A miniature pneumatic control valve

Abstract

The utility model relates to pneumatic control valve technical field especially a kind of micro pneumatic control valve, including the upper valve body, middle valve body and lower valve body connected in sequence. Upper valve body is equipped with control gas port;Middle valve body is equipped with first gas port;Lower valve body is equipped with second gas port. Upper, middle valve body is equipped with piston bowl between, and it is with upper valve body and forms the first cavity that is communicated with control gas port. Lower valve body movable cavity top is equipped with spherical sealing sleeve with spherical groove. Valve core is slidably arranged in middle valve body communication groove, upper portion is contacted with skin bowl, lower portion is equipped with the valve head that is engaged with spherical groove, spring makes valve head always closed in spherical groove. The utility model replaces electric control with pneumatic control, no noise, pass through spherical sealing pair and multiple sealing structure to ensure reliability and long life, compact structure, applicable to the dense arrangement of massage chair gas circuit.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic valve technology, and in particular to a miniature pneumatic valve. Background Technology

[0002] As a popular health appliance, massage chairs utilize multiple inflatable airbags to simulate the pressing and kneading motions of human hands. These airbags are typically grouped and positioned in different areas, such as the backrest, seat cushion, arms, and legs. To achieve a complex and comfortable massage experience, a sophisticated airflow control system is required to quickly, reliably, and quietly control the inflation, pressure maintenance, and deflation of each airbag.

[0003] Currently, most massage chairs use solenoid valve arrays for air circuit control. However, solenoid valves have several inherent drawbacks: First, they produce a noticeable "clicking" sound during operation, which severely impacts the user experience in quiet and comfortable home environments. Second, the coil of the solenoid valve is prone to overheating after frequent on / off cycles, posing a risk of decreased reliability or even burnout. Third, the cost of a single solenoid valve is relatively high, and a high-end massage chair may require dozens of control points, significantly increasing the overall cost. Furthermore, the size of the solenoid valve limits the further integration and miniaturization of the air circuit control system within the limited space inside the massage chair, thus necessitating a structurally stable miniature air-controlled valve. Utility Model Content

[0004] To solve the above problems, this utility model provides a miniature pneumatic control valve, the specific technical solution of which is as follows: A miniature pneumatically controlled valve includes an upper valve body, a middle valve body, a lower valve body, a valve core, and a spring, which are connected sequentially from top to bottom. The upper valve body has a control air port; the middle valve body has a first air port on its side end; and the lower valve body has a second air port on its lower end face. A piston cup is disposed between the upper and middle valve bodies, forming a sealed first cavity with the inner wall of the upper valve body, and the control air port communicates with the first cavity. The lower valve body has a movable cavity that communicates with the second air port, and a spherical sealing sleeve is disposed at the top of the movable cavity, with a spherical groove formed on its lower end face. The middle valve body has a connecting groove on its inner side, with its side end communicating with the first air port and its lower end extending downwards to the spherical groove of the spherical sealing sleeve. The valve core is vertically slidably disposed in the communicating groove, with its upper part extending into the upper valve body and contacting the piston cup. The spring is sleeved on the outside of the valve core and acts on the valve core, causing it to tend to move upward. A valve head is provided at the lower end of the valve core, and the valve head is located in the movable cavity, with its shape matching the spherical groove. The outer diameter of the valve head is larger than the outer diameter of the valve core body, and the inner diameter of the movable cavity is larger than the outer diameter of the valve head.

[0005] When there is no air pressure input at the control port, the valve head is pressed against the spherical groove under the action of the spring, blocking the passage between the first air port and the second air port; when air pressure is input at the control port, the pressure in the first cavity increases, driving the piston cup to press down, thereby pushing the valve core to move down against the spring force, causing the valve head to separate from the spherical groove, and the first air port to connect with the second air port through the connecting groove and the movable cavity.

[0006] Preferably, the piston cup is a bowl-shaped structure made of flexible material, and its edge is tightly pressed between the connecting surfaces of the upper valve body and the middle valve body.

[0007] Preferably, the valve head is a sphere, a hemisphere, or a spherical crown that mates with a spherical groove.

[0008] Preferably, the upper valve body, middle valve body, and lower valve body are connected by threaded connection, snap-fit ​​connection, fastener fixing connection, or plastic welding.

[0009] Preferably, the lower end face of the upper valve body and / or the upper end face of the middle valve body are provided with an annular mating groove, and the outer edge of the piston cup is formed with an annular mating part, which is tightly pressed into the mating groove.

[0010] Preferably, a valve core cap is fixedly provided on the top of the valve core, and the top edge of the valve core cap is provided with a chamfer or rounded corner, and the upper surface of the valve core cap is in contact with the lower surface of the piston cup.

[0011] Preferably, the connection between the upper valve body and the middle valve body is formed by ultrasonic welding to form a first welded part; the connection between the middle valve body and the lower valve body is formed by ultrasonic welding to form a second welded part.

[0012] Preferably, a positioning block is provided at the lower end of the upper valve body, and a positioning notch is provided at the upper end of the middle valve body, with the positioning block embedded in the positioning notch.

[0013] Preferably, the upper end face of the lower valve body is provided with an annular sealing protrusion, and the lower end face of the middle valve body is provided with an annular notch, and the sealing protrusion is embedded in the notch.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Firstly, this design employs a stacked three-valve-body design (upper, middle, and lower), integrating the valve core, spring, and sealing components internally. This design maximizes space utilization, facilitates miniaturization, and utilizes a piston cup and air chamber for rapid response. The valve core cap design increases the contact area with the piston cup and avoids stress concentration, effectively preventing the piston cup from being punctured and significantly improving the valve's service life.

[0015] Secondly, the positioning blocks and notches in this design ensure circumferential positioning of the upper and middle valve bodies during assembly, improving assembly accuracy and efficiency. Ultrasonic welding ensures a strong valve body connection, good sealing, and overall structural stability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a miniature pneumatic valve; Figure 2 This is a cross-sectional view of a miniature pneumatic valve; Figure 3 This is a schematic diagram of the disassembled structure of a miniature pneumatic valve; Figure 4 This is a schematic diagram of the spherical sealing sleeve of a miniature pneumatic valve.

[0017] Reference numerals: 1. Upper valve body; 11. Control air port; 12. First cavity; 13. Fitting groove; 14. Positioning block; 2. Middle valve body; 21. First air port; 22. Connecting groove; 23. Positioning notch; 3. Lower valve body; 31. Second air port; 32. Movable cavity; 33. Sealing protrusion; 4. Valve core; 41. Valve head; 42. Valve core cap; 421. Chamfer; 5. Spring; 6. Piston cup; 61. Fitting part; 7. Spherical sealing sleeve; 71. Spherical groove. Detailed Implementation

[0018] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0019] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0020] like Figures 1 to 4 As shown, the miniature pneumatic valve of this utility model is mainly composed of an upper valve body 1, a middle valve body 2, a lower valve body 3, a valve core 4, a spring 5, a piston cup 6, and a spherical sealing sleeve 7.

[0021] The lower end face of the upper valve body 1 and the upper end face of the middle valve body 2 are ultrasonically welded to form a first welded part; the lower end face of the middle valve body 2 and the upper end face of the lower valve body 3 are ultrasonically welded to form a second welded part, making the entire valve structure robust and with good sealing performance. To ensure correct angle during assembly, a positioning block 14 is provided at the lower end of the upper valve body 1, and a corresponding positioning notch 23 is provided at the upper end of the middle valve body 2. During assembly, the positioning block 14 is precisely embedded in the positioning notch 23. To further enhance the sealing performance at the connection between the middle and lower valve bodies, the upper end face of the lower valve body 3 has a ring-shaped sealing protrusion 33, and the lower end face of the middle valve body 2 has a corresponding ring-shaped notch. The sealing protrusion 33 is tightly embedded in the notch under welding pressure.

[0022] The upper valve body 1 has a control air port 11 at its top. The piston cup 6 is made of soft rubber or silicone material and is bowl-shaped, with an annular fitting part 61 formed on its outer edge. An annular fitting groove 13 is formed on the lower end face of the upper valve body 1. The fitting part 61 of the piston cup 6 is tightly pressed into the fitting groove 13, and together with the inner sidewall of the upper valve body 1, it forms a sealed first cavity 12. The control air port 11 communicates with this first cavity 12. This structure ensures the stability of the piston cup 6 installation and the sealing of the first cavity 12.

[0023] The valve core 4 is vertically positioned, with its central portion slidingly inserted into the communicating groove 22 of the middle valve body 2. A valve core cap 42 is fixed to the top of the valve core 4, and the top edge of the valve core cap 42 is machined with a chamfer 421 (or rounded corner). The upper surface of the valve core cap 42 contacts the central area of ​​the lower surface of the piston cup 6. A spring 5 is fitted onto the valve core 4, with its upper end abutting against the step on the inner wall of the middle valve body 2 and its lower end abutting against the step surface of the valve core 4, providing a continuous upward thrust to the valve core 4. A valve head 41 is provided at the lower end of the valve core 4; in this embodiment, the valve head 41 is spherical.

[0024] The lower valve body 3 has a movable cavity 32, the bottom of which communicates with the second air port 31. A spherical sealing sleeve 7 made of elastic sealing material (such as rubber) is pressed into the top of the movable cavity 32, and a spherical groove 71 is machined on the lower end face of the spherical sealing sleeve 7. The valve head 41 is located in the movable cavity 32 and its shape matches that of the spherical groove 71. The outer diameter of the valve head 41 is larger than the outer diameter of the valve core 4 stem, while the inner diameter of the movable cavity 32 is significantly larger than the outer diameter of the valve head 41 to ensure smooth airflow.

[0025] The working principle of this utility model is as follows: Closed state: When there is no control air pressure input at control port 11, valve core 4 is in the upper limit position under the thrust of spring 5. At this time, the valve head 41 at the lower end of valve core 4 is tightly pressed into the spherical groove 71 of spherical sealing sleeve 7, forming a reliable spherical seal. The first air port 21 is connected to the space above valve head 41 through the connecting groove 22, but due to the blockage of valve head 41, gas cannot enter the moving chamber 32 and the lower second air port 31, thereby achieving a circuit break between the first air port 21 and the second air port 31.

[0026] Open State: When the valve needs to be opened, control air pressure is injected into the control port 11. The gas enters the first chamber 12, increasing its internal pressure. The pressure acts on the piston cup 6, causing it to deform downwards. The piston cup 6 presses down on the valve core cap 42, pushing the valve core 4 downwards against the force of the spring 5. The downward movement of the valve core 4 separates the valve head 41 from the spherical groove 71 of the spherical sealing sleeve 7. At this time, the gas entering from the first port 21 flows through the connecting groove 22, enters the gap formed by the separation of the valve head 41 and the spherical sealing sleeve 7, then enters the spacious movable chamber 32, and finally flows out from the second port 31, realizing the passage between the first port 21 and the second port 31.

[0027] When the control air pressure is removed, the pressure in the first chamber 12 disappears, and the valve core 4 moves upward under the action of the spring 5's reset force, which drives the valve head 41 to press against the spherical groove 71 again, and the valve returns to the closed state.

[0028] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A miniature pneumatically controlled valve, characterized in that: It includes an upper valve body (1), a middle valve body (2), a lower valve body (3), a valve core (4), and a spring (5), wherein the upper valve body (1), the middle valve body (2), and the lower valve body (3) are connected sequentially from top to bottom. The upper valve body (1) is provided with a control air port (11); The middle valve body (2) is provided with a first air port (21) at its side end; The lower end face of the lower valve body (3) is provided with a second air port (31); A piston cup (6) is provided between the upper valve body (1) and the middle valve body (2). The piston cup (6) and the inner wall of the upper valve body (1) form a sealed first cavity (12). The control air port (11) is connected to the first cavity (12). The lower valve body (3) is provided with a movable cavity (32), which is connected to the second air port (31), and a spherical sealing sleeve (7) is provided on the top of the movable cavity (32), and a spherical groove (71) is provided on the lower end face of the spherical sealing sleeve (7). The inner side of the valve body (2) is provided with a connecting groove (22), the side end of the connecting groove (22) is connected to the first air port (21), and its lower end extends downward and leads to the spherical groove (71) of the spherical sealing sleeve (7). The valve core (4) is vertically slidably disposed in the communicating groove (22), with its upper part extending into the upper valve body (1) and contacting the piston cup (6). The spring (5) is sleeved on the outside of the valve core (4) and acts on the valve core (4) to make it have an upward tendency. The lower end of the valve core (4) is provided with a valve head (41), which is located in the movable cavity (32) and its shape matches the spherical groove (71). The outer diameter of the valve head (41) is larger than the outer diameter of the valve core (4) body, and the inner diameter of the movable cavity (32) is larger than the outer diameter of the valve head (41).

2. The miniature pneumatic valve according to claim 1, characterized in that: The piston cup (6) is a bowl-shaped structure made of flexible material, and its edge is tightly pressed between the connecting surfaces of the upper valve body (1) and the middle valve body (2).

3. The miniature pneumatic valve according to claim 1, characterized in that: The valve head (41) is a sphere, a hemisphere, or a spherical crown that mates with a spherical groove (71).

4. The miniature pneumatic valve according to claim 1, characterized in that: The upper valve body (1), middle valve body (2) and lower valve body (3) are connected by thread, snap-fit, fasteners or plastic welding.

5. The miniature pneumatic valve according to any one of claims 1 or 2, characterized in that: The lower end face of the upper valve body (1) and / or the upper end face of the middle valve body (2) are provided with an annular fitting groove (13), and the outer edge of the piston cup (6) is formed with an annular fitting part (61), which is tightly pressed into the fitting groove (13).

6. The miniature pneumatic valve according to claim 1, characterized in that: A valve core cap (42) is fixedly provided on the top of the valve core (4). The top edge of the valve core cap (42) is provided with a chamfer (421) or a rounded corner. The upper surface of the valve core cap (42) is in contact with the lower surface of the piston cup (6).

7. The miniature pneumatic valve according to any one of claims 1 or 4, characterized in that: The connection between the upper valve body (1) and the middle valve body (2) is formed by ultrasonic welding to form a first welded part; the connection between the middle valve body (2) and the lower valve body (3) is formed by ultrasonic welding to form a second welded part.

8. The miniature pneumatic valve according to claim 1, characterized in that: The lower end of the upper valve body (1) is provided with a positioning block (14), and the upper end of the middle valve body (2) is provided with a corresponding positioning notch (23). The positioning block (14) is embedded in the positioning notch (23).

9. The miniature pneumatic valve according to claim 1, characterized in that: The upper end face of the lower valve body (3) is provided with a ring-shaped sealing protrusion (33), and the lower end face of the middle valve body (2) is provided with a ring-shaped notch, and the sealing protrusion (33) is embedded in the notch.

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