Hydraulic cut-off type variable speed operating valve

Abstract

The utility model discloses a hydraulic cut-off type variable speed operating valve which comprises a hydraulic cut-off valve and an operating valve body, the hydraulic cut-off valve is installed on the operating valve body and comprises a valve body, a reset spring, a valve rod, a first O-shaped ring, a second O-shaped ring and a valve seat, and the reset spring is fixedly installed on the inner wall of one side of the valve body. The valve rod is installed in the valve body in a sliding mode, one end of the reset spring is fixedly connected with the valve rod, the first O-shaped ring is arranged on the valve rod, the second O-shaped ring is arranged in the valve body, the valve seat is inserted in the valve body, the second O-shaped ring is matched with the valve seat, an annular groove is formed in the valve rod, the annular groove is matched with the first O-shaped ring, and the reset spring is fixedly connected with the valve rod. And a top block is fixedly mounted at one end of the valve rod. The hydraulic cut-off type variable-speed operating valve has the advantages that the cut-off valve can be conveniently connected and disconnected, the interior of the cut-off valve is sealed, and the situation that water enters the interior of the cut-off valve to cause rusting and dust enters the interior of the cut-off valve to affect the cut-off performance is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of cut-off valves, in particular to a hydraulic cut-off type speed-changing control valve. Background Art

[0002] The cut-off valve is a type of actuator in the automation system, which is composed of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve. The cut-off valve has a wide range of uses and can be used to cut off gas, combustion air, cold air and flue gas, etc.

[0003] However, at present, the loader gearbox mainly adopts the pneumatic cut-off type control valve. Because the cut-off valve body has a hole drilled on it for exhaust, the inner cavity of the valve body is easy to rust when it comes into contact with air moisture. At the same time, dust can easily enter the cut-off valve through the exhaust hole, affecting the cut-off performance of the cut-off valve. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic cut-off type speed control valve, which can facilitate the connection and disconnection of the cut-off valve, seal the inside of the cut-off valve, prevent moisture from entering the cut-off valve to cause rust and dust from entering to affect the cut-off performance, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic cut-off type speed control valve, comprising a hydraulic cut-off valve and a control valve, the hydraulic cut-off valve being installed on the control valve, the hydraulic cut-off valve comprising a valve body, a return spring, a valve stem, an O-ring 1, an O-ring 2 and a valve seat, the return spring being fixedly installed on an inner wall of one side of the valve body, the valve stem being slidably installed in the valve body, one end of the return spring being fixedly connected to the valve stem, the O-ring 1 being arranged on the valve stem, the O-ring 2 being arranged in the valve body, the valve seat being inserted in the valve body, and the O-ring 2 being adapted to the valve seat.

[0006] Furthermore, a ring groove is provided on the valve stem, and the ring groove is matched with the O-ring.

[0007] Furthermore, a top block is fixedly mounted on one end of the valve stem, and the top block is cylindrical.

[0008] Furthermore, an oil return port 1 is provided on the outer wall of the valve body, an oil return port 2 is provided on the outer wall of the valve seat, and an oil inlet is provided on the outer wall of the valve seat.

[0009] Furthermore, an oil discharge passage 1 is opened on the inner wall of the oil return port 2, and an oil discharge passage 2 is opened on the inner wall of the oil inlet.

[0010] In summary, due to the adoption of the above technology, the beneficial effects of the utility model are:

[0011] When the utility model supplies oil through the valve seat through the hydraulic cut-off valve, the hydraulic oil enters the valve seat, the hydraulic oil enters and squeezes the valve stem to move leftward, the valve stem moves and squeezes the return spring, the return spring is squeezed to deform and accumulate elastic force, the valve stem drives the O-ring one and the O-ring three to move, the valve stem fits with the valve body, the main oil circuit in the operating valve and the oil circuit controlled by the hydraulic cut-off valve are in a state of mutual connection, the connection and disconnection of the cut-off valve are convenient, the inside of the cut-off valve is sealed, and the inside of the cut-off valve is prevented from entering the moisture to cause rust and entering the dust to affect the cut-off performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a top view structural schematic diagram of a hydraulic cut-off speed-changing control valve of the utility model;

[0013] Figure 2 It is a cross-sectional structural schematic diagram of a hydraulic cut-off type speed-changing control valve in a cut-off state of the utility model;

[0014] Figure 3 The utility model is a cross-sectional structural schematic diagram of a hydraulic cut-off speed change control valve in a connected state.

[0015] In the figure: 1. Hydraulic shut-off valve; 2. Control valve; 3. Valve body; 31. Oil return port 1; 4. Return spring; 5. Valve stem; 6. O-ring 1; 7. O-ring 2; 8. Valve seat; 81. Oil return port 2; 82. Oil inlet; 9. Locking nut; 10. O-ring 3; 11. Threaded joint; 12. O-ring 4. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0017] The utility model provides Figure 1-3As shown, a hydraulic cut-off type speed control valve comprises a hydraulic cut-off valve 1 and a control valve 2, wherein the hydraulic cut-off valve 1 is mounted on the control valve 2, and the hydraulic cut-off valve 1 comprises a valve body 3, a return spring 4, a valve stem 5, an O-ring 1 6, an O-ring 2 7 and a valve seat 8, wherein the return spring 4 is fixedly mounted on an inner wall of one side of the valve body 3, the valve stem 5 is slidably mounted in the valve body 3, one end of the return spring 4 is fixedly connected to the valve stem 5, the O-ring 1 6 is arranged on the valve stem 5, the O-ring 2 7 is arranged in the valve body 3, the valve seat 8 is inserted in the valve body 3, and the O-ring 2 7 and the valve seat 8 are slidably mounted in the valve body 3, and the return spring 4 is fixedly connected to the valve stem 5, the O-ring 1 6 is arranged on the valve stem 5, the O-ring 2 7 is arranged in the valve body 3, and the valve seat 8 is inserted in the valve body 3. The hydraulic oil enters the valve seat 8 and squeezes the valve stem 5 to move to the left. The valve stem 5 moves and squeezes the return spring 4. The return spring 4 is deformed and accumulates elastic force due to the squeezing. The valve stem 5 drives the O-ring 1 6 and the O-ring 3 10 to move. The valve stem 5 fits with the valve body 3. The main oil circuit in the operating valve 2 and the oil circuit controlled by the hydraulic cut-off valve 1 are in a state of mutual connection, which is convenient for connecting and disconnecting the cut-off valve, and the inside of the cut-off valve is sealed to prevent moisture from entering the inside of the cut-off valve to cause rust and dust from entering to affect the cut-off performance.

[0018] In addition, a ring groove is provided on the valve stem 5, and the ring groove is adapted to the O-ring 6.

[0019] In some embodiments, a top block is fixedly installed on one end of the valve stem 5, and the top block is cylindrical. More specifically, when the valve stem 5 moves, the valve stem 5 drives the top block to move, and the top block moves in the valve body 3. The top block fits with the valve body 3 to limit the valve stem 5, preventing the valve stem 5 from excessively squeezing the reset spring 4, causing the reset spring 4 to deform and be difficult to reset.

[0020] like Figure 2 As shown, an oil return port 1 31 is provided on the outer wall of the valve body 3, an oil return port 2 81 is provided on the outer wall of the valve seat 8, and an oil inlet port 82 is provided on the outer wall of the valve seat 8. More specifically, the main oil circuit in the control valve 2 and the oil circuit in the hydraulic cut-off valve 1 are in a mutually disconnected state, and the residual oil squeezed out by the movement of the O-ring 1 6 and the O-ring 3 10, the residual hydraulic oil gathers in the valve body 3 and the valve seat 8 and is discharged through the oil return port 1 31 and the oil return port 2 81, so as to facilitate the discharge of the hydraulic oil.

[0021] In addition, an oil discharge passage 1 is opened on the inner wall of the second oil return port 81 , and an oil discharge passage 2 is opened on the inner wall of the oil inlet port 82 .

[0022] like Figure 2 As shown, in some embodiments, a locking nut 9 is threadedly mounted on the valve seat 8, and an O-ring 10 is sleeved on the valve stem 5.

[0023] In some embodiments, a threaded joint 11 is threadedly installed on the valve seat 8, and an O-ring 412 is sleeved on the valve seat 8, and the O-ring 412 is adapted to the threaded joint 11.

[0024] Working principle:

[0025] First, when the hydraulic shut-off valve 1 supplies oil through the valve seat 8, the hydraulic oil enters the valve seat 8, the hydraulic oil enters and squeezes the valve stem 5 to move to the left, the valve stem 5 moves and squeezes the return spring 4, the return spring 4 is squeezed to produce deformation and accumulate elastic force, the valve stem 5 drives the O-ring 1 6 and the O-ring 3 10 to move, the valve stem 5 fits with the valve body 3, the main oil circuit in the control valve 2 and the oil circuit controlled by the hydraulic shut-off valve 1 are in a state of mutual connection, the control valve 2 can realize the gear operation, when the valve seat 8 stops to the valve When oil is supplied in the body 3, the valve stem 5 loses the extrusion of the hydraulic oil, and the return spring 4 releases its elastic force to push the valve stem 5 to move rightward and reset, and the hydraulic oil returns to the original path. The main oil circuit in the control valve 2 and the oil circuit in the hydraulic cut-off valve 1 are disconnected from each other, and the excess oil squeezed out by the O-ring 1 6 and the O-ring 3 10 is discharged through the valve body 3 and the valve seat 8. The O-ring 2 7 and the O-ring 4 12 are in a static sealing state, and the hydraulic cut-off valve 1 is statically sealed. At this time, the connection and cut-off of the hydraulic cut-off valve 1 are completed.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A hydraulic cut-off speed control valve, comprising a hydraulic cut-off valve and a control valve, characterized in that: The hydraulic cut-off valve is installed on the operating valve, and the hydraulic cut-off valve includes a valve body, a return spring, a valve stem, an O-ring 1, an O-ring 2 and a valve seat. The return spring is fixedly installed on an inner wall of one side of the valve body, and the valve stem is slidably installed in the valve body. One end of the return spring is fixedly connected to the valve stem, the O-ring 1 is arranged on the valve stem, the O-ring 2 is arranged in the valve body, the valve seat is inserted in the valve body, and the O-ring 2 is adapted to the valve seat.

2. The hydraulic cut-off speed control valve according to claim 1, characterized in that: The valve stem is provided with an annular groove, and the annular groove is matched with the O-ring.

3. The hydraulic cut-off speed control valve according to claim 1, characterized in that: A top block is fixedly mounted on one end of the valve stem, and the top block is cylindrical.

4. The hydraulic cut-off speed control valve according to claim 1, characterized in that: An oil return port 1 is provided on the outer wall of the valve body, an oil return port 2 is provided on the outer wall of the valve seat, and an oil inlet is provided on the outer wall of the valve seat.

5. The hydraulic cut-off speed control valve according to claim 4, characterized in that: An oil discharge passage 1 is provided on the inner wall of the oil return port 2, and an oil discharge passage 2 is provided on the inner wall of the oil inlet.

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