Direct-acting type oil supplementing overflow valve

Abstract

The utility model discloses a direct-acting type oil supplementing overflow valve which comprises an overflow valve body and a valve body, the whole overflow valve body is arranged in the valve body, the overflow valve body comprises a valve element, a valve seat and a pressure adjusting screw are arranged on the valve element, a pressure adjusting spring is arranged between the valve seat and the pressure adjusting screw, a gasket and an elastic check ring for a hole are arranged at the right end in the valve body, and the valve element is arranged in the valve body. A conical spring is arranged between the pressure adjusting screw and the gasket. The overflow valve as a whole forms the one-way oil supplementing valve together with the valve body, the conical spring, the gasket, the O-shaped ring and the circlip for the hole, when the pressure of the P port is reduced to zero and reverse air suction is generated, under the action of atmospheric pressure, the overflow valve is pushed away as a whole to compress the conical spring to realize reverse oil supplementing from the T port to the P port, and the air suction phenomenon of a hydraulic system can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow valves, in particular to a direct-acting oil-supplying overflow valve. Background Art

[0002] Common direct-acting relief valves in China include: Figure 3 As shown in the figure, it mainly consists of a pressure regulating screw rod 1, a locking nut 2, a valve body 3, a pressure regulating spring 4, a spring seat 5, a pressure regulating valve core 6 and an O-ring. Figure 4 As shown, the direct-acting relief valve can only overflow from port P to port T in one direction, which can protect the hydraulic system. It cannot be opened in the reverse direction, so it does not have the oil replenishment function and is not suitable for situations where reverse oil replenishment is required in the fan motor hydraulic system. Summary of the invention

[0003] The utility model aims to solve the above-mentioned technical problems and provides a direct-acting oil-filling overflow valve, which is mainly used in the control system of the hydraulic fan motor of engineering machinery. On the one hand, it protects the hydraulic system by overflow, and on the other hand, it can reversely replenish oil to avoid the problem of air suction when the motor rotates by inertia.

[0004] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is: a direct-acting oil-making overflow valve, characterized in that it includes an overflow valve and a valve body, the overflow valve is arranged as a whole in the valve body, the overflow valve includes a valve core, a valve seat and a pressure-adjusting screw are arranged on the valve core, a pressure-adjusting spring is arranged between the valve seat and the pressure-adjusting screw, a gasket and an elastic retaining ring for a hole are arranged at the right end of the valve body, and a conical spring is arranged between the pressure-adjusting screw and the gasket.

[0005] Preferably, the cross section of the pressure regulating screw is set to be a cross shape, and the outer edge of the pressure regulating screw is set to be a spherical surface.

[0006] Preferably, the valve seat and the valve body, and the valve seat and the valve core are both sealed with conical surfaces.

[0007] Working principle: When the pressure at port P rises to a certain set value, the valve core overcomes the spring force and moves to the left to open between the valve seat to achieve overflow, which can play an overload protection role; when the pressure at port P drops to zero and reverse suction occurs, under the action of atmospheric pressure, the relief valve moves to the right as a whole to compress the cone spring and the inner hole of the valve body to open, and the hydraulic oil flows from port T to port P to achieve the reverse oil replenishment of the system, which can effectively avoid the suction of the hydraulic system. In order to ensure a better oil replenishment effect, the stiffness of the cone spring is generally designed to be smaller, so that the oil replenishment opening pressure from port T to port P is <0.1MPa, that is, less than 1 atmospheric pressure to obtain a better oil replenishment effect.

[0008] Compared with the traditional structure, the utility model has the following beneficial effects: the structural design is reasonable, and it is composed of a relief valve and a one-way oil replenishing valve. The valve seat, the pressure regulating spring, the valve core, and the pressure regulating screw are assembled together to form a direct-acting relief valve. The required P→T relief pressure can be obtained by adjusting the pressure regulating screw. After the required relief pressure is obtained, the pressure regulating screw and the valve core are spot welded together to prevent pressure drop during use; the relief valve is installed in the valve body as a whole, and is stabilized by a conical spring, a gasket, and an elastic retaining ring for the hole. In the hydraulic system, it can not only play an overload protection role, but also can achieve better reverse oil replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the utility model;

[0010] Figure 2 This is the hydraulic principle diagram of the utility model;

[0011] Figure 3 This is a structural diagram of a common direct-acting relief valve in China;

[0012] Figure 4 This is the hydraulic principle diagram of a common direct-acting relief valve in China;

[0013] Figure 5 The schematic diagram of the hydraulic system for normal operation of the fan motor;

[0014] Figure 6 This is the schematic diagram of the hydraulic system when the oil supply to the fan motor stops;

[0015] In the figure: 1. valve body, 2. valve seat, 3. pressure regulating spring, 4. valve core, 5. pressure regulating screw, 6. cone spring, 7. gasket, 8. O-ring, 9. elastic retaining ring for hole. DETAILED DESCRIPTION

[0016] The utility model is further described below.

[0017] Referring to the accompanying drawings, a direct-acting oil-making overflow valve is characterized in that it includes an overflow valve and a valve body 1, wherein the overflow valve is arranged as a whole in the valve body 1, and the overflow valve includes a valve core 4, on which a valve seat 2 and a pressure-adjusting screw 5 are arranged, and a pressure-adjusting spring 3 is arranged between the valve seat 2 and the pressure-adjusting screw 5, a gasket 7 and a hole elastic retaining ring 9 are arranged at the right end of the valve body 1, and a conical spring 6 is arranged between the pressure-adjusting screw 5 and the gasket 7.

[0018] In this preferred embodiment, the cross section of the pressure regulating screw 5 is configured to be a cross shape, and the outer edge of the pressure regulating screw 5 is configured to be a spherical surface.

[0019] In this preferred embodiment, the valve seat 2 and the valve body 1, as well as the valve seat 2 and the valve core 4, are both sealed by conical surfaces.

[0020] In this preferred embodiment, an O-ring is disposed on the outer circumference of the valve body 1 .

[0021] In specific implementation, the working principle of the overflow valve in the hydraulic system driving the fan motor is as follows: Figure 5 As shown, when the motor is working normally, the hydraulic pump provides power oil to drive the motor to rotate, and the hydraulic oil returns to the oil tank after passing through the motor. At this time, the P port is under high pressure, and the valve core 4 and the valve seat 2 remain in a closed state. When the pressure at the P port exceeds a certain value, the valve core 4 opens to achieve overflow, which plays an overload protection role for the hydraulic system; when the motor of the hydraulic pump is turned off, the fan motor is no longer supplied with oil and needs to stop working. The fan will continue to rotate due to inertia. At this time, the motor is functionally equivalent to a hydraulic pump. If the oil cannot be supplied in time, air suction will occur, which will have adverse effects on the motor and the hydraulic system. Since the overflow valve has an oil replenishment function, when the motor is in an air suction state, the one-way valve opens under the action of atmospheric pressure, and the hydraulic oil flows reversely from the T port to the P port to achieve the oil replenishment function, which can effectively protect the hydraulic motor and the hydraulic system. Figure 6 An electromagnetic one-way throttle valve is set between the oil outlet of the fan motor and the oil tank. When the motor of the hydraulic pump is turned off, the electromagnetic valve is energized, which increases the oil return resistance of the fan motor through throttling, acts as a brake on the motor rotating by inertia, and shortens its stop time.

[0022] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A direct-acting oil-supply relief valve, characterized in that: The invention comprises a relief valve and a valve body (1), wherein the relief valve is arranged as a whole in the valve body (1), the relief valve comprises a valve core (4), a valve seat (2) and a pressure regulating screw (5) are arranged on the valve core (4), a pressure regulating spring (3) is arranged between the valve seat (2) and the pressure regulating screw (5), a gasket (7) and a hole elastic retaining ring (9) are arranged at the right end of the valve body (1), and a cone spring (6) is arranged between the pressure regulating screw (5) and the gasket (7).

2. The direct-acting oil-supply relief valve according to claim 1 is characterized in that: The cross section of the pressure regulating screw (5) is arranged in a cross shape, and the outer edge of the pressure regulating screw (5) is arranged in a spherical surface.

3. The direct-acting oil-supply relief valve according to claim 1 is characterized in that: The valve seat (2) and the valve body (1), as well as the valve seat (2) and the valve core (4) are all sealed by conical surfaces.

4. The direct-acting oil-supply relief valve according to claim 1 is characterized in that: The outer circle of the valve body (1) is provided with an O-ring.

Images