Shape memory alloy actuating valve

Abstract

According to the shape memory alloy actuating valve, the valve element is arranged in the valve body, the first elastic piece, the second elastic piece and the SMA driving part are further arranged to drive the valve element to slide in the valve body, and then a communication channel between the first valve hole and the second valve hole is opened or closed. Moreover, an SMA wire of the SMA driving part is further arranged to be wound around the valve element, so that contraction or relaxation of the SMA wire can be controlled according to whether the SMA wire is powered on or not, deformation force for driving the valve element to overcome the second elastic force to open the communicating channel in a sliding mode can be output, the overall structure of the valve is simple, the SMA wire is large in driving force, the power-weight ratio is high, response is rapid, and the service life of the valve is prolonged. Compared with an electromagnetic valve, the volume and the weight occupied by the coil and the magnetic piece can be effectively reduced, and the problem that an existing electromagnetic valve is large in volume and weight is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a shape memory alloy actuated valve. Background Art

[0002] Valves are essential mechanical devices in modern industry, agriculture, chemical industry and daily life. They are mainly used for cutting off, throttling, regulating pressure and changing flow direction of pipeline media. At present, the mainstream valves are mainly solenoid valves, which use electromagnetic coils to generate magnetic force to drive the valve core to clutch the valve port to open and close the valve. Solenoid valves are affected by magnetic field strength or coil resistance fluctuations, voltage shocks, etc., and are prone to problems such as poor valve opening, high noise, and even failure to open the valve. In addition, actual solenoid valves cannot make the most reasonable use of electromagnetic force and power, resulting in a waste of power consumption. To obtain sufficient electromagnetic force, the coil volume and weight are relatively large. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a shape memory alloy actuated valve to solve the problem that the existing electromagnetic valve has a relatively large volume and a relatively large weight.

[0004] To solve the above problems, the technical solution of the utility model is:

[0005] The utility model discloses a shape memory alloy actuated valve, comprising:

[0006] A valve body, wherein the valve body is provided with a communication passage connecting the first valve hole and the second valve hole;

[0007] A valve core is slidably connected to the valve body, and the valve core is configured to open or close the communication channel;

[0008] a first elastic member, arranged in the valve body and connected to the valve core, the first elastic member being configured to absorb an impact force of the valve core sliding in the valve body;

[0009] a second elastic member, arranged in the valve body and connected to the valve core, the second elastic member being configured to output a second elastic force for pushing the valve core to close the communication channel;

[0010] An SMA drive unit is provided on the valve body, at least part of the SMA wire of the SMA drive unit is wound around the valve core, and both ends of the SMA wire are located on a side of the valve core away from the first elastic member, and the SMA wire is configured to output a deformation force to pull the valve core to open the communication channel;

[0011] The second elastic force is greater than the first elastic force, and a resultant force of the first elastic force and the deformation force is greater than the second elastic force.

[0012] The shape memory alloy actuated valve of the utility model comprises a valve body and a base;

[0013] The valve body is provided with a valve core accommodating opening with a bottom opening, and the top of the valve body is provided with the above-mentioned first valve hole and the second valve hole communicating with the valve core accommodating opening;

[0014] The base is installed at the bottom of the valve body and covers the valve core accommodating opening. The base and the valve core accommodating opening cooperate to form a valve core accommodating chamber. The valve core is slidably connected to the valve core accommodating chamber.

[0015] In the shape memory alloy actuated valve of the utility model, a guide protrusion is provided on the surface of the base facing the valve core accommodating chamber, a vertical guide hole is provided on the guide protrusion, and a guide block matching the vertical guide hole is provided on the valve core.

[0016] In the shape memory alloy actuated valve of the utility model, the second elastic member is arranged in the vertical guide hole.

[0017] In the shape memory alloy actuated valve of the utility model, an annular clamping groove is arranged on the bottom surface of the valve body, and an annular clamping protrusion corresponding to the annular clamping groove is arranged on the base.

[0018] The shape memory alloy actuated valve of the utility model, the valve core comprises a valve core body and a guide block connected to the bottom of the valve core body;

[0019] The top surface of the valve core body is provided with an annular fitting top surface for surrounding and fitting to the circumference of the second valve hole; and the valve core body is provided with a winding groove for winding the SMA wire, and the plane where the winding track in the winding groove is located is parallel to the sliding direction of the valve core body.

[0020] In the shape memory alloy actuated valve of the utility model, an extension protrusion corresponding to the second valve hole is provided on the surface of the valve body facing the valve core body; a recessed groove corresponding to the extension protrusion is provided on the top surface of the valve core body, and the first elastic member is arranged in the recessed groove.

[0021] The shape memory alloy actuated valve of the utility model, the SMA driving part comprises an SMA wire and two electrical connectors;

[0022] The two electrical connectors are respectively buried in one end of the valve body away from the second valve hole, the SMA wire is wound around the valve core, and two ends of the SMA wire are respectively connected to the two electrical connectors.

[0023] In the shape memory alloy actuated valve of the utility model, the first elastic member is a first compression spring, the second elastic member is a second compression spring, and the elastic coefficient of the first compression spring is smaller than that of the second compression spring.

[0024] The shape memory alloy actuated valve of the utility model is made of insulating material.

[0025] The utility model discloses a shape memory alloy actuated valve, comprising:

[0026] A valve body, wherein a plurality of groups of first valve holes and second valve holes corresponding to each other are provided in the valve body, and a communication channel is provided between each group of the first valve holes and the second valve holes;

[0027] A plurality of valve cores, slidably connected to the valve body and corresponding to the communication channels one by one, the valve cores being configured to open or close the corresponding communication channels;

[0028] A plurality of first elastic members, arranged in the valve body and connected to the corresponding valve cores, the first elastic members being configured to absorb the impact force of the valve core sliding in the valve body;

[0029] A plurality of second elastic members, arranged in the valve body and connected to the corresponding valve cores, the second elastic members being configured to output a second elastic force that pushes the valve core to close the communication channel;

[0030] A plurality of SMA drive parts are arranged on the valve body, at least part of the SMA wires of the SMA drive parts are wound around the corresponding valve core, and both ends of the SMA wires are located on the side of the valve core away from the first elastic member, and the SMA wires are configured to output a deformation force to pull the valve core to open the communication channel;

[0031] The second elastic force is greater than the first elastic force, and a resultant force of the first elastic force and the deformation force is greater than the second elastic force.

[0032] Due to the adoption of the above technical solution, the utility model has the following advantages and positive effects compared with the prior art:

[0033] In one embodiment of the utility model, a valve core is arranged in the valve body, and a first elastic member, a second elastic member and an SMA driving unit are further arranged to drive the valve core to slide in the valve body, thereby realizing the opening or closing of the communication channel between the first valve hole and the second valve hole. In addition, the SMA wire of the SMA driving unit is further arranged to be wound around the valve core, so that the contraction or relaxation of the SMA wire can be controlled by whether the SMA wire is energized or not, and then the deformation force that drives the valve core to overcome the second elastic force to slide and open the communication channel can be output. The overall structure of the valve is simple, and the driving force of the SMA wire is large, the power-to-weight ratio is high, and the response is fast. Compared with the solenoid valve, the volume and weight occupied by the coil and the magnetic part can be effectively reduced, solving the problem of relatively large volume and weight of the existing solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional view of the shape memory alloy actuated valve of the utility model;

[0035] Figure 2 It is a schematic diagram of a shape memory alloy actuated valve of the utility model;

[0036] Figure 3 It is a schematic diagram of the valve core part of the shape memory alloy actuated valve of the utility model;

[0037] Figure 4 A side view of the valve core portion of the shape memory alloy actuated valve of the utility model;

[0038] Figure 5 A schematic diagram of a valve body of a shape memory alloy actuated valve of the present invention;

[0039] Figure 6 It is a schematic diagram of the SMA driving part of the shape memory alloy actuated valve of the utility model;

[0040] Figure 7 It is a schematic diagram of the winding groove of the shape memory alloy actuated valve of the utility model.

[0041] Explanation of the reference numerals: 1. Valve body; 101. First valve hole; 102. Second valve hole; 103. Annular clamping groove; 104. Extended protrusion; 2. Base; 201. Guide protrusion; 202. Annular clamping convex block; 3. Valve core body; 301. Recessed groove; 302. Winding groove; 4. Guide block; 5. SMA wire; 6. First elastic member; 7. Second elastic member; 8. SMA wire claw; 9. SMA wire power pin. DETAILED DESCRIPTION

[0042] The shape memory alloy actuated valve proposed by 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.

[0043] See also Figures 1 to 7 In one embodiment, a shape memory alloy actuated valve includes a valve body, a valve core, a first elastic member 6, a second elastic member 7 and an SMA driving part.

[0044] The valve body is provided with a communication channel connecting the first valve hole 101 and the second valve hole 102. The valve core is slidably connected to the valve body, and the valve core is configured to open or close the communication channel.

[0045] The first elastic member 6 is arranged in the valve body and connected to the valve core. The first elastic member 6 is configured to absorb the impact force of the valve core sliding in the valve body, that is, to absorb the kinetic energy when the valve core hits the valve body, which plays a role in reducing the impact noise and is used for noise reduction. The second elastic member 7 is arranged in the valve body and connected to the valve core. The second elastic member 7 is configured to output a second elastic force that pushes the valve core to close the communication channel. The SMA drive unit is arranged in the valve body, and at least part of the SMA wire 5 of the SMA drive unit is wound around the valve core, and both ends of the SMA wire 5 are located on the side of the valve core away from the first elastic member 6. The SMA wire 5 is configured to output a deformation force that pulls the valve core to open the communication channel.

[0046] The second elastic force is greater than the first elastic force, and the resultant force of the first elastic force and the deformation force is greater than the second elastic force.

[0047] In this embodiment, a valve core is arranged in the valve body, and a first elastic member 6, a second elastic member 7 and an SMA driving unit are further arranged to drive the valve core to slide in the valve body, thereby realizing the opening or closing of the communication channel between the first valve hole 101 and the second valve hole 102. In addition, the SMA wire 5 of the SMA driving unit is further arranged to be wound around the valve core, so that the contraction or relaxation of the SMA wire 5 can be controlled by whether the SMA wire 5 is energized or not, and then the deformation force that drives the valve core to overcome the second elastic force to slide and open the communication channel can be output. The overall structure of the valve is simple, and the driving force of the SMA wire 5 is large, the power-to-weight ratio is high, and the response is fast. Compared with the solenoid valve, the volume and weight occupied by the coil and the magnetic part can be effectively reduced, solving the problem of relatively large volume and weight of the existing solenoid valve.

[0048] The specific structure of the shape memory alloy actuated valve of this embodiment is further described below:

[0049] In this embodiment, the valve body may specifically include a valve body 1 and a base 2. A valve core accommodating opening with a bottom opening is provided in the valve body 1, and the top of the valve body 1 is provided with the above-mentioned first valve hole 101 and second valve hole 102 communicating with the valve core accommodating opening (a connection interface may be provided on the valve body 1 corresponding to the first valve hole 101). The base 2 is installed at the bottom of the valve body 1 and covers the valve core accommodating opening. The base 2 cooperates with the valve core accommodating opening to form a valve core accommodating chamber, and the valve core is slidably connected to the valve core accommodating chamber. That is, the above-mentioned first valve hole 101 and the second valve hole 102 are specifically arranged on the top surface of the valve core accommodating chamber, wherein the second valve hole 102 can be set to be located at the central position of the top surface, and the first valve hole 101 can be set to be laterally offset on the top surface relative to the second valve hole 102, and the space between the two valve holes in the valve core accommodating chamber is the above-mentioned connecting passage, and the valve core can be specifically set to be vertically slidably connected in the valve core accommodating chamber, for moving up and fitting to the top surface of the valve core accommodating chamber to close the connecting passage, the first elastic member 6 can be set between the valve core and the top surface of the valve core accommodating chamber (for preventing the valve core from hitting the top surface of the valve core accommodating chamber), and the second elastic member 7 can be set between the valve core and the bottom surface of the valve core accommodating chamber.

[0050] In this embodiment, in order to guide the sliding of the valve core, a guide protrusion 201 (the guide protrusion 201 can be specifically cylindrical) is provided on the surface of the base 2 facing the valve core accommodating chamber, and a vertical guide hole is provided on the guide protrusion 201 (the vertical guide hole can be set to be coaxial with the second valve hole 102), and a guide block 4 matching the vertical guide hole is provided on the valve core, and the guide block 4 extends into the vertical guide hole to achieve sliding connection and guidance.

[0051] Furthermore, in order to reduce the volume of the valve as much as possible, the second elastic member 7 is arranged in the vertical guide hole, and the elastic force is applied to the guide block 4 to push the valve core to close the communication channel.

[0052] In this embodiment, in order to further improve the sealing performance of the connection position between the valve body 1 and the base 2, an annular clamping groove 103 is provided on the bottom surface of the valve body 1, and an annular clamping protrusion 202 corresponding to the annular clamping groove 103 is provided on the base 2. The annular clamping protrusion 202 can be clamped into the annular clamping groove 103 to form an effect similar to a labyrinth seal.

[0053] In this embodiment, the valve core may specifically include a valve core body 3 and a guide block 4 connected to the bottom of the valve core body 3 .

[0054] The top surface of the valve core body 3 is provided with an annular fitting top surface for surrounding and fitting to the circumference of the second valve hole 102 (the annular fitting top surface can be set to avoid or partially avoid the first valve hole 101); and a winding groove 302 for winding the SMA wire 5 is provided in the valve core body 3 (the winding groove 302 can specifically include an arcuate groove section located in the center and vertically extending grooves connected to the two ends of the arcuate groove section, and the opening formed by the arcuate trajectory of the arcuate groove section faces the base 2), and the plane where the winding trajectory in the winding groove 302 is located is parallel to the sliding direction of the valve core body 3. This parallel arrangement can make the deformation force output by the SMA wire 5 and the above-mentioned two elastic forces in the same direction.

[0055] Specifically, the valve core body 3 may include a connecting wall, on which a valve core block and a winding block are horizontally arranged in sequence above and below, and the valve core block and the winding block are arranged at intervals. The top surface of the valve core block is the top surface of the above-mentioned valve core body 3, and the winding groove 302 is set at the connection between the winding block and the connecting wall. During installation, the SMA wire 5 can be installed from the gap between the valve core block and the winding block into the winding groove 302.

[0056] Furthermore, the surface of the valve body facing the valve core body 3 (i.e., the top surface of the valve core accommodating cavity) is provided with an extension protrusion 104 corresponding to the second valve hole 102. The top surface of the valve core body 3 is provided with a recessed groove 301 corresponding to the extension protrusion 104, and the first elastic member 6 mentioned above can be arranged in the recessed groove 301. This arrangement is convenient for the installation of the first elastic member 6 and can serve as a guide when the valve core body 3 closes the communication channel (wherein, the first elastic member 6 can be arranged so that one end surrounds the extension protrusion 104 and the other end extends into the recessed groove 301).

[0057] In this embodiment, the SMA driving part may specifically include an SMA wire 5 and two electrical connectors.

[0058] The two electrical connectors are respectively buried in one end of the valve body away from the second valve hole 102 (that is, buried in the base 2 and respectively located on both sides of the above-mentioned guide protrusion 201), and the SMA wire 5 is wound around the valve core (the SMA wire 5 can be divided into a first section, a middle section and a tail section connected in sequence, the middle section is correspondingly wound in the above-mentioned arc groove, and part of the first section and part of the tail section are respectively arranged in the above-mentioned two vertical extension grooves), and the two ends of the SMA wire 5 are respectively connected to the two electrical connectors (that is, the first section and the tail section extend downward and are respectively connected to the two electrical connectors).

[0059] The above-mentioned electrical connector may specifically include an SMA wire power pin 9 and an SMA wire claw 8. The SMA wire power pin 9 is buried in the base 2, and the input end of the SMA wire power pin 9 extends out of the base 2 for connecting to an external power supply; the SMA wire claw 8 is also buried in the base 2 and electrically connected to the SMA wire power pin 9, and the clamping end of the SMA wire claw 8 extends upward into the valve core accommodating chamber to clamp the corresponding SMA wire 5.

[0060] In this embodiment, the first elastic member 6 can be a first compression spring (or an elastic material such as rubber or sound-absorbing cotton), and the second elastic member 7 can be a second compression spring. The elastic coefficient of the first compression spring is smaller than that of the second compression spring.

[0061] In this embodiment, in view of the need for power supply and cost of the SMA wire 5, the valve body (valve body 1 and base 2) is made of insulating material (such as plastic), and the valve core (valve core body 3 and guide block 4) can be set as a metal part.

[0062] The specific working principle of the shape memory alloy actuated valve of this embodiment is as follows:

[0063] The SMA wire 5 is parallel to the axis of the guide hole and is wound around the valve core body 3;

[0064] When the SMA wire 5 is energized and contracts, it drives the valve core body 3 to move downward along the vertical guide hole. At this time, the top surface of the valve core body 3 is separated from the top surface of the valve core accommodating chamber, thereby connecting the first valve hole 101 and the second valve hole 102 to form a flow conduction loop (the above-mentioned communication channel);

[0065] When the SMA wire 5 is de-energized and relaxed, the valve core body 3 is compressed by the first compression spring and the second compression spring. Since the elastic coefficient of the second compression spring is greater than that of the first compression spring, the valve core body 3 moves upward along the vertical guide hole. At this time, the top surface of the valve core body 3 is pressed against the top surface of the valve core accommodating chamber, cutting off the flow conduction circuit (the above-mentioned connecting channel) formed between the first valve hole 101 and the second valve hole 102.

[0066] Embodiment 2

[0067] Based on the above-mentioned first embodiment, this embodiment provides a shape memory alloy actuated valve, including a valve body, a plurality of valve cores, a plurality of first elastic members, a plurality of second elastic members and a plurality of SMA driving parts.

[0068] The valve body is provided with a plurality of groups of first valve holes and / or second valve holes corresponding to each other, and a communication channel is provided between each group of first valve holes and second valve holes. A plurality of valve cores are slidably connected to the valve body and correspond to the communication channels one by one, and the valve cores are configured to open or close the corresponding communication channels.

[0069] A plurality of first elastic members are arranged in the valve body and connected to corresponding valve cores, and the first elastic members are configured to absorb the impact force of the valve core sliding in the valve body. A plurality of second elastic members are arranged in the valve body and connected to corresponding valve cores, and the second elastic members are configured to output a second elastic force that pushes the valve core to close the communication channel.

[0070] Several SMA drive parts are arranged on the valve body, at least part of the SMA wire of the SMA drive part is wound around the corresponding valve core, and both ends of the SMA wire are located on the side of the valve core away from the first elastic member. The SMA wire is configured to output a deformation force to pull the valve core to open the connecting channel.

[0071] The second elastic force is greater than the first elastic force, and the resultant force of the first elastic force and the deformation force is greater than the second elastic force.

[0072] The only difference between this embodiment and the above-mentioned embodiment 1 is that a plurality of valve cores, a first elastic member, a second elastic member and an SMA driving unit are arranged in a valve body, thereby forming a plurality of connected flow conducting circuits (the above-mentioned connecting channels). The rest of the contents are similar to the above-mentioned embodiment 1 and will not be repeated.

[0073] The above is a detailed description of the embodiments of the present invention 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 shape memory alloy actuated valve, characterized in that: include: A valve body, wherein the valve body is provided with a communication passage connecting the first valve hole and the second valve hole; A valve core is slidably connected to the valve body, and the valve core is configured to open or close the communication channel; a first elastic member, arranged in the valve body and connected to the valve core, the first elastic member being configured to absorb an impact force of the valve core sliding in the valve body; a second elastic member, arranged in the valve body and connected to the valve core, the second elastic member being configured to output a second elastic force for pushing the valve core to close the communication channel; An SMA drive unit is provided on the valve body, at least part of the SMA wire of the SMA drive unit is wound around the valve core, and both ends of the SMA wire are located on a side of the valve core away from the first elastic member, and the SMA wire is configured to output a deformation force to pull the valve core to open the communication channel; The second elastic force is greater than the first elastic force of the first elastic member, and the resultant force of the first elastic force and the deformation force is greater than the second elastic force.

2. The shape memory alloy actuated valve according to claim 1, characterized in that: The valve body comprises a valve body and a base; The valve body is provided with a valve core accommodating opening with a bottom opening, and the top of the valve body is provided with the above-mentioned first valve hole and the second valve hole communicating with the valve core accommodating opening; The base is installed at the bottom of the valve body and covers the valve core accommodating opening. The base and the valve core accommodating opening cooperate to form a valve core accommodating chamber. The valve core is slidably connected to the valve core accommodating chamber.

3. The shape memory alloy actuated valve according to claim 2, characterized in that: A guide protrusion is provided on the surface of the base facing the valve core accommodating chamber, a vertical guide hole is provided on the guide protrusion, and a guide block matching the vertical guide hole is provided on the valve core.

4. The shape memory alloy actuated valve according to claim 3, characterized in that: The second elastic member is arranged in the vertical guide hole.

5. The shape memory alloy actuated valve according to claim 2, characterized in that: An annular clamping groove is arranged on the bottom surface of the valve body, and an annular clamping protrusion corresponding to the annular clamping groove is arranged on the base.

6. The shape memory alloy actuated valve according to claim 1, characterized in that: The valve core comprises a valve core body and a guide block connected to the bottom of the valve core body; The top surface of the valve core body is provided with an annular fitting top surface for surrounding and fitting to the circumference of the second valve hole; and the valve core body is provided with a winding groove for winding the SMA wire, and the plane where the winding track in the winding groove is located is parallel to the sliding direction of the valve core body.

7. The shape memory alloy actuated valve according to claim 6, characterized in that: An extending protrusion corresponding to the second valve hole is provided on the surface of the valve body facing the valve core body; a recessed groove corresponding to the extending protrusion is provided on the top surface of the valve core body, and the first elastic member is arranged in the recessed groove.

8. The shape memory alloy actuated valve according to claim 1, characterized in that: The SMA driving part includes an SMA wire and two electrical connectors; The two electrical connectors are respectively buried in one end of the valve body away from the second valve hole, the SMA wire is wound around the valve core, and two ends of the SMA wire are respectively connected to the two electrical connectors.

9. The shape memory alloy actuated valve according to claim 1, characterized in that: The first elastic member is a first compression spring, the second elastic member is a second compression spring, and the elastic coefficient of the first compression spring is smaller than that of the second compression spring.

10. The shape memory alloy actuated valve according to claim 1, characterized in that: The valve body is made of insulating material.

11. A shape memory alloy actuated valve, characterized in that: include: A valve body, wherein a plurality of groups of first valve holes and / or second valve holes corresponding to each other are provided in the valve body, and a communication channel is provided between each group of the first valve holes and the second valve holes; A plurality of valve cores, slidably connected to the valve body and corresponding to the communication channels one by one, the valve cores being configured to open or close the corresponding communication channels; A plurality of first elastic members, arranged in the valve body and connected to the corresponding valve cores, the first elastic members being configured to absorb the impact force of the valve core sliding in the valve body; A plurality of second elastic members, arranged in the valve body and connected to the corresponding valve cores, the second elastic members being configured to output a second elastic force that pushes the valve core to close the communication channel; A plurality of SMA drive parts are arranged on the valve body, at least part of the SMA wires of the SMA drive parts are wound around the corresponding valve core, and both ends of the SMA wires are located on the side of the valve core away from the first elastic member, and the SMA wires are configured to output a deformation force to pull the valve core to open the communication channel; The second elastic force is greater than the first elastic force of the first elastic member, and the resultant force of the first elastic force and the deformation force is greater than the second elastic force.

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