Direct-acting overload oil compensation valve

Abstract

The present application relates to a kind of direct-acting overload oil supplement valve, including upper valve sleeve, overflow valve reset spring, ball valve seat, ball core, valve seat, valve core, stabilizing spring, disc-shaped valve core, spring seat, one-way valve reset spring and lower valve sleeve, upper valve sleeve, lower valve sleeve and valve seat are interference fit, lower valve sleeve is equipped with oil port I, upper valve sleeve is equipped with oil port II, overflow valve reset spring, ball valve seat and ball core are in the upper valve sleeve, the valve core, stabilizing spring, disc-shaped valve core, spring seat and one-way valve reset spring are in the lower valve sleeve, overflow valve reset spring is located between upper valve sleeve and ball valve seat, the bottom of ball valve seat is connected with ball core, ball core is connected with valve seat and valve core, stabilizing spring is located between valve core and lower valve sleeve, one-way valve reset spring is located between spring seat and lower valve sleeve, disc-shaped valve core is arranged above spring seat.The present application simplifies oil supplement mechanism, and the volume is small, compact structure, response is fast, internal leakage is small, application is flexible, and installation and maintenance are simple.

Description

Technical Field

[0001] This invention relates to a direct-acting overload replenishing valve, belonging to the technical field of overload replenishing valves. Background Technology

[0002] Overload relief valves are commonly used pressure control components in load-sensitive multi-way valves to protect the actuators. Their main function is to protect the hydraulic actuators, ensuring they operate within the set pressure of the overload protection valve. When the actuator's oil circuit exceeds the set pressure, excess oil can return to the oil tank through the overload valve. Alternatively, when negative pressure suction occurs in the actuator's oil circuit, the overload relief valve replenishes oil, preventing noise, impact, and vibration during actuator operation, thereby improving the actuator's stability and control accuracy.

[0003] The existing patent is mainly for "A Direct-Acting Relief Valve" applied for by Ningbo Mingqi Hydraulic Machinery Co., Ltd. The closest similarity lies in the structure of the valve core, valve stem, and auxiliary spring, the main function of which is to increase the pressure regulation range. This relief valve includes a valve body, a valve core assembly located within the valve body, and a pressure regulating mechanism. The valve body has an oil inlet and an overflow port at the front end. The valve core assembly includes a valve core, a valve seat, and a valve stem. The valve stem is located in the cavity of the front cover of the valve body and connected to an auxiliary spring. The pressure regulating mechanism includes a pressure regulating spring and a pressure regulating screw located within the valve body. One end of the pressure regulating spring is fixed to the valve seat, and the other end is connected to the pressure regulating screw. The pressure regulating screw passes through the rear cover of the valve body and is threaded to it. A handwheel is located at the end of the pressure regulating screw; rotating the handwheel drives the pressure regulating screw to compress the pressure regulating spring. This technology has the following shortcomings: its valve core, valve stem, and auxiliary spring structure mainly functions to increase the pressure regulation range; the valve stem and the ball core mating surface are in point contact, resulting in a small contact area and instability. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides a direct-acting overload replenishing valve. Based on the existing direct-acting overload replenishing valve structure, it integrates functions and optimizes structure and performance. While ensuring the reliability of the function, it achieves high-pressure overload protection and low-pressure replenishing functions in a smaller space requirement, and can quickly buffer impact pressure to meet the requirements of engineering machinery for lightweight hydraulic components and broaden the application range.

[0005] This invention is achieved through the following technical solution: a direct-acting overload replenishing oil valve, characterized in that it includes an upper valve sleeve, an overflow valve return spring, a ball valve seat, a ball core, a valve seat, a valve core, a stabilizing spring, a disc valve core, a spring seat, a one-way valve return spring, and a lower valve sleeve. The upper valve sleeve and the lower valve sleeve are interference-fitted with the valve seat. The lower valve sleeve has an oil port I, and the upper valve sleeve has an oil port II. The overflow valve return spring, the ball valve seat, and the ball core are located inside the upper valve sleeve. The valve core, the stabilizing spring, the disc valve core, the spring seat, and the one-way valve return spring are located inside the lower valve sleeve. The overflow valve return spring abuts between the upper valve sleeve and the ball valve seat. The bottom of the ball valve seat is connected to the ball core, and the ball core connects the valve seat and the valve core. The stabilizing spring abuts between the valve core and the lower valve sleeve. The one-way valve return spring abuts between the spring seat and the lower valve sleeve. The disc valve core is located above the spring seat.

[0006] The valve seat has a central oil passage and surrounding through holes. The disc valve core has a hollow area and an outer ring sealing area. The central oil passage connects to the hollow area of ​​the disc valve core. The one-way valve return spring seals the outer ring sealing area against the bottom of the through holes around the valve seat to seal the oil passage.

[0007] The ball valve seat is subjected to a downward pre-tightening spring force from the relief valve return spring, which acts on the ball core. The valve core is subjected to an upward pre-tightening spring force from the stabilizing spring, which also acts on the ball core. The pre-tightening spring force of the relief valve return spring is much greater than that of the stabilizing spring. The ball core is pressed downward onto the valve seat, sealing the oil passage.

[0008] The oil port II connects to the through holes around the valve seat.

[0009] The oil port I is connected to the hollow area of ​​the disc valve core.

[0010] The beneficial effects of this invention are: while ensuring the reliability of its function, it simplifies the oil replenishment mechanism, and has the advantages of small size, compact structure, fast response, small internal leakage, flexible application, and simple installation and maintenance. It can maintain constant pressure even under vibration conditions, ensuring the reliable operation of the hydraulic system. The addition of a stabilizing spring quickly buffers impact pressure, keeping the relief valve opening stable and extending its service life. It can realize overload oil replenishment function and can also be used as a one-way relief valve. Existing overload oil replenishment valves rely on the negative pressure generated during cavitation to push the valve core for oil replenishment, and cannot actively move oil from the return port to the inlet port. This invention achieves oil replenishment by using the negative pressure generated during cavitation to push the valve core, and can also actively enter oil from the return port to push the disc valve core, realizing the reverse one-way valve function. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the valve seat structure of the present invention;

[0014] Figure 3 This is a cross-sectional view of the valve seat of the present invention;

[0015] Figure 4 This is a schematic diagram of the valve core structure of the present invention;

[0016] Figure 5 This is a cross-sectional view of the valve core of the present invention;

[0017] Figure 6 This is a schematic diagram of the disc valve core of the present invention.

[0018] In the diagram: 1. Upper valve sleeve; 2. Relief valve return spring; 3. Ball valve seat; 4. Ball core; 5. Valve seat; 6. Valve core; 7. Stabilizing spring; 8. Disc valve core; 9. Spring seat; 10. Check valve return spring; 11. Lower valve sleeve; 12. Oil port I; 13. Oil port II; 51. Central oil passage; 52. Through hole; 81. Hollow area; 82. Outer ring sealing area. Implementation

[0019] like Figures 1 to 6 The direct-acting overload replenishing valve shown is characterized by comprising an upper valve sleeve 1, a relief valve return spring 2, a ball valve seat 3, a ball core 4, a valve seat 5, a valve core 6, a stabilizing spring 7, a disc valve core 8, a spring seat 9, a one-way valve return spring 10, and a lower valve sleeve 11. The upper valve sleeve 1 and the lower valve sleeve 11 are interference-fitted with the valve seat 5. The lower valve sleeve 11 has an oil port I 12, and the upper valve sleeve 1 has an oil port II 13. The relief valve return spring 2, the ball valve seat 3, and the ball core 4 are located on the upper valve sleeve 1. Inside, the valve core 6, the stabilizing spring 7, the disc valve core 8, the spring seat 9, and the one-way valve return spring 10 are disposed inside the lower valve sleeve 11. The overflow valve return spring 2 is abutted between the upper valve sleeve 1 and the ball valve seat 3. The bottom of the ball valve seat 3 is connected to the ball core 4. The ball core 4 is connected to the valve seat 5 and the valve core 6. The stabilizing spring 7 is abutted between the valve core 6 and the lower valve sleeve 11. The one-way valve return spring 10 is abutted between the spring seat 9 and the lower valve sleeve 11. The disc valve core 8 is disposed above the spring seat 9.

[0020] The valve seat 5 is provided with a central oil passage 51 and a surrounding through hole 52. The disc valve core 8 is provided with a hollow area 81 and an outer ring sealing area 82. The central oil passage 51 is connected to the hollow area 81 of the disc valve core 8. The one-way valve return spring 10 presses the outer ring sealing area 82 against the bottom of the through hole 52 around the valve seat 5 to seal the oil passage.

[0021] The ball valve seat 3 is subjected to a downward pre-tightening spring force from the relief valve reset spring 2, which acts on the ball core 4. The valve core 6 is subjected to an upward pre-tightening spring force from the stabilizing spring 7, which also acts on the ball core 4. The pre-tightening spring force of the relief valve reset spring 2 is much greater than that of the stabilizing spring 7. The ball core 4 is pressed downward onto the valve seat 5, sealing the oil passage.

[0022] The oil port II13 connects to the through holes 52 around the valve seat 5.

[0023] The oil port I12 is connected to the hollow area 81 of the disc valve core 8.

[0024] Oil port I12 is the inlet of the overload valve and the outlet of the replenishing valve, and oil port II13 is the outlet of the overload valve and the inlet of the replenishing valve. The specific operation is as follows:

[0025] Initial position: The ball valve seat 3 is subjected to the downward pre-tightening spring force of the relief valve return spring 2, which acts on the ball core 4. The valve core 6 is subjected to the upward pre-tightening spring force of the stabilizing spring 7, which also acts on the ball core 4. Since the pre-tightening spring force of the relief valve return spring 2 is much greater than that of the stabilizing spring 7, the ball core 4 is pressed downward on the valve seat 5 in the initial state, sealing the oil passage. The disc valve core 8 is subjected to the pre-tightening spring force of the one-way valve return spring 10 transmitted by the spring seat 9, and is pressed on the bottom surface of the valve seat 5, sealing the oil passage.

[0026] Example 1: Overload function of direct-acting overload replenishing valve:

[0027] When oil enters through port II13, the disc valve core 8 contacts the spring seat 9 and is subjected to the upward spring force of the stabilizing spring 7, which engages with the metal surface of the valve seat 5, closing the one-way valve. The oil then passes through the hollow area 81 of the disc valve core 8 to reach the central oil passage 51 of the valve seat 5. The oil pressure acts on the ball core 4. When the inlet pressure is low, the valve core 4 is pressed to the lowest position under the spring force of the relief valve reset spring 2, sealing the central passage of the valve seat 5 and preventing overflow. When the inlet pressure of the valve increases, making the oil pressure at the lower end of the ball core 4 sufficient to overcome the relief valve reset spring force, the ball valve seat 3, ball core 4, and valve core 6 move upward, connecting port I12 with port II13, thus achieving overflow.

[0028] Example 2: Oil replenishment function of direct-acting overload replenishing valve:

[0029] When the pressure at port II13 is negative due to the movement of the hydraulic cylinder or hydraulic motor, the oil at port I12 acts on the outer ring sealing area 82 of the disc valve core 8 through the holes 52 around the valve seat 5. When it overcomes the spring force of the one-way valve return spring 10, the disc valve core 8 moves downward, so that port I12 and port II13 are connected, thus realizing the oil replenishment function.

Claims

1. A direct-acting overload replenishing valve, characterized in that: The valve includes an upper valve sleeve (1), an overflow valve return spring (2), a ball valve seat (3), a ball core (4), a valve seat (5), a valve core (6), a stabilizing spring (7), a disc valve core (8), a spring seat (9), a one-way valve return spring (10), and a lower valve sleeve (11). The upper valve sleeve (1) and the lower valve sleeve (11) are interference-fitted with the valve seat (5). The lower valve sleeve (11) has an oil port I (12), and the upper valve sleeve (1) has an oil port II (13). The overflow valve return spring (2), the ball valve seat (3), and the ball core (4) are located inside the upper valve sleeve (1). The valve core (6), the stabilizing spring (7), the disc valve core (8), the spring seat (9), and the one-way valve return spring (10) are located inside the lower valve sleeve (11). The overflow valve return spring (2) abuts against the upper valve sleeve (11). 1) Between the ball valve seat (3) and the ball valve seat (3), the bottom of the ball valve seat (3) is connected to the ball core (4), the ball core (4) is connected to the valve seat (5) and the valve core (6), the stabilizing spring (7) is abutted between the valve core (6) and the lower valve sleeve (11), the one-way valve reset spring (10) is abutted between the spring seat (9) and the lower valve sleeve (11), and the disc valve core (8) is set above the spring seat (9); the valve seat (5) is provided with a central oil passage (51) and a surrounding through hole (52), the disc valve core (8) is provided with a hollow area (81) and an outer ring sealing area (82), the central oil passage (51) is connected to the hollow area (81) of the disc valve core (8), and the one-way valve reset spring (10) seals the oil passage at the bottom of the surrounding through hole (52) of the valve seat (5).

2. The direct-acting overload replenishing valve according to claim 1, characterized in that: The ball valve seat (3) is subjected to the downward pre-tightening spring force of the relief valve reset spring (2) and acts on the ball core (4). The valve core (6) is subjected to the upward pre-tightening spring force of the stabilizing spring (7) and acts on the ball core (4). The pre-tightening spring force of the relief valve reset spring (2) is much greater than the pre-tightening spring force of the stabilizing spring (7). The ball core (4) is pressed downward on the valve seat (5) to seal the oil passage.

3. The direct-acting overload replenishing valve according to claim 1, characterized in that: The oil port II (13) is connected to the through hole (52) around the valve seat (5).

4. The direct-acting overload replenishing valve according to claim 1, characterized in that: The oil port I (12) is connected to the hollow area (81) of the disc valve core (8).

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