Overflow valve

Abstract

The utility model discloses an overflow valve which comprises a valve seat, a motor, a push rod, a spring and a valve element. The motor is arranged at one end of the valve seat; the valve seat is provided with a sliding groove, an oil inlet, an oil return opening and a circulation groove, the axis of the sliding groove coincides with the axis of the valve seat, the sliding groove penetrates through the end, close to the motor, of the valve seat, the oil inlet and the oil return opening are formed in the side face of the valve seat, the oil inlet and the oil return opening are communicated with the sliding groove, and the circulation groove is communicated with the sliding groove. One end of the circulation groove communicates with one side of the oil inlet, and the other end of the circulation groove communicates with the end, away from the motor, of the sliding groove; the push rod, the spring and the valve element are sequentially and movably arranged in the sliding groove, the motor is connected with the push rod in a driving mode, the valve element is located on the side of the oil inlet and the side of the oil return opening, and the valve element is provided with an annular cylinder groove. The overflow valve has the advantages of being high in reliability, high in response speed and accurate in pressure control.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a relief valve. Background Art

[0002] The relief valve is a pressure control valve in the hydraulic system, which plays the role of constant pressure relief and safety protection in the hydraulic system. The existing relief valve is mainly composed of a valve body, a valve core, a pressure regulating spring and a pressure regulating screw (or handle). The electromagnetic relief valves widely used in the existing hydraulic system are all in the form of a combination of an electromagnetic reversing valve and a pilot relief valve.

[0003] In the prior art, ultra-high pressure relief valves are rare, and most of the relief valves are manually adjusted, which cannot achieve a high-response and variable-pressure hydraulic system. For example, patent number CN2013205993416 discloses a direct-acting relief valve, which sets a connecting groove on the reversing valve core to establish a new oil circuit, thereby avoiding the problem of the hydraulic system being unable to build pressure due to the blockage of the damping hole. However, during use, since the relief pressure of the relief valve cannot be changed, the use of the relief valve has certain limitations, and the change of the relief pressure is more complicated, which cannot meet the use of different places. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model aims to provide a relief valve, which has the advantages of high reliability, fast response speed and precise pressure control.

[0005] In order to achieve the purpose of the utility model, the following technical solutions are provided:

[0006] A relief valve comprises a valve seat, a motor, a push rod, a spring and a valve core; the motor is arranged at one end of the valve seat;

[0007] The valve seat is provided with a slide groove, an oil inlet, an oil return port and a circulation groove, the axis of the slide groove and the valve seat coincide, and the slide groove passes through an end of the valve seat close to the motor, the oil inlet and the oil return port are arranged at intervals on the side of the valve seat, and the oil inlet and the oil return port are connected to the slide groove, one end of the circulation groove is connected to one side of the oil inlet, and the other end of the circulation groove is connected to an end of the slide groove away from the motor;

[0008] The push rod, the spring and the valve core are movably arranged in the slide groove in sequence, the push rod is located on the side close to the motor, the motor and the push rod are drivingly connected, the valve core is located on the oil inlet and the oil return port sides, and the valve core is provided with a groove in the shape of a ring cylinder.

[0009] Furthermore, the motor is a servo motor.

[0010] Furthermore, the motor is connected to the push rod via a spline.

[0011] Furthermore, an axially extending thread groove is provided on the outer side surface of the push rod, and a fixing pin adapted to the thread groove is provided in the slide groove.

[0012] Furthermore, the axes of the oil inlet and the oil return port are perpendicular to the axis of the slide groove.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The motor drives the push rod to move axially to change the compression amount of the spring so that the spring exerts a set force F on the valve core;

[0015] When the system pressure P increases, the product force of the system pressure P and the cross-sectional area A of the valve core is greater than the set force F, pushing the valve core to move rightward, the valve core opens, and the valve core connects the oil inlet and the oil return port through the groove, and the fluid flows out and returns to the oil tank;

[0016] When the system pressure P drops, and the product force of the system pressure P and the cross-sectional area A of the valve core is less than the set force F, the force of the spring pushes the valve core to move leftward, the valve core is closed, and the valve core seals the oil return port.

[0017] In this way, the relief valve has the advantages of high reliability, fast response speed and precise pressure control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a cross-sectional view of the overflow valve in the utility model;

[0020] Figure 2 It is a cross-sectional view of the valve seat in the utility model;

[0021] Figure 3 It is a schematic diagram of the push rod in the utility model;

[0022] Explanation of the accompanying numbers: 1-valve seat; 101-slide groove; 102-oil inlet; 103-oil return port; 104-circulation groove; 2-motor; 3-push rod; 301-thread groove; 4-spring; 5-valve core; 501-groove; 6-spline; 7-fixing pin. DETAILED DESCRIPTION

[0023] In order to facilitate a better understanding of the purpose, structure, features and efficacy of the utility model, the utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that the features shown in the figures are not necessarily drawn to scale. In addition, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] like Figure 1 As shown, this embodiment provides a relief valve, including a valve seat 1, a motor 2, a push rod 3, a spring 4, and a valve core 5;

[0026] The motor 2 is arranged at one end of the valve seat 1;

[0027] like Figure 2 As shown, the valve seat 1 is provided with a slide groove 101, an oil inlet 102, an oil return port 103 and a circulation groove 104, the axis of the slide groove 101 and the valve seat 1 coincide, and the slide groove 101 passes through one end of the valve seat 1 close to the motor 2, the oil inlet 102 and the oil return port 103 are arranged at intervals on the side of the valve seat 1, and the oil inlet 102 and the oil return port 103 are connected to the slide groove 101, the oil inlet 102 is located at the end away from the motor 2, one end of the circulation groove 104 is connected to one side of the oil inlet 102, and the other end of the circulation groove 104 is connected to the end of the slide groove 101 away from the motor 2;

[0028] The push rod 3, the spring 4, and the valve core 5 are movably arranged in the slide groove 101 in sequence, the push rod 3 is located on the side close to the motor 2, the motor 2 and the push rod 3 are drivingly connected, the valve core 5 is located on the side of the oil inlet 102 and the oil return port 103, and the valve core 5 is provided with a groove 501 in the form of a ring cylinder.

[0029] The motor 2 drives the push rod 3 to move axially to change the compression amount of the spring 4 so that the spring 4 exerts a set force F on the valve core 5;

[0030] When the system pressure P increases, the product force of the system pressure P and the cross-sectional area A of the valve core 5 is greater than the set force F, pushing the valve core 5 to move rightward, the valve core 5 opens, and the valve core 5 connects the oil inlet 102 and the oil return port 103 through the groove 501, and the fluid flows out and returns to the oil tank;

[0031] When the system pressure P drops, the product force of the system pressure P and the cross-sectional area A of the valve core 5 is less than the set force F, the force of the spring 4 pushes the valve core 5 to move leftward, the valve core 5 is closed, and the valve core 5 seals the oil return port 103.

[0032] In this way, the relief valve has the advantages of high reliability, fast response speed and precise pressure control.

[0033] Preferably, the motor 2 is a servo motor 2 , which is conducive to accurately controlling the force F of the spring 4 on the valve core 5 .

[0034] like Figure 3 As shown, preferably, the motor 2 is connected to the push rod 3 via a spline 6; further, an axially extending threaded groove 301 is provided on the outer side surface of the push rod 3, and a fixing pin 7 adapted to the threaded groove 301 is provided in the slide groove 101. Under the drive of the motor 2, the axial movement of the push rod 3 in the slide groove 101 is achieved through the cooperation between the threaded groove 301 and the fixing pin 7.

[0035] like Figure 2 As shown, preferably, the axes of the oil inlet 102 and the oil return port 103 are perpendicular to the axis of the slide groove 101 .

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A relief valve, characterized in that: It comprises a valve seat (1), a motor (2), a push rod (3), a spring (4), and a valve core (5); the motor (2) is arranged at one end of the valve seat (1); The valve seat (1) is provided with a slide groove (101), an oil inlet (102), an oil return port (103) and a circulation groove (104); the axis of the slide groove (101) and the valve seat (1) coincide with each other, and the slide groove (101) passes through an end of the valve seat (1) close to the motor (2); the oil inlet (102) and the oil return port (103) are arranged at intervals on the side of the valve seat (1), and the oil inlet (102) and the oil return port (103) are connected to the slide groove (101); one end of the circulation groove (104) is connected to one side of the oil inlet (102), and the other end of the circulation groove (104) is connected to an end of the slide groove (101) away from the motor (2); The push rod (3), the spring (4), and the valve core (5) are movably arranged in the slide groove (101) in sequence, the push rod (3) is located on the side close to the motor (2), the motor (2) and the push rod (3) are drivingly connected, the valve core (5) is located on the side of the oil inlet (102) and the oil return port (103), and the valve core (5) is provided with a ring-cylindrical groove (501).

2. A relief valve according to claim 1, characterized in that: The motor (2) is a servo motor.

3. A relief valve according to claim 1, characterized in that: The motor (2) is connected to the push rod (3) via a spline (6).

4. A relief valve according to claim 3, characterized in that: An axially extending thread groove (301) is provided on the outer side surface of the push rod (3), and a fixing pin (7) adapted to the thread groove (301) is provided in the sliding groove (101).

5. A relief valve according to claim 1, characterized in that: The axes of the oil inlet (102) and the oil return port (103) are perpendicular to the axis of the slide groove (101).

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