Executing mechanism driven by shape memory alloy

Abstract

The invention belongs to the technical field of valve executing parts, and discloses an executing mechanism driven by shape memory alloy, which comprises a supporting disc and a guide cylinder, a first binding post, a second binding post and a plurality of groups of positioning columns are arranged on the top surface of the supporting disc, the plurality of groups of positioning columns are spirally distributed, and a memory alloy wire is arranged on the top surface of the supporting disc. One end of a memory alloy wire is connected with the second binding post, the memory alloy wire is in sliding contact with the surface of the positioning column, and finally the memory alloy wire is in contact with the surface of the first binding post and then penetrates through a through hole in the center of the supporting disc to penetrate into a guide cylinder, and a connecting cylinder at the top end of the guide cylinder penetrates into the through hole in the center of the supporting disc; a positioning spring and a sliding block are arranged in the guide cylinder in a penetrating mode, the sliding block is connected with the tail end of the memory alloy wire, and a mandrel is arranged at the bottom end of the sliding block. The memory alloy wire is arranged in a spiral mode and occupies a smaller space, when the memory alloy wire is heated and integrally contracts, the memory alloy wire pulls the sliding block to move, longer linear displacement is achieved, and the executing mechanism is more compact in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve actuators, in particular to an actuator driven by a shape memory alloy. BACKGROUND

[0002] In many key fields such as automobiles, aerospace and industrial production, most of the current actuator devices, such as valves for fluid control on automobiles and aircraft, and widely used mechanical arms in industrial production, are mostly driven by stepping motors or servo motors. However, these actuator devices driven by motors have many limitations, such as heavy weight, high noise level during operation, and high power consumption. Therefore, the actuator based on shape memory alloy as the driving element is gradually attracting widespread attention from technical personnel in the field due to its many significant advantages such as light weight, low noise, and low power consumption. However, the current actuator driven by memory alloy as the driving element has a narrow linear deformation range of the shape memory alloy, and in order to make the actuator output sufficient linear displacement, the memory alloy wire needs to have sufficient length, which leads to an increase in the overall size and weight of the actuator, and cannot well meet the requirements of miniaturization and light weight of the device. SUMMARY

[0003] The present application aims to provide an actuator driven by a shape memory alloy to solve the problem of insufficient miniaturization and compact structure of the current actuator driven by memory alloy.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] An actuator driven by a shape memory alloy, comprising a support disc and a guide cylinder, the top surface of the support disc is provided with a first terminal post, a second terminal post and a plurality of positioning columns, the plurality of positioning columns are distributed in a spiral manner, the top surface of the support disc is provided with a memory alloy wire, one end of the memory alloy wire is connected to the second terminal post, the memory alloy wire is arranged in the same spiral manner as the positioning columns and in sliding contact with the surface of the positioning columns, and the memory alloy wire finally contacts the surface of the first terminal post and then passes through the through hole in the center of the support disc and enters the guide cylinder, the top end of the guide cylinder is provided with a connecting cylinder, the connecting cylinder is arranged in the through hole in the center of the support disc, a positioning spring and a sliding block are respectively arranged in the guide cylinder, the top end of the positioning spring is connected to the sliding block, the end of the memory alloy wire is connected to the sliding block, and the bottom end of the sliding block is provided with a mandrel.

[0006] Further, the first terminal post and the second terminal post are each provided with a protective sleeve, the protective sleeve is made of insulating material, and the first terminal post is not provided with a protective sleeve at the contact position with the memory alloy wire.

[0007] Further, two protective discs are arranged on the support disc, the protective discs are fixed on the plurality of positioning columns, the memory alloy wire is located between the two protective discs, and the protective discs are made of heat insulation material.

[0008] Further, a sliding sleeve is arranged at the top opening of the connecting cylinder, and the surface of the sliding sleeve is smooth and in contact with the surface of the memory alloy wire.

[0009] Further, a positioning block is arranged at the bottom end of the sliding block after penetrating the guiding cylinder, and the outer diameter of the positioning block is the same as the outer diameter of the guiding cylinder.

[0010] The principle and beneficial effects of the technical scheme are as follows:

[0011] The memory alloy wire has a certain elasticity at normal temperature, and is moved downward by a distance under the elastic force of the positioning spring; when the memory alloy wire is heated, the memory alloy wire is contracted due to the shape memory effect; the memory alloy wire is arranged between the positioning columns on the support disc in a spiral manner; compared with the traditional memory alloy driven actuator, the execution mechanism occupies a smaller space, and a longer memory alloy wire is placed to obtain a longer contraction amount; since one end of the memory alloy wire is fixed through the No. 2 connecting post, when the memory alloy wire is contracted as a whole, the memory alloy wire slides along the positioning column, and the other end of the memory alloy wire pulls the sliding block to move into the guiding cylinder, so that a longer linear displacement is realized, and the structure of the execution mechanism is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a structural schematic diagram of the execution mechanism driven by the shape memory alloy according to the present application;

[0013] Figure 2 FIG. 2 is an assembly structural schematic diagram of the execution mechanism driven by the shape memory alloy according to the present application;

[0014] Figure 3 FIG. 3 is a top view of the execution mechanism driven by the shape memory alloy according to the present application;

[0015] Figure 4 FIG. 4 is a structural schematic diagram of the valve based on the present application;

[0016] Figure 5 FIG. 5 is a sectional view of the closed state of the valve based on the present application;

[0017] Figure 6 FIG. 6 is a sectional view of the open state of the valve based on the present application;

[0018] The corresponding labels in the attached diagram are named as follows: 1. Support plate; 2. Connecting cylinder; 3. Guide cylinder; 4. Positioning spring; 5. Sliding block; 6. Positioning block; 7. Mandrel; 8. Positioning post; 9. Memory alloy wire; 10. Sliding sleeve; 11. Terminal 1; 12. Terminal 2; 13. Protective sleeve; 14. Protective plate; 15. Top cover; 16. Sleeve; 17. Connecting seat; 18. Sleeve-shaped shell; 19. Sealing ring; 20. Liquid inlet; 21. Base; 22. Liquid outlet. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0020] like Figures 1-6 As shown, an actuator driven by shape memory alloy includes a support plate 1 and a guide cylinder 3. The top surface of the support plate 1 is provided with a first terminal 11, a second terminal 12, and multiple sets of positioning posts 8, which are arranged in a spiral pattern. A shape memory alloy wire 9 is provided on the top surface of the support plate 1. One end of the shape memory alloy wire 9 is connected to the second terminal 12. The shape memory alloy wire 9 is arranged in the same spiral pattern as the positioning posts 8 and slides in contact with the surface of the positioning posts 8. After the shape memory alloy wire 9 finally contacts the surface of the first terminal 11, it passes through the through hole in the center of the support plate 1 and enters the guide cylinder 3. A connecting cylinder 2 is provided at the top of the guide cylinder 3 and passes through the through hole in the center of the support plate 1. A positioning spring 4 and a sliding block 5 are respectively installed in the guide cylinder 3. The positioning spring 4 is connected to the top of the sliding block 5, and the sliding block 5 is connected to the end of the shape memory alloy wire 9. A spindle 7 is provided at the bottom of the sliding block 5.

[0021] In the example embodiment of the application for the valve, the bottom surface of the support disc 1 is connected with the connecting seat 17, the connecting seat 17 and the support disc 1 are both arranged in the sleeve 16, the top end of the sleeve 16 is provided with the top cover 15, the top end of the first connecting post 11 and the second connecting post 12 is arranged outside the top cover 15, the components above the support disc 1 are protected by the top cover 15, the sleeve 16 and the connecting seat 17, so as to ensure the stable working environment; the bottom surface of the connecting seat 17 is connected with the sleeve-shaped shell 18, the guide cylinder 3 is arranged in the sleeve-shaped shell 18 after passing through the connecting seat 17, the surface of the sleeve-shaped shell 18 is provided with the sealing ring 19 and the liquid inlet hole 20, which is used for sealing and facilitating the working fluid to enter the sleeve-shaped shell 18, and the bottom end of the sleeve-shaped shell 18 is provided with the base 21, the liquid outlet hole 22 is arranged on the base 21, under the elastic force of the positioning spring 4, the sliding block 5 is driven to move outwardly of the guide cylinder 3, so that the memory alloy wire 9 is stretched, the mandrel 7 is located in the liquid outlet hole 22 and is sealed (at this time, the valve is in the closed state); the power is connected through the first connecting post 11 and the second connecting post 12, a certain potential difference is applied to the two, the current is formed in the memory alloy wire 9, the memory alloy wire 9 is contracted after being heated by the current, the whole memory alloy wire 9 slides along the surface of the plurality of positioning columns 8, and one end of the memory alloy wire 9 is fixed by the second connecting post 12, so that when the memory alloy wire 9 is contracted, the other end of the memory alloy wire 9 drives the sliding block 5 to move inwardly of the guide cylinder 3, so that the mandrel 7 is separated from the liquid outlet hole 22 on the base 21, the liquid outlet hole 22 is opened (at this time, the valve is in the open state), the working fluid can enter from the liquid inlet hole 20 and flow out from the liquid outlet hole 22, and the memory alloy wire 9 is arranged in a spiral manner on the positioning column 8 of the support disc 1, the length of the memory alloy wire 9 is longer, the contraction amount of the memory alloy wire 9 is larger, and sufficient linear displacement is provided for the actuator, the temperature of the memory alloy wire 9 can be controlled by controlling the current size in the memory alloy wire 9, so that the contraction amount of the memory alloy wire 9 is controlled, the opening degree of the valve is adjusted, and the size is smaller and the structure is more compact.

[0022] In the example embodiment, the first connecting post 11 and the second connecting post 12 are both provided with the protective sleeve 13, the protective sleeve 13 is made of insulating material, and the first connecting post 11 is not provided with the protective sleeve 13 at the contact position with the memory alloy wire 9. The protective sleeve 13 made of insulating material can play a protective role, avoid the first connecting post 11 and the second connecting post 12 being affected by external factors, and avoid the occurrence of electric leakage.

[0023] In the example embodiment, the support disc 1 is provided with two groups of protective discs 14, the protective discs 14 are fixed on the plurality of positioning columns 8, the memory alloy wire 9 is located between the two groups of protective discs 14, and the protective discs 14 are made of heat insulation material. The protective disc 14 can limit the position of the memory alloy wire 9, avoid the memory alloy wire 9 moving up and down on the surface of the positioning column 8 and the first connecting post 11, and affect the use effect, and the protective disc 14 made of heat insulation material can play a heat insulation role, reduce the influence of external temperature change on the memory alloy wire 9, and improve the stability of the memory alloy wire 9.

[0024] In the embodiment, the sliding sleeve 10 is arranged at the top opening of the connecting cylinder 2, and the surface of the sliding sleeve 10 is smooth and in contact with the surface of the memory alloy wire 9. The surface of the sliding sleeve 10 is smooth, which can avoid the memory alloy wire 9 directly contacting the opening edge of the connecting cylinder 2, reduce the abrasion of the memory alloy wire 9, and prolong the service life of the memory alloy wire 9.

[0025] In the embodiment, the sliding block 5 is provided with the positioning block 6 after penetrating out of the guide cylinder 3, and the outer diameter of the positioning block 6 is the same as that of the guide cylinder 3. The positioning block 6 can slide in the sleeve-shaped shell 18, and plays an auxiliary positioning role for the sliding block 5 and the mandrel 7, improves the matching degree of the mandrel 7, so that the mandrel 7 can better align with the liquid outlet hole 22, enhances the sealing effect, and reduces the risk of leakage.

[0026] The above is only the embodiment of the present application, and the well-known specific technical solutions or characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the technical solutions of the present application, a number of deformations and improvements can be made, which should also be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. An actuator driven by a shape memory alloy, characterized in that: The system includes a support plate (1) and a guide cylinder (3). The top surface of the support plate (1) is provided with a first terminal (11), a second terminal (12), and multiple sets of positioning posts (8). The multiple sets of positioning posts (8) are arranged in a spiral pattern. A shape memory alloy wire (9) is provided on the top surface of the support plate (1). One end of the shape memory alloy wire (9) is connected to the second terminal (12). The shape memory alloy wire (9) is arranged in the same spiral pattern as the positioning posts (8) and slides in contact with the surface of the positioning posts (8). The shape memory alloy wire (9) finally... After the first terminal (11) contacts the surface, it passes through the through hole in the center of the support plate (1) and enters the guide cylinder (3). The top of the guide cylinder (3) is provided with a connecting cylinder (2). The connecting cylinder (2) passes through the through hole in the center of the support plate (1). The guide cylinder (3) is provided with a positioning spring (4) and a sliding block (5). The positioning spring (4) is connected to the top of the sliding block (5). The sliding block (5) is connected to the end of the memory alloy wire (9). The bottom of the sliding block (5) is provided with a spindle (7).

2. The actuator driven by a shape memory alloy according to claim 1, characterized in that: Both the first terminal (11) and the second terminal (12) are provided with protective sleeves (13), which are made of insulating material. The protective sleeves (13) are not provided at the contact point between the first terminal (11) and the shape memory alloy wire (9).

3. The actuator driven by a shape memory alloy according to claim 1, characterized in that: The support plate (1) is provided with two sets of protective plates (14), the protective plates (14) are fixed on multiple sets of positioning columns (8), the memory alloy wire (9) is located between the two sets of protective plates (14), and the protective plates (14) are made of heat-insulating material.

4. The actuator driven by a shape memory alloy according to claim 1, characterized in that: A sliding sleeve (10) is provided at the top opening of the connecting cylinder (2). The surface of the sliding sleeve (10) is smooth and in contact with the surface of the memory alloy wire (9).

5. The actuator driven by a shape memory alloy according to claim 1, characterized in that: The bottom end of the sliding block (5) extends out of the guide cylinder (3) and a positioning block (6) is provided thereon. The outer diameter of the positioning block (6) is the same as the outer diameter of the guide cylinder (3).

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