CN111237296A - Capillary throttling arrangement with adjustable hydraulic resistance based on piezoelectric actuator - Google Patents

Abstract

The invention discloses a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator, comprising a casing with an open lower end, an oil outlet opening on the upper end of the casing, a spiral ring groove f in the middle of the inner wall of the casing, The side of the helical ring groove f is provided with an oil inlet hole; the piston rod is movably embedded in the casing, and the piston rod is provided with a helical ring groove g that cooperates with the helical ring groove f to form a capillary, and the upper end of the piston rod is fixedly connected to the push plate, The other end of the push plate compresses the butterfly spring II installed in the spring seat a, the spring seat a is fixed in the shell; the lower end of the piston rod is fixedly connected to the piezoelectric sensor, the lower end of the piezoelectric sensor is fixed to the spring seat b, and the inner end of the spring seat b is fixed A butterfly spring is fixedly installed, a ball spacer, a sphere and a lower connecting block, the lower end of the lower connecting block is fixedly connected to the piezoelectric actuator, the lower end of the piezoelectric actuator is connected to a thrust ball bearing, and the thrust ball bearing is fixedly connected to the adjusting bolt. By changing the length of the capillary flow channel, the liquid resistance of the capillary can be adjusted.

Description

A liquid resistance adjustable capillary throttling device based on piezoelectric actuator

technical field

The invention belongs to the technical field of capillary throttling, and relates to a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator.

Background technique

With the continuous development of bearings, the throttle has also developed a variety of. The restrictor is a component that controls the flow of fluid and produces a pressure drop. The working principle is simply to reduce or increase the area of the cross section to achieve flow regulation.

At present, the throttle can be divided into two types: fixed throttle and variable throttle. Fixed restrictors mainly include small orifice restrictors, capillary restrictors and slit restrictors, etc. Variable restrictors mainly include membrane feedback restrictors, slide valve restrictors, etc. Its liquid resistance is in addition to throttling In addition to the structural parameters of the device, it is also affected by external conditions, which often change during the working process. The main feature of the fixed restrictor is that the liquid resistance is only related to the structural parameters of the restrictor itself. It does not change with the change of external conditions during the working process. The working state of the capillary restrictor is laminar flow, so this limits the working conditions of the fixed restrictor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator, which solves the problem that the liquid resistance of the fixed restrictor existing in the prior art is only related to the structural parameters of the restrictor itself, In the working process, it does not change with the change of external conditions, and the working conditions are limited.

The technical scheme adopted by the present invention is that a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator comprises a casing with an open lower end, an oil outlet hole is formed on the upper end of the casing, and a spiral ring groove is arranged in the middle of the inner wall of the casing f, the casing is provided with an oil inlet hole on the side of the helical ring groove f; the piston rod is movably embedded in the casing, and the piston rod is provided with a helical ring groove g that cooperates with the helical ring groove f to form a capillary, and the upper end of the piston rod The push plate is fixedly connected, and the other end of the push plate compresses the butterfly spring II installed in the spring seat a, and the spring seat a is fixed in the shell; the lower end of the piston rod is fixedly connected to the piezoelectric sensor, and the lower end of the piezoelectric sensor is fixed to the spring seat b , the spring seat b is fixedly installed with a butterfly spring I, a ball spacer, a sphere and a lower connecting block. The lower end of the lower connecting block is fixedly connected to the piezoelectric actuator, and the lower end of the piezoelectric actuator is connected to a thrust ball bearing. Adjusting bolts are fastened.

The feature of the present invention also lies in:

The spring seat a is fastened to the upper end inside the casing by means of bolts e.

An adjusting nut is fixedly connected in the spring seat a of the second lower part of the butterfly spring.

A baffle plate is also installed between the second butterfly spring installed in the spring seat a and the push plate, and the baffle plate is installed on the adjusting nut.

An O-ring is installed on the outside of the piston rod.

The upper end of the piston rod is fixed to the push plate through four bolts c.

The lower end of the piston rod is threadedly connected with the piezoelectric sensor, and the lower end of the piezoelectric sensor is threadedly connected to the spring seat b. The spring seat b is fixedly installed with a butterfly spring I, a ball spacer, a sphere, a lower connecting block, and a lower connecting block from top to bottom. The lower end is screwed to the piezoelectric actuator.

The lower end of the thrust ball bearing is fixedly embedded in the top end of the adjusting bolt, the end of the screw is fixedly installed in the thrust ball bearing, and the threaded part of the screw is screwed into the threaded hole at the lower part of the piezoelectric actuator.

The beneficial effects of the present invention are as follows: the present invention is a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator, the liquid resistance ratio is adjustable, and laminar flow throttling can be formed, the grooves on the surface of the piston rod and the grooves on the inner surface of the shell Alignment can form a complete capillary loop. By changing the length of the capillary flow channel, the liquid resistance of the capillary is changed, and the use conditions of the capillary restrictor are improved.

Description of drawings

1 is a schematic structural diagram of a piezoelectric actuator-based liquid resistance adjustable capillary throttling device of the present invention;

2 is a cross-sectional view of a piezoelectric actuator-based capillary throttling device with adjustable liquid resistance according to the present invention.

In the figure, 1. Shell, 2. Spring seat a, 3. Helical ring groove f, 4. Bolt c, 5. Piston rod, 6. Piezoelectric sensor, 7. Spring seat b, 8. Piezoelectric actuator , 9. Thrust ball bearing, 10. Adjusting bolt, 11. Screw, 12. Lower connecting block, 13. Ball, 14. Ball spacer, 15. One butterfly spring, 16. O-ring, 17. Spiral Ring groove g, 18. oil inlet hole, 19. push plate, 20. adjusting nut, 21. baffle plate, 22. butterfly spring two, 23. oil outlet hole, 24. bolt e.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A liquid resistance adjustable capillary throttling device based on a piezoelectric actuator of the present invention, as shown in Figures 1 and 2, comprises a casing 1 with an open lower end, an oil outlet hole 23 is formed on the upper end of the casing 1, and a middle part of the inner wall of the casing 1 is provided There is a helical ring groove f3, and an oil inlet hole 18 is provided on the side of the helical ring groove f3 on the casing 1; the piston rod 5 is movably embedded in the casing 1, and the piston rod 5 is provided with a capillary in cooperation with the helical ring groove f3. The upper end of the piston rod 5 is fixed to the push plate 19, and the other end of the push plate 19 compresses the butterfly spring II 22 installed in the spring seat a2, and the spring seat a2 is fixed in the casing 1; the piston rod 5 The lower end is fixedly connected to the piezoelectric sensor 6, the lower end of the piezoelectric sensor 6 is fixedly connected to the spring seat b7, and the spring seat b7 is fixedly installed with a butterfly spring 15, a ball spacer 14, a sphere 13 and a lower connecting block 12, and the lower end of the lower connecting block 12 is installed. The piezoelectric actuator 8 is fixedly connected, and the lower end of the piezoelectric actuator 8 is connected with a thrust ball bearing 9 , and the thrust ball bearing 9 is fixedly connected with the adjusting bolt 10 .

The spring seat a2 is fixed to the upper end inside the casing 1 through the bolt e24.

An adjusting nut 20 is fixedly connected in the spring seat a2 at the lower part of the second butterfly spring 22 , and the adjusting nut 20 is used to fix the extended position of the second butterfly spring 22 .

A baffle plate 21 is also installed between the butterfly spring II 22 installed in the spring seat a2 and the push plate 19 , and the baffle plate 21 is installed on the adjusting nut 20 .

An O-ring 16 is installed on the outer side of the piston rod 5, and the O-ring 16 plays a sealing role to ensure that no leakage or overflow occurs when the oil enters the capillary.

The upper end of the piston rod 5 is fixedly connected to the push plate 19 through four bolts c4.

The lower end of the piston rod 5 is threadedly connected to the piezoelectric sensor 6, and the lower end of the piezoelectric sensor 6 is threadedly connected to the spring seat b7. The spring seat b7 is fixedly installed with a butterfly spring 15, a ball spacer 14, a ball 13 and a lower The connection block 12 is connected to the piezoelectric actuator 8 by screwing the lower end of the lower connection block 12 .

The lower end of the thrust ball bearing 9 is fixedly embedded in the top end of the adjusting bolt 10 , the end of the screw 11 is fixedly installed in the thrust ball bearing 9 , and the threaded part of the screw 11 is screwed into the threaded hole in the lower part of the piezoelectric actuator 8 . The adjustment bolt 10 is used for coarse adjustment, and it is used in conjunction with the piezoelectric actuator 8 to make the throttle work better. The piezoelectric actuator 8 is finely adjusted. When the piezoelectric actuator 8 works, the piston rod 5 moves, and the piston rod 5 and the casing 1 form a complete capillary circuit, and then drive the push plate 19 against the butterfly spring 22 , so that the butterfly spring 22 is compressed. The function of the thrust ball bearing 9 is to bear the axial load generated by the adjusting bolt 10 to drive the piezoelectric actuator 8 to work.

The present invention is a liquid resistance adjustable capillary throttling device based on a piezoelectric actuator, and its working principle is as follows:

When the oil enters from the oil inlet hole 18, the adjusting bolt 10 is rotated to drive the thrust ball bearing 9 to start working, so that the piezoelectric actuator 8 is stretched by force, and the lower connecting block 12 pushes the ball 13 to press the ball spacer 14. When the butterfly spring 1 15 is pressed, the butterfly spring 1 15 compresses, pushes the piezoelectric sensor 6 to move, the piston rod 5 moves upward, and drives the push plate 19 to move upward. 22 compression, the helical ring groove f3 on the piston rod 5 is aligned with the helical ring groove g17 on the casing 1 to form a complete capillary circuit, the oil passes through the capillary circuit and finally flows out through the oil outlet hole 23.

A liquid resistance adjustable capillary throttling device based on a piezoelectric actuator of the present invention has the beneficial effects that the liquid resistance ratio of the present invention can be adjusted, and laminar flow throttling can be formed. The grooves can be aligned to form a complete capillary loop. By changing the length of the capillary flow channel, the liquid resistance of the capillary is changed, and the use conditions of the capillary restrictor are improved.

Claims (8)

1. A liquid resistance adjustable capillary throttling device based on a piezoelectric actuator, characterized in that it comprises an outer casing (1) with an opening at the lower end, and the upper end of the outer casing (1) is provided with an oil outlet (23), and the outer casing (1) is provided with an oil outlet (23). ) A helical ring groove f(3) is arranged in the middle of the inner wall, and an oil inlet hole (18) is provided on the side of the outer casing (1) on the side of the helical ring groove f(3); a piston rod (18) is movably embedded in the casing (1). 5), the piston rod (5) is provided with a helical ring groove g (17) that cooperates with the helical ring groove f (3) to form a capillary, and the upper end of the piston rod (5) is fixedly connected to the push plate (19), pushing the The other end of the plate (19) compresses the disc spring two (22) installed in the spring seat a (2), the spring seat a (2) is fixed in the housing (1); the lower end of the piston rod (5) is fixedly connected to press The lower end of the electric sensor (6) and the piezoelectric sensor (6) is fixedly connected to the spring seat b (7), and the spring seat b (7) is fixedly installed with a butterfly spring (15), a ball spacer (14), and a sphere (13). ) and the lower connecting block (12), the lower end of the lower connecting block (12) is fixedly connected to the piezoelectric actuator (8), the lower end of the piezoelectric actuator (8) is connected to the thrust ball bearing (9), and the thrust ball bearing (9) Fix it with the adjusting bolt (10). 2. A kind of liquid resistance adjustable capillary throttling device based on piezoelectric actuator according to claim 1, characterized in that, the spring seat a (2) is fixed on the outer casing (24) through the bolt e (24). 1) The upper end of the interior. 3. A piezoelectric actuator-based liquid resistance adjustable capillary throttling device according to claim 1, characterized in that, the spring seat a (2) located at the lower part of the two butterfly springs (22) is internally fixed An adjusting nut (20) is connected. 4. A kind of liquid resistance adjustable capillary throttling device based on piezoelectric actuator according to claim 3, characterized in that, the two butterfly springs (22) installed in the spring seat a (2) and the A baffle plate (21) is also installed between the push plates (19), and the baffle plate (21) is installed on the adjusting nut (20). 5. The piezoelectric actuator-based liquid resistance adjustable capillary throttling device according to claim 1, wherein an O-ring (16) is installed on the outer side of the piston rod (5). 6 . The liquid resistance adjustable capillary throttling device based on a piezoelectric actuator according to claim 1 , wherein the upper end of the piston rod ( 5 ) is fixedly connected by four bolts c ( 4 ). 7 . Push plate (19). 7 . The liquid resistance adjustable capillary throttling device based on a piezoelectric actuator according to claim 1 , wherein the lower end of the piston rod (5) is threadedly connected with the piezoelectric sensor (6), and the pressure is threaded. 8 . The lower end of the electric sensor (6) is threadedly connected to the spring seat b (7), and a butterfly spring (15), a ball spacer (14), a sphere (13) and The lower connection block (12) is screwed to the lower end of the lower connection block (12) to connect the piezoelectric actuator (8). 8. The piezoelectric actuator-based liquid resistance adjustable capillary throttling device according to claim 7, wherein the lower end of the thrust ball bearing (9) is fixedly embedded in the adjusting bolt (10) The top end of the screw (11) is fixedly installed in the thrust ball bearing (9), and the threaded part of the screw (11) is screwed into the threaded hole at the lower part of the piezoelectric actuator (8).

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