A valve assembly, a pneumatic massage system, and a seat

Abstract

This invention relates to the field of valve assembly technology, and specifically discloses a valve assembly, a pneumatic massage system, and a seat. The assembly includes a valve body, a valve core, and an actuator. The valve body includes a circuit board and has a valve cavity. The valve body has a first medium opening, a second medium opening, and a third medium opening communicating with the valve cavity. The valve core includes a sliding sleeve, a first valve stem, a second valve stem, and a first elastic element. The sliding sleeve is disposed in the valve cavity. The first valve stem is located at one end of the sliding sleeve, and the second valve stem is located at the other end of the sliding sleeve. The first elastic element is connected to the first and second valve stems. The actuator is connected to the circuit board and is used to actuate the sliding sleeve to move between the first, second, and third positions. Through this method, this invention can avoid the simultaneous occurrence of the first valve stem opening the first medium opening and the second valve stem opening the second medium opening, ensuring the air pump's supply pressure to other air bags and thus not affecting the air supply efficiency of other air bags.

Description

Technical Field

[0001] This invention relates to the field of valve assembly technology, and in particular to a valve assembly, a pneumatic massage system, and a seat. Background Technology

[0002] People often experience discomfort, even back pain, due to the static posture in vehicle seats during long journeys. To reduce this discomfort, vehicle seats are equipped with pneumatic massage systems. These systems consist of an air pump, valve assemblies, and air bags. The valve assembly regulates the inflation and deflation of the air bags to achieve the massage function. In practice, typically one air pump connects to multiple valve assemblies, supplying air to multiple air bags.

[0003] However, in the process of implementing the embodiments of the present invention, the inventors discovered that: currently, the valve assembly uses a valve core to move from one position to another to open and close the air inlet and the air outlet respectively. However, during the movement, the air inlet and the air outlet are prone to open at the same time, resulting in insufficient air pressure supplied by the air pump to other air bags, which affects the air supply efficiency of other air bags. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a valve assembly that avoids the simultaneous opening of the first medium opening and the second medium opening during the movement of the valve core, thereby ensuring the supply pressure of the air pump to other air bags and thus not affecting the air supply efficiency of other air bags.

[0005] To solve the above-mentioned technical problems, the present invention provides a valve assembly comprising a valve body, a valve core, and an actuator. The valve body includes a circuit board and has a valve cavity. The valve body has a first medium opening, a second medium opening, and a third medium opening communicating with the valve cavity. The valve core includes a sliding sleeve, a first valve stem, a second valve stem, and a first elastic element. The sliding sleeve is disposed in the valve cavity. The first valve stem is located at one end of the sliding sleeve, and the second valve stem is located at the other end of the sliding sleeve. The first elastic element is connected to the first valve stem and the second valve stem. The actuator is connected to the circuit board and is used to actuate the sliding sleeve to move between a first position, a second position, and a third position. When the sliding sleeve is in the first position, the first valve stem closes the first medium opening, and the second valve stem opens the second medium opening. When the sliding sleeve is in the second position, the first valve stem closes the first medium opening, and the second valve stem closes the second medium opening. When the sliding sleeve is in the third position, the first valve stem opens the first medium opening, and the second valve stem closes the second medium opening.

[0006] Optionally, the first valve stem is located inside one end of the sliding sleeve, and one end of the first valve stem extends out of one end of the sliding sleeve. The sliding sleeve is provided with a through-hole, and one end of the first valve stem is provided with a first stepped surface. When the sliding sleeve is in the first position, there is a first gap between the first wall surface of the through-hole and the first stepped surface. When the sliding sleeve is in the second position and the third position, the first wall surface abuts against the first stepped surface.

[0007] The second valve stem is located inside the other end of the sliding sleeve, and one end of the second valve stem extends out of the other end of the sliding sleeve. One end of the second valve stem is provided with a second stepped surface. When the sliding sleeve is in the first position and the second position, the second stepped surface abuts against the second wall surface of the through-hole. When the sliding sleeve is in the third position, there is a second gap between the second stepped surface and the second wall surface, and the second wall surface is opposite to the first wall surface.

[0008] Optionally, the other end of the first valve stem is provided with a receiving groove, the other end of the second valve stem is provided with a sleeve post, one end of the first elastic element is received in the receiving groove, and the other end of the elastic element is sleeved on the sleeve post.

[0009] Optionally, the inner wall of the valve cavity is provided with a sliding groove, and the sliding sleeve is slidably disposed in the sliding groove.

[0010] Optionally, the actuator includes an SMA element and a second elastic element, the SMA element being connected to the circuit board and the sliding sleeve, and the second elastic element being connected to the sliding sleeve and the bottom wall of the valve chamber.

[0011] Optionally, the number of SMA elements is two, the two SMA elements are arranged opposite each other, the middle part of one SMA element is connected to the sliding sleeve, the two ends of the other SMA element are respectively located on both sides of the sliding sleeve, and both ends of the other SMA element are connected to the circuit board.

[0012] Optionally, the number of SMA elements is two, with the two SMA elements located opposite each other on both sides of the sliding sleeve. Both ends of one SMA element are connected to the circuit board, and the middle part of the other SMA element is connected to the sliding sleeve.

[0013] Optionally, the number of SMA elements is one, with both ends of the SMA element located on one side of the sliding sleeve, both ends of the SMA element being connected to the circuit board, and the middle part of the SMA element being connected to the sliding sleeve around it.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a pneumatic massage system, including an air pump, an air bag and the above-mentioned valve assembly, wherein the air pump is connected to a first medium opening of the valve assembly and the air bag is connected to a third medium opening of the valve assembly.

[0015] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a seat, including the above-mentioned pneumatic massage system.

[0016] In this embodiment of the invention, the valve assembly includes a valve body, a valve core, and an actuator. The valve body includes a circuit board and has a valve cavity. The valve body has a first medium opening, a second medium opening, and a third medium opening communicating with the valve cavity. The valve core includes a sliding sleeve, a first valve stem, a second valve stem, and a first elastic element. The sliding sleeve is disposed in the valve cavity. The first valve stem is located at one end of the sliding sleeve, and the second valve stem is located at the other end of the sliding sleeve. The first elastic element is connected to the first valve stem and the second valve stem. The actuator is connected to the circuit board and is used to actuate the sliding sleeve to move between a first position, a second position, and a third position. When the sliding sleeve is in the first position, the first valve stem closes the first medium opening, and the second valve stem opens the second medium opening. When the sliding sleeve is in the second position, the first valve stem closes the first medium opening, and the second valve stem closes the second medium opening. When the sliding sleeve is in the third position, the first valve stem opens the first medium opening, and the second valve stem closes the second medium opening. As can be seen from the above, under the action of the actuator actuating sleeve and the first elastic element, the first valve stem closes the first medium opening and the second valve stem opens the second medium opening, the first valve stem closes the first medium opening and the second valve stem closes the second medium opening, and the first valve stem opens the first medium opening and the second valve stem closes the second medium opening. This avoids the simultaneous occurrence of the first valve stem opening the first medium opening and the second valve stem opening the second medium opening, ensuring the air pump's supply pressure to other air bags and thus not affecting the air supply efficiency of other air bags. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the valve assembly provided in an embodiment of the present invention;

[0019] Figure 2This is a cross-sectional schematic diagram of the valve assembly provided in an embodiment of the present invention;

[0020] Figure 3 This is another cross-sectional view of the valve assembly provided in an embodiment of the present invention;

[0021] Figure 4 This is another cross-sectional schematic diagram of the valve assembly provided in the embodiment of the present invention;

[0022] Figure 5 This is an exploded view of the valve core structure of the valve assembly provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram showing the connection between the valve core's sliding sleeve and the SMA element of the actuator in the valve assembly provided in this embodiment of the invention.

[0024] Figure 7 This is another schematic diagram showing the connection between the valve core's sliding sleeve and the SMA element of the actuator in the valve assembly provided in this embodiment of the invention.

[0025] Figure 8 This is another schematic diagram showing the connection between the valve core sleeve of the valve assembly provided in this embodiment of the invention and the SMA element of the actuator.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Valve assembly; 1. Valve body; 11. Upper shell; 111. Slide groove; 112. First medium opening; 113. Third medium opening; 12. Bottom shell; 121. Second medium opening; 122. Annular flange; 13. Circuit board; 14. Valve cavity; 2. Valve core; 21. Sliding sleeve; 211. Through port; 212. Sliding part; 213. Connecting groove; 22. First valve stem; 221. First stepped surface; 222. Receiving groove; 23. Second valve stem; 231. Second stepped surface; 232. Sleeve post; 2321. Abutment part; 24. First elastic element; 25. First seal; 26. Second seal; 3. Actuator; 31. SMA element; 32. Second elastic element. Detailed Implementation

[0028] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figures 1-4 The valve assembly 100 includes a valve body 1, a valve core 2, and an actuator 3. The valve body 1 is connected to a supply source, the outside environment, and a receiving end, allowing the receiving end to receive media supplied by the supply source or to discharge media from the receiving end to the outside environment. The supply source can be an air pump, and the receiving end can be an air bag, air bladder, etc. The valve core 2 is disposed within the valve body 1 and can slide within it. The valve core 2 is used to connect or close the valve body 1 to the supply source and to connect or close the valve body 1 to the outside environment. The actuator 3 is disposed within the valve body 1 and connected to both the valve body 1 and the valve core 2. The actuator 3 actuates the valve core 2 to slide between a first position, a second position, and a third position. When the valve core 2 is in the first position, it connects the valve body 1 to the outside environment and disconnects it from the supply source. When the valve core 2 is in the second position, it disconnects the valve body 1 from both the supply source and the outside environment. When the valve core 2 is in the third position, it connects the valve body 1 to the supply source and disconnects it from the outside environment.

[0031] For valve body 1 mentioned above, please refer to Figures 2-3The valve body 1 includes an upper shell 11, a bottom shell 12, and a circuit board 13. The upper shell 11 is connected to the bottom shell 12, and the upper shell 11 and the bottom shell 12 together enclose a valve cavity 14. The circuit board 13 is fixed inside the bottom shell 12, and a portion of the circuit board 13 extends out of the bottom shell 12, that is, the circuit board 13 is fixed inside the valve cavity 14, and a portion of the circuit board 13 extends out of the valve cavity 14. The upper shell 11 is provided with a sliding groove 111, a first medium opening 112, and a third medium opening 113. The sliding groove 111 is located on the inner sidewall of the upper shell 11, that is, the sliding groove 111 is located on the inner sidewall of the valve cavity 14. In this embodiment, there are two sliding grooves 111, and the two sliding grooves 111 are located opposite each other on the two inner sidewalls of the upper shell 11. Both the first medium opening 112 and the third medium opening 113 are connected to the valve chamber 14. The first medium opening 112 is located at the top of the upper shell 11, and the third medium opening 113 is located on one side of the upper shell 11. The first medium opening 112 is used for connection to the supply source, and the third medium opening 113 is used for connection to the receiving end. The bottom shell 12 is provided with a second medium opening 121 and an annular flange 122. The second medium opening 121 is connected to the valve chamber 14 and is located at the bottom of the bottom shell 12. The second medium opening 121 is opposite to the first medium opening 112 and is used for connection to the outside. The annular flange 122 surrounds the second medium opening 121 and is used for fitting part of the actuator 3.

[0032] It is understood that the valve body 1 is not limited to the above structure. The valve body 1 can be other structures. For example, the valve body 1 does not include the bottom shell 12. The upper shell 11 is connected to the circuit board 13. The upper shell 11 and the circuit board 13 enclose the valve cavity 14. That is, the surface of the circuit board 13 facing the upper shell 11 is the bottom wall of the valve cavity 14. The circuit board 13 is provided with a second medium opening 121 and an annular retaining edge 122.

[0033] For valve core 2 mentioned above, please refer to Figures 2-5The valve core 2 includes a sliding sleeve 21, a first valve stem 22, a second valve stem 23, a first elastic element 24, a first sealing element 25, and a second sealing element 26. The sliding sleeve 21 is provided with a through-hole 211, a sliding portion 212, and a connecting groove 213. The through-hole 211 is located on the side wall of the sliding sleeve 21, penetrating a portion of the side wall, and is used to assemble the first valve stem 22, the second valve stem 23, and the first elastic element 24 onto the sliding sleeve 21. The sliding portion 212 is located at one end of the sliding sleeve 21 and is slidably disposed in the sliding groove 111, allowing the sliding sleeve 21 to move along the sliding groove 111 between a first position, a second position, and a third position. In this embodiment, there are two sliding portions 212, one slidably disposed in one sliding groove 111. The connecting groove 213 is located on the sliding portion 212, and allows a portion of the actuator 3 to pass through and connect to the sliding sleeve 21. In this embodiment, there are two connecting slots 213, which are arranged opposite to each other. The first valve stem 22 is located inside one end of the sliding sleeve 21, and one end of the first valve stem 22 extends out of one end of the sliding sleeve 21. The first valve stem 22 is provided with a first stepped surface 221 and a receiving groove 222. The first stepped surface 221 is located at one end of the first valve stem 22, such as... Figure 2 As shown, when the sliding sleeve 21 is in the first position, there is a first gap a between the first wall surface of the opening 211 and the first step surface 221, such as... Figure 3 and Figure 4 As shown, when the sliding sleeve 21 is in the second and third positions, the first wall surface abuts against the first stepped surface 221. A receiving groove 222 is provided at the other end of the first valve stem 22. The second valve stem 23 is provided inside the other end of the sliding sleeve 21, with one end of the second valve stem 23 extending out of the other end of the sliding sleeve 21. The second valve stem 23 is provided with a second stepped surface 231 and a connecting post 232. The second stepped surface 231 is provided at one end of the second valve stem 23, as shown... Figure 2 and Figure 3 As shown, when the sliding sleeve 21 is in the first position and the second position, the second step surface 231 abuts against the second wall surface of the opening 211, as... Figure 4 As shown, when the sliding sleeve 21 is in the third position, there is a second gap b between the second step surface 231 and the second wall surface of the through-hole 211, and the second wall surface is opposite to the first wall surface. The sleeve post 232 is located inside the other end of the second valve stem 23, and the sleeve post 232 is provided with an abutment portion 2321, which surrounds the end of the sleeve post 232 away from the receiving groove 222. One end of the first elastic member 24 is received in the receiving groove 222, and one end of the first elastic member 24 is connected to the bottom of the receiving groove 222. The other end of the first elastic member 24 is sleeved on the sleeve post 232, and the other end of the first elastic member 24 is connected to the abutment portion 2321. The first sealing member 25 is fixed to one end of the first valve stem 22. The second sealing member 26 is fixed to the other end of the second valve stem 23, wherein, as Figure 2As shown, when the sliding sleeve 21 is in the first position, the first seal 25 closes the first medium opening 112, and the second seal 26 opens the second medium opening 121, as... Figure 3 As shown, when the sliding sleeve 21 is in the second position, the first seal 25 closes the first medium opening 112, and the second seal 26 closes the second medium opening 121, as... Figure 4 As shown, when the sliding sleeve 21 is in the third position, the first seal 25 opens the first medium opening 112, and the second seal 26 closes the second medium opening 121.

[0034] In some embodiments, the first elastic element 24 is a spring.

[0035] For actuator 3 mentioned above, please refer to Figures 2-4 and Figure 6 The actuator 3 includes an SMA element 31 and a second elastic element 32. There are two SMA elements 31, arranged opposite each other. The middle of one SMA element 31 is connected to the bottom of the connecting groove 213, so that one SMA element 31 is connected to the sliding sleeve 21. The two ends of one SMA element 31 are located opposite each other on both sides of the groove of the sliding sleeve 21, and both ends of one SMA element 31 are connected to the circuit board 13. When powered by the circuit board 13, the SMA element 31 deforms, actuating the sliding sleeve 21 to move along the sliding groove 111, from a first position to a second position, and then to a third position. One end of the second elastic member 32 is sleeved on the other end of the sliding sleeve 21, and one end of the second elastic member 32 is connected to the sliding part 212. The other end of the second elastic member 32 is sleeved on the annular stop 122, and the other end of the second elastic member 32 is connected to the bottom wall of the valve cavity 14. When the circuit board 13 disconnects the power to the SMA element 31, the SMA element 31 returns to its original state. Under the action of the second elastic member 32, the sliding sleeve 21 moves along the sliding groove 111, from the third position to the second position, and then to the first position.

[0036] It is understood that, in some embodiments, please refer to Figure 7 The SMA element 31 and the sliding sleeve 21 are not limited to the above structure. The SMA element 31 and the sliding sleeve 21 can be other structures. For example, two connecting grooves 213 are located opposite each other on both sides of the sliding sleeve 21. There are two SMA elements 31, which are located opposite each other on both sides of the sliding sleeve 21. The two ends of one SMA element 31 are connected to the circuit board 13 (that is, the two ends of one SMA element 31 are both located on one side of the sliding sleeve 21 and connected to the circuit board 13, and the two ends of the other SMA element 31 are both located on the other side of the sliding sleeve 21 and connected to the circuit board 13). The middle part of one SMA element 31 is connected to a connecting groove 213.

[0037] It is understood that, in some embodiments, please refer to Figure 8The SMA element 31 and the sliding sleeve 21 are not limited to the above structure. The SMA element 31 and the sliding sleeve 21 can be other structures. For example, the sliding sleeve 21 is provided with a hook 214, the number of SMA elements 31 is one, the two ends of the SMA are located on one side of the sliding sleeve 21, both ends of the SMA element 31 are connected to the circuit board 13, and the middle part of the SMA element 31 bypasses two connecting grooves 213 and connects to the hook 214. Furthermore, the hook 214 is provided on the bottom wall of the valve cavity 14.

[0038] In some embodiments, the second elastic element 32 is a spring.

[0039] In this embodiment of the invention, the valve assembly 100 includes a valve body 1, a valve core 2, and an actuator 3. The valve body 1 includes a circuit board 13 and has a valve cavity 14. The valve body 1 has a first medium opening 112, a second medium opening 121, and a third medium opening 113 communicating with the valve cavity 14. The valve core 2 includes a sliding sleeve 21, a first valve stem 22, a second valve stem 23, and a first elastic element 24. The sliding sleeve 21 is disposed in the valve cavity 14. The first valve stem 22 is located at one end of the sliding sleeve 21, and the second valve stem 23 is located at the other end of the sliding sleeve 21. The first elastic element 24 is connected to the first valve stem 22 and the second valve stem 23. Actuator 3 is connected to circuit board 13. Actuator 3 is used to actuate the sliding sleeve 21 to move between a first position, a second position and a third position. When the sliding sleeve 21 is in the first position, the first valve stem 22 closes the first medium opening 112 and the second valve stem 23 opens the second medium opening 121. When the sliding sleeve 21 is in the second position, the first valve stem 22 closes the first medium opening 112 and the second valve stem 23 closes the second medium opening 121. When the sliding sleeve 21 is in the third position, the first valve stem 22 opens the first medium opening 112 and the second valve stem 23 closes the second medium opening 121. As can be seen from the above, under the action of actuator 3 actuating the sliding sleeve 21 and the first elastic element 24, the first valve stem 22 closes the first medium opening 112 and the second valve stem 23 opens the second medium opening 121, the first valve stem 22 closes the first medium opening 112 and the second valve stem 23 closes the second medium opening 121, and the first valve stem 22 opens the first medium opening 112 and the second valve stem 23 closes the second medium opening 121. This avoids the simultaneous occurrence of the first valve stem 22 opening the first medium opening 112 and the second valve stem 23 opening the second medium opening 121, thus ensuring the air pump's supply pressure to other air bags and preventing any impact on the air supply efficiency of other air bags.

[0040] The present invention also provides an embodiment of a pneumatic massage system, which includes an air pump, an air bag, and the valve assembly 100 described above. The air pump is connected to the first medium opening 112 of the valve assembly 100, and the air bag is connected to the third medium opening 113 of the valve assembly 100. The structure and function of the valve assembly 100 can be referred to the above embodiments, and will not be described in detail here.

[0041] The present invention also provides an embodiment of a seat, which includes the aforementioned pneumatic massage system. The structure and function of the pneumatic massage system can be found in the above embodiments and will not be repeated here. The seat can be applied to transportation vehicles such as automobiles, ships, or aircraft.

[0042] It should be noted that while the preferred embodiments of the present invention are given in the specification and accompanying drawings, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of the present invention; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of the present invention specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A valve assembly, characterized in that, include: A valve body, including a circuit board, has a valve cavity and is provided with a first medium opening, a second medium opening and a third medium opening communicating with the valve cavity; The valve core includes a sliding sleeve, a first valve stem, a second valve stem, and a first elastic element. The sliding sleeve is disposed in the valve cavity. The first valve stem is located at one end of the sliding sleeve, and the second valve stem is located at the other end of the sliding sleeve. The first elastic element is connected to the first valve stem and the second valve stem. An actuator, connected to the circuit board, is used to actuate the sliding sleeve to move between a first position, a second position, and a third position; Specifically, when the sliding sleeve is in the first position, the first valve stem closes the first medium opening and the second valve stem opens the second medium opening; when the sliding sleeve is in the second position, the first valve stem closes the first medium opening and the second valve stem closes the second medium opening; when the sliding sleeve is in the third position, the first valve stem opens the first medium opening and the second valve stem closes the second medium opening. The first valve stem is located inside one end of the sliding sleeve, and one end of the first valve stem extends out of one end of the sliding sleeve. The sliding sleeve is provided with a through port, and one end of the first valve stem is provided with a first stepped surface. When the sliding sleeve is in the first position, there is a first gap between the first wall surface of the through port and the first stepped surface. When the sliding sleeve is in the second position and the third position, the first wall surface abuts against the first stepped surface. The second valve stem is located inside the other end of the sliding sleeve, and one end of the second valve stem extends out of the other end of the sliding sleeve. One end of the second valve stem is provided with a second stepped surface. When the sliding sleeve is in the first position and the second position, the second stepped surface abuts against the second wall surface of the through-hole. When the sliding sleeve is in the third position, there is a second gap between the second stepped surface and the second wall surface, and the second wall surface is opposite to the first wall surface. The inner wall of the valve cavity is provided with a sliding groove, and the sliding sleeve is slidably disposed in the sliding groove; The other end of the first valve stem is provided with a receiving groove, the other end of the second valve stem is provided with a sleeve post, one end of the first elastic element is received in the receiving groove, and the other end of the elastic element is sleeved on the sleeve post.

2. The valve assembly according to claim 1, characterized in that, The actuator includes an SMA element and a second elastic element. The SMA element is connected to the circuit board and the sliding sleeve, and the second elastic element is connected to the sliding sleeve and the bottom wall of the valve chamber.

3. The valve assembly according to claim 2, characterized in that, The SMA element is two in number, and the two SMA elements are arranged opposite each other. The middle part of one SMA element is connected to the sliding sleeve, and the two ends of the other SMA element are respectively located on both sides of the sliding sleeve. Both ends of the other SMA element are connected to the circuit board.

4. The valve assembly according to claim 2, characterized in that, The SMA element is two in number, and the two SMA elements are located opposite each other on both sides of the sliding sleeve. Both ends of one SMA element are connected to the circuit board, and the middle part of the other SMA element is connected to the sliding sleeve.

5. The valve assembly according to claim 2, characterized in that, The SMA element is one in number, with both ends of the SMA element located on one side of the sliding sleeve. Both ends of the SMA element are connected to the circuit board, and the middle part of the SMA element is connected to the sliding sleeve around it.

6. A pneumatic massage system, characterized in that, It includes an air pump, an air bag, and a valve assembly as described in any one of claims 1-5, wherein the air pump is in communication with a first medium opening of the valve assembly, and the air bag is in communication with a third medium opening of the valve assembly.

7. A type of seat, characterized in that, Includes the pneumatic massage system as described in claim 6.

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