Pneumatic valve body controlled by memory alloy

Abstract

The invention relates to the technical field of pneumatic control equipment, and discloses a memory alloy controlled pneumatic valve body which comprises a valve shell and a valve element assembly, and a gas cavity is formed in the valve shell and comprises a first cavity body, a second cavity body and a gas distribution channel; the first cavity is provided with an air inlet, and a one-way check valve assembly is arranged in the first cavity. The second cavity is provided with an air outlet, an exhaust port and an air distribution port; the valve element assembly comprises a valve element, the valve element extends into the gas cavity, a first sealing piece and a second sealing piece are arranged on the valve element, a first elastic reset piece is arranged between the valve element and the valve shell, when the valve element is in the first state, the first sealing piece blocks the exhaust port, and when the valve element is switched to the second state, the gas outlet is communicated with the exhaust port, and the second sealing piece blocks the gas distribution port. The number of the memory alloy wires adopted by the pneumatic valve body is small, cost can be well controlled, and compared with electronic products, the service life of the pneumatic valve body is obviously prolonged due to the fact that the one-way check valve assembly, the valve element, the first sealing body and other mechanical structures are adopted.

Description

Technical Field

[0001] This application relates to the field of pneumatic control equipment technology, and in particular to a pneumatic valve body controlled by a shape memory alloy. Background Technology

[0002] In the automotive industry, the comfort of vehicle seats has always been a pursuit of people. The massage function of car seats has gradually become a hot topic when people buy cars. The massage function can massage the passengers during vehicle use, thereby reducing people's fatigue during the journey.

[0003] However, most existing massage modules on the market use electromagnetic massage and other similar modules, which are relatively expensive and have a short lifespan. Therefore, to solve these problems, we provide a pneumatic valve body. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a pneumatic valve body controlled by a shape memory alloy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, this application provides a pneumatic valve body controlled by a shape memory alloy, the pneumatic valve body comprising a valve housing and a valve core assembly, wherein: The valve housing has a gas chamber inside and a valve core through hole. The gas chamber includes a first chamber, a second chamber, and a gas distribution channel for connecting the first chamber and each of the second chambers; the first chamber has an air inlet for communicating with a gas source, and a one-way check valve assembly is provided in the first chamber, the one-way check valve assembly being used to allow the gas path of the air inlet to flow unidirectionally towards the second chamber; the second chamber has an air outlet for communicating with a gas-using unit, an exhaust outlet for communicating with the outside, and a gas distribution port for communicating with the gas distribution channel; The valve core assembly includes a valve core controlled by a shape memory alloy wire. The first end of the valve core extends into the gas chamber through the valve core through hole, and the peripheral wall of the valve core is dynamically sealed to the valve core through hole. The valve core is provided with a first sealing element and a second sealing element. A first elastic reset element is provided between the valve core and the valve housing. When the valve core is in a first state, the first elastic reset element is used to block the exhaust port with the first sealing element. When the valve core switches to a second state under the control of the shape memory alloy wire, the first sealing element releases the blockage of the exhaust port, so that the gas outlet communicates with the exhaust port, and the second sealing element blocks the gas distribution port.

[0006] The pneumatic valve body provided by the above technical solution forms an air path that can be connected to the air-using unit through the air inlet, first chamber, air distribution channel, second chamber, air outlet, and exhaust port of the first chamber in the valve housing. The air-using unit can be an air bag. Generally, when an air bag is used as a massage unit, the air bag has three working states: inflation, pressure holding, and deflation. The pneumatic valve body provided by this technical solution can switch the air bag between these three states using only a valve core controlled by a shape memory alloy wire and a one-way check valve assembly. When the valve core is in the first state under the action of the first elastic reset member, the first sealing member on the valve core can block the exhaust port of the second chamber. At this time, the one-way check valve assembly releases the blockage of the air inlet of the first chamber, and the high-pressure gas in the air source enters the first chamber through the air inlet. The gas in the first chamber passes through the air distribution channel and... The air inlet enters the corresponding second chamber, and then the air enters the corresponding air bag through the outlet of the second chamber. After the air bag is inflated to a sufficient amount, the one-way check valve assembly re-seals the air inlet of the first chamber, thus putting the air bag into a pressure-holding state. When the air bag needs to switch from the pressure-holding state to the deflating state, the corresponding shape memory alloy wire is energized. When the shape memory alloy wire is energized, it contracts and pulls the valve core, causing the valve core to overcome the force of the first elastic reset element and switch to the second state. At this time, the second sealing element of the valve core seals the air inlet of the second chamber, and at the same time, the first sealing element releases the seal on the exhaust port. Thus, the air bag connects with the exhaust port through the outlet of the second chamber, and the gas in the air bag is discharged through the exhaust port, thus switching the air bag to the deflating state. The air bag can achieve the massage function by switching between the inflating state, the pressure-holding state, and the deflating state.

[0007] As can be seen from the above analysis, the pneumatic valve body provided in this application can achieve the function of air bag massage by using a valve core controlled by a shape memory alloy wire and a one-way check valve assembly. The number of shape memory alloy wires used is small, which can effectively control the cost. Furthermore, the mechanical structure such as the one-way check valve assembly, valve core, and first sealing body has a significantly longer service life compared to electronic products.

[0008] According to the technical solution provided in the embodiments of this application, in the above-mentioned pneumatic valve body, the valve housing has a valve disc assembly extending into the gas chamber, and the valve disc assembly cooperates with the valve housing to form the first cavity, at least one second cavity, and the gas distribution channel in the gas chamber.

[0009] According to the technical solution provided in the embodiments of this application, in the second cavity, the exhaust port and the air distribution port are arranged opposite to each other. The first sealing element and the second sealing element provided on the valve core are located between the exhaust port and the air distribution port. When the valve core is in the first state, the first sealing element blocks the exhaust port, and a gap is formed between the second sealing element and the air distribution port. When the valve core drives the second sealing element to stick to the air distribution port under the action of the shape memory alloy wire, a gap is formed between the first sealing element and the exhaust port to release the blockage of the exhaust port.

[0010] According to the technical solution provided in the embodiments of this application, the valve core extends along the arrangement direction of the exhaust port and the air distribution port, and the valve core can slide into the second cavity along its own length direction; the first sealing member and the second sealing member are located between the exhaust port and the air distribution port.

[0011] According to the technical solution provided in the embodiments of this application, a third cavity is formed in the gas distribution channel, the valve core through hole is disposed on the side wall of the third cavity, the valve core passes through the third cavity and extends from the gas distribution port into the second cavity, the first sealing member is disposed at the end of the first end of the valve core; an annular air gap is formed between the peripheral wall of the valve core and the inner wall of the gas distribution port, the second sealing member is an annular sealing ring and is sleeved on the valve core, when the valve core is in the second state, the annular sealing ring blocks the annular air gap.

[0012] According to the technical solution provided in the embodiments of this application, the surface of the first end of the valve core is formed with a groove that opens toward the exhaust port, and the first sealing member is embedded in the groove; the peripheral wall of the valve core is provided with an annular groove, and the second sealing member is sleeved in the annular groove.

[0013] According to the technical solution provided in the embodiments of this application, a third cavity is formed in the gas distribution channel, the valve core through hole is disposed on the side wall of the third cavity, the valve core passes through the third cavity and extends from the gas distribution port into the second cavity, the first sealing member and the second sealing member have an integral structure to form a first sealing body, the portion of the valve core located in the second cavity forms a fixing part, the diameter of the fixing part is larger than the diameter of the gas distribution port, and a snap-fit ​​groove is provided at the center of the fixing part, the first sealing body is disposed in the snap-fit ​​groove, and the portion facing the exhaust port forms the first sealing member, and the portion away from the exhaust port forms the second sealing member.

[0014] According to the technical solution provided in the embodiments of this application, along the length direction perpendicular to the valve core, the air distribution port is located on one side of the valve core, and the portion of the valve core extending into the second cavity is provided with a lever extending toward the air distribution port. The first sealing member is disposed at the end of the first end of the valve core, and the second sealing member is disposed on the lever.

[0015] According to the technical solution provided in the embodiments of this application, the arrangement direction of the exhaust port and the air distribution port is perpendicular to the length direction of the valve core, wherein: The first and second sealing elements have an integral structure to form a first sealing body. The valve core located in the second cavity has a through hole that extends through the valve core along the arrangement direction of the exhaust port and the air distribution port. The first sealing body is disposed on the valve core through the through hole. The valve shell and the corresponding part of the valve core have a support portion. The valve shell and the support portion cooperate to form a lever assembly. When the valve core is in the first state, the valve core presses the first sealing body onto the exhaust port under the action of the first elastic reset element and releases the blockage of the air distribution port. When the second end of the valve core swings under the pull of the shape memory alloy wire, the valve core is controlled to switch from the first state to the second state, thereby causing the valve core to press the first sealing body onto the air distribution port and release the blockage of the exhaust port by the first sealing body.

[0016] According to the technical solution provided in the embodiments of this application, the one-way check valve assembly includes a sealing block and a second elastic reset member. The second elastic reset member is disposed between the sealing block and the side wall of the first cavity to provide a force to the sealing block to press the air inlet. When the one-way check valve assembly is in the first state, the sealing block blocks the air inlet. When the one-way check valve assembly is in the second state, the air inlet is open to allow high-pressure gas to enter the gas chamber. The one-way check valve assembly is normally in the first state and can switch from the first state to the second state under the action of external high-pressure gas.

[0017] In summary, this application provides a specific structure of a pneumatic valve body controlled by a shape memory alloy. In this pneumatic valve body, the switching of the air-filling, pressure-holding, and air-deleting states of the air-using unit is realized through the cooperation between the one-way check valve assembly and the air inlet of the first cavity, and the cooperation between the valve core and the first and second seals provided on it and the exhaust port and air distribution port of the second cavity, thereby enabling the realization of massage functions, support functions, etc.

[0018] In this pneumatic valve body, each second chamber only requires one valve core, and each valve core only requires one shape memory alloy wire in conjunction with the first elastic reset element to achieve control. The one-way check valve assembly and other components are all mechanical parts, which have low cost and long service life. Therefore, the service life of this pneumatic valve body is long. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pneumatic valve body in an inflated state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pneumatic valve body in a pressure-holding state according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the pneumatic valve body in a deflation state according to an embodiment of the present invention; Figure 4 A schematic diagram of a first sealing body in a pneumatic valve body provided in an embodiment of the present invention; Figure 5 A schematic diagram of a first sealing body in a pneumatic valve body provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first sealing body in the pneumatic valve body provided in an embodiment of the present invention; Figure 7 A schematic diagram of a first sealing body in a pneumatic valve body provided in an embodiment of the present invention; Figure 8 A schematic diagram of a pneumatic valve body with a lever structure provided in an embodiment of the present invention; Figure 9 This is a top view of a pneumatic valve body provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the exhaust port and the second seal in the pneumatic valve body provided in an embodiment of the present invention.

[0020] Icons: 1, Valve housing; 11, Air inlet; 111, First cover; 112, Second cover; 12, Air outlet; 13, Exhaust outlet; 131, Protrusion; 14, Valve disc assembly; 141, First disc; 142, Second disc; 2, Gas chamber; 21, First chamber; 22, Second chamber; 23, Third chamber; 231, Arc-shaped surface; 24, Gas distribution channel; 3, One-way check valve assembly; 31, Sealing block; 32, Second elastic reset element; 4, Valve core; 41, First sealing body; 411, First sealing element; 412, Second sealing element; 42, First elastic reset element; 43, Pulley; Second sealing body; 44; 5, Shape memory alloy wire. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Please refer to Figure 1 , Figure 2 as well as Figure 3 This application provides a pneumatic valve body controlled by a shape memory alloy, the pneumatic valve body including a valve housing 1 and a valve core assembly, wherein: A gas chamber 2 is formed inside the valve housing 1. The valve housing 1 is provided with a valve core through hole 4, which is the part where the valve core 4 passes through the valve housing 1. like Figure 1 As shown, the gas chamber 2 includes a first chamber 21, a second chamber 22, and a gas distribution channel 24 for connecting the first chamber 21 with each of the second chambers 22. Multiple second chambers 22 can be simultaneously configured, meaning multiple gas-using units can be controlled simultaneously by a single pneumatic valve. The first chamber 21 has an air inlet 11 for connecting to a gas source, and a one-way check valve assembly 3 is provided within the first chamber 21. The one-way check valve assembly 3 allows the gas path of the air inlet 11 to unidirectionally flow towards the second chamber 22. The gas source connected to the air inlet 11 can be an external gas source such as a pneumatic pump or a high-pressure gas tank. The specific structure of the one-way check valve assembly 3 can be found in the attached diagram. Figure 2 As shown, specifically, the one-way check valve assembly 3 includes a sealing block 31 and a second elastic reset member 32. The second elastic reset member 32 is disposed between the sealing block 31 and the side wall of the first cavity 21. The second elastic reset member 32 is in a stored state to provide a force to the sealing block 31 to press against the air inlet 11. The magnitude of the force provided by the second elastic reset member 32 to the sealing block 31 can be determined according to parameters such as the extension stroke and elastic modulus of the second elastic reset member 32, so as to meet the air pressure provided by the pneumatic valve body to the air-using unit. When the one-way check valve assembly 3 is in the first state, the sealing block 31 blocks the air inlet 11. When the one-way check valve assembly 3 is in the second state, the air inlet 11 is opened so that high-pressure gas can enter the gas chamber 2. The one-way check valve assembly 3 is normally in the first state and can be switched from the first state to the second state under the action of external high-pressure gas. The second cavity 22 has an air outlet 12 for communicating with the air supply unit, an exhaust port 13 for communicating with the outside, and an air distribution port for communicating with the air distribution channel 24. When the air supply unit is used in a car seat, it can be an air bag, air bladder, etc. The valve core assembly includes a valve core 4 controlled by a shape memory alloy wire 5. The first end of the valve core 4 extends into the gas chamber 2 through the through hole of the valve core 4, and there is a dynamic sealing fit between the peripheral wall of the valve core 4 and the through hole of the valve core 4. The valve core 4 is provided with a first sealing element 411 and a second sealing element 412. A first elastic reset element 42 is provided between the valve core 4 and the valve body 1. When the valve core 4 is in the first state, the first elastic reset element 42 is used to block the exhaust port 13 by the first sealing element 411. When the valve core 4 switches to the second state under the control of the shape memory alloy wire 5, the first sealing element 411 releases the blockage of the exhaust port 13 so that the outlet 12 is connected to the exhaust port 13, and the second sealing element 412 blocks the gas distribution port.

[0023] The pneumatic valve body provided by the above technical solution can form an air path that can be connected from the air source to the air-using unit through the air inlet 11, the air distribution channel 24, the second chamber 22, the air outlet 12, and the exhaust port 13 in the first chamber 21 of the valve housing 1. The air-using unit can be an air bag, an elastic air bladder, etc., for example, Figure 1 , Figure 2 as well as Figure 3 As shown, when an air bag is used as a massage or support unit, the air bag has three working states: inflation, pressure holding, and deflation. like Figure 1 As shown, the air bag is inflated at this time, the valve core 4 is in the first state, the first sealing element 411 on the valve core 4 blocks the exhaust port 13, the second sealing element 412 releases the blockage of the air distribution port connecting the second cavity 22 and the air distribution channel 24, and the one-way check valve assembly 3 is in the second state and releases the blockage of the air inlet 11. At this time, the high-pressure gas in the air source can enter the air bag in sequence through the air inlet 11, the first cavity 21, the air distribution channel 24, the air distribution port, the second cavity 22, and the air outlet 12 to complete the inflation of the air bag. like Figure 2 As shown, at this time the air bag is in a pressure-holding state, the valve core 4 is in the first state, the first seal 411 blocks the exhaust port 13, and the one-way check valve assembly 3 is in the first state to block the air inlet 11. At this time, the gas chamber 2 is only connected to the air bag, which can ensure the pressure inside the air bag and keep the air bag in a pressure-holding state. like Figure 3As shown, the air bag is in a depressurized state at this time, and the shape memory alloy wire 5 is in a contracted state after being energized. This overcomes the force of the first elastic reset member 42 and pulls the valve core 4 to the second state. The first seal member 411 releases the blockage of the exhaust port 13, and the second seal member 412 blocks the gas distribution port. The one-way check valve assembly 3 is in the first state and blocks the air inlet 11. At this time, the second chamber 22 in the gas chamber 2 is isolated from the first chamber 21. The exhaust port 13 in the second chamber 21 is connected to the air outlet 12. The gas in the air bag can be discharged through the path of the air outlet 12, the second chamber 22, and the exhaust port 13, thereby making the air bag in a depressurized state.

[0024] As can be seen from the above analysis, the pneumatic valve body provided by this technical solution can switch the air bag between these three states using only a valve core 4 controlled by a shape memory alloy wire 5 and a one-way check valve assembly 3. When the valve core 4 is in the first state under the action of the first elastic reset member 42, the first sealing member 411 provided on the valve core 4 can block the exhaust port 13 of the second chamber. At this time, the one-way check valve assembly 3 releases the blockage on the air inlet 11 of the first chamber, and the high-pressure gas in the gas source enters the first chamber 21 through the air inlet 11. The gas in the first chamber 21 enters the corresponding second chamber 22 through the gas distribution channel 24 and the gas distribution port, and then enters the corresponding air bag through the air outlet 12 of the second chamber 22. After the air bag is filled with enough gas in the inflated state, the one-way check valve assembly 3 releases the blockage on the first chamber 21. The check valve assembly 3 re-seals the air inlet 11 of the first chamber 21, thereby putting the air bag into a pressure-holding state. When the air bag needs to switch from the pressure-holding state to the deflation state, the corresponding shape memory alloy wire 5 is energized. When the shape memory alloy wire 5 is energized and contracts, it pulls the valve core 4, causing the valve core 4 to overcome the force of the first elastic reset member 42 and switch to the second state. At this time, the second sealing member 412 set on the valve core 4 seals the air distribution port of the second chamber. At the same time, the first sealing member 411 releases the seal on the exhaust port 13, and the air bag connects with the exhaust port 13 through the air outlet 12 of the second chamber 22. The gas in the air bag is discharged through the exhaust port 13, thereby switching the air bag to the deflation state. The air bag can achieve massage and support functions during the switching process between the inflation state, pressure-holding state and deflation state.

[0025] As can be seen from the above analysis, the pneumatic valve body provided in this application can achieve the function of air bag massage by means of a valve core 4 controlled by a shape memory alloy wire 5 and a one-way check valve assembly 3. The number of shape memory alloy wires 5 used is small, which can effectively control the cost. Moreover, the mechanical structure such as the one-way check valve assembly 3, the valve core 4 and the first sealing body has a significantly improved service life compared with electronic products.

[0026] In one specific embodiment, in order to facilitate the formation of a first cavity 21, a second cavity 22, and a gas distribution channel 24 in the gas chamber 2 within the valve housing 1, the pneumatic valve body described above has a valve disc assembly 14 extending into the gas chamber 2. The valve disc assembly 14 cooperates with the valve housing 1 to form a first cavity 21, at least one second cavity 22, and a gas distribution channel 24 within the gas chamber 2.

[0027] Specifically, valve body 1 has a split structure, such as Figure 2 As shown, the housing 1 includes a first cover 111 and a second cover 112, and the valve assembly 14 includes a first valve body 141 and a second valve body 142. The first valve body 141 and the second valve body 142 cooperate to form a first cavity 21, the first valve body 141 and the second cover 112 cooperate to form a gas distribution channel 24, and the first valve body 141 and the first cover 111 cooperate to form a second cavity 22. This structure facilitates the installation of the valve core 4. At the same time, after removing the first cover 111, it is convenient to maintain the first seal 411 and the second seal 412.

[0028] In one specific implementation, in the second cavity 22 of the valve housing 1, the exhaust port 13 is arranged opposite to the air distribution port, that is, the air distribution port and the exhaust port 13 are respectively arranged on two opposite side walls of the second cavity 22, such as... Figure 1 Taking the orientation shown as an example, the exhaust port 13 is located on the left wall of the second cavity 22, and the air distribution port is located on the right wall of the second cavity 22. The first sealing element 411 and the second sealing element 412 provided on the valve core 4 are located between the exhaust port 13 and the air distribution port. When the valve core 4 is in the first state, the first sealing element 411 blocks the exhaust port 13, and a gap is formed between the second sealing element 412 and the air distribution port. When the valve core 4 drives the second sealing element 412 to stick to the air distribution port under the action of the shape memory alloy wire 5, a gap is formed between the first sealing element 411 and the exhaust port 13 to release the blockage of the exhaust port 13.

[0029] In the pneumatic valve body provided by the above implementation, there are various specific ways in which the first seal 411, the second seal 412, the valve core 4, the exhaust port 13, and the air distribution port are matched, as described below: In one specific implementation, such as Figure 1 As shown, the valve core 4 extends along the arrangement direction of the exhaust port 13 and the air distribution port, and the valve core 4 can slide into the second cavity 22 along its own length direction; the first seal 411 and the second seal 412 are located between the exhaust port 13 and the air distribution port. Specifically, the length direction of the valve core 4 can be parallel to the arrangement direction of the exhaust port 13 and the air distribution port.

[0030] Specifically, such as Figure 1As shown, a third cavity 23 is formed within the air distribution channel 24. A valve core through-hole is disposed on the side wall of the third cavity 23. The valve core 4 extends through the third cavity 23 from the air distribution port into the second cavity 22. A second sealing body 44 is disposed in the third cavity 23. A first sealing element 411 is disposed at the end of the first end of the valve core 4. An annular air gap is formed between the peripheral wall of the valve core 4 and the inner wall of the air distribution port. The second sealing element 412 is an annular sealing ring and is sleeved on the valve core 4. When the valve core 4 is in the second state, the annular sealing ring seals the annular air gap. Specifically, a groove with an opening facing the exhaust port 13 is formed on the surface of the first end of the valve core 4, and the first sealing element 411 is embedded in the groove. An annular groove is provided on the peripheral wall of the valve core 4, and the second sealing element 412 is sleeved in the annular groove.

[0031] In another specific implementation, such as Figure 4 and Figure 5 As shown, the specific installation method between the first seal 411 and the second seal 412 and the valve core 4 can also be as follows: along the length direction perpendicular to the valve core 4, the air distribution port is located on one side of the valve core 4, and the part of the valve core 4 that extends into the second cavity 22 is provided with a lever 43 extending toward the air distribution port. The first seal 411 is provided at the end of the first end of the valve core 4, and the second seal 412 is provided on the lever 43.

[0032] In another specific implementation, the arrangement direction of the exhaust port 13 and the air distribution port is perpendicular to the length direction of the valve core 4, wherein: The first sealing element 411 and the second sealing element 412 have an integral structure to form the first sealing body 41. The valve core 4 is provided with a through hole in the part located in the second cavity 22, which runs through the valve core 4 along the arrangement direction of the exhaust port 13 and the air distribution port. The first sealing body 41 is disposed on the valve core 4 through the through hole. The valve shell 1 and the valve core 4 are respectively provided with a support part in the middle part. The valve shell 1 forms a lever assembly by cooperating with the support part. The first elastic reset element 42 is disposed between the valve core 4 and the side wall where the air distribution port is located. When the valve core 4 is in the first state, the valve core 4 presses the first sealing body 41 on the exhaust port 13 under the action of the first elastic reset element 42 and releases the blockage of the air distribution port. When the second end of the valve core 4 swings under the pull of the shape memory alloy wire 5, the valve core 4 is controlled to switch from the first state to the second state, thereby pressing the first sealing body 41 on the air distribution port and releasing the blockage of the exhaust port 13 by the first sealing body 41.

[0033] Based on the above implementation, in order to facilitate dynamic sealing between valve core 4 and valve core through hole, a second sealing body 44 is provided between valve core 4 and valve core through hole. The specific arrangement of the second sealing body 44 can also be selected in various ways, as described below: Specifically, in a particular way, such as Figure 1As shown, a third cavity 23 is formed within the gas distribution channel 24. A valve core through-hole is located on the side wall of the third cavity 23. The valve core 4 extends through the third cavity 23 from the gas distribution port into the second cavity 22. A second sealing body 44 is disposed within the third cavity 23. When the third cavity 23 is formed within the gas distribution channel 24 and the valve core 4 extends through the third cavity 23 into the second cavity 22, the second sealing body 44 can be... Figure 1 The structure shown; In another specific embodiment, when the valve core 4 does not pass through the air distribution passage 24, the seal between the valve core 4 and the valve core through hole can specifically be adopted. Figure 4 , Figure 5 as well as Figure 6 The structure shown is sufficient as long as it can achieve a dynamic seal between the valve core 4 and the valve core through hole.

[0034] In addition, such as Figure 4 and Figure 5 The structure shown has a valve core through hole located on the side wall of the second cavity 22. When the second sealing body 44 adopts... Figure 5 In the structure shown, the valve core 4 is provided with a limiting protrusion opposite to the valve core through hole, and the second sealing body 44 is disposed between the limiting protrusion and the side wall of the second cavity 22 where the valve core through hole is located, and is in a compressed and stored state.

[0035] When the second sealing body 44 is used Figure 6 In the structure shown, the second elastic sealing body 44 is disposed between the second cover of the valve housing and the valve disc 14.

[0036] Of course, such as Figure 6 As shown, the specific installation method between the first sealing element 411 and the second sealing element 412 and the valve core 4 can also be as follows: a third cavity 23 is formed in the air distribution channel 24, the valve core 4 through hole is provided on the side wall of the third cavity 23, the valve core 4 passes through the third cavity 23 and extends from the air distribution port into the second cavity 22, the first sealing element 411 and the second sealing element 412 have an integral structure to form the first sealing body 41, the part of the valve core 4 located in the second cavity 22 forms a fixing part, the diameter of the fixing part is larger than the diameter of the air distribution port, and a snap-fit ​​groove is provided at the center of the fixing part, the first sealing body is provided in the snap-fit ​​groove, and the part facing the exhaust port 13 forms the first sealing element 411, and the part away from the exhaust port 13 forms the second sealing element 412.

[0037] Based on the technical solutions provided in the above embodiments, such as Figure 4As shown, the one-way check valve assembly 3 installed in the first cavity 21 includes a sealing block 31 and a second elastic reset member 32. The second elastic reset member 32 is disposed between the sealing block 31 and the side wall of the first cavity 21 to provide a force to the sealing block 31 to press against the air inlet 11. When the one-way check valve assembly 3 is in the first state, the sealing block 31 blocks the air inlet 11 under the force of the second elastic reset member 32. When the pressure of the high-pressure gas in the gas source on the sealing block 31 is greater than the force of the second elastic reset member 32 on the sealing block 31, the sealing block 31 releases the blockage of the air inlet 11, and the one-way check valve assembly 3 switches to the second state, and the air inlet 11 opens so that the high-pressure gas can enter the gas chamber 2. The one-way check valve assembly 3 is normally in the first state and can switch from the first state to the second state under the action of external high-pressure gas.

[0038] Furthermore, when the first cavity 21 is provided with an air outlet 12 and an exhaust outlet 13, the air outlet 12 and the exhaust outlet 13 can be located on different side walls, such as... Figure 1 As shown; the air outlet 12 and the exhaust outlet 13 can also be located on the same side wall, such as... Figure 7 As shown, the specific settings can be customized according to actual needs.

[0039] Based on the technical solutions provided in the above embodiments, the second cavity 22 is provided with the position of the exhaust port 13, and a ring-shaped protrusion 131 is formed around the exhaust port 13. The protrusion 131 can improve the sealing performance when the first sealing member 411 presses the exhaust port 13.

[0040] Furthermore, an annular arc surface 231 is formed at the location where the air distribution port is formed in the second cavity 22, and the second sealing element 412 is an annular sealing ring. When the second sealing element 412 presses against the air distribution port, the second sealing element 412 cooperates with the arc surface 231, thereby improving the sealing performance when the second sealing element 412 presses against the air distribution port.

[0041] In summary, this application provides a specific structure of a pneumatic valve body controlled by a shape memory alloy. In this pneumatic valve body, the switching of the air-filling, pressure-holding, and air-deleting states of the air-using unit is realized through the cooperation between the one-way check valve assembly 3 and the air inlet 11 of the first cavity 21, and the cooperation between the valve core 4 and the first seal 411 and the second seal 412 provided on it and the exhaust port 13 of the second cavity 22 and the air distribution port, thereby realizing the massage function.

[0042] In this pneumatic valve body, each second cavity 22 only requires one valve core 4, and each valve core 4 only requires one shape memory alloy wire 5 in conjunction with the first elastic reset member 42 to achieve control. The one-way check valve assembly 3 and other components are all mechanical components, which have low cost and long service life. Therefore, the service life of this pneumatic valve body is long.

[0043] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A pneumatic valve body controlled by a shape memory alloy, characterized in that, Includes valve housing (1) and valve core assembly: The valve housing (1) forms a gas chamber (2) inside, and the valve housing (1) is provided with a valve core through hole, wherein: The gas chamber (2) includes a first chamber (21), a second chamber (22), and a gas distribution channel (24) for connecting the first chamber (21) and the second chamber (22); the first chamber (21) has an air inlet (11) for communicating with a gas source, and a one-way check valve assembly (3) is provided in the first chamber (21), the one-way check valve assembly (3) for unidirectionally guiding the gas path of the air inlet (11) to the second chamber (22); the second chamber (22) has an air outlet (12) for communicating with a gas-using unit, an exhaust outlet (13) for communicating with the outside, and a gas distribution port for communicating with the gas distribution channel (24); The valve core assembly includes a valve core (4) controlled by a shape memory alloy wire (5). The first end of the valve core (4) extends into the gas chamber (2) through the valve core through hole, and the peripheral wall of the valve core (4) is dynamically sealed to the valve core through hole. The valve core (4) is provided with a first sealing element (411) and a second sealing element (412). A first elastic reset element (42) is provided between the valve core (4) and the valve housing (1). When the valve core (4) is in the first state, the first elastic reset element (42) is used to block the exhaust port (13) with the first sealing element (411). When the valve core (4) switches to the second state under the control of the shape memory alloy wire (5), the first sealing element (411) releases the blockage of the exhaust port (13) so that the outlet (12) communicates with the exhaust port (13), and the second sealing element (412) blocks the gas distribution port.

2. The pneumatic valve body controlled by shape memory alloy according to claim 1, characterized in that, The valve housing (1) has a valve disc assembly (14) extending into the gas chamber (2), the valve disc assembly (14) cooperating with the valve housing (1) to form the first cavity (21), at least one second cavity (22) and the gas distribution channel (24) in the gas chamber (2).

3. The pneumatic valve body controlled by shape memory alloy according to claim 1, characterized in that, In the second cavity (22), the exhaust port (13) is arranged opposite to the air distribution port. The first sealing element (411) and the second sealing element (412) provided on the valve core (4) are located between the exhaust port (13) and the air distribution port. When the valve core (4) is in the first state, the first sealing element (411) blocks the exhaust port (13), and a gap is formed between the second sealing element (412) and the air distribution port. When the valve core (4) drives the second sealing element (412) to stick to the air distribution port under the action of the shape memory alloy wire (5), a gap is formed between the first sealing element (411) and the exhaust port (13) to release the blockage of the exhaust port (13).

4. The shape memory alloy controlled pneumatic valve body according to claim 3, characterized in that, The valve core (4) extends along the arrangement direction of the exhaust port (13) and the air distribution port, and the valve core (4) can slide into the second cavity (22) along its own length direction; the first seal (411) and the second seal (412) are located between the exhaust port (13) and the air distribution port.

5. The shape memory alloy controlled pneumatic valve body according to claim 4, characterized in that, A third cavity (23) is formed in the gas distribution channel (24). The valve core through hole is disposed on the side wall of the third cavity (23). The valve core (4) passes through the third cavity (23) and extends from the gas distribution port into the second cavity (22). The first sealing member (411) is disposed at the end of the first end of the valve core (4). An annular air gap is formed between the peripheral wall of the valve core (4) and the inner wall of the gas distribution port. The second sealing member (412) is an annular sealing ring and is sleeved on the valve core (4). When the valve core (4) is in the second state, the annular sealing ring blocks the annular air gap.

6. The shape memory alloy controlled pneumatic valve body according to claim 5, characterized in that, The surface of the first end of the valve core (4) is formed with a groove that opens toward the exhaust port (13), and the first sealing member (411) is embedded in the groove; the peripheral wall of the valve core (4) is provided with an annular groove, and the second sealing member (412) is sleeved in the annular groove.

7. The shape memory alloy controlled pneumatic valve body according to claim 4, characterized in that, A third cavity (23) is formed in the gas distribution channel (24). The valve core through hole is disposed on the side wall of the third cavity (23). The valve core (4) passes through the third cavity (23) and extends from the gas distribution port into the second cavity (22). The first sealing member (411) and the second sealing member (412) have an integral structure to form the first sealing body (41). The portion of the valve core (4) located in the second cavity (22) has a fixing part. The diameter of the fixing part is larger than the diameter of the gas distribution port, and a snap-fit ​​groove is provided at the center of the fixing part. The first sealing body (41) is disposed in the snap-fit ​​groove, and the first sealing member (411) is formed at the part facing the exhaust port (13), and the second sealing member (412) is formed at the part away from the exhaust port (13).

8. The pneumatic valve body controlled by shape memory alloy according to claim 3, characterized in that, Along the length direction perpendicular to the valve core (4), the air distribution port is located on one side of the valve core (4). The portion of the valve core (4) extending into the second cavity (22) is provided with a lever (43) extending toward the air distribution port. The first seal (411) is disposed at the end of the first end of the valve core (4), and the second seal (412) is disposed on the lever (43).

9. The shape memory alloy controlled pneumatic valve body according to claim 3, characterized in that, The arrangement direction of the exhaust port (13) and the air distribution port is perpendicular to the length direction of the valve core (4), wherein: The first sealing element (411) and the second sealing element (412) have an integral structure to form the first sealing body (41). The valve core (4) located in the second cavity (22) has a through hole that penetrates the valve core (4) along the arrangement direction of the exhaust port (13) and the air distribution port. The first sealing body (41) is disposed on the valve core (4) through the through hole. The valve shell (1) has a support portion corresponding to the middle part of the valve core (4). The valve shell (1) forms a lever assembly by cooperating with the support portion. When the valve core (4) is in the first state, the valve core (4) presses the first sealing body (41) onto the exhaust port (13) under the force of the first elastic reset member (42) and releases the blockage of the air distribution port. When the second end of the valve core (4) swings under the pull of the memory alloy wire (5), the valve core (4) is controlled to switch from the first state to the second state, thereby causing the valve core (4) to press the first sealing body (41) onto the air distribution port and release the blockage of the exhaust port (13) by the first sealing body (41).

10. The shape memory alloy controlled pneumatic valve body according to any one of claims 1-9, characterized in that, The one-way check valve assembly (3) includes a sealing block and a second elastic reset member. The second elastic reset member is disposed between the sealing block and the side wall of the first cavity (21) to provide a force to the sealing block to press the air inlet. When the one-way check valve assembly (3) is in the first state, the sealing block blocks the air inlet (11). When the one-way check valve assembly (3) is in the second state, the air inlet (11) is opened so that high-pressure gas can enter the gas chamber (2). The one-way check valve assembly (3) is normally in the first state and can be switched from the first state to the second state under the action of external high-pressure gas.

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