CN210240160U - Threaded plug-in type pilot supercharging two-stage overflow valve - Google Patents
Threaded plug-in type pilot supercharging two-stage overflow valve Download PDFInfo
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- CN210240160U CN210240160U CN201921105613.6U CN201921105613U CN210240160U CN 210240160 U CN210240160 U CN 210240160U CN 201921105613 U CN201921105613 U CN 201921105613U CN 210240160 U CN210240160 U CN 210240160U
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Abstract
A thread plug-in type pilot pressurizing two-stage overflow valve is characterized by comprising a main valve sleeve, a main valve core, a pilot valve seat, a slide valve core, a pilot valve core, a pressure regulating valve sleeve, a push rod, a piston and a connecting sleeve, wherein the main valve sleeve is axially hollow, a first oil port is formed at the front end of the main valve sleeve, and a second oil port is formed in the side wall of the main valve sleeve; the main valve core is movably arranged in the main valve sleeve and used for controlling the on-off of the first oil port and the second oil port; the front end of the pilot valve seat is hermetically arranged at the rear end of the main valve core, and a first oil cavity is formed between the pilot valve seat and the main valve core; the spool is arranged on the main spool and is provided with a first oil passage in the middle for connecting a first oil cavity and a first oil port. The utility model discloses it is high to adjust the precision, and it is good to adjust the linearity to have one-way oil supplementation and guide's pressure boost function, realize the accurate restriction control of load pressure, ensure hydraulic system safe operation's purpose.
Description
Technical Field
The utility model relates to an overflow valve belongs to hydraulic control valve technical field, mainly is applied to and removes hydraulic system.
Background
The mobile hydraulic technology is mainly applied to vehicles, machines and equipment which move outdoors by self. The movable hydraulic component is an important component of a movable hydraulic technology, has a light, small and compact structure, has strict limits on weight and volume, has high power density requirement, generally adopts a threaded plug-in mounting mode, and integrates various components on the same valve body; the load uncertainty of the mobile hydraulic machinery is strong, and is mainly reflected in severe system pressure fluctuation, so that the requirements of the components in the aspects of allowable peak pressure, continuous working pressure, service life, control precision and the like are obviously different from those of industrial hydraulic components; the power of the mobile hydraulic system usually comes from movable energy sources such as an internal combustion engine and a storage battery, so that the power matching between an operation load and the energy sources is very emphasized, and the current pilot overflow valve cannot meet the requirement of short-time heavy-load working conditions in a load spectrum.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a stable screw thread cartridge formula guide pressure boost second grade overflow valve of regulated pressure is provided to foretell technical current situation.
The utility model discloses still another technical problem that will solve provides a screw thread cartridge formula guide pressure boost second grade overflow valve of second grade pressure setting function to foretell technical current situation.
The utility model discloses still another technical problem that will solve provides a screw thread cartridge formula guide pressure boost second grade overflow valve of one-way oil supplementation to foretell technical situation.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a thread plug-in type pilot supercharging two-stage overflow valve is characterized by comprising
The main valve sleeve is axially hollow, a first oil port is formed at the front end of the main valve sleeve, and a second oil port is formed on the side wall of the main valve sleeve;
the main valve core is movably arranged in the main valve sleeve and used for controlling the connection and disconnection of the first oil port and the second oil port;
the front end of the pilot valve seat is hermetically arranged at the rear end of the main valve core, a first oil cavity is formed between the pilot valve seat and the main valve core, and a pilot oil port communicated with the second oil port is formed in the lateral direction of the pilot valve seat;
the sliding valve core is arranged on the main valve core, and a first oil channel for connecting a first oil cavity and a first oil port is arranged in the middle of the sliding valve core;
the first spring is arranged at two ends in the first oil cavity and is respectively abutted against the main valve core and the pilot valve seat;
the second spring is arranged at two ends in the first oil cavity and is respectively abutted against the sliding valve core and the pilot valve seat;
the pilot valve core is arranged on the pilot valve seat, the front end of the pilot valve core extends into the first oil cavity, and the pilot oil port is communicated with the first oil cavity under the state that the pilot valve core is separated from the pilot valve seat;
the pressure regulating valve sleeve is hollow in the axial direction, and the front end of the pressure regulating valve sleeve is hermetically arranged at the rear end of the pilot valve seat;
the push rod is arranged in the pressure regulating valve sleeve in an axially movable manner;
the connecting sleeve is arranged at the rear end of the pressure regulating valve sleeve and axially forms a third oil port, and a movable cavity is formed between the front end of the connecting sleeve and the pressure regulating valve sleeve;
the piston can be axially movably arranged in the movable cavity, and the front end surface can drive the push rod to move forwards; and
and the third spring is arranged in the pressure regulating valve sleeve and always forces the push rod to keep away from the pilot valve core.
Furthermore, the outer wall of the connecting sleeve is provided with a limiting nut for limiting the pressure regulating valve sleeve.
Further, the outer wall of the pressure regulating valve sleeve is provided with a splicing cap used for limiting the pilot valve seat.
The push rod is provided with an annular groove, the pressure regulating valve sleeve is provided with an airflow channel communicated with the atmosphere, the airflow channel is provided with the splicing cap on the port of the outer wall of the pressure regulating valve sleeve, and the airflow channel is communicated with the annular groove at the port of the inner wall of the pressure regulating valve sleeve. The air flow channel is communicated with the atmosphere, so that the air in the annular groove is kept at the same temperature with the atmosphere in the operation process, the operation is prevented from being interfered, the precision is reduced, meanwhile, the annular groove can reduce the friction force between the push rod and the inner wall of the pressure regulating valve sleeve, certain air damping can be formed due to the air in the annular groove, the stability and the sensitivity of a product are improved, and the split cap also has the function of preventing foreign matters from entering the air flow channel.
Preferably, the pressure regulating valve sleeve comprises a wide flared part and an extension part extending forwards from the flared part, the flared part and the front end of the connecting sleeve form a movable cavity, and the extension part is connected and assembled with the pilot valve core.
Compared with the prior art, the utility model has the advantages of: the utility model discloses satisfy the heavy load operating mode requirement of short-term in the load spectrum, energy power specification need not increase to improve equipment's economic nature and practicality, reinforcing equipment competitiveness. The hydraulic control system has the advantages of compact integral structure, stable regulation pressure, high steady-state precision, large overflow flow, fast dynamic response, small overshoot, high regulation precision, good regulation linearity, unidirectional oil supplement and pilot pressurization functions, realization of accurate limit control of load pressure and guarantee of safe operation of a hydraulic system.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment.
Fig. 2 is an enlarged view of the pressure regulating valve sleeve of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the threaded plug-in type pilot boost two-stage relief valve in this embodiment includes a main valve sleeve 1, a main valve element 2, a pilot valve seat 5, a spool 3, a first spring 91, a second spring 92, a pilot valve element 4, a pressure regulating valve sleeve 7, a piston 6, a connecting sleeve 8, a push rod 62, and a third spring 93.
The main valve sleeve 1 is axially hollow, a first oil port 1a is formed at the front end, and a second oil port 1b is formed on the side wall; the main valve core 2 is movably disposed in the main valve housing 1, and is used for controlling the on/off of the first oil port 1a and the second oil port 1 b.
The front end of the pilot valve seat 5 is hermetically arranged at the rear end of the main valve core 2, a first oil cavity 1e is formed between the pilot valve seat 5 and the main valve core 2, and a pilot oil port 1c communicated with the second oil port 1b is formed in the lateral direction of the pilot valve seat 5; the spool 3 is provided on the main spool 2 and has a first oil passage in the middle connecting the first oil chamber 1e and the first oil port 1 a.
The first spring 91 is arranged in the first oil cavity 1e, and two ends of the first spring respectively abut against the main valve element 2 and the pilot valve seat 5; the second spring 92 is disposed in the first oil chamber 1e, and two ends of the second spring respectively abut against the spool 3 and the pilot valve seat 5.
The pilot valve core 4 is arranged on the pilot valve seat 5, the front end of the pilot valve core extends into the first oil cavity 1e, and the pilot oil port 1c is communicated with the first oil cavity 1e under the state that the pilot valve core 4 is separated from the pilot valve seat 5; the pressure regulating valve sleeve 7 is axially hollow, the front end of the pressure regulating valve sleeve is hermetically arranged at the rear end of the pilot valve seat 5, and the outer wall of the pressure regulating valve sleeve 7 is provided with a split cap 51 for limiting the pilot valve seat 5. As shown in fig. 2, the pressure regulating valve sleeve 7 includes a wide flared portion 73 and an extension portion 72 extending forward from the flared portion 73, the flared portion 73 and the front end of the connection sleeve 8 form a movable chamber 1f, and the extension portion 72 is connected to and assembled with the pilot valve core 5.
The push rod 62 is axially movably arranged in the pressure regulating valve sleeve 7, an annular groove 621 is formed in the push rod 62, an air flow channel 74 communicated with the atmosphere is formed in the pressure regulating valve sleeve 7, a splicing cap 51 is arranged on an outer wall port of the pressure regulating valve sleeve 7 of the air flow channel 74, and the air flow channel 74 is communicated with the annular groove 621 on an inner wall port of the pressure regulating valve sleeve 7. Although the split cap 51 covers the port, a gap is formed between the split cap 51 and the air flow channel 74, the split cap is not completely sealed, the air flow channel 74 is communicated with the atmosphere, the air in the annular groove 621 is ensured to keep consistent temperature with the atmosphere in the operation process, so that the operation is prevented from being interfered, the precision is reduced, meanwhile, the annular groove 621 can also reduce the friction force between the push rod 62 and the inner wall of the pressure regulating valve sleeve 7, and certain air damping can be formed due to the existence of the air in the annular groove 621, so that the stability and the sensitivity of a product are improved.
The connecting sleeve 8 is arranged at the rear end of the pressure regulating valve sleeve 7 and axially forms a third oil port 1d, and a movable cavity 1f is formed between the front end of the connecting sleeve 8 and the pressure regulating valve sleeve; the outer wall of the connecting sleeve 8 is provided with a limiting nut 71 for limiting the pressure regulating valve sleeve 7. The piston 6 is arranged in the movable cavity 1f in an axially movable manner, and the front end surface can drive the push rod to move forwards; the nut 71 and the split cap 51 are locked after pressure setting, and pressure drift caused by loosening of threads is prevented.
The third spring 93 is arranged in the pressure regulating valve sleeve 7 and always forces the push rod 62 to keep away from the pilot valve core 4.
Principle of operation
1.1 overflow valve principle: the main valve core 2 is pressed by a first spring 91 and a second spring 92 in advance, and the hydraulic pressure generated by the difference of two end areas under the action of high pressure tightly presses the main valve sleeve 1, the oil in the first oil port 1a is blocked from flowing to the second oil port 1b, the pressure of the first oil port 1a is maintained, the pressure of the first oil port 1a is continuously increased along with the increase of load, when the pressure of the first oil port 1a is increased to the hydraulic pressure generated by the product of the sealing area of the pilot valve core 4 and the pilot valve seat 5, which is larger than the pre-pressing force of a third spring 93, and the sum of the hydraulic pressure generated by the product of the pressure of the pilot valve core 4 and the pilot valve seat 5 and the pressure of the second oil port 1b, at the moment, the pilot valve core 4 and the pilot valve seat 5 start to separate, along with the increase of separation distance, the oil flows from the first oil chamber 1e to the second oil port, because the pressure gradient is formed by the flowing of the oil, the pressure of the first oil port 1a is greater than the pressure of the first oil chamber 1e, the pressure of the cavity of the first oil chamber 1e is greater than the pressure of the second oil port 1b, the hydraulic pressure acting on the main valve core 2 along with the increase of the pressure gradient is continuously reduced, so that the acting force is opposite in direction, the pre-pressing force of the first spring 91 and the second spring 92 is overcome, the main valve core 2 is separated from the valve sleeve 1, the oil directly flows to the second oil port 1b from the first oil port 1a, the pressure is kept stable and stable through dynamic convergence, and the valve plays a role in overflowing and pressure stabilizing in.
1.2 pilot supercharging principle: the pre-pressing force of the third spring 93 is a key element for setting the pressure of the first oil port 1a, the set pressure of the overflow valve is an important technical parameter of equipment, the safety of the equipment is directly determined, and once the set pressure needs to be regulated by a professional, the second-level pressure setting is needed correspondingly at least because the loads of the operation working conditions are different and have light loads, standard loads and heavy loads. When the third oil port 1d is connected to the oil tank and no pressure acts on the piston 6, the pressure of the first oil port 1a is set by the primary pre-compression force of the third spring 93; when the third oil port 1d is connected with pilot control oil, the pilot oil acts on the piston 6 to push the piston 6 until the pressure regulating connecting sleeve 13 is pressed, meanwhile, the push rod 15 pushes and presses the third spring 93, so that the height of the third spring 93 is shortened, the pre-compression force is increased and is a secondary pre-compression force, and the overflow pressure of the first oil port 1a rises at the moment corresponding to the secondary pre-compression force to meet the operation requirement of a heavy load working condition. When the oil returns, the third oil port 1d is connected with the oil tank to release pressure, and the overflow pressure of the first oil port 1a returns to the first-level standard setting.
1.3 one-way oil supplement principle: under the working condition of load such as weight descending, the pressure of the second oil port 1b is sometimes greater than that of the first oil port 1a, even the pressure of the first oil port 1a is lower than 1 atmospheric pressure, so that oil is sucked, cavitation erosion and other damages are caused, in order to prevent the extremely severe working condition, the second oil port 1b has certain oil return back pressure, at the moment, the hydraulic pressure generated by the difference of the areas of the two ends of the main valve core 2 under the pressure action of the second oil port 1b overcomes the pre-pressing force of the first spring 91 and the second spring 92, so that the main valve core 2 is separated from the valve sleeve 1, and the oil directly flows to the first oil port 1a from the second oil port 1b, so that the oil supplementing effect is achieved. As the pressure of the first port 1a rises, the main valve element 2 is pressed against the valve housing 1 by the pre-compression force of the first spring 91 and the second spring 92, and the valve port is closed.
This embodiment adopts to link to each other push rod and piston, combines to remove hydraulic pressure from taking the pilot control characteristics, realizes the pressure boost function, and overall layout is novel, and is reasonable, compact structure, and part is small in quantity, and is multiple functional. The method mainly provides a simple and easy implementation scheme for equipment power global optimization, efficiency improvement and emission reduction.
The oil-supplementing overflow valve is formed by parallelly connecting a check valve and an overflow valve. This embodiment has carried out integration organic whole with two kinds of advantages, adopts main valve element 2, and the integrated design of valve barrel 1 and pilot valve seat 5 has possessed overflow valve function and one-way oil supplementing function simultaneously, has reduced part quantity, improves the product reliability, and more mainly the integrated back space greatly reduces, adopts the screw thread cartridge form can be conveniently installed in the hydraulic pump export, and the import of main control valve very easily realizes system's overflow and one-way oil supplementing, greatly widens the application.
Generally, a main overflow valve controls a first oil cavity to be connected with a first oil port through a fixed small hole, namely fixed damping is formed, and variable damping formed by the size of the pilot valve core and the pilot valve seat is formed to form a hydraulic bridge circuit, so that the opening and closing of the main valve core are controlled by variable pressure gradient, and the overflow function is completed. The design adopts a slide valve structure to replace a fixed small hole to form variable damping, forms a double variable damping hydraulic bridge circuit, obtains a rapid convergence pressure gradient, achieves the purposes of rapid dynamic response, high control precision and good steady-state characteristic, blocks the peak value of load pressure from being transmitted to an engine, improves the performance of a hydraulic system and prolongs the service life of equipment.
Claims (5)
1. A thread plug-in type pilot supercharging two-stage overflow valve is characterized by comprising
The main valve sleeve (1) is hollow in the axial direction, a first oil port (1a) is formed at the front end of the main valve sleeve, and a second oil port (1b) is formed on the side wall of the main valve sleeve;
the main valve core (2) is movably arranged in the main valve sleeve (1) and is used for controlling the on-off of the first oil port (1a) and the second oil port (1 b);
the front end of the pilot valve seat (5) is hermetically arranged at the rear end of the main valve core (2), a first oil cavity (1e) is formed between the pilot valve seat and the main valve core (2), and a pilot oil port (1c) communicated with the second oil port (1b) is formed in the lateral direction of the pilot valve seat (5);
the sliding valve core (3) is arranged on the main valve core (2) and is provided with a first oil channel connected with a first oil cavity (1e) and a first oil port (1a) in the middle;
the first spring (91) is arranged at two ends in the first oil cavity (1e) and respectively props against the main valve core (2) and the pilot valve seat (5);
the second spring (92) is arranged at two ends in the first oil cavity (1e) and respectively pushes against the sliding valve core (3) and the pilot valve seat (5);
the pilot valve core (4) is arranged on the pilot valve seat (5), the front end of the pilot valve core extends into the first oil cavity (1e), and the pilot oil port (1c) is communicated with the first oil cavity (1e) when the pilot valve core (4) is separated from the pilot valve seat (5);
the pressure regulating valve sleeve (7) is hollow in the axial direction, and the front end of the pressure regulating valve sleeve is hermetically arranged at the rear end of the pilot valve seat (5);
a push rod (62) axially movably arranged in the pressure regulating valve sleeve (7);
the connecting sleeve (8) is arranged at the rear end of the pressure regulating valve sleeve (7) and axially forms a third oil port (1d), and a movable cavity (1f) is formed between the front end of the connecting sleeve (8) and the pressure regulating valve sleeve;
the piston (6) is axially movably arranged in the movable cavity (1f) and the front end surface of the piston can drive the push rod to move forwards; and
and the third spring (93) is arranged in the pressure regulating valve sleeve (7) and always forces the push rod (62) to keep away from the pilot valve core (4).
2. The threaded cartridge type pilot booster secondary overflow valve according to claim 1, characterized in that the outer wall of the connecting sleeve (8) is provided with a limit nut (71) for limiting the pressure regulating valve sleeve (7).
3. The threaded cartridge type pilot pressurizing secondary overflow valve according to claim 1, characterized in that the outer wall of the pressure regulating valve sleeve (7) is provided with a split cap (51) for limiting the pilot valve seat (5).
4. The threaded cartridge type pilot pressurizing two-stage overflow valve according to claim 3, wherein the push rod (62) is provided with an annular groove (621), the pressure regulating valve sleeve (7) is provided with an air flow channel (74) communicated with the atmosphere, the air flow channel (74) is provided with the split cap (51) at an outer wall port of the pressure regulating valve sleeve (7), and the air flow channel (74) is communicated with the annular groove (621) at an inner wall port of the pressure regulating valve sleeve (7).
5. The threaded cartridge type pilot pressurizing secondary relief valve according to claim 1, characterized in that the pressure regulating valve sleeve (7) comprises a wide flared part (73) and an extension part (72) extending forwards from the flared part (73), the flared part (73) and the front end of the connecting sleeve form a movable cavity, and the extension part (72) is connected and assembled with the pilot valve core (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921105613.6U CN210240160U (en) | 2019-07-15 | 2019-07-15 | Threaded plug-in type pilot supercharging two-stage overflow valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921105613.6U CN210240160U (en) | 2019-07-15 | 2019-07-15 | Threaded plug-in type pilot supercharging two-stage overflow valve |
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| Publication Number | Publication Date |
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| CN210240160U true CN210240160U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921105613.6U Active CN210240160U (en) | 2019-07-15 | 2019-07-15 | Threaded plug-in type pilot supercharging two-stage overflow valve |
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| CN (1) | CN210240160U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110259751A (en) * | 2019-07-15 | 2019-09-20 | 宁波克泰液压有限公司 | Threaded insertion pilot is pressurized second level overflow valve |
-
2019
- 2019-07-15 CN CN201921105613.6U patent/CN210240160U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110259751A (en) * | 2019-07-15 | 2019-09-20 | 宁波克泰液压有限公司 | Threaded insertion pilot is pressurized second level overflow valve |
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