CN218509839U - Buffer overflow valve - Google Patents
Buffer overflow valve Download PDFInfo
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- CN218509839U CN218509839U CN202222839732.2U CN202222839732U CN218509839U CN 218509839 U CN218509839 U CN 218509839U CN 202222839732 U CN202222839732 U CN 202222839732U CN 218509839 U CN218509839 U CN 218509839U
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- guide sleeve
- oil passage
- valve core
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Abstract
A buffer overflow valve is characterized by comprising a threaded sleeve, a valve seat, a first guide sleeve, a second guide sleeve, a valve core, a screw plug and a spring, wherein the second guide sleeve can be slidably arranged on the inner wall of the first guide sleeve; the bottom is provided with an oil passage which can lead oil from the front end surface to the rear end surface of the inner cavity; the front end of the valve core is matched with the valve seat to control the on-off between the oil inlet and the oil outlet, the front end of the valve core radially extends to form a sliding part which can be in sliding fit with the inner wall of the screw sleeve, the rear end of the valve core is matched with the inner wall of the second guide sleeve, and the valve core radially has an oil guide channel which can guide oil to the front end face of the inner cavity of the second guide sleeve from the oil inlet. The whole structure can slow down the pressure flying and rising speed, the pressure rising is gentle, the pressure overshoot is eliminated, and the impact is avoided.
Description
Technical Field
The utility model relates to an overflow valve especially relates to an overflow valve with buffer function.
Background
The thread plug-in type buffer overflow valve is applied to an important hydraulic control system, and the main purpose of the thread plug-in type buffer overflow valve is to work smoothly, reduce impact and protect the safety of a device. In the modern mechanical equipment slewing device, a large number of hydraulic circuits with buffering function are applied, such as excavator slewing devices, crane slewing devices, high-altitude operation vehicle slewing devices, manipulator slewing devices, agricultural and forestry mechanical slewing devices, rocket carrying platforms, and other important work occasions, wherein a buffering overflow valve is a key hydraulic element of the system, and the performance of the buffering overflow valve directly influences the performance of a host machine. The existing buffer overflow valve is divided into a plate-type buffer overflow valve and a plug-in type buffer overflow valve according to a connection mode, and the plug-in type buffer overflow valve is generally adopted in a system in order to reduce installation space and improve system reliability. The existing plug-in type buffer overflow valve has the following defects: firstly, once the filter screen and the damping hole are seriously polluted and blocked, the damping is invalid, the rotation is weak, the pollutant cannot be removed, and only the damping plug can be replaced; secondly, the damping time is too long or too short, which causes incorrect angle of the buffer position, unstable pressure and damping of the host, damages the gear or the motor of the host and seriously affects the reliability of the host; thirdly, the valve parts have the characteristics of high manufacturing precision requirement, complex process requirement, high requirement on processing equipment and the like; finally, the fixed type is not adjustable, the requirements of users on different pressures cannot be met, and the fixed type can only be set in a factory.
As an improvement, a plurality of related patents are disclosed in the prior art, and reference is made to a thread-insertion adjustable buffer overflow valve (with the publication number of CN 202073860U) in a chinese utility model patent with the patent number of ZL201120187184.9, and reference is also made to a buffer overflow valve (with the publication number of CN 108150472B) in a chinese invention patent with the patent number of ZL 201711440825.5.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a compact structure, dependable performance's buffering overflow valve is provided in addition to foretell technical current situation.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a buffer overflow valve is characterized by comprising
The screw sleeve is axially hollow and provided with a front port, and an oil outlet is formed at the front end of the screw sleeve in the lateral direction;
the valve seat is arranged on the front end port of the threaded sleeve, is axially hollow and forms an oil inlet at the front end;
the first guide sleeve is arranged at the rear end of the inner cavity of the threaded sleeve;
the second guide sleeve can be arranged on the inner wall of the first guide sleeve in a sliding way; the bottom is provided with an oil passage which can lead oil from the front end surface to the rear end surface of the inner cavity;
the front end of the valve core is matched with the valve seat to control the on-off between the oil inlet and the oil outlet, the front end of the valve core radially extends to form a sliding part which can be in sliding fit with the inner wall of the screw sleeve, the rear end of the valve core is matched with the inner wall of the second guide sleeve, and the valve core radially has an oil guide channel which can guide oil from the oil inlet to the front end surface of the inner cavity of the second guide sleeve;
the screw plug is arranged at the tail end of the screw sleeve, and the front end surface of the screw plug can abut against the rear end surface of the second guide sleeve and can limit the second guide sleeve; and
and the spring is sleeved on the valve core, the front end of the spring is abutted against the sliding part, and the rear end of the spring acts on the front end surface of the second guide sleeve.
Preferably, the oil guide channel comprises a first axial oil passage, a first radial oil passage, an annular damping groove, a second radial oil passage and a second axial oil passage which are sequentially communicated, and the first axial oil passage is axially formed at the front end of the valve core; the annular damping groove is formed in the periphery of the middle of the valve element, the second axial oil passage is formed in the rear end of the valve element, the first radial oil passage is radially formed in the valve element, two ends of the first radial oil passage are communicated with the first axial oil passage and the annular damping groove, and the second radial oil passage is radially formed in the valve element, two ends of the second radial oil passage are communicated with the annular damping groove and the second axial oil passage. The anti-pollution capability is strong, the damping adjusting range is wide, and the applicability is wide.
Furthermore, a blocking ring for blocking oil stains is formed on the annular damping groove of the valve core.
Furthermore, a gasket is arranged on the front end face of the second guide sleeve, and the rear end of the spring abuts against the gasket.
The inner diameter of an oil inlet of the valve seat is larger than the inner diameter of the section of the tail end of the rear end of the valve core. The differential structure has the advantages of rapid opening and closing and quick response.
The oil outlet comprises a first oil outlet and a second oil outlet, and the sliding portion is located between the first oil outlet and the second oil outlet. The second oil outlet is a main overflow port, and the first oil outlet is used for discharging oil in the valve so as to avoid influencing the subsequent action of the valve.
Compared with the prior art, the utility model has the advantages of: along with the rise of the working pressure, the inlet oil passes through an oil guide channel of the valve core and reaches a front cavity and a rear cavity of the second guide sleeve, the second guide sleeve continuously pushes and presses the spring until the highest adjusting pressure is set, the buffer overflow valve slowly rises to the highest pressure from initial starting overflow in the continuous process, the range of the buffer overflow valve continuously changes, and the pressure lift range is smooth and has no overshoot; the sliding part of the front end of the valve core is matched with the inner wall of the screw sleeve, the rear end of the valve core is matched with the inner wall of the second guide sleeve in a sliding manner, and the front end and the rear end of the valve core are provided with guide matching structures, so that the valve core is opened gently, is small in vibration, low in noise, good in reliability and long in service life. The whole structure can slow down the pressure flying and rising speed, the pressure rising is gentle, the pressure overshoot is eliminated, and the impact is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment.
Fig. 2 is an enlarged view of the combination of the second guide sleeve and the valve core in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 and fig. 2, the flood buffer overflow valve of the present embodiment includes a threaded sleeve 1, a valve seat 2, a first guide sleeve 4, a second guide sleeve 5, a valve core 3, a threaded plug 6 and a spring 7.
The screw sleeve 1 is hollow in the axial direction and is provided with a front port, and an oil outlet is formed in the lateral direction of the front end of the screw sleeve 1; the oil outlet comprises a first oil outlet 1b and a second oil outlet 2b, the second oil outlet 2b is a main overflow port, and the first oil outlet 1b is used for discharging oil in the valve so as to avoid influencing the subsequent action of the valve.
The valve seat 2 is arranged on the front end port of the threaded sleeve 1, the valve seat 2 is axially hollow, and an oil inlet 1a is formed at the front end of the valve seat 2; the first guide sleeve 4 is arranged at the rear end of the inner cavity of the screw sleeve 1; the second guide sleeve 5 can be arranged on the inner wall of the first guide sleeve 4 in a sliding way; the bottom of the guide sleeve is provided with an oil passage 51 which can lead oil from the front end surface of the inner cavity to the rear end surface, and the rear end surface of the second guide sleeve 4 is concave so as to accumulate the oil.
The front end of the valve core 3 is matched with the valve seat 2 to control the on-off between the oil inlet 1a and the oil outlet, the front end of the valve core 3 radially extends to form a sliding part 31 which can be in sliding fit with the inner wall of the screw sleeve 1, the rear end of the valve core is matched with the inner wall of the second guide sleeve 5, and the valve core 3 radially has an oil guide channel which can guide oil from the oil inlet 1a to the front end face of the inner cavity of the second guide sleeve 5; the sliding portion 31 is located between the first oil outlet 1b and the second oil outlet 2 b. Referring to fig. 2, the oil guide passage in this embodiment includes a first axial oil passage 32, a first radial oil passage 33, an annular damping groove 34, a second radial oil passage 35, and a second axial oil passage 36, which are sequentially communicated, and the first axial oil passage 32 is axially formed at the front end of the valve element 3; an annular damping groove 34 is formed in the outer periphery of the middle of the valve spool 3, a second axial oil passage 36 is formed in the rear end of the valve spool 3, a first radial oil passage 33 is radially formed on the valve spool 3 and has both ends communicating the first axial oil passage 32 and the annular damping groove 34, and a second radial oil passage 35 is radially formed on the valve spool 3 and has both ends communicating the annular damping groove 34 and the second axial oil passage 36. The valve core 3 is positioned on the annular damping groove 34 and is formed with a blocking ring 37 for blocking oil stains.
The screw plug 6 is arranged at the tail end of the screw sleeve 1, and the front end surface of the screw plug 6 can abut against the rear end surface of the second guide sleeve 5 and can limit the second guide sleeve 5; the spring 7 is sleeved on the valve core 3, the front end of the spring abuts against the sliding part 31, and the rear end of the spring acts on the front end surface of the second guide sleeve 5.
In this embodiment, a gasket 71 is disposed on the front end surface of the second guide sleeve 5, and the rear end of the spring 7 abuts against the gasket 71. The inner diameter of an oil inlet 1a of the valve seat 2 is larger than the inner diameter of the tail end section of the rear end of the valve core 3, so that differential motion can be realized.
Along with the rise of the working pressure, the inlet oil liquid reaches the front end of the inner cavity of the second guide sleeve through the oil guide channel of the valve core, then reaches the rear end face of the second guide sleeve through the oil passing channel, the second guide sleeve continuously pushes and presses the spring until the highest adjusting pressure is set, the buffer overflow valve slowly rises to the highest pressure from the initial starting overflow in the continuous process, the pressure range continuously changes in the interval range, and the pressure lift range is gentle and free of overshoot.
Claims (6)
1. A buffer overflow valve is characterized by comprising
The screw sleeve (1) is hollow in the axial direction and provided with a front port, and an oil outlet is formed at the lateral direction of the front end of the screw sleeve (1);
the valve seat (2) is arranged on the front end port of the threaded sleeve (1), the valve seat (2) is axially hollow, and an oil inlet (1 a) is formed at the front end of the valve seat;
the first guide sleeve (4) is arranged at the rear end of the inner cavity of the threaded sleeve (1);
the second guide sleeve (5) can be arranged on the inner wall of the first guide sleeve (4) in a sliding way; the bottom is provided with an oil passage (51) which can lead oil from the front end surface to the rear end surface of the inner cavity;
the front end of the valve core (3) is matched with the valve seat (2) to control the on-off between the oil inlet (1 a) and the oil outlet, the front end of the valve core (3) radially extends to form a sliding part (31) which can be in sliding fit with the inner wall of the screw sleeve (1), the rear end of the valve core is matched with the inner wall of the second guide sleeve (5), and the valve core (3) radially has an oil guide channel which can guide oil to the front end face of the inner cavity of the second guide sleeve (5) from the oil inlet (1 a);
the screw plug (6) is arranged at the tail end of the screw sleeve (1), and the front end face of the screw plug (6) can be abutted against the rear end face of the second guide sleeve (5) and can limit the second guide sleeve (5); and
and the spring (7) is sleeved on the valve core (3), the front end of the spring is abutted against the sliding part (31), and the rear end of the spring acts on the front end surface of the second guide sleeve (5).
2. The buffer overflow valve according to claim 1, wherein the oil guide passage comprises a first axial oil passage (32), a first radial oil passage (33), an annular damping groove (34), a second radial oil passage (35) and a second axial oil passage (36) which are sequentially communicated, and the first axial oil passage (32) is axially formed at the front end of the valve core (3); the annular damping groove (34) is formed in the periphery of the middle of the valve element (3), the second axial oil passage (36) is formed in the rear end of the valve element (3), the first radial oil passage (33) is formed on the valve element (3) in the radial direction, two ends of the first radial oil passage are communicated with the first axial oil passage (32) and the annular damping groove (34), and the second radial oil passage (35) is formed on the valve element (3) in the radial direction, and two ends of the second radial oil passage are communicated with the annular damping groove (34) and the second axial oil passage (36).
3. The buffer overflow valve according to claim 2, characterized in that the valve core (3) is provided with a blocking ring (37) formed on the annular damping groove (34) for blocking oil stains.
4. The buffer overflow valve according to claim 1 is characterized in that a gasket (71) is arranged on the front end surface of the second guide sleeve (5), and the rear end of the spring (7) is abutted against the gasket (71).
5. The buffer overflow valve according to claim 1, characterized in that the inner diameter of the oil inlet (1 a) of the valve seat (2) is larger than the inner diameter of the tail end section of the rear end of the valve core (3).
6. The surge relief valve according to claim 1 wherein said outlet port comprises a first outlet port (1 b) and a second outlet port (2 b), said sliding portion (31) being located between the first outlet port (1 b) and the second outlet port (2 b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222839732.2U CN218509839U (en) | 2022-10-26 | 2022-10-26 | Buffer overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222839732.2U CN218509839U (en) | 2022-10-26 | 2022-10-26 | Buffer overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218509839U true CN218509839U (en) | 2023-02-21 |
Family
ID=85217645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222839732.2U Active CN218509839U (en) | 2022-10-26 | 2022-10-26 | Buffer overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218509839U (en) |
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2022
- 2022-10-26 CN CN202222839732.2U patent/CN218509839U/en active Active
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