A shape memory alloy actuator

Abstract

The application discloses a shape memory alloy driver, which comprises a fixed base, a first SMA spring, a second SMA spring, a control core, a fan and a water mist generating device, the fixed base is provided with an air inlet, an air outlet, a first air duct, a second air duct and an air duct opening and closing device, the first SMA spring is installed in the first air duct, the second SMA spring is installed in the second air duct, the air inlet is communicated with one end of the first air duct and one end of the second air duct, the air outlet is communicated with the other end of the first air duct and the other end of the second air duct, the fan is installed at the air outlet and used for forming a negative pressure at the air outlet, the water mist generating device is arranged at the air inlet and used for forming water mist at the air inlet, and the air duct opening and closing device is installed at the air outlet and used for controlling the opening and closing of the air inlet, the first air duct and the second air duct, so that the first SMA spring and the second SMA spring can be independently and rapidly cooled, the driving frequency is improved, and the response speed is accelerated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission device, in particular to a shape memory alloy driver. BACKGROUND

[0002] Shape memory alloy (SMA) material can be used as a driver due to its shape memory effect, and the SMA driver has the advantages of simple structure, large driving force, high power-to-weight ratio, rapid response, etc., and has been widely used in practice, especially in aircraft wing variable structure.

[0003] The cooling time of the SMA driver directly affects the response speed of the driver, and the current cooling methods of the SMA driver include mechanical ventilation cooling, air cooling, radiator cooling, etc., but the above cooling methods all have the problem of long cooling time, which cannot meet the normal working requirements of the SMA driver; therefore, how to shorten the cooling time of the SMA driver and improve the response speed of the SMA driver has become a technical problem to be solved in the field. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a shape memory alloy driver with fast response speed.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a shape memory alloy driver, comprising a fixed base, a first SMA spring, a second SMA spring, a control core, a fan and a water mist generating device, the fixed base is provided with an air duct structure, an air inlet and an air outlet, the air duct structure comprises a first air duct, a second air duct and an air duct opening and closing device, the first SMA spring is installed in the first air duct, the second SMA spring is installed in the second air duct, the air inlet is in communication with one end of the first air duct and one end of the second air duct, the air outlet is in communication with the other end of the first air duct and the other end of the second air duct, the fan is installed at the air outlet for forming negative pressure at the air outlet; the water mist generating device is arranged at the air inlet for forming water mist at the air inlet; the air duct opening and closing device is installed at the air outlet, and the air duct opening and closing device is used to control the opening and closing of the air inlet and the first air duct and the second air duct; the air duct opening and closing device, the fan and the water mist generating device are connected with the control core respectively.

[0006] The shape memory alloy driver provided by the application has the characteristics of fast response speed, the water mist generating device, the fan and the air duct opening and closing device are controlled through the control core, the first SMA spring is installed in the first air duct, and the second SMA spring is installed in the second air duct, the water mist is formed at the air inlet through the water mist generating device, and the negative pressure is formed at the air inlet through the fan, the air flow rate in the first air duct and the second air duct is increased, and the water mist can enter the first air duct and the second air duct, and then the first SMA spring and the second SMA spring are cooled; the air inlet, the first air duct and the second air duct are opened and closed through the air duct opening and closing device, so that the first SMA spring and the second SMA spring are independently and quickly cooled, the driving frequency is improved, and the response speed is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is an exploded view of the shape memory alloy driver of the first embodiment of the application.

[0008] Figure 2 It is a structural schematic view of the bottom shell of the shape memory alloy driver of the first embodiment of the application.

[0009] Figure 3 It is a sectional structural schematic view of the shape memory alloy driver of the first embodiment of the application (in the first air duct opening state).

[0010] Figure 4 It is a sectional structural schematic view of the shape memory alloy driver of the first embodiment of the application (in the first air duct closing state).

[0011] Label explanation:

[0012] 1, fixed base; 11, bottom shell; 12, upper cover; 121, air inlet; 122, air outlet; 123, mounting part; 124, mounting groove; 13, air duct structure; 131, first air duct; 132, second air duct; 2, water tank; 21, liquid delivery pipe; 22, microporous atomizing device; 221, piezoelectric ceramic sheet; 222, metal microporous sheet; 3, driving motor; 4, fixed block; 5, first SMA spring; 6, second SMA spring; 7, air duct switching sheet; 71, first shielding part; 72, second shielding part. DETAILED DESCRIPTION

[0013] To explain the technical content, the purposes and effects of the application in detail, the following will be described in combination with the embodiments and the drawings.

[0014] Please refer to Figures 1 to 4The utility model relates to a shape memory alloy driver, including fixed baseplate 1, first SMA spring, second SMA spring 6, control core, fan and water mist generating device, the fixed baseplate 1 is equipped with air duct structure 13, air inlet 121 and air outlet 122, the air duct structure 13 includes first air duct 131, second air duct 132 and air duct opening and closing device, the first SMA spring is installed in the first air duct 131, the second SMA spring 6 is installed in the second air duct 132, the air inlet 121 with one end of the first air duct 131 and one end of the second air duct 132 are communicated, the air outlet 122 with the other end of the first air duct 131 and the other end of the second air duct 132 are communicated, the fan is installed at the air outlet 122 for forming negative pressure at the air outlet 122, the water mist generating device is equipped at the air inlet 121 for forming water mist at the air inlet 121, the air duct opening and closing device is installed at the air outlet 122, and the air duct opening and closing device is used for controlling the opening and closing of the air inlet 121 and the first air duct 131 and the second air duct 132, and the air duct opening and closing device, fan and the water mist generating device are connected with the control core respectively.

[0015] From the above description, the beneficial effects of the utility model lie in: through the control of the control core to the water mist generating device, the fan and the air duct opening and closing device, the first SMA spring 5 is installed in the first air duct 131, and the second SMA spring 6 is installed in the second air duct 132, the water mist generating device forms water mist at the air inlet 121, and the fan forms negative pressure at the air inlet 121, increases the air flow rate in the first air duct 131 and the second air duct 132, and can make the water mist enter the first air duct 131 and the second air duct 132, and then cool the first SMA spring 5 and the second SMA spring 6, the opening and closing of the air inlet 121 and the first air duct 131 and the second air duct 132 are controlled through the air duct opening and closing device, so that the first SMA spring 5 and the second SMA spring 6 are independently and quickly cooled, the driving frequency is improved, and the response speed is accelerated.

[0016] Further, the air duct opening and closing device includes a drive motor 3 and an air duct switching piece 7 connected with the output shaft of the drive motor 3, the drive motor 3 is installed on the fixed baseplate 1 and electrically connected with the control core, when the air duct switching piece 7 blocks the first air duct 131, the second air duct 132 is communicated with the air outlet 122, when the air duct switching piece 7 blocks the second air duct 132, the first air duct 131 is communicated with the air outlet 122.

[0017] From the above description, the air duct opening and closing device is simple in structure and easy to install.

[0018] Further, the air duct switching piece 7 is in V shape, the air duct switching piece 7 comprises a first shielding part 71 and a second shielding part 72 connected with each other, when the first shielding part 71 shields the first air duct 131, the second air duct 132 is communicated with the air outlet 122; when the second shielding part 72 shields the second air duct 132, the first air duct 131 is communicated with the air outlet 122.

[0019] From the above description, the air duct switching piece 7 is in V shape, so that the first air duct 131 and the air outlet 122 are in communication state at the same time, and the second air duct 132 and the air outlet 122 are in closed state; so that the second air duct 132 and the air outlet 122 are in communication state at the same time, and the first air duct 131 and the air outlet 122 are in communication state, which shortens the opening and closing time of the first air duct 131 and the second air duct 132, and is beneficial to further improve the response speed.

[0020] Further, the air duct switching piece 7 is installed upside down at the air outlet 122, when the first shielding part 71 shields the first air duct 131, the second shielding part 72 is tightly attached to the side wall of the second air duct 132; when the second shielding part 72 shields the second air duct 132, the first shielding part 71 is tightly attached to the side wall of the first air duct 131.

[0021] From the above description, when the first shielding part 71 shields the first air duct 131, the second shielding part 72 is tightly attached to the side wall of the second air duct 132, which can ensure the airtightness of the first air duct 131 when it is closed; when the second shielding part 72 shields the second air duct 132, the first shielding part 71 is tightly attached to the side wall of the first air duct 131, which can ensure the airtightness of the second air duct 132 when it is closed.

[0022] Further, the water mist generating device comprises a water tank 2 and a microporous atomizing device 22, the water tank 2 is installed on the fixed base 1 and is used for filling cooling liquid, the water tank 2 is provided with a liquid conveying pipe 21 communicated with the inside thereof, the microporous atomizing device 22 is installed at one end of the liquid conveying pipe 21 away from the water tank 2 and is electrically connected with the control core, the microporous atomizing device 22 is located at the air inlet 121 and is used for generating water mist at the air inlet 121.

[0023] Further, the fixed base 1 is provided with a mounting groove 124, the mounting groove 124 is communicated with the air inlet 121, and the microporous atomizing device 22 is installed in the mounting groove 124.

[0024] From the above description, the mounting groove 124 facilitates the installation of the microporous atomizing device 22.

[0025] Further, the microporous atomization device 22 comprises a piezoelectric ceramic sheet 221 and a metal microporous sheet 222 connected with the piezoelectric ceramic sheet 221, and the piezoelectric ceramic sheet 221 is electrically connected with the control core.

[0026] Further, the fixed base 1 is further provided with a mounting portion 123 at the air outlet 122, and the fan is mounted on the mounting portion 123.

[0027] As described above, the mounting portion 123 facilitates the mounting and fixing of the fan, thereby ensuring the stability of the operation of the fan.

[0028] Further, the fixed base 1 comprises an upper cover 12 and a bottom shell 11 connected with each other, the air duct structure 13 is formed between the upper cover 12 and the bottom shell 11, and the air inlet 121 and the air outlet 122 are both arranged on the upper cover 12.

[0029] As described above, the fixed base 1 has a simple structure and is convenient to assemble.

[0030] Further, the bottom shell 11 is further provided with a fixed block 4, and one end of the first SMA spring 5 and one end of the second SMA spring 6 are both mounted on the fixed block 4.

[0031] As described above, the fixed block 4 facilitates the fixing of the first SMA spring 5 and the second SMA spring 6, thereby ensuring the stability of the operation of the first SMA spring 5 and the second SMA spring 6.

[0032] Embodiment one

[0033] Please refer to Figures 1 to 4The embodiment one of the present application is a shape memory alloy driver, comprising a fixed base 1, a first SMA spring, a second SMA spring 6, a control core (not shown in the figure), a fan (not shown in the figure) and a water mist generating device, the fixed base 1 is provided with an air duct structure 13, an air inlet 121 and an air outlet 122, the air duct structure 13 comprises a first air duct 131, a second air duct 132 and an air duct opening and closing device, the first SMA spring is installed in the first air duct 131, the second SMA spring 6 is installed in the second air duct 132, the air inlet 121 is communicated with one end of the first air duct 131 and one end of the second air duct 132, the air outlet 122 is communicated with the other end of the first air duct 131 and the other end of the second air duct 132, the fan is installed at the air outlet 122 for forming negative pressure at the air outlet 122; the water mist generating device is arranged at the air inlet 121 for forming water mist at the air inlet 121; the air duct opening and closing device is installed at the air outlet 122, and the air duct opening and closing device is used for controlling the opening and closing of the air inlet 121 and the first air duct 131 and the second air duct 132; the air duct opening and closing device, the fan and the water mist generating device are connected with the control core respectively, the water mist generating device, the fan and the air duct opening and closing device are controlled by the control core, the first SMA spring 5 is installed in the first air duct 131, and the second SMA spring 6 is installed in the second air duct 132, water mist is formed at the air inlet 121 by the water mist generating device, and negative pressure is formed at the air inlet 121 by the fan, so as to increase the air flow rate in the first air duct 131 and the second air duct 132, and enable the water mist to enter the first air duct 131 and the second air duct 132, thereby cooling the first SMA spring 5 and the second SMA spring 6; the opening and closing of the air inlet 121 and the first air duct 131 and the second air duct 132 are controlled by the air duct opening and closing device, so as to realize independent rapid cooling of the first SMA spring 5 and the second SMA spring 6, improve the driving frequency and accelerate the response speed; in addition, the shape memory alloy driver further comprises a power supply (not shown in the figure), the power supply is electrically connected with the control core, the control core is powered by the power supply, the first SMA spring 5 and the second SMA spring 6 are connected with the control core respectively; specifically, the power supply is electrically connected with both ends of the first SMA spring 5 through the control core to form a closed loop, and the power supply is electrically connected with both ends of the second SMA spring 6 through the control core to form a closed loop; that is, the control core is used for controlling the on-off of the closed loop of the power supply, the first SMA spring 5 and the second SMA spring 6; the power supply is controlled by the control core to supply or cut off power to the first SMA spring 5 or the second SMA spring 6.

[0034] In detail, one end of the first SMA spring 5 away from the air inlet 121 and one end of the second SMA spring 6 away from the air inlet 121 are both used for connecting an external transmission member (a transmission belt, a chain, a transmission rope or the like), when the control core controls the power supply to electrify the second SMA spring 6, the second SMA spring 6 shrinks by heating, and the first SMA spring 5 is pulled to stretch by the external transmission member, at this time, the control core controls the air duct opening and closing device, so that the second air duct 132 is in communication with the air outlet 122, and the first air duct 131 is closed with the air outlet 122, under the action of the fan, the end of the second air duct 132 away from the air inlet 121 generates negative pressure, so as to suck the water mist at the air inlet 121 into the second air duct 132 to cool the second SMA spring 6 to stretch; at the same time, the control core controls the power supply to electrify the first SMA spring 5, so that the first SMA spring 5 shrinks by heating, so that the first SMA spring 5 and the second SMA spring 6 form a state of pulling each other, so as to drive the external transmission member.

[0035] Preferably, the air duct opening and closing device comprises a driving motor 3 and an air duct switching piece 7 connected with the output shaft of the driving motor 3, the driving motor 3 is installed on the fixed base 1 and is electrically connected with the control core, when the air duct switching piece 7 blocks the first air duct 131, the second air duct 132 is in communication with the air outlet 122; when the air duct switching piece 7 blocks the second air duct 132, the first air duct 131 is in communication with the air outlet 122; in detail, the air duct switching piece 7 is in V shape, the air duct switching piece 7 comprises a first blocking part 71 and a second blocking part 72 connected with each other, when the first blocking part 71 blocks the first air duct 131 (as shown in Figure 4 ), the second air duct 132 is in communication with the air outlet 122; when the second blocking part 72 blocks the second air duct 132 (as shown in Figure 3The first air duct 131 is in communication with the air outlet 122, so that the first air duct 131 is in communication with the air outlet 122 while the second air duct 132 is closed, and the second air duct 132 is in communication with the air outlet 122 while the first air duct 131 is in communication with the air outlet 122, which shortens the opening and closing time of the first air duct 131 and the second air duct 132, and is beneficial to further improve the response speed; more specifically, the air duct switching piece 7 is installed upside down at the air outlet 122, when the first shielding part 71 shields the first air duct 131, the second shielding part 72 is tightly attached to the side wall of the second air duct 132, so that the airtightness of the first air duct 131 when closed can be ensured; when the second shielding part 72 shields the second air duct 132, the first shielding part 71 is tightly attached to the side wall of the first air duct 131, so that the airtightness of the second air duct 132 when closed can be ensured.

[0036] In the embodiment, the water mist generating device comprises a water tank 2 and a microporous atomizing device 22, the water tank 2 is installed on the fixed base 1 and is used to fill cooling liquid, the water tank 2 is provided with a liquid delivery pipe 21 in communication with the inside of the water tank 2, and the microporous atomizing device 22 is installed at one end of the liquid delivery pipe 21 away from the water tank 2 and is electrically connected with the control core, the microporous atomizing device 22 is located at the air inlet 121 and is used to generate water mist at the air inlet 121; specifically, the fixed base 1 is also provided with a mounting groove 124, the mounting groove 124 is in communication with the air inlet 121, and the microporous atomizing device 22 is installed in the mounting groove 124, so that the microporous atomizing device 22 is conveniently installed; more specifically, the microporous atomizing device 22 comprises a piezoelectric ceramic sheet 221 and a metal microporous sheet 222 connected with the piezoelectric ceramic sheet 221, and the piezoelectric ceramic sheet 221 is electrically connected with the control core.

[0037] Preferably, the air outlet 122 of the fixed base 1 is also provided with a mounting part 123, and the fan is installed in the mounting part 123, so that the fan is conveniently installed and fixed, and the stability of the fan in operation is ensured; specifically, in the embodiment, the mounting part 123 is a buckle.

[0038] Preferably, the fixed base 1 comprises a connected upper cover 12 and bottom shell 11, the air duct structure 13 is formed between the upper cover 12 and the bottom shell 11, the air inlet 121 and the air outlet 122 are arranged on the upper cover 12, the fixed base 1 is simple in structure and convenient to assemble; specifically, the bottom shell 11 is further provided with a fixed block 4, one end of the first SMA spring 5 and one end of the second SMA spring 6 are respectively installed on the fixed block 4, the fixed block 4 is convenient for fixing the first SMA spring 5 and the second SMA spring 6, and the stability of the first SMA spring 5 and the second SMA spring 6 in work is ensured.

[0039] In conclusion, the shape memory alloy driver provided by the application has the characteristics of fast response speed, the water mist generating device, the fan and the air duct opening and closing device are controlled by the control core, the first SMA spring is installed in the first air duct, and the second SMA spring is installed in the second air duct, the water mist generating device forms water mist at the air inlet, and the fan forms negative pressure at the air inlet, the air flow rate in the first air duct and the second air duct is increased, and the water mist can enter the first air duct and the second air duct, and then the first SMA spring and the second SMA spring are cooled; the air inlet, the first air duct and the second air duct are controlled by the air duct opening and closing device, so that independent fast cooling of the first SMA spring and the second SMA spring is realized, the driving frequency is improved, and the response speed is accelerated.

[0040] The above is only an embodiment of the application, and does not limit the patent range of the application, any equivalent transformation or direct or indirect application in the related technical field by using the content of the specification and drawings of the application is also included in the patent protection range of the application.

Claims

1. A shape memory alloy actuator, characterized by The application relates to a fixed base, a first SMA spring, a second SMA spring, a control core, a fan and a water mist generating device, wherein the fixed base is provided with an air duct structure, an air inlet and an air outlet; the air duct structure comprises a first air duct, a second air duct and an air duct opening and closing device; the first SMA spring is installed in the first air duct; the second SMA spring is installed in the second air duct; the air inlet is communicated with one end of the first air duct and one end of the second air duct; the air outlet is communicated with the other end of the first air duct and the other end of the second air duct; the fan is installed at the air outlet and used for forming negative pressure at the air outlet; the water mist generating device is arranged at the air inlet and used for forming water mist at the air inlet; the air duct opening and closing device is installed at the air outlet and used for controlling the opening and closing of the air inlet and the first air duct and the second air duct; the air duct opening and closing device, the fan and the water mist generating device are connected with the control core; the air duct opening and closing device comprises a driving motor and an air duct switching piece connected with the output shaft of the driving motor; the driving motor is installed on the fixed base and electrically connected with the control core; when the air duct switching piece shields the first air duct, the second air duct is communicated with the air outlet; when the air duct switching piece shields the second air duct, the first air duct is communicated with the air outlet; the air duct switching piece is in a V-shaped type; the air duct switching piece comprises a first shielding part and a second shielding part connected with each other; when the first shielding part shields the first air duct, the second air duct is communicated with the air outlet; when the second shielding part shields the second air duct, the first air duct is communicated with the air outlet.

2. The shape memory alloy driver of claim 1, wherein The air duct switching piece is installed reversely at the air outlet; when the first shielding part shields the first air duct, the second shielding part is tightly attached to the side wall of the second air duct; when the second shielding part shields the second air duct, the first shielding part is tightly attached to the side wall of the first air duct.

3. The shape memory alloy driver of claim 1, wherein, The water mist generating device comprises a water tank and a micro-porous atomizing device; the water tank is installed on the fixed base and used for filling cooling liquid; the water tank is provided with a liquid conveying pipe communicated with the inside of the water tank; the micro-porous atomizing device is installed at the end of the liquid conveying pipe far away from the water tank and electrically connected with the control core; the micro-porous atomizing device is located at the air inlet and used for generating water mist at the air inlet.

4. The shape memory alloy driver of claim 3, wherein, The fixed base is provided with an installation groove communicated with the air inlet; the micro-porous atomizing device is installed in the installation groove.

5. The shape memory alloy driver of claim 3, wherein, The micro-porous atomizing device comprises a piezoelectric ceramic piece and a metal micro-porous piece connected with the piezoelectric ceramic piece; the piezoelectric ceramic piece is electrically connected with the control core.

6. The shape memory alloy driver of claim 1, wherein, The air outlet of the fixed base is further provided with an installation part; the fan is installed in the installation part.

7. The shape memory alloy driver of claim 1, wherein, The fixed base comprises an upper cover and a bottom shell connected with each other; the air duct structure, the air inlet and the air outlet are arranged between the upper cover and the bottom shell.

8. The shape memory alloy driver of claim 7, wherein, The bottom shell is further provided with a fixing block, one end of the first SMA spring and one end of the second SMA spring are respectively installed on the fixing block.

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