CN114321054A - Two-dimensional proportional electrohydraulic piston - Google Patents
Two-dimensional proportional electrohydraulic piston Download PDFInfo
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- CN114321054A CN114321054A CN202111653336.4A CN202111653336A CN114321054A CN 114321054 A CN114321054 A CN 114321054A CN 202111653336 A CN202111653336 A CN 202111653336A CN 114321054 A CN114321054 A CN 114321054A
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- 238000007789 sealing Methods 0.000 claims description 43
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 239000003921 oil Substances 0.000 description 79
- 238000010586 diagram Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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Abstract
A two-dimensional proportional electro-hydraulic piston comprises a main valve and a pilot valve which are coaxially connected, wherein the main valve comprises a main valve sleeve and a main valve core, and a first high-pressure cavity, a first low-pressure cavity, a second high-pressure cavity and a second left low-pressure cavity are enclosed by the main valve sleeve, the main valve core and the pilot valve; the pilot valve comprises a pilot valve sleeve, a pilot valve core and an electro-mechanical converter, the pilot valve core, the pilot valve sleeve and the main valve are enclosed to form a second right low-pressure cavity, a working oil cavity and a sensitive cavity, and the second left low-pressure cavity is communicated with the second right low-pressure cavity and combined to form a second low-pressure cavity; the pilot valve spool is provided with a pair of low-pressure grooves and a pair of high-pressure grooves which are alternately arranged along the circumferential direction, and the low-pressure grooves and the high-pressure grooves are respectively intersected with the working oil cavity along with the rotation of the pilot valve spool; the low-pressure groove is directly communicated with the second low-pressure cavity, and the high-pressure groove is communicated with the oil inlet P through a second high-pressure flow passage arranged in the pilot valve sleeve and a first high-pressure flow passage arranged in the main valve sleeve. The invention has small volume, light weight and large driving force applied to the valve core.
Description
Technical Field
The invention relates to the field of hydraulic control, in particular to a two-dimensional proportional electrohydraulic piston.
Background
In recent years, as demands for a power-to-weight ratio of hydraulic elements have been increased, hydraulic elements have been developed in a direction of high pressure and high flow rate. In order to overcome the problem of high pressure and high flow rate, the hydraulic power is increased, and the main valve core needs to be driven by hydraulic pressure, namely, the electro-hydraulic control element needs to be designed into a pilot control structure. The two-dimensional valve based on the two-degree-of-freedom theory of the valve core is provided in the Raney construction of Zhejiang industrial university, the guide control level and the power level are combined into one and integrated on a single valve core, the size of the valve is reduced, the structure is more compact, the pollution resistance is further improved, and the two-dimensional valve is specifically applied to the occasions such as military industry, aerospace and the like.
In addition, in order to meet the requirements of the onboard equipment for light weight and small volume of the hydraulic components, miniaturization thereof is also necessary. The two-dimensional hydraulic valve adopts the electro-mechanical converter to increase the force or the moment, the electro-mechanical converter is inevitably reduced in the miniaturization process, the driving force or the moment is insufficient, and meanwhile, the problems that the internal space is small, the spring is reduced, the restoring force is insufficient and the like are caused.
Disclosure of Invention
In order to overcome the problems, the invention provides a two-dimensional proportional electrohydraulic piston.
The technical scheme adopted by the invention is as follows: a two-dimensional proportional electro-hydraulic piston comprises a main valve and a pilot valve which are coaxially connected, wherein the main valve comprises a main valve sleeve and a main valve core, and a first oil return port, a first working oil port, an oil inlet, a second working oil port and a second oil return port are arranged on the main valve sleeve; the main valve core is arranged in an inner hole of a main valve sleeve in an axially sliding manner, and a retaining spring is arranged in the main valve sleeve and positioned at the left end of the main valve core; the valve core of the main valve is sequentially provided with a first shoulder, a second shoulder and a third shoulder, and a first high-pressure cavity, a first low-pressure cavity, a second high-pressure cavity and a second left low-pressure cavity are sequentially formed by adjacent gaps between the left end of the valve sleeve of the main valve, the first shoulder, the second shoulder and the third shoulder and the right end of the valve sleeve of the main valve; the first oil return port is communicated with the first low-pressure cavity, the second shoulder is positioned at the first working oil port, and the third shoulder is positioned at the second working oil port;
the valve sleeve of the main valve is internally provided with a low-pressure flow passage and a high-pressure flow passage which extend axially, the left end of the low-pressure flow passage is communicated with the first oil return port, the low-pressure flow passage is communicated with the first low-pressure cavity and the second low-pressure cavity, and the high-pressure flow passage is communicated with the first high-pressure cavity and the oil inlet so that the valve core of the main valve can be pressed rightwards when the electro-mechanical converter does not work;
the pilot valve comprises a pilot valve sleeve, a pilot valve spool and an electro-mechanical converter, wherein the pilot valve spool is rotatably and axially slidably arranged in the pilot valve sleeve, the pilot valve spool is in a step shaft shape, and the diameter of the left section of the pilot valve spool is smaller than that of the right section of the pilot valve spool; the left end of the pilot valve core is spherical and is abutted against the right end of the main valve core, and the right section of the pilot valve core is in slidable sealing fit with the inner hole of the pilot valve sleeve; the left end of the pilot valve sleeve extends into the right end of the main valve sleeve, three sealing spaces are defined by the pilot valve spool, the pilot valve sleeve and the main valve, a second right low-pressure cavity, a working oil cavity and a sensitive cavity are sequentially arranged from left to right, and the second left low-pressure cavity is communicated with the second right low-pressure cavity and combined to form a second low-pressure cavity;
the right section of the valve core of the pilot valve and the position of the working oil cavity are provided with inclined slotted holes which are communicated in the radial direction, a central channel communicated with the inclined slotted holes is arranged in the valve core of the pilot valve, and the central channel extends rightwards along the axial direction and is communicated with the sensitive cavity; the pilot valve spool is also provided with a pair of low-pressure grooves and a pair of high-pressure grooves which are alternately arranged along the circumferential direction, and the low-pressure grooves and the high-pressure grooves are respectively intersected with the working oil cavity along with the rotation of the pilot valve spool; the low-pressure groove is directly communicated with the second low-pressure cavity, and the high-pressure groove is communicated with the oil inlet through a second high-pressure flow passage arranged in the pilot valve sleeve and a first high-pressure flow passage arranged in the main valve sleeve; the right part of the valve core of the pilot valve is also provided with a pair of tapered holes for connecting with the valve core plate;
a valve sleeve sealing piston is arranged between the connecting block and a working oil cavity of the pilot valve sleeve; the right end of the connecting block is connected with a shell, a third low-pressure cavity is enclosed by the pilot valve sleeve, the connecting block and the shell, and the third low-pressure cavity is communicated with the second low-pressure cavity through a low-pressure groove of the pilot valve spool;
an electro-mechanical converter is arranged in the third low-pressure cavity and comprises a sealing ring, magnetic steel, a coil rack, a coil, an armature, a magnetizer and a magnetic circuit adjusting block; the sealing ring is divided into a left part and a right part, the left part of the sealing ring consists of two symmetrical semicircular arcs, and a gap between the two semicircular arcs is arranged up and down; the right part of the sealing ring is of a horizontally arranged circular ring structure, and an axial mounting hole is formed between the left part and the right part of the sealing ring; the left part of the sealing ring is nested with the right end of the pilot valve sleeve, and the right end of the pilot valve sleeve is arranged in the mounting hole and is fixedly connected with the mounting hole through a flat-end screw;
coil frames are symmetrically arranged in the circular ring structure at the right part of the sealing ring, and coils are wound on the coil frames; the armature is placed in the center of the coil frame, magnetizers are arranged on the upper side and the lower side of the armature, and the magnetic steel is installed on the magnetizers; the magnetic circuit adjusting blocks are vertically and symmetrically arranged on the shell, and air gaps are formed among the magnetic circuit adjusting blocks, the magnetic steel and the magnetizer;
the armature is connected with the valve core plate, the valve core plate is in a U shape, and two ends of the valve core plate are respectively connected with the armature through cylindrical pins; the valve core plate is arranged in the gap at the left part of the sealing ring, the middle part of the valve core plate is provided with a through hole for the valve core of the pilot valve to pass through, and the valve core plate is connected with the valve core of the pilot valve through a conical head screw; a spring seat is arranged at the position of the upper notch and the lower notch of the left part of the sealing ring of the valve core plate, and a spring is arranged in the spring seat; the two ends of the spring are respectively connected with a steel ball which is tightly propped against the two semicircular arcs at the left part of the sealing ring. Furthermore, a sealing ring is arranged between the pilot valve sleeve and the main valve sleeve.
The working principle of the invention is as follows:
when the electric signal is not input, the coil is not electrified, and the position of each mechanism at the moment is set as an initial position. The working oil cavity and the sensitive cavity are in a sealed state, the forces applied to the two ends of the valve core are balanced, and the valve core does not move, so that the oil inlet P cannot be communicated with any working oil port.
When an electric signal is input, the coil is electrified, and the two-dimensional proportional electro-hydraulic piston works. As shown in fig. 8, the armature is subject to the magnetic force of the magnetizer, and rotates a certain angle to drive the valve core to rotate. When the valve core rotates clockwise, the high-pressure groove is communicated with the working oil cavity, high-pressure oil flows into the sensitive cavity from the oil inlet P through the first high-pressure flow passage, the second high-pressure flow passage, the working oil cavity and the central passage, the pressure of the sensitive cavity is increased, and the pressure of the sensitive cavity is related to the intersection area of the high-pressure groove and the working oil cavity, namely the rotation angle of the armature. When high-pressure oil flows into the sensitive cavity, the force pushing the right end face of the valve core to the left is larger than the force pushing the left end face of the valve core positioned in the first high-pressure cavity to the right, the valve core moves to the left, the working oil port A is communicated with the oil inlet P, and the working oil port B is communicated with the second oil return port T2; when the valve core rotates anticlockwise, the low-pressure groove is communicated with the working oil cavity, the sensitive cavity is communicated with the second low-pressure cavity, the pressure of the sensitive cavity is reduced, and the pressure of the sensitive cavity is related to the intersection area of the low-pressure groove and the working oil cavity, namely the rotation angle of the armature. When the hydraulic oil in the sensitive cavity flows out through the second oil return port T2, the force pushing the right end face of the valve core to the left is smaller than the force pushing the left end face of the valve core positioned in the first high-pressure cavity to the right, the valve core moves to the right, the working oil port A is communicated with the first oil return port T1, and the working oil port B is communicated with the oil inlet P.
When the electric signal is cut off, the coil is cut off, the rebound mechanism arranged in the pilot valve plays a role of returning, and the valve core rotates to the initial position, namely the working oil cavity and the sensitive cavity return to the sealing state again. At the moment, the force of pushing the right end face of the valve core to the left is smaller than the force of pushing the left end face of the valve core positioned in the first high-pressure cavity to the right, the valve core moves to the right to an initial position, and the oil inlet P returns to a state of not communicating with any working oil port again.
The axial direction refers to the direction in which the central axis of the spool is located.
The invention has the beneficial effects that:
1 is small, light and the valve core receives a large driving force. Compared with a common proportional electromagnet, the torque motor is integrated with the pilot valve, the overall size of the valve is reduced, the overall mass of the valve is reduced, in addition, the hydraulic pressure is adopted to drive the valve core to slide, the driving force is increased, and the frequency response of the electro-hydraulic piston is improved.
2 the torque motor has large rotation angle. The armature is arranged at the position close to the outside between the two magnetizers, so that the rotatable range of the armature is greatly increased, and the resolution of the valve is improved.
3 the flow gain is adjustable. A magnetic circuit adjusting block is added between the two magnetizers to change magnetic flux, so that the flow gain of the valve is adjusted.
4, the anti-pollution capability is strong, and the requirement on the oil liquid filtering precision is low.
5, the valve cores are in point contact with each other between a spherical surface and a plane, so that the friction resistance moment when the valve cores rotate is greatly reduced, and the requirement on the driving moment of the electro-mechanical converter is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of a front view of the present invention.
Fig. 3a is a schematic structural view of a main valve sleeve-T1 port cross section.
Fig. 3b is a schematic structural view of a main valve sleeve-P port section.
FIG. 4 is a schematic diagram of the construction of the pilot valve spool.
Fig. 5 is a schematic structural view of the oil inlet P communicating with the high-pressure groove.
Fig. 6 is a schematic diagram of a pilot valve.
Fig. 7 is a schematic structural diagram of a valve sleeve of the pilot valve.
Fig. 8 is a schematic view of the structure of the seal ring. Fig. 9 is a schematic structural view of the rebound mechanism.
FIG. 10 is a schematic view of an initial position of the electro-mechanical converter.
Fig. 11a is a schematic structural diagram of a closed state of the sensitive cavity.
Fig. 11b is a schematic view of the sensing chamber through low pressure.
Fig. 11c is a schematic diagram of the sensing chamber being energized by high pressure.
Description of reference numerals: 1. a main valve; 2. a pilot valve; 3. a first high pressure chamber; 4. a catch spring; 5. a main valve housing; 6. a main valve spool; 7. a pilot valve housing; 8. a pilot valve spool; 9. connecting blocks; 10. a valve sleeve seals the piston; 11. a spring seat; 12. a conical head screw; 13. a flat-end screw; 14. a seal ring; 15. pulling the valve core; 16. a pin; 17. an armature; 18. a magnetic circuit adjusting block; 19. magnetic steel; 20. a coil; 21. a bobbin; 22. a housing; 23. a magnetizer; 24. a sensitive cavity; 25. a central channel; 26. a third low pressure chamber; 27. a working oil chamber; 28. a second low pressure chamber; 29. a second high pressure chamber; 30. a first low pressure chamber; 31. a low-pressure flow passage; 32. a high-pressure flow passage; 33. a low pressure tank; 34. an inclined slotted hole; 35. a tapered hole; 36. a high pressure tank; 37. a first high pressure flow path; 38. a second high pressure flow path; 39. a spring; 40. and (5) steel balls.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to the attached drawings, the two-dimensional proportional electro-hydraulic piston comprises a main valve 1 and a pilot valve 2 which are coaxially connected, wherein the main valve 1 comprises a main valve sleeve 5 and a main valve spool 6, and the main valve sleeve 5 is provided with a first oil return port T1, a first working oil port A, an oil inlet P, a second working oil port B and a second oil return port T2; the main valve spool 6 is axially slidably arranged in an inner hole of the main valve sleeve 5, and a stop spring 4 is arranged in the main valve sleeve 5 and positioned at the left end of the main valve spool 6; a first shoulder, a second shoulder and a third shoulder are sequentially arranged on the main valve core 6, and a first high-pressure cavity 3, a first low-pressure cavity 30, a second high-pressure cavity 29 and a second left low-pressure cavity are sequentially formed by the adjacent gaps of the left end, the first shoulder, the second shoulder and the third shoulder of the main valve sleeve 5 and the right end of the main valve sleeve 5; the first oil return port T1 is communicated with the first low-pressure cavity 30, the second shoulder is positioned at the first working oil port A, and the third shoulder is positioned at the second working oil port B;
a low-pressure flow passage 31 and a high-pressure flow passage 32 which axially extend are arranged in the main valve sleeve 5, the left end of the low-pressure flow passage 31 is communicated with a first oil return port T1, the low-pressure flow passage 31 is communicated with a first low-pressure cavity 30 and a second low-pressure cavity 28, and the high-pressure flow passage 32 is communicated with a first high-pressure cavity 3 and an oil inlet P, so that the main valve core 6 can be rightwards abutted when the electro-mechanical converter does not work;
the pilot valve 2 comprises a pilot valve sleeve 7, a pilot valve spool 8 and an electro-mechanical converter, the pilot valve spool 8 is rotatably and axially slidably arranged in the pilot valve sleeve 7, the pilot valve spool 8 is in a step shaft shape, and the diameter of the left section of the pilot valve spool 8 is smaller than that of the right section; the left end of the pilot valve core 8 is spherical and is abutted against the right end of the main valve core 6, and the right section of the pilot valve core 8 is in slidable sealing fit with the inner hole of the pilot valve sleeve 7; the left end of the pilot valve sleeve 7 extends into the right end of the main valve sleeve 5, three sealing spaces are enclosed by the pilot valve spool 8, the pilot valve sleeve 7 and the main valve 1, a second right low-pressure cavity, a working oil cavity 27 and a sensitive cavity 24 are sequentially arranged from left to right, and the second left low-pressure cavity is communicated with the second right low-pressure cavity and combined to form a second low-pressure cavity 28;
an inclined groove hole 34 which is radially communicated is formed in the right section of the pilot valve spool 8 and is positioned in the working oil cavity 27, a central channel 25 communicated with the inclined groove hole 34 is arranged in the pilot valve spool 8, and the central channel 25 extends rightwards along the axial direction and is communicated with the sensitive cavity 24; the pilot valve spool 8 is also provided with a pair of low pressure grooves 33 and a pair of high pressure grooves 36 which are alternately arranged along the circumferential direction, and the low pressure grooves 33 and the high pressure grooves 36 are respectively intersected with the working oil cavity 27 along with the rotation of the pilot valve spool 8; the low-pressure groove 30 is directly communicated with the second low-pressure cavity 28, and the high-pressure groove 36 is communicated with the oil inlet P through a second high-pressure flow passage 38 arranged in the pilot valve sleeve 7 and a first high-pressure flow passage 37 arranged in the main valve sleeve 5; the right part of the pilot valve core 8 is also provided with a pair of tapered holes 35 used for connecting with the valve core plate 15;
a connecting block 9 is sleeved at the right end of the pilot valve sleeve 7, and a valve sleeve sealing piston 10 is arranged between the connecting block 9 and a working oil cavity 26 of the pilot valve sleeve 7; the right end of the connecting block 9 is connected with a shell 22, a third low-pressure cavity 26 is enclosed by the pilot valve sleeve 7, the connecting block 9 and the shell 22, and the third low-pressure cavity 26 is communicated with a second low-pressure cavity 28 through a low-pressure groove 33 of the pilot valve spool 8;
an electro-mechanical converter is arranged in the third low-pressure cavity 26, and comprises a sealing ring 14, magnetic steel 19, a coil rack 21, a coil 20, an armature 17, a magnetizer 23 and a magnetic circuit adjusting block 18; the sealing ring 14 is divided into a left part and a right part, the left part of the sealing ring 14 consists of two symmetrical semicircular arcs, and a gap between the two semicircular arcs is arranged up and down; the right part of the sealing ring 14 is of a horizontally arranged circular ring structure, and an axial mounting hole is formed between the left part and the right part of the sealing ring 14; the left part of the sealing ring 14 is connected with the right end of the pilot valve sleeve 7 in a nested manner, and the right end of the pilot valve sleeve 7 is arranged in the mounting hole and is fixedly connected with the mounting hole through a flat-end screw 13;
a coil rack 21 is symmetrically arranged in the circular ring structure at the right part of the sealing ring 14, and a coil 20 is wound on the coil rack 21; the armature 17 is arranged in the center of the coil frame 21, magnetizers 40 are arranged on the upper side and the lower side of the armature 17, and the magnetic steel 19 is arranged on the magnetizer 23; the magnetic circuit adjusting blocks 18 are symmetrically arranged on the shell 22 from top to bottom, and air gaps are formed among the magnetic circuit adjusting blocks 18, the magnetic steel 19 and the magnetizer 23; in addition, the magnetic flux of the magnetic steel 19 can be changed by adjusting the position and size of the magnetic circuit adjusting block 18, so that the rotation angle of the armature after being electrified can be adjusted.
The armature 17 is connected with the valve core plate 15, the valve core plate 15 is U-shaped, and two ends of the valve core plate 15 are respectively connected with the armature 17 through pins 16; the valve core plate 15 is arranged in a gap at the left part of the sealing ring 14, a through hole for the pilot valve core 8 to pass through is arranged in the middle of the valve core plate 15, and the valve core plate 15 is connected with the pilot valve core 8 through a conical head screw 12; a spring seat 11 is arranged at the position of the upper notch and the lower notch of the left part of the sealing ring 14 of the valve core plate 15, and a spring 39 is arranged in the spring seat 11; the two ends of the spring 39 are respectively connected with a steel ball 40, and the steel ball 40 is tightly pressed against the two semicircular arcs at the left part of the sealing ring 14. The pilot valve core can return to the initial position after the electric signal is disconnected.
The specific working process is as follows:
when the electric signal is not input, the coil 20 is not energized, and the position where each mechanism is located at this time is set as the initial position, as shown in fig. 11 a. The working oil cavity 27 and the sensitive cavity 24 are in a sealed state, the forces applied to the two ends of the valve core are balanced, and the valve core does not move, so that the oil inlet P cannot be communicated with any working oil port.
When an electric signal is input, the coil 20 is electrified, and the two-dimensional proportional electro-hydraulic piston works. As shown in fig. 8, the armature 17 is subject to the magnetic force of the magnetizer 40, and rotates a certain angle to rotate the valve element 8. When the valve core 8 rotates clockwise as shown in fig. 11b, the high pressure groove 36 communicates with the working oil chamber 27, the high pressure oil flows from the oil inlet P into the sensing chamber 24 through the first high pressure flow passage 37, the second high pressure flow passage 38, the working oil chamber 27 and the central passage 25, the pressure in the sensing chamber 24 increases, and the pressure of the sensing chamber 24 is related to the intersection area of the high pressure groove 36 and the working oil chamber 27, i.e., the rotation angle of the armature 17. When high-pressure oil flows into the sensitive cavity 24, the force pushing the right end face of the valve core 8 to the left is larger than the force pushing the left end face of the main valve core 6 in the first high-pressure cavity 3 to the right, the main valve core moves to the left, the working oil port A is communicated with the oil inlet P, and the working oil port B is communicated with the second oil return port T2; when the pilot valve spool 8 is rotated counterclockwise as shown in fig. 11c, the low pressure groove 33 communicates with the working-oil chamber 27, the sensing chamber 24 communicates with the second low pressure chamber 28, and the sensing chamber 24 is reduced in pressure, the magnitude of which is related to the intersection area of the low pressure groove 33 and the working-oil chamber 27, i.e., the rotational angle of the armature 17. When the hydraulic oil in the sensitive cavity 24 flows out through the second oil return port T2, the force pushing the right end face of the valve core 8 to the left is smaller than the force pushing the left end face of the main valve core 6 located in the first high-pressure cavity to the right, the main valve core moves to the right, the working oil port a is communicated with the first oil return port T1, and the working oil port B is communicated with the oil inlet P.
When the electric signal is cut off, the coil 20 is cut off, the rebound mechanism arranged in the pilot valve plays a role of returning, as shown in fig. 11a, the pilot valve spool 8 is turned back to the initial position, namely the working oil chamber 27 and the sensitive chamber 24 return to the sealing state again. At this time, the force pushing the right end face of the pilot valve spool 8 to the left is smaller than the force pushing the left end face of the main valve spool 6 to the right in the first high-pressure cavity, the main valve spool 6 moves to the right to the initial position, and the oil inlet P returns to the state of not communicating with any working oil port.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (2)
1. The two-dimensional proportional electrohydraulic piston is characterized in that: the hydraulic control valve comprises a main valve (1) and a pilot valve (2) which are coaxially connected, wherein the main valve (1) comprises a main valve sleeve (5) and a main valve spool (6), and a first oil return port (T1), a first working oil port (A), an oil inlet (P), a second working oil port (B) and a second oil return port (T2) are arranged on the main valve sleeve (5); the main valve spool (6) is axially slidably arranged in an inner hole of the main valve sleeve (5), and a retaining spring (4) is arranged in the main valve sleeve (5) and positioned at the left end of the main valve spool (6); a first shoulder, a second shoulder and a third shoulder are sequentially arranged on the main valve core (6), and a first high-pressure cavity (3), a first low-pressure cavity (30), a second high-pressure cavity (29) and a second left low-pressure cavity are sequentially formed by adjacent gaps between the left end of the main valve sleeve (5), the first shoulder, the second shoulder and the third shoulder and the right end of the main valve sleeve (5); the first oil return port (T1) is communicated with the first low-pressure cavity (30), the second shoulder is positioned at the first working oil port (A), and the third shoulder is positioned at the second working oil port (B);
a low-pressure flow passage (31) and a high-pressure flow passage (32) which axially extend are arranged in a main valve sleeve (5), the left end of the low-pressure flow passage (31) is communicated with a first oil return port (T1), the low-pressure flow passage (31) is communicated with a first low-pressure cavity (30) and a second low-pressure cavity (28), and the high-pressure flow passage (32) is communicated with a first high-pressure cavity (3) and an oil inlet (P) to enable a main valve spool (6) to be pressed rightwards when the electro-mechanical converter does not work;
the pilot valve (2) comprises a pilot valve sleeve (7), a pilot valve spool (8) and an electro-mechanical converter, the pilot valve spool (8) is rotatably and axially slidably arranged in the pilot valve sleeve (7), the pilot valve spool (8) is in a step shaft shape, and the diameter of the left section of the pilot valve spool (8) is smaller than that of the right section; the left end of the pilot valve spool (8) is spherical and is abutted against the right end of the main valve spool (6), and the right section of the pilot valve spool (8) is in slidable sealing fit with the inner hole of the pilot valve sleeve (7); the left end of the pilot valve sleeve (7) extends into the right end of the main valve sleeve (5), three sealing spaces are defined by the pilot valve spool (8), the pilot valve sleeve (7) and the main valve (1), a second right low-pressure cavity, a working oil cavity (27) and a sensitive cavity (24) are sequentially arranged from left to right, and the second left low-pressure cavity is communicated with the second right low-pressure cavity and combined to form a second low-pressure cavity (28);
a radial through inclined groove hole (34) is formed in the right section of the pilot valve spool (8) and located in the working oil cavity (27), a central channel (25) communicated with the inclined groove hole (34) is arranged in the pilot valve spool (8), and the central channel (25) extends rightwards along the axial direction and is communicated with the sensitive cavity (24); the pilot valve spool (8) is also provided with a pair of low-pressure grooves (33) and a pair of high-pressure grooves (36) which are alternately arranged along the circumferential direction, and the low-pressure grooves (33) and the high-pressure grooves (36) are respectively intersected with the working oil cavity (27) along with the rotation of the pilot valve spool (8); the low-pressure groove (30) is directly communicated with the second low-pressure cavity (28), and the high-pressure groove (36) is communicated with the oil inlet (P) through a second high-pressure flow passage (38) arranged in the pilot valve sleeve (7) and a first high-pressure flow passage (37) arranged in the main valve sleeve (5); the right part of the pilot valve core (8) is also provided with a pair of tapered holes (35) used for being connected with the valve core plate (15);
a connecting block (9) is sleeved at the right end of the pilot valve sleeve (7), and a valve sleeve sealing piston (10) is arranged between the connecting block (9) and a working oil cavity (26) of the pilot valve sleeve (7); the right end of the connecting block (9) is connected with a shell (22), a pilot valve sleeve (7), the connecting block (9) and the shell (22) jointly enclose a third low-pressure cavity (26), and the third low-pressure cavity (26) is communicated with a second low-pressure cavity (28) through a low-pressure groove (33) of a pilot valve spool (8);
an electro-mechanical converter is arranged in the third low-pressure cavity (26), and the electro-mechanical converter comprises a sealing ring (14), magnetic steel (19), a coil rack (21), a coil (20), an armature (17), a magnetizer (23) and a magnetic circuit adjusting block (18); the sealing ring (14) is divided into a left part and a right part, the left part of the sealing ring (14) consists of two symmetrical semicircular arcs, and a gap between the two semicircular arcs is arranged up and down; the right part of the sealing ring (14) is of a horizontally arranged circular ring structure, and an axial mounting hole is formed between the left part and the right part of the sealing ring (14); the left part of the sealing ring (14) is connected with the right end of the pilot valve sleeve (7) in a nested manner, and the right end of the pilot valve sleeve (7) is arranged in the mounting hole and is fixedly connected with the mounting hole through a flat-end screw (13);
a coil rack (21) is symmetrically arranged in the circular ring structure at the right part of the sealing ring (14), and a coil (20) is wound on the coil rack (21); the armature (17) is placed in the center of the coil frame (21), magnetizers (23) are arranged on the upper side and the lower side of the armature (17), and the magnetic steel (19) is installed on the magnetizers (23); the magnetic circuit adjusting blocks (18) are vertically and symmetrically arranged on the shell (22), and air gaps are formed among the magnetic circuit adjusting blocks (18), the magnetic steel (19) and the magnetizer (23);
the armature (17) is connected with the valve core plate (15), the valve core plate (15) is U-shaped, and two ends of the valve core plate (15) are respectively connected with the armature (17) through cylindrical pins; the valve core plate (15) is arranged in a notch at the left part of the sealing ring (14), a through hole for the pilot valve core (8) to pass through is formed in the middle of the valve core plate (15), and the valve core plate (15) is connected with the pilot valve core (8) through a conical head screw (12); a spring seat (11) is arranged at the position of the valve core plate (15) at the upper and lower notches at the left part of the sealing ring (14), and a spring (39) is arranged in the spring seat (11); two ends of the spring (39) are respectively connected with a steel ball (40), and the steel ball (40) is tightly propped against the two semicircular arcs at the left part of the sealing ring (14).
2. A two-dimensional proportional electrohydraulic piston of claim 1, wherein: and a sealing ring is arranged between the pilot valve sleeve (7) and the main valve sleeve (5).
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| CN202111653336.4A CN114321054B (en) | 2021-12-30 | 2021-12-30 | Two-dimensional proportional electrohydraulic piston |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114483686A (en) * | 2021-12-13 | 2022-05-13 | 浙江工业大学 | Two-dimensional switch electrohydraulic piston |
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| CN108506263A (en) * | 2018-05-22 | 2018-09-07 | 浙江工业大学 | Plug-in two dimension servo valve with temperature compensating type damping piston |
| CN111457130A (en) * | 2019-01-22 | 2020-07-28 | 浙江工业大学 | Miniature integrated two-dimensional electromagnetic switch valve |
| CN111749939A (en) * | 2019-03-26 | 2020-10-09 | 浙江工业大学 | Large-traffic two-dimensional piston flow servo valve |
| CN112983916A (en) * | 2021-03-19 | 2021-06-18 | 浙江工业大学 | Two-dimensional plug-in mounting type load sensitive valve |
| CN114483686A (en) * | 2021-12-13 | 2022-05-13 | 浙江工业大学 | Two-dimensional switch electrohydraulic piston |
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- 2021-12-30 CN CN202111653336.4A patent/CN114321054B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506263A (en) * | 2018-05-22 | 2018-09-07 | 浙江工业大学 | Plug-in two dimension servo valve with temperature compensating type damping piston |
| CN111457130A (en) * | 2019-01-22 | 2020-07-28 | 浙江工业大学 | Miniature integrated two-dimensional electromagnetic switch valve |
| CN111749939A (en) * | 2019-03-26 | 2020-10-09 | 浙江工业大学 | Large-traffic two-dimensional piston flow servo valve |
| CN112983916A (en) * | 2021-03-19 | 2021-06-18 | 浙江工业大学 | Two-dimensional plug-in mounting type load sensitive valve |
| CN114483686A (en) * | 2021-12-13 | 2022-05-13 | 浙江工业大学 | Two-dimensional switch electrohydraulic piston |
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| CN114483686A (en) * | 2021-12-13 | 2022-05-13 | 浙江工业大学 | Two-dimensional switch electrohydraulic piston |
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