CN206419533U - A kind of new single-action pneumatic executor - Google Patents

Abstract

The utility model discloses a novel single-acting pneumatic actuator, which comprises a cylinder, a box body, a spring cylinder, a piston, a piston rod and a spring seat. A return spring is sleeved on the left end of the spring seat. Chrome layer, the inner wall surface of the hard chrome layer of the cylinder is coated with a layer of Teflon coating; the right end of the spring cylinder is embedded with a plunger cylinder, and the right end of the plunger cylinder is integrally provided with a connecting flange, and the plunger cylinder passes through the connecting flange. It is detachably connected with the right end face of the spring cylinder. A plunger is arranged in the plunger cylinder. The axial centerline of the plunger coincides with the axial centerline of the piston rod. There is a storage cavity with an opening facing the right in the spring seat. The left end of the plunger cylinder is located in the storage cavity, and a spring cylinder piston ring is arranged between the spring seat and the inner wall of the spring cylinder. The above technical scheme has reasonable structure design, simple structure, small volume, good sealing performance, long service life and stable operation.

Description

A New Single-acting Pneumatic Actuator

technical field

The utility model relates to the technical field of pneumatic actuators, in particular to a novel single-acting pneumatic actuator.

Background technique

The pneumatic actuator is a control actuator for opening and closing the valve. Its structure generally includes a cylinder block, an execution box and a spring cylinder. The piston rod is connected with the inner chamber of the spring cylinder. When the piston and the actuator in the piston rod slide to make the shift fork and the output shaft in the actuator box rotate positively and negatively, the valve will open or close accordingly. There are still deficiencies in the existing pneumatic actuator structure: the existing pneumatic actuator structure is unreasonable, complex in structure, and large in size. Convenience, unstable work.

Contents of the invention

Aiming at the deficiencies of the existing technology, the purpose of this utility model is to provide a new single-acting pneumatic actuator with reasonable structure design, simple structure, small volume, good sealing performance, long service life and stable operation.

In order to achieve the above object, the utility model provides the following technical solutions: a new single-acting pneumatic actuator, including a cylinder, a box, a spring cylinder, a piston, a piston rod and a spring seat, the piston is installed in the cylinder, and the spring seat Installed in the spring cylinder, the left end of the piston rod is connected to the piston, and the right end of the piston rod passes through the box to connect with the spring seat. The left end of the spring seat is sleeved with a return spring. , the inner wall surface of the hard chromium layer of the cylinder is coated with a layer of Teflon coating; the right end of the spring cylinder is embedded with a plunger cylinder, and the right end of the plunger cylinder is integrally provided with a connecting flange, the plunger cylinder The connecting flange is detachably connected to the right end face of the spring cylinder, a plunger is arranged in the plunger cylinder, the axial centerline of the plunger coincides with the axial centerline of the piston rod, and the spring seat is arranged There is a storage cavity opening to the right, the left end of the plunger cylinder is located in the storage cavity, and a spring cylinder piston ring is arranged between the spring seat and the inner wall of the spring cylinder.

By adopting the above technical scheme, the hard chromium layer of the cylinder can improve the hardness, wear resistance, temperature resistance and corrosion resistance of the inner wall of the cylinder; the Teflon coating has the dual advantages of wear resistance and non-adhesion, and has a good lubricating effect , so that the inner wall of the cylinder is not easy to wear, has a long service life, good sealing, easy to use, and stable work; the plunger cylinder is embedded in the spring cylinder, which makes reasonable use of space and does not increase the size. The structure is reasonable in design and simple in structure. Small size and good practicability.

The utility model is further set as follows: the left end of the cylinder is provided with a left end cap, the right end of the cylinder is provided with a right end cap, a first sealing ring is arranged between the left end cap and the inner wall of the cylinder, and a sealing ring is arranged between the right end cap and the inner wall of the cylinder. A second sealing ring is provided, a first tie rod and a second tie rod are arranged between the left end cover and the right end cover, and at least one tie rod nut is arranged on the left and right ends of the first tie rod and the second tie rod, and the first tie rod and the second pull rod all lock the left end cover, the cylinder and the right end cover by rotating the pull rod nut. With this setting, the cylinder structure is reasonable, the connection is reliable, and the sealing performance is good.

The utility model is further configured as follows: the working surface of the piston is provided with a first annular groove and a second annular groove sequentially from left to right, a third sealing ring is sleeved in the first annular groove, A cylinder piston ring is sleeved in the second annular groove, and the piston forms a seal between the third sealing ring and the cylinder piston ring and the Teflon coating. Through this setting, the piston structure is set reasonably, the sealing performance is good, and the work is stable.

The utility model is further set as: the middle part of the right end cover is provided with a piston rod through hole for the piston rod to move, and the inner wall surface of the piston rod through hole is sequentially provided with a third annular groove and a third annular groove from left to right. A fourth annular groove, a fourth sealing ring is arranged in the third annular groove, and a wear-resistant ring is arranged in the fourth annular groove. Through this setting, the structure of the right end cover is reasonably set, and the sealing performance of the joint with the piston rod is better after the fourth sealing ring is set.

The utility model is further set as: the middle part of the piston is provided with a piston rod connecting hole, the inner wall surface of the piston rod connecting hole is provided with a fifth annular groove, and the fifth annular groove is provided with a first Five sealing rings. Through this setting, the piston structure is set reasonably, and the sealing performance of the joint with the piston rod is better after the fifth sealing ring is set.

The utility model is further set as: the middle part of the right end face of the spring cylinder is axially provided with a plunger cylinder installation hole, the plunger cylinder is embedded in the plunger cylinder installation hole, and the connection method of the plunger cylinder The right end of the flange is provided with a gland, and the gland is provided with several connecting studs, and the left end of each connecting stud passes through the connecting flange and is threadedly connected with the screw hole on the right end surface of the spring cylinder. Through this arrangement, the plunger cylinder is conveniently connected and fixed reliably.

The utility model is further set as: the left end of the piston rod is provided with a left connecting part, the right end of the piston rod is provided with a right connecting part, the diameters of the left connecting part and the right connecting part are both smaller than the diameter of the middle section of the piston rod, and the left Both the connecting part and the outer ends of the right connecting part are provided with external threads, the piston is connected with the left connecting part, the spring seat is connected with the right connecting part, and two lock nuts are arranged at the left and right ends of the piston rod. Through this setting, the structure of the piston rod is reasonably set, the connection between the piston rod and the piston and the spring seat is convenient, and the fixing is reliable.

The utility model is further configured as: the surface of the piston rod is plated with a hard chrome layer of the piston rod. With this arrangement, the hard chrome layer of the piston rod can improve the hardness, wear resistance, temperature resistance and corrosion resistance of the piston rod.

The utility model is further configured as follows: the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring are all O-shaped sealing rings. With this configuration, the sealing ring has a simple structure, low manufacturing cost and good sealing performance.

The utility model is further configured as: the axial centerlines of the piston rod through hole and the piston rod connecting hole coincide with each other. Through this setting, the structural setting is more reasonable, and the piston rod works reliably.

The utility model has the advantages that: compared with the prior art, the structure setting of the utility model is more reasonable, and the hard chromium layer of the cylinder can improve the hardness, wear resistance, temperature resistance and corrosion resistance of the inner wall of the cylinder; The layer has the dual advantages of wear resistance and non-adhesion, and the lubricating effect is good, so that the inner wall of the cylinder is not easy to wear, has a long service life, good sealing, easy to use, and stable work; the plunger cylinder is embedded in the spring cylinder, Reasonable use of space, no increase in size, reasonable structure design, simple structure, small size, and good practicability.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments of the description.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the enlarged schematic diagram of part I in Fig. 1;

FIG. 3 is an enlarged schematic view of part II in FIG. 1 .

detailed description

Referring to Fig. 1, Fig. 2 and Fig. 3, a novel single-acting pneumatic actuator disclosed by the utility model includes a cylinder 1, a box body 2, a spring cylinder 3, a piston 4, a piston rod 5 and a spring seat 6, and the piston 4 is installed in the cylinder 1, the spring seat 6 is installed in the spring cylinder 3, the left end of the piston rod 5 is connected with the piston 4, the right end of the piston rod 5 passes through the box body 2 and is connected with the spring seat 6, and the left end of the spring seat 6 is sleeved with Back-moving spring 7, the inner wall surface of described cylinder 1 is coated with one deck cylinder hard chromium layer 8, and the inner wall surface of described cylinder hard chrome layer 8 is coated with one deck Teflon coating 9; The right end of described spring cylinder 3 is embedded The plunger cylinder 10 is provided with a plunger cylinder 10, the right end of the plunger cylinder 10 is integrally provided with a connecting flange 11, the plunger cylinder 10 is detachably connected with the right end surface of the spring cylinder 3 through the connecting flange 11, and the inside of the plunger cylinder 10 A plunger 12 is provided, the axial centerline of the plunger 12 coincides with the axial centerline of the piston rod 5, and a storage cavity 61 with an opening to the right is arranged in the spring seat 6, and the plunger cylinder The left end of 10 is located in the storage cavity 61 , and a spring cylinder piston ring 13 is arranged between the spring seat 6 and the inner wall surface of the spring cylinder 3 .

As preferably, the right end surface of the cylinder 1 and the left end surface of the box body 2 are connected and fixed by existing studs or bolts; the right end surface of the box body 2 and the left end surface of the spring cylinder 3 are connected by existing studs or bolts The connection is fixed; the left end of the return spring 7 presses against the left inner wall of the inner chamber of the spring cylinder 3 .

In order to make the structure of the present utility model more reasonable, as preferred, the left end of the cylinder 1 described in this embodiment is provided with a left end cover 14, the right end of the cylinder 1 is provided with a right end cover 15, and the left end cover 14 and the inner wall surface of the cylinder 1 are provided with There is a first sealing ring 16, a second sealing ring 17 is arranged between the right end cover 15 and the inner wall of the cylinder 1, and a first pull rod 18 and a second pull rod 19 are arranged between the left end cover 14 and the right end cover 15, so The left and right ends of the first pull rod 18 and the second pull rod 19 are provided with at least one pull rod nut 20, and the first pull rod 18 and the second pull rod 19 lock the left end cover 14, the cylinder 1 and the right end cover 15 by rotating the pull rod nut 20 .

A first annular groove 41 and a second annular groove 42 are sequentially arranged on the working surface of the piston 4 from left to right, the first annular groove 41 is sleeved with a third sealing ring 21 , and the first annular groove 41 is sleeved with a third sealing ring 21 . The cylinder piston ring 22 is sleeved in the two annular grooves 42 , and the piston 4 forms a seal between the third sealing ring 21 and the cylinder piston ring 22 and the Teflon coating 9 .

The middle part of the right end cover 15 is provided with a piston rod through hole 151 for the piston rod to move, and the inner wall surface of the piston rod through hole 151 is provided with a third annular groove 152 and a fourth annular groove from left to right. groove

153 , the fourth sealing ring 23 is arranged in the third annular groove 152 , and the wear-resistant ring 24 is arranged in the fourth annular groove 153 .

The middle part of the piston 4 is provided with a piston rod connecting hole 43, and the inner wall surface of the piston rod connecting hole 43 is provided with a fifth annular groove 44, and a fifth sealing ring is arranged in the fifth annular groove 44. 25.

The middle part of the right end face of the spring cylinder 3 is axially provided with a plunger cylinder installation hole 31, the plunger cylinder 10 is embedded in the plunger cylinder installation hole 31, and the right end of the connecting flange 11 of the plunger cylinder 10 A gland 26 is provided, and the gland 26 is provided with several connecting studs 27 , and the left end of each connecting stud 27 passes through the connecting flange 11 and is threadedly connected with the screw hole on the right end surface of the spring cylinder 3 .

The left end of the piston rod 5 is provided with a left connecting portion 51, and the right end of the piston rod 5 is provided with a right connecting portion 51. The diameters of the left connecting portion 51 and the right connecting portion 52 are smaller than the diameter of the middle section of the piston rod, and the left connecting portion 51 and the outer ends of the right connecting portion 52 are provided with external threads, the piston 4 is connected with the left connecting portion 51, the spring seat 6 is connected with the right connecting portion 52, and the left and right ends of the piston rod 5 are provided with two A lock nut 28.

The surface of the piston rod 5 is plated with a hard chromium layer of the piston rod.

The first sealing ring 16 , the second sealing ring 17 , the third sealing ring 21 , the fourth sealing ring 23 and the fifth sealing ring 25 are all O-rings.

The axial centerlines of the piston rod through hole 151 and the piston rod connecting hole 43 coincide with each other.

In actual application, the hard chromium layer of the cylinder can improve the hardness, wear resistance, temperature resistance and corrosion resistance of the inner wall of the cylinder; the Teflon coating has the dual advantages of wear resistance and non-adhesion, and has a good lubricating effect, making The inner wall surface of the cylinder is not easy to wear, has a long service life, good sealing performance, convenient use and stable operation; the plunger cylinder is embedded in the spring cylinder, which makes reasonable use of space and does not increase the size. The structure design is reasonable, the structure is simple, and the volume is small , Good practicality.

In addition, it can be further improved on the basis of the embodiments of the present invention:

(1) Increase the pre-installed spring device of the pneumatic actuator, pre-install the spring in the spring device, eliminate the accidental release of the elastic force, eliminate the potential danger, prevent misoperation, and facilitate disassembly and installation;

(2) Pneumatic actuators are integrated to optimize the position of the center of gravity and reduce the installation space;

(3) Pneumatic actuators are equipped with functional modules such as pneumatic power, hydraulic power, spring power, and manual control. All modules can be interchanged and combined and replaced with each other;

(4) O-rings are provided at the joints of each component, which can effectively prevent moisture from entering the interior of the housing, withstand short-term or long-term immersion, and meet IP66 and IP67 protection standards;

(5) The sliding friction parts of the piston and piston rod are equipped with self-lubricating bearings, the surface of the piston rod is electroplated with hard chrome and finely ground and polished, and the inner wall of the cylinder is coated with Teflon coating or electroplated with hard chrome and polished. Lubrication performance, so that the output energy can be directly transmitted to the valve as much as possible;

(6) Pneumatic actuator piston ring, using PTFE, carbon fiber and other materials for pneumatic special fluorocarbon guide ring, which isolates the cylinder and piston movement, avoids scratches, and has good lubrication and wear resistance. Extended service life;

(7) The self-lubricating bearing of the drive shaft of the pneumatic actuator is used, which has the function of lubrication and guiding, which reduces the friction force and increases the transmission performance, so that the output energy can be directly transmitted to the valve as much as possible;

(8) Pneumatic actuator shift fork roller sleeve structure, the upper and lower roller sleeves made of bearing steel clamp the shift fork, the roller sleeve slides back and forth in the groove, and converts the straight stroke into angular stroke output;

(9) The interface dimensions of the top drive shafts of all models of pneumatic actuators are all the same, which conforms to the NANUM standard, and is convenient for the standard installation method of position switches, positioners and other accessories;

(10) Pneumatic actuator and valve installation, flange and shaft key connection, the size is in line with the torque range specified by the ISO5211 standard.

The specific description of the utility model in the foregoing embodiments is only used to further illustrate the utility model, and cannot be interpreted as limiting the protection scope of the utility model. Technical engineers in the field make some non-essential modifications to the utility model according to the content of the utility model Improvements and adjustments all fall within the protection scope of the present utility model.

Claims (10)

1. a kind of new single-action pneumatic executor, including cylinder (1), casing (2), spring cylinder (3), piston (4), piston rod (5) and spring base (6), the piston (4) is arranged in cylinder (1), and spring base (6) is arranged in spring cylinder (3), piston rod (5) left end is connected with piston (4), and piston rod (5) right-hand member is connected through casing (2) with spring base (6), and the spring base (6) is left End is socketed with back-moving spring (7), it is characterised in that：One layer of cylinder hard chromium layers (8), institute are coated with the internal face of the cylinder (1) One layer of teflon coatings (9) is coated with the internal face for stating cylinder hard chromium layers (8)；Spring cylinder (3) right-hand member is embedded to be set There is plunger case (10), plunger case (10) right-hand member has been wholely set adpting flange (11), and plunger case (10) passes through adpting flange (11) right side with spring cylinder (3) is detachably connected, and plunger (12), the plunger (12) are provided with the plunger case (10) Longitudinal center line overlapped with the longitudinal center line of piston rod (5), an opening is provided with the spring base (6) and being put towards right Thing cavity (61), the left end of the plunger case (10) is located in the glove cavity (61), the spring base (6) and spring cylinder (3) spring cylinder piston ring (13) is provided between internal face.

2. a kind of new single-action pneumatic executor according to claim 1, it is characterised in that：A left side for the cylinder (1) End is provided with left end cap (14), and the right-hand member of cylinder (1) is provided with right end cap (15), the internal face of left end cap (14) and cylinder (1) Between be provided with the first sealing ring (16), be provided with the second sealing ring (17) between right end cap (15) and the internal face of cylinder (1), The first pull bar (18) and the second pull bar (19), first pull bar are provided between the left end cap (14) and right end cap (15) (18) and the second pull bar (19) left and right ends at least provided with a pull-rod nut (20), the first pull bar (18) and second is drawn Bar (19) locks left end cap (14), cylinder (1) and right end cap (15) by rotating rod nut (20).

3. a kind of new single-action pneumatic executor according to claim 2, it is characterised in that：The work of the piston (4) Make to be disposed with first annular groove (41) and the second annular groove (42) on face from left to right, the first annular groove (41) it is socketed with the 3rd sealing ring (21), second annular groove (42) and is socketed with cylinder piston ring (22), the work (4) are filled in seal by constituting between the 3rd sealing ring (21) and cylinder piston ring (22) and teflon coatings (9).

4. a kind of new single-action pneumatic executor according to claim 3, it is characterised in that：The right end cap (15) Middle part is provided with a piston rod through-hole (151) for piston rod activity, the internal face of the piston rod through-hole (151) from a left side It is disposed with the 3rd annular groove (152) and fourth annular groove (153), the 3rd annular groove (152) and sets to the right side It is equipped with the 4th sealing ring (23), fourth annular groove (153) and is provided with wear ring (24).

5. a kind of new single-action pneumatic executor according to claim 4, it is characterised in that：In the piston (4) Portion is provided with annular on piston lever attachment hole (43), the internal face of the piston lever attachment hole (43) and is provided with the 5th annular groove (44), it is provided with the 5th sealing ring (25) in the 5th annular groove (44).

6. a kind of new single-action pneumatic executor according to claim 1, it is characterised in that：The spring cylinder (3) Axially arranged in the middle part of right side to have a plunger case mounting hole (31), plunger case (10) installation by adhering is installed in plunger case In hole (31), and plunger case (10) adpting flange (11) right-hand member be provided with gland (26), the gland (26) if on be provided with Dry root connecting stud (27), the left end of every connecting stud (27) passes through the right side of adpting flange (11) afterwards with spring cylinder (3) On screw threaded connection.

7. a kind of new single-action pneumatic executor according to claim 1, it is characterised in that：The piston rod (5) is left End is provided with left connecting portion (51), and piston rod (5) right-hand member is provided with right connecting portion (51), the left connecting portion (51) and right connection The diameter in portion (52) is respectively less than the diameter of piston rod interlude, and the outer end of left connecting portion (51) and right connecting portion (52) is respectively provided with There is external screw thread, the piston (4) is connected with left connecting portion (51), and the spring base (6) is connected with right connecting portion (52), and piston The left and right ends of bar (5) are provided with two locking nuts (28).

8. a kind of new single-action pneumatic executor according to claim 1, it is characterised in that：The piston rod (5) Piston rod hard chromium layers are coated with surface.

9. a kind of new single-action pneumatic executor according to claim 5, it is characterised in that：First sealing ring (16), the second sealing ring (17), the 3rd sealing ring (21), the 4th sealing ring (23) and the 5th sealing ring (25) are the sealing of O shapes Circle.

10. a kind of new single-action pneumatic executor according to claim 6, it is characterised in that：The piston rod through-hole (151) mutually coincided with the longitudinal center line of piston lever attachment hole (43).