CN221683721U - Pressure-adjustable pressure relief valve - Google Patents

Abstract

The application relates to the technical field of valves, in particular to a pressure-adjustable relief valve which comprises a valve body, wherein an inner cavity for hydraulic oil to circulate is formed in the valve body, an oil inlet, a first oil outlet and an oil drain port which are communicated with the inner cavity are formed in the valve body, the oil inlet is positioned between the first oil outlet and the oil drain port, a valve seat is arranged in the inner cavity, a valve core is arranged on the valve seat, the valve core extends towards the direction far away from the oil inlet, and a pressure adjusting component is arranged at one end of the valve core far away from the oil inlet. The application has the effect of quickly adjusting the safety pressure value set by the pressure relief valve according to the actual working conditions of different hydraulic systems so as to improve the applicability of the pressure relief valve.

Description

A pressure-adjustable pressure relief valve

Technical Field

The present application relates to the field of valve technology, and in particular to a pressure-adjustable pressure relief valve.

Background Art

Pressure relief valves are also called safety valves. They can automatically open and close according to the working pressure of the system. They are usually installed on equipment or pipelines in closed systems to protect the safety of the system. Pressure relief valves are automatic valves, mainly used in boilers, pressure vessels and pipelines to control the internal pressure of pipelines or equipment not to exceed the specified value, which plays an important role in protecting personal safety and equipment operation.

A pressure relief valve recorded in the relevant technology usually sets a pressure relief value. This safety pressure value is often lower than the ultimate pressure value that the pipeline or equipment can withstand. When the pressure in the equipment or pipeline exceeds the pressure relief value set by the pressure relief valve, the pressure relief valve will automatically open to discharge the medium to achieve pressure relief, so as to ensure that the medium pressure value in the equipment and pipeline is lower than the ultimate pressure value that the pipeline or equipment can withstand, thereby protecting the equipment and pipeline and preventing accidents caused by excessive internal pressure of the pipeline or equipment; and when the medium pressure value in the equipment or pipeline drops to below the pressure relief value set by the pressure relief valve, the oil drain port of the pressure relief valve is closed, and the medium is no longer discharged to the outside.

Because the ultimate pressure value that a pipeline or equipment can withstand may change due to factors such as different hydraulic oils, usage time, temperature, etc., and different hydraulic systems can withstand different ultimate pressure values, but the pressure value that can be set by this pressure relief valve is fixed, and the pressure relief value set by the pressure relief valve cannot be adjusted according to actual conditions. In order to adapt to the different ultimate pressure values of the hydraulic system to ensure the safety of the hydraulic system, different pressure relief valves need to be replaced to meet work requirements, which will bring great inconvenience and make the applicability of this pressure relief valve poor.

Utility Model Content

In order to facilitate rapid adjustment of the pressure relief value set by the pressure relief valve according to the actual working conditions of different hydraulic systems to improve the applicability of the pressure relief valve, the present application provides a pressure-adjustable pressure relief valve.

The present application provides a pressure-adjustable pressure relief valve adopts the following technical solution:

A pressure-adjustable pressure relief valve comprises a valve body, an inner cavity for hydraulic oil to circulate is formed in the valve body, an oil inlet, a first oil outlet and an oil drain port which are connected to the inner cavity are formed on the valve body, the oil inlet is located between the first oil outlet and the oil drain port, a valve seat is arranged in the inner cavity, a valve core is arranged on the valve seat, the valve core extends in a direction away from the oil inlet, and a pressure regulating assembly is arranged at one end of the valve core away from the oil inlet.

By adopting the above technical solution, the pressure relief value of the pressure relief valve is adjusted by using the pressure regulating component. In the working state, the hydraulic oil flows in from the oil inlet and then flows out from the first oil outlet. When the pressure at the first oil outlet continues to increase, the hydraulic oil will apply pressure to the valve core, causing the valve core to move away from the oil inlet. As the pressure continues to increase, the valve core continues to move until the oil inlet is connected to the oil drain port to achieve pressure relief. In this way, by setting the pressure regulating component, the pressure value required to push the valve core to move can be controlled, so that the pressure relief value set by the pressure relief valve can be quickly adjusted according to the actual working conditions of different hydraulic systems to improve the applicability of the pressure relief valve.

Optionally, the pressure regulating assembly includes an adjusting seat arranged on the valve body, an adjusting shaft is passed through the adjusting seat, a locking nut is threadedly connected to the end of the adjusting shaft away from the valve core, a pressure spring is connected between the end of the adjusting shaft close to the valve core and the valve core, and two clamping screws for fixing the adjusting seat are passed through the valve body, and the two clamping screws are symmetrical about the axis of the adjusting shaft.

By adopting the above technical solution, the position of the adjusting shaft can be changed by screwing the locking nut, thereby changing the abutment force of the adjusting shaft on the pressure spring. According to the working condition of the hydraulic system, the appropriate pressure relief value is determined, the locking nut is adjusted, the abutment force of the adjusting shaft on the pressure spring is changed, and the clamping screw is screwed at the same time to move the two sides of the adjusting seat toward each other. At this time, the adjusting seat can clamp the adjusting shaft to ensure that the adjusting shaft will not move due to force during the process of the valve core compressing the pressure spring.

Optionally, a sealing ring for sealing is sleeved on the adjusting shaft.

By adopting the above technical solution, when the adjusting seat is clamped, the circumferential surface of the sealing ring can abut against the adjusting seat, thereby ensuring that during the operation of the pressure relief valve, the hydraulic pressure will not leak through the adjusting shaft. At the same time, the sealing ring can increase the friction resistance between the adjusting seat, so that during the operation of the pressure relief valve, the abutment relationship between the adjusting shaft and the adjusting seat is more stable.

Optionally, a safety cap for shielding the adjusting shaft and the locking nut is detachably connected to the valve body.

By adopting the above technical solution, there is a cavity between the safety cap and the adjustment seat, and the locking nut and the part of the adjustment shaft extending out of the adjustment seat are both located in the above cavity. By providing the safety cap, the locking nut and the adjustment shaft can be protected.

Optionally, a check valve for preventing backflow of hydraulic oil is provided between the oil inlet and the first oil outlet.

By adopting the above technical solution, the check valve can only allow the hydraulic oil to flow from the oil inlet to the first oil outlet. When the pressure at the first oil outlet is too high, the check valve can prevent the hydraulic oil from flowing back.

Optionally, a threaded cartridge valve is provided on the valve body, and the threaded cartridge valve is located at an end of the valve core away from the oil inlet. A pilot control device for controlling the connection or closing of the oil drain port is provided on the threaded cartridge valve. A control line is opened on the valve body, and the valve core is opened with an oil hole for connecting the control line with the pilot control device. One end of the control line is connected to the check valve, and the other end of the control line is connected to the oil hole.

By adopting the above technical solution and setting a threaded cartridge valve and a pilot control device, the pressure relief speed of the pressure relief valve can be further improved, so that the pressure inside the pipeline or equipment can be quickly reduced, thereby improving the safety and stability inside the pipeline or equipment.

Optionally, a piston is provided on the valve seat, and the piston is located at one end of the valve core close to the oil inlet. A compression spring is connected between the piston and the valve core. The piston is provided with a connecting hole for hydraulic oil to pass through. The valve body is provided with a second oil outlet connected to the inner cavity, and the second oil outlet is located between the oil inlet and the oil drain port.

By adopting the above technical solution, when the hydraulic oil pushes the valve core to move, the valve core also drives the piston to move, and the oil inlet can be directly connected to the second oil outlet, further accelerating the pressure relief speed, and the second oil outlet is connected to the oil tank, which is convenient for collecting and reusing the hydraulic oil.

Optionally, sealing rings are provided on the oil inlet, the first oil outlet, the second oil outlet and the oil drain port.

By adopting the above technical solution, the sealing ring can increase the sealing performance when the oil inlet, the first oil outlet, the second oil outlet and the oil drain port are connected to the external pipeline, thereby reducing the possibility of leakage of hydraulic oil.

Optionally, a protective shell is provided on the outside of the valve body.

By adopting the above technical solution, the protective shell can protect the valve body and the internal structure, so as to increase the service life of the pressure relief valve.

In summary, the present application includes at least one of the following beneficial technical effects:

The present application is provided with a locking nut, a pressure spring, an adjusting seat and an adjusting shaft. The locking nut is threadedly connected to the adjusting shaft, the adjusting shaft is slidably connected to the adjusting seat, and the pressure spring is respectively connected to the adjusting shaft and the valve core. By screwing the locking nut, the tightness between the adjusting seat and the adjusting shaft is changed to adjust the abutment force of the spring. The difference in the abutment force of the spring is utilized to change the pressure value of the pressure relief valve when releasing pressure. In this way, the pressure relief value set by the pressure relief valve can be quickly adjusted according to the actual working conditions, thereby ensuring the safety of the entire hydraulic system and improving the applicability of the pressure relief valve.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of the pressure-adjustable pressure relief valve in this embodiment.

Explanation of the accompanying drawings: 1. Valve body; 101. Inner cavity; 2. Oil inlet; 3. First oil outlet; 4. Oil drain; 5. Second oil outlet; 6. Valve seat; 7. Piston; 8. Pressure regulating assembly; 801. Adjusting shaft; 802. Locking nut; 803. Adjusting seat; 804. Pressure spring; 805. Clamping screw; 9. Sealing ring; 10. Safety cap; 11. Valve core; 12. Compression spring; 13. Control line; 14. Oil hole; 15. Sealing ring; 16. Connecting hole; 17. Check valve; 18. Threaded cartridge valve.

DETAILED DESCRIPTION

The present application is further described in detail below in conjunction with FIG1 .

An embodiment of the present application discloses a pressure-adjustable pressure relief valve. Referring to Figure 1, the pressure-adjustable pressure relief valve includes a valve body 1. An inner cavity 101 is formed inside the valve body 1 for hydraulic oil to flow. An oil inlet 2, a first oil outlet 3 and an oil drain 4 connected to the inner cavity 101 are formed on the valve body 1. The oil inlet 2 is located between the first oil outlet 3 and the oil drain 4. A valve seat 6 is installed in the inner cavity 101. The valve seat 6 is located on the side of the oil inlet 2 away from the first oil outlet 3. A valve core 11 is slidably connected to the valve seat 6. The valve core 11 extends in a direction away from the first oil outlet 3. A pressure regulating assembly 8 is provided at the end of the valve core 11 away from the oil inlet 2.

The first oil outlet 3 is connected to the external accumulator, and the pressure relief value of the pressure relief valve is adjusted by the pressure regulating component 8. In the working state, the hydraulic oil flows in from the oil inlet 2 and then flows out from the first oil outlet 3. At this time, the oil relief port 4 and the oil inlet 2 will not be connected due to the blocking effect of the valve core 11. When the pressure at the first oil outlet 3 continues to increase, the hydraulic oil will apply pressure to the valve core 11, so that the valve core 11 moves away from the oil inlet 2. As the pressure continues to increase, until the pressure value is greater than the abutment force provided by the pressure regulating component 8, the valve core 11 will move away from the oil inlet 2, and the oil inlet 2 is connected to the oil relief port 4 to achieve pressure relief. In this way, by setting the pressure regulating component 8, the pressure value required to push the valve core 11 to move can be controlled, so that the pressure relief value set by the pressure relief valve can be quickly adjusted according to the actual working conditions of different hydraulic systems to improve the applicability of the pressure relief valve.

Specifically, referring to FIG. 1 , the pressure regulating assembly 8 includes an adjusting seat 803 installed on the valve body 1, the adjusting seat 803 is located at the end of the valve core 11 away from the oil inlet 2, an adjusting shaft 801 is passed through the adjusting seat 803, a pressure spring 804 is connected between the adjusting shaft 801 and the valve core 11, a locking nut 802 is threadedly connected to the end of the adjusting shaft 801 away from the pressure spring 804, a clamping screw 805 is passed through the circumferential surface of the valve body 1, and the clamping screw 805 is threadedly connected to the adjusting seat 803. In this embodiment, two clamping screws 805 are provided, and the two clamping screws 805 are symmetrically arranged along the axis of the adjusting shaft 801.

By screwing the locking nut 802, the position of the adjusting shaft 801 can be changed. When the adjusting shaft 801 moves in the direction away from the valve core 11, the abutting force of the adjusting shaft 801 on the pressure spring 804 decreases, so that the pressure relief value of the pressure relief valve decreases. When the adjusting shaft 801 moves in the direction close to the valve core 11, the abutting force of the adjusting shaft 801 on the pressure spring 804 increases, so that the pressure relief value of the pressure relief valve increases. According to the working condition of the hydraulic system, the appropriate pressure relief value is determined, the locking nut 802 is adjusted to change the abutting force of the adjusting shaft 801 on the pressure spring 804, and the clamping screw 805 is screwed at the same time to make the two sides of the adjusting seat 803 move towards each other. At this time, the adjusting seat 803 can clamp the adjusting shaft 801 to ensure that the adjusting shaft 801 will not move due to force during the process of the valve core 11 compressing the pressure spring 804.

A sealing ring 9 is sleeved on the adjusting shaft 801. When the adjusting seat 803 is clamped, the circumferential surface of the sealing ring 9 can abut against the adjusting seat 803, thereby ensuring that during the operation of the pressure relief valve, the hydraulic pressure will not leak out through the adjusting shaft 801. At the same time, the sealing ring 9 can increase the friction resistance between the adjusting seat 803, so that during the operation of the pressure relief valve, the abutting relationship between the adjusting shaft 801 and the adjusting seat 803 is more stable. A safety cap 10 is detachably connected to the end of the adjusting seat 803 away from the valve core 11. There is a cavity between the safety cap 10 and the adjusting seat 803. The locking nut 802 and the part of the adjusting shaft 801 extending out of the adjusting seat 803 are both located in the above-mentioned cavity. By providing the safety cap 10, a safety protection effect can be played on the locking nut 802 and the adjusting shaft 801.

1 , a check valve 17 is installed between the oil inlet 2 and the first oil outlet 3. The check valve 17 only allows the hydraulic oil to flow from the oil inlet 2 to the first oil outlet 3. When the pressure at the first oil outlet 3 is too high, the check valve 17 can prevent the hydraulic oil from flowing back.

A threaded cartridge valve 18 for controlling the on or off of the control line 13 is arranged between the valve core 11 and the adjusting shaft 801. The oil outlet of the threaded cartridge valve 18 is connected to the oil drain port 4. A pilot control device (not shown in the figure) is arranged on the threaded cartridge valve 18. The valve body 1 is provided with a control line 13. The valve core 11 is provided with an oil hole 14. One end of the control line 13 is connected to the check valve 17, and the other end of the control line 13 is connected to the oil hole 14.

When the pressure of the first oil outlet 3 increases continuously, the check valve 17 prevents the hydraulic oil at the oil inlet 2 from entering the first oil outlet 3. The hydraulic oil at the first oil outlet 3 acts on the pilot control device of the threaded cartridge valve 18 through the check valve, the control line 13, the oil hole 14, and the valve core 11 in sequence. The pilot control device controls the oil drain port 4 to communicate with the threaded cartridge valve 18. At this time, a pressure drop is formed between the oil inlet 2 and the oil drain port 4, that is, the pressure at the oil inlet 2 is greater than the pressure at the oil drain port 4. The valve core 11 moves toward the direction close to the threaded cartridge valve 18 under the action of the pressure difference. As the valve core 11 moves until the pressure relief value set in the pressure relief valve is reached, the oil inlet 2 is connected to the oil drain port 4 to achieve pressure relief. By setting the threaded cartridge valve 18 and the pilot control device, the pressure relief speed of the pressure relief valve can be further improved, so that the pressure inside the pipeline or equipment can be quickly reduced, and the safety and stability inside the pipeline or equipment can be improved.

Referring to Figure 1, a piston 7 is also installed on the valve seat 6. The piston 7 displaces the valve core 11 to the side close to the check valve 17. A compression spring 12 is connected between the piston 7 and the valve core 11. A connecting hole 16 is provided on the piston 7 to ensure that the hydraulic oil can pass through the piston 7 and act on the valve core 11. A second oil outlet 5 connected to the inner cavity 101 is provided between the oil drain port 4 and the oil inlet 2. The second oil outlet 5 is connected to the oil tank. When the hydraulic oil pushes the valve core 11 to move, the valve core 11 also drives the piston 7 to move, and the oil inlet 2 can be directly connected to the second oil outlet 5, further accelerating the pressure relief speed. In addition, the second oil outlet 5 is connected to the oil tank, which is convenient for collecting and reusing the hydraulic oil.

As the pressure at the first oil outlet 3 continues to decrease until it returns to a safe range, the pilot control device returns to its original state and controls the oil outlet of the threaded cartridge valve 18 to be closed. At this time, the pressure on one side of the valve core 11 is greater than the pressure on the oil inlet 2, and the valve core 11 moves toward the oil inlet 2. At the same time, under the action of the compression spring 12, the piston 7 also moves toward the oil inlet 2 until the piston 7 blocks the second oil outlet 5. At this time, the hydraulic oil flows in from the oil inlet 2 and flows out from the first oil outlet 3 through the check valve 17.

The oil inlet 2, the first oil outlet 3, the second oil outlet 5 and the oil drain 4 are all equipped with sealing rings 15 to improve the sealing performance when the oil inlet 2, the first oil outlet 3, the second oil outlet 5 and the oil drain 4 are connected to the external pipeline. A protective shell (not shown in the figure) is also sleeved on the valve body 1, which can protect the valve body 1 and the internal structure to increase the service life of the pressure relief valve.

The implementation principle of a pressure-adjustable pressure relief valve in the embodiment of the present application is as follows: when in use, first adjust the locking nut 802 to determine the appropriate pressure relief value according to the pressure condition of the hydraulic system, and fix the adjusting shaft 801 by the clamping screw 805. When the pressure at the first oil outlet 3 is too high, the hydraulic oil will act on the pilot control device of the threaded cartridge valve 18 through the control line 13 and the oil hole 14. Under the action of the pilot control device, the oil drain port 4 is connected with one side of the valve core 11, and the hydraulic oil can flow out from the oil drain port 4 to achieve pressure relief. At the same time, under the action of the pressure difference, the valve core 11 moves in the direction close to the oil drain port 4, and at the same time drives the piston 7 to move, so that the second oil outlet 5 is connected with the oil inlet 2, thereby achieving further pressure relief. In this way, by setting the locking nut 802, the adjusting shaft 801, the adjusting seat 803, the pressure spring 804 and the clamping screw 805, the pressure value required to push the valve core 11 to move can be controlled. In this way, the pressure relief value set by the pressure relief valve can be quickly adjusted according to the actual working conditions of different hydraulic systems to improve the applicability of the pressure relief valve.

The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims (9)

1. A pressure-adjustable pressure relief valve, characterized in that it comprises a valve body (1), wherein an inner cavity (101) is formed in the valve body (1) for circulating hydraulic oil, an oil inlet (2), a first oil outlet (3) and an oil drain (4) which are connected to the inner cavity (101) are formed on the valve body (1), the oil inlet (2) is located between the first oil outlet (3) and the oil drain (4), a valve seat (6) is arranged in the inner cavity (101), a valve core (11) is arranged on the valve seat (6), the valve core (11) extends in a direction away from the oil inlet (2), and a pressure regulating component (8) is arranged at one end of the valve core (11) away from the oil inlet (2). 2. The pressure-adjustable pressure relief valve according to claim 1 is characterized in that: the pressure regulating assembly (8) includes an adjusting seat (803) arranged on the valve body (1), an adjusting shaft (801) is passed through the adjusting seat (803), a locking nut (802) is threadedly connected to the end of the adjusting shaft (801) away from the valve core (11), a pressure spring (804) is connected between the end of the adjusting shaft (801) close to the valve core (11) and the valve core (11), and two clamping screws (805) for fixing the adjusting seat (803) are passed through the valve body (1), and the two clamping screws (805) are symmetrical about the axis of the adjusting shaft (801). 3. The pressure-adjustable pressure relief valve according to claim 2, characterized in that a sealing ring (9) for sealing is sleeved on the adjusting shaft (801). 4. The pressure-adjustable pressure relief valve according to claim 2 is characterized in that a safety cap (10) for shielding the adjusting shaft (801) and the locking nut (802) is detachably connected to the valve body (1). 5. The pressure-adjustable pressure relief valve according to claim 1, characterized in that a check valve (17) is provided between the oil inlet (2) and the first oil outlet (3) for preventing hydraulic oil from flowing back. 6. The pressure-adjustable pressure relief valve according to claim 5, characterized in that: a threaded cartridge valve (18) is provided on the valve body (1), the threaded cartridge valve (18) is located at the end of the valve core (11) away from the oil inlet (2), the threaded cartridge valve (18) is provided with a pilot control device for controlling the connection or closing of the oil drain port (4), a control pipeline (13) is provided on the valve body (1), the valve core (11) is provided with an oil hole (14) for connecting the control pipeline (13) with the pilot control device, one end of the control pipeline (13) is connected to the check valve (17), and the other end of the control pipeline (13) is connected to the oil hole (14). 7. The pressure-adjustable pressure relief valve according to claim 1 is characterized in that: a piston (7) is arranged on the valve seat (6), the piston (7) is located at one end of the valve core (11) close to the oil inlet (2), a compression spring (12) is connected between the piston (7) and the valve core (11), a connecting hole (16) for hydraulic oil to pass through is provided on the piston (7), a second oil outlet (5) connected to the inner cavity (101) is provided on the valve body (1), and the second oil outlet (5) is located between the oil inlet (2) and the oil drain port (4). 8. The pressure-adjustable pressure relief valve according to claim 7, characterized in that sealing rings (15) are provided on the oil inlet (2), the first oil outlet (3), the second oil outlet (5) and the oil drain port (4). 9. The pressure-adjustable pressure relief valve according to claim 1, characterized in that a protective shell is provided on the outside of the valve body (1).