CN112483721A

CN112483721A - Valve needle conical surface sealing type micro-flow giant magnetostrictive proportional valve

Info

Publication number: CN112483721A
Application number: CN202011466342.4A
Authority: CN
Inventors: 苗建忠; 潘胜鹏; 龚锐
Original assignee: Guizhou Mangwei Fluid Intelligent Technology Co ltd
Current assignee: Guizhou Mangwei Fluid Intelligent Technology Co ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-03-12

Abstract

The invention provides a valve needle conical surface sealing type micro-flow giant magnetostrictive proportional valve which comprises a valve body, a magnetism isolating ring and a pole shoe which are sequentially connected from left to right, wherein a coil assembly is sleeved on the magnetism isolating ring, a plug is arranged in the pole shoe, a valve seat is arranged in the plug, a valve core is arranged in the valve body, a valve needle is arranged at the right end of the valve core, a conical sealing surface is correspondingly arranged at one side, close to a valve hole, of the valve needle, a supporting cylinder and a giant magnetostrictive cylinder are sleeved on the valve core, a shoulder structure is arranged at the left end of the valve core, the right end of the shoulder structure is in contact with the supporting cylinder, and. Compared with the original micro flow proportional valve, the micro flow proportional valve has the advantages of large adjusting range and high adjusting precision; the micro opening of the valve can be controlled proportionally, the control precision is high, the sealing performance is good, the service life is long, and the opening change linearity of the valve is good; the valve has the advantages of high response speed, good repeatability and high reliability.

Description

Valve needle conical surface sealing type micro-flow giant magnetostrictive proportional valve

Technical Field

The invention relates to the technical field of valves, in particular to a conical surface sealing type micro-flow giant magnetostrictive proportional valve with a valve needle.

Background

The pressure control and flow control are important links of attitude and orbit control power systems of the aerospace craft, in particular to the field of micro propulsion of micro satellites and deep space probes, such as electric propulsion systems and cold air propulsion systems. During attitude control and orbital transfer control, the required output thrust is milli-Newton or micro-Newton. For the requirement, the current general practice is to arrange a micro-flow throttling nozzle behind the electromagnetic valve, and limit the flow through the throttling nozzle, so that the engine can only generate a constant thrust, the thrust cannot be adjusted according to the requirement, and the thrust is too small. Although a current proportion long column type flow valve and a piezoelectric ceramic proportion valve are also developed, the proportion electromagnet is not high in sensitivity and large in hysteresis loop, so that proportion control is difficult to realize, and the maneuverability and the service life of a propulsion system are greatly limited; the piezoelectric ceramic proportional valve has a complex structure and small output force, and is not widely used.

For example, chinese patent publication No. CN106641374A discloses a micro-flow piezoelectric ceramic proportional valve, which includes an upper casing and a lower casing, the upper casing and the lower casing are connected by bolts, a piezoelectric ceramic component is disposed in the lower casing, an inlet connector is disposed at the upper end of the piezoelectric ceramic component, a valve needle is disposed at the lower end of the piezoelectric ceramic component, the piezoelectric ceramic component is a plurality of piezoelectric ceramic pieces mounted in the lower casing by mounting rings, and when the valve is powered on, the piezoelectric ceramic pieces deform to drive the valve needle to move, thereby causing the change of the valve opening. However, the piezoelectric ceramic piece of the proportional valve needs to be installed in the lower shell by using an installation ring, and when the piezoelectric ceramic piece of the proportional valve deforms, the material stretches out and draws back from the upper direction and the lower direction, so that only a part of deformation acts on the valve needle, and the movable range of the valve needle is too small; to increase the adjustment range, the thickness and the number of the piezoelectric ceramic pieces need to be greatly increased, and the volume and the weight of the valve are greatly increased. In addition, the deformation of the piezoelectric ceramic piece is enough to drive the valve needle to conduct the valve, and meanwhile, the valve needle is in a valve closing state when the piezoelectric ceramic piece is not deformed, a certain pressure needs to be accurately controlled during assembly, the deformation and output of the piezoelectric ceramic piece are small, the adaptive capacity to the pressure is poor, and the assembly of the proportional valve is difficult greatly.

Disclosure of Invention

In order to solve the technical problem, the invention provides a conical surface sealing type micro-flow super-magnetostrictive proportional valve of a valve needle.

The invention is realized by the following technical scheme.

The invention provides a valve needle conical surface sealing type micro-flow giant magnetostrictive proportional valve which comprises a valve body, a magnetism isolating ring and a pole shoe, wherein the valve body, the magnetism isolating ring and the pole shoe are sequentially connected from left to right, a coil assembly is sleeved on the magnetism isolating ring, a plug is arranged in the pole shoe, a valve seat is arranged in the plug, a valve hole is arranged in the valve seat and communicated with an inner cavity of the valve body, a fluid inlet is formed in the valve body, a valve core is arranged in the valve body, a valve needle is arranged at the right end of the valve core, a conical sealing surface is correspondingly arranged on one side, close to the valve hole, of the valve needle, a supporting cylinder and a giant magnetostrictive cylinder are sleeved on the valve core, the axial position of the giant magnetostrictive cylinder is at least partially overlapped with the magnetism isolating ring.

And a pressing part is also arranged between the left end surface of the supporting cylinder and the wall surface of the valve body.

The compressing component is a second spring, and a second spring gasket is arranged between the second spring and the valve body.

The pole shoe is cylindrical with an outward flange, the right end of the coil assembly is in contact with the outward flange of the pole shoe, and the left end of the coil assembly at least covers one part of the valve body.

The coil assembly comprises a coil and a coil sleeve, insulating glue is arranged between the coil and the magnetism isolating ring, a wiring terminal is arranged on the end face of the coil sleeve in a penetrating mode, and the wiring terminal is connected with the coil.

The left end of the coil sleeve is provided with an inner flanging structure, and the inner flanging structure is in contact with the valve body.

The valve seat is in threaded connection with the plug, and a sealing ring is arranged at the left end of the valve seat.

And the valve seat is also provided with a locking nut.

And a straight pipe is arranged at the left end of the valve body.

The inclination of the conical sealing surface of the valve needle is the same as that of the conical sealing surface of the valve hole, and the diameter of the large end of the valve needle is larger than that of the valve hole.

The reset component is a first spring, and a first spring gasket is arranged between the first spring and the valve body.

A gap is arranged between the valve core and the giant magnetostrictive cylinder, and a fluid channel is arranged on the supporting cylinder to communicate the gap with the fluid inlet.

The valve body and the magnetism isolating ring are welded, the magnetism isolating ring and the pole shoe are welded, the pole shoe and the plug are welded, and the pole shoe and the coil sleeve are welded.

The invention has the beneficial effects that:

compared with the prior art, the invention has the following advantages: (1) the opening of the valve can be adjusted by adjusting the current, and the fluid flow and the pressure are adjusted in proportion, so that the adjusting range is large and the adjusting precision is high compared with the original micro-flow proportional valve; (2) the proportional control of the micro opening of the valve can be realized, the control precision is high, and the proportional characteristic cannot be attenuated along with the use; (3) because the output force of the giant magnetostrictive material is large, the valve needle and the valve hole 17 can be sealed by a metal conical surface, the sealing performance is good, the service life is long, and the valve opening change linearity is good; (4) the motion rigidity and the dynamic stability of the giant magnetostrictive material are good, so that the response repeatability and the reliability of the valve are good; (5) the magnetic field is adopted to control the displacement of the valve core, and current is not required to be directly introduced into the valve body, so that the safety is improved; (6) the periphery of the valve needle is provided with a fluid concentration space, so that the pressure of the fluid is uniformly distributed, and the pressure mutation at the opening and closing moment of the valve is avoided; (7) because the giant magnetostrictive material has infinite displacement resolution, the micro opening of the valve can be proportionally controlled by applying current, and the control precision is higher.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a diagram showing the relationship between the expansion coefficient and the electromagnetic strength of the giant magnetostrictive material under different pre-pressures.

In the figure: 1-a valve body; 2-a reset component; 3-a pressing part; 4-a valve core; 5-a support cylinder; 6-giant magnetostrictive cylinder; 7-magnetism isolating ring; 8-a coil assembly; 9-pole shoe; 10-plug; 11-a valve seat; 12-a coil; 13-a coil housing; 14-insulating glue; 15-a terminal post; 16-a valve needle; 17-a valve bore; 18-a sealing ring; 19-a locking nut; 20-shoulder construction; 21-a first spring washer; 22-a second spring washer; 23-straight tube.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

Fig. 1 shows a schematic structural diagram of the present invention:

the invention provides a valve needle conical surface sealing type micro-flow super-magnetostrictive proportional valve, which comprises a valve body 1, a magnetism isolating ring 7 and a pole shoe 9 which are connected in sequence from left to right, the magnetic isolation ring 7 is sleeved with a coil component 8, a plug 10 is arranged in the pole shoe 9, a valve seat 11 is arranged in the plug 10, a valve hole 17 is arranged in the valve seat 11 and communicated with the inner cavity of the valve body 1, the high-pressure-resistance valve is characterized in that a fluid inlet is formed in the valve body 1, a valve core 4 is arranged in the valve body 1, a valve needle 16 is arranged at the right end of the valve core 4, a conical sealing surface is correspondingly arranged on one side, close to a valve hole 17, of the valve needle 16, a supporting cylinder 5 and a giant magnetostrictive cylinder 6 are sleeved on the valve core 4, the axial position of the giant magnetostrictive cylinder 6 is at least partially overlapped with a magnetic isolation ring 7, a shoulder structure 20 is arranged at the left end of the valve core 4, a gap between the right end of the shoulder structure 20 and the supporting cylinder 5 is not larger than 0.0015mm, and a reset component 2 is.

The gap between the right end of the shoulder structure 20 and the support cylinder 5 is 0.0015-0.0005 mm. When the giant magnetostrictive cylinder 6 pushes the support cylinder 5 to contact with the shoulder structure, the variation relation between the elongation of the giant magnetostrictive cylinder 6 and the magnetic field intensity enters a linear variation range, so that the opening of the valve can be accurately controlled.

When the valve is to be opened, the coil assembly 8 is electrified to generate a magnetic field, the giant magnetostrictive cylinder 6 extends under the action of the magnetic field, the left end pushes the support cylinder 5 to drive the valve core 4 to move leftwards, so that the valve needle 16 leaves the valve hole 17, and the valve is opened; the magnetic field force is changed along with the current, so that the elongation of the giant magnetostrictive cylinder 6 can be controlled by the current proportion, and the opening of the valve can be controlled proportionally. When the valve is closed, the current is cut off, the magnetic field disappears, and the valve core 4 moves rightwards under the action of the resetting component 2, so that the valve needle 16 is inserted into the valve hole 17 to form sealing.

Compared with the prior art, the invention has the following advantages: the opening of the valve can be adjusted by adjusting the current, and the fluid flow and the pressure are adjusted in proportion, so that the adjusting range is large and the adjusting precision is high compared with the original micro-flow proportional valve; the proportional control of the micro opening of the valve can be realized, the control precision is high, and the proportional characteristic cannot be attenuated along with the use; because the output force of the giant magnetostrictive material is large, the valve needle 16 and the valve hole 17 can be sealed by metal conical surfaces, the sealing performance is good, the service life is long, and the valve opening change linearity is good; due to the movement rigidity and the dynamic stability of the giant magnetostrictive material, the valve has high response speed, good repeatability and high reliability; the displacement of the valve core 4 is controlled by adopting a magnetic field, and current is not required to be directly introduced into the valve body 1, so that the safety is improved; a fluid concentration space is arranged around the valve needle 16, so that the pressure of the fluid is uniformly distributed, and sudden pressure change of the valve in the opening and closing moment is avoided; because the giant magnetostrictive material has infinite displacement resolution, the micro opening of the valve can be proportionally controlled by applying current, and the control precision is higher.

And a pressing part 3 is also arranged between the left end surface of the supporting cylinder 5 and the wall surface of the valve body 1. The pressing part 3 presses the supporting cylinder 5 to form pre-pressure on the giant magnetostrictive cylinder 6, so that the telescopic performance of the giant magnetostrictive cylinder is improved. As shown in fig. 2, which is a curve of the relationship between the amount of stretching and the electromagnetic strength of the giant magnetostrictive material under different pre-pressures, in the graph, λ is a giant magnetostrictive coefficient, and it can be seen that after the pre-pressure is increased, the stretching performance of the giant magnetostrictive cylinder 6 is obviously improved, and the requirement of the magnetic field strength is reduced.

The pressing part 3 is a second spring, and a second spring gasket 22 is arranged between the second spring and the valve body 1. The second spring is used for applying pre-pressure to the giant magnetostrictive material, and the second spring as a pre-pressure part occupies small space, has high frequency response and high rigidity, and is beneficial to reducing the volume of the proportional valve.

The pole shoe 9 is cylindrical with an outward flange, the right end of the coil component 8 is in contact with the outward flange of the pole shoe 9, and the left end of the coil component 8 at least covers one part of the valve body 1. The magnetic field forms a circle of closed loop through the pole shoe 9, the valve seat 11, the giant magnetostrictive cylinder 6, the valve body 1 and the coil assembly 8, and the utilization rate of the magnetic field is improved.

The coil assembly 8 comprises a coil 12 and a coil sleeve 13, an insulating glue 14 is arranged between the coil 12 and the magnetism isolating ring 7, a wiring terminal 15 is arranged on the end face of the coil sleeve 13 in a penetrating mode, and the wiring terminal 15 is connected with the coil 12. The terminals 15 facilitate connection of the coil 12 to external control circuitry.

The left end of the coil sleeve 13 is provided with an inner flanging structure, and the inner flanging structure is in contact with the valve body 1. Two ends of the coil 12 are respectively conducted with magnetism through the valve body 1 and the pole shoe 9 to form a closed magnetic circuit of the coil sleeve 13, the pole shoe 9, the plug 10, the giant magnetostrictive cylinder 6, the support cylinder 5, the valve body 1 and the coil sleeve 13, so that the magnetic field is conveniently concentrated, the energy dissipation of the magnetic field is reduced, the linearity between the useful magnetic field and the current is improved, and the linearity law of the magnetic field is conveniently controlled.

The valve seat 11 is in threaded connection with the plug 10, and a sealing ring 18 is arranged at the left end of the valve seat 11. Through threaded connection, the valve seat 11 is convenient to disassemble, assemble and position adjust, the valve seat 11 is convenient to debug during installation, the sealing ring 18 is used for sealing between the valve seat 11 and the plug 10, and leakage is prevented.

The valve seat 11 is also provided with a locking nut 19. After the position of the valve seat 11 is adjusted, the valve seat 11 is locked by the locking nut 19, so that the valve seat 11 can be effectively prevented from being loosened when being used for a long time, and the size of the opening of the valve is changed.

And a straight pipe 23 is arranged at the left end of the valve body 1. The proportional valve is installed on an output line of the thrust system through a straight pipe 23, can adopt welding or interference fit, and is convenient to install and good in flowability.

The inclination of the conical sealing surface of the valve needle 16 is the same as that of the valve hole 17, and the diameter of the large end of the valve needle 16 is larger than that of the valve hole 17. The sealing effect is improved, the valve opening degree change linearity is good when the valve needle 16 moves at a constant speed, and the pressure fluctuation is reduced.

The reset component 2 is a first spring, and a first spring gasket 21 is arranged between the first spring and the valve body 1. The first spring has high frequency response and high response speed, and is favorable for quick reset of the valve core 4.

A gap is formed between the valve core 4 and the giant magnetostrictive cylinder 6, and a fluid channel is arranged on the supporting cylinder 5 to communicate the gap with the fluid inlet. And a gap is correspondingly arranged between the valve core 4 and the plug 10 to enable the gap to be communicated with the space around the valve needle, and fluid flows in a centralized manner in the fluid channel to reduce resistance.

The valve body 1 and the magnetism isolating ring 7, the magnetism isolating ring 7 and the pole shoe 9, the pole shoe 9 and the plug 10, and the pole shoe 9 and the coil sleeve 13 are welded. The integrity and the sealing performance of the proportional valve are improved, the strength of the joint is ensured, and the use safety is ensured under the condition of high fluid pressure.

The valve body 1, the supporting seat 5, the pole shoe 9, the coil sleeve 13 and the plug 10 are made of magnetic materials; the magnetism isolating ring 7, the valve core 4 and the valve seat 11 are made of non-magnetic materials.

Claims

1. The utility model provides a needle conical surface canned type micro-flow giant magnetostrictive proportional valve which characterized in that: the magnetic valve comprises a valve body (1), a magnetism isolating ring (7) and a pole shoe (9) which are sequentially connected from left to right, wherein a coil assembly (8) is sleeved on the magnetism isolating ring (7), a plug (10) is arranged in the pole shoe (9), a valve seat (11) is arranged in the plug (10), a valve hole (17) is arranged in the valve seat (11) and communicated with an inner cavity of the valve body (1), a fluid inlet is formed in the valve body (1), a valve core (4) is arranged in the valve body (1), a valve needle (16) is arranged at the right end of the valve core (4), a conical sealing surface is correspondingly arranged at one side, close to the valve hole (17), of the valve needle (16), a support cylinder (5) and a giant magnetostrictive cylinder (6) are sleeved on the valve core (4), the axial position of the giant magnetostrictive cylinder (6) is at least partially overlapped with the magnetism isolating ring (7), a shoulder structure (20) is arranged at the, a reset component (2) is arranged between the left end of the shoulder structure and the wall surface of the valve body (1).

2. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 1, characterized in that: and a pressing part (3) is also arranged between the left end surface of the supporting cylinder (5) and the wall surface of the valve body (1).

3. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 2, characterized in that: the pressing part (3) is a second spring, and a second spring gasket (22) is arranged between the second spring and the valve body (1).

4. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 1, characterized in that: the pole shoe (9) is cylindrical with an outward flange, the right end of the coil component (8) is in contact with the outward flange of the pole shoe (9), and the left end of the coil component (8) at least covers one part of the valve body (1).

5. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 4, characterized in that: the coil assembly (8) comprises a coil (12) and a coil sleeve (13), insulating glue (14) is arranged between the coil (12) and the magnetism isolating ring (7), a wiring terminal (15) is arranged on the end face of the coil sleeve (13) in a penetrating mode, and the wiring terminal (15) is connected with the coil (12).

6. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 5, characterized in that: the left end of the coil sleeve (13) is provided with an inner flanging structure, and the inner flanging structure is in contact with the valve body (1).

7. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 1, characterized in that: the valve seat (11) is in threaded connection with the plug (10), and a sealing ring (18) is arranged at the left end of the valve seat (11).

8. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 7, characterized in that: and a locking nut (19) is also arranged on the valve seat (11).

9. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 1, characterized in that: the left end of the valve body (1) is provided with a straight pipe (23).

10. The needle conical surface sealing type micro-flow super-magnetostrictive proportional valve according to claim 1, characterized in that: the taper sealing surface gradient of the valve needle (16) and the valve hole (17) is the same, and the diameter of the large end of the valve needle (16) is larger than that of the valve hole (17).