Buffering overflow valve

Abstract

The invention relates to the technical field of hydraulic valves, and discloses a buffer overflow valve which comprises a shell, a first sealing ring is arranged on the surface of the shell, a connecting block is fixedly connected to the right end of the shell, an adjusting assembly is arranged in the connecting block, and a storage assembly is fixedly connected to the side, close to the shell, of the adjusting assembly. A moving assembly is arranged in the storage assembly, a spring is arranged between the storage assembly and the moving assembly, the adjusting assembly comprises a threaded rod, the surface of the threaded rod is in threaded connection with a connecting block, and the surface of the threaded rod is in threaded connection with a locking nut. A closed cavity is formed between a connecting column and a fixing seat, a second sealing ring is used for sealing, a valve element and an oil way in the connecting column are communicated with the closed cavity, the cavity is filled with oil, and when the oil on the left side of the valve element rises, due to the existence of the oil in the closed cavity, the valve element cannot instantly leave a valve seat at the bottom of a valve block; therefore, the buffer overflow valve can be opened at low pressure, and pressure impact cannot be generated.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve technology, specifically to a buffer relief valve. Background Technology

[0002] The relief valve is a key component in a hydraulic system used to control pressure. When the pressure in the hydraulic system exceeds the threshold set by the spring, the valve core opens, allowing excess oil to overflow back to the oil tank, thereby maintaining stable system pressure. In fields such as engineering machinery, relief valves are usually installed in the hydraulic circuit to control system pressure, ensure that hydraulic equipment operates within a safe pressure range, and guarantee the normal operation of the system.

[0003] Construction machinery experiences significant pressure shocks during rotation and start-up. Traditional relief valves cannot effectively buffer the movement of the valve core, leading to a sudden increase in system pressure. The large inertia during rotation and start-up results in large pressure shocks, causing mechanical shaking, poor user experience, and damage to components. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a buffer overflow valve, which solves the problem of damage to components caused by the large inertia of traditional overflow valves during the start-up and shutdown of engineering machinery.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a buffer overflow valve, comprising a housing, a first sealing ring being provided on the surface of the housing, a connecting block being fixedly connected to the right end of the housing, an adjusting component being provided inside the connecting block, a storage component being fixedly connected to the adjusting component near the housing, a moving component being provided inside the storage component, and a spring being provided between the storage component and the moving component.

[0006] By adopting the above technical solution, the adjusting component moves the storage component via the threaded rod, compressing or releasing the spring to adjust the set pressure; the spring between the storage component and the moving component provides preload during pressure shock, which works in conjunction with the damping force of the closed cavity oil to slow down the opening speed of the valve core, allowing the buffer overflow valve to open smoothly at a lower pressure and eliminate pressure shock; the valve core of the moving component is sealed to the valve seat through a conical surface, and after the pressure shock is eliminated, the elastic force of the spring pushes the valve core to reset.

[0007] Preferably, the adjusting component includes a threaded rod, the surface of which is threadedly connected to the connecting block, a locking nut is threadedly connected to the surface of the threaded rod, a connecting groove is provided at the end of the threaded rod away from the outer casing, and the end of the threaded rod near the outer casing passes through and extends into the interior of the outer casing.

[0008] Preferably, the storage component includes a fixed base, which is fixedly connected to a threaded rod. The fixed base has a closed cavity inside and is slidably connected to the inner wall of the outer shell.

[0009] Preferably, the moving component includes a connecting column, which is slidably connected to the storage component. A valve core is fixedly connected to the end of the connecting column away from the fixed base, and a retaining ring is fixedly connected to the surface of the valve core.

[0010] Preferably, the surface of the connecting column is provided with a second sealing ring, and the surface of the second sealing ring is in close contact with the inner wall of the fixing seat.

[0011] Preferably, one end of the spring is fixedly connected to the fixed base, and the other end of the spring is fixedly connected to the fixed ring.

[0012] Preferably, the end of the valve core away from the outer casing is a tapered surface, and the end of the valve core away from the outer casing contacts the valve seat to form a seal.

[0013] Preferably, both the valve core and the connecting column have oil passages inside, and the two oil passages are interconnected.

[0014] Preferably, the method of using the buffer overflow valve includes the following steps: The user installs this buffer overflow valve on the two oil ports of the motor and connects it directly to the hydraulic circuit of the rotary mechanism; The user rotates the threaded rod to move the fixed seat axially, compressing or releasing the spring, changing the spring's preload on the valve core, setting the opening pressure threshold of the buffer relief valve, and then fixing the threaded rod with the lock nut after adjustment. Under the action of the spring, the conical surface of the valve core is tightly sealed to the valve seat. At this time, the hydraulic oil in the hydraulic circuit cannot overflow. The closed cavity between the connecting column and the fixed seat is filled with oil through the oil passage inside the valve core and the connecting column, forming a sealed buffer space. When the construction machinery starts or stops rotating, the pressure at the motor oil port rises sharply. The oil pressure pushes the valve core to move against the spring preload. The conical surface gradually separates from the valve seat. The hydraulic circuit oil overflows into the hydraulic circuit through the gap between the valve core and the valve seat, releasing the excessive pressure. The oil in the closed cavity generates a damping force to slow down the opening speed of the valve core. After the pressure shock is eliminated, the spring elastic force pushes the valve core to the left to reset, the conical surface re-seals the valve seat, the overflow stops, and the whole system returns to normal working condition.

[0015] Preferably, when the valve core moves to the right, the volume of the closed cavity decreases, and the oil is discharged through the oil passage inside the valve core and connecting column. The oil flow resistance generates a damping force, which slows down the speed at which the valve core detaches from the valve seat.

[0016] Working principle: After the user installs the buffer relief valve on the motor oil port and connects it to the hydraulic circuit, the fixed seat is moved by rotating the threaded rod to compress or relax the spring. The preload on the valve core is adjusted to set the opening pressure threshold, and then the valve core is fixed with the lock nut. Under the action of the spring, the valve core seals with the valve seat with a conical surface. At this time, the closed cavity between the connecting column and the fixed seat is filled with oil through the oil passage inside the valve core and the connecting column to form a buffer space. When the pressure at the motor oil port rises suddenly, the oil pressure pushes the valve core to overcome the spring preload, and its conical surface gradually separates from the valve seat. The oil overflows through the gap to release pressure. At the same time, the oil in the closed cavity is incompressible and its flow through the oil passage is restricted, generating a damping force to slow down the opening speed of the valve core and avoid pressure shock. After the pressure is eliminated, the spring pushes the valve core to reset and seal.

[0017] This invention provides a buffer overflow valve. It has the following beneficial effects: 1. In this invention, a closed cavity is formed between the connecting column and the fixed seat, and sealed by the second sealing ring. The oil passage inside the valve core and the connecting column is connected to the closed cavity, so that the cavity is filled with oil. When the oil on the left side of the valve core rises, the valve core will not leave the bottom valve seat of the valve block instantly because of the presence of oil inside the closed cavity. This allows the buffer overflow valve to open at a lower pressure without generating pressure shock.

[0018] 2. In this invention, the fixed seat is moved by rotating the threaded rod, thereby controlling the spring compression to adjust the set pressure of the buffer overflow valve. The position of the threaded rod is fixed by locking the nut to prevent the spring compression from changing due to vibration and other factors, ensuring that the set pressure of the overflow valve is stable and reliable. This allows for flexible adjustment of the overflow pressure according to different working conditions, enabling the buffer overflow valve to adapt to the pressure protection needs of various engineering machinery.

[0019] 3. In this invention, by installing the buffer overflow valve on the two oil ports of the motor and directly connecting it to the hydraulic circuit of the slewing mechanism, when the slewing mechanism starts or stops, causing a sudden increase in the oil pressure of the motor, the buffer overflow valve responds immediately through the closed cavity buffering mechanism, suppressing the transmission of impact to the hydraulic system and mechanical structure, effectively protecting the slewing structural components and the motor, reducing wear and leakage failures caused by impact, and extending the service life of components. Attached Figure Description

[0020] Figure 1 This is a perspective view of the buffer overflow valve of the present invention; Figure 2 This is a schematic cross-sectional view of the outer casing of the buffer overflow valve of the present invention; Figure 3 This is a schematic diagram of the oil circuit of the buffer overflow valve of the present invention; Figure 4 This is a schematic diagram of the closed cavity of the buffer overflow valve of the present invention; Figure 5This is a schematic diagram of the second sealing ring of the buffer overflow valve of the present invention; Figure 6 This is an exploded view of the buffer overflow valve of the present invention.

[0021] The components are as follows: 1. Outer shell; 2. Moving component; 201. Valve core; 202. Fixing ring; 203. Oil passage; 204. Connecting column; 3. Spring; 4. Adjusting component; 401. Threaded rod; 402. Locking nut; 403. Connecting groove; 5. First sealing ring; 6. Connecting block; 7. Storage component; 701. Fixing seat; 702. Enclosed cavity; 8. Second sealing ring. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 - Appendix Figure 3 The present invention provides a buffer overflow valve, including a housing 1, a first sealing ring 5 on the surface of the housing 1, a connecting block 6 fixedly connected to the right end of the housing 1, an adjusting component 4 inside the connecting block 6, a storage component 7 fixedly connected to the adjusting component 4 near the side of the housing 1, a moving component 2 inside the storage component 7, and a spring 3 between the storage component 7 and the moving component 2.

[0024] Specifically, the outer casing 1 provides mounting support for the internal components and ensures external sealing through the first sealing ring 5 on the surface to prevent oil leakage and ensure the normal working environment of the valve. Through the oil passage 203 inside the valve core 201 and the connecting column 204, an oil buffering mechanism is formed with the fixed seat 701 and the closed cavity 702, so that the valve core 201 will not leave the valve seat instantly, realizing the overflow opening at a lower pressure and eliminating the impact. After the pressure impact is eliminated, the spring 3 uses its own elastic force to push the valve core 201 to reset, ensuring that the overflow valve returns to the sealing state and maintains the normal operation of the system. Through the synergistic effect of the spring 3 and the oil damping force of the closed cavity 702, effective buffering of pressure impact and stable control of system pressure are achieved.

[0025] See appendix Figure 2 and attached Figure 4 The adjusting component 4 includes a threaded rod 401, the surface of the threaded rod 401 is threadedly connected to the connecting block 6, a locking nut 402 is threadedly connected to the surface of the threaded rod 401, a connecting groove 403 is provided at the end of the threaded rod 401 away from the outer shell 1, and the end of the threaded rod 401 near the outer shell 1 passes through and extends into the interior of the outer shell 1.

[0026] Specifically, the user rotates the threaded rod 401, causing axial movement within the connecting block 6. The threaded rod 401 drives the fixed seat 701 to move. Since the valve core 201 is always in contact with the valve seat, the spring 3 is compressed or released. By changing the compression of the spring 3, the set pressure of the buffer relief valve is adjusted. After adjustment, the locking nut 402 is tightened along the thread on the surface of the threaded rod 401, so that it abuts against the connecting block 6 to fix the position of the threaded rod 401, preventing the compression of the spring 3 from changing due to vibration or other factors. The connecting groove 403 allows the user to rotate the threaded rod 401 with tools. The cooperation between the threaded rod 401 and the locking nut 402 achieves flexible adjustment and stable fixation of the pressure, ensuring that the buffer relief valve can accurately open the relief valve at the set pressure under different working conditions, effectively suppressing pressure shock.

[0027] See appendix Figure 3 - Appendix Figure 5 The storage component 7 includes a fixed base 701, which is fixedly connected to the threaded rod 401. The fixed base 701 has a closed cavity 702 inside, and the fixed base 701 is slidably connected to the inner wall of the outer shell 1.

[0028] Specifically, the fixed seat 701 is connected to the internal oil passage 203 of the valve core 201 and forms a closed cavity 702 with the valve core 201 through the second sealing ring 8. When the oil pressure of the motor oil port acts on the left side of the valve core 201, the oil in the closed cavity 702 is incompressible and its flow through the right oil passage 203 of the valve core 201 is restricted, generating a damping force to delay the speed at which the valve core 201 leaves the valve seat, so that the buffer overflow valve opens the overflow at a lower pressure. Together with the spring 3 and the closed cavity 702, the pressure shock is buffered and the pressure is stabilized and controlled.

[0029] See appendix Figure 4 and attached Figure 5 The moving component 2 includes a connecting post 204, which is slidably connected to the storage component 7. A valve core 201 is fixedly connected to the end of the connecting post 204 away from the fixed base 701, and a fixing ring 202 is fixedly connected to the surface of the valve core 201.

[0030] Specifically, when the user moves the fixed seat 701 by the threaded rod 401, the connecting column 204 moves axially accordingly. The fixing ring 202 on the surface of the valve core 201 limits its relative position with the valve seat, ensuring accurate positioning in a sealed state. When the oil pressure at the motor port acts on the left side of the valve core 201, the pressure is transmitted to the closed cavity 702 through the connecting column 204. The oil in the closed cavity 702 is slowly discharged through the small hole inside the valve core 201, generating a damping force to slow down the speed at which the valve core 201 separates from the valve seat, so that the buffer relief valve opens smoothly with a lower pressure to ensure the smooth operation of the hydraulic system when the construction machinery rotates and stops.

[0031] See appendix Figure 5 and attached Figure 6 A second sealing ring 8 is provided on the surface of the connecting column 204, and the surface of the second sealing ring 8 is tightly fitted with the inner wall of the fixing seat 701.

[0032] Specifically, when the user moves the fixed seat 701 by the threaded rod 401 to adjust the compression of the spring 3, the connecting column 204 moves axially due to its sliding connection with the fixed seat 701. The second sealing ring 8 on the surface of the connecting column 204 moves synchronously with the connecting column 204 and always fits tightly against the inner wall of the fixed seat 701, ensuring that the closed cavity 702 inside the fixed seat 701 is always sealed. When the oil pressure at the motor oil port acts on the left side of the valve core 201, the oil enters the closed cavity 702 through the small hole inside the valve core 201. Due to the sealing effect of the second sealing ring 8, the oil in the closed cavity 702 cannot leak and can only be slowly discharged through the small hole at the tail of the valve core 201, thereby generating a damping force to slow down the opening speed of the valve core 201, so that the buffer overflow valve overflows smoothly at a lower pressure. The second sealing ring 8 ensures that the oil always flows through the oil passage 203 during the movement of the valve core 201, avoiding buffer failure due to leakage, and ensuring that the buffer overflow valve can effectively suppress pressure shock under different working conditions.

[0033] See appendix Figure 2 One end of the spring 3 is fixedly connected to the fixed base 701, and the other end of the spring 3 is fixedly connected to the fixed ring 202.

[0034] Specifically, the two ends of the spring 3 are fixedly connected to the fixed seat 701 and the fixed ring 202 respectively. The compression of the spring 3 can be adjusted by moving the fixed seat 701, thereby changing the preload on the valve core 201 and realizing flexible adjustment of the set pressure of the buffer relief valve. The fixed ring 202 provides a reverse support point for the spring 3, ensuring that the elastic force is stably transmitted to the valve core 201. This allows the valve core 201 to accurately control the relief opening pressure under the state of balance between the oil pressure and the elastic force of the spring 3, ensuring the convenience of pressure adjustment. Furthermore, the elastic deformation characteristics of the spring 3 realize the reset control of the valve core 201, ensuring that the valve core 201 closes in time after the impact is eliminated, maintaining the normal operation of the system, and avoiding pressure setting failure due to loosening, thus ensuring the stability and reliability of the buffer relief valve under complex working conditions.

[0035] See appendix Figure 1 The end of the valve core 201 away from the outer casing 1 is a tapered surface, and the end of the valve core 201 away from the outer casing 1 contacts the valve seat to form a seal.

[0036] Specifically, under the preload of spring 3, valve core 201 maintains its initial position, ensuring that the tapered surface at its left end is in close contact with the valve seat to form a seal, preventing oil leakage from the motor port. When the oil pressure at the motor port rises and exceeds the set pressure of spring 3, the oil pressure pushes valve core 201 to overcome the elastic force of spring 3 and move away from the valve seat. The tapered surface gradually separates from the valve seat, and the oil at the motor port overflows through the gap between valve core 201 and the valve seat, releasing excessive pressure and achieving a buffering function. After the pressure shock is eliminated, the elastic force of spring 3 pushes valve core 201 to reset, and the tapered surface contacts the valve seat again to seal, maintaining stable system pressure. The tapered surface design provides a larger sealing specific pressure, enhancing sealing reliability. At the same time, during opening, the gradual separation of the tapered surface controls the oil overflow speed, avoiding instantaneous high-pressure shocks and ensuring that the buffer relief valve accurately responds to pressure changes and effectively suppresses shocks.

[0037] See appendix Figure 3 and attached Figure 4 Both the valve core 201 and the connecting column 204 have oil passages 203 inside, and the two oil passages 203 are interconnected.

[0038] Specifically, after the user sets the pressure of spring 3 by adjusting component 4, the conical surface of valve core 201 seals with the valve seat. When the pressure at the motor oil port increases, the oil enters the oil passage 203 of connecting column 204 through the internal oil passage 203 of valve core 201. Since the two oil passages 203 are connected, the oil fills the closed cavity 702 between the fixed seat 701 and valve core 201, forming a damping buffer, delaying the opening speed of valve core 201, so that the overflow valve opens smoothly at a lower pressure, avoiding impact. After the pressure drops, spring 3 resets valve core 201. Oil passage 203 ensures smooth oil flow and maintains the buffer medium in closed cavity 702, so that pressure shock is effectively suppressed through oil transmission and damping effect, ensuring the stability of valve core 201 response and the reliability of buffering effect, and realizing stable pressure control during the start and stop of engineering machinery rotation.

[0039] The method for using a buffer overflow valve includes the following steps: The user installs this buffer overflow valve on the two oil ports of the motor and connects it directly to the hydraulic circuit of the rotary mechanism; The user rotates the threaded rod 401 to drive the fixed seat 701 to move axially, compressing or releasing the spring 3, changing the preload of the spring 3 on the valve core 201, setting the opening pressure threshold of the buffer overflow valve, and then fixing the threaded rod 401 with the lock nut 402 after adjustment. Under the action of spring 3, the conical surface of valve core 201 is tightly sealed with valve seat. At this time, hydraulic circuit oil cannot overflow. The closed cavity 702 between connecting column 204 and fixed seat 701 is filled with oil through oil passage 203 inside valve core 201 and connecting column 204, forming a sealed buffer space. When the construction machinery starts or stops rotating, the pressure at the motor oil port rises sharply. The oil pressure pushes the valve core 201 to move against the preload of the spring 3. The conical surface gradually separates from the valve seat. The hydraulic circuit oil overflows into the hydraulic circuit through the gap between the valve core 201 and the valve seat, releasing the excessive pressure. The oil in the closed cavity 702 generates a damping force to slow down the opening speed of the valve core 201. After the pressure shock is eliminated, the elastic force of spring 3 pushes valve core 201 to the left to reset, the conical surface re-seals with the valve seat, the overflow stops, and the whole system returns to normal working condition.

[0040] When the valve core 201 moves to the right, the volume of the closed cavity 702 decreases, and the oil is discharged through the oil passage 203 inside the valve core 201 and the connecting column 204. The oil flow resistance generates a damping force, which slows down the speed at which the valve core 201 separates from the valve seat.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buffer overflow valve, comprising a housing (1), characterized in that, The outer shell (1) is provided with a first sealing ring (5), and a connecting block (6) is fixedly connected to the right end of the outer shell (1). An adjustment component (4) is provided inside the connecting block (6). A storage component (7) is fixedly connected to the side of the adjustment component (4) near the outer shell (1). A moving component (2) is provided inside the storage component (7). A spring (3) is provided between the storage component (7) and the moving component (2).

2. The buffer overflow valve according to claim 1, characterized in that, The adjustment component (4) includes a threaded rod (401), the surface of the threaded rod (401) is threadedly connected to the connecting block (6), a locking nut (402) is threadedly connected to the surface of the threaded rod (401), a connecting groove (403) is provided at the end of the threaded rod (401) away from the outer shell (1), and the end of the threaded rod (401) near the outer shell (1) penetrates and extends into the interior of the outer shell (1).

3. The buffer overflow valve according to claim 1, characterized in that, The storage component (7) includes a fixed base (701), which is fixedly connected to a threaded rod (401). A closed cavity (702) is provided inside the fixed base (701), and the fixed base (701) is slidably connected to the inner wall of the outer shell (1).

4. The buffer overflow valve according to claim 1, characterized in that, The moving component (2) includes a connecting post (204), which is slidably connected to the storage component (7). A valve core (201) is fixedly connected to one end of the connecting post (204) away from the fixed seat (701), and a fixing ring (202) is fixedly connected to the surface of the valve core (201).

5. The buffer overflow valve according to claim 4, characterized in that, The surface of the connecting column (204) is provided with a second sealing ring (8), and the surface of the second sealing ring (8) is in close contact with the inner wall of the fixing seat (701).

6. The buffer overflow valve according to claim 1, characterized in that, One end of the spring (3) is fixedly connected to the fixed base (701), and the other end of the spring (3) is fixedly connected to the fixed ring (202).

7. The buffer overflow valve according to claim 4, characterized in that, The valve core (201) has a tapered surface at the end away from the outer shell (1), and the valve core (201) at the end away from the outer shell (1) contacts the valve seat to form a seal.

8. The buffer overflow valve according to claim 4, characterized in that, Both the valve core (201) and the connecting column (204) have oil passages (203) inside, and the two oil passages (203) are interconnected.

9. The method of using a buffer overflow valve, characterized in that, For the buffer overflow valve according to any one of claims 1-8, the method comprises the following steps: The user installs this buffer overflow valve on the two oil ports of the motor and connects it directly to the hydraulic circuit of the rotary mechanism; The user rotates the threaded rod (401) to drive the fixed seat (701) to move axially, compress or release the spring (3), change the preload of the spring (3) on the valve core (201), set the opening pressure threshold of the buffer overflow valve, and fix the threaded rod (401) with the lock nut (402) after adjustment. Under the action of the spring (3), the conical surface of the valve core (201) is tightly sealed with the valve seat. At this time, the hydraulic circuit oil cannot overflow. The closed cavity (702) between the connecting column (204) and the fixed seat (701) is filled with oil through the oil passage (203) inside the valve core (201) and the connecting column (204), forming a sealed buffer space. When the construction machinery starts or stops rotating, the pressure at the motor oil port rises sharply. The oil pressure pushes the valve core (201) to move against the preload of the spring (3). The conical surface gradually separates from the valve seat. The hydraulic circuit oil overflows into the hydraulic circuit through the gap between the valve core (201) and the valve seat, releasing the excessive pressure. The oil in the closed cavity (702) generates a damping force to slow down the opening speed of the valve core (201). After the pressure shock is eliminated, the elastic force of the spring (3) pushes the valve core (201) to the left to reset, the conical surface re-seals the valve seat, the overflow stops, and the whole thing returns to normal working condition.

10. The method of using the buffer overflow valve according to claim 9, characterized in that: When the valve core (201) moves to the right, the volume of the closed cavity (702) decreases, and the oil is discharged through the oil passage (203) inside the valve core (201) and the connecting column (204). The oil flow resistance generates a damping force, which slows down the speed at which the valve core (201) leaves the valve seat.

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