention has a simple structure, fewer parts, adopts ridgeline sealing to achieve a stable opening pressure, and is designed with a freely movable pressure buffer part to effectively reduce noise, the guide design and sealing design between the various parts reduce internal leakage, and the key parts are provided with a pressure equalizing groove for lubrication and pressure stabilization, and at the same time has small pressure regulation deviation and small pressure swing, which ensures the working life of the motor and the overall stability of the hydraulic system.

Description

Technical Field

[0001] The invention relates to an overflow valve for a hydraulic motor and belongs to the field of hydraulic valves. Background Art

[0002] The main function of the relief valve used in hydraulic motors is to monitor the internal pressure of the motor when it is working, so that it will never exceed the set pressure of the relief valve, and protect the motor from working under safe pressure. At present, most of the relief valves used in the market adopt multi-stage hole-shaft matching to achieve the effect of secondary overflow. The structure used is relatively complex. In order to reduce the internal leakage, the process requirements of the parts must be relatively strict. On the contrary, if the parts are processed too roughly, it will cause leakage, jamming and other phenomena, which will make it difficult to accurately control the relief pressure of the relief valve, affecting the stability of its performance. At the same time, it will cause many disadvantages such as poor overflow performance when opening and closing, greater impact on itself, and short service life. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to solve the problems of large internal impact, poor overflow effect, unstable overflow pressure and poor opening and closing performance of the overflow valve for hydraulic motor, and to provide a overflow valve structure for hydraulic motor with small impact, stable overflow pressure, good opening and closing performance and simple structure.

[0004] In order to solve the above technical problems, the technical solution of the present invention is to provide a relief valve for a hydraulic motor, which is characterized in that it includes a screw plug, a valve sleeve and a conical valve seat, the conical valve seat is matched and connected with the bottom end of the valve sleeve, the other end of the valve sleeve is connected to the screw plug through a second O-ring, a spring seat is provided inside the screw plug, the outer side of the bottom of the spring seat is connected to the conical valve core inside the valve sleeve through a spring, and the other end of the conical valve core is matched and connected with the conical valve seat; the inner side of the bottom of the spring seat is connected to the piston valve core inside the conical valve core through a third O-ring and multiple second retaining rings, the other end of the piston valve core is matched and connected with the conical valve core, the upper end of the piston valve core is provided with a sealing groove, and the lower end is provided with a pressure equalizing groove.

[0005] Preferably, a fourth chamber is provided inside the spring seat, a movable valve column is provided in the fourth chamber, and the fourth chamber is connected with the third chamber on the piston valve core; a gasket is provided on the outer side of the bottom of the spring seat and is connected to the spring through the gasket.

[0006] Preferably, the upper end of the piston valve core is provided with a third chamber connected to the spring seat, and the lower end is connected to the first chamber inside the cone valve core. A second chamber connected to the third chamber and the first chamber is provided inside the piston valve core. The second chamber is connected to the third chamber through a second throttle hole, and a pressure equalizing groove is provided at the connection between the piston valve core and the first chamber.

[0007] Preferably, the interior of the cone valve core is provided with a first chamber connected to the lower end of the piston valve core, the first chamber is provided with an oil return hole, the oil return hole is connected to the oil inlet inside the cone valve seat through the first throttling hole, the upper end of the cone valve core is connected to the spring, the lower end is matched with the cone valve seat, and a valve sleeve is provided on the outside.

[0008] Preferably, the upper end of the valve sleeve is connected to the screw plug and the spring seat, and a first retaining ring and a first O-ring for sealing are provided on the outside of the valve sleeve.

[0009] Preferably, the valve post is movable in the inner cavity of the spring seat to buffer the pressure.

[0010] Preferably, the piston valve core is movable in the inner cavity of the cone valve core, and is provided with a sealing groove at one end and a pressure equalizing groove at the other end.

[0011] The present invention has a simple structure and fewer parts. It adopts ridge seal to achieve stable opening pressure and is designed with freely movable pressure buffer parts to effectively reduce noise. The guide design and sealing design between the components reduce internal leakage. The key parts are provided with equalizing pressure grooves for lubrication and pressure stabilization. It also has the characteristics of small pressure regulation deviation, small pressure swing, and small influence of motor pressure fluctuation, thereby ensuring the working life of the motor and the overall stability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0014] like Figure 1As shown, a relief valve for a hydraulic motor is characterized in that it includes a screw plug 1, a valve sleeve 13 and a cone valve seat 14, the cone valve seat 14 is matched and connected with the bottom end of the valve sleeve 13, the other end of the valve sleeve 13 is connected to the screw plug 1 through a second O-ring 7, a spring seat 3 is provided inside the screw plug 1, the outer side of the bottom of the spring seat 3 is connected to the cone valve core 12 inside the valve sleeve 13 through a spring 9, and the other end of the cone valve core 12 is matched and connected with the cone valve seat 14; the inner side of the bottom of the spring seat 3 is connected to the piston valve core 4 inside the cone valve core 12 through a third O-ring 5 and a plurality of second retaining rings 6, the other end of the piston valve core 4 is matched and connected with the cone valve core 12, the upper end of the piston valve core 4 is provided with a sealing groove, and the lower end is provided with a pressure equalizing groove. The spring seat 3 is provided with a fourth chamber 23 inside, and a movable valve column 2 is provided inside the fourth chamber 23, and the fourth chamber 23 is connected with the third chamber 22 on the piston valve core 4; a gasket 8 is provided on the outer side of the bottom of the spring seat 3, and is connected with the spring 9 through the gasket 8. The upper end of the piston valve core 4 is provided with a third chamber 22 connected with the spring seat 3, and the lower end is connected with the first chamber 20 inside the cone valve core 12. A second chamber 21 connected with the third chamber 22 and the first chamber 20 is provided inside the piston valve core 4, and the second chamber 21 is connected with the third chamber 22 through the second throttle hole 19. A pressure equalization groove 18 is provided at the connection between the piston valve core 4 and the first chamber 20. The cone valve core 12 is provided with a first chamber 20 connected to the lower end of the piston valve core 4, and the first chamber 20 is provided with an oil return hole 15, and the oil return hole 15 is connected to the oil inlet 16 inside the cone valve seat 14 through the first throttle hole 17. The upper end of the cone valve core 12 is connected to the spring 9, and the lower end is matched with the cone valve seat 14, and the outside is provided with a valve sleeve 13. The upper end of the valve sleeve 13 is connected to the screw plug 1 and the spring seat 3, and the outside of the valve sleeve 13 is provided with a first retaining ring 11 and a first O-ring 10 for sealing.

[0015] like Figure 1 The figure is a schematic diagram of the structure of a relief valve for a hydraulic motor. The cone valve core 12 and the cone valve seat 14 have a cone surface contact at the inner cavity end surface. The first chamber 20 of the cone valve core 12 is tightly matched with the piston valve core 4. The piston valve core 4 is provided with a pressure equalizing groove 18 in the first chamber 20. The first chamber 20 is connected with the second chamber 21. The other end of the piston valve core 4 is matched with the spring seat 3. The matching part of the piston valve core 4 is provided with a groove for assembling the third O-ring 5 and the second retaining ring 6. The second chamber 21 and the third chamber 22 at both ends of the piston valve core 4 are connected by the second throttling The holes 19 are interlinked, the fourth chamber 23 of the spring seat 3 is precisely matched with the valve column 2, and the fourth chamber 23 is connected with the third chamber 22, the other end of the spring seat 3 is connected with the gasket 8, the gasket 8 is connected with the cone valve core 12 through the spring 9, the outer side of the cone valve seat 14 is matched with one end of the valve sleeve 13, the outer side of the valve sleeve 13 is provided with a groove for assembling the first O-ring 10 and the first retaining ring 11, the other end of the valve sleeve 13 is threadedly connected with the screw plug 1, and a second O-ring 7 is provided at the connection for sealing.

[0016] In this embodiment, the valve rod 2 has a movement space in the fourth chamber 23 of the spring seat 3. The piston valve core 4 also has a movement space in the first chamber 20 of the cone valve core 12.

[0017] When in use, the spring 9 separates the oil inlet 16 from the oil return port 15. When the hydraulic oil at the oil inlet 16 enters the cone valve seat 14, it enters the first chamber 20 of the cone valve core 12 through the first throttle hole 17 and pushes the piston valve core 4 to move. Since the piston valve core 4 and the cone valve core 12 are matched, the pressure oil in the first chamber 20 will flow into the pressure equalizing groove 18 to protect and lubricate the piston valve core 4. The oil enters the second chamber 21 through the first chamber 20, and then flows into the third chamber 22 through the second throttle hole 19. The hydraulic oil in the third chamber 22 flows into the fourth After the chamber 23 is opened, the valve column 2 is pushed to move. The piston valve core 4 and the valve column 2 play a role in relieving the pressure shock during the movement. When the hydraulic oil pressure at the oil inlet 16 gradually rises, the load of the spring 9 slowly increases. When the set pressure of the spring 9 is broken, the cone valve core 12 will move slowly, so that the cone valve core 12 and the cone valve seat 14 are separated and the seal is released, so that the high-pressure oil at the oil inlet 16 is quickly and smoothly leaked to the oil return hole 15, ensuring that the pressure at the oil inlet 16 is always within the pressure regulating range of the relief valve, thereby protecting the system.

Claims

1. A relief valve for a hydraulic motor, characterized in that: The invention comprises a screw plug (1), a valve sleeve (13) and a cone valve seat (14), wherein the cone valve seat (14) is matched and connected with the bottom end of the valve sleeve (13), and the other end of the valve sleeve (13) is connected with the screw plug (1) via a second O-ring (7). A spring seat (3) is provided inside the screw plug (1), and the outer side of the bottom of the spring seat (3) is connected with the cone valve core (12) inside the valve sleeve (13) via a spring (9), and the other end of the cone valve core (12) is matched and connected with the cone valve seat (14); the spring The inner side of the bottom of the seat (3) is connected to the piston valve core (4) inside the cone valve core (12) through a third O-ring (5) and a plurality of second retaining rings (6); the other end of the piston valve core (4) is matched and connected to the cone valve core (12); the upper end of the piston valve core (4) is provided with a sealing groove, and the lower end is provided with a pressure equalizing groove (18); the interior of the cone valve core (12) is provided with a first chamber (20) connected to the lower end of the piston valve core (4); the first chamber (20) is provided with an oil return hole (15), and the return oil hole (15) is provided on the first chamber (20). The oil hole (15) is connected to the oil inlet (16) inside the cone valve seat (14) through the first throttle hole (17); the upper end of the cone valve core (12) is connected to the spring (9), and the lower end matches the cone valve seat (14); the valve sleeve (13) is arranged outside the cone valve core (12); the upper end of the piston valve core (4) is provided with a third chamber (22) connected to the spring seat (3), and the lower end is connected to the first chamber (20) inside the cone valve core (12); A second chamber (21) is provided which is connected to the third chamber (22) and the first chamber (20); the second chamber (21) and the third chamber (22) are connected via a second throttle hole (19); a pressure equalizing groove (18) is provided at the connection between the piston valve core (4) and the first chamber (20); a fourth chamber (23) is provided inside the spring seat (3); a movable valve column (2) is provided in the fourth chamber (23); and the fourth chamber (23) is connected to the third chamber (22) on the piston valve core (4).

2. A relief valve for a hydraulic motor as claimed in claim 1, characterized in that: A gasket (8) is provided on the outer side of the bottom of the spring seat (3), and is connected to the spring (9) via the gasket (8).

3. A relief valve for a hydraulic motor as claimed in claim 1, characterized in that: The upper end of the valve sleeve (13) is connected to the screw plug (1) and the spring seat (3), and a first retaining ring (11) and a first O-ring (10) for sealing are provided on the outside of the valve sleeve (13).

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