Pneumatic actuator for vacuum devices

Abstract

The embodiment of the application provides a kind of pneumatic actuator for vacuum device, including shell, the inside of shell is separated by diaphragm and is formed with inner cavity and outer cavity, outer cavity is communicated with atmosphere, inner cavity is communicated to atmosphere or vacuum, diaphragm can be elastically deformed under the action of pressure difference on its two sides;Diaphragm is connected with the one end of connecting rod, the other end of connecting rod is from the shell;One side of shell is provided with actuator, actuator is sequentially provided with first connecting point, second connecting point and third connecting point along its length direction;First connecting point is hinged with the other end of connecting rod, second connecting point is hinged with shell, and reset spring is connected between third connecting point and shell, actuator can reciprocate under the action of diaphragm and reset spring;Pressure difference can be directly formed by using atmosphere and vacuum of vacuum device, structure is simple, and operation is safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of actuators, specifically to a pneumatic actuator for a vacuum device. Background Technology

[0002] Vacuum devices typically use actuators to perform functions such as opening and closing valves.

[0003] If a pneumatic actuator powered by compressed air is used in a vacuum device, an additional compressed air pipeline is required. This is not only inconvenient, but compressed air also poses certain dangers.

[0004] If an electric actuator is used in a vacuum device, the electric actuator has a complex structure, the alternating current is dangerous, and the frequent start-stop cycles result in a high failure rate. Utility Model Content

[0005] In view of this, embodiments of the present invention provide a pneumatic actuator for vacuum devices that is simple in structure, safe and reliable in operation, and can utilize vacuum materials locally.

[0006] This utility model provides a pneumatic actuator for a vacuum device, comprising a housing, wherein the interior of the housing is divided into an inner cavity and an outer cavity by a diaphragm, the outer cavity being in communication with the atmosphere, and the inner cavity being in communication with the atmosphere or a vacuum through a three-way valve; the diaphragm is capable of elastic deformation under the action of a pressure difference on both sides; the diaphragm is fixedly connected to one end of a connecting rod, and the other end of the connecting rod extends out of the housing; An actuator rod is provided on one side of the housing. A first connection point, a second connection point, and a third connection point are sequentially arranged on the actuator rod along its length. The first connection point is hinged to the other end of the connecting rod, the second connection point is hinged to the housing, and a return spring is connected between the third connection point and the housing.

[0007] Optionally, the housing includes a first housing and a second housing, with the outer edge of the diaphragm sandwiched between the first housing and the second housing and pressed and sealed by the first housing and the second housing.

[0008] Optionally, an annular deformable portion protruding toward the inner cavity is formed on the diaphragm.

[0009] Optionally, a pressure plate is installed at the center of the diaphragm, and one end of the connecting rod is fixedly connected to the pressure plate.

[0010] Optionally, the outer cavity is an open cavity with one side open.

[0011] Optionally, the actuator is located on the side away from the inner cavity.

[0012] Optionally, the three-way valve is a normally open solenoid valve.

[0013] The present invention has the following advantages: the diaphragm divides the interior of the housing into an inner cavity and an outer cavity. The outer cavity is connected to the atmosphere, and the inner cavity is connected to the atmosphere or a vacuum. The diaphragm can undergo elastic deformation under the action of the pressure difference on both sides and drive the actuator rod to move through the connecting rod. With the help of the return spring, the actuator rod can move back and forth to complete the execution action. The material can be directly sourced locally, and the vacuum of the vacuum device and the atmosphere can be used to form a pressure difference. The structure is simple and the operation is safe and reliable. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; The numbers in the image represent: 1. Housing; 11. First housing; 12. Second housing; 2. Diaphragm; 21. Annular deformable part; 3. Inner cavity; 4. Outer cavity; 5. Three-way valve; 6. Connecting rod; 7. Pressure plate; 8. Actuating rod; 81. First connection point; 82. Second connection point; 83. Third connection point; 9. Return spring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "center," "length," "left," "right," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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 limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0018] Please see Figure 1 As shown, an embodiment of this utility model provides a pneumatic actuator for a vacuum device, including a housing 1. The interior of the housing 1 is divided by a diaphragm 2 to form an inner cavity 3 and an outer cavity 4. The outer cavity 4 is connected to the atmosphere, while the inner cavity 3 is connected to the atmosphere or a vacuum (which can be directly utilized by the vacuum device) through a three-way valve 5. For reference, the outer cavity 4 can be designed as an open cavity with one side open; the three-way valve 5 can be a normally open solenoid valve.

[0019] Furthermore, in this embodiment of the present invention, the housing 1 includes a first housing 11 and a second housing 12, and the outer edge of the diaphragm 2 is sandwiched between the first housing 11 and the second housing 12 and is pressed and sealed by the first housing 11 and the second housing 12.

[0020] One end of the connecting rod 6 is fixedly connected to the diaphragm 2, and the other end of the connecting rod 6 protrudes from the housing 1. To facilitate connection, a pressure plate 7 is installed at the center of the diaphragm 2 in this embodiment of the invention, and one end of the connecting rod 6 is fixedly connected to the pressure plate 7. When connecting, care should be taken not to damage the sealing performance of the diaphragm 2.

[0021] The diaphragm 2 can undergo elastic deformation under the pressure difference on both sides, thereby driving the connecting rod 6 to move. Furthermore, an annular deformable part 21 protruding towards the inner cavity 3 can be formed on the diaphragm 2 to facilitate the deformation of the diaphragm 2.

[0022] An actuator 8 is provided on one side of the housing 1. A first connection point 81, a second connection point 82 and a third connection point 83 are arranged sequentially along the length of the actuator 8. The first connection point 81 is hinged to the other end of the connecting rod 6, the second connection point 82 is hinged to the housing 1, and a return spring 9 is connected between the third connection point 83 and the housing 1.

[0023] Furthermore, the actuator 8 can be positioned on the side away from the inner cavity 3, allowing the connecting rod 6 to pass through from the outer cavity 4 and connect with the actuator 8, thus avoiding the impact of the inner cavity 3 on the sealing performance of the casing.

[0024] Working principle: When the inner cavity 3 is connected to the vacuum through the three-way valve 5, the pressure in the inner cavity 3 is less than the pressure in the outer cavity 4. Under the action of the pressure difference, the diaphragm 2 undergoes elastic deformation towards the inner cavity 3, thereby driving the connecting rod 6 to move to the left. Driven by the connecting rod 6, the actuator 8 rotates counterclockwise by a certain angle around the second connection point 82, and the reset spring 9 is stretched by force.

[0025] When the inner cavity 3 is connected to the atmosphere through the three-way valve 5, the pressure in the inner cavity 3 is equal to the pressure in the outer cavity 4. The actuator 8 can rotate clockwise around the second connection point 82 by a certain angle under the elastic restoring force of the return spring 9, and at the same time drive the diaphragm 2 to reset through the connecting rod 6.

[0026] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pneumatic actuator for a vacuum device, characterized in that: The device includes a housing, the interior of which is divided into an inner cavity and an outer cavity by a diaphragm. The outer cavity is in communication with the atmosphere, and the inner cavity is in communication with the atmosphere or a vacuum through a three-way valve. The diaphragm is capable of elastic deformation under the action of the pressure difference on both sides. The diaphragm is fixedly connected to one end of a connecting rod, and the other end of the connecting rod extends out of the housing. An actuator rod is provided on one side of the housing. A first connection point, a second connection point, and a third connection point are sequentially arranged on the actuator rod along its length. The first connection point is hinged to the other end of the connecting rod, the second connection point is hinged to the housing, and a return spring is connected between the third connection point and the housing.

2. The pneumatic actuator for a vacuum device according to claim 1, characterized in that: The housing includes a first housing and a second housing, and the outer edge of the diaphragm is sandwiched between the first housing and the second housing and is pressed and sealed by the first housing and the second housing.

3. A pneumatic actuator for a vacuum device according to claim 1, characterized in that: The diaphragm has an annular deformable portion that protrudes toward the inner cavity.

4. A pneumatic actuator for a vacuum device according to claim 1, characterized in that: A pressure plate is installed at the center of the diaphragm, and one end of the connecting rod is fixedly connected to the pressure plate.

5. A pneumatic actuator for a vacuum device according to claim 1, characterized in that: The outer cavity is an open cavity with one side open.

6. A pneumatic actuator for a vacuum device according to claim 1, characterized in that: The actuator is located on the side away from the inner cavity.

7. A pneumatic actuator for a vacuum device according to claim 1, characterized in that: The three-way valve is a normally open solenoid valve.

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