A hydraulically limited adjustable valve port structure

Abstract

This invention provides a hydraulically limited adjustable valve port structure, comprising: a housing, a main valve core, a damper, a main valve preload spring, a pressure ring, a sealing steel ball, a splined spring pin, and a shaft end retaining ring for bores. The main valve core is pressed against the bottom of the housing by the main valve preload spring. The damper and the pressure ring are respectively threaded onto the main valve core. The damper is installed in a damper mounting hole on the side of the main valve core, and the damper mounting hole communicates with the upper end face of the main valve core. The pressure ring is threaded and can be adjusted in position along the axial direction of the main valve core. The sealing steel ball is installed in the mounting hole of the main valve core through a splined spring pin and a shaft end retaining ring for bores. This structure is mainly used in the main valve of pilot-controlled valves. By adjusting the relevant structure and parameters of the valve port, the opening degree of the main valve port can be adjusted under the same working pressure difference, and the maximum working opening degree can be hydraulically limited. This improves the performance consistency and interchangeability of electromagnetic locking valve products, reduces mechanical limiting impact, and makes them more suitable for application requirements.

Description

Technical Field

[0001] This invention relates to a hydraulically limited adjustable valve port structure. Background Technology

[0002] The electromagnetic locking valve, which is matched with the electromechanical hydrostatic system, is used in pairs in the system. It is arranged on the oil line connecting the two chambers of the actuator and the bidirectional pump oil port. When the servo mechanism is in a non-working state or needs to be locked in the working position, the electromagnetic locking valve closes the two chambers of the actuator, keeping the piston rod stationary. When the servo mechanism is in a working state, the electromagnetic locking valve keeps the oil line between the two chambers of the actuator and the pump connected.

[0003] Existing technologies have limited valve opening degree after machining, which is essentially unadjustable under the same working pressure differential. There are certain differences between different batches of products and between different products in the same batch. Existing technologies use mechanical structures to limit the maximum valve opening degree, which causes impact damage to components during the limiting process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the present invention can effectively control the pressure loss generated when the flow rate through the valve port is fixed by adjusting the relevant structure and parameters of the valve port, thereby improving the performance consistency and interchangeability of the electromagnetic locking valve and making it more suitable for application requirements.

[0005] The technical solution adopted in this invention is: a hydraulically limited adjustable valve port structure, comprising: a housing, a main valve core, a damper, a main valve preload spring, a pressure ring, a sealing ball, a flower-shaped spring pin, and a shaft end retaining ring for the bore.

[0006] The main valve core is pressed against the bottom of the housing by the main valve preload spring. The damper and the pressure ring are respectively installed on the main valve core by threads. The damper is installed in the damper mounting hole on the side of the main valve core. The damper mounting hole is connected to the upper end face of the main valve core. The pressure ring is connected by threads and can be adjusted in position along the axial direction of the main valve core. The sealing steel ball is installed in the mounting hole of the main valve core by a spring pin and a shaft end retaining ring. The bottom end face of the housing is provided with the main valve B oil passage hole. The bottom end side wall is symmetrically provided with the main valve A oil passage hole. The middle section of the housing is provided with the pilot valve oil passage hole radially. The bottom of the mounting hole on the main valve core for installing the sealing steel ball is connected to the upper end face of the main valve core to form the pilot valve control oil passage.

[0007] Furthermore, when the pilot valve control oil port is closed and the oil pressure in the main valve A oil passage is high, the oil pressure on the upper end face of the main valve core is consistent with that in the main valve A oil passage. Under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring, the main valve core is pressed against the bottom of the housing, thereby closing the main valve port.

[0008] Furthermore, when the pilot valve control oil port is open and the oil pressure in the main valve A oil port is high, the oil flows through the pilot oil port and the pilot valve control oil port into the main valve B oil port with lower pressure. Under the action of the damper throttling orifice, the oil pressure on the upper end face of the main valve core is between the main valve A oil port and the main valve B oil port. Under the combined action of the oil pressure on the upper and lower end faces of the main valve core and the main valve preload spring, the main valve port is opened.

[0009] Furthermore, when the pilot valve control oil port is open and the oil pressure in the main valve B passage is high, the sealing steel ball closes the pilot valve control oil port under the action of the oil. The main valve core opens the main valve port under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring.

[0010] Furthermore, by adjusting the installation position of the pressure bearing ring on the main valve core, the pressure of the working medium on the lower end face of the main valve core is adjusted, thereby controlling the opening power of the main valve port when the pressure of the working medium in the oil passage of the main valve A is higher than that in the oil passage of the main valve B when the pilot valve is opened.

[0011] Furthermore, by adjusting the size of the throttling orifice on the damper, the pressure of the working medium on the upper end face of the main valve core is adjusted, controlling the opening resistance of the main valve port when the working medium pressure in the main valve A oil passage is higher than that in the main valve B oil passage when the pilot valve is opened, and controlling the opening time of the main valve port when the working medium pressure in the main valve B oil passage is higher than that in the main valve A oil passage.

[0012] Furthermore, by adjusting the size of the pilot control oil hole, the pressure of the working medium on the upper end face of the main valve core is adjusted, controlling the opening resistance of the main valve port when the working medium pressure in the main valve A oil hole is higher than that in the main valve B oil hole when the pilot valve is opened, and controlling the opening time of the main valve port when the working medium pressure in the main valve A oil hole is higher than that in the main valve B oil hole.

[0013] Furthermore, the pressure on the upper end face of the main valve core is adjusted as follows: when the pilot valve control oil hole is open and the oil pressure in the main valve A oil passage is high, the diameter of the damper's throttle orifice and the pilot valve oil passage orifice is adjusted proportionally to change the pressure on the upper end face of the main valve core.

[0014] Furthermore, it also includes an anti-rotation locking spring and an anti-rotation pin; the pressure ring is locked in position by the anti-rotation pin, and the anti-rotation pin is axially adjusted by the anti-rotation pin locking spring. The anti-rotation pin is installed in the corresponding hole of the main valve core, and the anti-rotation pin is pressed into the pin hole on the pressure ring by the anti-rotation pin locking spring. The pressure ring and the main valve core are connected, so that the pressure ring cannot rotate along its axis, thereby achieving the purpose of thread anti-loosening and locking the position of the pressure ring.

[0015] Furthermore, the anti-rotation pin hole on the pressure ring is a blind hole, so that the anti-rotation pin cannot be dislodged under the action of the locking spring. The number of pin holes depends on the adjustment position of the pressure ring.

[0016] The advantages of this invention compared to the prior art are:

[0017] (1) The present invention can adjust the opening degree of the main valve port under the same working pressure difference by adjusting the relevant structure and parameters of the valve port, thereby improving the consistency and interchangeability of product performance.

[0018] (2) The present invention can hydraulically limit the maximum working opening of the valve port by adjusting the relevant structure and parameters of the valve port, thereby avoiding impact damage to the parts caused by mechanical limiting.

[0019] (3) The present invention can adjust the opening and closing time of the main valve by adjusting the relevant structure and parameters of the valve port.

[0020] (4) The present invention separates the oil supply circuits of the main valve and the pilot valve, thereby reducing the impact of the opening and closing of the main valve port on the control circuit of the pilot valve.

[0021] (5) The present invention can lock the position of the pressure ring through the anti-loosening structure of the pressure ring. Attached Figure Description

[0022] Figure 1 A schematic diagram of the adjustable valve port structure for hydraulic limit;

[0023] 1-Housing, 2-Main valve core, 3-Damper, 4-Main valve preload spring, 5-Anti-rotation locking spring, 6-Anti-rotation pin, 7-Pressure ring, 8-Sealing steel ball, 9-Spangled spring pin, 10-Hole end retaining ring

[0024] Figure 2 A schematic diagram of the oil hole structure of the hydraulically adjustable valve port;

[0025] Figure 3 A schematic diagram of fluid flow after the main valve port is opened;

[0026] Figure 4 Fluid flow direction diagram when the main valve port is open (the oil pressure in the oil passage of main valve A is relatively high);

[0027] Figure 5 The fluid flow direction diagram when the main valve port is open (the oil pressure in the oil passage of the main valve B is relatively high). Detailed Implementation

[0028] The present invention will be described in conjunction with the accompanying drawings.

[0029] This invention provides a hydraulically limited adjustable valve port structure, applicable to the main valve port structure of pilot-controlled valves. When the pilot valve port opens, the main valve port completes the opening and closing process along with the movement of the main valve core. See the detailed structure below. Figure 1 , Figure 2 The details are as follows:

[0030] The main valve core 2 is pressed against the bottom of the housing 1 by the main valve preload spring 4. The damper 3 and the pressure ring 7 are respectively threaded onto the main valve core 2. The damper 3 is installed in the damper mounting hole on the side of the main valve core 2. The damper mounting hole is connected to the end of the main valve core that contacts the preload spring 4. The pressure ring 7 can be adjusted in position along the axial direction of the main valve core 2 by threaded connection and is locked in position by the anti-rotation pin 6. The anti-rotation pin 6 is axially adjusted by the anti-rotation pin locking spring 5. The sealing steel ball 8 is installed in the mounting hole of the main valve core 2 by the flower head spring pin 9 and the hole end retaining ring 10. The bottom end face of the housing 1 is provided with the main valve B oil passage hole 1-4. The bottom end side wall is symmetrically provided with the main valve A oil passage hole 1-1. The middle section of the housing 1 is provided with the pilot valve oil passage hole 1-2 radially. The bottom of the mounting hole on the main valve core 2 for installing the sealing steel ball is connected to the upper end face of the main valve core to form the pilot valve control oil passage hole 1-3.

[0031] When the pilot valve control oil hole 1-3 is closed and the oil pressure in the main valve A oil passage 1-1 is high, the oil pressure on the upper end face of the main valve core 2 is consistent with that in the main valve A oil passage 1-1. Under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring 4, the main valve core 2 is pressed against the bottom of the housing 1, thereby closing the main valve port.

[0032] like Figure 3 , Figure 4 As shown, when the pilot valve control oil hole 1-3 is open and the oil pressure in the main valve A oil hole 1-1 is high, the oil enters the main valve B oil hole 1-4 with lower pressure through the pilot oil hole 1-2 and the pilot valve control oil hole 1-3. Under the action of the damper throttling orifice, the oil pressure on the upper end face of the main valve core 2 is between the main valve A oil hole 1-1 and the main valve B oil hole 1-4. Under the combined action of the oil pressure on the upper and lower end faces of the main valve core 2 and the main valve preload spring 4, the main valve port is opened downward.

[0033] like Figure 5 As shown, when the pilot valve control oil hole 1-3 is open and the oil pressure in the main valve B oil passage hole 1-4 is high, the sealing steel ball 8 closes the pilot valve control oil hole 1-2 under the action of the oil. The main valve core 2 opens the main valve port under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring 4.

[0034] By adjusting the specific installation position of the pressure bearing ring 7 on the main valve core 2, the pressure of the working medium on the lower end face of the main valve core is adjusted, effectively controlling the opening power of the main valve port when the working medium pressure in the main valve A oil passage 1-1 is higher than that in the main valve B oil passage 1-4.

[0035] By adjusting the size of the throttling orifice on the damper 3, the pressure of the working medium on the upper end face of the main valve core 2 is adjusted, effectively controlling the resistance to the opening of the main valve port when the pressure of the working medium in the main valve A oil passage 1-1 is higher than that in the main valve B oil passage 1-4, and controlling the opening time of the main valve port when the pressure of the working medium in the main valve B oil passage 1-4 is higher than that in the main valve A oil passage 1-1.

[0036] By adjusting the size of the pilot control oil hole 1-3, the pressure of the working medium on the upper end face of the main valve core 2 is adjusted, effectively controlling the opening resistance of the main valve port when the working medium pressure in the main valve A oil hole 1-1 is higher than that in the main valve B oil hole 1-4, and controlling the opening time of the main valve port when the working medium pressure in the main valve A oil hole 1-1 is higher than that in the main valve B oil hole 1-4.

[0037] The force on the main valve core 2 can be coarsely adjusted by adjusting the specific position of the pressure ring 7 on the main valve core 2, which is relatively easy to achieve. Then, the force on the main valve core 2 can be finely adjusted by adjusting the diameter of the damping orifice or throttling orifice, which is relatively difficult to achieve, so as to accurately control the force on the main valve core.

[0038] Working principle:

[0039] Pressure adjustment at the lower end of the main valve core: The outer diameter of the pressure ring 7 is slightly smaller than that of the main valve core 2 to avoid scraping against the main valve core mounting hole on the housing 1 and damaging the hole wall. When the pilot valve control oil hole 1-3 is open and the oil pressure in the main valve A oil passage hole 1-1 is high, the pressure of the pressure ring 7 is lower as it gets closer to the main valve port. Adjusting the pressure ring 7 along the axial direction of the main valve core 2 can effectively change the pressure distribution of the oil acting on the pressure ring 7, thereby changing the upward opening force of the main valve core 2.

[0040] Pressure adjustment of the upper end face of the main valve core: When the pilot valve control oil hole 1-3 is open and the oil pressure in the main valve A oil passage hole 1-1 is high, the orifice diameter of the damper 3 throttle orifice and the pilot valve oil passage hole 1-2 can be adjusted proportionally to effectively change the pressure of the upper end face of the main valve core. The throttle orifice is separated from the main valve core 2 and designed on the damper 3. The adjustment of the upper end face of the main valve core can be further refined through graded adjustment, which is more conducive to the flow test in the production process of the throttle orifice and reduces the difficulty of product processing.

[0041] 3. Anti-loosening mechanism of pressure ring 7: Anti-rotation pin 6 is installed in the corresponding hole of the main valve core, and is pressed into the pin hole on the pressure ring 7 by the anti-rotation pin locking spring 5. The pressure ring 7 is connected to the main valve core 2, preventing the pressure ring 7 from rotating along its axis, thereby achieving the purpose of thread anti-loosening and ensuring the stability of the pressure ring position. The pin hole on the pressure ring 7 used for anti-rotation is a blind hole, so that the anti-rotation pin 6 cannot be dislodged under the action of the locking spring 5. The number of these holes depends on the adjustment position of the pressure ring.

[0042] 4. Valve port structure: The main valve A oil passage 1-1 and the pilot valve oil passage 1-2 are respectively provided on the housing. The working medium acting on the lower end face of the main valve core and the working medium used to regulate the pressure of the upper end face of the main valve core are separated. This can effectively reduce the impact of the opening and closing of the main valve port on the oil pressure of the pilot valve oil passage 1-2, thereby stabilizing the pressure of the working medium on the upper end face of the main valve core and avoiding the main valve core from vibrating and causing unstable valve port opening.

[0043] The parts of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A hydraulically limited adjustable valve port structure, characterized in that, include: Housing (1), main valve core (2), damper (3), main valve preload spring (4), bearing ring (7), sealing ball (8), flower head spring pin (9) and bore shaft end retaining ring (10); The main valve core (2) is pressed against the bottom of the housing (1) by the main valve preload spring (4). The damper (3) and the pressure ring (7) are respectively installed on the main valve core (2) by threads. The damper (3) is installed in the damper mounting hole on the side of the main valve core (2). The damper mounting hole is connected to the upper end face of the main valve core. The pressure ring (7) is connected by threads and can be adjusted along the axial direction of the main valve core (2). The sealing steel ball (8) is installed in the mounting hole of the main valve core (2) by the flower head spring pin (9) and the hole end retaining ring (10). The bottom end face of the housing (1) is provided with the main valve B oil passage hole (1-4). The bottom side wall is symmetrically provided with the main valve A oil passage hole (1-1). The middle section of the housing (1) is provided with the pilot valve oil passage hole (1-2) along the radial direction. The bottom of the mounting hole on the main valve core (2) for installing the sealing steel ball is connected to the upper end face of the main valve core to form the pilot valve control oil hole (1-3).

2. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, When the pilot valve control oil hole (1-3) is closed and the oil pressure in the main valve A oil passage (1-1) is high, the oil pressure on the upper end face of the main valve core (2) is consistent with that in the main valve A oil passage (1-1). Under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring (4), the main valve core 2 is pressed against the bottom of the housing (1), thus closing the main valve port.

3. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, When the pilot valve control oil hole (1-3) is open and the oil pressure in the main valve A oil hole (1-1) is high, the oil enters the main valve B oil hole (1-4) with lower pressure through the pilot oil hole (1-2) and the pilot valve control oil hole (1-3). Under the action of the damper throttling orifice, the oil pressure on the upper end face of the main valve core (2) is between the main valve A oil hole (1-1) and the main valve B oil hole (1-4). The main valve core (2) opens the main valve port under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring (4).

4. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, When the pilot valve control oil hole (1-3) is open and the oil pressure in the main valve B oil passage (1-4) is high, the sealing steel ball (8) closes the pilot valve control oil hole (1-3) under the action of the oil. The main valve core (2) opens the main valve port under the combined action of the oil pressure on its upper and lower end faces and the main valve preload spring (4).

5. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, By adjusting the installation position of the pressure bearing ring (7) on the main valve core (2), the pressure of the working medium on the lower end face of the main valve core is adjusted, and the opening power of the main valve port is controlled when the pilot valve is opened, and the working medium pressure in the main valve A oil passage hole (1-1) is higher than that in the main valve B oil passage hole (1-4).

6. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, By adjusting the size of the throttling orifice on the damper (3), the pressure of the working medium on the upper end face of the main valve core (2) is adjusted, and the resistance to opening of the main valve port is controlled when the pressure of the working medium in the main valve A oil passage (1-1) is higher than that in the main valve B oil passage (1-4) when the pilot valve is opened. The opening time of the main valve port is also controlled when the pressure of the working medium in the main valve B oil passage (1-4) is higher than that in the main valve A oil passage (1-1).

7. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, By adjusting the size of the pilot control oil hole (1-3), the pressure of the working medium on the upper end face of the main valve core (2) is adjusted, and the resistance to opening of the main valve port is controlled when the pressure of the working medium in the main valve A oil hole (1-1) is higher than that in the main valve B oil hole (1-4) when the pilot valve is opened. The opening time of the main valve port is also controlled when the pressure of the working medium in the main valve A oil hole (1-1) is higher than that in the main valve B oil hole (1-4).

8. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, Pressure adjustment of the upper end face of the main valve core (2): When the pilot valve control oil hole (1-3) is open and the oil pressure in the main valve A oil passage hole (1-1) is high, the diameter of the throttle hole of the damper (3) and the pilot valve oil passage hole (1-2) is adjusted proportionally to change the pressure of the upper end face of the main valve core.

9. The hydraulically limited adjustable valve port structure according to claim 1, characterized in that, It also includes an anti-rotation locking spring (5) and an anti-rotation pin (6); the pressure ring (7) is locked in position by the anti-rotation pin (6), and the anti-rotation pin (6) is axially adjusted by the anti-rotation pin locking spring (5). The anti-rotation pin (6) is installed in the corresponding hole of the main valve core, and the anti-rotation pin (6) is pressed into the pin hole on the pressure ring (7) by the anti-rotation pin locking spring (5). The pressure ring (7) is connected to the main valve core (2), so that the pressure ring (7) cannot rotate along its axis, thereby achieving the purpose of thread anti-loosening and locking the position of the pressure ring.

10. The hydraulically limited adjustable valve port structure according to claim 9, characterized in that: The anti-rotation pin hole on the pressure ring (7) is a blind hole, so that the anti-rotation pin (6) cannot be dislodged under the action of the locking spring (5). The number of pin holes depends on the adjustment position of the pressure ring.

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