Differential pressure type pneumatic actuator
By designing a differential pressure pneumatic actuator with an adjustment cylinder and a fixing mechanism, the problem of difficulty in opening the valve when the air source is disconnected is solved, and labor-saving operation is achieved in the absence of air source and the valve remains open.
Patent Information
- Application Number
- CN202420858467.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-23
AI Technical Summary
When the air source is disconnected, it is difficult to manually reopen the valve after closing, and it is impossible to keep the valve open. It requires manual overcoming of the spring force, which is difficult and inconvenient to operate.
A differential pressure pneumatic actuator including a housing, a valve stem, a spring connecting plate, an adjustment cylinder and a fixing mechanism is designed. By rotating the adjustment cylinder, the valve stem is driven up to open the valve by using the adjustment rod and the handle rod, and Keep the valve open by perforation and fixing rod.
In the absence of air source, the valve can be opened more effort and effectively maintained in the open state, reducing operation difficulty and effort consumption.
Smart Images
Figure CN222297117U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pneumatic structures, and more specifically relates to a differential pressure pneumatic actuator. Background Art
[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve. It is also called a pneumatic actuator or a pneumatic device, but it is generally referred to as a pneumatic head. Currently, most of the starting actuators are differential pressure structures. One end of the valve is driven by a cylinder and a piston, and the other end directly uses a spring. For example, the starting actuator disclosed in publication number CN219102171U inflates the cylinder, and the piston drives the valve to move, while compressing the spring. After the cylinder is disconnected from the inflation, the spring force drives the valve to move, thereby realizing the opening and closing of the valve.
[0003] When the valve is open and the air source is accidentally disconnected, the flow channel will be closed. Usually, in order to ensure the sealing of the flow channel when it is closed, the elasticity of the spring is relatively large. In the technology disclosed in the above patent, it is difficult to manually drive the valve to overcome the elastic force of the spring to reopen the valve, and there is no fixed mechanism to keep the valve open. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a differential pressure pneumatic actuator which can manually open a valve with less effort when there is no air source, and can also keep the valve in an open state after the valve is manually punched.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a differential pressure pneumatic actuator, comprising a shell, a valve stem slidably connected to the shell, a spring connecting plate slidably connected inside the shell, an adjusting cylinder rotatably connected above the spring connecting plate, the outer side surface of the adjusting cylinder is threadedly connected to the upper end of the shell, the valve stem is slidably connected to the spring connecting plate, the end of the valve stem passes through the spring connecting plate and extends into the adjusting cylinder, an adjusting rod is arranged on the end of the valve stem, and the adjusting rod is fixedly connected to the valve stem, and a fixing mechanism is arranged between the adjusting rod and the adjusting cylinder.
[0006] Furthermore, the fixing mechanism includes a fixing rod penetrating the top end of the adjusting rod, and the fixing rod can pull out the adjusting rod, the adjusting rod is provided with a through hole near the valve stem, and a handle rod is provided above the fixing rod.
[0007] Furthermore, a protrusion is provided on the side of the spring connecting plate facing the adjusting cylinder, a first annular groove and a first retaining ring are provided on the protrusion, a second annular groove is provided at the bottom of the adjusting cylinder, and a second retaining ring is formed between the retaining groove and the bottom surface of the adjusting cylinder, the first retaining ring extends into the second annular groove, and the second retaining ring extends into the first annular groove.
[0008] Furthermore, a guide hole is provided at the top end of the adjusting cylinder, and the adjusting rod is threadedly connected to the guide hole.
[0009] Furthermore, the bottom end of the adjusting rod is fixedly connected to the thread of the valve stem.
[0010] Furthermore, a sealing ring is provided between the spring connecting plate and the valve stem.
[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: when there is no air source, the adjusting cylinder is rotated to drive the spring connecting plate to rise and release the spring elastic force. When the spring connecting plate is at the top, the elastic force of the spring can be greatly released, and then the adjusting rod is pulled upward by the handle rod on the adjusting rod, and at the same time, the valve stem is driven to rise to open the valve. At this time, the valve stem can be pulled up more effortlessly due to the small spring elastic force; when the through hole on the adjusting rod is exposed outside the adjusting cylinder, the adjusting rod on the adjusting rod is pulled out, inserted into and passed through the through hole, and the adjusting rod can be contacted with the top surface of the adjusting cylinder so that the adjusting rod no longer drops and retracts, and the valve can be kept in an open state. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structure of the differential pressure pneumatic actuator of the utility model;
[0013] Figure 2 It is a structural schematic diagram of the differential pressure pneumatic actuator of the utility model when the regulating cylinder releases the spring force;
[0014] Figure 3 It is a structural schematic diagram of the differential pressure pneumatic actuator of the utility model when the regulating rod pulls up the valve stem;
[0015] Figure 4 for Figure 3 Enlarged view of part A in the middle.
[0016] Figure numerals: housing 1; valve stem 2; spring connecting plate 3; adjusting cylinder 4; adjusting rod 5; fixing rod 6; through hole 7; handle rod 8; protrusion 9; first annular groove 10; first clamping ring 11; second annular groove 12; second clamping ring 13; guide hole 14; sealing ring 15. DETAILED DESCRIPTION
[0017] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.
[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.
[0019] Reference Figures 1 to 4 The utility model is further described.
[0020] A differential pressure pneumatic actuator comprises a shell 1, a valve stem 2 is slidably connected to the shell 1, a spring connecting plate 3 is slidably connected inside the shell 1, an adjusting cylinder 4 is rotatably connected above the spring connecting plate 3, the outer side surface of the adjusting cylinder 4 is threadedly connected to the upper end of the shell 1, the valve stem 2 is slidably connected to the spring connecting plate 3, the end of the valve stem 2 passes through the spring connecting plate 3 and extends into the adjusting cylinder 4, an adjusting rod 5 is arranged on the end of the valve stem 2, and the adjusting rod 5 is fixedly connected to the valve stem 2, and a fixing mechanism is arranged between the adjusting rod 5 and the adjusting cylinder 4.
[0021] like Figure 1 As shown, in this example, preferably, the fixing mechanism includes a fixing rod 6 penetrating the top end of the adjusting rod 5, and the fixing rod 6 can pull out the adjusting rod 5, the adjusting rod 5 is provided with a through hole 7 near the valve stem 2, and a handle rod 8 is provided above the fixing rod 6.
[0022] like Figure 4 As shown, in this example, preferably, a protrusion 9 is provided on the side of the spring connecting plate 3 facing the adjusting cylinder 4, a first annular groove 10 and a first retaining ring 11 are provided on the protrusion 9, a second annular groove 12 is provided at the bottom of the adjusting cylinder 4, and a second retaining ring 13 is formed between the retaining groove and the bottom surface of the adjusting cylinder 4, the first retaining ring 11 extends into the second annular groove 12, and the second retaining ring 13 extends into the first annular groove 10.
[0023] like Figure 1As shown, in this example, preferably, a guide hole 14 is provided at the top end of the adjusting cylinder 4 , and the adjusting rod 5 is threadedly connected to the guide hole 14 .
[0024] Preferably in this example, the bottom end of the adjusting rod 5 is fixedly connected to the thread of the valve stem 2, and when the actuator is in normal use, the adjusting rod 5 can be removed to lower the height of the actuator.
[0025] like Figure 4 As shown, in this example, preferably, a sealing ring 15 is provided between the spring connecting plate 3 and the valve stem 2 .
[0026] like Figures 1 to 3 As shown, during normal operation, the spring connecting plate 3 is fixed by the threaded connection of the adjusting cylinder 4. When there is no air source and the valve connected to the valve stem 2 needs to be opened, the adjusting cylinder 4 can be rotated first, and the rotating adjusting cylinder 4 rises, and drives the spring connecting plate 3 to rise, so that the spring inside the shell 1 begins to release the elastic force. When the spring connecting plate 3 is located at the top inside the shell 1, the elastic force of the spring can be greatly released, and then the adjusting rod 5 is pulled upward by the handle rod 8 on the adjusting rod 5, and the valve stem 2 is driven to rise at the same time. At this time, due to the small elastic force of the spring, the valve stem 2 can be pulled up more effortlessly;
[0027] When the through hole 7 on the adjusting rod 5 is exposed outside the adjusting cylinder 4, the valve on the valve stem 2 is fully opened. At this time, the adjusting rod 5 on the adjusting rod 5 is pulled out, inserted into and passed through the through hole 7, and the handle rod 8 is released. The adjusting rod 5 contacts the top surface of the adjusting cylinder 4 so that the adjusting rod 5 no longer drops and retracts, and the valve can be kept in the open state.
[0028] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. A differential pressure pneumatic actuator, characterized in that: It includes a shell, a valve stem is slidably connected to the shell, a spring connecting plate is slidably connected inside the shell, an adjusting cylinder is rotatably connected above the spring connecting plate, the outer side surface of the adjusting cylinder is threadedly connected to the upper end of the shell, the valve stem is slidably connected to the spring connecting plate, the end of the valve stem passes through the spring connecting plate and extends into the adjusting cylinder, an adjusting rod is arranged on the end of the valve stem, and the adjusting rod is fixedly connected to the valve stem, and a fixing mechanism is arranged between the adjusting rod and the adjusting cylinder.
2. The differential pressure pneumatic actuator according to claim 1, characterized in that: The fixing mechanism includes a fixing rod penetrating the top end of the adjusting rod, and the fixing rod can be pulled out of the adjusting rod. The adjusting rod is provided with a through hole near the valve stem, and a handle rod is provided above the fixing rod.
3. The differential pressure pneumatic actuator according to claim 2, characterized in that: A protrusion is provided on the side of the spring connecting plate facing the adjusting cylinder, a first annular groove and a first retaining ring are provided on the protrusion, a second annular groove is provided at the bottom of the adjusting cylinder, and a second retaining ring is formed between the retaining groove and the bottom surface of the adjusting cylinder, the first retaining ring extends into the second annular groove, and the second retaining ring extends into the first annular groove.
4. The differential pressure pneumatic actuator according to claim 3, characterized in that: A guide hole is arranged at the top end of the adjusting cylinder, and the adjusting rod is threadedly connected with the guide hole.
5. The differential pressure pneumatic actuator according to claim 4, characterized in that: The bottom end of the regulating rod is fixedly connected with the thread of the valve stem.
6. The differential pressure pneumatic actuator according to claim 5, characterized in that: A sealing ring is arranged between the spring connecting plate and the valve stem.