Pneumatic actuator with sufficient pressure

Abstract

The utility model discloses a pneumatic actuator with sufficient pressure, which comprises an air cylinder, a first piston, a piston rod and a piston cavity, and further comprises a second piston movably mounted in the piston cavity; wherein the second piston is positioned above the first piston; the guide assembly is arranged in the air cylinder; wherein the first piston and the second piston are both mounted on the guide assembly; the guide assembly comprises a pair of guide rods which are fixedly connected into the air cylinder and penetrate through the first piston and the second piston. The springs are respectively sleeved outside the guide rods; wherein the pair of springs are fixedly connected between the first piston and the second piston respectively, in daily production and life, through the arrangement of the first piston and the second piston, the stress area of air pressure is increased, and therefore the use pressure is increased.

Description

Technical Field

[0001] The utility model relates to a pneumatic actuator. Background Art

[0002] A pneumatic actuator is an actuator that uses air pressure to drive the opening and closing or adjustment of a valve. It is also called a pneumatic actuator or a pneumatic device, and is generally popularly called a pneumatic head. It often also comes with a valve positioner, which uses the feedback principle to improve the performance of the actuator, so that the actuator can accurately position according to the control signal of the controller. The cylinder includes a cylindrical cylinder block, and the two ends of the cylinder block are respectively provided with a first end cover and a second end cover that close the openings. The first end cover and the second end cover are arranged in a direction away from the base. An installation rod is arranged around the outside of the cylinder block between the first end cover and the second end cover. Generally, the number of installation rods is more than six, resulting in a large number of installation parts for the end covers, a complex installation structure, and inconvenient installation.

[0003] An existing actuator with a simple structure, such as a pneumatic actuator with sufficient pressure with the patent number CN212900029U, includes a base installed above the valve and a cylinder installed on the side of the base. A piston, a piston rod and a piston chamber are arranged inside the cylinder. The cylinder includes a cylindrical cylinder block, and the two ends of the cylinder block are respectively provided with a first end cover and a second end cover that close the openings. The first end cover and the second end cover are arranged in a direction away from the base. An installation rod is arranged between the first end cover and the second end cover. Installation threads are provided at both ends of the installation rod. The installation rod is in threaded cooperation with the first end cover. The installation rod passes through the second end cover and is locked to the second end cover by a bolt. The installation rod is located inside the piston chamber. The piston is provided with a guide hole for the installation rod to pass through and is in movable sealing cooperation with it. The second end cover is provided with an installation through hole for the installation rod to pass through. The installation through hole is in sealing cooperation with the installation rod.

[0004] This embodiment can achieve the effects of a simple structure and a beautiful appearance, but its existing defects are:

[0005] 1. The internal use space of the cylinder is limited and it cannot achieve a very high use pressure;

[0006] 2. During the movement of the piston rod, the sealing performance at the lower connection of the piston rod will deteriorate. Summary of the Invention

[0007] The utility model aims to solve one of the technical problems existing in the prior art.

[0008] The present application provides a pneumatic actuator with sufficient pressure, including a cylinder, a first piston, a piston rod and a piston chamber, and further includes:

[0009] A second piston, which is movably installed inside the piston chamber;

[0010] Wherein, the second piston is located above the first piston.

[0011] Further included are:

[0012] A guiding assembly which is arranged inside the cylinder;

[0013] Wherein, both the first piston and the second piston are installed on the guiding assembly.

[0014] The guiding assembly includes:

[0015] A pair of guiding rods which are respectively fixedly connected inside the cylinder and pass through the first piston and the second piston;

[0016] A pair of springs which are respectively sleeved outside each guiding rod;

[0017] Wherein, the pair of springs are respectively fixedly connected between the first piston and the second piston.

[0018] Further included are:

[0019] A clearance hole which is arranged in the middle of the second piston;

[0020] Wherein, the diameter of the clearance hole is larger than the top diameter of the piston rod.

[0021] Further included are:

[0022] A bracket which is fixedly connected to the lower end of the cylinder through a connecting flange;

[0023] A sealing assembly which is installed on the bracket;

[0024] Wherein, the piston rod is movably inserted into the sealing assembly.

[0025] The sealing assembly includes:

[0026] A pair of support rods whose outer ends are respectively fixedly connected to the inner two ends of the bracket;

[0027] A sealing ring which is fixedly connected between the inner ends of the pair of support rods;

[0028] An activated carbon layer which is arranged inside the sealing ring;

[0029] A sealing layer which is installed inside the activated carbon layer;

[0030] Wherein, the inner wall of the sealing layer fits the outer wall of the piston rod.

[0031] The beneficial effects of the present utility model are as follows:

[0032] 1. By providing the first piston and the second piston, the stress area of the air pressure is increased, thereby increasing the use pressure;

[0033] 2. Through the arrangement of the support rod and the sealing ring, during the movement of the piston rod, the connection at the lower end of the piston rod always maintains tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. 1 is a schematic structural diagram of a pneumatic actuator with sufficient pressure in an embodiment of the present application;

[0035] Figure 2 FIG. 2 is a schematic internal structure diagram of the sealing ring in an embodiment of the present application.

[0036] REFERENCE SIGNS

[0037] 1 - Cylinder, 2 - First piston, 3 - Piston rod, 4 - Piston chamber, 5 - Second piston, 6 - Guide assembly, 7 - Guide rod, 8 - Spring, 9 - Clearance hole, 10 - Bracket, 11 - Sealing assembly, 12 - Support rod, 13 - Sealing ring, 14 - Activated carbon layer, 15 - Sealing layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present application will be clearly described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0039] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order different from those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0040] Next, with reference to the drawings, the servo provided in the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0041] Embodiment 1:

[0042] As Figure 1 shown, the embodiment of the present application provides a pneumatic actuator with sufficient pressure, including a cylinder 1, a first piston 2, a piston rod 3 and a piston chamber, and further including: a second piston 4 movably installed in the piston chamber; wherein, the second piston 4 is located above the first piston 2.

[0043] Further, it further includes a guiding component 6, which is arranged inside the cylinder 1; wherein, the first piston 2 and the second piston 4 are both mounted on the guiding component 6.

[0044] Further, the guiding component 6 includes a pair of guiding rods 7, which are respectively fixedly connected inside the cylinder 1 and pass through the first piston 2 and the second piston 4; a pair of springs 8, which are respectively sleeved outside each guiding rod 7; wherein, the pair of springs 8 are respectively fixedly connected between the first piston 2 and the second piston 4.

[0045] Further, it further includes a clearance hole 9, which is arranged in the middle of the second piston 4; wherein, the diameter of the clearance hole 9 is larger than the top diameter of the piston rod 3.

[0046] In this embodiment of the present application, due to the adoption of the above structure, during the use of the pneumatic actuator, the piston rod 3 drives the first piston 2 to move up and down in the piston cavity of the cylinder 1. During the upward movement of the piston rod 3, it drives the first piston 2 to move upward along the piston cavity. At the same time, the spring 8 pushes the upper second piston 4 to move together. Since the thrust spring 8 of the first piston 2 will have a certain shortening phenomenon, at this time, the contact area between the first piston 2 and the second piston 4 and the internal air pressure of the cylinder 1 in the piston cavity increases, thereby increasing the overall air pressure of the piston and being able to avoid that the piston can have a very high operating pressure in different environments. During the movement of the first piston 2 and the second piston 4, they both move along the direction of the guiding rod 7, and the guiding rod 7 plays a guiding role to ensure the stability of the movement of the first piston 2 and the second piston 4. A clearance hole 9 is arranged in the middle of the second piston 4 to prevent the top of the piston rod 3 from interfering with the second piston 4 when the second piston 4 and the first piston 2 move to the maximum limit.

[0047] Embodiment 2:

[0048] As Figure 1 、 Figure 2 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, it further includes: a bracket 10, which is fixedly connected to the lower end of the cylinder 1 through a connecting flange; a sealing component 11, which is mounted on the bracket 10; wherein, the piston rod 3 is movably inserted into the sealing component 11.

[0049] Further, the sealing component 11 includes a pair of support rods 12, the outer ends of which are respectively fixedly connected to the inner two ends of the bracket 10; a sealing ring 13, which is fixedly connected between the inner ends of the pair of support rods 12; an activated carbon layer 14, which is arranged inside the sealing ring 13; a sealing layer 15, which is mounted inside the activated carbon layer 14; wherein, the inner wall of the sealing layer 15 is in fit with the outer wall of the piston rod 3.

[0050] In this embodiment of the present application, due to the adoption of the above structure, during the movement of the piston rod 3, the lower end of the piston rod 3 is located outside, and there will be a phenomenon of air leakage. It is necessary to provide a sealing assembly 11 at the connection of the lower end of the piston rod 3 to avoid air leakage. The cylinder 1 and the bracket 10 are connected through a connecting flange. On both inner walls of the bracket 10, support rods 12 are fixedly connected. A sealing ring 13 is fixedly connected between a pair of support rods 12. The upper end of the sealing ring 13 contacts the connection end of the bracket 10 and the piston rod 3, and the piston rod 3 passes through the sealing ring 13. An activated carbon layer 14 and a sealing layer 15 are sequentially arranged in the sealing ring 13. When external moisture adheres to the outer wall of the piston rod 3, during the movement of the piston rod 3, the activated carbon layer 14 will adsorb the moisture to ensure the dryness of the outer wall of the piston rod 3. The inner wall of the sealing layer 15 fits with the outer wall of the piston rod 3 to ensure that during the movement of the piston rod 3, the sealing performance is still ensured and the phenomenon of air leakage is avoided.

[0051] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0052] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can still make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A pneumatic actuator with sufficient pressure, comprising a cylinder (1), a first piston (2), a piston rod (3) and a piston chamber (4), characterized in that, Further included are: A second piston (5), which is movably installed in the piston chamber (4); Wherein, the second piston (5) is located above the first piston (2).

2. The pneumatic actuator with sufficient pressure according to claim 1, characterized in that, Further included are: A guiding assembly (6), which is arranged inside the cylinder (1); Wherein, both the first piston (2) and the second piston (5) are installed on the guiding assembly (6).

3. A pneumatic actuator with sufficient pressure according to claim 2, characterized in that, The guiding assembly (6) includes: A pair of guiding rods (7), which are respectively fixedly connected inside the cylinder (1) and pass through the first piston (2) and the second piston (5); A pair of springs (8), which are respectively sleeved outside each guiding rod (7); Wherein, a pair of the springs (8) are respectively fixedly connected between the first piston (2) and the second piston (5).

4. A pneumatic actuator with sufficient pressure according to claim 1, characterized in that, Further included are: A clearance hole (9), which is arranged in the middle of the second piston (5); Wherein, the diameter of the clearance hole (9) is larger than the top diameter of the piston rod (3).

5. A pneumatic actuator with sufficient pressure according to claim 1, characterized in that, Further included are: A bracket (10), which is fixedly connected to the lower end of the cylinder (1) through a connecting flange; A sealing assembly (11), which is installed on the bracket (10); Wherein, the piston rod (3) is movably inserted into the sealing assembly (11).

6. A pneumatic actuator with sufficient pressure according to claim 5, characterized in that, The sealing assembly (11) includes: A pair of support rods (12), whose outer ends are respectively fixedly connected to the inner two ends of the bracket (10); A sealing ring (13), which is fixedly connected between the inner ends of a pair of the support rods (12); An activated carbon layer (14), which is arranged inside the sealing ring (13); A sealing layer (15), which is installed inside the activated carbon layer (14); Wherein, the inner wall of the sealing layer (15) is in fit with the outer wall of the piston rod (3).

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