A layered structure memory alloy pneumatic control device

Abstract

The application discloses a layered structure memory alloy pneumatic control device, and relates to the technical field of automobile seats.The device comprises a shell, an installation chamber formed in the hollow interior of the shell, a pneumatic control unit arranged in the installation chamber, a circuit board and a gas path control assembly arranged adjacently, the gas path control assembly comprising a first layer space and a second layer space arranged side by side along a first direction and being in communication with each other, the gas path control assembly comprising a first valve group and a second valve group, the first valve group comprising a plurality of first valve cores, the second valve group comprising at least one second valve core, and the first valve group and the second valve group being connected through a memory alloy wire and the circuit board; the on-off state of the circuit board is used to adjust the memory alloy wire to apply or release external tension to the first valve cores and the second valve cores, control the first valve group to form a state of inflation, deflation or pressure maintaining, and control the second valve group to form a state of inflation or deflation.

Description

Technical Field

[0001] This application generally relates to the field of automotive seat technology, and specifically to a pneumatic control device for a layered structure memory alloy. Background Technology

[0002] With the advancement of technology in the vehicle transportation sector, people have increasingly higher demands for vehicle ride comfort. Inflatable lumbar supports and massage devices for seats have emerged to effectively address back fatigue caused by long hours of driving or sitting. Currently, some vehicles on the market have airbags inside the seat backs, with a built-in air source. A controller inflates and deflates the airbags to achieve the massage effect.

[0003] The controller includes multiple valves corresponding to the air bags. The air bags are inflated and deflated by controlling the valves. Currently, most of the valves in the controller are arranged in a line. The more air bags there are, the larger the controller becomes. However, the available space inside a car is limited, which imposes limitations on the design of the controller. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a layered structure shape memory alloy pneumatic control device that saves space and is conducive to product development and design.

[0005] In a first aspect, this application provides a pneumatic control device for a layered shape memory alloy, comprising: A housing, the interior of which is hollow to form an installation chamber; At least one set of pneumatic control units is disposed inside the mounting chamber. The pneumatic control unit includes a circuit board and a pneumatic path control assembly. The pneumatic path control assembly is disposed adjacent to the circuit board. The pneumatic path control assembly has a first layer space and a second layer space arranged side by side and communicating with each other along a first direction, the first direction being perpendicular to the circuit board. The pneumatic path control assembly includes a first valve group and a second valve group. The first valve group is disposed in the first layer space and / or the second layer space, and the second valve group is disposed in the first layer space and / or the second layer space. The first valve group has a plurality of first valve cores, and the second valve group has at least one second valve core. The first valve core and the second valve core are connected to the circuit board through shape memory alloy wires, and the shape memory alloy wires are connected to both sides of the circuit board. By adjusting the power-on / off state of the circuit board, the shape memory alloy wire applies or releases external tension to the corresponding first valve core and second valve core, thereby controlling the first valve group to form an inflation, deflation, or pressure-holding state, and controlling the second valve group to form an inflation or deflation state.

[0006] According to the technical solution provided in the embodiments of this application, the housing includes an upper shell and a lower shell, the upper shell and the lower shell being connected to form the mounting chamber.

[0007] According to the technical solution provided in the embodiments of this application, the pneumatic control unit further includes: A bottom cover, on which an outer shell is provided; a receiving space is formed between the bottom cover and the outer shell; The portion of the accommodating space near the upper shell forms the first layer of space, and the portion of the accommodating space near the lower shell forms the second layer of space; Alternatively, the portion of the accommodating space near the upper shell forms the second layer of space, and the portion of the accommodating space near the lower shell forms the first layer of space.

[0008] According to the technical solution provided in the embodiments of this application, the first valve group includes: a plurality of first valve body structures arranged side by side; The first valve body structure includes: Two first air ports are provided on the outer shell and are connected to the accommodating space. One first air port forms a first vent to discharge the gas in the accommodating space to the outside of the accommodating space, and the other first air port forms an air inlet to connect with a gas source. A first vent is connected to the accommodating space and is used to connect a ventilation component. A first valve core is disposed within the accommodating space; one end of the first valve core is correspondingly disposed to the first air port, and the other end penetrates the bottom cover and is movable relative to the bottom cover. The first sealing element is disposed on the bottom cover near the first air port; one end of the first sealing element is connected to the bottom cover, and the other end is engaged with the side wall of the first valve core. A first elastic element is sleeved on the first valve core, and a first seal is located between the first elastic element and the first valve core.

[0009] According to the technical solution provided in the embodiments of this application, the installation chamber is further provided with a venting chamber corresponding to the first vent, and the venting chamber is connected to the first vent; the venting chamber is provided with a vent hole connected to the installation chamber.

[0010] According to the technical solution provided in the embodiments of this application, the second valve group includes: a plurality of second valve body structures arranged side by side; The second valve body structure includes: The second air port is located on the outer shell and communicates with the receiving space; the second air port forms an air inlet for communicating with an air source. The second vent is connected to the accommodating space and is also connected to the gas-using component. The second valve core is disposed within the accommodating space; one end of the second valve core is correspondingly disposed to the second air port, and the other end passes through the bottom cover and is movable relative to the bottom cover. The second vent is provided on the bottom cover; The second elastic element is sleeved on the second valve core.

[0011] According to the technical solution provided in the embodiments of this application, the first layer space and the second layer space are respectively provided with air passages, and the two air passages are connected by air holes.

[0012] According to the technical solution provided in the embodiments of this application, the bottom cover has a groove, the opening of the groove faces the second valve core; the bottom of the groove has a second vent. When the second valve core moves toward the side closer to the bottom cover, it can block the second vent.

[0013] According to the technical solution provided in the embodiments of this application, the two ends of the memory alloy wire are electrically connected to the circuit board through connecting terminals; a fixed end is formed in the middle of the memory alloy wire, and the fixed end is connected to the corresponding first valve core or second valve core.

[0014] According to the technical solution provided in the embodiments of this application, the connecting terminals of all the shape memory alloy wires are staggered on the circuit board.

[0015] As can be seen from the above technical solution, this application has at least the following beneficial effects: This application discloses a layered shape memory alloy pneumatic control device. The device includes: a housing with a hollow interior forming an installation chamber, wherein at least one set of pneumatic control units is disposed inside the installation chamber, each including an adjacent circuit board and a pneumatic control assembly. Specifically, the pneumatic control assembly has a first layer space and a second layer space arranged side by side and interconnected along a first direction, the first direction being perpendicular to the circuit board; the pneumatic control assembly includes a first valve group and a second valve group, the first valve group being disposed within the first layer space and / or the second layer space, and the second valve group being disposed within the first layer space and / or the second layer space; the first valve group has multiple first valve cores, the second valve group has at least one second valve core, and the first valve core and the second valve core are connected to both sides of the circuit board via shape memory alloy wires. By adjusting the on / off state of the circuit board, the shape memory alloy wires apply or release external tension to the corresponding first valve core and second valve core, thereby controlling the first valve group to form an inflation, deflation, or pressure holding state, and controlling the second valve group to form an inflation or deflation state.

[0016] This application designs at least one set of pneumatic control units in the mounting chamber of the housing. Each pneumatic control unit includes adjacent pneumatic control components and a circuit board. The pneumatic control components are designed with a first layer and a second layer, arranged along a first direction and interconnected, for mounting a first valve group and / or a second valve group, respectively. This creates a double-layer arrangement of the first and / or second valve groups within the device. The first valve core of the first valve group and the second valve core of the second valve group are connected to both sides of the circuit board via shape memory alloy wires. The circuit board controls the inflation, deflation, or pressure holding states of the first valve group and the inflation and deflation states of the second valve group. In other words, integrating valve groups with different functions or multiple valve groups performing the same function together results in higher integration of the entire device, maximizing space savings and facilitating product development and design. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0018] Figure 1 This is an exploded view of a shape memory alloy pneumatic control device.

[0019] Figure 2 This is a cross-sectional view of the shape memory alloy pneumatic control device through the first air inlet.

[0020] Figure 3 This is a cross-sectional view of the shape memory alloy pneumatic control device through the second valve core.

[0021] Figure 4 This is a front view of a shape memory alloy pneumatic control device.

[0022] Figure 5This is a schematic diagram of the shell structure.

[0023] Figure 6 This is a cross-sectional view of the first layer of space in the shape memory alloy pneumatic control device.

[0024] Figure 7 This is a partial cross-sectional view of the second-layer space of the shape memory alloy pneumatic control device.

[0025] Figure 8 This is a cross-sectional view of the shape memory alloy pneumatic control device through the second air inlet.

[0026] The following are the labels in the diagram: 1. Circuit board; 2. First valve core; 3. Second valve core; 4. Upper shell; 5. Lower shell; 6. Bottom cover; 7. Outer shell; 8. Accommodation space; 9. First air port; 10. First sealing element; 11. First elastic element; 12. Vent chamber; 13. Vent hole; 14. Second air port; 15. Rubber cap; 16. Second elastic element; 17. Air passage; 18. Air hole; 19. Shape memory alloy wire; 20. Connecting terminal; 21. Air inlet nozzle; 22. Vent groove; 23. Air nozzle; 24. First vent; 25. First air vent; 26. Second air vent; 27. Second vent. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To make the pneumatic control device for layered shape memory alloys provided in this application clearer and easier to understand, the device will be described below with reference to the accompanying drawings. Figure 1 , Figure 2 and Figure 3 As shown, the device includes: The housing has a hollow interior forming an installation chamber; the housing includes an upper shell 4 and a lower shell 5, which are connected to form the installation chamber. Figure 5 As shown, the upper shell 4 and the lower shell 5 are snap-fitted together, making disassembly and assembly more convenient. Furthermore, a fixing seat is provided on the same side of the upper shell 4 and the lower shell 5 for installing the device in the required position.

[0030] At least one set of pneumatic control units is disposed inside the mounting chamber; the pneumatic control unit includes a circuit board 1 and a pneumatic control assembly, the pneumatic control assembly being disposed adjacent to the circuit board 1; the pneumatic control assembly has a first layer space and a second layer space arranged side by side and interconnected along a first direction, the first direction being perpendicular to the circuit board 1; the pneumatic control assembly includes a first valve group and a second valve group, the first valve group being disposed in the first layer space and / or the second layer space, and the second valve group being disposed in the first layer space and / or the second layer space; the first valve group has a plurality of first valve cores 2, and the second valve group has at least one second valve core 3.

[0031] It should be noted that the pneumatic control unit also includes: The bottom cover 6 has an outer shell 7 on it; a receiving space 8 is formed between the bottom cover 6 and the outer shell 7; here, the bottom cover 6 and the outer shell 7 can be connected by laser welding or ultrasonic welding.

[0032] The portion of the accommodating space 8 near the upper shell 4 forms the first layer of space, and the portion of the accommodating space 8 near the lower shell 5 forms the second layer of space; Alternatively, the portion of the accommodating space 8 near the upper shell 4 forms a second layer of space, and the portion of the accommodating space 8 near the lower shell 5 forms a first layer of space.

[0033] The accommodating space 8 is divided into two spaces according to the part near the upper shell 4 and the part near the lower shell 5. One space is defined as the first layer space and the other space is defined as the second layer space. Here, it is only to distinguish between the two spaces. This application only restricts the division method of the two spaces and does not restrict the size of the two spaces. The purpose is to form two spaces for placing valve groups with different functions or multiple valve groups with the same function. That is, it allows two valve groups with different functions or multiple valve groups that achieve the same function to be integrated in the same accommodating space 8, thereby improving the integration of the pneumatic control device.

[0034] like Figure 6 As shown, the first valve assembly includes: multiple first valve body structures arranged side by side; the number of first valve body structures is set according to actual needs. Specifically, the first valve body structure includes: Two first air ports 9 are provided on the outer shell 7. The first air ports 9 are connected to the receiving space 8. One first air port 9 forms a first vent, which is used to discharge the gas in the receiving space 8 to the outside of the receiving space 8. The other first air port 9 forms an air inlet, which is used to connect with the gas source. The first vent 25 is connected to the receiving space 8 and is used to connect the venting component. The first valve core 2 is disposed within the accommodating space 8. One end of the first valve core 2 is correspondingly disposed with the first air port 9, and the other end passes through the bottom cover 6 and is movable relative to the bottom cover 6. Here, a rubber cap 15 is provided at the end of the first valve core 2 near the first air port 9. The rubber cap 15 is used to improve the sealing performance of the first valve core 2 to the first air port 9 and avoid air leakage. Furthermore, the cross-sectional area of ​​the rubber cap 15 is larger than the cross-sectional area of ​​the first air port 9 to ensure the reliability of the rubber cap 15.

[0035] The first sealing element 10 is located on the bottom cover 6 near the first air port 9; one end of the first sealing element 10 is connected to the bottom cover 6, and the other end is engaged with the side wall of the first valve core 2; wherein, as shown in the figure Figure 6 As shown, the specific structure of the first sealing element 10 is, for example, a flat gasket and a raised structure connected to the flat gasket. The raised structure is an annular umbrella-shaped structure extending away from the bottom cover 6. The end of the raised structure away from the bottom cover 6 is fitted onto the first valve core 2. Furthermore, the side wall of the first valve core 2 is provided with an annular groove, and the end of the raised structure away from the bottom cover 6 is provided with an annular protrusion, which cooperates with the annular groove to connect the raised structure and the first valve core 2. When the first valve core 2 moves, the end of the raised structure away from the bottom cover 6 will not have relative displacement with the first valve core 2, ensuring the airtightness between the end of the raised structure away from the bottom cover 6 and the first valve core 2. Here, the type of the first sealing element 10 is, for example, a rubber structure with deformation capability. By providing the first sealing element 10 with the raised structure, the gas in the accommodating space 8 will not leak out of the accommodating space 8 through the gap formed when the first valve core 2 passes through the bottom cover 6, ensuring the airtightness of the accommodating space 8. Specifically, when the first valve core 2 is subjected to external tension, the first valve core 2 moves in a direction relatively away from the first air port 9, and the protruding structure deforms. At this time, the first air port 9 and the receiving space 8 are connected. When the first valve core 2 loses external tension, the deformation force of the protruding structure drives the first valve core 2 to reset, so as to block the first air port 9. At this time, the first air port 9 and the receiving space 8 are disconnected.

[0036] A first elastic element 11 is sleeved on the first valve core 2, and a first sealing element 10 is located between the first elastic element 11 and the first valve core 2. The end of the first elastic element 11 near the first air port 9 abuts against the first valve core 2, and the end away from the first air port 9 abuts against the bottom cover 6. When the first valve core 2 is subjected to external tension, the first elastic element 11 deforms; when the first valve core 2 loses external tension, the first elastic element 11 assists the first valve core 2 in quickly returning to its natural state. Here, the type of the first elastic element 11 is, for example, a spring.

[0037] In addition, the installation chamber is also provided with a venting chamber 12 corresponding to the first venting port 24, and the venting chamber 12 is connected to the first venting port 24; the venting chamber 12 is provided with a venting hole 13 that is connected to the installation chamber.

[0038] Taking the first valve group including a first valve body structure as an example, a first air port 9 forms a first vent 24, which is used to discharge the gas in the accommodating space 8 to the outside of the accommodating space 8. Another first air port forms an air inlet, which is used to connect with the gas source. The first vent 25 is connected to the accommodating space 8 and is used to connect with the gas-using component. When the first valve core 2 corresponding to the first vent 24 is subjected to external tension, and the first valve core 2 corresponding to the air inlet is not subjected to external tension, the first valve core 2 corresponding to the first vent 24 moves, the first vent 24 is connected to the accommodating space 8, and the first valve core 2 corresponding to the air inlet blocks the air inlet. The gas in the gas-using component enters the accommodating space 8 through the first vent 25, and is discharged through the vent chamber 12 and the first vent 24. At this time, the first valve body structure forms a venting state and performs a venting operation on the gas-using component. When the first valve core 2 at the air inlet is subjected to external tension, and the first valve core 2 corresponding to the first vent 24 is not subjected to external tension, the first valve core 2 corresponding to the air inlet moves, connecting the air inlet and the receiving space 8. The first valve core 2 corresponding to the first vent 24 blocks the first vent 24. The gas supplied by the gas source enters the receiving space 8 through the air inlet, and then enters the gas-using component through the first vent 25. At this time, the first valve group forms an inflation state, performing an inflation operation on the gas-using component. When a certain amount of gas has been filled into the gas-using component, and neither of the two first valve cores 2 is subjected to external force, both the air inlet and the first vent 24 are blocked by the first valve core 2, allowing the gas-using component to be in a pressure-holding state. That is, this first valve group forms a valve group structure with lumbar support function.

[0039] like Figure 7 As shown, the second valve assembly includes: multiple second valve body structures arranged side by side; the number of second valve body structures is set according to actual needs. Specifically, the second valve body structure includes: The second air port 14 is opened on the outer shell 7 and communicates with the receiving space 8; the second air port 14 forms an air inlet for communicating with an air source. The second vent 26 is connected to the accommodating space 8 and is also connected to the air-using component. The second valve core 3 is disposed within the accommodating space 8. One end of the second valve core 3 corresponds to the second air port 14, and the other end penetrates the bottom cover 6 and is movable relative to the bottom cover 6. Similarly, a rubber cap 15 is provided at the end of the second valve core 3 near the second air port 14. The rubber cap 15 is used to improve the sealing performance of the second valve core 3 to the second air port 14 and prevent air leakage. Furthermore, the cross-sectional area of ​​the rubber cap 15 is larger than the cross-sectional area of ​​the second air port 14 to ensure the reliability of the rubber cap 15. In addition, an air vent groove 22 is provided on the side wall of the second valve core 3.

[0040] The second vent 27 is located on the bottom cover 6; wherein, as shown in the figure Figure 1 As shown, the bottom cover 6 has a groove with the groove opening facing the second valve core 3; a second vent 27 is provided at the bottom of the groove; when the second valve core 3 moves to the side closer to the bottom cover 6, it can block the second vent 27.

[0041] A second elastic element 16 is sleeved on the second valve core 3. The end of the second elastic element 16 near the second air port 14 abuts against the second valve core 3, while the end away from the second air port 14 abuts against the bottom cover 6. When the second valve core 3 is subjected to external tension, the second elastic element 16 deforms; when the second valve core 3 loses external tension, the second elastic element 16 assists the second valve core 3 in quickly returning to its natural state. Here, the type of the second elastic element 16 is, for example, a spring.

[0042] Taking the second valve group as an example, which includes a second valve body structure, i.e., a second valve core 3, the second air port 14 corresponding to the second valve core 3 forms an air inlet. The air nozzle 23 of the air inlet is connected to the air-using component. The air source is connected to the air inlet through the air passage 17. When the second valve core 3 is subjected to external pulling force, the air passage 17 is connected to the accommodating space 8. The gas filled by the air source enters the accommodating space 8 through the second air port 14. Since the second valve core 3 moves towards the bottom cover 6, it blocks the second vent 27 on the bottom cover 6. Therefore, the gas will not leak out from the second vent 27. The gas filled by the air source then enters the air-using component through the second vent. At this time, the second valve group forms an inflation state and performs an inflation operation on the air-using component. When the second valve core 3 loses external tension, the rubber cap 15 seals the second air port 14. The gas in the gas-using component enters the receiving space 8 through the second air vent 26, and then exits through the second air vent 27 via the air vent groove 22. At this time, the second valve assembly is in a venting state, performing a venting operation on the gas-using component. That is, this second valve assembly forms a valve assembly structure with a massage function.

[0043] Specifically, the first and second spaces are respectively provided with air passages 17, and the two air passages 17 are connected by air holes 18.

[0044] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the two ends of the shape memory alloy wire 19 are electrically connected to the circuit board 1 through the connecting terminal 20; a fixed end is formed in the middle of the shape memory alloy wire 19, and the fixed end is connected to the corresponding first valve core 2 or second valve core 3.

[0045] The connection method between the middle part of the shape memory alloy wire 19 and the corresponding valve core is, for example, as follows: Figure 2 and Figure 3 As shown, a hook structure is designed at the end of the corresponding valve core to connect the middle part of the shape memory alloy wire 19 to the hook structure. Alternatively, a through hole is opened on the corresponding valve core, the shape memory alloy wire 19 is passed through the through hole, and then the two ends of the shape memory alloy wire 19 are electrically connected to the circuit board 1.

[0046] Here, one end of the shape memory alloy wire 19 is electrically connected to the positive terminal of the DC power supply, and the other end of the shape memory alloy wire 19 is connected in series with a MOSFET and then connected to the circuit ground terminal. These shape memory alloy wires 19 form a parallel power supply configuration. The circuit board 1 integrates an MCU chip, which can output a pulse width modulation (PWM) signal. The PWM signal is used to control the on / off state of each MOSFET. For example, when the PWM signal is at a high level, it controls each MOSFET to conduct, allowing the circuit board 1 to supply power to the shape memory alloy wire 19, causing the shape memory alloy wire 19 to shrink due to heat. When the PWM signal is at a low level, it controls each MOSFET to turn off, allowing the circuit board 1 to stop supplying power to the shape memory alloy wire 19, thus resetting the shape memory alloy wire 19.

[0047] The end of the shape memory alloy wire 19 is crimped with a metal terminal, which is electrically connected to the circuit board 1.

[0048] In addition, the connection terminals 20 of all shape memory alloy wires 19 are staggered on the circuit board 1. The circuit board 1 can individually control different first valve cores 2 and second valve cores 3.

[0049] When circuit board 1 supplies power to shape memory alloy wire 19, shape memory alloy wire 19 contracts due to heat, applying external tension to the corresponding valve core, thereby connecting the corresponding air port and the receiving space 8; when circuit board 1 stops supplying power to shape memory alloy wire 19, shape memory alloy wire 19 resets, and the corresponding valve core loses external tension, thereby disconnecting the corresponding air port and the receiving space 8.

[0050] That is, by adjusting the power-on and power-off state of the circuit board 1, the shape memory alloy wire 19 applies or releases external tension to the corresponding first valve core 2 and second valve core 3, thereby controlling the first valve group to form an inflation, deflation or pressure holding state, and controlling the second valve group to form an inflation and deflation state.

[0051] Circuit board 1 also integrates a LIN transceiver, which communicates with the MCU chip via the LIN bus. The LIN transceiver receives massage signals from the vehicle's center console. These massage signals carry a target valve core identifier and corresponding execution instructions. The LIN transceiver packages the massage signals into periodic messages and sends them to the MCU chip. The MCU chip parses the periodic messages, obtains the target valve core and corresponding execution instructions, and generates corresponding PWM signals to indicate the on / off state of each MOSFET, thereby controlling the circuit board 1 to energize or de-energize the shape memory wire 19, thus enabling the corresponding valve core to perform inflation or deflation. Here, the LIN transceiver model is, for example, TJA1027 or ATA6625. The target valve core identifier refers to the numerical designation of the valve core according to its installation sequence, such as #01, #02, etc. The execution instruction is the command instructing the valve core to inflate or deflate.

[0052] Furthermore, to ensure the valve core's operational accuracy, the MUC chip in this solution also stores a parameter database in its memory. This database includes at least multiple sets of ambient temperature, power supply voltage, air pressure, and PWM parameters; the PWM parameters include at least the duty cycle and conduction duration. Here, the data in the parameter database is pre-calibrated and stored data.

[0053] The system retrieves the ambient temperature, corresponding power supply voltage, and gas pressure from the parameter database. Based on this data, the device is operated, and the MCU chip generates a PWM signal according to the corresponding duty cycle and conduction time. The PWM signal controls the switching on and off of the MOS transistor, thereby achieving the purpose of inflation, deflation, or pressure holding.

[0054] The specific values ​​in the parameter database shown in Table 1 are for illustrative purposes only and are not intended to limit this solution. For example, using the ambient temperature of 10℃, power supply voltage of 10V, and air pressure of 0.5MPa in Table 1, the device is operated. These operating data correspond to a duty cycle of 55% and a conduction time of 240ms in Table 1. At this time, the MCU chip generates a PWM signal based on a duty cycle of 75% and a conduction time of 240ms, and controls the on / off state of the MOSFET based on this PWM signal.

[0055] Table 1 Parameter Database

[0056] This application designs at least one set of pneumatic control units in the mounting chamber of the housing. Each pneumatic control unit includes adjacent pneumatic control components and a circuit board. The pneumatic control components are designed with a first layer and a second layer, arranged along a first direction and interconnected, for mounting a first valve group and / or a second valve group, respectively. This creates a double-layer arrangement of the first and / or second valve groups within the device. The first valve core 2 of the first valve group and the second valve core 3 of the second valve group are connected to the circuit board 2 via shape memory alloy wires 19. Shape memory alloy wires 19 are connected to both sides of the circuit board 2. The circuit board 2 controls the inflation, deflation, or pressure holding state of the first valve group and the inflation and deflation state of the second valve group. In other words, integrating valve groups with different functions or multiple valve groups performing the same function together results in higher integration of the entire device, maximizing space savings and facilitating product development and design.

[0057] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A pneumatic control device for a layered shape memory alloy, characterized in that, include: A housing, the interior of which is hollow to form an installation chamber; At least one set of pneumatic control units are disposed inside the mounting chamber. The pneumatic control units include a circuit board (1) and a pneumatic control assembly. The pneumatic control assembly is disposed adjacent to the circuit board (1). The pneumatic control assembly has a first layer space and a second layer space arranged side by side and interconnected along a first direction, the first direction being perpendicular to the circuit board (1). The pneumatic control assembly includes a first valve group and a second valve group. The first valve group is disposed in the first layer space and / or the second layer space, and the second valve group is disposed in the first layer space and / or the second layer space. The first valve group has a plurality of first valve cores (2), and the second valve group has at least one second valve core (3). The first valve core (2) and the second valve core (3) are connected to the circuit board (1) through a shape memory alloy wire (19). The shape memory alloy wire (19) is connected to both sides of the circuit board (1). By adjusting the power-on / off state of the circuit board (1), the shape memory wire (19) applies or releases external tension to the corresponding first valve core (2) and second valve core (3), thereby controlling the first valve group to form an inflation, deflation or pressure holding state, and controlling the second valve group to form an inflation or deflation state.

2. The pneumatic control device for a layered shape memory alloy according to claim 1, characterized in that, The housing includes an upper shell (4) and a lower shell (5), which are connected to form the mounting chamber.

3. The pneumatic control device for a layered shape memory alloy according to claim 2, characterized in that, The pneumatic control unit also includes: A bottom cover (6) is provided with an outer shell (7); an accommodating space (8) is formed between the bottom cover (6) and the outer shell (7); The portion of the accommodating space (8) near the upper shell (4) forms the first layer of space, and the portion of the accommodating space (8) near the lower shell (5) forms the second layer of space; Alternatively, the portion of the accommodating space (8) near the upper shell (4) forms the second layer space, and the portion of the accommodating space (8) near the lower shell (5) forms the first layer space.

4. The pneumatic control device for a layered structure shape memory alloy according to claim 3, characterized in that, The first valve assembly includes: a plurality of first valve body structures arranged side by side; The first valve body structure includes: Two first air ports (9) are provided on the outer shell (7). The first air ports (9) are connected to the accommodating space (8). One of the first air ports (9) forms a first vent (24) for discharging the gas in the accommodating space (8) to the outside of the accommodating space (8). The other first air port (9) forms an air inlet for connecting with a gas source. The first vent (25) is connected to the receiving space (8) and is used to connect to the ventilation component; The first valve core (2) is disposed in the accommodating space (8); one end of the first valve core (2) is disposed corresponding to the first air port (9), and the other end passes through the bottom cover (6) and can move relative to the bottom cover (6); The first sealing element (10) is located on the bottom cover (6) near the first air port (9); one end of the first sealing element (10) is connected to the bottom cover (6), and the other end is engaged with the side wall of the first valve core (2); The first elastic element (11) is sleeved on the first valve core (2), and the first seal (10) is located between the first elastic element (11) and the first valve core (2).

5. The pneumatic control device for a layered shape memory alloy according to claim 4, characterized in that, The installation chamber is also provided with a venting chamber (12) corresponding to the first vent (24), and the venting chamber (12) is connected to the first vent (24); the venting chamber (12) is provided with a vent hole (13) connected to the installation chamber.

6. The pneumatic control device for a layered shape memory alloy according to claim 4, characterized in that, The second valve assembly includes: a plurality of second valve body structures arranged side by side; The second valve body structure includes: The second air port (14) is opened on the outer shell (7) and communicates with the receiving space (8); the second air port (14) forms an air inlet for communicating with an air source; The second vent (26) is connected to the accommodating space (8) and the second vent (26) is connected to the gas-using component; The second valve core (3) is disposed in the accommodating space (8); one end of the second valve core (3) is correspondingly disposed with the second air port (14), and the other end passes through the bottom cover (6) and can move relative to the bottom cover (6); The second vent (27) is located on the bottom cover (6); The second elastic element (16) is sleeved on the second valve core (3).

7. The pneumatic control device for a layered shape memory alloy according to claim 6, characterized in that, The first layer space and the second layer space are respectively provided with air passages (17), and the two air passages (17) are connected by air holes (18).

8. The pneumatic control device for a layered shape memory alloy according to claim 6, characterized in that, The bottom cover (6) has a groove, the opening of which faces the second valve core (3); a second vent (27) is provided at the bottom of the groove. When the second valve core (3) moves toward the side closer to the bottom cover (6), it can block the second vent (27).

9. A pneumatic control device for a layered shape memory alloy according to claim 1, characterized in that, The two ends of the memory alloy wire (19) are electrically connected to the circuit board (1) through the connecting terminal (20); a fixed end is formed in the middle of the memory alloy wire (19), and the fixed end is connected to the corresponding first valve core (2) or second valve core (3).

10. A pneumatic control device for a layered shape memory alloy according to claim 9, characterized in that, The connection terminals (20) of all the memory alloy wires (19) are staggered on the circuit board (1).

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