A flow control device based on giant magnetostrictive actuator

Abstract

The invention discloses a flow control device based on a giant magnetostrictive actuator, comprising: a giant magnetostrictive actuator; a main body connected to the giant magnetostrictive actuator; a first chamber arranged in the main body, the first chamber is provided with a pressure transmission medium, and the output shaft of the giant magnetostrictive actuator extends into the first chamber; a first piston assembly is arranged in the first chamber and connected with the first chamber in a sliding seal, and the output shaft is fixedly connected with the first piston assembly; a second chamber is arranged in the main body and its first end is connected with the first chamber; a third chamber is arranged in the main body and is connected with the second end of the second chamber; a diaphragm is arranged in the third chamber and divides it into a working chamber and a receiving chamber, the receiving chamber is connected with the second chamber, the working chamber is provided with an inlet and an outlet, and the inlet and the outlet are respectively provided with a first check valve and a second check valve; a second piston assembly is arranged in the receiving chamber and its first end is connected with the second chamber in a sliding seal, and the second piston assembly makes its second end collide with the diaphragm through an elastic member. The device has high flow control accuracy, small size and simple structure.

Description

Technical Field

[0001] The invention belongs to the technical field of flow control, and in particular relates to a flow control device based on a giant magnetostrictive driver. Background Art

[0002] Flow control devices are devices used to drive the flow of working fluids and control the flow of working fluids. This year, with the continuous development of technology, the structure of flow control devices is increasingly moving towards energy conservation, emission reduction, intelligent control, and miniaturization. Devices such as hydraulic pumps are crucial components in hydraulic transmission systems. Their performance will directly affect the entire production process. In the entire fluid machinery industry, design and analysis of them is also one of the focuses of work.

[0003] In the field of micro-flow control, traditional control devices have many shortcomings, and due to their large size, complex internal structure, difficult mechanical processing, and low flow control accuracy, they cannot achieve micro-flow transmission. Therefore, all walks of life, especially the military, scientific research, aerospace and other fields, attach great importance to the research of new micro-flow pumps with simple structure, small size, easy processing, and intelligent control of output flow. Especially in the field of new medical equipment, the research and development of micro-flow drug delivery equipment is becoming a hot research direction. Summary of the invention

[0004] To solve the above problems, the object of the present invention is to provide a flow control device based on a giant magnetostrictive actuator, which has high flow control accuracy, small size and simple structure.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A flow control device based on a giant magnetostrictive actuator, comprising:

[0007] Giant magnetostrictive actuator;

[0008] A main body connected to the giant magnetostrictive actuator;

[0009] A first cavity is provided in the main body, wherein a pressure transmission medium is provided in the first cavity, and an output shaft of the giant magnetostrictive actuator extends into the first cavity;

[0010] A first piston assembly is disposed in the first chamber and is connected to the first chamber in a sliding and sealing manner, and the output shaft is fixedly connected to the first piston assembly;

[0011] A second cavity, disposed in the main body and having a first end in communication with the first cavity;

[0012] a third cavity, disposed in the main body and communicating with the second end of the second cavity;

[0013] a diaphragm, disposed in the third chamber and dividing the third chamber into a working chamber and a receiving chamber, wherein the receiving chamber is communicated with the second chamber, the working chamber is provided with an inlet and an outlet, and the inlet and the outlet are provided with a first one-way valve and a second one-way valve respectively;

[0014] A second piston assembly is disposed in the accommodating chamber and has a first end slidably and sealingly connected to the second chamber, wherein the second end of the second piston assembly is in contact with the diaphragm through an elastic member;

[0015] During operation, the output shaft reciprocates and expands, driving the first piston assembly to slide reciprocatingly to repeatedly compress the pressure-transmitting medium. The pressure transmitted by the pressure-transmitting medium drives the second piston assembly to slide reciprocatingly to drive the diaphragm to vibrate. The vibration of the diaphragm causes the volume of the working chamber to repeatedly increase and decrease. When the volume of the working chamber increases, the first one-way valve opens and the second one-way valve closes, and the working medium is sucked into the working chamber from the inlet. When the volume of the working chamber decreases, the first one-way valve closes and the second one-way valve opens, and the working medium is discharged from the outlet.

[0016] According to an embodiment of the present invention, the elastic member is disposed in the accommodating chamber, the second piston assembly is provided with a flange, the accommodating chamber is provided with a fixing portion, and two ends of the elastic member are respectively connected to the flange and the fixing portion.

[0017] According to an embodiment of the present invention, the fixing portion is a fastening disc threadedly connected to the inner wall of the accommodating chamber, and the second end of the second piston assembly is penetrated through the fastening disc.

[0018] According to an embodiment of the present invention, the cross-sectional area of ​​the second cavity is smaller than that of the first cavity.

[0019] According to an embodiment of the present invention, a cross-sectional area of ​​the first cavity at one end close to the second cavity gradually decreases toward the second cavity.

[0020] According to an embodiment of the present invention, the second cavity is a through hole.

[0021] According to one embodiment of the present invention, the giant magnetostrictive actuator includes a housing, a first end cover and a disc spring, the first end cover is threadedly connected to the housing, the output shaft passes through and extends out of the first end cover, the disc spring is arranged between the first end cover and the output shaft, and the main body is fixedly connected to the first end cover.

[0022] According to an embodiment of the present invention, the first one-way valve and the second one-way valve are both disc-shaped valve discs, the inlet and the outlet are both fixedly provided with fastening rings, and the valve shoulder of the disc-shaped valve disc is fixedly connected to one end surface of the fastening ring.

[0023] According to an embodiment of the present invention, the pressure transmission medium is hydraulic oil.

[0024] According to an embodiment of the present invention, the first chamber is provided with an oil filling port.

[0025] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0026] (1) In the embodiment of the present invention, a giant magnetostrictive actuator is used as a driving source, and the micro displacement of the output shaft of the giant magnetostrictive actuator is amplified by the first piston assembly and the second piston assembly to cause the vibration of the diaphragm, thereby realizing the flow of the working fluid and the control of the working fluid flow rate, so that the controllable performance is higher, the control accuracy of the micro flow rate is higher, and the volume is small and the structure is simple.

[0027] (2) In the embodiment of the present invention, the fixing portion is a fastening disc threadedly connected to the inner wall of the accommodating chamber. The second end of the second piston assembly can be abutted against the diaphragm by rotating the fastening disc, making installation and disassembly more convenient.

[0028] (3) In the embodiment of the present invention, the cross-sectional area of ​​the second chamber is smaller than that of the first chamber, so that the second piston assembly can amplify the displacement of the first piston assembly through the pressure transmission medium to achieve micro-displacement of the amplified output shaft.

[0029] (4) In the embodiment of the present invention, the cross-sectional area of ​​the first cavity near one end of the second cavity gradually decreases toward the second cavity to reduce the pressure loss of the pressure transmission medium, thereby achieving higher flow control accuracy.

[0030] (5) In the embodiment of the present invention, the main body is fixedly connected to the first end cover of the giant magnetostrictive actuator, so that the disc spring and the output rod are compressed by rotating the first end cover to form a pre-pressure, thereby forming a pre-pressure mechanism of the giant magnetostrictive actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 It is an overall cross-sectional view of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0033] Figure 2 A partial cross section of a flow control device based on a giant magnetostrictive actuator of the present invention Figure 1 ;

[0034] Figure 3 A partial cross section of a flow control device based on a giant magnetostrictive actuator of the present invention Figure 2 ;

[0035] Figure 4 This is an overall appearance diagram of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0036] Figure 5 An exploded view of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0037] Figure 6 It is a schematic diagram of working medium intake of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0038] Figure 7 It is a schematic diagram of working medium discharge of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0039] Figure 8 A schematic diagram of a disc-shaped valve plate of a flow control device based on a giant magnetostrictive actuator of the present invention;

[0040] Fig. 9 The figure is a schematic diagram of a fastening ring of a flow control device based on a giant magnetostrictive actuator of the present invention.

[0041] Description of reference numerals:

[0042] 1: giant magnetostrictive actuator; 2: output shaft; 3: first chamber; 4: first piston assembly; 5: second chamber; 6: diaphragm; 7: working chamber; 8: accommodating chamber; 9: inlet; 10: outlet; 11: first one-way valve; 12: second one-way valve; 13: flange; 14: fastening disc; 15: housing; 16: first end cover; 17: disc spring; 18: disc valve plate; 19: fastening ring; 20: valve shoulder; 21: flow channel; 22: oil filling port; 23: driving coil; 24: coil Skeleton; 25: phase change material; 26: sliding bearing; 27: sleeve; 28: giant magnetostrictive material; 29: circular permanent magnet; 30: base; 31: outlet hole; 32: first shell; 33: second shell; 34: third shell; 35: second end cover; 36: second piston assembly; 37: piston rod; 38: guide ring; 39: spring; 40: push rod; 41: sliding sealing ring; 42: elastic gasket; 43: inlet conduit; 44: outlet conduit; 45: sealing ring. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] See also Figures 1 to 9 The core of the present invention is to provide a flow control device based on a giant magnetostrictive actuator 1, including a giant magnetostrictive actuator 1, a main body, a first chamber 3, a first piston assembly 4, a second chamber 5, a third chamber, a diaphragm 6, and a second piston assembly 36. The main body is connected to the giant magnetostrictive driver 1; the first chamber 3 is provided in the main body, the first chamber 3 is provided with a pressure transmission medium, and the output shaft 2 of the giant magnetostrictive driver 1 extends into the first chamber 3; the first piston assembly 4 is provided in the first chamber 3 and is connected to the first chamber 3 in a sliding and sealing manner, and the output shaft 2 is fixedly connected to the first piston assembly 4; the second chamber 5 is provided in the main body and its first end is communicated with the first chamber 3; the third chamber is provided in the main body and is communicated with the second end of the second chamber 5; the diaphragm 6 is provided in the third chamber and divides it into a working chamber 7 and a receiving chamber 8, the receiving chamber 8 is communicated with the second chamber 5, the working chamber 7 is provided with an inlet 9 and an outlet 10, and the inlet 9 and the outlet 10 are respectively provided with a first check valve 11 and a second check valve 12; the second piston assembly 36 is provided in the receiving chamber 8 and its first end is connected to the second chamber 5 in a sliding and sealing manner, and the second piston assembly 36 is caused to contact the diaphragm 6 through an elastic member.

[0046] During operation, the output shaft 2 of the giant magnetostrictive actuator 1 reciprocates and retracts, driving the first piston assembly 4 to slide reciprocatingly in the first chamber 3 to repeatedly compress the pressure-transmitting medium. The pressure of the pressure-transmitting medium increases, driving the second piston assembly 36 to slide reciprocatingly in the second chamber 5. The second end of the second piston assembly 36 repeatedly lifts the diaphragm 6 to drive the diaphragm 6 to vibrate. The vibration of the diaphragm 6 causes the volume of the working chamber 7 to repeatedly increase and decrease. When the volume of the working chamber 7 increases, the first one-way valve 11 opens and the second one-way valve 12 closes, and the working medium is sucked into the working chamber 7 from the inlet 9. When the volume of the working chamber 7 decreases, the first one-way valve 11 closes and the second one-way valve 12 opens, and the working medium is discharged from the outlet 10.

[0047] By using the giant magnetostrictive actuator 1 as a driving source, and amplifying the micro-displacement of the output shaft 2 of the giant magnetostrictive actuator 1 through the first piston assembly 4 and the second piston assembly 36 to cause the vibration of the diaphragm 6, the flow of the working fluid and the control of the working fluid flow rate are achieved, so that the controllable performance is higher, the control accuracy of the micro-flow is higher, the volume is small, and the structure is simple.

[0048] The flow control device based on giant magnetostrictive actuator of the present invention is described in detail below:

[0049] The giant magnetostrictive actuator 1 is a linear actuator made of a giant magnetostrictive material 28. The giant magnetostrictive material 28 is based on the Joule effect and is an alloy composed of rare earth metals terbium (Tb), dysprosium (Dy) and metal iron (Fe). It is a transducer material, an actuating material, a sensing material, and also an intelligent material, which is widely used in the fields of industry and medical equipment. When the magnetic field acts, the material itself will undergo lattice deformation, that is, the rod will stretch or shorten along the direction of magnetization. When the external magnetic field disappears, it will return to its original shape. This phenomenon is called linear magnetostriction. Because the giant magnetostrictive material 28 has the characteristics of large driving force (for a rod with a diameter of 50mm, it can generate a driving force of more than 60kN), fast response speed (microsecond level), high precision (10-1~10-3 microns), and excellent reliability (no fatigue and aging), it is widely used in transducers, brakes, micro-element control and other fields. It has broad research and application prospects in aerospace, precision instruments, military, sonar, medical and other fields, and has gradually become a hot research direction in recent years.

[0050] For details, see Figure 1 The giant magnetostrictive actuator 1 comprises a housing 15, a first end cover 16 and a disc spring 17, a driving coil 23, a coil frame 24, a phase change material 25, an output shaft 2, a sliding bearing 26, a sleeve 27, a giant magnetostrictive material 28, a circular permanent magnet 29, and a base 30. The first end cover 16 is threadedly connected to the housing 15, the output shaft 2 is passed through and extends out of the first end cover 16, and a sliding bearing 26 is provided between the output shaft 2 and the first end cover 16, so that the output shaft 2 can slide relative to the first end cover 16. The disc spring 17 is provided between the first end cover 16 and the output shaft 2.

[0051] When the giant magnetostrictive actuator 1 is working, it is necessary to provide pre-pressure to the giant magnetostrictive material 28, so the first end cover 16 is connected to the housing 15 through a threaded structure, and the disc spring 17 is compressed by rotating the first end cover 16 to form a pre-pressure on the output shaft 2. The driving coil 23 is wound on the coil frame 24, and is pulled out from the outlet hole 31 and connected to the external power supply device to power the giant magnetostrictive actuator 1. The giant magnetostrictive material 28 is placed in the sleeve 27, and a circular permanent magnet 29 of a corresponding diameter is placed under the material to eliminate the frequency doubling effect. The phase change material 25 is placed between the coil frame 24 and the sleeve 27 to absorb the heat generated during the operation of the giant magnetostrictive actuator 1 and ensure the stability of the operation.

[0052] When current is passed through the driving coil 23 to generate a magnetic field, the length of the giant magnetostrictive material 28 changes, causing the output shaft 2 to produce a small reciprocating linear motion. By changing the current, the expansion and contraction of the giant magnetostrictive material 28 can be adjusted to adjust the reciprocating linear motion stroke of the output shaft 2.

[0053] In this embodiment, the main body is fixedly connected to the first end cover 16. Specifically, the main body includes a first shell 32, a second shell 33, a third shell 34, and a second end cover 35.

[0054] The lower end of the first housing 32 is open, and a flange is provided at one end of the opening. The first housing 32 is mounted on the first end cover 16 by means of the flange and bolts. The first housing 32 is provided with a first cavity 3, and a portion of a second cavity 5 is provided at the upper portion of the first housing 32. The first piston assembly 4 is disposed in the first cavity 3, and is slidably and sealably connected to the inner wall of the first cavity 3 by means of a sliding sealing ring 41. The lower end of the first piston assembly 4 is threadedly connected to the output shaft 2, and the threaded connection facilitates installation and disassembly. The first cavity 3 at the upper portion of the first piston assembly 4 is filled with a pressure transmission medium, and in this embodiment, the pressure transmission medium is hydraulic oil. The first cavity 3 is also provided with an oil filling port 22 connected to the outside, for injecting hydraulic oil into the first cavity 3.

[0055] The lower end of the second housing 33 is fixedly connected to the upper end of the first housing 32 by a flange and bolts, and the second housing 33 and the first housing 32 are sealed by a sealing ring 45. A portion of the second chamber 5 is provided at the lower part of the second housing 33, which together with the portion of the second chamber 5 at the upper part of the first housing 32 constitutes a complete second chamber 5. The cross-sectional area of ​​the second chamber 5 is smaller than that of the first chamber 3, so that the second piston assembly 36 can amplify the displacement of the first piston assembly 4 through hydraulic oil to achieve a micro-displacement of the amplified output shaft 2. In this embodiment, the amplification ratio is 10:1. In this embodiment, the second chamber 5 is a through hole. A receiving chamber 8 is provided at the upper part of the second housing 33, and the upper end of the second housing 33 is open.

[0056] The lower end of the third housing 34 is connected to the upper end of the second housing 33 by bolts, and a diaphragm 6 is connected between the third housing 34 and the second housing 33 by the bolts. The material of the diaphragm 6 is beryllium bronze, which can flexibly move up and down. A sealing ring 45 is also provided between the third housing 34 and the second housing 33 for sealing. The third housing 34 is provided with a working chamber 7, and the working chamber 7 and the accommodating chamber 8 are separated by the diaphragm 6, and the working chamber 7 and the accommodating chamber 8 form a third chamber.

[0057] The lower end of the second piston assembly 36 is a piston rod 37, which is slidingly and sealingly connected to the second chamber 5 via a sliding sealing ring 41, and a guide ring 38 is also provided at the upper end of the second chamber 5. The piston rod 37 is inserted into the guide ring 38, and the guide ring 38 is used to guide the piston rod 37 to prevent its radial deviation, which would lead to poor control accuracy.

[0058] The elastic member is arranged in the accommodating chamber 8. In this embodiment, the elastic member is a spring 39. A flange 13 is arranged in the middle of the second piston assembly 36. The accommodating chamber 8 is provided with a fixing portion. Both ends of the spring 39 are fixedly connected to the flange 13 and the fixing portion respectively.

[0059] In this embodiment, the fixing part is a fastening disc 14 threadedly connected to the inner wall of the accommodating chamber 8, and the fastening disc 14 is arranged above the flange 13 and below the diaphragm 6. A spring 39 is fixedly connected to both sides of the fastening disc 14, and the other end of the spring 39 is fixedly connected to the flange 13. The second end of the second piston assembly 36 is a push rod 40, which is inserted into the fastening disc 14. The spring 39 applies elastic force to the second piston assembly 36 so that the push rod 40 contacts the diaphragm 6. And preferably, a guide ring 38 is also provided between the fastening disc 14 and the push rod 40, which is used to guide the push rod 40 to prevent its radial deviation, resulting in poor control accuracy. The push rod 40 contacts the diaphragm 6 through the spring 39 and the initial pressure of the hydraulic oil, so that the two are in close contact, avoiding the whole device from malfunctioning due to the gap. And by rotating the fastening disc 14, the second end of the second piston assembly 36 can be made to contact the diaphragm 6, making it more convenient to install and disassemble.

[0060] An elastic gasket 42 is also provided between the upper end surface of the diaphragm 6 and the inner wall of the upper end of the third housing 34 to prevent the diaphragm 6 from being damaged by excessive output force.

[0061] The upper end of the third housing 34 is also provided with an inlet 9 and an outlet 10 connected to the external working chamber 7. In this embodiment, the upper end of the third housing 34 is also threadedly connected to a second end cover 35, and an inlet conduit 43 and an outlet conduit 44 are penetrated through the second end cover 35, the inlet conduit 43 and the outlet conduit 44 are connected to the inlet 9 and the outlet 10 respectively, and a first one-way valve 11 is provided between the inlet conduit 43 and the inlet 9, and a second one-way valve 12 is provided between the outlet conduit 44 and the outlet 10.

[0062] In this embodiment, the first one-way valve 11 and the second one-way valve 12 are both disc-shaped valve plates 18 made of beryllium bronze. Figure 6 , Figure 7A fastening ring 19 is welded to the inlet 9 and the outlet 10, and the valve shoulder 20 of the disc-shaped valve disc 18 is fixedly connected to one end face of the fastening ring 19, that is, the fastening ring 19 presses the non-working valve shoulder 20 of the disc-shaped valve disc 18, and the central working area of ​​the disc-shaped valve disc 18 is slightly larger than the diameter of the inlet 9 and the outlet 10. The disc-shaped valve plate 18 at the inlet 9 is arranged above the fastening disc 14, and the disc-shaped valve plate 18 at the outlet 10 is arranged below the fastening disc 14, so that when the volume of the working chamber 7 increases, the working fluid pressure causes the disc-shaped valve plate 18 of the inlet 9 to deform, so that the flow channel 21 of the disc-shaped valve plate 18 is opened, so that the inlet 9 is opened, and the working medium is sucked into the working chamber 7, while at this time, the disc-shaped valve plate 18 at the outlet 10 is pressed on the fastening disc 14 under the action of pressure without deformation, and the outlet 10 is closed; when the volume of the working chamber 7 decreases, the working medium is squeezed to generate pressure, so that the disc-shaped valve plate 18 at the outlet 10 is deformed, so that the flow channel 21 is opened, so that the outlet 10 is opened, and the working medium flows out from the outlet 10, while at this time, the disc-shaped valve plate 18 at the inlet 9 is pressed on the fastening disc 14 under the action of pressure without deformation, and the inlet 9 is closed, so that the working medium enters and exits to form a one-way flow.

[0063] Preferably, the cross-sectional area of ​​the first chamber 3 at one end close to the second chamber 5 gradually decreases toward the second chamber 5, that is, the first chamber 3 gradually transitions to the second chamber 5 in a gradient, making the cross-sectional area change more stable, thereby reducing the pressure loss of the hydraulic oil and making the flow control more accurate.

[0064] The working process of the present invention is further described below:

[0065] First, the giant magnetostrictive driver 1 is energized, and the length of the giant magnetostrictive material 28 changes to make the output shaft 2 form a linear reciprocating motion, and the output shaft 2 drives the first piston assembly 4 to reciprocate up and down. The first piston assembly 4 repeatedly compresses the hydraulic oil, and the hydraulic oil drives the second piston assembly 36 to reciprocate up and down, and the second piston assembly 36 continuously lifts the diaphragm 6 to make it vibrate.

[0066] When the diaphragm 6 moves downward, the volume of the working chamber 7 increases, the first one-way valve 11 opens to open the inlet 9, the second one-way valve 12 closes to close the outlet 10, and the working medium is sucked into the working chamber 7 from the inlet 9; when the diaphragm 6 moves upward, the volume of the working chamber 7 decreases, the first one-way valve 11 closes to close the inlet 9, the second one-way valve 12 opens to open the outlet 10, and the working medium is discharged from the working chamber 7 from the outlet 10; this is repeated to achieve the function of driving the working medium to flow.

[0067] The expansion and contraction amount of the giant magnetostrictive material 28 is controlled by controlling the current of the giant magnetostrictive driver 1, thereby controlling the reciprocating stroke of the output shaft 2, the first piston assembly 4, and the second piston assembly 36, and further controlling the vibration amplitude of the diaphragm 6, so as to achieve the function of adjusting the flow rate of the working fluid.

[0068] The hydraulic amplification structure of the present invention utilizes Pascal's law to linearly amplify the tiny displacement of the giant magnetostrictive actuator 1, and uses the giant magnetostrictive material 28 in the giant magnetostrictive actuator 1 as the driving material. Compared with traditional hydraulics and pneumatics, it has higher controllability and higher precision in the field of micro-flow control, and is small in size and simple in structure.

[0069] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A flow control device based on a giant magnetostrictive actuator, characterized in that: include: Giant magnetostrictive actuator; A main body connected to the giant magnetostrictive actuator; A first cavity is provided in the main body, wherein a pressure transmission medium is provided in the first cavity, and an output shaft of the giant magnetostrictive actuator extends into the first cavity; A first piston assembly is disposed in the first chamber and is connected to the first chamber in a sliding and sealing manner, and the output shaft is fixedly connected to the first piston assembly; A second cavity, disposed in the main body and having a first end in communication with the first cavity; The cross-sectional area of ​​the second cavity is smaller than that of the first cavity; a third cavity, disposed in the main body and communicating with the second end of the second cavity; a diaphragm, disposed in the third chamber and dividing the third chamber into a working chamber and a receiving chamber, wherein the receiving chamber is communicated with the second chamber, the working chamber is provided with an inlet and an outlet, and the inlet and the outlet are provided with a first one-way valve and a second one-way valve respectively; The first one-way valve and the second one-way valve are both disc-shaped valve discs, the inlet and the outlet are both fixedly provided with a fastening ring, and the valve shoulder of the disc-shaped valve disc is fixedly connected to one end surface of the fastening ring; A second piston assembly is disposed in the accommodating chamber and has a first end slidably and sealingly connected to the second chamber, wherein the second end of the second piston assembly is in contact with the diaphragm through an elastic member; During operation, the output shaft reciprocates and expands, driving the first piston assembly to slide reciprocatingly to repeatedly compress the pressure-transmitting medium. The pressure transmitted by the pressure-transmitting medium drives the second piston assembly to slide reciprocatingly to drive the diaphragm to vibrate. The vibration of the diaphragm causes the volume of the working chamber to repeatedly increase and decrease. When the volume of the working chamber increases, the first one-way valve opens and the second one-way valve closes, and the working medium is sucked into the working chamber from the inlet. When the volume of the working chamber decreases, the first one-way valve closes and the second one-way valve opens, and the working medium is discharged from the outlet.

2. The flow control device based on giant magnetostrictive actuator according to claim 1, characterized in that: The elastic member is arranged in the accommodating chamber, the second piston assembly is provided with a flange, the accommodating chamber is provided with a fixing portion, and two ends of the elastic member are respectively connected to the flange and the fixing portion.

3. The flow control device based on giant magnetostrictive actuator according to claim 2, characterized in that: The fixing portion is a fastening disc threadedly connected to the inner wall of the accommodating cavity, and the second end of the second piston assembly is penetrated by the fastening disc.

4. The flow control device based on giant magnetostrictive actuator according to claim 1, characterized in that: The cross-sectional area of ​​one end of the first cavity close to the second cavity gradually decreases toward the second cavity.

5. The flow control device based on giant magnetostrictive actuator according to claim 1, characterized in that: The second cavity is a through hole.

6. The flow control device based on giant magnetostrictive actuator according to claim 1, characterized in that: The giant magnetostrictive actuator includes a housing, a first end cover and a disc spring, wherein the first end cover is threadedly connected to the housing, the output shaft passes through and extends out of the first end cover, the disc spring is arranged between the first end cover and the output shaft, and the main body is fixedly connected to the first end cover.

7. The flow control device based on giant magnetostrictive actuator according to claim 1, characterized in that: The pressure transmission medium is hydraulic oil.

8. The flow control device based on giant magnetostrictive actuator according to claim 7, characterized in that: The first chamber is provided with an oil filling port.

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