Execution device based on shape memory alloy

Abstract

The invention belongs to the technical field of valve executing parts, and discloses an executing device based on shape memory alloy, which comprises a sleeve-shaped shell and a sliding block, the sliding block is arranged in the sleeve-shaped shell in a sliding manner, two groups of binding posts are oppositely arranged on the sliding block, and the bottom ends of the two groups of binding posts are respectively connected with two ends of a main memory alloy wire; the lower portion of the main memory alloy wire is connected with the moving part, a main positioning spring is arranged between the moving part and the sliding block, a sealing plug is arranged on the bottom face of the moving part and penetrates through a liquid drainage through hole in the base, two sets of auxiliary memory alloy wires are oppositely arranged on the base, and the top ends of the two sets of auxiliary memory alloy wires are connected with the sliding block. An auxiliary positioning spring is arranged between the sliding block and the base; when the temperature changes, the main memory alloy wire contracts to drive the moving part to move, and the auxiliary memory alloy wire also contracts to pull the sliding block to move downwards by the same distance, so that the position of the moving part is kept unchanged, and the actuator can resist the temperature influence and is more stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of valve actuators, and in particular to an actuator based on shape memory alloy. Background Art

[0002] In key areas such as automotive, aerospace, and industrial production, most actuators currently rely on stepper motors or servo motors for driving, such as valves used for fluid control in automobiles and aircraft, and robotic arms widely used in industrial production. However, these motor-driven actuators have many limitations, such as heavy weight, high noise levels during operation, and high power consumption. With the increasing demand for energy conservation, miniaturization, and lightweighting in equipment such as automobiles, aircraft, and industrial robots, and the increasing pursuit of quality of life, traditional motor-driven actuators have gradually become unable to meet the increasingly stringent application requirements.

[0003] Against this backdrop, actuators using shape memory alloys as driving elements are gaining widespread attention from those in the field due to their numerous significant advantages, including light weight, simple and compact structure, low noise, and low power consumption. However, existing actuators based on shape memory alloys have the following drawbacks: shape memory alloys are sensitive to temperature fluctuations. When the temperature of the environment or working fluid changes, their shape or size also changes, causing the actuator based on shape memory alloys to deviate from the expected operating state. Without external intervention, the performance of the device or equipment will deteriorate, and in severe cases, it may even lead to device or equipment failure, resulting in economic losses.

[0004] To this end, the present invention provides an actuator based on shape memory alloy, which has a certain ability to resist changes in ambient temperature and has stable and reliable working performance, thereby effectively solving the above problems. Summary of the Invention

[0005] The present invention aims to provide an actuator based on shape memory alloy to solve the problem that the actuator at the current stage cannot resist the change of ambient temperature and the working performance is not stable enough.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The invention relates to an actuator based on shape memory alloy, comprising a sleeve-shaped shell and a sliding block. The sleeve-shaped shell has multiple groups of liquid inlet holes circumferentially provided. The sliding block is slidably arranged in the sleeve-shaped shell. Two groups of terminal posts are relatively arranged on the sliding block. The top ends of the terminal posts pass through the through holes on the top block and are located outside the top block. The top block is arranged at the top end of the sleeve-shaped shell. The bottom ends of the two groups of terminal posts are respectively connected to the two ends of the main memory alloy wire. The lower part of the main memory alloy wire is connected to the moving part. A main positioning spring is arranged between the moving part and the sliding block. A sealing plug is provided on the bottom surface of the moving part. The sealing plug is passed through the drainage through hole. The drainage through hole is provided on the base. The base is arranged at the bottom end of the sleeve-shaped shell. Two groups of auxiliary memory alloy wires are relatively arranged on the base. The top ends of the two groups of auxiliary memory alloy wires are connected to the sliding block. An auxiliary positioning spring is arranged between the sliding block and the base.

[0008] Furthermore, a vertical slot is provided on the moving part, the lower part of the main memory alloy wire is located in the vertical slot, and is wrapped around a latch to form a U shape, and the latch is passed through the moving part.

[0009] Furthermore, a positioning column is provided on the bottom surface of the sliding block, and the bottom end of the positioning column is passed through the positioning cylinder, and the positioning cylinder is provided on the moving part.

[0010] Furthermore, the sealing plug is conical.

[0011] Furthermore, the sliding block is made of insulating material.

[0012] The principle and beneficial effects of the technical solution are:

[0013] The present invention provides an actuator based on shape memory alloy. Under given working conditions, a sealing plug on a moving part seals a drainage through-hole through a main positioning spring. During operation, when a current of a specific magnitude is connected to a terminal, the main memory alloy wire contracts, driving the moving part to move, thereby quickly separating the sealing plug from the drainage through-hole and achieving rapid response. When the ambient temperature or the temperature of the working fluid changes, the main memory alloy wire and the auxiliary memory alloy wire are in the same environment and feel the same temperature change. When the main memory alloy wire contracts under the influence of temperature, driving the moving part to move a certain distance, in order to separate the sealing plug from the drainage through-hole, the auxiliary memory alloy wire is also affected by temperature and contracts, pulling the sliding block downward by the same distance, thereby offsetting the influence of the contraction of the main memory alloy wire, keeping the position of the moving part unchanged, and the sealing plug is always located in the drainage through-hole, sealing it, avoiding liquid leakage, and making the actuator more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the actuator based on shape memory alloy of the present invention;

[0015] Figure 2This is a schematic diagram of the assembly structure of the shape memory alloy-based actuator of the present invention;

[0016] Figure 3 A cross-sectional view of a first preset state of an actuator based on a shape memory alloy according to the present invention;

[0017] Figure 4 A cross-sectional view of a second preset state of the shape memory alloy actuator of the present invention;

[0018] The names of the corresponding marks in the accompanying drawings are: 1. Sleeve-shaped shell; 2. Top block; 3. Base; 4. Terminal; 5. Liquid inlet hole; 6. Sliding block; 7. Auxiliary positioning spring; 8. Sealing plug; 9. Pin; 10. Moving part; 11. Main memory alloy wire; 12. Positioning cylinder; 13. Main positioning spring; 14. Auxiliary memory alloy wire; 15. Positioning column; 16. Liquid drainage hole. DETAILED DESCRIPTION

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

[0020] like Figures 1-4 As shown, an actuator based on shape memory alloy includes a sleeve-shaped shell 1 and a sliding block 6. The sleeve-shaped shell 1 has multiple groups of liquid inlet holes 5 circumferentially opened. The sliding block 6 is slidably arranged in the sleeve-shaped shell 1. The sliding block 6 can slide in the sleeve-shaped shell 1 and can prevent liquid leakage. Two groups of terminals 4 are relatively arranged on the sliding block 6. The top ends of the terminals 4 pass through the through holes on the top block 2 and are located outside the top block 2. There is also a sliding seal between the terminals 4 and the through holes. The top block 2 is set at the top of the sleeve-shaped shell 1. The bottom ends of the two groups of terminals 4 are respectively connected to the two ends of the main memory alloy wire 11. The lower part of the main memory alloy wire 11 is connected to the moving part 10. A main positioning spring 13 is provided between the moving part 10 and the sliding block 6, a sealing plug 8 is provided on the bottom surface of the moving part 10, the sealing plug 8 is passed through the drainage hole 16, and the drainage hole 16 is opened on the base 3. The base 3 is provided at the bottom end of the sleeve-shaped shell 1, and two groups of auxiliary memory alloy wires 14 are relatively provided on the base 3. The two groups of auxiliary memory alloy wires 14 have the same expansion and contraction amount as the two ends of the main memory alloy wire 11. The top of the two groups of auxiliary memory alloy wires 14 are connected to the sliding block 6, and an auxiliary positioning spring 7 is provided between the sliding block 6 and the base 3. The position of the sliding block 6 is maintained by the auxiliary positioning spring 7 and the two groups of auxiliary memory alloy wires 14.

[0021] When the actuator is not working, under the action of the main positioning spring 13, the preset state of the moving part 10 is so that the drainage hole 16 is in a closed state (first preset state), that is, the sealing plug 8 below the moving part 10 contacts the drainage hole 16 on the base 3 and forms a sealed state; when the working fluid enters the sleeve-shaped shell 1 through the liquid inlet hole 5, a certain potential difference is applied to the two groups of terminals 4, and a certain current is passed through the main memory alloy wire 11, so that current passes through the inside of the main memory alloy wire 11, causing it to shrink due to heat. At this time, the sliding block 6 maintains its position unchanged under the action of the auxiliary positioning spring 7, so that the main memory alloy wire 11 shrinks and pulls the moving part 10 upward, thereby separating the sealing plug 8 from the base 3, thereby opening the drainage hole 16, so that the moving part 10 is in a new position in the sleeve-shaped shell 1 (second preset state). At this time, the working fluid enters the sleeve-shaped shell 1 from the liquid inlet hole 5 and is discharged from the drainage hole 16 on the base 3. , completing the set action; when the ambient temperature or the temperature of the working fluid changes, the main memory alloy wire 11 and the auxiliary memory alloy wire 14 are affected by the temperature and change, and both ends of the main memory alloy wire 11 will expand and contract, and the expansion amount of its single end is the same as the overall expansion amount of the auxiliary memory alloy wire 14, so that when the main memory alloy wire 11 changes and pulls the moving part 10 to move upward a certain distance, the auxiliary memory alloy wire 14 changes at the same time, pulling the sliding block 6 to squeeze the auxiliary positioning spring 7, and move downward the same distance in the sleeve-shaped shell 1, and the main positioning spring 13 pushes the moving part 10 to move downward the same distance. The main memory alloy wire 11 and the auxiliary memory alloy wire 14 change at the same time, thereby offsetting the trend of the moving part 10 driving the sealing plug 8 to move upward, so that the sealing plug 8 always cooperates with the drainage through hole 16 on the base 3, thereby sealing the actuator, so that the actuator can resist the influence of temperature changes and improve its working stability and reliability.

[0022] In this embodiment, a vertical slot is defined in the moving part 10. The lower portion of the main memory alloy wire 11 is positioned within the slot, wrapping around a latch 9 to form a U-shape. The latch 9 is then inserted into the moving part 10. The main memory alloy wire 11 is inserted into the slot in a U-shape, and the latch 9 is inserted into the bottom of the U-shape of the main memory alloy wire 11, quickly securing it to the moving part 10. This ensures the continuity of the main memory alloy wire 11, allowing it to deform more effectively and quickly upon powering on.

[0023] In this embodiment, a positioning post 15 is provided on the bottom surface of the sliding block 6. The bottom end of the positioning post 15 is inserted into a positioning cylinder 12, which is provided on the moving member 10. The positioning post 15 and the positioning cylinder 12 define the position of the moving member 10, preventing it from shifting, which could cause a poor fit between the sealing plug 8 and the drainage hole 16 and lead to fluid leakage.

[0024] In this embodiment, the sealing plug 8 is conical, and the conical sealing plug 8 can better seal the drainage hole 16 to prevent leakage.

[0025] In this embodiment, the sliding block 6 is made of insulating material. The insulating sliding block 6 can ensure the power supply safety of the main memory alloy wire 11 and prevent the auxiliary memory alloy wire 14 from being affected, so that it is only affected by temperature and changes.

[0026] The above is only an embodiment of the present invention, and common knowledge such as the specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. An actuator based on a shape memory alloy, characterized in that: The invention comprises a sleeve-shaped shell (1) and a sliding block (6), wherein the sleeve-shaped shell (1) is provided with a plurality of groups of liquid inlet holes (5) in a circumferential direction, the sliding block (6) is slidingly arranged in the sleeve-shaped shell (1), and two groups of terminal posts (4) are arranged on the sliding block (6) in a relative manner, wherein the top ends of the terminal posts (4) pass through the through holes on the top block (2) and are located outside the top block (2), and the top block (2) is arranged at the top end of the sleeve-shaped shell (1), and the bottom ends of the two groups of terminal posts (4) are respectively connected to the two ends of the main memory alloy wire (11), and the lower part of the main memory alloy wire (11) is connected to the moving part (10). A main positioning spring (13) is provided between the moving part (10) and the sliding block (6); a sealing plug (8) is provided on the bottom surface of the moving part (10); the sealing plug (8) is inserted into a drainage hole (16); the drainage hole (16) is provided on a base (3); the base (3) is provided at the bottom end of the sleeve-shaped shell (1); two groups of auxiliary memory alloy wires (14) are relatively provided on the base (3); the top ends of the two groups of auxiliary memory alloy wires (14) are connected to the sliding block (6); an auxiliary positioning spring (7) is provided between the sliding block (6) and the base (3).

2. The shape memory alloy-based actuator according to claim 1, characterized in that: The moving part (10) is provided with a vertical slot, the lower portion of the main memory alloy wire (11) is located in the vertical slot, and is wrapped around a latch (9) to form a U shape, and the latch (9) is inserted into the moving part (10).

3. The shape memory alloy actuator according to claim 1, characterized in that: A positioning column (15) is provided on the bottom surface of the sliding block (6), and the bottom end of the positioning column (15) is inserted into a positioning cylinder (12), and the positioning cylinder (12) is provided on the moving part (10).

4. The shape memory alloy-based actuator according to claim 1, characterized in that: The sealing plug (8) is conical.

5. The shape memory alloy-based actuator according to claim 1, characterized in that: The sliding block (6) is made of insulating material.

Images