A hydraulic motor anti-internal leakage overflow valve

Abstract

This utility model discloses a hydraulic motor anti-internal leakage overflow valve, including a main valve body with an oil inlet, a first oil return port, and a second oil return port. The main valve body has an internal cavity and a pressure component. A connecting seat is provided on the main valve body, and a connecting rod is rotatably connected to the connecting seat. The connecting rod is used to adjust the pressure value of the pressure component. A buffer component is provided on the pressure component. A pressure-reducing hole is provided in the first oil return port. This utility model, through the design of the main valve core, buffer component, and pressure-reducing hole, allows the narrow channel of the pressure-reducing hole to ensure a smooth and controllable return process, avoiding secondary impacts caused by sudden pressure changes. The folded buffer component absorbs the high-frequency pressure pulsations generated during internal leakage, suppressing system vibration and noise, mitigating pressure shocks caused by internal leakage, and extending the life of hydraulic components.

Description

Technical Field

[0001] This utility model relates to the field of relief valve technology, and more specifically, to a hydraulic motor anti-internal leakage relief valve. Background Technology

[0002] The relief valve of a hydraulic motor is mainly used to limit system pressure. When the pressure in the hydraulic circuit exceeds the set value, the relief valve will automatically open, diverting excess oil back to the oil tank, thereby protecting the motor and pipeline from high-pressure damage and maintaining stable system pressure. Its core functions are overload protection and pressure regulation, ensuring the safe and stable operation of the hydraulic system.

[0003] However, existing technologies have some problems: when hydraulic motors are used for a long time, internal leakage can occur due to aging or wear of internal components, causing the pressure of the entire system to drop. The hydraulic pump needs to continuously supply oil to compensate for the leakage, which causes the relief valve to open more frequently or even remain in an overflow state for a long time. Repeated adjustments are needed to maintain the set pressure, which accelerates the wear of the valve core and spring, reduces control accuracy, and causes the relief valve to overheat or be damaged. Therefore, we propose a hydraulic motor anti-internal leakage relief valve. Utility Model Content

[0004] One objective of this invention is to provide a new technical solution for a hydraulic motor anti-internal leakage overflow valve.

[0005] According to the present invention, a hydraulic motor anti-internal leakage overflow valve includes a main valve body, an oil inlet, a first oil return port, and a second oil return port. The main valve body has an internal cavity and a pressure component. A connecting seat is provided on the main valve body, and a connecting rod is rotatably connected to the connecting seat. The connecting rod is used to adjust the pressure value of the pressure component. A buffer component is provided on the pressure component, and a pressure reducing hole is provided in the first oil return port.

[0006] Optionally, the pressure component includes a main valve core and a piston, with a spring disposed between the main valve core and the piston.

[0007] Optionally, one end of the connecting rod is rotatably connected to the piston, and the other end of the connecting rod is fixedly connected to a knob.

[0008] Optionally, the main valve core is arranged in an I-shape, one end of the main valve core is provided with a plunger, the plunger is slidably connected to the inner cavity, and the other end of the main valve core is provided with a connecting ring.

[0009] Optionally, one end of the spring is fixedly connected to the connecting ring, and the other end of the spring is fixedly connected to the piston.

[0010] Optionally, the plunger is threadedly connected to an end cap, the buffer is sleeved on the end cap, the buffer has a folded cavity, and the buffer is in contact with the inner cavity.

[0011] Optionally, both the end cap and the main valve core are provided with through holes, and the connecting ring is provided with damping holes.

[0012] Optionally, one end of the pressure reducing hole is connected to the first oil return port, and the other end of the pressure reducing hole is connected to the second oil return port. A narrow channel is formed inside the pressure reducing hole, and the corners of the pressure reducing hole are all rounded.

[0013] According to one embodiment of this disclosure, the hydraulic motor anti-internal leakage overflow valve, by setting a main valve core, a buffer component and a pressure reducing hole, etc., through the coordinated action of the pilot oil circuit and the main valve core, prevents the pressure abnormality caused by internal leakage of the hydraulic motor. The damping hole in the pilot oil circuit forms a stable pressure feedback, enabling the main valve core to respond quickly according to the system pressure change and open the pressure relief channel in time. At the same time, the cooperation between the buffer component and the valve body ensures complete sealing under normal working conditions, preventing the internal leakage oil from directly entering the return oil chamber and blocking the abnormal pressure relief path.

[0014] Furthermore, the combination of the pressure reducing orifice and the buffer can further enhance the protection against internal leakage. The narrow channel throttling and rounded corners of the pressure reducing orifice make the return oil process smooth and controllable, avoiding secondary impacts caused by sudden pressure changes. The folded buffer can absorb the high-frequency pressure pulsation generated by internal leakage, suppressing system vibration and noise. It can not only alleviate the pressure shock caused by internal leakage, but also extend the life of hydraulic components, thus improving the overall internal leakage prevention performance and safety of the hydraulic motor.

[0015] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of a hydraulic motor anti-internal leakage overflow valve in one embodiment;

[0018] Figure 2 A cross-sectional schematic diagram of the overall structure of the hydraulic motor anti-internal leakage overflow valve;

[0019] Figure 3 A cross-sectional schematic diagram of the pressure component structure of the anti-internal leakage overflow valve for a hydraulic motor.

[0020] Figure 4 This is a schematic diagram of the buffer structure of the anti-internal leakage overflow valve for a hydraulic motor.

[0021] The following are marked in the diagram: 1. Main valve body; 11. Oil inlet; 12. First oil return port; 13. Second oil return port; 14. Inner cavity; 15. Connecting seat; 16. Connecting rod;

[0022] 2. Pressure component; 21. Main valve core; 22. Piston; 23. Spring; 24. Knob; 25. Plunger component; 26. Connecting ring; 2501. End cap; 2601. Damping hole; 27. Through hole;

[0023] 3. Buffer component; 31. Folding cavity;

[0024] 4. Pressure reducing hole; 41. Narrow passage. Detailed Implementation

[0025] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0026] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0028] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0029] like Figure 1-4 As shown, a hydraulic motor anti-internal leakage overflow valve includes a main valve body 1, an oil inlet 11, a first oil return port 12, a second oil return port 13, an inner cavity 14 formed inside the main valve body 1, a pressure component 2 disposed inside the main valve body 1, a connecting seat 15 disposed on the main valve body 1, a connecting rod 16 rotatably connected to the connecting seat 15, the connecting rod 16 being used to adjust the pressure value of the pressure component 2, and a buffer component 3 disposed on the pressure component 2.

[0030] Furthermore, the hydraulic motor anti-internal leakage overflow valve provided by this utility model realizes oil circuit control through the oil inlet 11, the first oil return port 12 and the second oil return port 13 on the main valve body 1. The inner cavity 14 provided inside the main valve body 1 is used to provide the oil path. The inner cavity 14 is provided with grooves or slides corresponding to the pressure component 2 and piston 22 and other structures.

[0031] Pressure component 2 is the core pressure regulating element of this utility model, used to dynamically respond to changes in the system pressure of the hydraulic motor. The rotational engagement between the connecting seat 15 and the connecting rod 16 is used to manually adjust the pressure setting value, thereby improving the system adaptability.

[0032] The buffer 3 is installed on the pressure component 2 to suppress pressure fluctuations and hydraulic shocks, and to prevent the relief valve from frequently opening and closing due to internal leakage of the motor, thereby extending the valve life and maintaining system stability.

[0033] Specifically, the pressure component 2 includes a main valve core 21 and a piston 22. A spring 23 is provided between the main valve core 21 and the piston 22. One end of the connecting rod 16 is rotatably connected to the piston 22, and the other end of the connecting rod 16 is fixedly connected to a knob 24. One end of the spring 23 is fixedly connected to a connecting ring 26, and the other end of the spring 23 is fixedly connected to the piston 22.

[0034] Furthermore, the pressure component 2 uses a main valve core 21, a piston 22, and a spring 23 for linkage adjustment, and achieves pressure control through a mechanical structure. The main valve core 21 is responsible for the opening and closing of the oil circuit, the piston 22 serves as a pressure sensing element, and the spring 23 provides a preset clamping force, thereby quickly responding to changes in system pressure.

[0035] The connecting rod 16 is rotatably connected to the piston 22 at one end and the knob 24 is fixed at the other end, which ensures the effective transmission of force during adjustment and avoids the jamming problem caused by the piston 22 being subjected to lateral force.

[0036] When the knob 24 is rotated, the connecting rod 16 drives the piston 22 to move axially, changing the compression of the spring 23, thereby adjusting the opening pressure value of the relief valve.

[0037] Furthermore, it adopts mechanical adjustment, which is simple and reliable in structure, requires no additional power source, and is suitable for harsh working conditions.

[0038] Specifically, the main valve core 21 is arranged in an I-shape. One end of the main valve core 21 is provided with a plunger 25, which is slidably connected to the inner cavity 14. The other end of the main valve core 21 is provided with a connecting ring 26. An end cap 2501 is threadedly connected to the plunger 25. A buffer 3 is sleeved on the end cap 2501. A folded cavity 31 is formed on the buffer 3, which is in contact with the inner cavity 14.

[0039] Furthermore, the main valve core 21 adopts an I-shaped structure, with plunger parts 25 and connecting rings 26 at both ends, forming a stable axial guide and force balance. The plunger parts 25 slide with the inner cavity 14 to ensure the centering of the valve core during movement and reduce the risk of uneven wear.

[0040] The end cap 2501 is threadedly connected to the plunger 25, which facilitates disassembly and maintenance, and also clamps and fixes the buffer 3.

[0041] It should be noted that the outer diameter of the buffer 3, the plunger 25, and the end cap 2501 ensure that the buffer 3 fits into the inner cavity 14 during the blocking process.

[0042] The buffer 3 achieves multi-stage elastic deformation through the folded cavity 31, which absorbs impact energy when the system pressure changes suddenly, suppresses the oscillation of the main valve core 21, and increases the buffer stroke through the gap of the folded cavity 31. Together with the contact friction of the inner cavity 14 wall, a damping effect is formed, which further attenuates the pressure fluctuation. It can not only quickly suppress the instantaneous high pressure caused by the internal leakage of the motor, but also avoid the fatigue failure problem of the traditional spring 23 buffer.

[0043] Specifically, both the end cap 2501 and the main valve core 21 are provided with through holes 27, and the connecting ring 26 is provided with damping holes 2601.

[0044] Furthermore, the end cap 2501, the through hole 27 on the main valve core 21, and the damping hole 2601 on the connecting ring 26 together form a pilot oil circuit. After the hydraulic oil enters the inner cavity 14, it first enters the space between the connecting ring 26 and the piston 22 through the through hole 27 on the end cap 2501 and the main valve core 21, and then enters the space between the plunger 25 and the connecting ring 26 through the damping hole 2601 on the connecting ring 26. Finally, it is discharged from the first return port 12.

[0045] The end cap 2501 and the through hole 27 of the main valve core 21 form a primary throttling channel, which can initially stabilize the oil flow. The damping hole 2601 on the connecting ring 26 serves as a secondary adjustment structure, which adjusts the flow rate and pressure gradient of the pilot oil circuit by first increasing the diameter and then decreasing the diameter.

[0046] Furthermore, firstly, the throttling effect of the damping orifice 2601 is used to reduce the direct impact of pressure fluctuations on the main valve core 21, thereby improving system stability;

[0047] Secondly, the main valve core 21 is smoothly operated by the feedback adjustment of the pilot oil circuit to avoid hydraulic shock.

[0048] Finally, when internal leakage occurs in the hydraulic motor, the staged oil circuit can quickly balance the pressure difference to prevent malfunction.

[0049] Specifically, a pressure reducing hole 4 is provided inside the first oil return port 12. One end of the pressure reducing hole 4 is connected to the first oil return port 12, and the other end of the pressure reducing hole 4 is connected to the second oil return port 13. A narrow channel 41 is formed inside the pressure reducing hole 4, and the corners of the pressure reducing hole 4 are all rounded.

[0050] Furthermore, the narrow channel 41 structure of the pressure reducing hole 4 creates a local throttling effect, resulting in a controllable pressure drop when the oil passes through, ensuring smooth oil return and avoiding cavitation caused by sudden pressure drops.

[0051] All corners are rounded to reduce flow resistance, eliminate the probability of turbulence and eddies, reduce noise and improve energy efficiency.

[0052] Furthermore, under the condition of internal leakage in the hydraulic motor, the pressure relief hole 4 can smoothly release abnormal pressure and protect system components.

[0053] In summary, this utility model adopts an integrated structure, which integrates pilot control, main valve core 21 and buffer structure into one unit, which not only simplifies the system layout, but also enhances the synergy of each component, enabling the overflow valve to achieve multi-functional control in a limited space, while also facilitating installation and maintenance.

[0054] By optimizing the structure, leakage points are reduced, the system sealing reliability is improved, the risk of internal leakage is reduced, the overall rigidity and impact resistance of the valve body are enhanced, and the system can maintain a stable seal under high pressure conditions.

[0055] By leveraging the pressure sensing of the pilot oil circuit and the linkage control of the main valve core 21, proactive prevention of internal leakage in the hydraulic motor is achieved. When the system pressure is abnormal, the pilot oil circuit responds quickly, pushing the main valve core 21 to precisely adjust the opening and release excess pressure in a timely manner. The buffer 3 can effectively absorb pressure fluctuations, avoiding water hammer effect and cavitation damage. On the one hand, it completely blocks the pressure runaway caused by internal leakage, and on the other hand, it significantly reduces the damage of hydraulic shock to the system, thereby improving the working reliability and service life of the hydraulic motor, while reducing energy loss and maintenance costs.

[0056] Working principle: When the hydraulic motor anti-internal leakage overflow valve of this utility model is working, the oil first passes through the pilot oil circuit formed by the main valve core 21 and the end cover 2501. The damping hole 2601 of the connecting ring 26 throttles the oil, forming a pilot control pressure to push the main valve core 21 to move. When the system pressure increases, the pressure signal of the pilot oil circuit causes the main valve core 21 to open against the force of the spring 23. The high-pressure oil flows into the return oil chamber through the gap between the main valve core 21 and the valve body. At the same time, the folding buffer 3 undergoes elastic deformation under the action of oil pressure to absorb the pressure impact. During the return oil process, the oil is throttled and depressurized when passing through the pressure reducing hole 4 with the narrow channel 41 structure. Finally, it is discharged from the first return oil port 12 and the second return oil port 13 respectively.

[0057] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A hydraulic motor anti-internal leakage relief valve comprising a main valve body (1), characterized in that: The main valve body (1) is provided with an oil inlet (11), a first oil return port (12), and a second oil return port (13). The main valve body (1) has an internal cavity (14). The main valve body (1) is provided with a pressure component (2). The main valve body (1) is provided with a connecting seat (15). A connecting rod (16) is rotatably connected to the connecting seat (15). The connecting rod (16) is used to adjust the pressure value of the pressure component (2). The pressure component (2) is provided with a buffer component (3). A pressure reducing hole (4) is provided in the first oil return port (12).

2. A hydraulic motor anti-internal leakage spill valve according to claim 1, wherein: The pressure component (2) includes a main valve core (21) and a piston (22), and a spring (23) is provided between the main valve core (21) and the piston (22).

3. The hydraulic motor anti-internal leakage overflow valve according to claim 2, characterized in that: One end of the connecting rod (16) is rotatably connected to the piston (22), and the other end of the connecting rod (16) is fixedly connected to a knob (24).

4. A hydraulic motor anti-internal leakage overflow valve according to claim 2, characterized in that: The main valve core (21) is arranged in an I-shape. One end of the main valve core (21) is provided with a plunger (25), which is slidably connected to the inner cavity (14). The other end of the main valve core (21) is provided with a connecting ring (26).

5. A hydraulic motor anti-internal leakage overflow valve according to claim 3, characterized in that: One end of the spring (23) is fixedly connected to the connecting ring (26), and the other end of the spring (23) is fixedly connected to the piston (22).

6. A hydraulic motor anti-internal leakage overflow valve according to claim 4, characterized in that: The plunger (25) is threaded with an end cap (2501), the buffer (3) is sleeved on the end cap (2501), the buffer (3) has a folded cavity (31) formed on it, and the buffer (3) is in contact with the inner cavity (14).

7. A hydraulic motor anti-internal leakage overflow valve according to claim 6, characterized in that: Both the end cap (2501) and the main valve core (21) are provided with through holes (27), and the connecting ring (26) is provided with damping holes (2601).

8. A hydraulic motor anti-internal leakage overflow valve according to claim 1, characterized in that: One end of the pressure reducing hole (4) is connected to the first oil return port (12), and the other end of the pressure reducing hole (4) is connected to the second oil return port (13). A narrow channel (41) is formed inside the pressure reducing hole (4), and the corners of the pressure reducing hole (4) are all rounded.

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