Double-acting pneumatic actuator

Abstract

The utility model discloses a double-acting pneumatic actuator, which belongs to the technical field of pneumatic actuators, and comprises a shell sleeve, a driving component and a standby power component, the driving component is arranged in the shell sleeve, the standby power component is arranged at the top of the driving component, and the standby power component is used for driving the driving component. The standby power assembly comprises an inserting rod, a mounting rod, a connecting gear and an inner gear ring, two sliding blocks are fixedly connected to the bottom end of the inserting rod, the standby power assembly is connected to the upper portion of a driven gear in the driving assembly through a second connecting block, and when the air compressor stops working and cannot drive a piston, a nut can be unscrewed at the moment; when a manual mode is switched, a connecting gear moves downwards to be inserted into an inner gear ring to be matched with the inner gear ring, at the moment, a worm can be rotated to drive a fixing block to rotate through a mounting rod and the connecting gear, a driven gear can be rotated at the moment, and therefore driving can be conducted by switching the manual mode in the emergency state.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic actuator technical field, more specifically, relate to a double acting pneumatic actuator. BACKGROUND

[0002] Pneumatic actuator is a kind of compressed air as power source, the device for converting air pressure energy into mechanical movement, commonly used in automation control system drives valve, baffle, mechanical arm and other equipment, no electric spark, suitable for flammable and explosive environment (such as chemical industry, petroleum), action speed is high (can reach several times cycle per second), simple structure, maintenance is convenient, cost is lower than hydraulic or electric actuator.

[0003] Chinese patent authorized announcement No. CN220622922U provides pneumatic actuator, the scheme is knocked out from the convex slot by hammer and chisel to the damaged board, and new board is put into the convex slot, and the convex block is clamped in the convex slot by hammer and chisel, then two fixing plates are installed to the two sides of the board, so that two fixing plates can be firmly fixed on the two sides of the board, when part of the tooth surface wears, the rack cannot act, usually staff will directly replace rack, thereby increasing the economic cost technical problem.

[0004] Valve needs to install actuator to realize electric control, and pneumatic actuator is directly connected with valve stem to drive it, when air compressor stops working due to unexpected power failure, pneumatic actuator will lose power, at this time, if you want to close or open valve, pneumatic actuator needs to be disassembled, so that it is inconvenient to use in power failure and other emergency situations.

[0005] Therefore, a double acting pneumatic actuator is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] 1. Technical problem to be solved

[0007] The utility model provides a double acting pneumatic actuator, which can improve the problems in the related art: when air compressor stops working due to unexpected power failure, pneumatic actuator will lose power, at this time, if you want to close or open valve, pneumatic actuator needs to be disassembled, so that it is inconvenient to use in power failure and other emergency situations.

[0008] 2. Technical scheme

[0009] To solve the above problems, the utility model adopts the following technical scheme.

[0010] This application provides a double-acting pneumatic actuator, including: a housing, a drive assembly, and a backup power assembly. The drive assembly is disposed inside the housing, and the backup power assembly is disposed on top of the drive assembly and is used to drive the drive assembly. The backup power assembly includes a plug rod, a mounting rod, a connecting gear, and an internal gear ring. Two sliders are fixedly connected to the bottom end of the plug rod. The connecting gear is fixedly mounted on the bottom end of the plug rod through the sliders. The connecting gear is adapted to the internal gear ring. When the connecting gear moves downward to engage with the internal gear ring, the mounting rod drives the internal gear ring to rotate through the connecting gear.

[0011] The technical solutions described in this application embodiment have at least the following technical effects:

[0012] The backup power unit is connected above the driven gear in the drive assembly via connecting block two. When the air compressor stops working and cannot drive the piston, the nut can be loosened to allow the connecting gear to move downward and engage with the internal gear ring. Then, the worm can be rotated, causing it to drive the fixed block to rotate via the mounting rod and connecting gear. This allows the driven gear to rotate, thus enabling manual drive in emergency situations, improving reliability.

[0013] In some embodiments, a housing is fixedly installed on the top of the outer casing, the backup power assembly is disposed inside the housing, and end caps are fixedly installed on both ends of the outer casing.

[0014] In some embodiments, an external air port 1 and an external air port 2 are respectively opened at the outer end of the outer casing, and an internal air port 2 and two internal air ports 1 are respectively opened on the inner side of the outer casing. The external air port 1 is connected to the inside of the outer casing through the internal air port 2, and the external air port 2 is connected to the inside of the outer casing through the two internal air ports 1.

[0015] In some embodiments, the drive assembly includes two symmetrically arranged pistons and a driven gear. The pistons are slidably connected to the inner wall of the outer casing. A rack is fixedly installed at the outer end of each of the two pistons. The two racks are meshed with the driven gear. A connecting block one and a connecting block two are fixedly connected to both ends of the driven gear, respectively. The connecting block one extends through the side wall of the outer casing to the outside, and the top of the connecting block two extends through the side wall of the outer casing.

[0016] In some embodiments, the backup power assembly further includes a nut, the mounting rod is sleeved on the outer end of the insert rod, the insert rod extends through the top of the housing to the outside, and the top of the insert rod is fixed in position by being threaded to the nut.

[0017] In some embodiments, the outer end of the mounting rod has two symmetrically arranged sliding grooves, the slider passes through the sliding grooves, the connecting gear is sleeved on the outer surface of the mounting rod, and the connecting gear is slidably connected to the sliding grooves through the slider.

[0018] In some embodiments, the backup power assembly further includes a worm and a worm wheel. A fixing block is fixedly connected to the bottom end of the internal gear ring. The fixing block is fixedly connected to the connecting block. The bottom end of the mounting rod is rotatably connected to the top of the fixing block. The worm wheel is fixedly installed on the outer end of the mounting rod. One end of the worm is rotatably connected to the inner wall of the housing, and the other end of the worm extends through the housing to the outside. The worm is meshed with the worm wheel. A rotating rod is detachably connected to one end of the worm. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the outer casing of this utility model;

[0021] Figure 3 This is a schematic diagram of the air vent structure of the outer shell of this utility model;

[0022] Figure 4 This is a schematic diagram of the drive component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the backup power assembly structure of this utility model;

[0024] Figure 6 This is a cross-sectional view of the mounting rod of this utility model;

[0025] Figure 7 This is a schematic diagram of the connecting gear structure of this utility model.

[0026] Explanation of the labels in the diagram:

[0027] 1. Outer shell;

[0028] 2. End cap;

[0029] 3. Spare power assembly; 31. Worm gear; 32. Worm wheel; 33. Insert rod; 34. Nut; 35. Mounting rod; 36. Connecting gear; 37. Internal gear ring; 38. Fixing block; 39. Slide groove; 310. Slider;

[0030] 4. Shell;

[0031] 5. Rotating rod;

[0032] 6. One external air vent;

[0033] 7. Two external air vents;

[0034] 8. Drive assembly; 81. Rack; 82. Piston; 83. Connecting block one; 84. Driven gear; 85. Connecting block two;

[0035] 9. One internal air inlet;

[0036] 10. Inner air port two. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0038] Please see Figure 1 - Figure 7 A double-acting pneumatic actuator includes: a housing 1, a drive assembly 8, and a backup power assembly 3. The drive assembly 8 is disposed inside the housing 1, and the backup power assembly 3 is disposed on top of the drive assembly 8 and is used to drive the drive assembly 8. The backup power assembly 3 includes a plug rod 33, a mounting rod 35, a connecting gear 36, and an internal gear ring 37. Two sliders 310 are fixedly connected to the bottom end of the plug rod 33. The connecting gear 36 is fixedly mounted on the bottom end of the plug rod 33 through the sliders 310. The connecting gear 36 is adapted to the internal gear ring 37. When the connecting gear 36 moves downward and engages with the internal gear ring 37, the mounting rod 35 drives the internal gear ring 37 to rotate through the connecting gear 36.

[0039] The actuator in this design is primarily used to drive valves. Compared to traditional pneumatic actuators, the device in this application can switch to manual mode after the air compressor is lost, allowing it to still drive quickly in emergency situations. The outer casing 1 serves as the actuator's cylinder, and the drive assembly 8 is housed inside. The drive assembly 8 requires an external air compressor for operation, which uses compressed air. A backup power assembly 3, located above the outer casing 1, is connected to the drive assembly 8. The backup power assembly 3 is equipped with a clutch device, which disconnects power transmission when pneumatic drive is used.

[0040] The backup power assembly 3 is connected above the driven gear 84 in the drive assembly 8 via a connecting block 2 85. When the air compressor stops working and cannot drive the piston 82, the nut 34 can be loosened to allow the connecting gear 36 to move downward and engage with the internal gear ring 37. Then, the worm gear 31 can be rotated, causing it to drive the fixed block 38 to rotate via the mounting rod 35 and the connecting gear 36. This allows the driven gear 84 to rotate, thus enabling manual drive in emergency situations, improving reliability.

[0041] Please see Figure 1 - Figure 3 The outer casing 1 has a housing 4 fixedly installed on its top, and the spare power assembly 3 is located inside the housing 4. Both ends of the outer casing 1 are fixedly installed with end caps 2.

[0042] The outer end of the outer casing 1 is provided with an external air port 6 and an external air port 7. The inner side of the outer casing 1 is provided with an internal air port 10 and two internal air ports 9. The external air port 6 is connected to the inside of the outer casing 1 through the internal air port 10, and the external air port 7 is connected to the inside of the outer casing 1 through the two internal air ports 9.

[0043] In this design, the outer casing 1 has a housing 4 fixed on its top. The housing 4 is mainly used to install the backup power assembly 3 and protect the backup power assembly 3 inside from external interference. At both ends of the outer casing 1, end caps 2 are fixed with bolts. At the same time, sealing gaskets are also required during installation to improve the sealing performance. By sealing both ends of the outer casing 1 with the two end caps 2, a sealed cavity can be formed inside the outer casing 1.

[0044] External air inlet 6 and external air inlet 7 are respectively opened at the outer end of the outer casing 1, mainly for connecting with external air pipes. Internal air inlet 10 is opened near the middle inside the outer casing 1, while internal air inlet 9 is opened near both ends of the inner wall. External air inlet 6 and internal air inlet 10 are connected, so that external air inlet 6 can communicate with the inside of the outer casing 1 through internal air inlet 10. The two internal air inlets 9 and external air inlet 7 are connected, so that external air inlet 7 can also communicate with the outer casing 1. An air passage is opened on the inner side of the inner wall of the outer casing 1, so that external air inlet 7 and the two internal air inlets 9 can communicate.

[0045] Please see Figure 2 and Figure 4 The drive assembly 8 includes two symmetrically arranged pistons 82 and a driven gear 84. The pistons 82 are slidably connected to the inner wall of the outer casing 1. A rack 81 is fixedly installed on the outer end of each of the two pistons 82. The racks 81 are meshed with the driven gear 84. A connecting block 1 83 and a connecting block 2 85 are fixedly connected to both ends of the driven gear 84, respectively. The connecting block 1 83 extends through the side wall of the outer casing 1 to the outside, and the top of the connecting block 2 85 extends through the side wall of the outer casing 1.

[0046] The drive assembly 8 in this scheme has two drive modes: it can be pneumatically driven by an external air compressor in conjunction with external air ports 6 and 7, or it can be manually driven by the backup power assembly 3. The piston 82 is surrounded by a piston sleeve and sealing rings, etc. The piston 82 is slidably connected to the inner wall of the outer casing 1. The two pistons 82 are symmetrically arranged, and racks 81 are fixed to the sides of the two pistons 82 that are close to each other. The driven gear 84 is located in the middle of the outer casing 1, and the driven gear 84 meshes with both racks 81 simultaneously.

[0047] At both ends of the passive gear 84, connecting block 1 83 and connecting block 2 85 are fixed respectively. The bottom of connecting block 1 83 penetrates the side wall of the outer casing 1 and extends to the outside. A sealing ring and a gasket are required at the penetration point of connecting block 1 83 to ensure that the inside of the outer casing 1 remains sealed when it rotates. Connecting block 1 83 is the valve stem of the valve and needs to be connected with the corresponding kit so that it can be driven. Connecting block 2 85 also needs to penetrate the side wall of the outer casing 1 and extend to the outside, and it also needs to be sealed. Connecting block 2 85 is mainly used to connect the external drive source backup power assembly 3.

[0048] When the inner air port 10 takes in air through the outer air port 6, it pushes the piston 82 to both sides from the middle of the outer casing 1. At this time, the two racks 81 will mesh with the driven gear 84, which will drive the connecting block 83 on the driven gear 84 to drive the valve stem to rotate. At the same time, through the movement of the piston 82, the air at both ends of the outer casing 1 will be discharged through the inner air port 9 and the outer air port 7. When the outer air port 7 takes in air, its direction of movement will be reversed, and the air will be discharged through the outer air port 6, thus enabling it to achieve bidirectional action, allowing it to drive the valve to open and close, as well as regulate the flow rate.

[0049] Please see Figure 5 - Figure 7 The backup power assembly 3 also includes a nut 34, a mounting rod 35 sleeved on the outer end of the insertion rod 33, the insertion rod 33 extending through the top of the housing 4 to the outside, and the top of the insertion rod 33 is fixed in position by threaded connection with the nut 34.

[0050] Two symmetrically arranged sliding grooves 39 are provided at the outer end of the mounting rod 35. The slider 310 passes through the sliding grooves 39. The connecting gear 36 is sleeved on the outer surface of the mounting rod 35, and the connecting gear 36 is slidably connected to the sliding grooves 39 through the slider 310.

[0051] The backup power assembly 3 also includes a worm 31 and a worm wheel 32. A fixing block 38 is fixedly connected to the bottom end of the internal gear ring 37. The fixing block 38 is fixedly connected to the connecting block 85. The bottom end of the mounting rod 35 is rotatably connected to the top of the fixing block 38. The worm wheel 32 is fixedly installed on the outer end of the mounting rod 35. One end of the worm 31 is rotatably connected to the inner wall of the housing 4, and the other end of the worm 31 extends through the housing 4 to the outside. The worm 31 is meshed with the worm wheel 32. A rotating rod 5 is detachably connected to one end of the worm 31.

[0052] In this design, the backup power assembly 3 is located inside the housing 4. Since the top of the connecting block 2 85 protrudes, the fixing block 38 is fixed to the connecting block 2 85 and is fixedly connected to it. The internal gear ring 37 is fixed to the fixing block 38. The bottom of the mounting rod 35 is rotatably connected to the fixing block 38. The worm gear 32 is fixed at the outer end of the mounting rod 35. One end of the worm 31 is rotatably connected to the inner wall of the housing 4, while the other end extends through the side wall of the housing 4. The rotating rod 5 is detachably sleeved with the extended end of the worm 31, and the worm 31 can be rotated through the rotating rod 5.

[0053] A connecting gear 36 is sleeved on the outer end of the mounting rod 35. The interior of the mounting rod 35 is hollow, and the insert rod 33 is inserted into the interior of the mounting rod 35. The top of the insert rod 33 extends through the housing 4 to the outside. The top of the mounting rod 35 is rotatably connected to the top of the housing 4. Two sliding grooves 39 are opened on the outer end of the mounting rod 35. The connecting gear 36 is fixedly connected to the insert rod 33 through two sliders 310. The sliders 310 slide through the sliding grooves 39 and are slidably connected to them.

[0054] The portion of the insert rod 33 extending outward is threadedly connected to the nut 34, thus fixing the insert rod 33. The connecting gear 36 also moves away from the internal gear ring 37. When the nut 34 is removed, the insert rod 33 and the connecting gear 36 move downward, allowing the connecting gear 36 to engage with the internal gear ring 37. At this time, when the worm gear 31 is rotated, the worm wheel 32 is driven to rotate, and the worm wheel 32 drives the mounting rod 35. The connecting gear 36 is restricted by the slide groove 39 through the slider 310, allowing it to rotate with the mounting rod 35. The connecting gear 36 then drives the internal gear ring 37 and the fixed block 38 to rotate, thereby allowing the driven gear 84 to drive the connecting block 83 to rotate. By driving the backup power assembly 3, it can be switched to drive the backup power assembly 3 in an emergency, improving the reliability of operation.

[0055] It is worth mentioning that when using gas drive, the insert rod 33 needs to be lifted upwards and then the nut 34 needs to be installed to disengage the connecting gear 36 from the internal gear ring 37. Only then can gas drive be used to prevent damage to the worm gear 32 and worm 31.

[0056] Working principle: When gas is used for driving, air enters through the outer air port 6 and the inner air port 10, which pushes the piston 82 to both sides from the middle of the outer casing 1. At this time, the two racks 81 will mesh with the driven gear 84, which will drive the connecting block 83 on the driven gear 84 to drive the valve stem to rotate. The air at both ends of the outer casing 1 will be discharged through the inner air port 9 and the outer air port 7. When air enters through the outer air port 7, its direction of movement will be reversed, and the air will be discharged through the outer air port 6. When switching to manual mode, after removing the nut 34, the connecting gear 36 will move downward and fit into the inner gear ring 37. At this time, when the worm 31 is rotated, the worm wheel 32 can be driven to rotate. The connecting gear 36 is restricted by the slide groove 39 through the slider 310, so that it can rotate with the mounting rod 35. The rotation of the inner gear ring 37 and the fixing block 38 will drive the driven gear 84 to rotate the connecting block 83, which can switch to the backup power unit 3 for driving in an emergency.

Claims

1. A double-acting pneumatic actuator, characterized in that, include: Outer casing (1); The drive assembly (8) is disposed inside the outer casing (1); A backup power assembly (3) is disposed on the top of the drive assembly (8) and is used to drive the drive assembly (8). The backup power assembly (3) includes a plug rod (33), a mounting rod (35), a connecting gear (36), and an internal gear ring (37). Two sliders (310) are fixedly connected to the bottom end of the plug rod (33). The connecting gear (36) is fixedly mounted on the bottom end of the plug rod (33) through the sliders (310). The connecting gear (36) is adapted to the internal gear ring (37). When the connecting gear (36) moves downward and engages with the internal gear ring (37), the mounting rod (35) drives the internal gear ring (37) to rotate through the connecting gear (36).

2. The double-acting pneumatic actuator according to claim 1, characterized in that: The outer casing (1) is fixedly mounted with a housing (4) on top, and the backup power assembly (3) is disposed inside the housing (4). Both ends of the outer casing (1) are fixedly mounted with end caps (2).

3. A double-acting pneumatic actuator according to claim 2, characterized in that: The outer shell (1) has an external air port 1 (6) and an external air port 2 (7) at its outer end. The inner side of the outer shell (1) has an internal air port 2 (10) and two internal air ports 1 (9). The external air port 1 (6) is connected to the inside of the outer shell (1) through the internal air port 2 (10). The external air port 2 (7) is connected to the inside of the outer shell (1) through the two internal air ports 1 (9).

4. A double-acting pneumatic actuator according to claim 2, characterized in that: The drive assembly (8) includes two symmetrically arranged pistons (82) and a driven gear (84). The pistons (82) are slidably connected to the inner wall of the outer casing (1). A rack (81) is fixedly installed on the outer end of each of the two pistons (82). The racks (81) are meshed with the driven gear (84). A connecting block one (83) and a connecting block two (85) are fixedly connected to both ends of the driven gear (84). The connecting block one (83) extends through the side wall of the outer casing (1) to the outside. The top of the connecting block two (85) extends through the side wall of the outer casing (1).

5. A double-acting pneumatic actuator according to claim 4, characterized in that: The backup power assembly (3) also includes a nut (34), the mounting rod (35) is sleeved on the outer end of the insert rod (33), the insert rod (33) extends through the top of the housing (4) to the outside, and the top of the insert rod (33) is fixed in position by threaded connection with the nut (34).

6. A double-acting pneumatic actuator according to claim 5, characterized in that: The mounting rod (35) has two symmetrically arranged sliding grooves (39) at its outer end. The slider (310) passes through the sliding grooves (39). The connecting gear (36) is sleeved on the outer surface of the mounting rod (35) and is slidably connected to the sliding grooves (39) through the slider (310).

7. A double-acting pneumatic actuator according to claim 6, characterized in that: The backup power assembly (3) also includes a worm (31) and a worm wheel (32). The bottom end of the internal gear ring (37) is fixedly connected to a fixing block (38). The fixing block (38) is fixedly connected to the second connecting block (85). The bottom end of the mounting rod (35) is rotatably connected to the top of the fixing block (38). The worm wheel (32) is fixedly installed on the outer end of the mounting rod (35). One end of the worm (31) is rotatably connected to the inner wall of the housing (4), and the other end of the worm (31) extends through the housing (4) to the outside. The worm (31) is meshed with the worm wheel (32). One end of the worm (31) is detachably connected to a rotating rod (5).

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