A pneumatic diaphragm actuator and a pneumatic actuating device

Abstract

The application discloses a kind of pneumatic diaphragm actuator and pneumatic actuator.The pneumatic diaphragm actuator of the application includes film cover, with cavity inside, be equipped with air inlet and exhaust hole and all with cavity communication;Diaphragm, be in cavity, and set on the film cover between air inlet and exhaust hole, and can reciprocate in cavity under the action of gas pressure;Push rod, one end is connected with diaphragm, the other end is arranged on film cover and extends to the outside of film cover;Anti-rotation mechanism, between diaphragm and film cover, with diaphragm transmission connection, for guiding diaphragm moves according to linear trajectory.The pneumatic diaphragm actuator of the application is equipped with anti-rotation mechanism, in the process that diaphragm drives push rod to move, can avoid the breakage or damage of diaphragm due to the rotation of diaphragm, prolongs the life of diaphragm and pneumatic diaphragm actuator.

Description

Technical Field

[0001] This invention belongs to the technical field of pneumatic diaphragm actuators, specifically, it relates to a pneumatic diaphragm actuator mechanism and a pneumatic actuator device. Background Technology

[0002] In existing technology, pneumatic diaphragm control valves are a type of control device in pneumatic unit combination instruments, and are an important component of automatic control systems for production processes. They receive output signals from control instruments to close and open valves, achieving automatic regulation of parameters such as pressure, temperature, flow rate, and liquid level. They are widely used in automatic regulation and remote control in chemical, petroleum, metallurgical, power, and textile industries. Currently, commonly used pneumatic diaphragm control valves mainly consist of a valve mechanism and an actuator, connected by a push rod. The pneumatic diaphragm actuator, as a commonly used drive device for control valves, is used to control and regulate valve opening. Pneumatic diaphragm actuators are simple in structure, reliable in operation, easy to maintain, and low in cost, and are therefore widely used.

[0003] Pneumatic diaphragm actuators are categorized into conventional and high-thrust types. For control valves with a diameter of DN150 or larger (minimum ANSI 600 psi PN110) and a diameter of DN100 or larger (maximum ANSI 600 psi PN110), small-area actuators cannot provide sufficient thrust under conditions of large differential pressure and unstable medium pressure. Therefore, actuators capable of providing high thrust must be designed. High-thrust pneumatic diaphragm actuators are devices used to provide power to large-diameter valves (DN250-DN400). Compared to conventional pneumatic diaphragm actuators, they have stricter application requirements and higher safety standards, resulting in a more complex structure. This leads to problems such as the valve core and stem rotating when the valve internal pressure is high, causing the actuator's push rod to rotate as well, and the diaphragm of the actuator rotating and potentially being damaged due to the push rod's rotation.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pneumatic diaphragm actuator. By setting an anti-rotation mechanism inside the diaphragm cover, the anti-rotation mechanism can prevent the diaphragm from cracking or being damaged due to the rotation of the diaphragm during the movement of the push rod driven by the diaphragm, thereby extending the service life of the diaphragm and the pneumatic diaphragm actuator.

[0006] Another object of the present invention is to provide a pneumatic actuator.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] A pneumatic diaphragm actuator, comprising

[0009] The membrane cover has an internal cavity and is provided with an air inlet and an air outlet, both of which are in communication with the cavity.

[0010] A diaphragm is disposed within the cavity and on the membrane cover between the air inlet and the air outlet, and is capable of reciprocating within the cavity under the action of air pressure;

[0011] The push rod has one end connected to the diaphragm and the other end passing through the diaphragm cover and extending to the outside of the diaphragm cover;

[0012] An anti-rotation mechanism is located between the diaphragm and the diaphragm cover, and is connected to the diaphragm in a transmission manner, for guiding the diaphragm to move along a straight trajectory.

[0013] Furthermore, the anti-rotation mechanism is disposed between the diaphragm near the vent hole and the diaphragm cover;

[0014] Alternatively, the anti-rotation mechanism may be disposed between the diaphragm near the air inlet and the diaphragm cover.

[0015] Furthermore, one end of the anti-rotation mechanism is connected to the membrane cover, and the other end is connected to the diaphragm. The two ends of the anti-rotation mechanism are slidably connected or telescopically connected.

[0016] The anti-rotation mechanism includes a circumferential limiting structure disposed between the two ends of the anti-rotation mechanism, which is used to circumferentially limit the movement of the two ends of the anti-rotation mechanism relative to each other.

[0017] Furthermore, the anti-rotation mechanism also includes

[0018] A fixing part is provided on the membrane cover;

[0019] A sliding part is provided on the diaphragm;

[0020] The sliding part and the fixed part are slidably connected, and the circumferential limiting structure is provided between the sliding part and the fixed part and extends a certain length to restrict the circumferential rotation between the sliding part and the fixed part;

[0021] Preferably, the sliding part and the fixed part are interlocked, and the cross section of the sliding part is polygonal;

[0022] Preferably, the circumferential limiting structure is a slide rail structure or a slider groove structure.

[0023] Furthermore, it also includes a tray assembly disposed on the side of the diaphragm near the vent hole;

[0024] The anti-rotation mechanism is disposed between the tray assembly and the membrane cover.

[0025] Furthermore, it also includes an elastic component disposed between the tray assembly and the membrane cover;

[0026] The elastic component is sleeved on the anti-rotation mechanism, and the elastic component extends along the setting direction of the anti-rotation mechanism;

[0027] Preferably, the elastic component includes

[0028] A first elastic element is sleeved on the anti-rotation mechanism and spaced apart from the anti-rotation mechanism;

[0029] The second elastic element is located between the first elastic element and the anti-rotation mechanism, and its spiral direction is consistent with that of the first elastic element.

[0030] Furthermore, it also includes

[0031] A limiting block is provided at one end of the push rod near the tray assembly, and the limiting block moves back and forth with the push rod;

[0032] A stroke adjustment mechanism is movably mounted on the membrane cover;

[0033] One end of the stroke adjustment mechanism extends into the cavity, and the stroke adjustment mechanism is arranged opposite to the limiting block to adjust the working stroke of the diaphragm.

[0034] Furthermore, the vent has a rainproof mechanism;

[0035] The rainproof mechanism has multiple channels to prevent rainwater from entering the cavity.

[0036] Furthermore, the membrane cover includes

[0037] The lower membrane cover is slidably connected to the push rod.

[0038] The upper membrane cover is fastened to the lower membrane cover;

[0039] The cavity is formed between the lower membrane cover and the upper membrane cover;

[0040] Preferably, the lower membrane cover and the upper membrane cover are detachably connected by a connecting assembly;

[0041] Preferably, the two ends of the diaphragm are located between the lower diaphragm cover and the upper diaphragm cover, and are respectively fixed by the corresponding connecting components.

[0042] The present invention also discloses a pneumatic actuator, including the above-described pneumatic diaphragm actuator.

[0043] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0044] 1. The pneumatic diaphragm actuator of the present invention, by setting an anti-rotation mechanism, restricts the diaphragm from rotating circumferentially during movement, ensuring that the push rod can only move along its own axis, thereby effectively preventing the rotation of the diaphragm without affecting the stroke, avoiding diaphragm breakage and damage caused by diaphragm rotation, and extending the service life of the diaphragm and the pneumatic diaphragm actuator.

[0045] 2. The pneumatic diaphragm actuator of the present invention, by setting a stroke adjustment knob, which cooperates with the stroke limit block on the push rod, can be used to adjust the working stroke of the pneumatic actuator to improve its practicality and adaptability.

[0046] 3. In the pneumatic diaphragm actuator of the present invention, both the tray assembly and the upper diaphragm cover are equipped with spring assemblies, each spring assembly consisting of two springs, one inner and one outer. This combined spring design increases the spring output force and stroke while reducing space requirements. Spring guides are provided on the tray assembly and the upper diaphragm cover to improve the spring's movement accuracy and extend its service life.

[0047] At the same time, the present invention has a simple structure, a concise method, and significant effects, making it suitable for widespread use.

[0048] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0049] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0050] Figure 1 This is a schematic diagram of the structure of the pneumatic diaphragm actuator of the present invention;

[0051] Figure 2 In this invention Figure 1 Enlarged view of point A in the middle;

[0052] Figure 3 This is a schematic diagram of the structure of the lower membrane cover of the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of the upper membrane cover of the present invention;

[0054] Figure 5 This is a schematic diagram of the tray assembly of the present invention;

[0055] Figure 6 This is a structural schematic diagram of the base of the present invention.

[0056] In the diagram: 1. Membrane cover; 101. Air inlet; 102. Exhaust outlet; 103. Cavity; 104. Upper membrane cover; 105. Lower membrane cover; 106. Ear plate; 107. Weight reduction hole; 2. Diaphragm; 3. Tray assembly; 301. Main body; 302. Extension; 4. Push rod; 5. Anti-rotation mechanism; 501. Fixing part; 502. Sliding part; 6. Sealing seat; 7. Bracket; 701. Support rod; 702. Base; 8. Elastic component; 801. First elastic element; 802. Second elastic element; 9. Limiting block; 10. Stroke adjustment mechanism; 11. Rainproof mechanism; 1101. Rainproof seat; 1102. Main flow channel; 1103. Secondary flow channel; 12. Connecting assembly; 13. Support part.

[0057] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0059] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] like Figures 1 to 6As shown, the pneumatic diaphragm actuator of the present invention includes a diaphragm cover 1, a diaphragm 2, a push rod 4, and an anti-rotation mechanism 5. The diaphragm cover 1 has an air inlet 101 at its lower part and an exhaust outlet 102 at its upper part. A cavity 103 is formed inside the diaphragm cover 1, communicating with the air inlet 101 and the exhaust outlet 102. The diaphragm 2 is disposed within the cavity 103, with both ends connected to the diaphragm cover 1. The diaphragm 2 is positioned between the air inlet 101 and the exhaust outlet 102 and is capable of reciprocating between them. The push rod 4 is slidably mounted on the diaphragm cover 1, with one end connected to the diaphragm 2 and the other end extending to the outside of the diaphragm cover 1 and connected to the actuator. The anti-rotation mechanism 5 is located between the diaphragm 2 and the diaphragm cover 1 and is used to guide the diaphragm 2 to move along a linear trajectory.

[0062] In use, gas is injected into the cavity 103 between the diaphragm 2 and the lower diaphragm cover 105 through the air inlet 101. Under the action of air pressure, the diaphragm 2 moves upward. Since the push rod 4 is connected to the diaphragm 2, the push rod 4 also moves upward, thereby satisfying the linear movement of the actuator.

[0063] By setting the anti-rotation mechanism 5, the circumferential rotation of the diaphragm 2 is restricted, ensuring that the push rod 4 can only move along its own axis. This effectively prevents the rotation of the diaphragm 2 without affecting the working stroke, avoiding diaphragm 2 breakage and damage caused by rotation, and extending the life of the diaphragm 2 and the pneumatic diaphragm actuator.

[0064] In this embodiment, the pneumatic diaphragm actuator is usually used in conjunction with the valve mechanism. The actuator connected to the push rod 4 refers to the actuator in the valve mechanism, which is used to control the opening and closing of the valve.

[0065] In this embodiment, the membrane cover 1 includes an upper membrane cover 104 and a lower membrane cover 105. The upper membrane cover 104 and the lower membrane cover 105 are fastened together, and a cavity 103 is formed between the lower membrane cover 105 and the upper membrane cover 104. The push rod 4 is slidably connected to the lower membrane cover 105. An air inlet 101 is formed on the lower membrane cover 105, and an exhaust port 102 is formed on the upper membrane cover 104.

[0066] In this embodiment, guiding the diaphragm 2 to move along a straight trajectory means that the diaphragm 2, equivalent to the axis of the push rod 4, does not rotate circumferentially. It can be understood that when the diaphragm 2 rotates during movement, its trajectory is a spiral. In this embodiment, equivalent to the upper membrane cover 104, the diaphragm 2 and the upper membrane cover 104 are in a substantially parallel state during movement.

[0067] In this embodiment, the anti-rotation mechanism 5 can be disposed between the upper membrane cover 104 and the diaphragm 2, or between the lower membrane cover 105 and the diaphragm 2. Preferably, it is disposed between the upper membrane cover 104 and the diaphragm 2 to improve stability during installation and facilitate installation and disassembly.

[0068] In this embodiment, the air inlet 101 can be opened on the side or bottom of the lower membrane cover 105, and the exhaust port 102 can be opened on the side or top of the upper membrane cover 104.

[0069] Of course, depending on the function to be achieved, the air inlet 101 can also be opened on the side or top of the upper membrane cover 104, and the exhaust port 102 can be opened on the side or bottom of the lower membrane cover 105. The installation direction of the diaphragm 2 and the push rod 4 can be adjusted accordingly.

[0070] In this embodiment, the upper membrane cover 104 and the lower membrane cover 105 are detachably connected by the connecting assembly 12 to facilitate assembly and disassembly. The detachable method can be snap-fit, bolt connection, screw connection, etc.

[0071] In this embodiment, to facilitate the connection between the upper membrane cover 104 and the lower membrane cover 105, ear plates 106 extend from both sides of the upper membrane cover 104 and both sides of the lower membrane cover 105. The ear plates 106 are substantially perpendicular to the side walls of the upper membrane cover 104 and the lower membrane cover 105. The ear plates 106 reduce the difficulty of assembly. For example, using bolts, the ear plates 106 of the upper membrane cover 104 and the lower membrane cover 105 are directly connected together using bolts.

[0072] In this embodiment, the diaphragm 2 can also be fixed by the connecting assembly 12. Specifically, the end of the diaphragm 2 is located between the ear plate 106 of the upper diaphragm cover 104 and the ear plate 106 of the lower diaphragm cover 105. By cooperating with the connecting assembly 12, the ear plate 106 of the upper diaphragm cover 104 and the ear plate 106 of the lower diaphragm cover 105, the diaphragm 2 is clamped and fixed, thereby connecting both ends of the diaphragm 2 to the diaphragm cover 1.

[0073] In this embodiment, both the upper membrane cover 104 and the lower membrane cover 105 are provided with multiple weight-reducing holes 107, which effectively reduce the weight of the pneumatic actuator while ensuring pressure resistance. The weight-reducing holes 107 can be in the form of a combination of sizes or in the form of a single size.

[0074] In this embodiment, diaphragm 2 refers to an elastic thin film. Diaphragm 2 includes a rubber layer and a flexible tensile member. The rubber layer forms diaphragm 2, and the flexible tensile member is disposed within the rubber layer to enhance the tensile strength of diaphragm 2 and ensure its load-bearing capacity. The flexible tensile member is a reinforced woven fabric.

[0075] In this embodiment, the diaphragm 2 is arranged along the length of the membrane cover 1. It can be understood that, since the gas will push the diaphragm 2 to move, the actual length of the diaphragm 2 is greater than the length of the membrane cover 1. During the movement of the diaphragm 2, there is always a accommodating space on the side of the diaphragm 2 away from the air inlet 101 to accommodate the tray assembly 3.

[0076] To facilitate the installation of the membrane cover 1, a bracket 7 is also provided. The bracket 7 is connected to the bottom of the lower membrane cover 105 and is used for connection with other mechanisms. Specifically, the bracket 7 includes a support rod 701 and a base 702. One end of the support rod 701 is connected to the bottom of the lower membrane cover 105, and the other end is connected to the base 702, which is used for valve body connection. In this embodiment, multiple support rods 701 can be provided. One end of the support rod 701 can be connected to the lower membrane cover 105 by threads, and the other end is connected and fixed to the base 702 by a nut. Compared with the traditional cast support structure, this columnar support structure is simple in structure, small in size, and light in weight.

[0077] In this embodiment, the base 702 is rhomboid in shape. This rhomboid structure can reduce weight while meeting the load-bearing requirements.

[0078] In this embodiment, one end of the anti-rotation mechanism 5 is connected to the membrane cover 1, and the other end is connected to the diaphragm 2. The two ends of the anti-rotation mechanism 5 are slidably connected or telescopically connected. The anti-rotation mechanism 5 includes a circumferential limiting structure disposed between the two ends of the anti-rotation mechanism 5, which is used to circumferentially limit the movement of the two ends of the anti-rotation mechanism 5 relative to each other. When the diaphragm 2 is moving, the circumferential limiting structure plays a circumferential limiting role, preventing the diaphragm 2 from rotating circumferentially and avoiding damage to the diaphragm 2 due to torsional force.

[0079] In this embodiment, when the anti-rotation mechanism 5 is a sliding connection, the diaphragm 2 is slidably connected to the diaphragm cover 1 through a sliding structure. By setting the sliding structure, the diaphragm cover 1 and the diaphragm 2 are restricted to linear movement only, preventing them from undergoing circumferential movement.

[0080] When the anti-rotation mechanism 5 is a telescopic structure, it is located between the diaphragm 2 and the diaphragm cover 1 to guide and pull the diaphragm 2. When the gas pushes the diaphragm 2 and the tray assembly 3 to move, the telescopic structure can contract accordingly. At the same time, the diaphragm 2 is pulled by the telescopic structure, which can effectively prevent the diaphragm 2 from rotating circumferentially.

[0081] To further explain, when the anti-rotation mechanism 5 is a telescopic connection, both ends of the telescopic mechanism are connected to the upper membrane cover 104 and the diaphragm 2, respectively. When the gas pushes the diaphragm 2 to move, the telescopic mechanism is compressed and contracts. Since both ends of the telescopic mechanism are connected to the upper membrane cover 104 and the diaphragm 2, it can also limit rotation while ensuring contraction. In this embodiment, the telescopic mechanism can be an elastic element, that is, it contracts under pressure and can return to its initial state after the pressure is removed. Specifically, the elastic element can be a rubber element or a telescopic rod.

[0082] Specifically, the anti-rotation mechanism 5 includes a fixed part 501 and a sliding part 502. The fixed part 501 is fixedly mounted on the upper membrane cover 104 and has a hollow structure. The sliding part 502 is mounted on the membrane 2 and is inserted into the fixed part 501. The sliding part 502 and the fixed part 501 are slidably connected.

[0083] When the anti-rotation mechanism 5 is a sliding structure, it acts as a guide, restricting the circumferential rotation of the diaphragm 2. Specifically, the circumferential limiting structure can be a combination of a slider and a sliding rod. The sliding rod is fixed to the fixed part 501 and extends towards the location of the diaphragm 2. There can be two sliding rods, arranged in parallel. The slider is fixed to the sliding part 502, and the slider and sliding rod are arranged in a one-to-one correspondence. The sliding rod passes through the slider and is slidably connected to it. When the gas pushes the diaphragm 2 to move, the slider slides on the sliding rod, serving as a guide and limiting mechanism.

[0084] The circumferential limiting structure can also be a combination of a slide rail and a roller. The slide rail is fixed on the fixing part 501 and extends towards the location of the diaphragm 2. Two slide rails can be provided, arranged in parallel. The roller is fixed on the sliding part 502, with each slide rail and roller corresponding to the other. The roller is mounted on the slide rail. When the gas pushes the diaphragm 2 to move, the roller rolls on the slide rail, serving as a guide and limiting mechanism. In this embodiment, the circumferential limiting structure can also be a combination of a slider and a groove.

[0085] In this embodiment, the cross-sections of the fixing part 501 and the sliding part 502 are polygonal, for example, square. Utilizing their own structural characteristics, they form a limiting structure. The sliding part 502 and the fixing part 501 mutually constitute a circumferential limiting structure, eliminating the need for additional limiting structures.

[0086] In this embodiment, a tray assembly 3 is also provided, which is disposed on the diaphragm 2 and located on the side of the diaphragm 2 near the vent 102. A push rod 4 is connected to the tray assembly 3, and an anti-rotation mechanism 5 is disposed between the tray assembly 3 and the diaphragm cover 1, and is drively connected to the tray assembly 3. The tray assembly 3 improves overall stability and facilitates the installation and connection of the anti-rotation mechanism 5 and the push rod 4.

[0087] In this embodiment, the tray assembly 3 has an extension 302. When the diaphragm 2 is at its lowest position, the diaphragm 2 is U-shaped. The extension 302 is provided on both sides of the tray assembly 3, making the tray assembly 3 also U-shaped. The extensions 302 on both sides can provide support.

[0088] In this embodiment, the connection between the main body 301 and the extension 302 of the tray assembly 3 can be a fully welded structure. The upper membrane cover 104 and the lower membrane cover 105 can also be designed in sections, and the section connection can also be a fully welded structure. This structure is suitable for small batches or non-standard customization, avoiding the use of casting or forging processes; it is welded in two sections, which also avoids the use of a whole piece of bar or plate, reducing material costs.

[0089] In this embodiment, the connection between the push rod 4 and the tray assembly 3 can be either detachable or fixed. Of course, a sealing seat 6 is provided on the lower membrane cover 105 to improve the sealing between the push rod 4 and the lower membrane cover 105. A support portion 13 is provided on the push rod 4 to provide support and ensure overall stability.

[0090] In this embodiment, an elastic component 8 is also included. The two ends of the elastic component 8 are respectively disposed on the tray assembly 3 and the upper membrane cover 104. The elastic component 8 is sleeved on the fixed part 501 and the sliding part 502, and extends along the axial direction of the fixed part 501 and the sliding part 502. When gas pushes the diaphragm 2 and the tray assembly 3 to move, the elastic component 8 is compressed by force; when gas is drawn out through the air inlet 101 to achieve pressure relief, the tray assembly 3 and the diaphragm 2 can return to their initial state under the action of elastic force.

[0091] In this embodiment, when the gas pushes the diaphragm 2 and the tray assembly 3 to move, the sliding part 502 slides within the fixed part 501, guiding and limiting the tray assembly 3. Simultaneously, the elastic component 8 is sleeved on the fixed part 501 and the sliding part 502, which also guide the elastic component 8, improving motion accuracy and extending its service life.

[0092] In this embodiment, the connection between the fixing part 501 and the sliding part 502 can be a fixed connection or a detachable connection, such as a screw connection or a self-tapping screw connection.

[0093] In this embodiment, one or more anti-rotation mechanisms 5 can be provided, while multiple elastic components 8 should be provided to ensure the stability of the diaphragm 2 during movement. When the number of anti-rotation mechanisms 5 and elastic components 8 is the same, the anti-rotation mechanisms 5 and elastic components 8 are provided in a one-to-one correspondence. When there is one anti-rotation mechanism 5 or fewer elastic components 8, an additional guide member can be provided, which can be a sleeve.

[0094] The elastic component 8 includes a first elastic element 801 and a second elastic element 802. The first elastic element 801 is sleeved on the anti-rotation mechanism 5 and spaced apart from it. The second elastic element 802 is located between the first elastic element 801 and the anti-rotation mechanism 5, and the helical direction of the second elastic element 802 is consistent with that of the first elastic element 801. The combined elastic element design, formed by the first elastic element 801 and the second elastic element 802, can increase the output force, increase the stroke, and reduce the space occupied. In this embodiment, both the first elastic element 801 and the second elastic element 802 can be springs.

[0095] In this embodiment, to ensure the accuracy of the movement stroke of the actuator in the valve mechanism, a limiting block 9 is also provided. The limiting block 9 is mounted on the push rod 4, located at the end of the push rod 4 near the tray assembly 3. The limiting block 9 moves back and forth with the push rod 4. When the gas pushes the diaphragm 2 and the tray assembly 3 to move, the limiting block 9 also moves accordingly until it abuts against the inner wall of the upper diaphragm cover 104. At this point, the push rod 4 reaches its maximum stroke, indicating that the actuator has reached its optimal position.

[0096] Furthermore, a stroke adjustment mechanism 10 is also provided on the upper membrane cover 104, which is movably mounted on the upper membrane cover 104. One end of the stroke adjustment mechanism 10 extends into the cavity 103, and the stroke adjustment mechanism 10 is positioned opposite to the limiting block 9 to adjust the working stroke of the diaphragm 2. Depending on the different actuators, the stroke adjustment mechanism 10 is adjusted to change the length extending into the cavity 103, thereby changing the distance between the bottom of the stroke adjustment mechanism 10 and the limiting block 9 to control the working stroke.

[0097] In this embodiment, the movement of the stroke adjustment mechanism 10 can be either threaded or sliding.

[0098] In this embodiment, the vent 102 is located on the top of the upper membrane cover 104, so that the device can also be used outdoors, improving its practicality. The vent 102 has a rainproof mechanism 11, which has multiple channels to prevent rainwater from entering the cavity 103.

[0099] Specifically, the rainproof mechanism 11 includes a rainproof seat 1101, which is T-shaped. The rainproof seat 1101 is installed on the outer wall of the upper membrane cover 104. The rainproof seat 1101 has a main flow channel 1102 and secondary flow channels 1103. The main flow channel 1102 is connected to the vent 102 and extends along the height direction of the rainproof seat 1101 without penetrating the top of the rainproof seat 1101. There are multiple secondary flow channels 1103, each of which is connected to the main flow channel 1102. Each secondary flow channel 1103 is set at an angle to the main flow channel 1102 and extends towards the upper membrane cover 104, penetrating the outer wall of the rainproof seat 1101. Through the design of the rainproof seat 1101, the vent 102 is changed from an upward opening to a downward opening, effectively providing rain protection.

[0100] The working principle of the pneumatic diaphragm actuator of the present invention is as follows: The stroke adjustment mechanism 10 is pre-adjusted according to the working stroke of the actuator in the valve mechanism. Gas is injected into the cavity 103 through the air inlet 101. As the gas between the diaphragm 2 and the lower diaphragm cover 105 increases, under the action of air pressure, the diaphragm 2 and the tray assembly 3 move upward together. Simultaneously, the diaphragm 2 compresses the air between the diaphragm 2 and the upper diaphragm cover 104 and discharges it through the exhaust port 102. The movement of the tray assembly 3 continuously drives the push rod 4 to move in the same direction until the limit block 9 and the stroke adjustment mechanism 10 abut. When the gas between the diaphragm 2 and the lower diaphragm cover 105 is discharged through the air inlet 101, under the action of the elastic element, the diaphragm 2 and the tray assembly 3 can return to their initial state, and the push rod 4 also returns to its initial state.

[0101] This invention also discloses a pneumatic actuator, including a valve mechanism and the aforementioned pneumatic diaphragm actuator. One end of the push rod 4 extending outside the diaphragm cover 1 is connected to the actuator element in the valve mechanism. By cooperating with the actuator element in the valve mechanism, the valve mechanism can be switched on and off. Specifically, the working process can be from open to closed, i.e., the valve mechanism is a normally open valve. Alternatively, the working process can be from closed to open, i.e., the valve mechanism is a normally closed valve.

[0102] In use, push rod 4 is connected to the actuator in the valve mechanism. Gas is injected into cavity 103 through air inlet 101. As the gas between diaphragm 2 and lower diaphragm cover 105 increases, diaphragm 2 and tray assembly 3 move upward together. Simultaneously, push rod 4 slides upward, moving the actuator in the valve mechanism. During the upward movement of diaphragm 2, air between diaphragm 2 and upper diaphragm cover 104 is discharged through exhaust port 102, and the elastic element is compressed under gas pressure. The stroke adjustment mechanism 10 is pre-adjusted according to the working stroke of the actuator in the valve mechanism. During the movement of diaphragm 2, the accuracy of the working stroke of the actuator in the valve mechanism is ensured by the cooperation of limit block 9 and stroke adjustment mechanism 10. When limit block 9 moves to its limit position, it indicates that the valve mechanism is in the open or closed state.

[0103] When the gas between the lower diaphragm cover 105 and the diaphragm 2 is drawn out through the air inlet 101, the chamber between the lower diaphragm cover 105 and the diaphragm 2 is depressurized. Under the action of the elastic element, the diaphragm 2 and the tray assembly 3 move downward together until they return to their initial state. When the diaphragm 2 and the tray assembly 3 move downward, they drive the push rod 4 to move downward together, so that the actuator in the valve mechanism also returns to its initial state.

[0104] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pneumatic diaphragm actuator, characterized in that: include The membrane cover (1) has an internal cavity (103) and is provided with an air inlet (101) and an air outlet (102) that are both connected to the cavity (103); A diaphragm (2) is disposed in the cavity (103) and on the membrane cover (1) between the air inlet (101) and the exhaust (102), and is capable of reciprocating within the cavity (103) under the action of air pressure; The push rod (4) is connected at one end to the diaphragm (2) and at the other end passes through the diaphragm cover (1) and extends to the outside of the diaphragm cover (1); An anti-rotation mechanism (5) is provided between the diaphragm (2) and the diaphragm cover (1), and is connected to the diaphragm (2) in a transmission manner, for guiding the diaphragm (2) to move along a straight trajectory.

2. The pneumatic diaphragm actuator according to claim 1, characterized in that: The anti-rotation mechanism (5) is disposed between the diaphragm (2) on the side near the vent (102) and the diaphragm cover (1); Alternatively, the anti-rotation mechanism (5) is disposed between the diaphragm (2) on the side near the air inlet (101) and the diaphragm cover (1).

3. The pneumatic diaphragm actuator according to claim 2, characterized in that: One end of the anti-rotation mechanism (5) is connected to the membrane cover (1), and the other end is connected to the membrane (2). The two ends of the anti-rotation mechanism (5) are slidably connected or telescopically connected. The anti-rotation mechanism (5) includes a circumferential limiting structure located between the two ends of the anti-rotation mechanism (5) for circumferential limiting when the two ends of the anti-rotation mechanism (5) move relative to each other.

4. The pneumatic diaphragm actuator according to claim 3, characterized in that: The anti-rotation mechanism (5) also includes A fixing part (501) is provided on the membrane cover (1); A sliding part (502) is provided on the diaphragm (2); The sliding part (502) and the fixed part (501) are slidably connected. The circumferential limiting structure is disposed between the sliding part (502) and the fixed part (501) and extends for a certain length to restrict the circumferential rotation between the sliding part (502) and the fixed part (501). Preferably, the sliding part (502) and the fixed part (501) are interlocked, and the cross section of the sliding part is polygonal; Preferably, the circumferential limiting structure is a slide rail structure or a slider groove structure.

5. The pneumatic diaphragm actuator according to any one of claims 1-4, characterized in that: It also includes a tray assembly (3) disposed on the side of the diaphragm (2) near the vent (102); The anti-rotation mechanism (5) is disposed between the tray assembly (3) and the membrane cover (1).

6. The pneumatic diaphragm actuator according to claim 5, characterized in that: It also includes an elastic component (8) disposed between the tray assembly (3) and the membrane cover (1); The elastic component (8) is sleeved on the anti-rotation mechanism (5), and the elastic component (8) extends along the setting direction of the anti-rotation mechanism (5); Preferably, the elastic component (8) includes The first elastic element (801) is sleeved on the anti-rotation mechanism (5) and is spaced apart from the anti-rotation mechanism (5); The second elastic element (802) is located between the first elastic element (801) and the anti-rotation mechanism (5), and is in the same spiral direction as the first elastic element (801).

7. The pneumatic diaphragm actuator according to any one of claims 1-6, characterized in that: Also includes A limiting block (9) is provided at one end of the push rod (4) near the tray assembly (3), and the limiting block (9) moves back and forth with the push rod (4); The stroke adjustment mechanism (10) is movably disposed on the membrane cover (1); One end of the stroke adjustment mechanism (10) extends into the cavity (103). The stroke adjustment mechanism (10) is arranged opposite to the limiting block (9) and is used to adjust the working stroke of the diaphragm (2).

8. The pneumatic diaphragm actuator according to any one of claims 1-7, characterized in that: The vent (102) has a rainproof mechanism (11); The rainproof mechanism (11) has multiple channels to prevent rainwater from entering the cavity (103).

9. The pneumatic diaphragm actuator according to any one of claims 1-8, characterized in that: The membrane cover (1) includes The lower membrane cover (105) is slidably connected to the push rod (4). The upper membrane cover (104) is fastened to the lower membrane cover (105); The cavity (103) is formed between the lower membrane cover (105) and the upper membrane cover (104); Preferably, the lower membrane cover (105) and the upper membrane cover (104) are detachably connected by a connecting assembly (12); Preferably, the two ends of the diaphragm (2) are located between the lower diaphragm cover (105) and the upper diaphragm cover (104), and are respectively fixed by the corresponding connecting components (12).

10. A pneumatic actuator, characterized in that: Includes the pneumatic diaphragm actuator as described in any one of claims 1 to 9.

Images