CN116293052A

CN116293052A - Four-redundancy two-stage servo valve taking direct-drive valve as pilot

Info

Publication number: CN116293052A
Application number: CN202211732925.6A
Authority: CN
Inventors: 江金林; 张鑫彬; 金理; 郭加利; 朱文杰
Original assignee: Shanghai Aerospace Control Technology Institute
Current assignee: Shanghai Aerospace Control Technology Institute
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-23

Abstract

The invention provides a four-redundancy two-stage servo valve taking a direct-drive valve as a guide, which comprises the following components: the device comprises a bidirectional proportional electromagnet, four redundant coils, a pilot spool, an LVDT body, four redundant LVDT demodulators and four redundant servo amplifiers, wherein the LVDT refers to an existing linear displacement sensor; the four redundant coils are arranged in the bidirectional proportional electromagnet and connected to the pilot slide valve to form the direct-drive valve, and the direct-drive valve is used as a pilot stage of a two-stage servo valve; the pilot spool is connected to a power stage spool, the LVDT body is mounted on the power stage spool, the four redundant LVDT demodulator is connected with the LVDT body and the four redundant servo amplifier, and the four redundant servo amplifier is connected with the bidirectional proportional electromagnet. The four-redundancy design is adopted for the three key parts of the electric part, the electric feedback part and the servo amplifier of the servo valve taking the direct-drive valve as the pilot, so that the reliability of the electrohydraulic servo valve is greatly improved.

Description

Four-redundancy two-stage servo valve taking direct-drive valve as pilot

Technical Field

The invention relates to the field of electrohydraulic servo control devices, in particular to a four-redundancy two-stage servo valve taking a direct-drive valve as a pilot.

Background

In order to meet the dynamic performance requirement of a high-flow electrohydraulic servo valve, a certain type of small-flow servo valve is generally used as a pilot stage to drive a slide valve of a power stage, and high-flow output is realized by closing a position loop of a power stage valve core. At present, a common high-flow electrohydraulic servo valve mainly takes a double-nozzle baffle plate and a jet pipe valve as pilot stages, and a direct-drive valve is also adopted as the pilot stage. The internal throttle aperture and the jet block clearance of the double-nozzle baffle and the jet pipe servo valve are very small, so that the double-nozzle baffle and the jet pipe servo valve are more sensitive to pollution of oil, and high cleanliness of the oil is required; the current large-flow servo valves with direct-drive valves as the leads do not adopt redundant designs for the key parts, and the critical parts fail to cause fatal faults of the system.

In certain aerospace fields, to ensure extremely low failure rate of electro-hydraulic servo systems, extremely high reliability requirements are imposed on high-flow electro-hydraulic servo valves as core control components.

The prior patent references are as follows:

patent document CN110260027a discloses a valve actuating mechanism based on electrohydraulic servo direct drive, which comprises an electrohydraulic servo system and an actuating mechanical system, wherein the electrohydraulic servo system comprises a servo motor, a hydraulic pump, a first hydraulic control one-way valve, a first pressure sensor, a first safety valve, a hydraulic motor, a second safety valve, a second pressure sensor and a second hydraulic control one-way valve; when the hydraulic pump rotates positively, high-pressure oil provided by the hydraulic pump enters the hydraulic motor through the first hydraulic control one-way valve, and the hydraulic motor drives the valve core of the valve to rotate so as to realize the opening of the valve; when the hydraulic pump rotates reversely, the supplied high-pressure oil enters the hydraulic motor through the second hydraulic control one-way valve, and the hydraulic motor drives the valve core of the valve to rotate, so that the valve is closed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a four-redundancy two-stage servo valve taking a direct-drive valve as a guide.

According to the invention, the four-redundancy two-stage servo valve taking the direct-drive valve as a guide comprises the following components: the device comprises a bidirectional proportional electromagnet, four redundant coils, a pilot spool, an LVDT body, four redundant LVDT demodulators and four redundant servo amplifiers, wherein the LVDT refers to an existing linear displacement sensor;

the four redundant coils are arranged in the bidirectional proportional electromagnet and connected to the pilot slide valve, the pilot slide valve is connected with the power level slide valve, the LVDT body is arranged on the power level slide valve, the four redundant LVDT demodulator is connected with the LVDT body and the four redundant servo amplifier, and the four redundant servo amplifier is connected with the bidirectional proportional electromagnet.

Preferably, the power stage spool valve comprises: the valve comprises a left end cover, a shell, a valve sleeve, a valve core and a right end cover;

the shell is connected with the pilot slide valve, the valve sleeve is arranged in the shell, two ends of the valve sleeve are arranged between the left end cover and the right end cover, and the left end cover and the right end cover are fixedly arranged on the shell;

the valve core is arranged in the valve sleeve, the pilot spool is communicated with the valve sleeve, and oil of the pilot spool flows into two ends of the valve sleeve and drives the valve core to linearly move relative to the valve sleeve.

Preferably, one end of the valve core is provided with a mounting disc through a screw, a cushion block is arranged between the mounting disc and the valve core, and a bearing is arranged between the mounting disc and the screw.

Preferably, the measuring head is connected to one end of a connecting rod, and the other end of the connecting rod is mounted on the mounting plate.

Preferably, the measuring head and the connecting rod are provided in plurality and are uniformly distributed circumferentially on the mounting plate.

Preferably, a magnetism isolating sleeve is arranged on the outer side of the measuring head, and the magnetism isolating sleeve is fixedly arranged on the left end cover.

Preferably, a sealing ring is arranged between the left end cover, the right end cover and the valve sleeve and the shell, and a sealing ring is arranged between the magnetism isolating sleeve and the left end cover.

Preferably, the outer side of the magnetism isolating sleeve is connected with the LVDT body, and the LVDT body is isolated from oil liquid at the measuring head through the magnetism isolating sleeve.

Preferably, the oil path of the pilot spool is connected to two ends of the valve core through the process holes of the shell, and plugs are installed at the process holes at the two ends of the shell;

and the protective cover is arranged on the left end cover, and the LVDT body is arranged between the left end cover and the protective cover.

Preferably, the four redundant servo amplifier is provided with a plurality of groups of independent signal input ports, a zeroing module and a power driving module, and each group of signal input ports, zeroing modules and power driving modules corresponds to one coil of the four redundant coils.

Compared with the prior art, the invention has the following beneficial effects:

1. the four-redundancy design is adopted for three key parts of an electric part (four-redundancy coil), an electric feedback part (LVDT body and a measuring head arranged on a valve core) and a servo amplifier of the servo valve taking the direct-drive valve as a guide, so that the reliability of the electro-hydraulic servo valve is greatly improved;

2. only the redundancy of an electric part (four redundancy coils) is adopted in the pilot valve, but not the redundancy of the whole pilot stage, so that the pilot valve has a weak coupling effect, and the debugging difficulty is greatly reduced;

3. four groups of LVDTs in the electric feedback adopt circumferential structural layout, and a measuring head cannot be damaged when a valve core rotates, so that the four groups of LVDTs have higher reliability.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of the overall structure of a four redundant two-stage servo valve;

FIG. 2 is a partial cross-sectional view of an LVDT body coupling magnetism isolating sleeve;

FIG. 3 is an end view of an LVDT body coupling magnetism isolating sleeve;

FIG. 4 is a schematic view of the structure of the probe on the valve core;

FIG. 5 is a schematic diagram of a four redundant two-stage servo valve;

the figure shows:

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

Example 1

As shown in fig. 1, the present embodiment includes: the two-way proportional electromagnet 1, the four redundant coils 2, the pilot spool 3, the LVDT body 6, the four redundant LVDT demodulators 20 and the four redundant servo amplifiers 21; the four redundant coils 2 are arranged in the bidirectional proportional electromagnet 1 and then connected with the pilot slide valve 3, the pilot slide valve 3 is connected with the power level slide valve, the LVDT body 6 is arranged on the power level slide valve, the four redundant LVDT demodulator 20 is connected with the LVDT body 6 and the four redundant servo amplifier 21, and the four redundant servo amplifier 21 is connected with the bidirectional proportional electromagnet 1. The four redundant servo amplifier 21 is provided with a plurality of independent signal input ports, a zeroing module and a power driving module, and each of the plurality of independent signal input ports, the zeroing module and the power driving module corresponds to one of the four redundant coils 2.

The power stage spool valve includes: a left end cover 7, a shell 8, a valve sleeve 9, a valve core 10 and a right end cover 12; the casing 8 is arranged on the pilot spool 3, the valve sleeve 9 is arranged in the casing 8, the left end cover 7 and the right end cover 12 are arranged at two ends of the valve sleeve 9, the left end cover 7 and the right end cover 12 are fixedly arranged on the casing 8, the valve core 10 is arranged in the valve sleeve 9, an oil path of the pilot spool 3 is communicated with the valve sleeve 9, and oil of the pilot spool 3 flows into two ends of the valve sleeve 9 and drives the valve core 10 to linearly move relative to the valve sleeve 9. The oil path of the pilot spool 3 is connected to the two ends of the valve core 10 through the process holes of the shell 8, and plugs 4 are arranged at the tail ends of the left and right process holes of the shell 8.

As shown in fig. 4, one end of the valve core 10 is provided with a mounting plate 16 by a screw 17, a cushion block 19 is arranged between the mounting plate 16 and the valve core 10, and a bearing 18 is arranged between the mounting plate 16 and the screw 17. The gauge head 14 is connected connecting rod 15 one end, and the connecting rod 15 other end is installed on mounting plate 16, and gauge head 14 and connecting rod 15 are provided with a plurality of and circumference evenly distributed on mounting plate 16.

The outside of the measuring head 14 is provided with a magnetism isolating sleeve 13, and the magnetism isolating sleeve 13 is fixedly arranged on the left end cover 7. A sealing ring 11 is arranged between the left end cover 7, the right end cover 12, the valve sleeve 9 and the shell 8, and a sealing ring 11 is arranged between the magnetism isolating sleeve 13 and the left end cover 7.

As shown in fig. 2 and 3, the outer side of the magnetism isolating sleeve 13 is connected with the LVDT body 6, and the LVDT body 6 is isolated from oil liquid at the measuring head 14 by the magnetism isolating sleeve 13.

Example 2

Example 2 is a preferred example of example 1.

As shown in fig. 1 to 4, the present embodiment includes: a bidirectional proportional solenoid 1 with four redundant coils 2, a pilot spool 3, a power stage spool, an LVDT body 6, a four redundant LVDT demodulator 20, and a four redundant servo amplifier 21.

The bidirectional proportional electromagnet 1 is driven by four redundant coil windings, the four windings are in a parallel structure, under the bidirectional current drive of the four redundant servo amplifier 21, the bidirectional proportional electromagnet 1 can move bidirectionally, the valve core inside the pilot slide valve 3 can be pushed to move relative to the valve sleeve, flow regulation is realized, and the flow is transmitted to the two ends of the valve core 10 of the power stage slide valve.

The pilot spool 3 and the bidirectional proportional electromagnet 1 form a direct-drive valve, the direct-drive valve is used as a pilot stage of a large-flow servo valve, two output cavities of the pilot spool 3 are connected to two cavities of a power stage spool, and the two cavities of the power stage spool are respectively connected to oil inlet and oil return of a hydraulic system; the pilot spool 3 and the power stage spool adopt spool structures, and take the power stage spool as an example, the magnitude of output flow is controlled by adjusting the relative openings of the spool 10 and the valve sleeve 9. Under the drive of the oil of the pilot spool valve 3, the spool 10 of the power-stage spool valve moves relative to the valve sleeve 9, so that the valve port is opened and closed, and the high-power flow output is controlled.

The valve sleeve 9 in the power level slide valve is arranged in the shell 8, the valve sleeve 9 is fastened by the left end cover 7 and the right end cover 12, and the sealing of an oil way is realized.

Four LVDT measuring heads 14 are arranged at one end of the valve core 10 of the power level slide valve, and the four measuring heads 14 are uniformly distributed along the axial line of the valve core 10 in the circumferential direction and can rotate around the axial center of the valve core 10; and a magnetism isolating sleeve 13 is arranged outside each measuring head 14, the magnetism isolating sleeves 13 are fastened on the threads of the left end cover 7, the four LVDT bodies 6 are fixed outside the magnetism isolating sleeves 13, and the magnetism isolating sleeves 13 are used for isolating the LVDT bodies 6 from oil in the measuring heads 14.

The measuring head 14 is mounted at the end of a connecting rod 15, and the connecting rod 15 is fixed on a mounting plate 16 in a threaded connection or interference press fit manner and is uniformly arranged in a circumference. The mounting plate 16 is connected to one end of the valve core 10 by a screw 17, a spacer 19 is arranged between the mounting plate 16 and the valve core 10, a bearing 18 is provided between the mounting plate 16 and the screw 17, and the mounting plate 16 is rotatable circumferentially along the axis of the screw 17 by the bearing 18 but is not allowed to move in the axial direction.

As shown in fig. 5, the four-way redundant servo amplifier 21 has four independent signal input ports, a zeroing module and a power driving module, and the four independent power driving modules of the four-way redundant servo amplifier 21 respectively drive four-way coils in the direct-drive valve.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.

The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims

1. A four redundant two-stage servo valve with a direct drive valve as a pilot, comprising: the bidirectional proportional electromagnet (1), a four-redundant coil (2), a pilot spool (3), an LVDT body (6), a four-redundant LVDT demodulator (20) and a four-redundant servo amplifier (21);

the four-redundancy coil (2) is arranged in the bidirectional proportional electromagnet (1) and connected to the pilot slide valve (3), the pilot slide valve (3) is connected with the power level slide valve, the LVDT body (6) is arranged on the power level slide valve, the four-redundancy LVDT demodulator (20) is connected with the LVDT body (6) and the four-redundancy servo amplifier (21), and the four-redundancy servo amplifier (21) is connected with the bidirectional proportional electromagnet (1).

2. The direct-drive valve piloted four redundant two-stage servo valve of claim 1, wherein the power stage spool valve comprises: a left end cover (7), a shell (8), a valve sleeve (9), a valve core (10) and a right end cover (12);

the shell (8) is connected with the pilot slide valve (3), the valve sleeve (9) is arranged in the shell (8), two ends of the valve sleeve (9) are arranged between the left end cover (7) and the right end cover (12), and the left end cover (7) and the right end cover (12) are fixedly arranged on the shell (8);

the valve core (10) is arranged in the valve sleeve (9), the pilot spool (3) is communicated with the valve sleeve (9), and oil of the pilot spool (3) flows into two ends of the valve sleeve (9) and drives the valve core (10) to linearly move relative to the valve sleeve (9).

3. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 2, characterized in that: one end of the valve core (10) is provided with a mounting disc (16) through a screw (17), a cushion block (19) is arranged between the mounting disc (16) and the valve core (10), and a bearing (18) is arranged between the mounting disc (16) and the screw (17).

4. A four-redundant two-stage servo valve piloted by a direct drive valve according to claim 3, wherein: the measuring head (14) is connected to one end of the connecting rod (15), and the other end of the connecting rod (15) is arranged on the mounting disc (16).

5. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 4, wherein: the measuring heads (14) and the connecting rods (15) are provided with a plurality of measuring heads and are uniformly distributed on the mounting plate (16) in the circumferential direction.

6. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 4, wherein: the outside of the measuring head (14) is provided with a magnetism isolating sleeve (13), and the magnetism isolating sleeve (13) is fixedly arranged on the left end cover (7).

7. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 6, wherein: the magnetic shielding sleeve is characterized in that a sealing ring (11) is arranged between the left end cover (7), the right end cover (12), the valve sleeve (9) and the shell (8), and the sealing ring (11) is arranged between the magnetic shielding sleeve (13) and the left end cover (7).

8. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 6, wherein: the outside of the magnetism isolating sleeve (13) is connected with the LVDT body (6), and the LVDT body (6) is isolated from oil liquid at the measuring head (14) through the magnetism isolating sleeve (13).

9. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 2, characterized in that: the oil way of the pilot slide valve (3) is connected to the two ends of the valve core (10) through the process holes of the shell (8), and plugs (4) are arranged at the process holes at the two ends of the shell (8);

and the protective cover (5) is arranged on the left end cover (7), and the LVDT body (6) is arranged between the left end cover (7) and the protective cover (5).

10. The four-redundant two-stage servo valve piloted by a direct drive valve according to claim 1, wherein: the four redundant servo amplifier (21) is provided with a plurality of groups of independent signal input ports, a zeroing module and a power driving module, and each group of signal input ports, zeroing modules and power driving modules corresponds to one coil of the four redundant coils (2).