Oil-forbidding corrugated pipe internal pressure pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, in particular to an oil-forbidding corrugated pipe internal pressure pneumatic actuator, which is characterized in that a plurality of supporting parts are arranged on the outer side of a corrugated pipe part, are connected with a valve cover part and are used for supporting the corrugated pipe part in the valve cover part; the annular supporting ring and the valve deck are connected through the multiple rotation stopping parts, the annular supporting ring is prevented from inclining when moving up and down, so that the torsion condition is avoided when the corrugated pipe stretches out and draws back, the self weight of the annular supporting ring with the U-shaped cross section is reduced, the increased weight of the corrugated pipe is small, and the sensitivity of sensing gas pressure changes cannot be affected. Under the combined action of the rotation stopping part, the annular supporting ring, the first supporting set and the second supporting set, the supporting force on the corrugated pipe is increased, the sensitivity of the corrugated pipe for sensing gas pressure changes is not affected, meanwhile, the corrugated pipe can be prevented from twisting, the situation that the corrugated pipe loses sealing performance due to damage caused by twisting is avoided, and the service life of the corrugated pipe is prolonged. And therefore, the oil-forbidding corrugated pipe internal pressure pneumatic actuator is out of action.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator technology, and in particular to an oil-free bellows internal pressure pneumatic actuator. Background Technology

[0002] The oil-free bellows internal pressure pneumatic actuator is a special type of pneumatic valve. Its core component is the bellows assembly, which is generally made of metal materials, such as stainless steel. It has good flexibility and sealing performance. It can expand and contract when the internal pressure changes, while preventing media leakage. It is especially suitable for special requirements such as oil-free applications, avoiding the oil leakage problems that may occur with traditional sealing methods. Connected to the bellows is a pressure chamber, which is used to introduce compressed air to generate pressure that causes the bellows to expand and contract. By controlling the entry and exit of compressed air, the internal pressure of the bellows can be regulated.

[0003] The Chinese patent for a double bellows valve with application number CN201310485496.1 improves the support strength of the bellows by setting a spacer ring on the outer wall of the bellows. However, there is no limiting device between the spacer ring and the valve cover. The bellows is prone to rotation and damage when it expands and contracts, thus losing its sealing performance and causing the pneumatic actuator with internal pressure in the oil-free bellows to malfunction. Utility Model Content

[0004] The main purpose of this utility model is to provide an oil-free bellows internal pressure pneumatic actuator to solve the problem in related technologies where there is no limiting device between the spacer ring and the valve cover, and the bellows is prone to rotation and damage during expansion and contraction, thus losing its sealing performance.

[0005] To achieve the above objectives, according to one aspect of the present invention, an oil-free bellows internal pressure pneumatic actuator is provided, comprising: a valve body portion, wherein the valve body portion is installed in a gas pipeline to provide a channel for gas flow;

[0006] A receiving orifice is provided inside the valve body, and the receiving orifice includes a piston for adjusting the size of the valve body channel.

[0007] Valve cover portion, which is located above the valve body portion, is used to support and control the bellows portion;

[0008] The bellows section is located inside the valve cover section and is used to drive the piston to move up and down;

[0009] The support portion comprises several parts, all of which are located outside the bellows portion and connected to the valve cover portion, for supporting the bellows portion inside the valve cover portion.

[0010] Furthermore, the valve body includes a valve body, an air inlet, an air outlet, and an air guide pipe. The air inlet is fixedly located on the left side of the valve body, the air outlet is fixedly located on the right side of the valve body, and the bottom end of the air guide pipe is connected to the air outlet.

[0011] Furthermore, the valve cover portion includes a valve cover assembly, a valve stem, and a handwheel. The valve cover assembly includes a valve cover and several sliding grooves. The valve cover is fixedly mounted on the top of the valve body. The sliding grooves are all vertically arranged on the inner wall of the valve cover. The valve stem passes through the valve cover and is located on the valve cover. The handwheel is fixedly mounted on the top of the valve stem.

[0012] Furthermore, the receiving orifice also includes an orifice assembly, a compression spring, and a fixing plate. The orifice assembly includes a transverse hole, a limiting hole, and a stop hole. The transverse hole is disposed transversely within the valve body, the limiting hole is disposed vertically within the valve body and located above the transverse hole, and the stop hole is disposed vertically within the valve body and located below the transverse hole. The stop hole and the limiting hole are located on the same straight line. The piston is rotatably sleeved on the bottom end of the valve stem, and the fixing plate is fixedly sleeved on the bottom end of the valve stem and located below the piston. The compression spring is located inside the stop hole, with its bottom end fixedly connected to the valve body and its top end rotatably connected to the fixing plate.

[0013] Furthermore, the bellows section includes a bellows, a top plate, and a bottom plate. The top plate is fixedly disposed at the top of the bellows and at the lower surface of the top of the valve cover. The top plate is connected to the valve stem. The bottom plate is fixedly disposed at the bottom of the bellows and is rotatably connected to the valve stem. The top of the air guide pipe is connected to the bellows.

[0014] Furthermore, the support portion includes an annular support ring, several support components, and several anti-rotation portions. The support components are all fixedly connected to the annular support ring. The support components include a first support group and a second support group. The anti-rotation portions include an anti-rotation rod, a connecting block, and a slider.

[0015] Furthermore, the first support group includes a plurality of first support rods, the second support group includes a plurality of second support rods, the tail ends of the plurality of first support rods are fixedly connected to form the first support group, the ends of the plurality of second support rods are fixedly connected to form the second support group, and both ends of the first support rods and the second support rods are fixedly connected to an annular support ring.

[0016] Furthermore, the annular support ring is fixedly sleeved on the outer ring of the bellows, the anti-rotation rod is fixedly connected to the annular support ring through a connecting block, and the anti-rotation rod is slidably connected to the slide groove through a slider.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the first support group and the second support group have the same structure but are set in opposite directions, resisting the deformation of the annular support ring from both the top and bottom, and providing its overall stability; multiple anti-rotation parts connect the annular support ring to the valve cover, preventing the annular support ring from tilting when moving up and down, thereby avoiding the occurrence of torsion when the bellows expands and contracts; the U-shaped cross-section of the annular support ring reduces its weight, and the added weight of the bellows is small, so it will not affect the sensitivity of sensing changes in gas pressure; the anti-rotation parts, the annular support ring, the first support group and the second support group work together to increase the support force on the bellows without affecting the sensitivity of the bellows to sensing changes in gas pressure, and at the same time prevent the bellows from torsion, avoiding damage due to torsion and loss of sealing, which would cause the oil-free bellows internal pressure pneumatic actuator to malfunction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the support structure of this utility model;

[0021] Figure 4 This is a cross-sectional view of the support part of this utility model;

[0022] Figure 5 This is a schematic diagram of the first support group structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the second support group structure of this utility model;

[0024] Figure 7 This is a sectional view of the valve cover of this utility model;

[0025] Figure 8 This is a diagram showing the connection between the base plate and the valve stem of this utility model.

[0026] Illustration:

[0027] 1. Valve body; 11. Valve body; 12. Air inlet; 13. Air outlet; 14. Air guide pipe;

[0028] 2. Valve cover section; 21. Valve cover assembly; 22. Valve stem; 23. Handwheel; 211. Valve cover; 212. Slide groove;

[0029] 3. Receiving hole; 31. Horizontal hole; 32. Limiting hole; 33. Abutment hole; 34. Compression spring; 35. Fixing plate; 36. Piston;

[0030] 4. Corrugated pipe section; 41. Corrugated pipe; 42. Top plate; 43. Bottom plate;

[0031] 5. Support part; 51. Annular support ring; 52. First support group; 53. Second support group; 54. Anti-rotation part; 55. Anti-rotation rod; 56. Connecting block; 57. Slider; 521. First support rod; 531. Second support rod. Detailed Implementation

[0032] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0033] Please see Figures 1 to 8 This embodiment provides an oil-free bellows internal pressure pneumatic actuator, including: a valve body 1, which is installed in a gas pipeline to provide a channel for gas flow;

[0034] The orifice 3 is disposed inside the valve body 1. The orifice 3 includes a piston 36, which is used to adjust the size of the channel of the valve body 1.

[0035] Valve cover 2 is located above valve body 1 and is used to support and control bellows section 4.

[0036] Bellows section 4 is located inside valve cover section 2 and is used to drive piston 36 to move up and down.

[0037] Support part 5, there are several support parts 5, all of which are located outside the bellows part 4 and connected to the valve cover part 2, and are used to support the bellows part 4 inside the valve cover part 2.

[0038] The valve body 1 includes a valve body 11, an air inlet 12, an air outlet 13, and an air guide pipe 14. The air inlet 12 is fixedly located on the left side of the valve body 11, the air outlet 13 is fixedly located on the right side of the valve body 11, and the bottom end of the air guide pipe 14 is connected to the air outlet 13.

[0039] The valve cover part 2 includes a valve cover assembly 21, a valve stem 22, and a handwheel 23. The valve cover assembly 21 includes a valve cover 211 and several sliding grooves 212. The valve cover 211 is fixedly mounted on the top of the valve body 11. The sliding grooves 212 are all vertically mounted on the inner wall of the valve cover 211. The valve stem 22 passes through the valve cover 211 and is mounted on the valve cover 211. The valve stem 22 can rotate along the valve cover 211 and slide up and down along the valve cover 211. The handwheel 23 is fixedly mounted on the top of the valve stem 22.

[0040] The valve cover 211 is a hollow cylindrical body with both its upper and lower ends closed. A first through hole is provided at the center of both the upper and lower ends. The valve stem 22 passes through the two first through holes. Under the action of external force, the valve stem 22 can move freely up and down along the two first through holes while the valve stem 22 can rotate independently. In addition, a sealing ring is provided between the valve stem 22 and the two first through holes to ensure the sealing of the connection between the two.

[0041] The receiving orifice 3 also includes an orifice assembly, a compression spring 34, and a fixing plate 35. The orifice assembly includes a transverse hole 31, a limiting hole 32, and a stop hole 33. The transverse hole 31 is arranged transversely within the valve body 11, the limiting hole 32 is arranged vertically within the valve body 11 and is located above the transverse hole 31, and the stop hole 33 is arranged vertically within the valve body 11 and is located below the transverse hole 31. The stop hole 33 and the limiting hole 32 are located on the same straight line. The piston 36 is rotatably sleeved on the bottom end of the valve stem 22, and the fixing plate 35 is fixedly sleeved on the bottom end of the valve stem 22 and is located below the piston 36. The compression spring 34 is located within the stop hole 33. The bottom end of the compression spring 34 is fixedly connected to the valve body 11, and the top end is rotatably connected to the fixing plate 35.

[0042] The piston 36 is connected to the valve stem 22 by a bearing. The valve stem 22 passes through the inner ring of the bearing and is fixed thereto. The piston 36 is sleeved on the outer ring of the bearing and fixed thereto, so that the piston 36 can not only rotate around the valve stem 22, but also move up and down with the valve stem 22.

[0043] The lower end of the stop hole 33 is threaded, and the outer ring of the fixing plate 35 is also threaded. When no external force is applied, the compression spring 34 pushes the piston 36 away from the transverse hole 31. When it is necessary to close the transverse hole 31, press the handwheel 23 down. The fixing plate 35 squeezes the compression spring 34 to contract it. The fixing plate 35 contacts the thread of the stop hole 33. Turn the handwheel 23. The handwheel 23 drives the fixing plate 35 to screw into the stop hole 33 through the valve stem 22 and is fixed by its thread, so that the piston 36 blocks the transverse hole 31 and the actuator is closed.

[0044] The bellows section 4 includes a bellows 41, a top plate 42, and a bottom plate 43. The top plate 42 is fixedly disposed at the top of the bellows 41 and at the lower surface of the top of the valve cover 211. The top plate 42 is connected to the valve stem 22. The valve stem 22 can rotate along the top plate 42 and slide up and down along the top plate 42. The bottom plate 43 is fixedly disposed at the bottom of the bellows 41 and is rotatably connected to the valve stem 22. The top of the air guide pipe 14 is connected to the bellows 41.

[0045] The top plate 42 is provided with a second through hole at the center. The valve stem 22 passes through the second through hole and can move freely up and down along the second through hole under the action of external force. At the same time, the valve stem 22 can rotate independently. In addition, a sealing ring is provided between the valve stem 22 and the second through hole to ensure the sealing of the connection between the two.

[0046] The base plate 43 has a through-hole in the middle, and an annular groove is provided in the middle of the second through-hole. The valve stem 22 is fixed with an annular protrusion (such as...) on its outer ring. Figure 8 As shown, the annular protrusion is located in the annular groove and can rotate along the annular groove. The annular protrusion drives the valve stem 22 to move up and down synchronously with the base plate 43. A sealing ring is provided between the annular protrusion and the annular groove to ensure the sealing at the connection between the two.

[0047] The bellows 41 is an oil-free bellows. The oil-free bellows has good sealing performance and strong corrosion resistance, which can prevent oil substances from entering the interior of the bellows 41 from the outside, and also prevent the internal medium from leaking and coming into contact with oil, thereby ensuring the normal operation of the system and the purity of the medium.

[0048] The support part 5 includes an annular support ring 51, several support components and several anti-rotation parts 54. The support components are all fixedly connected to the annular support ring 51. The support components include a first support group 52 and a second support group 53. The anti-rotation parts 54 include an anti-rotation rod 55, a connecting block 56 and a slider 57. The annular support ring 51 has a U-shaped cross-section, which can reduce the weight of the air. The U-shaped groove is used to accommodate the first support group 52 and the second support group 53.

[0049] The first support group 52 includes a plurality of first support rods 521, and the second support group 53 includes a plurality of second support rods 531. The tails of the plurality of first support rods 521 are fixedly connected to form the first support group 52, and the ends of the plurality of second support rods 531 are fixedly connected to form the second support group 53. Both ends of the first support rods 521 and the second support rods 531 are fixedly connected to the annular support ring 51. The first support group 52 and the second support group 53 have the same structure, but are set in opposite directions to resist the deformation of the annular support ring 51 from both the top and bottom directions, thus providing overall stability.

[0050] The annular support ring 51 is fixedly sleeved on the outer ring of the bellows 41. The anti-rotation rod 55 is fixedly connected to the annular support ring 51 through the connecting block 56. The anti-rotation rod 55 is slidably connected to the slide groove 212 through the slider 57.

[0051] Install the actuator on the gas pipeline with the inlet 12 in the gas pipeline's inlet direction and the outlet 13 in the gas pipeline's outlet direction. Turn the handwheel 23, which drives the fixed plate 35 to rotate via the valve stem 22, disengaging it from the thread of the stop hole 33. The thread of the stop hole 33 loses its restriction on the fixed plate 35, causing the compression spring 34 to rebound. This pushes the piston 36 upwards via the fixed plate 35, disengaging it from the transverse hole 31. The valve is opened, and gas flows into the transverse hole 31 through the inlet 12 and then out through the outlet 13. Part of the gas, after passing through the transverse hole 31, enters the inner cavity of the bellows 41 via the guide pipe 14. The pressure inside the bellows 41 increases, causing the valve stem 22 to move downwards via the base plate 43. The end of the valve stem 22 pushes the piston 36 downwards along the limit hole 32, and part of the piston 36 enters the transverse hole 31. When the cross section of 31 is blocked, the gas flow channel is reduced, and the gas pressure in the outlet 13 decreases. Since the air guide pipe 14 connects the bellows 41 and the outlet 13, the gas pressure in the bellows 41 also decreases accordingly. When the elastic force of the compression spring 34 is greater than the gas pressure in the bellows 41, the piston 36 moves upward along the limiting hole 32, the effective cross section of the transverse hole 31 increases, the amount of gas flowing through it increases, and the pressure in the bellows 41 increases accordingly. When the elastic force of the compression spring 34 is less than or equal to the gas pressure in the bellows 41, the piston 36 is completely located in the limiting hole 32, and the effective flow area of ​​the transverse hole 31 is the largest. When the elastic force of the compression spring 34 is greater than the gas pressure in the bellows 41, the piston 36 begins to move downward and enters the transverse hole 31, the effective flow area of ​​the transverse hole 31 decreases, thereby controlling the gas flow rate in the transverse hole 31.

[0052] When the bellows 41 extends, it drives the support part 5 to move downward along the slide groove 212. When the bellows 41 shortens, it drives the support part 5 to move upward along the slide groove 212. Multiple anti-rotation parts 54 connect the annular support ring 51 to the valve cover 211, preventing the annular support ring 51 from tilting during vertical movement, thereby avoiding torsion during the extension and contraction of the bellows 41. The U-shaped cross-section of the annular support ring 51 reduces its weight, and the added weight of the bellows 41 is minimal, which does not affect the sensitivity of sensing gas pressure changes. Multiple first support groups 52 and second support groups 53 inside the ring 51 increase the mechanical strength of the annular support ring 51 and enhance the support force on the bellows 41. The anti-rotation part 54, the annular support ring 51, the first support group 52 and the second support group 53 work together to increase the support force on the bellows 41 without affecting the sensitivity of the bellows 41 to sensing changes in gas pressure. At the same time, it can prevent the bellows 41 from twisting, avoiding damage due to twisting and loss of sealing, which would cause the oil-free bellows internal pressure pneumatic actuator to lose its function.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pneumatic actuator with internal pressure in an oil-free bellows, characterized in that, include: Valve body (1), which is installed in the gas pipeline to provide a passage for gas flow; The orifice (3) is located inside the valve body (1). The orifice (3) includes a piston (36) for adjusting the size of the channel of the valve body (1). Valve cover (2), which is located above the valve body (1) and is used to support and control the bellows section (4). Bellows section (4), which is located inside valve cover section (2), is used to drive piston (36) to move up and down; Support (5), there are several support (5), all of which are located outside the bellows section (4) and connected to the valve cover section (2) for supporting the bellows section (4) inside the valve cover section (2).

2. The oil-free bellows internal pressure pneumatic actuator according to claim 1, characterized in that, The valve body (1) includes a valve body (11), an air inlet (12), an air outlet (13), and an air guide pipe (14). The air inlet (12) is fixedly located on the left side of the valve body (11), the air outlet (13) is fixedly located on the right side of the valve body (11), and the bottom end of the air guide pipe (14) is connected to the air outlet (13).

3. The oil-free bellows internal pressure pneumatic actuator according to claim 2, characterized in that, The valve cover part (2) includes a valve cover assembly (21), a valve stem (22) and a handwheel (23). The valve cover assembly (21) includes a valve cover (211) and several sliding grooves (212). The valve cover (211) is fixedly installed on the top of the valve body (11). The sliding grooves (212) are all vertically installed on the inner wall of the valve cover (211). The valve stem (22) is installed through the valve cover (211) and is located on the valve cover (211). The handwheel (23) is fixedly installed on the top of the valve stem (22).

4. The oil-free bellows internal pressure pneumatic actuator according to claim 3, characterized in that, The receiving portion (3) further includes a channel assembly, a compression spring (34), and a fixing plate (35). The channel assembly includes a transverse hole (31), a limiting hole (32), and a stop hole (33). The transverse hole (31) is arranged transversely within the valve body (11). The limiting hole (32) is arranged vertically within the valve body (11) and located above the transverse hole (31). The stop hole (33) is arranged vertically within the valve body (11) and located above the transverse hole (31). Below, the stop hole (33) and the limit hole (32) are on the same straight line. The piston (36) is rotatably sleeved on the bottom end of the valve stem (22). The fixing plate (35) is fixedly sleeved on the bottom end of the valve stem (22) and located below the piston (36). The compression spring (34) is located inside the stop hole (33). The bottom end of the compression spring (34) is fixedly connected to the valve body (11), and the top end is rotatably connected to the fixing plate (35).

5. The oil-free bellows internal pressure pneumatic actuator according to claim 3, characterized in that, The bellows section (4) includes a bellows (41), a top plate (42) and a bottom plate (43). The top plate (42) is fixedly disposed at the top of the bellows (41) and at the bottom surface of the valve cover (211). The top plate (42) is connected to the valve stem (22). The bottom plate (43) is fixedly disposed at the bottom of the bellows (41) and is rotatably connected to the valve stem (22). The top of the air guide pipe (14) is connected to the bellows (41).

6. The oil-free bellows internal pressure pneumatic actuator according to claim 5, characterized in that, The support part (5) includes an annular support ring (51), several support components and several anti-rotation parts (54). The support components are all fixedly connected to the annular support ring (51). The support components include a first support group (52) and a second support group (53). The anti-rotation part (54) includes an anti-rotation rod (55), a connecting block (56) and a slider (57).

7. The oil-free bellows internal pressure pneumatic actuator according to claim 6, characterized in that, The first support group (52) includes a plurality of first support rods (521), and the second support group (53) includes a plurality of second support rods (531). The tails of the plurality of first support rods (521) are fixedly connected to form the first support group (52), and the ends of the plurality of second support rods (531) are fixedly connected to form the second support group (53). Both ends of the first support rods (521) and the second support rods (531) are fixedly connected to the annular support ring (51).

8. The oil-free bellows internal pressure pneumatic actuator according to claim 6, characterized in that, The annular support ring (51) is fixedly sleeved on the outer ring of the corrugated pipe (41). The anti-rotation rod (55) is fixedly connected to the annular support ring (51) through the connecting block (56). The anti-rotation rod (55) is slidably connected to the slide groove (212) through the slider (57).

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