Driving mechanism of piston type hydraulic control valve

Abstract

A driving mechanism of a piston type hydraulic control valve comprises a driving support, a barrel is arranged on the upper side of the driving support, a driving support protruding ring is connected to the upper side of the driving support, and the driving support protruding ring is arranged in the barrel. The outer circumferential face of the driving support protruding ring makes contact with the inner circumferential face of the lower end of the barrel, a driving support sealing ring is arranged between the driving support protruding ring and the barrel, a piston is arranged in the barrel, an end cover is arranged at the upper end of the barrel, an end cover protruding ring is arranged on the lower side of the end cover, and the end cover protruding ring is arranged in the barrel. The outer circumferential face of the end cover protruding ring makes contact with the inner circumferential face of the upper end of the barrel, and an end cover sealing ring is arranged between the end cover protruding ring and the barrel. Due to the fact that the sealing faces of the cylinder, the end cover and the driving support are the inner circumferential faces of the cylinder, when the cylinder is machined, only the inner hole of the cylinder needs to be subjected to finish machining, the outer circle of the cylinder does not need to be machined, the machining amount of the cylinder is reduced, energy is saved, consumption is reduced, only one-time clamping is needed, the procedure is simple, and production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the mechanical field, in particular to a valve structure, in particular to a driving mechanism of a piston type hydraulic control valve. Background Art

[0002] The hydraulic control valve is composed of a main valve, a pilot valve, a needle valve and a conduit component. The medium's own pressure is used to automatically control the opening, adjustment and closing of the valve through conduits and pilot valves of different structures. The liquid level pressure, flow rate and direction of the water supply system are automatically controlled. It is widely used in water supply systems such as production, life and fire protection. When DN≧500mm, the driving part of the main valve is a piston structure. In the prior art, the end cover of the piston drive mechanism is sleeved on the outer circle of the upper end of the cylinder, and the drive bracket is sleeved on the outer circle of the lower end of the cylinder. The piston slides in the cylinder, and the sealing surface of the cylinder and the piston is on the inner circle of the cylinder, while the sealing surface of the cylinder and the end cover and the drive bracket is on the outer circle. Therefore, the inner circle and the outer circle of the cylinder need to be precisely processed, the production process is more, the production efficiency is low, and such a processing process cannot be clamped once, and the second clamping will cause errors. In addition, the resistance between the piston and the cylinder is large, the piston movement is not stable enough, and it is easy to get stuck, resulting in damage to the piston seal. Summary of the invention

[0003] The utility model aims to provide a driving mechanism for a piston type hydraulic control valve, which is intended to solve the technical problems in the prior art of having more cylinder production processes, lower production efficiency, and insufficient piston movement stability leading to wear of the sealing ring.

[0004] The utility model discloses a driving mechanism of a piston type hydraulic control valve, comprising a driving bracket, a cylinder body is arranged on the upper side of the driving bracket, a driving bracket convex ring is connected to the upper side of the driving bracket, the driving bracket convex ring is arranged in the cylinder body, the outer circumferential surface of the driving bracket convex ring contacts the inner circumferential surface of the lower end of the cylinder body, and a driving bracket sealing ring is arranged between the driving bracket convex ring and the cylinder body, a driving bracket sealing groove is arranged on the outer circumferential surface of the driving bracket convex ring, the driving bracket sealing ring is located in the driving bracket sealing groove, a piston is arranged in the cylinder body, the outer circumferential surface of the piston contacts the inner circumferential surface of the cylinder body, and two piston sealing rings and a piston are arranged between the piston and the cylinder body. A wear-resistant guide ring is arranged between two piston sealing rings. Two piston sealing grooves and a guide ring mounting groove are arranged on the outer circumferential surface of the piston. The two piston sealing rings are respectively located in the two piston sealing grooves. The wear-resistant guide ring is located in the guide ring mounting groove. A piston rod is passed through the piston. A piston rod sealing ring is arranged between the piston rod and the piston. The lower end of the piston rod passes through the driving bracket. An end cover is arranged at the upper end of the cylinder. An end cover convex ring is arranged on the lower side of the end cover. The end cover convex ring is arranged in the cylinder. The outer circumferential surface of the end cover convex ring contacts with the inner circumferential surface of the upper end of the cylinder and an end cover sealing ring is arranged between the end cover convex ring and the cylinder.

[0005] Furthermore, the cylinder is made of a seamless steel pipe.

[0006] Compared with the prior art, the utility model has a positive and obvious effect. Since the sealing surfaces of the cylinder body, the end cover and the driving bracket are all the inner circumferential surface of the cylinder body, when processing the cylinder body, it is only necessary to fine-process the inner hole of the cylinder body, and there is no need to process the outer circumference of the cylinder body, which reduces the processing amount of the cylinder body, saves energy and reduces consumption, only requires one clamping, and the process is simple, which greatly improves production efficiency. Two piston sealing rings are arranged between the piston and the cylinder body, and a wear-resistant guide ring is added between the two piston sealing rings. The wear-resistant guide ring has the characteristics of wear resistance and low friction resistance, which better maintains the stability of the piston movement, enhances the service life of the piston sealing ring, solves the problem of easy damage and wear resistance of the piston sealing ring, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The utility model is a schematic diagram of a driving mechanism of a piston type hydraulic control valve.

[0008] Figure 2 for Figure 1 A is a partial enlarged schematic diagram of .

[0009] Figure 3 for Figure 1 B is a partial enlarged schematic diagram. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of description and is not a limitation on the technical solution of the present invention.

[0011] like Figure 1-Figure 3As shown, a driving mechanism of a piston type hydraulic control valve of the utility model comprises a driving bracket 8, a cylinder 3 is arranged on the upper side of the driving bracket 8, a driving bracket convex ring 7 is connected to the upper side of the driving bracket 8, the driving bracket convex ring 7 is arranged in the cylinder 3, the outer circumferential surface of the driving bracket convex ring 7 is in contact with the inner circumferential surface of the lower end of the cylinder 3, and a driving bracket sealing ring 9 is arranged between the driving bracket convex ring 7 and the cylinder 3, a driving bracket sealing groove is arranged on the outer circumferential surface of the driving bracket convex ring 7, the driving bracket sealing ring 9 is located in the driving bracket sealing groove, a piston 4 is arranged in the cylinder 3, the outer circumferential surface of the piston 4 is in contact with the inner circumferential surface of the cylinder 3, and two piston sealing rings 6 and a wear-resistant piston sealing ring 9 are arranged between the piston 4 and the cylinder 3. Guide ring 5, wear-resistant guide ring 5 is arranged between two piston sealing rings 6, two piston sealing grooves and a guide ring mounting groove are arranged on the outer circumferential surface of piston 4, two piston sealing rings 6 are respectively located in the two piston sealing grooves, wear-resistant guide ring 5 is located in the guide ring mounting groove, a piston rod 12 is passed through the piston 4, a piston rod sealing ring is arranged between the piston rod 12 and the piston 4, the lower end of the piston rod 12 passes through the driving bracket 8, an end cover 1 is arranged at the upper end of the cylinder 3, an end cover convex ring 10 is arranged on the lower side of the end cover 1, the end cover convex ring 10 is arranged in the cylinder 3, the outer circumferential surface of the end cover convex ring 10 is in contact with the inner circumferential surface of the upper end of the cylinder 3 and an end cover sealing ring 2 is arranged between the end cover convex ring 10 and the cylinder 3.

[0012] Furthermore, the cylinder 3 is made of a seamless steel pipe.

[0013] Specifically, the drive bracket 8, wear-resistant guide ring 5, piston 4, piston rod 12, seamless steel pipe, etc. in this embodiment all adopt well-known solutions in the prior art, which are well understood by those skilled in the art and will not be described in detail here.

[0014] The working principle of this embodiment:

[0015] Since the sealing surfaces of the cylinder 3, the end cover 1 and the driving bracket 8 are all the inner circumferential surfaces of the cylinder 3, when processing the cylinder 3, only the inner hole of the cylinder 3 needs to be fine-machined, and there is no need to machine the outer circle of the cylinder 3, which reduces the processing amount of the cylinder 3, saves energy and reduces consumption, only requires one clamping, the process is simple, and the production efficiency is greatly improved.

[0016] Two piston sealing rings 6 are arranged between the piston 4 and the cylinder 3, and a wear-resistant guide ring 5 is added between the two piston sealing rings 6. The wear-resistant guide ring 5 has the characteristics of wear resistance and small friction resistance, which better maintains the stability of the movement of the piston 4, enhances the service life of the piston sealing ring 6, solves the problem of easy damage and wear resistance of the piston sealing ring 6, and saves costs.

[0017] The cylinder body 3 is cut from a seamless steel pipe with high smoothness, which reduces the movement resistance of the piston 4.

Claims

1. A driving mechanism for a piston-type hydraulic control valve, comprising a driving bracket, characterized in that: A cylinder is arranged on the upper side of the driving bracket, a driving bracket convex ring is connected to the upper side of the driving bracket, the driving bracket convex ring is arranged in the cylinder, the outer circumferential surface of the driving bracket convex ring contacts the inner circumferential surface of the lower end of the cylinder, and a driving bracket sealing ring is arranged between the driving bracket convex ring and the cylinder, a driving bracket sealing groove is arranged on the outer circumferential surface of the driving bracket convex ring, the driving bracket sealing ring is located in the driving bracket sealing groove, a piston is arranged in the cylinder, the outer circumferential surface of the piston contacts the inner circumferential surface of the cylinder, and two piston sealing rings and a wear-resistant guide ring are arranged between the piston and the cylinder, and the wear-resistant guide ring is arranged Between the two piston sealing rings, two piston sealing grooves and a guide ring mounting groove are arranged on the outer circumferential surface of the piston, the two piston sealing rings are respectively located in the two piston sealing grooves, the wear-resistant guide ring is located in the guide ring mounting groove, a piston rod is passed through the piston, a piston rod sealing ring is arranged between the piston rod and the piston, the lower end of the piston rod passes through the driving bracket, an end cover is arranged at the upper end of the cylinder, an end cover convex ring is arranged on the lower side of the end cover, the end cover convex ring is arranged in the cylinder, the outer circumferential surface of the end cover convex ring is in contact with the inner circumferential surface of the upper end of the cylinder, and an end cover sealing ring is arranged between the end cover convex ring and the cylinder.

2. The driving mechanism of a piston type hydraulic control valve according to claim 1, characterized in that: The cylinder is made of a seamless steel pipe.

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