Pneumatic valve device and pneumatic comfort system
By using a pneumatic valve device to achieve pneumatic circuit control through the mechanical structure of a piston and a self-locking switch, the problems of complex structure and electrical control in existing pneumatic systems are solved, and low-cost, quiet and stable pneumatic circuit control is achieved.
Patent Information
- Application Number
- CN202423174178.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The control valves in existing pneumatic systems have complex structures, high manufacturing costs, and heat generation issues on the circuit boards, affecting heat dissipation requirements.
A pneumatic valve device is adopted, which uses the air pressure difference to switch the opening and closing of the ventilation component by the axial movement of the piston in the housing. Combined with a self-locking switch, it realizes the pressure holding and pressure relief functions, avoiding the need for an electronic control structure.
The simplified structure reduces manufacturing costs, provides quiet operation, reduces heat generation, and improves operational stability.
Smart Images
Figure CN223622375U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pneumatic valve technology, and in particular to a pneumatic valve device and a pneumatic comfort system. Background Technology
[0002] In pneumatic systems, control valves are typically used to directly control the opening and closing of the air path. Existing control valves include solenoid valves, SMA valves, or other types of electrically controlled valves. Currently, most commonly used control valves are electrically controlled valves, which require a PCB circuit board for control. This results in a more complex structure for the entire valve assembly, higher manufacturing costs, and the problem of heat generation on the circuit board, which also places certain requirements on the heat dissipation of the pneumatic system. Utility Model Content
[0003] This application provides a pneumatic valve device and a pneumatic comfort system, which can at least effectively solve one of the above-mentioned problems.
[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application embodiment is: providing a pneumatic valve device, including a housing, a piston assembly, and a venting assembly. The housing has a receiving cavity, an air inlet, and an air outlet, which respectively connect the receiving cavity to the outside. The piston assembly is movably disposed within the receiving cavity to divide the receiving cavity into a first chamber and a second chamber. The first chamber is connected to the air inlet, and the second chamber is connected to the air outlet. The piston assembly includes a piston, which has a first position and a second position in the axial direction of the housing, and the piston is movable between the first position and the second position. The piston has an air inlet channel that connects the first chamber and the second chamber. The venting assembly is disposed on the piston and has an open state (opening the air inlet channel) and a closed state (closing the air inlet channel). The venting assembly abuts against the housing to switch between the open and closed states. When the piston is in the first position, the venting assembly is in the closed state, and at least when the piston is in the second position, the venting assembly is in the open state.
[0005] In some embodiments, the venting assembly includes a push rod and a first plug. The push rod is movably disposed on the piston and has a first end and a second end opposite to each other. The first plug is disposed on the first end of the push rod. The first plug is in a closed state when it blocks the air intake passage and in an open state when it opens the air intake passage. The second end of both the first plug and the push rod is configured to abut against the housing to drive the push rod to move relative to the piston.
[0006] In some embodiments, the piston has at least one first protrusion on the side facing the air inlet, or the first chamber of the housing has at least one first protrusion, the first protrusion being configured to abut against the piston, and the piston and the housing being spaced apart by the first protrusion.
[0007] In some embodiments, the piston is provided with a first guide portion and the housing is provided with a second guide portion. The first guide portion and the second guide portion are connected in cooperation, and the piston reciprocates in the axial direction within the receiving cavity.
[0008] In some embodiments, the venting assembly includes a first seal disposed on the piston and surrounding the port of the air intake passage, the first seal being configured to seal the gap between the piston and the first plug body when the first plug body is in a closed state; and / or, the piston assembly includes a second seal disposed radially outward of the piston and moving synchronously with the piston, the second seal being configured to simultaneously abut against the piston and the housing, sealing the gap between the piston and the housing.
[0009] In some embodiments, the piston assembly includes an elastic element that connects the piston and the housing respectively, and the elastic element is configured to provide a reset force to the piston to drive the piston from a second position to a first position.
[0010] In some embodiments, the housing is provided with a pressure relief port communicating with the second chamber; the piston assembly includes a switching switch disposed on the side of the piston facing the pressure relief port. The switching switch is a self-locking switch, capable of remaining in a retracted state with the pressure relief port open, or in an extended state with the pressure relief port closed. When the piston approaches the second position, the piston drives the switching switch to abut against the inner wall of the housing to apply a switching force to the switching switch, causing the switching switch to switch from the retracted state to the extended state or from the extended state to the retracted state.
[0011] In some embodiments, the switching switch includes a main body and a second plug, the main body being fixed to the piston and the second plug being movably disposed in the main body. The second plug is configured to extend from the main body to block the pressure relief port or retract within the main body to open the pressure relief port.
[0012] In some embodiments, the first plug body has a second protrusion on the side away from the push rod, or the housing has a second protrusion, and the second protrusion is correspondingly disposed with the first plug body; the radial dimension of the second protrusion is smaller than the radial dimension of the first plug body, and the first plug body and the housing are spaced apart by the second protrusion.
[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application embodiment is: to provide a pneumatic comfort system, including an air source, an air bag and a pneumatic valve device, wherein the air source is connected to the air inlet and the air bag is connected to the air outlet.
[0014] The beneficial effects of this application's embodiments are as follows: The pneumatic valve device of this application movably mounts a piston within a housing along its axial direction. Utilizing the gas pressure difference on both sides of the piston along its axial direction, the piston can reciprocate within the housing. By opening an air intake channel on the piston and movably mounting a venting component on the piston, the movement of the piston and the contact action between the venting component and the housing are cleverly used to achieve the function of opening or closing the air intake channel. Furthermore, a self-locking switch is provided on the piston. During the piston's movement relative to the housing, the housing contacts the switch, applying a pressing force to the switch, allowing it to open or close the pressure relief port, thus realizing the pressure holding and pressure relief functions of the pneumatic valve device.
[0015] Compared to existing technologies that use solenoid valves to control the airflow or shut-off of the valve body, the pneumatic valve device of this application is a purely mechanical structure. It utilizes the pneumatic power of the air passage to achieve opening and closing. The structure is simplified yet ingenious, eliminating the need for complex circuit boards for control. Its control logic is also very simple, enabling stable control of the air passage's opening and closing. Furthermore, the simple component structure facilitates assembly and reduces manufacturing costs. In addition, compared to the impact noise of the iron core in a solenoid valve, the piston and housing, as well as the piston and airflow assembly in the pneumatic valve device of this application, are all slidingly fitted, resulting in almost no noise during the airflow and shut-off process, providing better noise reduction. Moreover, since the pneumatic valve device of this application does not include circuit boards, electromagnets, or other electronic control structures, the heat generated by the piston and airflow assembly during movement is low, effectively reducing or eliminating the safety hazard of overheating during operation and making its operation more stable. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0017] Figure 1 This is a schematic diagram of the pneumatic valve device according to an embodiment of this application;
[0018] Figure 2 This is an exploded view of the pneumatic valve device according to an embodiment of this application;
[0019] Figure 3 This is a partial cross-sectional view of the pneumatic valve device according to an embodiment of this application;
[0020] Figure 4 This is a cross-sectional view of the piston and ventilation assembly of the pneumatic valve device according to an embodiment of this application;
[0021] Figure 5This is a cross-sectional view of the pneumatic valve device according to an embodiment of this application, showing the first guide portion and the second guide portion;
[0022] Figure 6 This is a cross-sectional view of the pneumatic valve device in the venting state according to an embodiment of this application;
[0023] Figure 7 This is a cross-sectional view of the pneumatic valve device in the inflated state according to an embodiment of this application;
[0024] Figure 8 This is a cross-sectional view of the pneumatic valve device in the pressure-holding state according to an embodiment of this application. Detailed Implementation
[0025] To facilitate understanding of this application, 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 "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 "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 "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] 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 application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0027] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0028] Please see Figures 1 to 3The pneumatic valve device 100 of this application embodiment includes a housing 10, a piston assembly 20, and a venting assembly 30. The housing 10 is provided with a receiving cavity 11, an air inlet 12, and an air outlet 13. The air inlet 12 and the air outlet 13 respectively connect the receiving cavity 11 to the outside. The piston assembly 20 is movably disposed in the receiving cavity 11 to divide the receiving cavity 11 into a first chamber 111 and a second chamber 112, wherein the first chamber 111 communicates with the air inlet 12, and the second chamber 112 communicates with the air outlet 13.
[0029] Piston assembly 20 includes piston 21, which is movably disposed inside housing 10, such as... Figure 6 and Figure 7 As shown, piston 21 has a first position M1 and a second position M2 in the axial direction of housing 10, and piston 21 can reciprocate between the first position M1 and the second position M2. Figure 3 and Figure 4 As shown, the piston 21 is provided with an air intake channel 211, which connects the first chamber 111 and the second chamber 112, so that gas in the first chamber 111 can enter the second chamber 112 through the air intake channel 211. It can be understood that the air inlet 12 is used to connect with an external air source, and the air outlet 13 is used to connect with an external air bag. The air source inflates the air bag through the pneumatic valve device 100.
[0030] like Figure 6 and Figure 7 As shown, the venting assembly 30 is disposed on the piston 21. The venting assembly 30 can move synchronously with the piston 21 and can move relative to the piston 21, so that the venting assembly 30 has an open state Q1 with the air intake passage 211 open and a closed state Q2 with the air intake passage 211 closed. During the movement of the piston 21 relative to the housing 10, the venting assembly 30 abuts against the housing 10 to switch between the open state Q1 and the closed state Q2. When the piston 21 is in the first position M1, the venting assembly 30 is in the closed state Q2, and gas exchange cannot occur between the first chamber 111 and the second chamber 112; when at least the piston 21 is in the second position M2, the venting assembly 30 is in the open state Q1, and gas exchange can occur between the first chamber 111 and the second chamber 112.
[0031] In this embodiment, the pneumatic valve device 100 uses the movement of the piston 21 relative to the housing 10 to switch the venting component 30 between an open state Q1 and a closed state Q2, thereby opening or closing the air intake channel 211 and enabling the pneumatic valve device 100 to perform either an inflation or pressure holding function. Compared to the prior art that uses a solenoid valve structure to control the air supply or de-airing of the valve body, the pneumatic valve device 100 in this embodiment is a purely mechanical structure that uses the pneumatic power of the air passage to achieve the switching between opening and closing. The structure is simplified yet ingenious, requiring no complex circuit board for control. Its control logic is also very simple, enabling stable control of the opening and closing of the air passage. Furthermore, the components are simple in structure, easy to assemble, and have lower manufacturing costs.
[0032] It is worth noting that, at least when the piston 21 is in the second position M2, the venting assembly 30 being in the open state Q1 means that, during the movement of the piston 21 from the first position M1 to the second position M2, before it fully reaches the second position M2, the end of the venting assembly 30 may have already come into contact with the housing 10. The housing 10 acts as a barrier to the venting assembly 30, allowing the venting assembly 30 to move relative to the piston 21 to open the intake passage 211. This can be considered as the venting assembly 30 switching from the closed state Q2 to the open state Q1. When the piston 21 is in the second position M2, the venting assembly 30 is necessarily in the open state Q1.
[0033] In some embodiments, please refer to Figure 3 and Figure 4 The ventilation assembly 30 includes a push rod 31 and a first plug 32. The push rod 31 is movably disposed on the piston 21 and can move synchronously with or relative to the piston 21. The push rod 31 has a first end and a second end opposite to each other. The first end of the push rod 31 is located in the first chamber 111, and the second end of the push rod 31 is located in the second chamber 112. The first plug 32 is disposed on the first end of the push rod 31 and moves synchronously with the push rod 31. When the first plug 32 blocks the air intake passage 211, it is in a closed state Q2, and airflow cannot pass through the air intake passage 211; when the first plug 32 opens the air intake passage 211, it is in an open state Q1, and airflow can pass through the air intake passage 211. The second ends of both the first plug 32 and the push rod 31 are configured to abut against the housing 10 to drive the push rod 31 to move relative to the piston 21.
[0034] As an example, such as Figure 6 and Figure 7As shown, in the initial state, piston 21 is in the first position M1, first plug 32 is in the closed state Q2, and the second end of push rod 31 is spaced apart from housing 10. When external high-pressure airflow enters the first chamber 111 from air inlet 12, the air pressure in the first chamber 111 is greater than the air pressure in the second chamber 112. Under the action of the air pressure difference, piston 21 is pushed to move from the first position M1 to the second position M2. Since the second end of the push rod 31 is spaced apart from the housing 10, the housing 10 does not block the push rod 31, allowing the push rod 31 to move synchronously with the piston 21 until the second end of the push rod 31 abuts against the inner wall of the housing 10. At this time, the piston 21 has not yet moved to the second position M2. Under the action of the air pressure difference, the piston 21 continues to move towards the second position M2. Under the abutting action of the housing 10, the push rod 31 moves relative to the piston 21. The first plug 32 moves synchronously with the push rod 31 to switch from the closed state Q2 to the open state Q1. The air intake channel 211 is in the open state, and the gas in the first chamber 111 can flow from the air intake channel 211 to the second chamber 112, and then flow from the air outlet 13 to the air bag in the outside, thus inflating the air bag.
[0035] When the air bag is fully inflated and the air source stops working, the gas pressure in the first chamber 111 is less than the gas pressure in the second chamber 112. Under the action of the gas pressure difference, the piston 21 is pushed to move from the second position M2 to the first position M1. At this time, the end of the first plug 32 is spaced apart from the housing 10, and the housing 10 does not block the first plug 32, so that the push rod 31 and the first plug 32 move synchronously with the piston 21 until the first plug 32 comes into contact with the housing 10. Under the action of the gas pressure difference, the piston 21 continues to move towards the first position M1. Under the blocking action of the housing 10, the first plug 32 and the push rod 31 move relative to the piston 21. The first plug 32 switches from the open state Q1 to the closed state Q2, the air intake channel 211 is closed, and the first chamber 111 and the second chamber 112 no longer exchange gas, thus maintaining the pressure of the air bag.
[0036] In some embodiments, please refer to Figure 4 The venting assembly 30 includes a first seal 33 disposed on the piston 21 and surrounding the port of the intake passage 211. The first seal 33 is configured to abut against the first plug 32 when the first plug body 32 is in the closed state Q2, thereby sealing the gap between the piston 21 and the first plug body 32 and improving the airtightness of the intake passage 211. As an example, the first seal 33 may be a rubber ring.
[0037] In some embodiments, please refer to Figure 4 and Figure 6The piston 21 has at least one first protrusion 212 on the side facing the air inlet 12, and the piston 21 and the inner wall of the housing 10 are spaced apart by the first protrusion 212. By providing the first protrusion 212 on the surface of the piston 21, the piston 21 in the first position M1 is supported relative to the inner wall of the housing 10. This helps to increase the surface area of the piston 21 exposed in the first chamber 111. When high-pressure gas is introduced into the first chamber 111, the high-pressure gas can act more evenly on the surface of the piston 21, so as to push the piston 21 from the first position M1 to the second position M2 along the axial direction of the piston 21. The movement is smoother and the probability of the piston 21 jamming is reduced.
[0038] It is understood that in other embodiments, at least one first protrusion 212 is provided in the first chamber 111 of the housing 10. The first protrusion 212 is used to abut against the piston 21 to space the piston 21 from the inner wall surface of the housing 10. Of course, in other embodiments, at least one first protrusion 212 may also be provided on the surface of the piston 21 facing the second chamber 112, or at least one first protrusion 212 may be provided on the inner wall of the second chamber 112 of the housing 10, so that the piston 21 is also spaced from the housing 10 in the second position M2. This is beneficial for the gas in the second chamber 112 to act evenly on the surface of the piston 21, so that the piston 21 moves more smoothly from the second position M2 to the first position M1.
[0039] In some embodiments, please refer to Figure 5 The piston 21 is provided with a first guide portion 213, and the housing 10 is provided with a second guide portion 14. The first guide portion 213 and the second guide portion 14 are connected to each other to further improve the smoothness of the piston 21's reciprocating guided movement in the axial direction within the receiving cavity 11. As one example, the first guide portion 213 is a guide post, and the second guide portion 14 is a guide groove. The guide post is inserted into the guide groove to provide guidance for the movement of the piston 21. In other examples, the first guide portion 213 may be a guide groove, and the second guide portion 14 may be a guide post.
[0040] In some embodiments, please refer to Figure 3 and Figure 4 The piston assembly 20 includes a second seal 22, which is disposed radially outside the piston 21 and moves synchronously with the piston 21. The second seal 22 is configured to simultaneously abut against the piston 21 and the housing 10 to seal the gap between the piston 21 and the housing 10, thereby improving the airtightness between the first chamber 111 and the second chamber 112. As an example, the second seal 22 may be a rubber ring.
[0041] In some embodiments, please refer to Figure 6The piston assembly 20 includes an elastic element 23, which connects the piston 21 and the housing 10. The elastic element 23 is configured to provide a reset force to the piston 21 to drive the piston 21 from the second position M2 to the first position M1, thereby making the reset movement of the piston 21 smoother. As an example, the elastic element 23 is a spring, located on the side of the piston 21 facing the first chamber 111. When the piston 21 moves from the first position M1 to the second position M2, the spring is stretched. After the air bag is inflated, the spring provides a pulling force to the piston 21 to drive the piston 21 back from the second position M2 to the first position M1. As another example, the elastic element 23 is a spring, located on the side of the piston 21 facing the second chamber 112. When the piston 21 moves from the first position M1 to the second position M2, the spring is compressed. After the air bag is inflated, the spring provides a pushing force to the piston 21 to drive the piston 21 back from the second position M2 to the first position M1. Of course, in other examples, the elastic element 23 can be provided only on one side of the piston 21, or the elastic element 23 can be provided on both sides of the piston 21.
[0042] In some embodiments, please refer to Figure 2 , Figure 6 and Figure 7 The housing 10 is provided with a pressure relief port 15, which communicates with the second chamber 112. The pressure relief port 15 is configured to discharge gas from the air bag to the outside, thereby depressurizing the air bag. The piston assembly 20 includes a switching switch 24, which is located on the side of the piston 21 facing the pressure relief port 15. The switching switch 24 is a self-locking switch, which can be held in the contracted state P1 with the pressure relief port 15 open, and in the extended state P2 with the pressure relief port 15 closed. Applying a force to the switching switch 24 can switch the switching switch 24 between the contracted state P1 and the extended state P2.
[0043] When piston 21 approaches the second position M2, piston 21 drives switch 24 to abut against the inner wall of housing 10. When piston 21 continues to move to the second position M2, housing 10 applies a switching force to switch 24, causing switch 24 to switch from retracted state P1 to extended state P2, or from extended state P2 to retracted state P1.
[0044] Specifically, when the switch 24 is in the retracted state P1, the pressure relief port 15 is opened to connect the second chamber 112 with the outside. At this time, the air bag is connected to the second chamber 112 through the air outlet 13. Therefore, the gas in the air bag can enter the second chamber 112 through the air outlet 13 and then be discharged to the outside through the pressure relief port 15 to relieve the pressure of the air bag. When the switch 24 is in the extended state P2, the pressure relief port 15 is closed. The air bag is only connected to the second chamber 112 and not to the outside. The air bag can be in a pressure-holding state.
[0045] In some embodiments, the toggle switch 24 is a push-button self-locking switch, which can be switched between the retracted state P1 and the extended state P2 by applying a pressing force. As an example, such as Figure 6 and Figure 7 As shown, the switching switch 24 includes a main body 241 and a second plug 242. The main body 241 is fixed to the piston 21 to move synchronously with the piston 21, and the second plug 242 is movably disposed in the main body 241. The second plug 242 is configured to retract within the main body 241 to open the pressure relief port 15 to be in a retracted state P1, or to extend from the main body 241 to block the pressure relief port 15 to be in an extended state P2.
[0046] By adding a switching switch 24 to the piston 21, pressure holding and depressurization of the air bag can be achieved. When the piston 21 switches between the first position M1 and the second position M2, it drives the ventilation assembly 30 to switch between the open state Q1 and the closed state Q2, and drives the switching switch 24 to switch between the contracted state P1 and the extended state P2, thereby enabling the pneumatic valve device 100 to have a depressurization state, an inflation state, and a pressure holding state.
[0047] Please see Figures 6 to 8 The following describes the switching process of the pneumatic valve device 100 between three states, with the pneumatic valve device 100 in the deflated state as the initial state.
[0048] In the initial state (deflated state), such as Figure 6 As shown, piston 21 is in the first position M1, first plug 32 is in the closed state Q2, and second plug 242 is in the retracted state P1. Please refer to the following: Figure 7 When high-pressure gas is introduced into the first chamber 111, the piston 21 moves from the first position M1 to the second position M2. The first plug 32 follows the piston 21 to switch from the closed state Q2 to the open state Q1, opening the air intake passage 211. The gas in the first chamber 111 flows through the air intake passage 211 to the second chamber 112, and then enters the air bag through the air outlet 13 to achieve inflation. When the piston 21 moves to the second position M2, the second plug 242 of the switching switch 24 abuts against the housing 10 and blocks the pressure relief port 15. The housing 10 applies a force to the second plug 242 to trigger the switching switch 24 to switch from the contracted state P1 to the extended state P2. The second plug 242 remains blocking the pressure relief port 15. At this time, the pneumatic valve device 100 switches from the initial state (deflated state) to the inflation state. Please refer to [link to relevant documentation]. Figure 7 and Figure 8When gas is stopped being supplied to the first chamber 111, under the pressure difference between the first chamber 111 and the second chamber 112, the piston 21 moves back from the second position M2 to the first position M1. The main body 241 of the switch 24 moves synchronously with the piston 21, while the second plug 242 moves relative to the main body 241 to keep the pressure relief port 15 blocked. When the piston 21 approaches the first position M1, the housing 10 abuts against the first plug 32, causing the first plug 32 to switch from the open state Q1 to the closed state Q2. The air intake passage 211 is blocked, and the first chamber 111 and the second chamber 112 are not connected until the piston 21 returns to the first position M1. At this time, the pneumatic valve device 100 switches from the charging state to the pressure holding state.
[0049] Please refer to the following in order. Figure 8 and Figure 7 When it is necessary to depressurize the air bag, high-pressure gas can be introduced into the first chamber 111 again, pushing the piston 21 from the first position M1 to the second position M2. The first plug 32 switches from the closed state Q2 to the open state Q1. When the piston 21 moves to the second position M2, the housing 10 applies a force to the second plug 242, causing the switch 24 to switch from the extended state P2 to the retracted state P1. Please refer to the following in sequence. Figure 7 and Figure 6 When gas is stopped being supplied to the first chamber 111, under the pressure difference between the first chamber 111 and the second chamber 112, the piston 21 moves back from the second position M2 to the first position M1. The main body 241 and the second plug 242 of the switching switch 24 move synchronously with the piston 21, and the second plug 242 opens the pressure relief port 15. When the piston 21 approaches the first position M1, the housing 10 abuts against the first plug 32, causing the first plug 32 to switch from the open state Q1 to the closed state Q2. The air intake passage 211 is blocked, and the first chamber 111 and the second chamber 112 are not connected. The gas in the air bag can only be discharged to the outside through the pressure relief port 15 until the piston 21 returns to the first position M1. At this time, the pneumatic valve device 100 switches from the pressure holding state to the air venting state (initial state).
[0050] Compared to existing technologies that use solenoid valves and circuit boards to inflate and depressurize air bags, the production cost of solenoid valves and circuit boards is high, assembly requirements are demanding, and they generate heat during operation, placing high demands on the heat dissipation of the entire pneumatic structure. The pneumatic valve device 100 in this embodiment uses the coordinated movement of a piston 21, pneumatic components, and a switching switch 24 to inflate, maintain, and depressurize the air bag. This design is simple, easy to assemble, and helps reduce production costs. Furthermore, the heat generated by this structure is low, reducing the heat dissipation requirements of the entire pneumatic structure.
[0051] In some embodiments, please refer to Figure 6 and Figure 7A second protrusion 321 is provided on the side of the first plug 32 away from the push rod 31. The radial dimension of the second protrusion 321 is smaller than the radial dimension of the first plug 32. The first plug 32 and the housing 10 are spaced apart by the second protrusion 321. By providing the second protrusion 321 at the end of the first plug 32, when the piston 21 is in the first position M1, the second protrusion 321 supports the first plug 32 relative to the housing 10. When a high-pressure airflow is introduced into the first chamber 111, the force of the high-pressure airflow can be evenly distributed on the surface of the piston 21 and the surface of the first plug 32, thereby driving the first plug 32 and the push rod 31 to move synchronously with the piston 21. This helps reduce the probability that the first plug 32 will not be pushed by the high-pressure gas and move relative to the piston 21 in the early stage of piston 21 movement, thus causing the first plug 32 to switch from the closed state Q2 to the open state Q1 too early. The air intake channel 211 connects the first chamber 111 and the second chamber 112, so that the gas in the first chamber 111 flows directly to the second chamber 112. The pushing force of the gas on the piston 21 is weakened, the piston 21 cannot reach the second position M2, and the housing 10 cannot press the switching switch 24 to switch it between the contracted state P1 and the extended state P2.
[0052] It is understandable that in other examples, the housing 10 may also have a second protrusion 321, which is correspondingly provided with the first plug 32. The radial dimension of the second protrusion 321 is smaller than the radial dimension of the first plug 32. The first plug 32 and the housing 10 are spaced apart by the second protrusion 321, so that a part of the surface of the first plug 32 is exposed in the first chamber 111.
[0053] This application further provides an embodiment of a pneumatic comfort system, which includes an air source, an air bag, and a pneumatic valve device 100 as described in any of the above embodiments. The air source is connected to the air inlet 12 of the pneumatic valve device 100, and the air source is configured to supply a high-pressure airflow to the pneumatic valve device 100 through the air inlet 12. The air bag is connected to the air outlet 13 of the pneumatic valve device 100, enabling the pneumatic valve device 100 to inflate, maintain, or depressurize the air bag. For the specific structure and function of the pneumatic valve device 100, please refer to the above embodiments; further details are omitted here.
[0054] The pneumatic valve device 100 of this application embodiment includes a housing 10, a piston assembly 20, and a venting assembly 30. The pneumatic valve device 100 movably mounts a piston 21 within the housing 10 along the axial direction. The piston 21 reciprocates within the housing 10 due to the gas pressure difference on both sides of the piston 21 along the axial direction. An air intake channel 211 is provided on the piston 21, and the venting assembly 30 is movably mounted on the piston 21. The movement of the piston 21 and the contact between the venting assembly 30 and the housing 10 are cleverly utilized to open or close the air intake channel 211. Furthermore, a self-locking switch 24 is provided on the piston 21. During the movement of the piston 21 relative to the housing 10, the housing 10 contacts the switch 24, applying a pressing force to the switch 24, allowing the switch 24 to open or close the pressure relief port 15, thus realizing the pressure holding and pressure relief functions of the pneumatic valve device 100.
[0055] Compared to existing technologies that use solenoid valves to control the airflow or shut-off of the valve body, the pneumatic valve device 100 in this embodiment is a purely mechanical structure. It utilizes the pneumatic power of the air passage to achieve opening and closing. The structure is simplified yet ingenious, eliminating the need for complex circuit boards for control. Its control logic is also very simple, enabling stable control of the air passage's opening and closing. Furthermore, the simple component structure facilitates assembly and reduces manufacturing costs. In addition, compared to the impact noise of the iron core in a solenoid valve, the piston 21 and housing 10, as well as the piston 21 and air passage assembly 30 in this embodiment, are all slidingly fitted, resulting in almost no noise during the airflow and shut-off switching process, providing better noise reduction. Moreover, since the pneumatic valve device 100 in this embodiment does not include circuit boards, electromagnets, or other electronic control structures, the heat generated by the piston 21 and air passage assembly 30 during movement is low, effectively reducing or eliminating the safety hazard of overheating during operation and making its operation more stable.
[0056] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A pneumatic valve device, characterized in that, include: The housing has a receiving cavity, an air inlet, and an air outlet; A piston assembly is movably disposed within the receiving cavity to divide the receiving cavity into a first chamber and a second chamber. The first chamber communicates with the air inlet, and the second chamber communicates with the air outlet. The piston assembly includes a piston that is movable along the axial direction of the housing between a first position and a second position. The piston is provided with an air inlet channel that communicates the first chamber and the second chamber. A venting assembly is disposed on the piston, the venting assembly having an open state of opening the air intake passage and a closed state of closing the air intake passage; The ventilation assembly is in the closed state when the piston is in the first position, and is in the open state at least when the piston is in the second position.
2. The pneumatic valve device according to claim 1, characterized in that, The ventilation assembly includes a push rod and a first plug. The push rod is movably disposed on the piston and has a first end and a second end opposite to each other. The first plug is disposed on the first end of the push rod. When the first plug blocks the air intake channel, it is in the closed state. When the first plug opens the air intake channel, it is in the open state. Both the first plug and the second end of the push rod are configured to abut against the housing to drive the push rod to move relative to the piston.
3. The pneumatic valve device according to claim 1, characterized in that, The piston has at least one first protrusion on the side facing the air inlet, or the first chamber of the housing has at least one first protrusion, the first protrusion being configured to abut against the piston, and the piston and the housing being spaced apart by the first protrusion.
4. The pneumatic valve device according to claim 1, characterized in that, The piston is provided with a first guide portion, and the housing is provided with a second guide portion. The first guide portion and the second guide portion are connected in cooperation, and the piston reciprocates in the axial direction within the receiving cavity.
5. The pneumatic valve device according to claim 2, characterized in that, The ventilation assembly includes a first seal disposed on the piston and surrounding the port of the air intake passage, the first seal being configured to seal the gap between the piston and the first plug when the first plug is in the closed state; And / or, The piston assembly includes a second seal disposed radially outside the piston and moving synchronously with the piston. The second seal is configured to simultaneously abut against the piston and the housing, sealing the gap between the piston and the housing.
6. The pneumatic valve device according to claim 1, characterized in that, The piston assembly includes an elastic element that connects the piston and the housing, and the elastic element is configured to provide a reset force to the piston to drive the piston from the second position to the first position.
7. The pneumatic valve device according to claim 2, characterized in that, The housing is provided with a pressure relief port, which is connected to the second chamber; The piston assembly includes a switching switch, which is disposed on the side of the piston facing the pressure relief port. The switching switch is a self-locking switch, which can be held in a contracted state with the pressure relief port open or in an extended state with the pressure relief port blocked. When the piston approaches the second position, the piston drives the switching switch to abut against the inner wall of the housing to apply a switching force to the switching switch, so that the switching switch switches from the retracted state to the extended state, or from the extended state to the retracted state.
8. The pneumatic valve device according to claim 7, characterized in that, The switching switch includes a main body and a second plug. The main body is fixed to the piston, and the second plug is movably disposed in the main body. The second plug is configured to extend from the main body to block the pressure relief port, or retract into the main body to open the pressure relief port.
9. The pneumatic valve device according to claim 8, characterized in that, The first plug body has a second protrusion on the side away from the push rod, or the housing has a second protrusion, and the second protrusion is correspondingly provided to the first plug body; The radial dimension of the second protrusion is smaller than the radial dimension of the first plug, and the first plug and the housing are spaced apart by the second protrusion.
10. A pneumatic comfort system, characterized in that, It includes an air source, an air bag, and a pneumatic valve device as described in any one of claims 1-9, wherein the air source is connected to the air inlet, and the air bag is connected to the air outlet.