A control rod pressure relief device

Abstract

The present application belongs to the technical field of overflow valve, especially to a kind of adjusting rod pressure reducing device, including adjusting rod, adjusting rod is ladder shaft structure, the large diameter of adjusting rod is equipped with thread, and is threadedly connected in one end of valve body, pressure reducing seat and spring seat are slidably connected in valve body, the small diameter end of adjusting rod extends to valve body, and the small diameter end of adjusting rod penetrates pressure reducing seat and is slidably connected with pressure reducing seat, the small diameter end of adjusting rod and spring seat abut, the side of pressure reducing seat close to spring seat is formed with support boss column, support boss column is the structure of several bosses arranged in ring, and intercommunication gap is formed between support boss column;The present application passes through pressure reducing seat and support boss column, so that oil reaches into pressure reducing cavity, at this time, oil pressure on pressure reducing seat will be transmitted to valve body to block to adjusting rod, and pressure reducing cavity oil pressure will give spring seat a reverse force, and the oil pressure of both sides of spring seat is same, so as to reduce the torque required for adjusting and turning adjusting rod, to adjust the threshold of overflow valve.

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 automated component operated by pressurized oil. It is controlled by the pressure oil in a pressure-regulating valve and is typically used in combination with a solenoid-controlled pressure-regulating valve. It can be used to remotely control the on / off flow of oil, gas, and water pipelines in hydropower stations. It is also commonly used for clamping, control, and lubrication. The primary function of a hydraulic valve in a hydraulic system is to control and regulate the flow direction, pressure, and flow of the oil in the system, enabling the actuator and its driven working mechanism to achieve the desired direction of motion, thrust (torque), and speed (rotational speed). Hydraulic valves can be divided into various types based on their function, including flow valves (such as throttle valves, speed control valves, and flow-dividing and combining valves), pressure valves (such as relief valves, pressure-reducing valves, sequence valves, and unloading valves), and directional valves (such as solenoid-operated directional valves, manual directional valves, check valves, and hydraulic-controlled check valves). These different types of hydraulic valves each play an important role in a 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 relief valves, but also by valves that are difficult to regulate pressure.

[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 relief 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, a pressure reducing seat and a spring seat being slidably connected in the valve body, 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 the 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, and 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 decompression device of the present invention, when the adjusting rod is adjusted to a maximum stroke, a gap is provided between the step surface of the adjusting rod and the inner surface of the decompression seat.

[0011] As a preferred embodiment of the regulating rod pressure reducing device of the present invention, the end surface of the large diameter end of the regulating 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:

[0015] The present invention uses the decompression seat and the supporting boss to allow the oil to reach the decompression chamber. 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 the spring seat a reverse force. The oil pressure on both sides of the spring seat is the same, thereby reducing the torque required to adjust the adjusting rod and facilitating the adjustment of the threshold of the relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of an existing adjustable direct-acting relief valve;

[0018] Figure 2 It is a schematic cross-sectional view of the present invention;

[0019] Figure 3 Schematic diagram of the cross-sectional structure of the decompression seat of the present invention;

[0020] Figure 4 It is a right side structural schematic diagram of the decompression seat in the present invention;

[0021] Figure 5 Schematic diagram of the structure of the adjustment rod in the present invention;

[0022] In the figure: 1. Adjusting rod; 2. Valve body; 3. First sealing ring; 4. Pressure reducing seat; 5. Support boss; 6. Sealing retaining ring; 7. Second sealing ring; 8. Spring seat. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] 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 set 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 become 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 solution designs an adjusting rod pressure reducing device.

[0026] like Figures 2 to 5 As shown;

[0027] A regulating rod pressure reducing device includes a regulating rod 1, which is a stepped shaft structure. The large 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 inside the valve body 2. The small diameter end of the regulating rod 1 extends into the valve body 2, and the small 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 small diameter end of the regulating rod 1 conflicts with the spring seat 8. A supporting boss 5 is formed on the 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 support boss 5 constitute a pressure reducing chamber.

[0028] 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 value of the relief valve needs to be adjusted, the operator only needs to rotate the adjusting rod 1. The large diameter portion of the adjusting rod 1 is connected to the valve body 2 by a thread, so rotating 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 cause the spring to compress, thereby changing the threshold value 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 rotating 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.

[0029] The pressure reducing seat 4 introduces the 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 and there is back pressure at the T port or the pressure at the P port is too high, the oil enters the pressure reducing chamber from the pore structure a of the pressure reducing seat 4. At this time, the oil pressure on the pressure reducing seat 4 will be transmitted to the valve body 2 and blocked on the regulating rod 1. In addition, the oil pressure in the pressure reducing chamber will give the spring seat 8 a reverse force, so that after the relief valve is opened, the pressure area of ​​the regulating rod 1 is , and force value F1= , the adjusting rod 1 can be easily adjusted by simply overcoming the force value F1.

[0030] The length f on the decompression seat 4 ensures the size of 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 decompression seat 4 to ensure that the pressure on the decompression seat 4 will not be transmitted to the adjusting rod 1.

[0031] However, for the pressure reducing device with the pressure reducing seat 4 and the regulating rod 1, the length of the valve needs to be increased. It is suitable for large pressure regulating valves. The pressure bearing area of ​​the regulating rod 1 is , and force value F1= The diameter of the adjusting rod 1 is determined by its diameter φf, but φf cannot be too small to cause excessive stress and damage the adjusting rod 1. The aperture structure a of the pressure reducing seat 4 is designed to be variable, and the length b of the aperture structure a is also variable. To cope with different working conditions, the aperture structure a can increase the damping effect and thus reduce the whistling phenomenon.

[0032] This design method is designed based on the balanced hydraulic principle of the pressure reducing seat 4, and its feasibility has been verified by experiments. This design technology is mainly used for pressure regulating valves in a broad sense, and is more practical for large flow and high pressure valves for regulating pressure.

[0033] More specifically:

[0034] 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 .

[0035] In this embodiment, the cavity design cleverly accommodates the adjusting rod 1 and reduces the size of the relief valve. During threshold adjustment, the adjusting rod 1 rotates and moves into the valve body 2. The cavity plays a key role in this movement, accommodating a portion of the adjusting rod 1 while maintaining the same adjustment stroke.

[0036] This design not only ensures the proper functioning of the adjustment function but also offers significant advantages: it shortens the overall length of the relief valve, thereby reducing its size. The cavity, which houses the adjusting rod 1 during its movement, has been carefully sized and shaped to ensure smooth access and accommodation. This ensures that even when the adjusting rod 1 moves, the overall length of the relief valve does not increase. Instead, thanks to the cavity, part of the length of the adjusting rod 1 is cleverly "hidden," making the relief valve more compact and smaller while maintaining its original adjustment function.

[0037] Going further:

[0038] 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.

[0039] 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 does 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 is an important component for regulating oil pressure and is closely matched 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 through its elastic deformation and close contact, it effectively blocks the gap between the two. 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.

[0040] Going further:

[0041] 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.

[0042] 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 must form an O-ring groove matching relationship, and the length must be long enough so that the sealing ring 6 and the second sealing ring 7 will not fall off during the pressure adjustment process.

[0043] Going further:

[0044] 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 .

[0045] 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.

[0046] Going further:

[0047] In an optional embodiment, the end surface of the large-diameter end of the adjusting rod 1 is a hexagonal groove.

[0048] In this embodiment: through this design, when the staff adjusts 1, the staff can insert the hexagonal wrench into the groove and rotate the hexagonal wrench to achieve adjustment, which is convenient for the staff to operate.

[0049] Going further:

[0050] 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 between the supporting protrusions 5 .

[0051] 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 support 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, allowing the oil to pass smoothly without generating additional pressure due to obstruction. At the same time, the gap between the support 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.

[0052] It should be noted that a locking nut is installed on the outer side wall of the regulating rod 1 , and the locking nut is in conflict with the surface of the valve body 2 .

[0053] The working principle and usage 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 value of the relief valve needs to be adjusted, the operator only needs to rotate the adjusting rod 1. The large diameter part of the adjusting rod 1 is connected to the valve body 2 by a thread, so rotating the adjusting rod can make it move into the valve body 2. The small diameter part of the adjusting rod 1 passes through the pressure reducing seat 4 and pushes the spring seat 8 to move. This movement process will cause the spring to compress, thereby changing the threshold value 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, 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 rotating 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.

[0054] The pressure reducing seat 4 introduces the 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 and there is back pressure at the T port or the pressure at the P port is too high, the oil enters the pressure reducing chamber from the pore structure a of the pressure reducing seat 4. At this time, the oil pressure on the pressure reducing seat 4 will be transmitted to the valve body 2 and blocked on the regulating rod 1. In addition, the oil pressure in the pressure reducing chamber will give the spring seat 8 a reverse force, so that after the relief valve is opened, the pressure area of ​​the regulating rod 1 is , and force value F1= , the adjusting rod 1 can be easily adjusted by simply overcoming the force value F1.

[0055] The length f on the decompression seat 4 ensures the size of 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 decompression seat 4 to ensure that the pressure on the decompression seat 4 will not be transmitted to the adjusting rod 1.

[0056] However, for the pressure reducing device with the pressure reducing seat 4 and the regulating rod 1, the length of the valve needs to be increased. It is suitable for large pressure regulating valves. The pressure bearing area of ​​the regulating rod 1 is , and force value F1= The diameter of the adjusting rod 1 is determined by its diameter φf, but φf cannot be too small to cause excessive stress and damage the adjusting rod 1. The aperture structure a of the pressure reducing seat 4 is designed to be variable, and the length b of the aperture structure a is also variable. To cope with different working conditions, the aperture structure a can increase the damping effect and thus reduce the whistling phenomenon.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are 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 will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An adjusting rod pressure reducing device, characterized in that: The invention comprises an adjusting rod (1), wherein the adjusting rod (1) is a stepped shaft structure, the large diameter of the adjusting rod (1) is provided with a thread and is threadedly connected to one end of the valve body (2), a pressure reducing seat (4) and a spring seat (8) are slidably connected in the valve body (2), the small diameter end of the adjusting rod (1) extends into the valve body (2), and the small 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 small diameter end of the adjusting rod (1) and the spring seat (8) are in conflict, and a supporting boss (5) is formed on a 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; Wherein, 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); Wherein, 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; A second sealing groove is provided on a side of the decompression 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); 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).

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

3. The regulating rod pressure reducing device according to claim 1, characterized in that: 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).

4. The regulating rod pressure reducing device according to claim 1, characterized in that: A locking nut is installed 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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