Electric proportional overflow valve with manual function

Abstract

The utility model relates to an electric proportional overflow valve with a manual function, which is characterized in that a coil is sleeved outside a flux sleeve, a moving iron is positioned in the flux sleeve, a valve sleeve is connected to the right end of the flux sleeve, the right end of the valve sleeve is provided with a liquid inlet, the side wall of the valve sleeve is provided with an overflow port, a valve core is movably matched in the valve sleeve and is used for sealing the overflow port, and a pressure guide hole penetrates through the middle part of the valve core. A base is fixed to the left end of the valve sleeve, a first elastic mechanism is arranged between the base and the valve element, a pilot opening is formed in the base, the pilot valve element is located between the moving iron and the base and used for blocking the pilot opening, a gap opening is formed between the flux sleeve and the valve sleeve, and the left end of the pilot valve element is fixedly connected with a push rod movably matched in the moving iron. The middle of the push rod is fixedly connected with a push plate, the pressure regulating rod is in threaded connection with the left end of the flux sleeve, a first spring is arranged between the push plate and the pressure regulating rod, and a second spring is arranged between the push plate and the moving iron.

Description

Technical Field

[0001] This utility model relates to the field of flow control device technology, and in particular to an electro-proportional relief valve with manual function. Background Technology

[0002] Hydraulic systems are widely used in numerous industrial fields, such as construction machinery, machine tools, and aerospace. Pressure control is crucial in hydraulic systems, directly affecting their safety, stability, and efficiency. As a key pressure control component in hydraulic systems, the performance of the relief valve has a significant impact on the entire hydraulic system.

[0003] Traditional mechanical relief valves rely primarily on the preload of a spring for their opening pressure, which remains essentially fixed once the spring is installed. This type of fixed-pressure relief valve is poorly adaptable to hydraulic systems with varying operating conditions. Other types, such as the relief valve described in patent application CN202322424712.3, are manually operated, adjusting the spring compression to change the opening pressure. However, manual adjustment is inconvenient and lacks precision. Furthermore, while some electro-hydraulic proportional relief valves offer some flexibility in pressure control via electrical signals, they largely rely on electric control. When the electrical control system malfunctions, manual intervention to adjust the pressure is impossible or difficult, requiring complex switching processes. This can lead to hydraulic system shutdowns due to uncontrolled pressure, resulting in production interruptions and other losses.

[0004] With the development of industrial automation and intelligence, hydraulic systems place higher demands on pressure control components. Hydraulic equipment needs to accurately and stably control pressure under different operating conditions, and the control components must possess high reliability and operational flexibility. Especially in some critical equipment, such as high-precision CNC machine tools and large-scale aerospace ground simulation equipment, there is an urgent need for a relief valve structure that can achieve high-precision pressure regulation through electrical signal control and also allows for reliable manual operation under special circumstances, in order to meet the complex and ever-changing needs of industrial production. Therefore, this application addresses the aforementioned technical problems by making improvements. Utility Model Content

[0005] This invention proposes an electro-proportional relief valve with manual function, which solves the above-mentioned problems existing in the use of the prior art.

[0006] The technical solution of this utility model is implemented as follows: An electro-proportional relief valve with manual function includes a coil, a magnetic sleeve, a moving iron, a pilot valve core, a pressure adjusting rod, a valve sleeve, and a valve core. The coil is fixedly sleeved outside the magnetic sleeve, the moving iron is movably fitted inside the magnetic sleeve, the valve sleeve is fixedly connected to the right end of the magnetic sleeve, the right end of the valve sleeve has an inlet port, the side wall of the valve sleeve has an overflow port, the valve core is movably fitted inside the valve sleeve and is used to seal the overflow port, the valve core has a pressure-guiding hole through its middle, and the left end of the valve sleeve is fixedly... A base is placed inside a magnetic sleeve. A first elastic mechanism for pushing the valve core to the right is provided between the base and the valve core. A pilot port is opened on the base. The pilot valve core is located between the moving iron and the base and is used to block the pilot port. A gap is formed between the magnetic sleeve and the valve sleeve. A push rod that is movably fitted in the moving iron is fixedly connected to the left end of the pilot valve core. A push plate is fixedly connected to the middle of the push rod. The pressure adjusting rod is threaded to the left end of the magnetic sleeve. A first spring is provided between the push plate and the pressure adjusting rod. A second spring is provided between the push plate and the moving iron.

[0007] Preferably, a filter screen is fixedly installed on the pressure inlet of the valve core.

[0008] Preferably, the valve core has a filter screen opening and a retaining ring groove on the right side of the pressure inlet. The filter screen is located inside the filter screen opening, a retaining ring is provided in the retaining ring groove, and a gasket is provided between the edge of the filter screen and the retaining ring.

[0009] Preferably, the first elastic mechanism includes a third spring and a spring seat, the spring seat abutting against the base, the spring seat having a flow hole communicating with the pilot port, and the two ends of the third spring abutting between the spring seat and the valve core.

[0010] Preferably, the left end of the moving iron is provided with a spring slot, the push plate is located in the spring slot, the moving iron is provided with a washer in the spring slot, and the second spring is located in the spring slot and abuts against the push plate and the washer.

[0011] Preferably, the magnetic sleeve is provided with a limiting sleeve located between the moving iron and the base, and a liquid outlet groove is provided between the base and the limiting sleeve.

[0012] Preferably, the moving iron has a through hole, the pressure regulating rod has a safety relief hole, the side wall of the pressure regulating rod near the left end has an outlet that communicates with the safety relief hole, the safety relief hole has a steel ball for sealing it, and the pressure regulating rod has a screw for holding and fixing the steel ball.

[0013] In summary, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model achieves electro-proportional control through components such as coils, magnetic sleeves, and moving iron. It can precisely adjust the movement of the pilot valve core according to electrical signals, thereby controlling the opening pressure of the relief valve to adapt to pressure requirements under different working conditions, improving the flexibility and accuracy of system pressure control. Simultaneously, the included manual adjustment components, such as the pressure adjusting rod, allow manual adjustment of the spring preload in case of electrical faults or special circumstances, ensuring the relief valve continues to operate normally, enhancing the equipment's reliability and emergency handling capabilities. The coordinated design of the valve sleeve and valve core ensures effective sealing and timely opening of the pressure relief port during normal operation, maintaining stable system pressure and achieving the relief function.

[0015] 2. A filter screen is installed in the pressure tapping hole of the valve core to effectively filter impurities in the hydraulic oil. This prevents impurities from entering critical components inside the valve, such as the pilot valve core and the clearance between the moving iron and the magnetic sleeve, reducing wear and jamming, extending the service life of the relief valve, improving its reliability and stability, and ensuring the accuracy of system pressure control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partially enlarged schematic diagram of the right-end valve sleeve portion of this utility model.

[0019] In the diagram: 11. Coil; 12. Magnetic sleeve; 121. Gap opening; 21. Moving iron; 211. Spring groove; 212. Safety through hole; 22. Washer; 31. Pilot valve core; 32. Push rod; 33. Push plate; 41. Pressure adjusting rod; 411. Safety pressure relief hole; 412. Discharge port; 42. Steel ball; 43. Screw; 50. Valve sleeve; 51. Liquid inlet; 52. Overflow port; 61. Valve core; 611. Pressure tapping hole; 612. Filter screen opening; 62. Retaining ring groove; 63. Retaining ring; 64. Gasket; 65. Filter screen; 71. Base; 711. Pilot port; 712. Liquid outlet groove; 81. First spring; 82. Second spring; 83. Third spring; 84. Spring seat; 85. Flow passage hole; 9. Limiting sleeve. Detailed Implementation

[0020] The following will refer to the appendix in the embodiments of this utility model. Figure 1 Appendix Figure 2The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example:

[0022] like Figure 1 and Figure 2 As shown, this utility model discloses an electro-proportional relief valve with manual function, including a coil 11, a magnetic sleeve 12, a moving iron 21, a pilot valve core 31, a pressure regulating rod 41, a valve sleeve 50, and a valve core 61. The coil 11 is fixedly sleeved outside the magnetic sleeve 12, the moving iron 21 is movably fitted inside the magnetic sleeve 12, and the valve sleeve 50 is fixedly connected to the right end of the magnetic sleeve 12. An inlet 51 is provided at the right end of the valve sleeve 50, and an overflow port 52 is provided on the side wall of the valve sleeve 50. The valve core 61 is movably fitted inside the valve sleeve 50 and is used to seal the overflow port 52. It should be noted that, as Figure 2 As shown, at least two overflow ports 52 are provided, and their positions differ on the left and right sides. This enables graded pressure control, adapts to different flow requirements, increases system safety and reliability, and reduces unnecessary energy loss. A pressure-guiding hole 611 is provided through the middle of the valve core 61. In addition, a base 71 located inside the magnetic sleeve 12 is fixedly provided at the left end of the valve sleeve 50. A pilot port 711 is provided on the base 71. A first elastic mechanism for pushing the valve core 61 to the right is provided between the base 71 and the valve core 61. Specifically, the first elastic mechanism includes a third spring 83 and a spring seat 84. The spring seat 84 abuts against the base 71 and has a flow hole 85 communicating with the pilot port 711. The two ends of the third spring 83 abut against the spring seat 84 and the valve core 61. The valve core 61 is closed to the overflow port 52 by the action of the third spring 83. When the valve core 61 is pushed and compressed by the third spring 83 to move to the left, the overflow port 52 can be opened. In addition, this utility model also has a pilot valve core 31, which is located between the moving iron 21 and the base 71 and is used to block the pilot port 711. A gap 121 is formed between the magnetic sleeve 12 and the valve sleeve 50 to allow the cavity at the left end of the base 71 to open to the outside of the valve sleeve 50. A push rod 32 is fixedly connected to the left end of the pilot valve core 31 and is movably fitted in the moving iron 21. A push plate 33 is fixedly connected to the middle of the push rod 32, and a pressure regulating rod 41 is threaded to the left end of the magnetic sleeve 12. A first spring 81 is provided between the push plate 33 and the pressure regulating rod 41, and a second spring 82 is provided between the push plate 33 and the moving iron 21.

[0023] When this utility model is in operation, the medium enters from the inlet 51 at the right end of the valve sleeve 50, and enters the left end of the valve core 61 through the pressure hole 611 in the middle of the valve core 61. Then, it enters the pilot port 711 of the base 71 through the flow hole 85 of the spring seat 84, putting pressure on the pilot valve core 31. When the pressure of the medium on the pilot valve core 31, combined with the pressure of the second spring 82, can overcome the pressure of the first spring 81 on the push plate 33, the pilot valve core 31 can be forced to move to the left. At this time, the medium enters the left side of the base 71 and leaves through the gap 121 between the magnetic sleeve 12 and the valve sleeve 50. At this time, a pressure difference is generated between the left and right end faces of the valve core 61. This pressure difference generates a force that overcomes the force of the third spring 83, forcing the valve core 61 to move to the left, thereby realizing the flow of the medium from the inlet 51 to the overflow port 52, achieving the effect of limiting the pressure from rising further.

[0024] In the case of electro-proportional control mode, when the system pressure rises to a certain level, the current flowing through coil 11 increases, generating an electromagnetic force that attracts moving iron 21 to move to the left. Moving iron 21 compresses the second spring 82, pushing push plate 33 to compress the first spring 81. At this time, push rod 32 drives pilot valve core 31 to move to the left, pilot port 711 opens, and some oil flows out through pilot port 711 and gap port 121. The internal pressure of valve sleeve 50 decreases, and a pressure difference is generated on the left and right sides of valve core 61. Under the action of the pressure difference, valve core 61 moves to the right, overflow port 52 opens, and excess oil flows out from overflow port 52 to achieve overflow. By adjusting the current of coil 11, the opening degree of pilot valve core 31 can be precisely controlled, thereby adjusting the overflow pressure. In manual adjustment mode, rotating the pressure regulating lever 41 changes the preload of the first spring 81. When the force of the system pressure acting on the pilot valve core 31 combined with the force of the second spring 82 is greater than the preload of the first spring 81, the pilot valve core 31 opens, and the subsequent overflow process is the same as in the electro-proportional control mode.

[0025] Furthermore, a filter screen 65 is fixedly installed on the pressure inlet 611 of the valve core 61. The filter screen 65 can effectively filter impurity particles in the hydraulic oil. This prevents impurities from entering key components inside the valve, such as the pilot valve core 31, the mating clearance 121 between the moving iron 21 and the magnetic sleeve 12, etc., reducing wear and jamming, extending the service life of the relief valve, improving its operational reliability and stability, and ensuring the accuracy of system pressure control.

[0026] The specific structure of the filter screen 65 fixed on the valve core 61 is as follows: the valve core 61 has a filter screen opening 612 and a retaining ring groove 62 on the right side of the pressure inlet 611. The filter screen 65 is located in the filter screen opening 612, and a retaining ring 63 is provided in the retaining ring groove 62. A gasket 64 is provided between the edge of the filter screen and the retaining ring 63. This structure ensures that the filter screen 65 is firmly installed and has a good seal. The retaining ring 63 prevents the filter screen 65 from falling out under hydraulic shock or other conditions, and the gasket 64 ensures the seal between the filter screen and the filter screen opening 612.

[0027] In this utility model, a spring slot 211 is provided at the left end of the moving iron 21. The push plate 33 is located in the spring slot 211, and a washer 22 is provided in the spring slot 211 of the moving iron 21. The second spring 82 is located in the spring slot 211 and abuts against the push plate 33 and the washer 22. A part of the right end of the first spring 81 is also located in the spring slot 211. The above structure is conducive to making the force on the push plate 33 more uniform when it moves axially, which helps to stably transmit force and ensure the smoothness and reliability of the pilot valve core 31 in the process of electro-proportional control or manual adjustment, thereby accurately controlling the pressure regulation process of the relief valve.

[0028] In this utility model, a limiting sleeve 9 is provided inside the magnetic sleeve 12 between the moving iron 21 and the base 71. A liquid outlet groove 712 is provided between the base 71 and the limiting sleeve 9. The left end of the limiting sleeve 9 is used to limit the range of movement of the moving iron 21 to the right, and the right end of the limiting sleeve 9 abuts against the base 71, so that the base 71 is clamped between the limiting sleeve 9 and the valve sleeve 50.

[0029] In this utility model, a safety through hole 212 is provided through the moving iron 21, and a safety pressure relief hole 411 is provided on the pressure regulating rod 41. An outlet 412 connected to the safety pressure relief hole 411 is provided on the side wall of the pressure regulating rod 41 near the left end. A steel ball 42 is provided in the safety pressure relief hole 411 for sealing it. A screw 43 for holding and fixing the steel ball 42 is internally threaded to the pressure regulating rod 41. When the system pressure rises abnormally and exceeds the safety setting value, it may be due to the gap 121 or overflow port 52 being blocked, or other reasons. The user can turn the screw 43 to loosen the steel ball 42. The steel ball 42 moves to the left under the action of the high pressure medium, so that the high pressure medium is released through the safety through hole 212, the safety pressure relief hole 411 and the outlet 412, preventing the internal pressure of the overflow valve from being too high and damaging the components. This plays the role of overpressure protection and improves the safety of the overflow valve under extreme working conditions.

[0030] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electro-proportional relief valve with manual function, characterized in that: The device includes a coil, a magnetic sleeve, a moving iron, a pilot valve core, a pressure regulating rod, a valve sleeve, and a valve core. The coil is fixedly sleeved outside the magnetic sleeve, and the moving iron is movably fitted inside the magnetic sleeve. The valve sleeve is fixedly connected to the right end of the magnetic sleeve, and has an inlet at the right end. An overflow port is provided on the side wall of the valve sleeve. The valve core is movably fitted inside the valve sleeve and seals the overflow port. A pressure-feeding hole is formed through the center of the valve core. A base is fixedly mounted inside the magnetic sleeve at the left end of the valve sleeve. A first elastic mechanism for pushing the valve core to the right is provided between the valve core and the base. A pilot port is provided on the base. The pilot valve core is located between the moving iron and the base and is used to block the pilot port. A gap is formed between the magnetic sleeve and the valve sleeve. A push rod that is movably fitted in the moving iron is fixedly connected to the left end of the pilot valve core. A push plate is fixedly connected to the middle of the push rod. The pressure adjusting rod is threaded to the left end of the magnetic sleeve. A first spring is provided between the push plate and the pressure adjusting rod. A second spring is provided between the push plate and the moving iron.

2. The electro-proportional relief valve with manual function according to claim 1, characterized in that: A filter screen is fixedly installed on the pressure-feeding hole of the valve core.

3. The electro-proportional relief valve with manual function according to claim 2, characterized in that: The valve core has a filter screen opening and a retaining ring groove on the right side of the pressure inlet. The filter screen is located inside the filter screen opening, and a retaining ring is provided in the retaining ring groove. A gasket is provided between the edge of the filter screen and the retaining ring.

4. The electro-proportional relief valve with manual function according to claim 1, characterized in that: The first elastic mechanism includes a third spring and a spring seat. The spring seat abuts against the base and has a flow hole communicating with the pilot port. The two ends of the third spring abut against the spring seat and the valve core.

5. The electro-proportional relief valve with manual function according to claim 1, characterized in that: The left end of the moving iron is provided with a spring slot, the push plate is located in the spring slot, the moving iron is provided with a washer in the spring slot, and the second spring is located in the spring slot and abuts against the push plate and the washer.

6. The electro-proportional relief valve with manual function according to claim 1, characterized in that: The magnetic sleeve is provided with a limiting sleeve located between the moving iron and the base, and a liquid outlet groove is provided between the base and the limiting sleeve.

7. The electro-proportional relief valve with manual function according to claim 1, characterized in that: A safety through hole is provided on the moving iron, a safety pressure relief hole is provided on the pressure adjusting rod, and an outlet connected to the safety pressure relief hole is provided on the side wall of the pressure adjusting rod near the left end. A steel ball is provided in the safety pressure relief hole for sealing it, and a screw is provided in the pressure adjusting rod for supporting and fixing the steel ball.

Images