Double-valve-element vent valve based on memory alloy driving

Abstract

The invention relates to the technical field of vent valves, in particular to a memory alloy driving-based double-valve-element vent valve which comprises a shell and a bottom cover, two groups of memory alloy actuators are mounted on the bottom cover, and each group of memory alloy actuators comprises a valve element, a driving rod, a clamping terminal, a memory alloy driving wire and a reset spring; the shell covers the two groups of memory alloy actuators, the shell and the bottom cover are assembled into a sealing body, the driving rod comprises a movable push rod and a memory alloy driving wire mounting part, the movable push rod is arranged at the front end of the memory alloy driving wire mounting part, and the memory alloy driving wire is embedded into the memory alloy driving wire mounting part; the bottom of the driving rod is provided with a cavity for installing the reset spring, and the two ends of the reset spring are connected with the inner wall of the cavity in the driving rod. According to the invention, the space structure is compact, and the single valve body can realize the functions of inflating, deflating and pressure maintaining of the air bag by two original valve bodies, so that the valve body is more favorable for being used as a waist support and a massage air valve of a high-grade automobile.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation valves, and in particular to a dual-valve core ventilation valve driven by a memory alloy. Background Art

[0002] The sitting comfort of high-end car seats is closely related to the massage function on the car seats. The massage function of the car seats is realized by the air vent in the car seat. The air vent realizes the lumbar support or massage function by arranging it in different positions on the car seat. The lumbar support function requires two air vent modules to realize inflation and deflation respectively. Two air vent modules control one airbag, which requires a large space. In the application scenario with high space utilization requirements and compact space like cars, the traditional air vent module occupies a large volume and is not advantageous to use. In addition, the traditional use of solenoid valves is suitable for copper coils to drive the air valve to work. In order to achieve a better driving effect, the number of copper coils is required to be sufficient, which wastes materials, resulting in large product size and weight, and difficulty in reducing the volume. Furthermore, the existing products driven by memory alloys will affect the temperature of the memory alloy wire itself when the power is turned on due to the external cold and hot air flowing through the memory alloy drive mechanism, resulting in incomplete phase change of the wire during the passing process, causing the movement distance of the memory alloy drive mechanism to be different from the designed distance, and the air tightness cannot be guaranteed.

[0003] Therefore, there is an urgent need for a vent valve with a new structure, which can not only meet the compact space requirements of automobile seats but also reduce or isolate the influence of air on the power-on temperature of the memory alloy. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a dual-valve core ventilation valve driven by a memory alloy, which has a compact spatial structure and a single valve body can realize the original functions of two valve bodies for inflating, deflating and maintaining pressure on the airbag, which is more conducive to use as a lumbar support and massage air valve for high-end cars.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: providing a dual valve core vent valve based on memory alloy drive, comprising a housing and a bottom cover, wherein two groups of memory alloy actuators are installed on the bottom cover, each group of memory alloy actuators comprises a valve core, a drive rod, a clamping terminal, a memory alloy drive wire and a reset spring, and the housing covers the two groups of memory alloy actuators and is assembled with the bottom cover to form a sealed body;

[0006] The front end of the shell is provided with an inflation port and a main air channel, the inflation port and the main air channel are not connected to each other, the two valve cores are respectively placed in the first valve chamber and the second valve chamber, the inflation port is connected to the first valve chamber and the second valve chamber, the first air chamber and the second air chamber are correspondingly arranged above the first valve chamber and the second valve chamber, and the main air channel is connected to the first air chamber and the second air chamber; the two valve cores are defined as the first valve core and the second valve core, the first valve core controls the sealing or circulation of the gas between the first air chamber and the first valve chamber by moving up and down, and the second valve core controls the sealing or circulation of the gas between the second air chamber and the second valve chamber by moving up and down; the upper surface of the shell is provided with an air release port connected to the second air chamber;

[0007] The driving rod includes a movable push rod and a memory alloy driving wire mounting portion, the movable push rod is arranged at the front end of the memory alloy driving wire mounting portion, and the memory alloy driving wire is embedded in the memory alloy driving wire mounting portion; a cavity for installing the reset spring is provided at the bottom of the driving rod, and both ends of the reset spring are connected to the inner wall of the cavity on the driving rod.

[0008] The tail end of the memory alloy driving wire is clamped and fixed by the clamping terminal, and the clamping terminal is fixedly mounted on the end of the bottom cover;

[0009] The valve core is arranged at the front end of the movable push rod, and a notch is provided on one side of the valve core close to the movable push rod, which is at an angle of 30 to 60 degrees with the horizontal plane. The movable push rod includes a first rod body and a second rod body, the first rod body is connected to the memory alloy drive wire mounting portion, the second rod body is vertically connected to the first rod body on the same horizontal plane, and the second rod body extends into the notch;

[0010] When the memory alloy driving wire is energized to drive the driving rod to move horizontally forward and backward, the second rod body also moves horizontally forward and backward in the slot. The second rod body is in contact with the slot, and the horizontal forward and backward movement of the second rod body in the slot is converted into the up and down movement of the valve core.

[0011] Furthermore, a top cover is provided on the shell for conveniently placing a sound-absorbing sponge in the shell. The top cover and the shell are assembled by any one of gluing, snap-fitting or ultrasonic welding. The sound-absorbing sponge is arranged in the second air chamber.

[0012] Furthermore, a notch which forms an angle of 45° with the horizontal plane is provided on one side of the valve core close to the movable push rod.

[0013] Furthermore, the memory alloy drive wire is a U-shaped wire, and the memory alloy drive wire mounting portion includes a boss adapted to the width of the U-shaped wire and having a U-shaped outer contour, the U-shaped wire is wound on the boss, and the two tail ends of the U-shaped wire are respectively fixed by separate clamping terminals.

[0014] Furthermore, the length of the memory alloy driving wire is 30 mm.

[0015] Furthermore, the shell and the bottom cover are assembled by any one of glue dispensing, snap-fitting or ultrasonic welding.

[0016] Furthermore, a first partition wall is provided on the bottom cover, and a second partition wall is provided at a corresponding position of the shell, and semicircular concave surfaces are provided on the first partition wall and the second partition wall. When the shell and the bottom cover are assembled into a sealed body, the respective semicircular concave surfaces on the first partition wall and the second partition wall just form a whole circle for the second rod body to pass through, and the first partition wall and the second partition wall are arranged on a side of the valve core close to the movable push rod, and the side surface of the valve core close to the movable push rod is in contact with the side surfaces of the first partition wall and the second partition wall.

[0017] Furthermore, a groove for placing a sealing O-ring is provided on the upper surface of the valve core, and the sealing O-ring is embedded in the groove.

[0018] Furthermore, the clamping terminal includes a clamping part, a main body and a pin connected in sequence from top to bottom, the main body is 0.3 mm thick, the middle gap formed by bending the clamping part is used to crimp the memory alloy drive wire, the thickness of the clamping part is 0.1-0.2 mm, and the pin is used to plug into the PCB board for conduction; four pin slots are provided on the bottom cover, and the pin is plugged into the PCB board after being inserted into the pin slot.

[0019] Furthermore, a guide column is provided on the upper surface of the bottom cover, and a guide groove adapted to the guide column is provided at the bottom of the memory alloy drive wire mounting portion, and the return spring is arranged in the cavity of the guide groove, and one end of the return spring is connected to the front end surface of the guide column, and the other end is connected to the inner wall of the cavity of the guide groove.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The vent valve of the embodiment of the present invention can be used in a compact space, and a single vent valve can replace the functions of two vent valves.

[0022] 2. Compared with the traditional solenoid valve which requires a large number of copper coils, the vent valve of the embodiment of the present invention only requires a memory alloy wire of about 30 mm, which greatly saves materials, reduces volume and reduces weight.

[0023] 3. The cavity structure inside the shell of the embodiment of the present invention is reasonably designed and has good air tightness. The working environment of the memory alloy drive wire is little affected by the low-temperature flowing air, ensuring that the movement distance of the memory alloy drive wire can meet the use requirements.

[0024] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0025] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are not drawn to scale according to actual reference objects. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the accompanying drawings, in which:

[0027] Figure 1 It is a schematic diagram of the external structure of the dual-valve core ventilation valve driven by the memory alloy of the present invention.

[0028] Figure 2 It is an exploded view of the dual-valve core vent valve driven by memory alloy according to the present invention.

[0029] Figure 3 The figure is a schematic diagram of the valve core structure of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0030] Figure 4 The figure is a schematic diagram of the driving rod structure of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0031] Figure 5 The present invention is a schematic diagram of the bottom cover structure of a dual-valve core ventilation valve driven by a memory alloy.

[0032] Figure 6 The figure is a schematic diagram of the internal structure of the housing of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0033] Figure 7 It is a side sectional view of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0034] Figure 8 It is a schematic diagram of the overall internal structure of the dual-valve core ventilation valve driven by the memory alloy of the present invention.

[0035] Fig. 9 This is a top view of the memory alloy-driven dual-valve core vent valve of the present invention with the top cover removed.

[0036] Fig.10 It is a schematic structural diagram of the first valve chamber and the second valve chamber of the dual valve core ventilation valve driven by the memory alloy according to the present invention.

[0037] Fig.11 This is a diagram of the power-on state of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0038] Fig.12 This is a diagram of the power-off state of the dual-valve core ventilation valve driven by the memory alloy according to the present invention.

[0039] Description of Figure Numbers:

[0040] 1-shell; 2-bottom cover; 3-main airway; 4-inflation port; 5-top cover; 6-deflation port; 7-silencer sponge; 8-memory alloy drive wire; 9-clamping terminal; 10-sealing O-ring; 11-drive rod; 12-reset spring; 13-valve core; 1101-second rod body; 1102-first rod body; 1103-mounting part base; 1104-mounting part upper seat; 1301-slot; 1302-circular groove; 1303-vertical notch; 2001-first partition wall; 2002-guide column; 2003-pin slot; A1-first air chamber; A2-second air chamber; B1-first valve chamber; B2-second valve chamber; T1-first ventilation notch; T2-second ventilation notch. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meaning understood by people with general skills in the field to which the present invention belongs.

[0042] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The vent valve can realize the lumbar support or massage function by arranging it in different positions on the car seat. The lumbar support function requires two vent valve modules to realize inflation and deflation respectively. Two vent valve modules control one airbag, which requires a large space. In the application scenario with high space utilization and compact space like automobiles, the traditional vent valve module occupies a large volume and is not advantageous to use. In addition, the traditional use of solenoid valves is suitable for copper coils to drive the air valve to work. In order to achieve a better driving effect, the number of copper coils is required to be sufficient, which wastes materials, resulting in large product size and weight, and difficulty in reducing the volume. Furthermore, the existing products driven by memory alloys will affect the temperature of the memory alloy wire itself when the power is turned on due to the external cold and hot air flowing through the memory alloy drive mechanism, resulting in incomplete phase change of the wire during the passing process, causing the movement distance of the memory alloy drive mechanism to be different from the designed distance, and the air tightness cannot be guaranteed.

[0044] Based on the above problems, an embodiment of the present invention provides a dual-valve core ventilation valve driven by a memory alloy, which has a small size and a compact structure. A single valve can achieve the functions that originally required two valves, has strong air tightness, and a better working environment for the memory alloy wire.

[0045] See also Figures 1 to 12 As shown, the embodiment of the present invention provides a dual valve core vent valve based on memory alloy drive, comprising a housing 1 and a bottom cover 2, two groups of memory alloy actuators are installed on the bottom cover 2, each group of memory alloy actuators comprises a valve core 13, a drive rod 11, a clamping terminal 9, a memory alloy drive wire 8 and a reset spring 12, the housing 1 covers the two groups of memory alloy actuators and is assembled with the bottom cover 2 to form a sealed body;

[0046] The two valve cores 13 are defined as a first valve core and a second valve core, respectively. The chamber where the first valve core is located is a first valve chamber B1, and the chamber where the second valve core is located is a second valve chamber B2. A first air chamber A1 is correspondingly arranged directly below the first valve chamber B1, and a second air chamber A2 is correspondingly arranged directly below the second valve chamber B2. A first through hole is arranged between the first air chamber A1 and the first valve chamber B1, and a second through hole is arranged between the second air chamber A2 and the second valve chamber B2. The first through hole is opposite to the upper surface of the first valve core, and the second through hole is opposite to the upper surface of the second valve core.

[0047] The front end of the shell 1 is provided with an inflation port 4 and a main air channel 3, the inflation port 4 and the main air channel 3 are not connected to each other, the two valve cores are respectively placed in the first valve chamber B1 and the second valve chamber B2, the inflation port 4 connects the first valve chamber B1 and the second valve chamber B2, the first air chamber A1 and the second air chamber A2 are correspondingly arranged above the first valve chamber B1 and the second valve chamber B2, and the main air channel 3 connects the first air chamber A1 and the second air chamber A2; the first valve core controls the sealing or circulation of gas between the first air chamber A1 and the first valve chamber B1 by moving up and down, and the second valve core controls the sealing or circulation of gas between the second air chamber A2 and the second valve chamber B2 by moving up and down; specifically, when the first valve core moves upward, the first through hole is blocked to block the gas circulation between the first valve chamber B1 and the first air chamber A1; similarly, when the second valve core moves upward, the second through hole is blocked to block the gas circulation between the second valve chamber B2 and the second air chamber A2.

[0048] The upper surface of the shell 1 is provided with an air vent 6 connected to the second air chamber A2; the first air chamber A1 and the second air chamber A2 are respectively provided with a first ventilation notch T1 and a second ventilation notch T2 at the positions where they are connected to the main air channel 3.

[0049] See also Figure 4 As shown, the driving rod 11 includes a movable push rod and a memory alloy driving wire 8 mounting portion, the memory alloy driving wire 8 mounting portion includes a mounting portion base 1103 and a mounting portion upper seat 1104, the outer contour of the mounting portion upper seat 1104 is the same as the shape of the memory alloy driving wire 8, the movable push rod is arranged at the front end of the memory alloy driving wire 8 mounting portion, and the memory alloy driving wire 8 is embedded in the mounting portion upper seat 1104; the bottom of the mounting portion base 1103 is provided with a cavity for installing the reset spring 12.

[0050] The tail end of the memory alloy driving wire 8 is clamped and fixed by the clamping terminal 9, and the clamping terminal 9 is fixedly mounted at the end of the bottom cover 2;

[0051] The valve core is arranged at the front end of the movable push rod, and a slot 1301 with an angle of 30 to 60 degrees to the horizontal plane is provided on the side of the valve core close to the movable push rod. The movable push rod includes a first rod body 1102 and a second rod body 1101. The first rod body 1102 is connected to the mounting portion of the memory alloy drive wire 8, and the second rod body 1101 is vertically connected to the first rod body 1102 on the same horizontal plane, and the second rod body 1101 extends into the slot 1301; a vertical notch 1303 for the first rod body 1102 to extend into is provided on the side of the slot 1301 close to the movable push rod.

[0052] When the memory alloy drive wire 8 is energized and drives the drive rod 11 to move horizontally forward and backward, that is, the second rod body 1101 also moves horizontally forward and backward in the slot 1301, and the second rod body 1101 is in contact with the slot 1301, and the horizontal forward and backward movement of the second rod body 1101 in the slot 1301 is converted into the up and down movement of the valve core. Compared with the valve core also moving forward and backward along the displacement direction of the memory alloy drive wire, this conversion method can further reduce the length of the vent valve in the horizontal direction, further reduce the volume of the vent valve, and achieve the purpose of miniaturization.

[0053] In some embodiments of the present invention, the upper surfaces of the first valve core and the second valve core are both provided with a circular groove 1302 for fixing the sealing O-ring 10, and correspondingly, a raised crater is provided directly below the first through hole and the second through hole. When the first valve core and the second valve core move upward to block the first through hole and the second through hole respectively, the raised crater is in close contact with the sealing O-ring 10, further enhancing the air tightness.

[0054] In some embodiments of the present invention, a top cover 5 is provided on the shell 1 for conveniently placing a sound-absorbing sponge 7 in the shell 1. The top cover 5 and the shell 1 are assembled by any one of gluing, snap-fitting or ultrasonic welding to achieve a beautiful appearance without obvious adhesive seams or lines on the surface of the shell 1.

[0055] The muffler sponge 7 is arranged in the second air chamber A2, and the air vent 6 is arranged on the top cover 5, and the air vent 6 is connected to the second air chamber A2. The muffler sponge 7 can reduce the whistling sound generated during exhaust and reduce the noise generated when the vent valve is used.

[0056] In some embodiments of the present invention, a notch 1301 is provided on one side of the valve core close to the movable push rod, and the opening direction of the notch 1301 is inclined upward. The inclination angle of 45° is selected because the actuation force value of the valve core is optimal at this inclination angle. Relevant experimental data are shown in Tables 1 and 2.

[0057] Table 1 is a table of experimental data related to the movement of the valve core at different inclination angles of the notch 1301 when the deformation of the memory alloy driving wire 8 remains unchanged at 1 mm after power is turned on and the output force value is 2N.

[0058] Table 1

[0059]

[0060]

[0061] Table 2 is a table of relevant experimental data of the memory alloy drive wire 8 at different notch 1301 inclination angles when the memory alloy drive wire 8 maintains a valve core displacement of 0.5 mm after power is turned on and the memory alloy drive wire 8 outputs a force value of 2N.

[0062] Table 2

[0063]

[0064] Combining the experimental data of Table 1 and Table 2, it can be known that the valve core operating force value reaches the maximum when the notch 1301 is designed to be inclined at an angle of 45° to the horizontal plane. As the inclination angle of the notch 1301 of the valve core increases, the maximum static friction force that the valve core can overcome also increases, but the efficiency of the output force value decreases. If the displacement of the valve core is maintained at 0.5mm, the required length of the memory alloy drive wire 8 increases with the increase of the angle. The increase in the length of the wire will cause the volume of the vent valve to increase, and the size is not advantageous. When it is applied to a car seat as a lumbar support and massage module, the space is not compact enough. In summary, combined with the pros and cons of various aspects, the inclination angle of the notch 1301 is preferably designed to be 30°, 45° or 60°. According to different application scenarios, for massage seats with high requirements for compact space, it can be preferably designed to be 45°, which meets the needs of small size and large flow ventilation.

[0065] In some embodiments of the present invention, the contact surface between the second rod 1101 and the inside of the slot 1301 may be made of a self-lubricating material, such as Teflon, PBT, ABS, etc.

[0066] In some embodiments of the present invention, the memory alloy drive wire 8 is a U-shaped wire, and the mounting portion of the memory alloy drive wire 8 includes a boss adapted to the width of the U-shaped wire and having a U-shaped outer contour, the U-shaped wire is wound on the boss, and the two tail ends of the U-shaped wire are respectively fixed by separate clamping terminals 9.

[0067] In some embodiments of the present invention, the length of the memory alloy drive wire 8 is 30 mm. Under the condition of ensuring the output displacement, force value, and life, a 3% strain of the total length of the memory alloy drive wire 8 is usually used as the working stroke of the memory alloy drive wire 8. At this length, the displacement that can be generated by the U-shaped wire is about 30 / 2*3%=0.5 mm, which can ensure the gas flow rate and also ensure that there will not be too much noise. In addition, after the 30 mm long memory alloy drive wire 8 becomes a U-shaped structure, the overall layout of the vent valve is compact, which meets the miniaturized design.

[0068] In some embodiments of the present invention, the housing 1 and the bottom cover 2 are assembled by any one of glue dispensing, snap-fitting or ultrasonic welding.

[0069] In some embodiments of the present invention, a first partition wall 2001 is provided on the bottom cover 2, and a second partition wall is provided at a corresponding position of the shell 1, and both the first partition wall 2001 and the second partition wall are provided with semicircular concave surfaces. When the shell 1 and the bottom cover 2 are assembled into a sealed body, the respective semicircular concave surfaces on the first partition wall 2001 and the second partition wall just form a whole circle for the second rod body 1101 to pass through, and the first partition wall 2001 and the second partition wall are arranged on the side of the valve core close to the movable push rod, and the side surface of the valve core close to the movable push rod is in contact with the side surfaces of the first partition wall 2001 and the second partition wall.

[0070] By setting a first partition wall 2001 on the bottom cover 2 and a second partition wall at a corresponding position of the shell 1, the semicircular concave surfaces on the first partition wall 2001 and the second partition wall just form a whole circle for the second rod body 1101 to pass through, so that the first valve chamber B1 and the chamber where the driving rod 11 behind the first valve chamber B1 is located are blocked, and the second valve chamber B2 and the chamber where the driving rod 11 behind the second valve chamber B2 is located are also blocked, so that the memory alloy driving wire 8 located on the mounting part of the memory alloy driving wire 8 can be in an independent cavity, reducing contact with flowing air.

[0071] When the memory alloy drive wire 8 is in contact with the flowing air, the heat accumulated on the memory alloy drive wire 8 after power is turned on will be partially taken away by the low-temperature gas, which will affect the original deformation response speed of the memory alloy drive wire 8 and prolong the response time. The memory alloy drive wire 8 in the embodiment of the present invention can be in an independent cavity, which to a certain extent guarantees the heat generated by the current on the memory alloy drive wire 8 and prevents heat loss. Therefore, in a low-temperature environment, the vent valve of the embodiment of the present invention has a fast response speed, which expands the application range of the vent valve in a low-temperature environment. The response speed comparison of the vent valve of the embodiment of the present invention and the existing vent valves on the market is shown in Table 3.

[0072] Table 3 is the comparison data of the response speed of different vent valves at different ambient temperatures

[0073] Temperature ℃ Ventilation valves already available on the market Ventilation valve according to an embodiment of the present invention -20 563ms 343ms 0 487ms 283ms Room temperature 254ms 257ms 40 193ms 197ms 60 154ms (leakage occurs) 161ms

[0074] The existing memory alloy wire on the market has a martensitic phase transformation end temperature Mf of 43°C during cooling. Therefore, at 60°C, the complete phase transformation cannot be completed, resulting in the valve core 13 failing to completely close the vent when the temperature drops to 60°C. The wire of this solution selects high-temperature wire with a martensitic phase transformation end temperature of more than 75°C, ensuring that it can still work stably when the temperature drops to 60°C, blocking the valve port, with a good sealing effect and no leakage.

[0075] In some embodiments of the present invention, the clamping terminal 9 includes a clamping part, a main body and a pin connected in sequence from top to bottom, the main body has a thickness of 0.3 mm, the middle gap formed by bending the clamping part is used to crimp the memory alloy driving wire 8, and the thickness of the clamping part is 0.1 to 0.2 mm. This thickness can reduce the crimping force during bending and improve the efficiency of crimping wires.

[0076] The pins are used to plug into the PCB board for electrical conduction; four pin slots 2003 are provided on the bottom cover 2, and the pins are inserted into the pin slots 2003 and then plugged into the PCB board, thereby strengthening the fixation of the clamping terminal 9.

[0077] In some embodiments of the present invention, a guide column 2002 is provided on the upper surface of the bottom cover 2, a guide groove adapted to the guide column 2002 is provided at the bottom of the memory alloy drive wire 8 mounting portion, and the reset spring 12 is arranged in the cavity of the guide groove, and one end of the reset spring 12 is connected to the front end surface of the guide column 2002, and the other end is connected to the inner wall of the cavity of the guide groove. Through the cooperation of the guide column 2002 and the guide groove, the stability of the drive rod 11 when moving forward and backward is further improved, and no deviation will occur. The position where the reset spring 12 is arranged makes full use of the space of the guide groove at the bottom of the memory alloy drive wire 8 mounting portion, and the structure is compact, and the length of the vent valve will not be extended additionally.

[0078] Working principle of the embodiment of the present invention: The present invention utilizes the property that the memory alloy drive wire 8 contracts and deforms when heated after being energized, driving the drive rod 11 to move backward, thereby causing the valve core to move downward to achieve ventilation. Specifically, since a double valve core is arranged in a valve body of the present invention, the first valve core and the second valve core are respectively actuated, and the three states of the airbag can be switched in the same valve body. The external airbag is sealed and connected to the inflation port 4 in the embodiment of the present invention.

[0079] When the airbag is pressurized, the main airway 3 is ventilated, the memory alloy driving wire 8 driving the first valve core and the memory alloy driving wire 8 driving the second valve core are both powered off, and the memory alloy driving wire 8 returns to its initial shape. The combined force of the memory alloy driving wire 8 and the reset spring 12 in the initial shape causes the movable push rod to move forward, and the second rod body 1101 of the movable push rod is arranged in the notches 1301 of the first valve core and the second valve core, and the opening of the notch 1301 is arranged obliquely upward, and the optimal angle between the opening direction of the notch 1301 and the horizontal direction is 45°. When the second rod body 1101 moves forward, it pushes the first valve core and the second valve core to move upward by contacting the inner wall of the notch 1301. After the first valve core and the second valve core move upward for a certain distance, the sealing O-rings 10 fixed on the upper surfaces of the first valve core and the second valve core are respectively in contact with the first through hole and the second through hole. The crater directly below is in close contact, so that the only gas flow port between the first air chamber A1 and the first valve chamber B1 is blocked. Similarly, the only gas flow port between the second air chamber A2 and the second valve chamber B2 is also blocked. Although the airflow from the main airway 3 always enters the first air chamber A1 and the second air chamber A2 through the first ventilation gap T1 and the second ventilation gap T2, the first air chamber A1 and the first valve chamber B1 are not connected, and the second air chamber A2 and the second valve chamber B2 are not connected. The inflation port 4 connects the first valve chamber B1 and the second valve chamber B2, and the external airbag is connected to the inflation port 4, so the airbag will not be inflated. At this time, the deflation port 6 connected to the second air chamber A2 is also closed. Although part of the gas inside the airbag will flow back to the first valve chamber B1 and the second valve chamber B2, the airbag will not be deflated, so the airbag can achieve a pressure-maintaining state.

[0080] When the airbag is inflated, the main airway 3 is ventilated, the memory alloy driving wire 8 that drives the first valve core is energized, and the memory alloy driving wire 8 that drives the second valve core is de-energized. Since the memory alloy driving wire 8 has the characteristic of contracting after being energized, the combined force of the contraction force generated by the memory alloy driving wire 8 that drives the first valve core and the force generated by the corresponding return spring 12 causes the movable push rod to move backward, and the second rod body 1101 of the movable push rod is arranged in the groove 1301 of the first valve core. While the second rod body 1101 moves backward, it moves backward along the inner wall of the groove 1301, so that the first valve core falls and moves away from the first through hole, so that the gas flow port between the first valve chamber B1 and the first air chamber A1 changes from being blocked to being unblocked. At the same time, since the memory alloy driving wire 8 that drives the second valve core is de-energized, the memory alloy driving wire 8 that drives the second valve core The memory alloy driving wire 8 returns to its initial shape, and the combined force of the memory alloy driving wire 8 and the reset spring 12 in the initial shape causes the movable push rod to move forward. While the second rod body 1101 moves forward, it pushes the second valve core to move upward by abutting against the inner wall of the groove 1301. After the second valve core moves upward for a certain distance, the sealing O-ring 10 fixed on the upper surface of the second valve core is in close contact with the crater directly below the second through hole, and the gas flow port between the second air chamber A2 and the second valve chamber B2 is blocked, and the vent 6 connected to the second air chamber A2 is closed. The airbag cannot be deflated through the second valve chamber B2, while the airflow from the main airway 3 can flow to the first valve chamber B1 through the first air chamber A1, and then flow to the airbag from the first valve chamber B1, thereby achieving inflation of the airbag.

[0081] When the airbag is deflated, the main airway 3 is ventilated, the memory alloy driving wire 8 that drives the first valve core is powered off, and the memory alloy driving wire 8 that drives the second valve core is powered on. Since the memory alloy driving wire 8 has the characteristic of contracting after being powered on, the combined force of the contraction force generated by the memory alloy driving wire 8 that drives the second valve core and the force generated by the corresponding return spring 12 causes the movable push rod to move backward. The second rod body 1101 of the movable push rod is arranged in the notch 1301 of the second valve core. When the second rod body 1101 moves backward, it moves backward along the inner wall of the notch 1301, so that the second valve core falls and moves away from the second through hole, so that the gas flow port between the second valve chamber B2 and the second air chamber A2 changes from being blocked to being unblocked. At the same time, since the memory alloy driving wire 8 that drives the first valve core is powered off, the memory alloy driving wire 8 that drives the first valve core The driving wire 8 returns to its initial shape, and the combined force of the memory alloy driving wire 8 and the return spring 12 in the initial shape causes the movable push rod to move forward. While the second rod body 1101 moves forward, it pushes the first valve core to move upward by contacting the inner wall of the groove 1301. After the first valve core moves upward for a certain distance, the sealing O-ring 10 fixed on the upper surface of the first valve core is in close contact with the crater directly below the first through hole, and the gas flow port between the first air chamber A1 and the first valve chamber B1 is blocked. The airflow from the main airway 3 cannot pass through the first air chamber A1 into the first valve chamber B1 to inflate the airbag. At this time, the air release port 6 connected to the second valve chamber B2 is punched, and the gas inside the airbag flows back to the second air chamber A2 and the second valve chamber B2, and flows out from the air release port 6, thereby achieving air release of the airbag.

[0082] In summary, the vent valve of the embodiment of the present invention can be used in a compact space, and a single vent valve can replace the function of two vent valves. Compared with the traditional solenoid valve which requires a large number of copper coils, the embodiment of the present invention only requires a memory alloy wire of about 30 mm, which greatly saves materials, reduces volume, and reduces weight. The cavity structure inside the housing 1 of the embodiment of the present invention is reasonably designed and has good air tightness. The working environment of the memory alloy drive wire 8 is little affected by the low-temperature flowing air, ensuring that the movement distance of the memory alloy drive wire 8 can meet the use requirements.

[0083] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A dual valve core vent valve driven by memory alloy, characterized in that: It comprises a housing and a bottom cover, wherein two groups of memory alloy actuators are mounted on the bottom cover, each group of memory alloy actuators comprises a valve core, a driving rod, a clamping terminal, a memory alloy driving wire and a reset spring, and the housing covers the two groups of memory alloy actuators and is assembled with the bottom cover to form a sealed body; The front end of the shell is provided with an inflation port and a main air channel, the inflation port and the main air channel are not connected to each other, the two valve cores are respectively placed in the first valve chamber and the second valve chamber, the inflation port is connected to the first valve chamber and the second valve chamber, the first air chamber and the second air chamber are correspondingly arranged above the first valve chamber and the second valve chamber, and the main air channel is connected to the first air chamber and the second air chamber; the two valve cores are defined as the first valve core and the second valve core, the first valve core controls the sealing or circulation of the gas between the first air chamber and the first valve chamber by moving up and down, and the second valve core controls the sealing or circulation of the gas between the second air chamber and the second valve chamber by moving up and down; the upper surface of the shell is provided with an air release port connected to the second air chamber; The driving rod includes a movable push rod and a memory alloy driving wire mounting portion, the movable push rod is arranged at the front end of the memory alloy driving wire mounting portion, and the memory alloy driving wire is embedded in the memory alloy driving wire mounting portion; a cavity for installing the reset spring is provided at the bottom of the driving rod, and both ends of the reset spring are connected to the inner wall of the cavity on the driving rod. The tail end of the memory alloy driving wire is clamped and fixed by the clamping terminal, and the clamping terminal is fixedly mounted on the end of the bottom cover; The valve core is arranged at the front end of the movable push rod, and a notch is provided on one side of the valve core close to the movable push rod, which is at an angle of 30 to 60 degrees with the horizontal plane. The movable push rod includes a first rod body and a second rod body, the first rod body is connected to the memory alloy drive wire mounting portion, the second rod body is vertically connected to the first rod body on the same horizontal plane, and the second rod body extends into the notch; When the memory alloy driving wire is energized to drive the driving rod to move horizontally forward and backward, the second rod body also moves horizontally forward and backward in the slot. The second rod body is in contact with the slot, and the horizontal forward and backward movement of the second rod body in the slot is converted into the up and down movement of the valve core.

2. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The shell is provided with a top cover for conveniently placing a sound-absorbing sponge in the shell. The top cover and the shell are assembled by any one of gluing, snap-fitting or ultrasonic welding. The sound-absorbing sponge is arranged in the second air chamber.

3. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: A notch which forms an angle of 45° with the horizontal plane is provided on one side of the valve core close to the movable push rod.

4. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The memory alloy drive wire is a U-shaped wire, and the memory alloy drive wire mounting portion includes a boss adapted to the width of the U-shaped wire and having a U-shaped outer contour. The U-shaped wire is wound on the boss, and the two tail ends of the U-shaped wire are respectively fixed by separate clamping terminals.

5. The dual valve core vent valve driven by memory alloy according to claim 4, characterized in that: The length of the memory alloy driving wire is 30 mm.

6. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The shell and the bottom cover are assembled by any one of glue dispensing, snap-fitting or ultrasonic welding.

7. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The bottom cover is provided with a first partition wall, and the shell is provided with a second partition wall at a corresponding position. The first partition wall and the second partition wall are both provided with semicircular concave surfaces. When the shell and the bottom cover are assembled into a sealed body, the respective semicircular concave surfaces on the first partition wall and the second partition wall just form a whole circle for the second rod body to pass through. The first partition wall and the second partition wall are arranged on a side of the valve core close to the movable push rod, and the side surface of the valve core close to the movable push rod is in contact with the side surfaces of the first partition wall and the second partition wall.

8. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The upper surface of the valve core is provided with a groove for placing a sealing O-ring, and the sealing O-ring is embedded in the groove.

9. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: The clamping terminal includes a clamping part, a main body and a pin connected in sequence from top to bottom. The thickness of the main body is 0.3 mm. The middle gap formed by bending the clamping part is used for crimping the memory alloy drive wire. The thickness of the clamping part is 0.1-0.2 mm. The pin is used for plugging into the PCB board for conduction; four pin slots are provided on the bottom cover, and the pin is plugged into the PCB board after being inserted into the pin slot.

10. The dual valve core vent valve driven by memory alloy according to claim 1, characterized in that: A guide column is provided on the upper surface of the bottom cover, a guide groove adapted to the guide column is provided at the bottom of the memory alloy drive wire mounting portion, the return spring is arranged in the cavity of the guide groove, and one end of the return spring is connected to the front end surface of the guide column, and the other end is connected to the inner wall of the cavity of the guide groove.

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