Adjusting rod pressure reducing device

Abstract

The invention belongs to the technical field of overflow valves, and particularly relates to an adjusting rod pressure reducing device which comprises an adjusting rod, the adjusting rod is of a stepped shaft structure, the large diameter of the adjusting rod is provided with threads and connected to one end of a valve body in a threaded mode, a pressure reducing seat and a spring seat are slidably connected into the valve body, and the small diameter end of the adjusting rod extends into the valve body. The small-diameter end of the adjusting rod penetrates through the pressure reducing seat and is in sliding connection with the pressure reducing seat, the small-diameter end of the adjusting rod abuts against the spring seat, supporting protruding columns are formed on the side, close to the spring seat, of the pressure reducing seat and are of a plurality of boss structures arranged annularly, and communicating gaps are formed between the supporting protruding columns; through the pressure reducing seat and the supporting convex column, oil liquid reaches the pressure reducing cavity, at the moment, the pressure of the oil liquid on the pressure reducing seat can be transmitted to the valve body to be blocked on the adjusting rod, the pressure of the oil liquid on the pressure reducing cavity can give a reverse force to the spring seat, and the oil pressures on the two sides of the spring seat are the same, so that the torsion required for rotating the adjusting rod is reduced; the threshold value of the overflow valve is convenient to adjust.

Description

Technical Field

[0001] The invention belongs to the technical field of overflow valves, and in particular relates to an adjusting rod pressure reducing device. Background Art

[0002] A hydraulic valve is an automatic component operated by pressure oil. It is controlled by the pressure oil of a pressure distribution valve and is usually used in combination with an electromagnetic pressure distribution valve. It can be used to remotely control the on / off of the oil, gas, and water pipeline systems of a hydropower station, and is often used for clamping, controlling, lubricating, and other oil circuits. The main function of a hydraulic valve in a hydraulic system is to control and adjust the flow direction, pressure, and flow of the oil in the hydraulic system so that the actuator and the working mechanism it drives can obtain the required direction of movement, thrust (torque), and speed (speed), etc. Hydraulic valves can be divided into many types according to their functions, including flow valves (such as throttle valves, speed regulating valves, and flow dividing and collecting valves), pressure valves (such as relief valves, pressure reducing valves, sequence valves, and unloading valves), and directional valves (such as electromagnetic reversing valves, manual reversing valves, check valves, and hydraulically controlled check valves), etc. These different types of hydraulic valves each play an important role in the hydraulic system.

[0003] The internal structure of the existing direct-acting relief valve is as follows: Figure 1 As shown, during operation, the flow enters the relief valve from port P. When the pressure at port P reaches the spring set value, the flow overflows from port T. Due to the direct-acting structure, it will be difficult to adjust the relief set value when the pressure at port P is high or there is back pressure at port T. The reason is that the adjusting rod is subjected to a large oil back pressure, which makes the adjusting torque of the adjusting rod become very large, and even the hexagon inside the adjusting rod is damaged. This problem is not only caused by the relief valve, but also by any valve that is difficult to adjust.

[0004] In order to solve the above problems, the present application proposes an adjusting rod pressure reducing device. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides an adjusting rod pressure reducing device, which has the characteristics of reducing the pressure on the adjusting rod and facilitating the adjustment and control of the overflow valve.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjusting rod pressure reducing device, comprising an adjusting rod, the adjusting rod being a stepped shaft structure, the large diameter of the adjusting rod being provided with a thread, and being threadedly connected to one end of the valve body, the valve body being slidably connected with a pressure reducing seat and a spring seat, the small diameter end of the adjusting rod extending into the valve body, and the small diameter end of the adjusting rod passing through the pressure reducing seat and being slidably connected to the pressure reducing seat, the small diameter end of the adjusting rod being in conflict with the spring seat, a supporting boss being formed on one side of the pressure reducing seat close to the spring seat, the supporting boss being a plurality of boss structures arranged in a ring, a connecting gap being formed between the supporting bosses, and the pressure reducing seat and the supporting bosses forming a pressure reducing chamber.

[0007] As a preferred embodiment of the regulating rod decompression device of the present invention, a cavity matching the major diameter of the regulating rod is formed on a side of the decompression seat close to the regulating rod.

[0008] As a preferred embodiment of the regulating rod decompression device of the present invention, the outer side wall of the decompression seat is provided with a first sealing groove, and a first sealing ring is installed in the first sealing groove.

[0009] As a preferred adjusting rod decompression device of the present invention, a second sealing groove is opened on the side of the decompression seat close to the supporting boss, and a sealing retaining ring and a second sealing ring are installed in the second sealing groove. The sealing retaining ring and the second sealing ring are sleeved on the small diameter end of the adjusting rod.

[0010] As a preferred embodiment of the adjusting rod pressure reducing device of the present invention, when the adjusting rod is adjusted to a maximum stroke, there is a gap between the step surface of the adjusting rod and the inner surface of the pressure reducing seat.

[0011] As a preferred embodiment of the adjusting rod pressure reducing device of the present invention, the end surface of the large diameter end of the adjusting rod is a hexagonal groove.

[0012] As a preferred embodiment of the regulating rod decompression device of the present invention, the spring seat matches the decompression seat, and a through groove is provided on the surface of the spring seat at a position corresponding to the gap between the supporting bosses.

[0013] As a preferred embodiment of the regulating rod pressure reducing device of the present invention, a locking nut is installed on the outer side wall of the regulating rod, and the locking nut is in conflict with the surface of the valve body.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention allows oil to reach the decompression chamber through the decompression seat and the supporting convex column. At this time, the oil pressure on the decompression seat will be transmitted to the valve body and blocked on the adjusting rod, and the oil pressure in the decompression chamber will give a reverse force to the spring seat. The oil pressure on both sides of the spring seat is the same, thereby reducing the torque required for adjusting the adjusting rod and facilitating the adjustment of the threshold value of the relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a cross-sectional structural schematic diagram of an existing adjustable direct-acting relief valve; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic cross-sectional structural diagram of the decompression seat in the present invention; Figure 4It is a right side structural schematic diagram of the decompression seat in the present invention; Figure 5 It is a structural schematic diagram of the adjustment rod in the present invention; In the figure: 1. adjusting rod; 2. valve body; 3. first sealing ring; 4. pressure reducing seat; 5. supporting boss; 6. sealing retaining ring; 7. second sealing ring; 8. spring seat. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1 The existing overflow valve structure is as follows Figure 1 As shown in the figure, this is a schematic diagram of the structure of a classic large-flow, large-pressure adjustable direct-acting relief valve. The flow enters the relief valve from port P. When the pressure at port P reaches the spring setting value, the flow overflows from port T. Due to the direct-acting structure, when the pressure at port P is high or there is back pressure at port T, it will be difficult to adjust the overflow setting value. The reason is that the adjusting rod is subjected to a large oil back pressure, which makes the adjusting torque of the adjusting rod become very large, and even the hexagon inside the adjusting rod is damaged. In order to solve the above problems, this scheme designs an adjusting rod pressure reducing device.

[0018] like Figures 2 to 5 As shown; A regulating rod pressure reducing device comprises a regulating rod 1, wherein the regulating rod 1 is a stepped shaft structure, the major diameter of the regulating rod 1 is provided with a thread and is threadedly connected to one end of a valve body 2, a pressure reducing seat 4 and a spring seat 8 are slidably connected in the valve body 2, the minor diameter end of the regulating rod 1 extends into the valve body 2, and the minor diameter end of the regulating rod 1 passes through the pressure reducing seat 4 and is slidably connected to the pressure reducing seat 4, the minor diameter end of the regulating rod 1 abuts against the spring seat 8, a supporting boss 5 is formed on one side of the pressure reducing seat 4 close to the spring seat 8, the supporting boss 5 is a plurality of boss structures arranged in a ring, a connecting gap is formed between the supporting bosses 5, and the pressure reducing seat 4 and the supporting bosses 5 form a pressure reducing chamber.

[0019] In this embodiment: the pressure reducing seat 4 and the supporting boss 5 in the present invention together constitute a pressure reducing chamber. When the threshold of the relief valve needs to be adjusted, the operator only needs to turn the adjusting rod 1. The large diameter portion of the adjusting rod 1 is connected to the valve body 2 by a thread. Therefore, turning the adjusting rod can move it into the valve body 2. The small diameter portion of the adjusting rod 1 passes through the pressure reducing seat 4 and pushes the spring seat 8 to move. This movement process will drive the spring to compress, thereby changing the threshold of the relief valve and achieving pressure regulation. There is a certain gap between the supporting bosses 5 on the surface of the pressure reducing seat 4. This design allows the hydraulic oil to flow through these gaps, ensuring that the oil pressure on both sides of the spring seat 8 remains the same. Since the oil pressure acts on the pressure reducing seat 4, the operator can feel the labor-saving effect when turning the adjusting rod 1. This design not only improves the convenience of operation, but also helps to extend the service life of the relief valve.

[0020] The pressure relief seat 4 introduces oil pressure and shares it with the valve body 2 and the spring seat 8, blocking and reducing the force area of ​​the regulating rod 1; when the valve is already open, there is back pressure at the T port or the pressure at the P port is too large, the oil enters the pressure relief chamber from the a pore structure of the pressure relief seat 4. At this time, the oil pressure on the pressure relief seat 4 will be transmitted to the valve body 2 and blocked on the regulating rod 1, and the oil pressure in the pressure relief chamber will give a reverse force to the spring seat 8, so that after the relief valve is opened, the pressure area of ​​the oil pressure on the regulating rod 1 is , and force value F1= , the adjusting rod 1 can be easily adjusted by only overcoming the force value F1.

[0021] The length f on the pressure reducing seat 4 ensures the pressure adjustment value, and the length g on the adjusting rod 1 must be greater than a certain value so that when the adjusting rod 1 adjusts the pressure to the maximum value, there is a gap between the side i and the pressure reducing seat 4 to ensure that the pressure on the pressure reducing seat 4 will not be transmitted to the adjusting rod 1.

[0022] However, the pressure reducing device with the pressure reducing seat 4 and the adjusting rod 1 needs to increase the length of the valve, which is suitable for a large pressure regulating valve. The pressure bearing area of ​​the adjusting rod 1 is , and force value F1= It is determined by the diameter end φf of the adjusting rod 1, but φf cannot be too small to cause excessive stress and damage the adjusting rod 1. The a-pore structure of the pressure reducing seat 4 is designed to be variable, and the length b of the a-pore structure is also variable. In response to different working conditions, the a-pore structure can increase the damping effect and reduce the howling phenomenon.

[0023] This design method is designed based on the balanced hydraulic principle of the pressure reducing seat 4, and its feasibility has been verified through experiments. This design technology is mainly used for pressure regulating valves in a broad sense, and large flow and high pressure valves for regulating pressure are more practical.

[0024] More specifically: In an optional embodiment, a cavity matching the major diameter of the adjusting rod 1 is formed on a side of the decompression seat 4 close to the adjusting rod 1 .

[0025] In this embodiment, the design of the cavity cleverly achieves the storage of the adjusting rod 1 and the reduction of the size of the relief valve. In the process of adjusting the threshold, the adjusting rod 1 moves into the valve body 2 by rotating. In this movement process, the cavity plays a key role, and it can accommodate a part of the length of the adjusting rod 1 while the adjustment stroke remains unchanged.

[0026] This design not only ensures the normal realization of the adjustment function, but also brings significant advantages: the overall length of the relief valve is shortened, thereby reducing the size of the relief valve. The cavity is used as a storage space for the adjustment rod 1 when it moves. Its size and shape are carefully designed to ensure that the adjustment rod 1 can enter and be accommodated smoothly when it moves. In this way, even if the adjustment rod 1 is moving, it will not increase the overall length of the relief valve. On the contrary, due to the existence of the cavity, part of the length of the adjustment rod 1 is cleverly "hidden", so that the relief valve is more compact and small while maintaining the original adjustment function.

[0027] Going further: In an optional embodiment, a first sealing groove is formed on the outer side wall of the decompression seat 4, and a first sealing ring 3 is installed in the first sealing groove.

[0028] In this embodiment: Through this design, the first sealing ring 3 effectively seals the gap between the valve body 2 and the pressure reducing seat 4, ensuring that the hydraulic oil will not flow out of the gap. In the hydraulic system, the valve body 2 is a key component, and its interior carries high-pressure hydraulic oil. The pressure reducing seat 4, as an important component for regulating oil pressure, closely cooperates with the valve body 2. Since the oil pressure in the valve body 2 directly acts on the pressure reducing seat 4, reliable sealing measures must be taken to prevent hydraulic oil leakage. The first sealing ring 3 is designed to meet this sealing requirement. It is installed on the contact surface between the valve body 2 and the pressure reducing seat 4, and effectively blocks the gap between the two through its elastic deformation and close contact. In this way, even if the oil pressure in the valve body 2 changes, the hydraulic oil cannot flow out of the gap between the first sealing ring 3 and the pressure reducing seat 4, thereby ensuring the stability and reliability of the hydraulic system.

[0029] Going further: In an optional embodiment, a second sealing groove is opened on the side of the decompression seat 4 close to the supporting boss 5, and a sealing ring 6 and a second sealing ring 7 are installed in the second sealing groove. The sealing ring 6 and the second sealing ring 7 are sleeved on the small diameter end of the adjusting rod 1.

[0030] In this embodiment: the sealing ring 6 and the second sealing ring 7 are used to seal the gap between the adjusting rod 1 and the pressure reducing seat 4 to prevent the hydraulic oil from flowing out of the gap. Due to the sealing requirements, the sealing ring 6 and the second sealing ring 7 need to be added to seal the oil, and the diameter h of the adjusting rod 1 and the diameter e of the pressure reducing seat 4 should form an O-ring groove matching relationship, and the length should be long enough so that the sealing ring 6 and the second sealing ring 7 will not fall off during the pressure regulating process.

[0031] Going further: In an optional embodiment, when the adjusting rod 1 is adjusted to the maximum stroke, there is a gap between the step surface of the adjusting rod 1 and the inner surface of the decompression seat 4 .

[0032] In this embodiment: through this design, pressure is prevented from being generated between the adjusting rod 1 and the pressure reducing seat 4, ensuring that the pressure reducing seat 4 bears the oil pressure in the valve body 2 without acting on the adjusting rod 1, thereby reducing the pressure on the adjusting rod 1 and facilitating the adjustment of the adjusting rod 1.

[0033] Going further: In an optional embodiment, the end surface of the large diameter end of the adjusting rod 1 is a hexagonal groove.

[0034] In this embodiment: through this design, when the staff adjusts 1, the adjustment can be achieved by inserting the hexagonal wrench into the groove and turning the hexagonal wrench, which is convenient for the staff to operate.

[0035] Going further: In an optional embodiment, the spring seat 8 matches the decompression seat 4 , and a through groove is provided on the surface of the spring seat 8 at a position corresponding to the gap of the supporting boss 5 .

[0036] In this embodiment: Through this design, the through groove design opened on the surface of the spring seat 8 helps the hydraulic oil to flow more smoothly to the other side of the spring seat 8, and enter the decompression chamber through the gap of the supporting boss 5, thereby effectively reducing the back pressure strength acting on the adjusting rod 1. As an important component in the hydraulic system, the through groove opened on the surface of the spring seat 8 plays a key role. This design allows the hydraulic oil to pass through the spring seat 8 more easily and flow to the other side. During the flow of the hydraulic oil, the through groove provides the necessary channel so that the oil can pass smoothly without generating additional pressure due to obstruction. At the same time, the gap between the supporting boss 5 and the spring seat 8 also plays an important role in guiding the flow. These gaps allow the hydraulic oil to pass more freely during the flow process, further reducing the resistance of the oil flow. When the hydraulic oil enters the decompression chamber through these gaps, it can be more evenly distributed, thereby reducing the back pressure strength on the adjusting rod 1.

[0037] It should be noted that a locking nut is installed on the outer side wall of the adjusting rod 1 , and the locking nut and the surface of the valve body 2 are in conflict with each other.

[0038] Working principle and use process of the present invention: The pressure reducing seat 4 and the supporting boss 5 in the present invention together constitute a pressure reducing chamber. When the threshold of the relief valve needs to be adjusted, the operator only needs to turn the adjusting rod 1. The large diameter part of the adjusting rod 1 is connected to the valve body 2 by a thread, so turning the adjusting rod can make it move into the valve body 2, and the small diameter part of the adjusting rod 1 passes through the pressure reducing seat 4, pushing the spring seat 8 to move. This movement process will drive the spring to compress, thereby changing the threshold of the relief valve and realizing pressure regulation. There is a certain gap between the supporting bosses 5 on the surface of the pressure reducing seat 4. This design allows the hydraulic oil to flow through these gaps to ensure that the oil pressure on both sides of the spring seat 8 remains the same. Since the oil pressure acts on the pressure reducing seat 4, the operator can feel the labor-saving effect when turning the adjusting rod 1. This design not only improves the convenience of operation, but also helps to extend the service life of the relief valve.

[0039] The pressure relief seat 4 introduces oil pressure and shares it with the valve body 2 and the spring seat 8, blocking and reducing the force area of ​​the regulating rod 1; when the valve is already open, there is back pressure at the T port or the pressure at the P port is too large, the oil enters the pressure relief chamber from the a pore structure of the pressure relief seat 4. At this time, the oil pressure on the pressure relief seat 4 will be transmitted to the valve body 2 and blocked on the regulating rod 1, and the oil pressure in the pressure relief chamber will give a reverse force to the spring seat 8, so that after the relief valve is opened, the pressure area of ​​the oil pressure on the regulating rod 1 is , and force value F1= , the adjusting rod 1 can be easily adjusted by only overcoming the force value F1.

[0040] The length f on the pressure reducing seat 4 ensures the pressure adjustment value, and the length g on the adjusting rod 1 must be greater than a certain value so that when the adjusting rod 1 adjusts the pressure to the maximum value, there is a gap between the side i and the pressure reducing seat 4 to ensure that the pressure on the pressure reducing seat 4 will not be transmitted to the adjusting rod 1.

[0041] However, the pressure reducing device with the pressure reducing seat 4 and the adjusting rod 1 needs to increase the length of the valve, which is suitable for a large pressure regulating valve. The pressure bearing area of ​​the adjusting rod 1 is , and force value F1= It is determined by the diameter end φf of the adjusting rod 1, but φf cannot be too small to cause excessive stress and damage the adjusting rod 1. The a-pore structure of the pressure reducing seat 4 is designed to be variable, and the length b of the a-pore structure is also variable. In response to different working conditions, the a-pore structure can increase the damping effect and reduce the howling phenomenon.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned 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 present invention shall be included in the protection scope of the present invention.

Claims

1. An adjusting rod pressure reducing device, characterized in that: The utility model comprises an adjusting rod (1), wherein the adjusting rod (1) is a stepped shaft structure, the major diameter of the adjusting rod (1) is provided with a thread and is threadedly connected to one end of a valve body (2), a pressure reducing seat (4) and a spring seat (8) are slidably connected in the valve body (2), the minor diameter end of the adjusting rod (1) extends into the valve body (2), and the minor diameter end of the adjusting rod (1) passes through the pressure reducing seat (4) and is slidably connected to the pressure reducing seat (4), the minor diameter end of the adjusting rod (1) and the spring seat (8) are in conflict with each other, a supporting boss (5) is formed on one side of the pressure reducing seat (4) close to the spring seat (8), the supporting boss (5) is a plurality of boss structures arranged in an annular manner, a connecting gap is formed between the supporting bosses (5), and the pressure reducing seat (4) and the supporting boss (5) form a pressure reducing chamber.

2. The regulating rod pressure reducing device according to claim 1, characterized in that: A cavity matching the major diameter of the adjusting rod (1) is provided on a side of the decompression seat (4) close to the adjusting rod (1).

3. The regulating rod pressure reducing device according to claim 2, characterized in that: The outer side wall of the decompression seat (4) is provided with a first sealing groove, and a first sealing ring (3) is installed in the first sealing groove.

4. The regulating rod pressure reducing device according to claim 3, characterized in that: A second sealing groove is formed on a side of the pressure reducing seat (4) close to the supporting boss (5), a sealing retaining ring (6) and a second sealing ring (7) are installed in the second sealing groove, and the sealing retaining ring (6) and the second sealing ring (7) are sleeved on the small diameter end of the adjusting rod (1).

5. The regulating rod pressure reducing device according to claim 4, characterized in that: When the adjusting rod (1) is adjusted to the maximum stroke, a gap exists between the step surface of the adjusting rod (1) and the inner surface of the decompression seat (4).

6. The regulating rod pressure reducing device according to claim 4, characterized in that: The end surface of the large diameter end of the adjusting rod (1) is a hexagonal groove.

7. The regulating rod pressure reducing device according to claim 4, characterized in that: The spring seat (8) matches the pressure reducing seat (4), and a through groove is provided on the surface of the spring seat (8) at a position corresponding to the gap of the supporting boss (5).

8. The regulating rod pressure reducing device according to claim 4, characterized in that: A locking nut is mounted on the outer side wall of the regulating rod (1), and the locking nut is in contact with the surface of the valve body (2).

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