Pressure relief pneumatic actuator

Abstract

According to the technical scheme, the pressure relief pneumatic actuator is characterized in that the pressure relief pneumatic actuator comprises an actuator body and an air pressure detection assembly, an air inlet and an air outlet are formed in the actuator body, and the air pressure detection assembly is used for detecting air pressure changes in the actuator body; a pressure relief opening is formed in the actuator body, a pressure relief pipe, a control assembly and a plugging piston are arranged in the actuator body, a vent groove communicated with an inner cavity of the actuator body is formed in the side wall of the pressure relief pipe, and the vent groove extends in the length direction of the pressure relief pipe; one end of the pressure relief pipe is communicated with the pressure relief opening, the blocking piston is connected with the control assembly, slidably connected into the pressure relief pipe and the vent groove and used for blocking communication of the vent groove and the pressure relief opening, the pneumatic actuator can reduce the gas outflow velocity of the pressure relief opening, and therefore sufficient detection time is provided for the air pressure detection assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pneumatic actuator, more specifically, it relates to a pressure relief pneumatic actuator. BACKGROUND

[0002] Pneumatic actuator is a kind of actuator using gas, usually compressed air, as power source, it is usually used to control valve, gate, ball valve and other fluid control equipment.Pneumatic actuator is usually composed of two parts: pneumatic drive device and actuator, pneumatic drive device refers to using gas energy to push a piston or diaphragm to realize the opening and closing of valve and actuator.

[0003] The existing pneumatic actuator is driven by injecting compressed air into the air inlet to work, and the air outlet is used to maintain the stability of the pneumatic actuator, but the noise will be generated when the air outlet is discharged, so the designer usually adds a silencer structure to the air outlet, but due to the increase of the silencer structure, the air inlet quantity of the air inlet is greater than the air outlet quantity of the air outlet, and with the continuous work of the pneumatic actuator, the internal air pressure will also increase, thereby affecting the accuracy of the actuator of the pneumatic actuator.

[0004] Therefore, the company has developed a kind of pneumatic actuator with pressure relief function, the publication number is CN221880401U, by means of air pressure detection assembly and pressure relief assembly, when the internal pressure is too large, the pressure relief effect is realized, however, due to the size of the parts, it is found that when the pressure relief port is opened, the instantaneous air outlet quantity is relatively large, thereby affecting the large change of internal air pressure, which is not convenient for accurate control, so the pressure relief port needs to be further improved. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a kind of pressure relief pneumatic actuator, which can reduce the gas outflow velocity of pressure relief port, thereby giving sufficient detection time to air pressure detection assembly.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a kind of pressure relief pneumatic actuator, including actuator body and air pressure detection assembly, the actuator body is provided with air inlet hole and air outlet hole, the air pressure detection assembly is used to detect the air pressure change in actuator body;

[0007] The actuator body is provided with pressure relief port, the actuator body is provided with pressure relief pipe, control assembly and plugging piston, the side wall of the pressure relief pipe is provided with ventilation groove communicated with the inner cavity of the actuator body, and the ventilation groove is arranged along the length direction of the pressure relief pipe;

[0008] One end of the pressure relief pipe is connected to the pressure relief port, and the sealing piston is connected to the control component and is slidably connected in the pressure relief pipe and the venting groove to block the connection between the venting groove and the pressure relief port.

[0009] The present invention is further configured such that: the sealing piston includes a piston body and a piston block, the piston body is circular in shape, the piston body is slidably connected to the pressure relief pipe and is connected to the control component;

[0010] The piston block is connected to one side of the piston body and is slidably connected within the venting groove.

[0011] The present invention is further configured such that: a sealing plate is provided extending from one end of the piston block toward the pressure relief port, and the pressure relief pipe is provided with a insertion hole for inserting the sealing plate.

[0012] The present invention is further configured such that the width of the sealing plate is smaller than the width of the venting groove.

[0013] The present invention is further configured such that: the control component includes a control motor, a transmission gear set, a transmission screw, and a transmission cylinder, wherein the control motor is linked to the transmission screw through the transmission gear set;

[0014] The transmission cylinder is slidably connected to the transmission screw.

[0015] The present invention is further configured such that: a threaded groove is provided through the transmission cylinder, and connecting arms are provided on both sides of the transmission cylinder, the connecting arms being used to connect with the sealing piston.

[0016] The present invention is further configured such that: the first end of the transmission cylinder is provided with a connecting groove that cooperates with the transmission screw, and the second end of the transmission cylinder is connected to the sealing piston.

[0017] The present invention is further configured such that: the transmission gear set includes a first gear and a second gear that mesh with each other, the first gear is connected to a control motor, and the second gear is connected to a transmission screw.

[0018] The present invention is further configured such that: the pressure relief pipe includes a first pipe body and a second pipe body, the first pipe body and the second pipe body are welded together, the inner diameter of the second pipe body is larger than the outer diameter of the first pipe body, and an abutting edge that abuts against the first pipe body is provided inside the second pipe body.

[0019] In summary, this utility model has the following beneficial effects: by controlling the sealing piston to move away from the pressure relief port, a portion of the venting groove is connected to the pressure relief port. When the two are connected, the gas inside the actuator body will be depressurized through the pressure relief port. As the sealing piston gradually moves away from the pressure relief port, the connection area between the two will further increase, and the pressure relief effect will be enhanced. Conversely, as the sealing piston approaches the pressure relief port, the connection area between the two will decrease, and the pressure relief effect will weaken. The position of the sealing piston can be adjusted to meet various pressure relief needs. Attached Figure Description

[0020] Figure 1 A three-dimensional structural diagram of a pressure relief pneumatic actuator;

[0021] Figure 2 A three-dimensional structural diagram of the control component;

[0022] Figure 3 A three-dimensional structural diagram of the piston sealing position;

[0023] Figure 4 A three-dimensional structural diagram showing the separation of control components;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the second tube.

[0025] Reference numerals: 1. Actuator body; 11. Air outlet; 12. Pressure relief port; 2. Air pressure detection component; 3. Pressure relief pipe; 31. Vent groove; 32. Insertion hole; 4. Control component; 41. Control motor; 42. Transmission gear set; 43. Transmission screw; 44. Transmission cylinder; 5. Sealing piston; 51. Piston body; 52. Piston block; 53. Sealing plate; 6. First tube body; 7. Second tube body; 71. Abutment edge. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0027] Reference Figures 1 to 5 As shown, in order to achieve the above objectives, the present invention provides the following technical solution: a pressure relief pneumatic actuator, comprising an actuator body 1 and a pressure detection component 2, wherein the actuator body 1 is provided with an air inlet and an air outlet 11, and the pressure detection component 2 is used to detect the pressure change inside the actuator body 1.

[0028] The actuator body 1 is provided with a pressure relief port 12. The actuator body 1 is provided with a pressure relief pipe 3, a control component 4 and a sealing piston 5. The side wall of the pressure relief pipe 3 is provided with a venting groove 31 that communicates with the inner cavity of the actuator body 1. The venting groove 31 extends along the length of the pressure relief pipe 3.

[0029] One end of the pressure relief pipe 3 is connected to the pressure relief port 12. The sealing piston 5 is connected to the control component 4 and is slidably connected in the pressure relief pipe 3 and the venting groove 31 to block the connection between the venting groove 31 and the pressure relief port 12.

[0030] The design of this utility model uses the control component 4 to drive the sealing piston 5 to move away from the pressure relief port 12, thereby making part of the venting groove 31 connected with the pressure relief port 12. When the two are connected, the gas in the actuator body 1 will be depressurized through the pressure relief port 12. As the sealing piston 5 gradually moves away from the pressure relief port 12, the connection area between the two will further increase, and the pressure relief effect will be enhanced. Conversely, as the sealing piston 5 moves closer to the pressure relief port 12, the connection area between the two will decrease, and the pressure relief effect will weaken. The position of the sealing piston 5 can be adjusted to meet various pressure relief needs.

[0031] The present invention is further configured such that: the sealing piston 5 includes a piston body 51 and a piston block 52, the piston body 51 is circular in shape, the piston body 51 is slidably connected to the pressure relief pipe 3, and is connected to the control component 4.

[0032] The piston block 52 is connected to one side of the piston body 51 and is slidably connected to the vent groove 31.

[0033] The design of this structure can isolate the gas flow between the actuator body 1 and the pressure relief port 12 by blocking the piston 5. In addition, during the movement, it can adjust the area of ​​the venting groove 31 and guide the blocking piston 5.

[0034] The present invention is further configured such that: a sealing plate 53 is provided on one end of the piston block 52 facing the pressure relief port 12, and a plug hole 32 is provided on the pressure relief pipe 3 for inserting the sealing plate 53.

[0035] The width of the sealing plate 53 is smaller than the width of the venting groove 31.

[0036] like Figure 3 and Figure 4 As shown, the design of the sealing plate 53 allows the sealing piston 5 to be considered in two states during its movement. State 1: The sealing plate 53 and the pipe body gradually misalign, and the gas will flow out through the gap between the sealing plate 53 and the pressure relief pipe 3. At this time, when the sealing piston 5 moves a unit distance, the venting groove 31 and the pressure relief port 12 are connected, and the area of ​​the increased area is relatively small.

[0037] State 2: The blocking piston 5 continues to move away. At this time, the blocking plate 53 is completely misaligned with the pipe body. When the blocking piston 5 moves a unit distance, the venting groove 31 and the pressure relief port 12 are connected, and the area is greatly increased.

[0038] The air pressure detection component 2 can be implemented in various ways, including using the detection method mentioned in the company's prior application or other existing technologies.

[0039] The present invention is further configured such that: the control component 4 includes a control motor 41, a transmission gear set 42, a transmission screw 43 and a transmission cylinder 44, wherein the control motor 41 is linked with the transmission screw 43 through the transmission gear set 42;

[0040] The transmission cylinder 44 is slidably connected to the transmission screw 43.

[0041] The design of this structure allows the transmission screw 43 to rotate via the transmission gear set 42 when the control motor 41 is started, thereby driving the transmission cylinder 44 to move.

[0042] Example 1 of transmission cylinder 44: A threaded groove is provided through the transmission cylinder 44, and connecting arms are provided on both sides of the transmission cylinder 44. The connecting arms are used to connect with the sealing piston 5.

[0043] Transmission cylinder 44, Example 2: Figure 4 As shown, the first end of the transmission cylinder 44 is provided with a connecting groove that mates with the transmission screw 43, and the second end of the transmission cylinder 44 is connected to the sealing piston 5.

[0044] The transmission gear set 42 includes a first gear and a second gear that mesh with each other. The first gear is connected to the control motor 41, and the second gear is connected to the transmission screw 43.

[0045] This utility model is further configured such that: the pressure relief pipe 3 includes a first pipe body and a second pipe body, the first pipe body and the second pipe body are welded together, the inner diameter of the second pipe body is larger than the outer diameter of the first pipe body, and an abutment edge is provided inside the second pipe body to abut against the first pipe body. This structural design facilitates the processing of the vent groove 31 and the insertion hole 32.

[0046] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A pressure relief pneumatic actuator, comprising an actuator body (1) and a pressure detection component (2), wherein the actuator body (1) is provided with an air inlet and an air outlet (11), and the pressure detection component (2) is used to detect changes in air pressure within the actuator body (1); Its characteristics are: The actuator body (1) is provided with a pressure relief port (12), and the actuator body (1) is provided with a pressure relief pipe (3), a control component (4) and a sealing piston (5). The side wall of the pressure relief pipe (3) is provided with a venting groove (31) that communicates with the inner cavity of the actuator body (1). The venting groove (31) extends along the length of the pressure relief pipe (3). One end of the pressure relief pipe (3) is connected to the pressure relief port (12), and the blocking piston (5) is connected to the control component (4) and is slidably connected in the pressure relief pipe (3) and the venting groove (31) to block the connection between the venting groove (31) and the pressure relief port (12).

2. The pressure relief pneumatic actuator according to claim 1, characterized in that: The blocking piston (5) includes a piston body (51) and a piston block (52). The piston body (51) is circular in shape. The piston body (51) is slidably connected to the pressure relief pipe (3) and connected to the control component (4). The piston block (52) is connected to one side of the piston body (51) and is slidably connected to the vent groove (31).

3. A pressure relief pneumatic actuator according to claim 2, characterized in that: The piston block (52) has a sealing plate (53) extending towards the pressure relief port (12), and the pressure relief pipe (3) has a plug hole (32) for inserting the sealing plate (53).

4. A pressure relief pneumatic actuator according to claim 3, characterized in that: The width of the sealing plate (53) is smaller than the width of the venting groove (31).

5. A pressure relief pneumatic actuator according to claim 1, characterized in that: The control component (4) includes a control motor (41), a transmission gear set (42), a transmission screw (43), and a transmission cylinder (44). The control motor (41) is linked to the transmission screw (43) through the transmission gear set (42). The transmission cylinder (44) is slidably connected to the transmission screw (43).

6. A pressure relief pneumatic actuator according to claim 5, characterized in that: The transmission cylinder (44) has a threaded groove through it, and connecting arms are provided on both sides of the transmission cylinder (44). The connecting arms are used to connect with the sealing piston (5).

7. A pressure relief pneumatic actuator according to claim 5, characterized in that: The first end of the transmission cylinder (44) is provided with a connecting groove that cooperates with the transmission screw (43), and the second end of the transmission cylinder (44) is connected to the sealing piston (5).

8. A pressure relief pneumatic actuator according to claim 5, characterized in that: The transmission gear set (42) includes a first gear and a second gear that mesh with each other. The first gear is connected to the control motor (41), and the second gear is connected to the transmission screw (43).

9. A pressure relief pneumatic actuator according to any one of claims 1 to 8, characterized in that: The pressure relief pipe (3) includes a first pipe body (6) and a second pipe body (7), which are welded together. The inner diameter of the second pipe body (7) is larger than the outer diameter of the first pipe body (6), and an abutment edge (71) that abuts against the first pipe body (6) is provided inside the second pipe body (7).

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