CN214304602U - Novel rotatory electro-hydraulic servo valve that directly drives of screw thread cartridge formula - Google Patents

Abstract

The utility model provides a novel rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula, its machining process degree of difficulty, the reduce cost that effectively reduces motor and slide valve subassembly, and can effectively improve static performance, dynamic behavior and zero bit stability of this servo valve to can effectively increase of service life. The slide valve assembly comprises a quincunx valve core, a valve sleeve, an upper end cover and a lower end cover, wherein the central upward convex part of the quincunx valve core is protruded above the upper end cover, the central downward convex part of the quincunx valve core is inserted into a central positioning hole of the lower end cover, the upper end cover is covered on the upper end surface of the valve sleeve, the lower end cover is covered on the lower end surface of the valve sleeve, the quincunx valve core is inserted into an inner cavity of the valve sleeve, a shell of the ultrasonic motor is fixedly connected with the upper end cover through a connecting bolt, and a plurality of connecting holes are uniformly distributed on the outer annular surface of the upper end cover, which is opposite to the slide valve assembly.

Description

Novel rotatory electro-hydraulic servo valve that directly drives of screw thread cartridge formula

Technical Field

The utility model relates to a technical field of electro-hydraulic servo valve specifically is a novel rotatory electro-hydraulic servo valve that directly drives of screw thread cartridge formula.

Background

The electro-hydraulic servo valve is used as a key element of an electro-hydraulic servo control system, is an electro-hydraulic conversion element and a power amplification element, connects an electric part with a hydraulic part to realize the conversion and amplification of electro-hydraulic signals, and the performance of the electro-hydraulic servo valve determines the performance of the whole electro-hydraulic servo control system to a great extent.

At present, most of studied thread plug-in mounting type rotary direct-drive electro-hydraulic servo valves are driven by a servo motor, a stepping motor or a voice coil motor, and can be popularized due to zero stability. I specially add the harmonic speed reducer machine between servo motor and slide valve subassembly in order to solve zero stability, its static stability is improved to some extent, but its dynamic behavior is hindered so that the life-span of harmonic speed reducer machine sharply reduces. The servo motor, the stepping motor and the voice coil motor have relatively complex structures and higher technical barriers of harmonic speed reducers, so that the production cost is higher

Disclosure of Invention

To the above problem, the utility model provides a novel rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula, its machining process degree of difficulty, the reduce cost that effectively reduces motor and slide valve subassembly, and can effectively improve static performance, dynamic behavior and zero-bit stability of this servo valve to can effectively increase of service life.

The utility model provides a novel rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula which characterized in that: the slide valve assembly comprises an ultrasonic motor and a slide valve assembly, wherein the slide valve assembly comprises a quincunx valve core, a valve sleeve, an upper end cover and a lower end cover, the central upward convex part of the quincunx valve core is protruded above the upper end cover, the central downward convex part of the quincunx valve core is inserted into a central positioning hole of the lower end cover, the upper end cover is covered on the upper end surface of the valve sleeve, the lower end cover is covered on the lower end surface of the valve sleeve, the quincunx valve core is inserted into an inner cavity of the valve sleeve, a shell of the ultrasonic motor is fixedly connected with the upper end cover through a connecting bolt, a plurality of connecting holes are uniformly distributed on the outer ring surface of the upper end cover relative to the slide valve assembly, the connecting bolt penetrates through the connecting holes and then is fixedly connected with the corresponding position of the shell of the ultrasonic motor, the end surface of an output shaft of the ultrasonic motor, facing the central upward convex part, is fixedly connected with the corresponding position of the central upward convex part through a locking screw, the peripheral surface of the outer ring of the upper end cover is provided with external threads, and the external threads are used for being connected with an integrated valve block in an installing mode.

It is further characterized in that:

a high-precision encoder is arranged on the part, far away from the center and protruding upwards, of the output shaft of the ultrasonic motor, so that the precise control of the electro-hydraulic servo valve is ensured;

the valve sleeve is provided with a P port, a T port, an A port and a B port which are externally communicated to an inner cavity, the P port, the T port, the A port and the B port are respectively positioned on different height planes of the valve sleeve and are arranged, the same ports are positioned on the same height plane, four parting strips are annularly distributed on the outer ring of the quincunx valve core, each parting strip is arranged along the height direction of the quincunx valve core positioned in the inner cavity, and a circulation cavity is formed between the adjacent parting strips; when the electro-hydraulic servo valve is in a zero position, the port P, the port A, the port B and the port T are isolated from each other; when the valve core is in a working state, the port P is communicated with the port A or the port B through a circulation cavity of the valve core, the port T is communicated with the port B or the port A through the circulation cavity of the valve core, and the port P and the port T are not communicated with the port A or the port B at the same time;

the center of the end face, facing the central upper convex part, of the output shaft of the ultrasonic motor is recessed inwards to form a recessed positioning hole, the central upper convex part is inserted into the recessed positioning hole, the locking screw is specifically a hexagon socket head locking screw, and the locking screw penetrates through an outer ring positioning hole and is positioned and connected with the corresponding axial outer ring position of the central upper convex part;

the radian ranges of the four circulation cavities are the same, so that the whole structure is convenient to manufacture;

the radian range of the circulation cavity is larger than the interval radians of the port P and the port A and the port P and the port B, so that the circulation cavity can be communicated with an oil way;

the port A, the port P, the port B and the port T are arranged from top to bottom along the height direction of the valve sleeve, and the radians of adjacent projection positions of the port A, the port P, the port B and the port T in the projection state are arranged at intervals of 45 degrees;

an inner concave pressure groove is formed in the outer convex upper end surface of the upper end cover corresponding to the position of the central upper convex part, an upper pressure sheet of the upper end cover is arranged in the inner concave pressure groove, a sealing cavity is formed in the central position of the inner concave pressure groove facing the upper end cover, a sealing assembly is arranged in the sealing cavity and sleeved on the outer ring surface of the central upper convex part at the corresponding height, axial positioning holes are distributed on the outer ring of the upper pressure sheet of the upper end cover, and an upper fastening bolt penetrates through the axial positioning holes and then is fixedly connected with the upper pressure cover and the corresponding positioning holes of the valve sleeve respectively, so that the upper end cover, the quincunx valve core and the valve sleeve are stably, hermetically and quickly mounted;

the lower surface of the upper end cover is provided with an annular groove, the outer annular surface of the valve sleeve in the height direction is provided with a plurality of concave ring grooves, and the annular groove and the concave ring grooves are used for installing O-shaped rings so as to prevent oil leakage.

Adopt the utility model discloses a behind the structure, transform the structure of servo motor + harmonic speed reducer into ultrasonic motor, electrical apparatus conversion equipment adopts ultrasonic motor, inherit the rotatory advantage that directly drives the electro-hydraulic servo valve of screw-in cartridge formula that drives the plum blossom case by the harmonic speed reducer, and overcome and driven the rotatory processing technology degree of difficulty and the manufacturing cost that directly drives the electrical apparatus conversion equipment of electro-hydraulic servo valve of screw-in cartridge formula of plum blossom case by the harmonic speed reducer, and improved static behavior, dynamic behavior and zero bit stability, make it have better practicality and market prospect.

Drawings

Fig. 1 is a schematic view of the front view of the present invention in a partial sectional structure;

FIG. 2 is a front view cross-sectional structural schematic of the slide valve assembly of the present invention;

FIG. 3 is a schematic view of section A-A of FIG. 2;

FIG. 4 is a schematic view of section B-B of FIG. 2;

FIG. 5 is a schematic view of the cross-sectional view C-C of FIG. 2;

FIG. 6 is a schematic view of the cross-sectional view D-D of FIG. 2;

the names corresponding to the sequence numbers in the figure are as follows:

the ultrasonic motor 1, a shell 101, an output shaft 102, a slide valve assembly 2, a quincunx valve core 3, a central upper convex part 31, a central lower convex part 32, a parting bead 33, a valve sleeve 4, a P port 41, a T port 42, an A port 43, a B port 44, an upper end cover 5, a connecting hole 51, an external thread 52, a lower end cover 6, a central positioning hole 61, a connecting bolt 7, a locking screw 8, a high-precision encoder 9, a circulating cavity 10, a concave positioning hole 11, an outer ring positioning hole 12, a concave pressing groove 13, an upper end cover pressing sheet 14, a sealing cavity 15, a sealing assembly 16, an axial positioning hole 17, an upper fastening bolt 18, an annular groove 19 and a concave ring groove 20.

Detailed Description

A novel thread cartridge type rotary direct-drive electro-hydraulic servo valve is shown in figures 1-6: the slide valve assembly 2 comprises an ultrasonic motor 1 and a slide valve assembly 2, wherein the slide valve assembly 2 comprises a quincunx valve core 3, a valve sleeve 4, an upper end cover 5 and a lower end cover 6, a central upward convex part 31 of the quincunx valve core 3 protrudes above the upper end cover 5, a central downward convex part 32 of the quincunx valve core 3 is inserted in a central positioning hole 61 of the lower end cover 6, the upper end cover 5 is covered on the upper end surface of the valve sleeve 4, the lower end cover 6 is covered on the lower end surface of the valve sleeve 4, the quincunx valve core 3 is inserted in an inner cavity of the valve sleeve 4, a shell body 101 of the ultrasonic motor 1 is fixedly connected with the upper end cover 5 through a connecting bolt 7, a plurality of connecting holes 51 are uniformly distributed on the outer annular surface of the upper end cover 5 relative to the slide valve assembly 2, the connecting bolt 7 penetrates through the connecting holes 51 and is fixedly connected to the corresponding position of the shell body 101 of the ultrasonic motor 1, the end surface of an output shaft 102 of the ultrasonic motor 1 facing the central upward convex part 31 is fixedly connected with the corresponding position of the central upward convex part 31 through a locking bolt 8, the outer ring peripheral surface of the upper end cover 5 is provided with external threads 52, and the external threads 52 are used for mounting and connecting with the integrated valve block.

The output shaft 102 of the ultrasonic motor 1 is provided with a high-precision encoder 9 far away from the central convex part 31, so that the precise control of the electro-hydraulic servo valve is ensured;

the valve sleeve 4 is provided with a P port 41, a T port 42, an A port 43 and a B port 44 which are externally communicated to the inner cavity, the P port 41, the T port 42, the A port 43 and the B port 44 are respectively positioned on different height planes of the valve sleeve 4, the same ports are positioned on the same height plane, the outer ring of the quincunx valve core 3 is annularly provided with four partition bars 33, each partition bar 33 is arranged along the height direction of the quincunx valve core 3 positioned in the inner cavity, and a circulation cavity 10 is formed between the adjacent partition bars 33; when the electro-hydraulic servo valve is in a zero position, the P port 41, the A port 43, the B port 44 and the T port 42 are isolated from each other; in the working state, the P port 41 is communicated with the A port 43 or the B port 44 through the circulation cavity 10 of the valve core, the T port 42 is communicated with the B port 44 or the A port 43 through the circulation cavity 10 of the valve core, and the P port 41 and the T port 42 are not communicated with the A port 43 or the B port 44 simultaneously;

the center of the end face, facing the central upper convex part 31, of the output shaft 101 of the ultrasonic motor 1 is concave inwards to form a concave positioning hole 11, the central upper convex part 31 is inserted into the concave positioning hole 11, the locking screw 8 is specifically a hexagon socket locking screw, and the locking screw 8 penetrates through the outer ring positioning hole 12 and is then positioned and connected with the corresponding axial outer ring position of the central upper convex part 31;

the radian ranges of the four circulation cavities 10 are the same, so that the whole structure is convenient to manufacture;

the radian range of the circulation cavity 10 is larger than the interval radians of the port P41, the port A43 and the port P41 and the port B44, so that the circulation cavity can be communicated with an oil way;

the port a 43, the port P41, the port B44 and the port T42 are arranged from top to bottom along the height direction of the valve housing 4, and the radian intervals of adjacent projection positions of the port a 43, the port P41, the port B44 and the port T42 in the projection state are arranged at 45 degrees;

an inner concave pressure groove 13 is formed in the position, corresponding to the central upper convex part 31, of the upper end cover 5, an upper end cover pressing sheet 14 is arranged in the inner concave pressure groove 13, a sealing cavity 15 is formed in the position, facing the center of the upper end cover 5, of the inner concave pressure groove 13, a sealing assembly 16 is arranged in the sealing cavity 15, the sealing assembly 16 is sleeved on the outer ring surface of the central upper convex part 31 at the corresponding height, axial positioning holes 17 are formed in the outer ring of the upper end cover pressing sheet 14 in a surrounding mode, an upper fastening bolt 18 penetrates through the axial positioning holes 17 and then is fixedly connected with the upper pressing cover 5 and the corresponding positioning holes of the valve sleeve 4, and therefore the upper end cover 5, the quincunx valve core 3 and the valve sleeve 4 are stably, hermetically and quickly mounted;

the lower surface of the upper end cover 5 is provided with an annular groove 19, the outer annular surface of the valve sleeve 4 in the height direction is provided with a plurality of concave ring grooves 20, and the annular groove 19 and the concave ring grooves 20 are both used for installing O-shaped rings so as to prevent oil leakage.

The working principle is as follows: the structure of the servo motor and the harmonic reducer is converted into the ultrasonic motor, the electric appliance conversion device adopts the ultrasonic motor, the advantages of the threaded plug-in type rotary direct-drive electro-hydraulic servo valve with the quincunx valve core driven by the harmonic reducer are inherited, the processing process difficulty and the production cost of the electric appliance conversion device with the threaded plug-in type rotary direct-drive electro-hydraulic servo valve with the quincunx valve core driven by the harmonic reducer are overcome, the static performance, the dynamic performance and the zero position stability are improved, and the electric appliance conversion device has better practicability and market prospect.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. The utility model provides a novel rotatory electrohydraulic servo valve that directly drives of screw thread cartridge formula which characterized in that: the slide valve assembly comprises an ultrasonic motor and a slide valve assembly, wherein the slide valve assembly comprises a quincunx valve core, a valve sleeve, an upper end cover and a lower end cover, the central upward convex part of the quincunx valve core is protruded above the upper end cover, the central downward convex part of the quincunx valve core is inserted into a central positioning hole of the lower end cover, the upper end cover is covered on the upper end surface of the valve sleeve, the lower end cover is covered on the lower end surface of the valve sleeve, the quincunx valve core is inserted into an inner cavity of the valve sleeve, a shell of the ultrasonic motor is fixedly connected with the upper end cover through a connecting bolt, a plurality of connecting holes are uniformly distributed on the outer ring surface of the upper end cover relative to the slide valve assembly, the connecting bolt penetrates through the connecting holes and then is fixedly connected with the corresponding position of the shell of the ultrasonic motor, the end surface of an output shaft of the ultrasonic motor, facing the central upward convex part, is fixedly connected with the corresponding position of the central upward convex part through a locking screw, the peripheral surface of the outer ring of the upper end cover is provided with external threads, and the external threads are used for being connected with an integrated valve block in an installing mode.

2. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: and a high-precision encoder is arranged on the part, far away from the center, of the output shaft of the ultrasonic motor and protruding upwards.

3. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the valve sleeve is provided with a P port, a T port, an A port and a B port which are externally communicated to an inner cavity, the P port, the T port, the A port and the B port are respectively positioned on different height planes of the valve sleeve and are arranged, the same ports are positioned on the same height plane, four parting strips are annularly distributed on the outer ring of the quincunx valve core, each parting strip is arranged along the height direction of the quincunx valve core positioned in the inner cavity, and a circulation cavity is formed between the adjacent parting strips; when the electro-hydraulic servo valve is in a zero position, the port P, the port A, the port B and the port T are isolated from each other; when the valve core is in a working state, the port P is communicated with the port A or the port B through the circulation cavity of the valve core, the port T is communicated with the port B or the port A through the circulation cavity of the valve core, and the port P and the port T are not communicated with the port A or the port B at the same time.

4. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the center of the end face, facing the central upward-protruding part, of the output shaft of the ultrasonic motor is recessed inwards to form a recessed positioning hole, the central upward-protruding part is inserted into the recessed positioning hole, the locking screw is specifically a hexagon socket head cap locking screw, and the locking screw penetrates through the outer ring positioning hole and is then positioned and connected with the corresponding axial outer ring position of the central upward-protruding part.

5. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 3, wherein: the radian ranges of the four circulation cavities are the same.

6. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 3, wherein: the radian range of the circulating cavity is larger than the interval radians of the port P and the port A and the port P and the port B.

7. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 3, wherein: the port A, the port P, the port B and the port T are arranged from top to bottom along the height direction of the valve sleeve, and the radians of adjacent projection positions of the port A, the port P, the port B and the port T in the projection state are arranged at an interval of 45 degrees.

8. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the upper end cover is provided with an inner concave pressing groove corresponding to the outer convex upper end surface of the central upper convex part, an upper end cover pressing sheet is arranged in the inner concave pressing groove, a sealing cavity is arranged at the central position of the inner concave pressing groove facing the upper end cover, a sealing assembly is arranged in the sealing cavity, the sealing assembly is sleeved on the outer ring surface of the central upper convex part at the corresponding height, axial positioning holes are distributed on the outer ring of the upper end cover pressing sheet, and an upper fastening bolt penetrates through the axial positioning holes and then is fixedly connected with the corresponding positioning holes of the upper pressing cover and the valve sleeve.

9. The novel threaded cartridge type rotary direct-drive electro-hydraulic servo valve as claimed in claim 1, wherein: the lower surface of the upper end cover is provided with an annular groove, the outer annular surface of the valve sleeve in the height direction is provided with a plurality of concave annular grooves, and the annular groove and the concave annular grooves are used for installing O-shaped rings.

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