Priority logic screw-in cartridge valve

Abstract

A priority logic screw plug valve is characterized by comprising a screw sleeve, a valve sleeve, a valve core and a spring, the screw sleeve has an inner cavity, and the inner cavity forms a mounting port at the front end; the valve sleeve is axially hollow and arranged on the mounting port of the screw sleeve, and the valve sleeve is radially provided with an oil outlet and a damping oil port; the valve core is arranged in the valve sleeve in an axially movable manner and closes the inner cavity of the screw sleeve to form a control cavity, and the front end of the valve core is provided with an oil inlet cavity, the axial port of the oil inlet cavity forms an oil inlet, and the radial oil outlet hole is formed. In the initial state, the oil flows into the oil inlet, flows out to the oil outlet of the valve sleeve through the oil outlet hole of the valve core; as the oil pressure rises, the spring compression force is overcome, the valve core is pushed back, the valve core covers and closes the oil outlet of the valve sleeve, the oil flow is cut off, and the oil flows through the oil outlet hole of the valve core and the damping oil port of the valve sleeve. The whole has the advantages of compactness, miniaturization, modularity, high response and anti-interference.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to a priority logic valve, which can be applied to industrial hydraulic systems and mobile hydraulic equipment. Background Technology

[0002] In various industrial hydraulic systems and mobile hydraulic equipment, the control of complex actions involving multiple mechanisms is becoming increasingly common. When evaluating the logical relationships between various actions, actions involving safety indicators are often prioritized for control. For example, when a mobile device stops, the parking brake must mechanically apply pressure to the friction pads to lock the brake. When the mobile device starts working, the hydraulic cylinder must first release the mechanical clamping force to release the brake. This necessitates the application of priority logic control.

[0003] Priority logic control is traditionally implemented using plate-type control valves. However, these valves no longer meet the requirements for compactness, miniaturization, modularity, high response, and interference resistance. Therefore, priority logic control valves need to be upgraded and improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a compact priority logic threaded cartridge valve in view of the above-mentioned technical status.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a priority logic threaded cartridge valve, characterized in that it includes...

[0006] The threaded sleeve has an inner cavity, and the front end of the inner cavity forms an installation port;

[0007] The valve sleeve is axially hollow and is located on the mounting port of the aforementioned threaded sleeve. The valve sleeve has an oil outlet and a damping oil outlet radially.

[0008] A valve core, axially movable within the aforementioned valve sleeve, closes the inner cavity of the threaded sleeve to form a control chamber. The front end of the valve core has an oil inlet chamber, with its axial port forming an oil inlet and its radial port forming an oil outlet.

[0009] A spring, located within the aforementioned threaded sleeve, consistently forces the valve core to maintain a forward-moving tendency;

[0010] In the initial state, the oil flows in through the inlet, passes through the outlet of the valve core, and flows out to the outlet of the valve sleeve. As the oil pressure increases, it overcomes the clamping force of the spring and pushes the valve core to move backward. The outlet of the valve sleeve is closed by the valve core, stopping the flow of oil. The oil then flows through the outlet of the valve core and the damping port of the valve sleeve.

[0011] Furthermore, the threaded sleeve is equipped with a spring seat, the front end of which abuts against the valve core, and the rear end abuts against the spring seat. Different spring seats can be equipped with different types of springs to accommodate a uniform threaded sleeve. Alternatively, a spring seat can be omitted, and the spring can be directly abutted against the inner wall of the threaded sleeve.

[0012] Furthermore, the valve sleeve includes a narrow section at the front end and a wide section at the rear end, with a stepped ring formed between the narrow section and the wide section. The valve core has a raised limiting ring in the middle, with the radial length of the limiting ring being greater than that of the narrow section but less than that of the wide section. The limiting ring can cooperate with the stepped ring to prevent the valve core from disengaging from the valve sleeve.

[0013] Preferably, the valve core includes a cylindrical portion and a solid portion located at the rear end of the cylindrical portion. The oil inlet chamber, oil inlet, and oil outlet are all formed on the aforementioned cylindrical portion, and the limiting ring is formed at the junction of the cylindrical portion and the solid portion.

[0014] The damping port is equipped with a damping screw plug, and a damping hole is formed in the middle of the damping screw plug to allow oil to pass through. Of course, the damping hole can also be machined directly into the valve sleeve.

[0015] Compared with existing technologies, the advantages of this invention are: the damping port can limit the oil discharge speed of the control chamber, thereby slowing down the movement speed of the valve core. The overall design is compact, miniaturized, modular, highly responsive, and anti-interference. Through cartridge integration, costs are reduced and customization is improved; dynamic performance is optimized, significantly shortening response time; automatic priority action of the circuit eliminates manual operation and avoids safety hazards caused by forgetfulness or other errors. It can serve as a core component in hydraulic transmission and control systems to achieve flow distribution and pressure priority control of multiple actuators, realizing priority logic control of the hydraulic circuit. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of an embodiment.

[0017] Figure 2 for Figure 1 Schematic diagram of the middle valve sleeve structure.

[0018] Figure 3 for Figure 1 Schematic diagram of the valve core structure. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the priority logic threaded cartridge valve in this embodiment includes a threaded sleeve 1, a valve sleeve 2, a valve core 3, a spring 4, and a spring seat 41. The threaded sleeve 1 has an inner cavity, and the front end of the inner cavity forms an installation port; the valve sleeve 2 is axially hollow and is located on the installation port of the threaded sleeve 1. The valve sleeve 2 has a radially opened oil outlet 21 and a damping oil port; a damping screw plug 5 is provided on the damping oil port, and a damping hole 51 is formed in the middle of the damping screw plug 5 to allow oil to pass through.

[0021] The valve core 3 is axially movable inside the valve sleeve 2 and closes the inner cavity of the screw sleeve 1 to form a control cavity 10. The front end of the valve core 3 has an oil inlet cavity 20, the axial port of the oil inlet cavity 20 forms an oil inlet 31, and the radial port forms an oil outlet 32.

[0022] Spring 4 is located inside the screw sleeve 1 and always forces valve core 3 to maintain a forward movement tendency; spring seat 41 is located inside the screw sleeve 1, with the front end of spring 4 abutting against valve core 3 and the rear end abutting against spring seat 41.

[0023] Combination Figure 2 As shown, the valve sleeve 2 in this embodiment includes a narrow section 2a at the front end and a wide section 2b at the rear end. A stepped ring 2c is formed between the narrow section 2a and the wide section 2b. The valve core 3 has a raised limiting ring 3c in the middle. The radial length of the limiting ring 3c is greater than that of the narrow section 2a but less than that of the wide section 2b. The limiting ring 3c can cooperate with the stepped ring 2c to restrict the valve core 3 from disengaging from the valve sleeve 2.

[0024] Combination Figure 3 As shown, the valve core 3 includes a cylindrical part 3a and a solid part 3b located at the rear end of the cylindrical part 3a. The oil inlet chamber 20, the oil inlet 31, and the oil outlet 32 ​​are all formed on the cylindrical part 3a, and the limiting ring 3c is formed at the junction of the cylindrical part 3a and the solid part 3b.

[0025] Working principle: Oil flows in through the inlet, passes through the outlet of the valve core, and flows out to the outlet of the valve sleeve; as the oil pressure increases, a pressure difference is generated between the inlet chamber and the control chamber of the valve core, which overcomes the spring clamping force and pushes the valve core to move to the left, closing the inlet and outlet and stopping the flow of oil.

[0026] By controlling the flow of oil through the damping port, the inlet and outlet ports are switched on and off, thereby achieving high-pressure, high-flow logic control.

[0027] The valve core has a cylindrical front end and a solid rear end, isolating the oil inlet chamber from the control chamber. Only a small pressure difference is needed to overcome the spring, ensuring sensitive control characteristics. The cylindrical fit between the front end of the valve core and the front end of the valve sleeve ensures easy high-precision fitting while providing axial restraint, guaranteeing smooth valve core movement and a smooth, shock-free valve opening and closing characteristic. The damping orifice in the center of the damping plug limits the oil discharge speed from the control chamber, thus slowing down the valve core's movement and providing high-frequency response characteristics. The control chamber is an independent, closed cavity, absorbing a small amount of leaked oil with almost no energy loss.

[0028] It features a compact, miniaturized design, modularity, high responsiveness, and interference resistance. Through plug-in integration, it reduces costs and enhances customizability. Dynamic performance optimization significantly shortens response time. Automatic priority operation of the circuit eliminates the need for manual operation, preventing safety hazards caused by forgetfulness or other errors. It can serve as a core component in hydraulic transmission and control systems to achieve flow distribution and pressure priority control across multiple actuators, realizing priority logic control of the hydraulic circuit.

Claims

1. A priority logic threaded cartridge valve, characterized in that... include The threaded sleeve (1) has an inner cavity, and the front end of the inner cavity forms an installation port; The valve sleeve (2) is axially hollow and is located on the mounting port of the aforementioned threaded sleeve (1). The valve sleeve (2) has an oil outlet (21) and a damping oil port radially opened. A valve core (3) is axially movable within the aforementioned valve sleeve (2) and closes the inner cavity of the threaded sleeve (1) to form a control cavity (10). The front end of the valve core (3) has an oil inlet cavity (20), the axial port of which forms an oil inlet (31), and the radial port forms an oil outlet (32); and A spring (4) is provided inside the aforementioned screw sleeve (1) and always forces the valve core (3) to maintain a forward movement tendency; In the initial state, the oil flows in through the inlet (31), through the outlet (32) of the valve core (3), and out to the outlet (21) of the valve sleeve (2). As the oil pressure increases, it overcomes the clamping force of the spring (4) and pushes the valve core (3) to move backward. The outlet (21) of the valve sleeve (2) is covered and closed by the valve core (3), stopping the flow of oil. The oil flows through the outlet (32) of the valve core (3) and the damping port of the valve sleeve (2).

2. The priority logic threaded cartridge valve according to claim 1, characterized in that... The screw sleeve (1) is provided with a spring seat (41), and the front end of the spring (4) abuts against the valve core (3) and the rear end abuts against the spring seat (41).

3. The priority logic threaded cartridge valve according to claim 1, characterized in that... The valve sleeve (2) includes a narrow section (2a) at the front end and a wide section (2b) at the rear end. A stepped ring (2c) is formed between the narrow section (2a) and the wide section (2b). The valve core (3) has a raised limiting ring (3c) in the middle. The radial length of the limiting ring (3c) is greater than that of the narrow section (2a) and less than that of the wide section (2b). The limiting ring (3c) can cooperate with the stepped ring (2c) to restrict the valve core (3) from disengaging from the valve sleeve (2).

4. The priority logic threaded cartridge valve according to claim 3, characterized in that... The valve core (3) includes a cylindrical part (3a) and a solid part (3b) located at the rear end of the cylindrical part (3a). The oil inlet chamber (20), oil inlet (31), and oil outlet (32) are all formed on the aforementioned cylindrical part (3a). The limiting ring (3c) is formed at the junction of the cylindrical part (3a) and the solid part (3b).

5. The priority logic threaded cartridge valve according to claim 1, characterized in that... The damping port is provided with a damping screw plug (5), and a damping hole (51) is formed in the middle of the damping screw plug (5) to allow oil to pass through.

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