Vertical rotary pneumatic execution device

Abstract

The utility model relates to the technical field of valve control, in particular to a vertical rotary pneumatic execution device which comprises a cylinder body, a piston, an elastic piece, a transmission shaft, a connecting seat and a conversion shaft. The piston is slidably mounted in the cylinder body; the elastic piece is arranged in the cylinder body and can push the piston to move downwards; one end of the transmission shaft is connected with the piston, and the other end radially protrudes to form a sliding part; the connecting seat is hollow inside and is mounted below the cylinder body; the conversion shaft is used for being connected with a valve and rotationally installed in the connecting base, the transmission shaft penetrates through the conversion shaft, a track groove extending spirally is formed in the periphery of the conversion shaft, the sliding part is embedded in the track groove in a sliding mode, and the transmission shaft can drive the conversion shaft to rotate in the axial direction when moving linearly. The vertical rotary pneumatic execution device is high in overall compactness, capable of providing the output characteristic of large torque, capable of achieving rapid reset under the pressure loss condition and high in safety.

Description

Technical Field

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

[0002] With the continuous development of modernization, valve technology also needs to adapt to the development of new products and needs to have the performance to withstand harsh working conditions.

[0003] Currently, most valves are opened and closed using pneumatic actuators, which are driven mechanisms that use gas as power to open and close valves or other equipment. Existing pneumatic actuators are mostly horizontally mounted on the valve, occupying a significant amount of horizontal space. In situations requiring skid-mounted installations, this type of horizontal pneumatic actuator cannot meet the requirements of minimal space occupation and compact device design. Furthermore, when the external gas supply system fails, existing pneumatic actuators cannot react quickly enough to help the valve reset and close rapidly, ensuring the safety of the device. Utility Model Content

[0004] The purpose of this utility model is to provide a vertical rotary pneumatic actuator to solve the problems of poor compactness of existing pneumatic actuators and inability to quickly reset and close valves when the air supply pressure system fails.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A vertical rotary pneumatic actuator, comprising:

[0007] Cylinder block;

[0008] The piston is slidably mounted in the cylinder body;

[0009] An elastic element, disposed within the cylinder, is capable of pushing the piston downwards;

[0010] The drive shaft has one end connected to the piston and the other end has a sliding part protruding radially, and the piston can drive the drive shaft to move linearly.

[0011] The connecting seat is hollow inside and is installed below the cylinder body;

[0012] A conversion shaft is used to connect to a valve. The conversion shaft is rotatably installed in the connecting seat. The transmission shaft passes through the conversion shaft. The outer circumference of the conversion shaft is provided with a spirally extending track groove. The sliding part is slidably embedded in the track groove. When the transmission shaft moves linearly, it can drive the conversion shaft to rotate axially.

[0013] Optionally, the vertical rotary pneumatic actuator further includes a stop plate, which is installed in a through hole at the bottom of the cylinder. The outer periphery of the drive shaft is provided with a guide groove along the axial direction, and the inner peripheral wall of the stop plate is provided with a guide key extending along the axial direction. The guide groove and the guide key are slidably connected.

[0014] Optionally, the sliding part includes a pin and a roller sleeve. One end of the pin is fixedly connected to the drive shaft, and the other end is fitted with the roller sleeve, which is in rolling connection with the track groove.

[0015] Optionally, the pin is threaded or riveted to the drive shaft.

[0016] Optionally, the spiral trajectory of the track groove is an unequal-distance spiral curve.

[0017] Optionally, multiple elastic elements are provided, and the multiple elastic elements are evenly spaced apart.

[0018] Optionally, multiple sliding parts are provided, and the multiple sliding parts are evenly spaced along the circumferential direction of the transmission shaft. The number of track grooves is the same as the number of sliding parts, and the sliding parts and track grooves are slidably connected in a one-to-one correspondence.

[0019] Optionally, the cylinder body includes an upper flange, a middle flange, a lower flange, a support cylinder, and a cylinder barrel. The upper flange, the middle flange, and the support cylinder form a storage space for installing and accommodating the elastic element. The middle flange has a through hole for the elastic element to pass through. The middle flange, the lower flange, and the cylinder barrel form a gas chamber, and the piston is slidably installed in the gas chamber.

[0020] Optionally, the vertical rotary pneumatic actuator further includes a thrust bearing, and the upper and / or lower shoulders of the conversion shaft are respectively provided with the thrust bearing.

[0021] Optionally, the vertical rotary pneumatic actuator further includes a lock nut, and one end of the drive shaft is inserted into the piston and connected to the lock nut.

[0022] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0023] This vertical rotary pneumatic actuator features a vertical structure, making full use of the space above the valve and facilitating skid-mounting. Through the cooperation of a drive shaft and a conversion shaft, the linear motion of the piston is converted into the rotary motion of the conversion shaft. The conversion shaft is connected to the valve, and its rotation opens and closes the valve, providing sufficient torque for operation. Furthermore, with the continuous downward pressure of the elastic element, in the event of a failure in the air supply pressure system, the elastic element can push the piston to quickly reset, allowing the valve to rotate and close rapidly. This vertical rotary pneumatic actuator boasts a compact design, provides high torque output, and achieves rapid reset in the event of pressure loss, ensuring high safety. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the vertical rotary pneumatic actuator described in the disclosed embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram showing the connection between the drive shaft and the conversion shaft according to the disclosed embodiment of this utility model.

[0027] in:

[0028] 1. Cylinder block; 11. Upper flange; 12. Middle flange; 13. Lower flange; 14. Support cylinder; 15. Cylinder barrel; 2. Piston; 3. Elastic element; 4. Drive shaft; 41. Sliding part; 411. Pin; 412. Roller sleeve; 42. Guide groove; 5. Connecting seat; 6. Converter shaft; 61. Track groove; 7. Stop plate; 8. Thrust bearing; 9. Lock nut;

[0029] 100. Storage space; 200. Air cavity. Detailed Implementation

[0030] To better understand the aforementioned objectives, features, and advantages of this utility model, the disclosed solutions will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments disclosed in the present invention, and not all of them.

[0032] like Figure 1 As shown, this embodiment provides a vertical rotary pneumatic actuator, which includes a cylinder 1, a piston 2, an elastic element 3, a drive shaft 4, a connecting seat 5, and a conversion shaft 6. The piston 2 is slidably installed inside the cylinder 1; the elastic element 3 is located inside the cylinder 1 and can push the piston 2 downward; one end of the drive shaft 4 is connected to the piston 2, and the other end has a sliding part 41 protruding radially, so that the piston 2 can drive the drive shaft 4 to move linearly; the connecting seat 5 is hollow inside and installed below the cylinder 1; the conversion shaft 6 is used to connect to a valve. In this embodiment, the valve is a rotary valve commonly used in the field. The conversion shaft 6 is rotatably installed inside the connecting seat 5, and the drive shaft 4 passes through the conversion shaft 6. The outer periphery of the conversion shaft 6 is provided with a spirally extending track groove 61, and the sliding part 41 is slidably embedded in the track groove 61. When the drive shaft moves linearly, it can drive the conversion shaft 6 to rotate axially.

[0033] In the initial state, the elastic element 3 pushes the piston 2 against the bottom wall of the cylinder 1 under its elastic action. At this time, the valve connected to the conversion shaft 6 is in the closed state. When it is necessary to open the valve, high-pressure gas is injected into the lower part of the piston 2. The high-pressure gas pushes the piston 2 upward, and the elastic element 3 is continuously compressed. The piston 2 drives the transmission shaft 4 to move upward. Since the sliding part 41 of the transmission shaft 4 is in rolling cooperation with the track groove 61, and the track groove 61 extends in a spiral shape, when the transmission shaft 4 moves linearly, the sliding part 41 slides in the track groove 61, which causes the conversion shaft 6 to rotate axially. This converts the axial linear motion of the transmission shaft 4 into the rotational motion of the conversion shaft 6. While the conversion shaft 6 rotates, it drives the valve below it to rotate synchronously, thus opening the valve. When the air supply pressure system fails, the force on the lower part of the piston 2 decreases. Under the pushing action of the elastic element 3, the piston 2 quickly returns to the initial position. The rotation of the conversion shaft 6 drives the valve to close. The piston 2 can quickly reset in the event of air supply pressure failure, improving safety.

[0034] The vertical rotary pneumatic actuator of this embodiment converts the linear motion of piston 2 into the rotary motion of conversion shaft 6 through the cooperation of transmission shaft 4 and conversion shaft 6. Conversion shaft 6 is connected to a valve, and its rotation enables the valve to open and close. Furthermore, with the continuous downward pressure of elastic element 3, in the event of a failure in the air supply pressure system, elastic element 3 can push piston 2 to quickly reset, allowing the valve to quickly rotate and close. This vertical rotary pneumatic actuator is highly compact, provides high torque output characteristics, and achieves rapid reset in the event of pressure loss, ensuring high safety.

[0035] Optionally, to prevent slight axial rotation of the drive shaft 4 during its vertical linear movement, a stop disc 7 is installed at the through hole at the bottom of the cylinder body 1 in this embodiment. The stop disc 7 is fixedly installed at the bottom of the cylinder body 1 by fasteners. The inner peripheral wall of the stop disc 7 is provided with a guide key extending axially. Correspondingly, such as Figure 2 As shown, a guide groove 42 is provided on the outer periphery of the drive shaft 4 along the axial direction. The guide key on the stop plate 7 is inserted into the guide groove 42 on the drive shaft 4 and is slidably connected with the guide groove 42 to limit the drive shaft 4 to only perform linear motion and prevent the drive shaft 4 from rotating axially.

[0036] Optionally, such as Figure 1 and Figure 2 As shown, the sliding part 41 in this embodiment includes a pin 411 and a roller sleeve 412. One end of the pin 411 is fixedly connected to the transmission shaft 4. Specifically, the pin 411 is threaded or riveted to the transmission shaft 4. The other end of the pin 411 is fitted with a roller sleeve 412, which can rotate relative to the pin 411. The roller sleeve 412 is rolled in connection with the track groove 61 and can roll within the track groove 61. This converts the sliding friction generated when the roller sleeve 412 slides within the track groove 61 into rolling friction, reducing the coefficient of friction, reducing wear, improving mechanical efficiency, and extending service life.

[0037] Optionally, in this embodiment, as Figure 2 As shown, the spiral trajectory of the track groove 61 is an unequal-pitch spiral curve, meaning the pitch at both ends of each track groove 61 is greater than the pitch in the middle section. This allows the rotational speed of the switching shaft 6 to accelerate from zero during valve opening and closing, reducing the impact when starting the valve; then it rotates at a constant speed to ensure efficient valve opening; and finally, it decelerates to reduce the impact when closing the valve. Therefore, this process achieves three actions—acceleration, constant speed, and deceleration—during valve opening and closing, reducing the impact on the valve.

[0038] Optionally, such as Figure 2 As shown, this embodiment has multiple sliding parts 41, which are evenly spaced along the circumference of the drive shaft 4. The number of track grooves 61 is the same as the number of sliding parts 41, and the sliding parts 41 and track grooves 61 are slidably connected in a one-to-one correspondence. Preferably, there are four sliding parts 41 and four track grooves 61, which are preferably evenly distributed around the circumference to ensure that a sufficiently large torque or switching torque can be provided.

[0039] Optionally, such as Figure 1 As shown, the elastic element 3 in this embodiment is a spring. Multiple elastic elements 3 can be provided, evenly spaced apart, to provide sufficient thrust to the piston 2, ensuring uniform force distribution on the piston 2. It is understood that the elastic element 3 is always in a compressed state, meaning it only provides a downward thrust to the piston 2. Alternatively, this embodiment can use only one elastic element 3 to achieve the same principle, but this embodiment preferably uses four. The number of elastic elements 3 includes, but is not limited to, the number shown in the accompanying drawings of this embodiment.

[0040] Optionally, such as Figure 1 As shown, the cylinder body 1 in this embodiment includes an upper flange 11, a middle flange 12, a lower flange 13, a support cylinder 14, and a cylinder barrel 15. The upper flange 11, the middle flange 12, and the support cylinder 14 form a storage space 100 for installing and accommodating the elastic element 3. The middle flange 12 has a through hole for the elastic element 3 to pass through. Optionally, one end of the elastic element 3 is connected to the upper flange 11, and the other end passes through the middle flange 12 and is connected to the piston 2. The middle flange 12, the lower flange 13, and the cylinder barrel 15 form a gas chamber 200 for accommodating the piston 2. The piston 2 is slidably installed in the gas chamber 200 and moves linearly up and down within the gas chamber 200.

[0041] Optionally, the vertical rotary pneumatic actuator also includes a thrust bearing 8, such as... Figure 1 As shown, in this embodiment, thrust bearings 8 are respectively provided on the upper and lower shoulders of the conversion shaft 6. The thrust bearings 8 are used to bear axial loads and limit the conversion shaft 6, so that the conversion shaft 6 can only rotate axially and prevent the conversion shaft 6 from moving axially. In addition, other methods can also be used to limit the conversion shaft 6, including but not limited to the method shown in this embodiment.

[0042] Optionally, such as Figure 1 As shown, the vertical rotary pneumatic actuator also includes a lock nut 9. The end of the drive shaft 4 connected to the piston 2 is provided with a threaded section. After the drive shaft 4 and the piston 2 are inserted and connected, the drive shaft 4 and the piston 2 are connected by the lock nut 9 to the threaded section at the end of the drive shaft 4, thereby realizing the connection between the drive shaft 4 and the piston 2.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vertical rotary pneumatic actuator, characterized in that, include: Cylinder block (1); Piston (2) is slidably mounted inside cylinder (1); An elastic element (3) is provided inside the cylinder (1) and is able to push the piston (2) downward. The drive shaft (4) is connected to the piston (2) at one end and has a sliding part (41) protruding radially at the other end. The piston (2) can drive the drive shaft (4) to move linearly. The connecting seat (5) is hollow inside and is installed below the cylinder body (1); A conversion shaft (6) is used to connect to a valve. The conversion shaft (6) is rotatably installed in the connecting seat (5). The transmission shaft (4) passes through the conversion shaft (6). The outer periphery of the conversion shaft (6) is provided with a spirally extending track groove (61). The sliding part (41) is slidably embedded in the track groove (61). When the transmission shaft (4) moves linearly, it can drive the conversion shaft (6) to rotate axially.

2. The vertical rotary pneumatic actuator according to claim 1, characterized in that, The vertical rotary pneumatic actuator also includes a stop plate (7), which is installed in the through hole at the bottom of the cylinder (1). The outer periphery of the transmission shaft (4) is provided with a guide groove (42) along the axial direction. The inner periphery of the stop plate (7) is provided with a guide key extending along the axial direction. The guide groove (42) is slidably connected to the guide key.

3. The vertical rotary pneumatic actuator according to claim 1, characterized in that, The sliding part (41) includes a pin (411) and a roller sleeve (412). One end of the pin (411) is fixedly connected to the transmission shaft (4), and the other end is equipped with the roller sleeve (412). The roller sleeve (412) is tumbledly connected to the track groove (61).

4. The vertical rotary pneumatic actuator according to claim 3, characterized in that, The pin (411) is threaded or riveted to the transmission shaft (4).

5. The vertical rotary pneumatic actuator according to claim 1, characterized in that, The spiral trajectory of the track groove (61) is an unequal-distance spiral curve.

6. The vertical rotary pneumatic actuator according to claim 1, characterized in that, Multiple elastic elements (3) are provided, and the multiple elastic elements (3) are evenly spaced.

7. The vertical rotary pneumatic actuator according to claim 1, characterized in that, The sliding part (41) is provided in multiple ways. The multiple sliding parts (41) are evenly spaced along the circumference of the transmission shaft (4). The number of the track grooves (61) is the same as the number of the sliding parts (41). The sliding parts (41) and the track grooves (61) are slidably connected in a one-to-one correspondence.

8. The vertical rotary pneumatic actuator according to any one of claims 1-7, characterized in that, The cylinder body (1) includes an upper flange (11), a middle flange (12), a lower flange (13), a support cylinder (14), and a cylinder barrel (15). The upper flange (11), the middle flange (12), and the support cylinder (14) form a storage space (100) for installing and accommodating the elastic element (3). The middle flange (12) has a through hole for the elastic element (3) to pass through. The middle flange (12), the lower flange (13), and the cylinder barrel (15) form a gas chamber (200). The piston (2) is slidably installed in the gas chamber (200).

9. The vertical rotary pneumatic actuator according to any one of claims 1-7, characterized in that, The vertical rotary pneumatic actuator also includes a thrust bearing (8), and the upper and / or lower shoulders of the conversion shaft (6) are respectively provided with the thrust bearing (8).

10. The vertical rotary pneumatic actuator according to any one of claims 1-7, characterized in that, The vertical rotary pneumatic actuator also includes a lock nut (9), and one end of the transmission shaft (4) is inserted into the piston (2) and connected to the lock nut (9).

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