TW201712256A - Piston structure of pneumatic cylinder for effectively enhancing sealing effect and structural strength with low manufacturing cost and easy assembly - Google Patents

Abstract

The invention provides a piston structure of pneumatic cylinder, which comprises a pneumatic cylinder; an acting rod having one end penetrated through the pneumatic cylinder and assembled with a valve seat; and, a piston having the inner wall and the outer wall respectively formed with an inner ring surface and an outer ring surface. In which, the interior of the piston is coated with a metallic reinforcing member as a whole. The piston is fitted on the acting rod. The inner and outer ring surfaces of the piston are respectively pressed against the outer wall surface of the acting rod and the inner wall surface of the pneumatic cylinder. With the aforementioned components, when the piston is pressed, the piston of softer material may be suitably deformed to achieve better sealing effect, and the reinforcing member of harder material inside the piston may be used for supporting, so as to effectively enhance the sealing effect and the structural strength. The invention may have low manufacturing cost, is easy to be assembled, and provide excellent sealing effect and durability, so as to achieve excellent novel practicability and cost benefit.

Description

Piston structure of pressure cylinder

The invention relates to a piston structure of a pressure cylinder, in particular to a piston integrally coated with a metal material, which can effectively improve the sealing effect and structural strength, and has the advantages of low manufacturing cost, easy assembly, good sealing performance and durability. By.

Pressing, the pressure cylinder is provided with a piston structure, the outer diameter of which is approximately equal to the inner diameter of the pressure cylinder, and the inner portion of the pressure cylinder is divided into two chambers, and the two chambers can be divided into a pneumatic type and a hydraulic pressure by structural application. In combination with a gas-oil pressure type, the piston can slide in the pressure cylinder to change the volume enclosed by the pressure cylinder or to transmit the pressure exerted by the gas or oil body in the pressure cylinder. The pneumatic or hydraulic type refers to the use of the characteristics of the gas or the oil body to make the piston rod with the force to generate the damping value; the gas-oil pressure composite type uses the gas compressible characteristic to match the circulation of the hydraulic oil, and The piston rod that receives the force produces a damping value.

Generally, the piston system has a hollow ring shape, and a shaft hole is arranged in the center thereof. A piston rod is threaded through the shaft hole and coupled with the piston assembly. The piston is driven by the piston rod and is displaced relative to the pressure cylinder to provide transmission pressure. The effect is that the gap between the piston rod and an oil chamber is blocked by the piston to prevent gas or oil from leaking out. The piston is an elastic material that can be appropriately modified. However, due to the displacement of the piston rod, the piston shaft is prone to deformation due to yaw deformation, which causes air leakage or oil leakage. The ring surface is provided with a ring groove, and a supplemental piece is arranged in the ring groove to improve the anti-compression stress against the piston itself when resisting the eccentricity of the shaft, thereby preventing leakage or oil leakage caused by the eccentricity of the shaft center. The problem has occurred.

Commonly used as a piston structure with a filling member, the filling member can be further divided into an elastic material and a metal material depending on the application of the material.

According to the piston structure of the elastic material filling member, the "oil seal structure improvement" disclosed in the new patent No. 090223848 is provided at the open end of the annular groove of the bottom surface of the oil seal body. The inner and outer sides of the open end of the open end jointly form a lip seal point including at least three points, thereby generating a stable three-point support positioning effect with the axial center and the opposite inner wall surface thereof, thereby effectively preventing the oil seal The body is subjected to oil pressure and pressure to produce a lack of tilting eccentric oil leakage; and a filling member of elastic material is filled in the annular groove of the oil seal body to improve the anti-compression stress of the oil seal itself when resisting the axial deflection. The oil leakage caused by the yaw of the shaft itself can be prevented from occurring; and a plurality of gaps for the oil film returning are disposed on the inner and outer sides of the opening end of the annular groove of the oil seal body, so that the oil seal body can be The oil film attached to the capillary pores on the surface of the shaft core is recovered by backflow through the notch; by the improvement of the structure, the oil seal can be prevented from being eccentrically inclined after the oil seal is applied, thereby causing oil leakage. , While providing axial reciprocating actuator capable of adhering process in the axial surface of the capillary film is recovered, the oil pressure can be improved own axis due to the lack of oil leakage caused by the yawing motion of the displacement.

A piston structure having a metal filler member, such as a gas pressure leakage preventing ring of a gas pressure bar disclosed in the Japanese Patent No. 087219017 The anti-leakage ring is assembled in an outer cylinder tube of one of the air pressure rods. The outer cylinder tube is internally provided with a coaxial inner cylinder tube, an inner air chamber is formed inside the inner cylinder tube, and a inner air chamber is formed between the inner and outer cylinder tubes. An axially displaceable gas chamber is disposed on the inner and outer cylinder tubes, and an axially displaceable piston rod is assembled on the inner and outer cylinder tubes, wherein the piston rod is assembled on a shaft end of the inner air chamber to assemble a piston; and the gas filling is leakproof The ring has a base that is moderately deformed, and a metal gasket embedded on the base, wherein the base has a ring base, and the base has a shaft hole for the piston rod to penetrate, and the shaft hole The peripheral edge protrudes from the inner ring wall of the ring, wherein a ring protruding from the inner ring wall can tighten the tightening portion of the piston rod, and a ring inclined portion of the inner air chamber gradually converging, wherein the outer ring wall protrudes The two rings can be closely attached to the inner wall surface of the outer cylinder tube to prevent leaking flanges, so that when the gas is filled, only the air inlet slope can be introduced into the inner air chamber.

The inner and outer sides of the open end of the annular groove of the former oil seal body have protrusions formed on the inner and outer sides to form a lip seal point including at least three points, thereby generating an inner wall surface corresponding to the shaft center and the opposite The utility model has the advantages of stable three-point support positioning, and can effectively prevent the oil seal body from being affected by the oil pressure and the lack of the inclined eccentric oil leakage, and the filler of the elastic material is filled in the ring groove of the oil seal body to enhance the resistance. The anti-compression stress of the axial yaw on the oil pressure prevents the oil leakage caused by the yaw of the shaft itself, and several pieces are provided on the inner and outer sides of the opening end of the ring groove of the oil seal body. The gap of the hydraulic oil film is recirculated, so that the oil seal body can recover the oil film attached to the surface of the shaft through the gap; the latter gas leakage preventing ring has an outer ring which is matched with the cylinder tube outside the gas pressure rod. Wall, and one can tighten The inner ring wall of the piston rod of the pressure rod protrudes from the outer ring wall to abut against the leakage preventing flange of the inner wall surface of the outer cylinder tube, and protrudes from the inner ring wall to tighten the tightening portion of the piston rod to the bundle The tight portion is a boundary formed on the inner ring wall to form a closed inclined surface facing the inner side of the gas pressure bar, and an air intake inclined surface facing the outer side of the gas pressure bar. When the gas pressure bar is in the right gas, the gas can enter the gas pressure bar through the air intake inclined surface. After the completion of the gas filling, the internal air pressure can act on the closed slope, and the tightening portion tightly holds the piston rod tightly.

However, the filling material of the former elastic material has limited support effect, and is easily deformed by the reciprocating displacement to affect the sealing effect; the latter leakage preventing ring is provided with a groove-embedded metal gasket, but the leakage preventing ring is in contact with both sides of the groove. The area is reduced and cannot withstand high pressure, and after displacement by the piston rod, the metal gasket easily escapes from the groove and loses the sealing effect, so that the gas or oil body between the two chambers enters the other chamber through the gap, resulting in a two-chamber chamber. The gas or oil body between the two produces pollution, which affects the operation of the pressure cylinder, and the overall structure does need to be improved.

The piston structure of the pressure cylinder disclosed in the present invention comprises: a pressure cylinder; an actuating rod, one end of which is disposed in the pressure cylinder and is provided with a valve seat; a piston having a hollow cylindrical shape and having a shaft hole, The piston is a plastic material. The inner and outer walls of the piston are respectively formed with an inner annular surface and an outer annular surface. The inner part of the piston is integrally covered with an annular one-piece reinforcing member, and the reinforcing member is a metal material application. The shaft hole is sleeved on the actuating rod, and the inner and outer annular surfaces of the piston are respectively abutted against the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder; and the above member is formed by the setting of the reinforcing member of the hard material Piston, when pressed, the piston of the softer material can be deformed moderately and more tightly, and the reinforcement is provided by the harder material inside the piston to provide support. Effectively improve the sealing effect and structural strength, its manufacturing cost is low, assembly is easy, sealing is good and durable, to achieve excellent innovation and cost-effectiveness.

The piston structure of the pressure cylinder provided by the invention is made of a plastic material coated with a metal material reinforcement member, and the piston is integrally formed. When the pressure is applied, the piston of the soft material can be moderately deformed and more sealed, and borrowed. The inside of the piston has a stiffer material to provide support, which effectively improves the sealing effect and structural strength, and has low manufacturing cost, easy assembly, good sealing performance and durability, so as to achieve excellent innovation and cost-effectiveness; Each of the inner and outer annular faces of the piston is formed with an annular flange. When the piston is compressed and deformed, each of the flanges forms a ring-shaped single point contact with the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder. Providing a single point sealing effect, and improving the smoothness of sliding of the piston; the inner and outer annular surfaces of the piston may respectively be provided with a plurality of ring grooves, each of which forms a ring shape on each of the inner and outer ring faces The plurality of flanges, when the piston is deformed by pressure, the plurality of flanges of the inner and outer annular surfaces form an annular multi-point contact with the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder, thereby providing a multi-point sealing effect. Lift the piston The smoothness of the movement and the improvement of the sealing property; the inner and outer annular faces of the piston are respectively provided with ring grooves, and the ring grooves are respectively arranged on the axial end faces of the pistons, and the ring grooves are respectively at the inner ring end faces The annular portion is formed with two flanges, and each of the annular grooves is formed with an annular two-flange at the end of the outer annular surface to improve the smoothness of the sliding of the piston. When the piston is pressed, it can have a larger Flexible deformation, and by the arrangement of the reinforcement, provides the effect of an excellent flexible seal.

10‧‧‧pressure cylinder

20‧‧‧Action rod

21‧‧‧ valve seat

30‧‧‧Piston

31‧‧‧ shaft hole

32‧‧‧ Inner torus

321‧‧‧Flange

322‧‧‧ Ring groove

323‧‧‧Flange

33‧‧‧ outer annulus

331‧‧‧Flange

332‧‧‧ Ring groove

333‧‧‧Flange

34‧‧‧First room

35‧‧‧Second room

36‧‧‧ third room

40‧‧‧Reinforcement

50‧‧‧Piston

51‧‧‧Axis hole

52‧‧‧ Inner torus

521‧‧‧ Ring groove

53‧‧‧ outer annulus

531‧‧‧ Ring groove

54‧‧‧ Ring groove

55‧‧‧Flange

56‧‧‧Flange

The first figure is a partial cross-sectional view of a three-dimensional appearance of a preferred embodiment of the present invention.

The second figure is an exploded perspective view of a preferred embodiment of the present invention.

The third figure is a combined cross-sectional view of a preferred embodiment of the present invention.

The fourth figure is a partial cross-sectional view of the stereoscopic appearance of the second embodiment of the creation.

The fifth figure is an exploded perspective view of the second embodiment of the creation.

The sixth drawing is a combined sectional view of the second embodiment of the creation.

Figure 7 is a partial cross-sectional view showing the three-dimensional appearance of the third embodiment of the present invention.

The eighth figure is an exploded perspective view of the third embodiment of the creation.

The ninth drawing is a sectional view of the combination of the third embodiment of the creation.

Figure 11 is a partial cross-sectional view showing the three-dimensional appearance of the fourth embodiment of the present invention.

The eleventh drawing is an exploded perspective view of the fourth embodiment of the creation.

Fig. 12 is a sectional view showing the combination of the fourth embodiment of the creation.

The thirteenth drawing is a schematic view showing the deformation of the piston of the fourth embodiment of the present invention.

First, referring to the first to third figures, the piston structure of the pressure cylinder provided by the present invention comprises: a pressure cylinder 10, an actuating rod 20, and a piston 30.

The actuating rod 20 has one end that is disposed in the pressure cylinder 10 and is provided with a valve seat 21 .

The piston 30 has a hollow cylindrical shape and has a shaft hole 31. The piston 30 is a plastic material which can be appropriately deformed. The inner and outer walls of the piston 30 are respectively formed with an inner annular surface 32 and an outer annular surface 33. The inner part is integrally covered with an annular one-piece reinforcing member 40, and the reinforcing member 40 is applied to a metal material; the piston 30 is sleeved on the actuating rod 20 by the shaft hole 31, and the inner and outer annular surfaces 32 of the piston 30 are And the 33 is respectively abutted against the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, and the first chamber 34 and the second chamber 35 are separated from the inner portion of the cylinder 10 by the piston 30, and the piston 30 can be The pressure cylinder 10 slides, and each of the first and second chambers 34, 35 can accommodate a gas, an oil body or an elastomer, or can respectively contain a gas and an oil body to form a gas-oil pressure composite capacity. a chamber, or a composite chamber formed by a gas or an oil body and an elastomer; and a third chamber 36 formed between the valve seat 21 and the pressure cylinder 10, wherein the third chamber 36 can be Contains gas, oil or elastomer.

With the above-mentioned members, the piston 30 is integrally covered with a metal-reinforced member 40, and the piston 30 is formed by the arrangement of the stiffener 40. When pressed, the piston 30 of the softer material can be appropriately deformed. More sealed, The reinforcing member 40 of the hard material is provided inside the piston 30 to provide support, thereby effectively improving the sealing effect and structural strength, and has low manufacturing cost, easy assembly, good sealing performance and durability, so as to achieve excellent innovation and cost. Benefits.

For a further understanding of the structural features of the present invention, the use of technical means, and the desired effects achieved, the manner in which the present invention is assembled and used is described as follows:

In the assembly of the present invention, the reinforcing member 40 is covered with a plastic material and the piston 30 is integrally formed, and then the shaft hole 31 of the piston 30 and the actuating rod 20 are sleeved with each other, and then the actuating rod 20 and the piston 30 are further The inner and outer annular surfaces 32 and 33 of the piston 30 are respectively abutted against the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, that is, the assembly is completed.

In the manner of use of the present invention, when the actuating lever 20 is displaced, the piston 30 can slide in the pressure cylinder 10 to change the volume surrounded by the first and second chambers 34, 35, or to transmit the first, The gas in the second chambers 34, 35 or the pressure exerted by the body.

Referring to Figures 4-6, a second embodiment of the present invention, wherein the inner and outer annular faces 32, 33 of the piston 30 can be arcuate, and the inner and outer annular faces 32, 33 One of the annular flanges 321 and 331 is formed, and each of the flanges 321 and 331 forms an annular single-point contact with the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, and when the piston 30 is deformed by pressure, The effect of a single point seal is provided, and the smoothness of sliding of the piston 30 can be improved.

Referring to the seventh embodiment, the third embodiment of the present invention, wherein the inner and outer annular faces 32, 33 of the piston 30 are respectively provided with at least one ring groove. 322, 332, in the embodiment, each of the inner and outer annular surfaces 32, 33 is respectively provided with a plurality of annular grooves 322, 332, and each of the annular grooves 322, 332 is formed on each of the inner and outer annular faces 32, 33. The plurality of flanges 323 and 333 having a ring shape, and the plurality of flanges 323 and 333 of the inner and outer annular surfaces 32 and 33 respectively abut against the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, when the piston 30 is pressed During the deformation, the plurality of flanges 323 and 333 of the inner and outer annular surfaces 32 and 33 form an annular multi-point contact with the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, thereby providing a multi-point sealing effect. The frictional force between the outer wall surface of the actuating lever 20 and the inner wall surface of the pressure cylinder 10 is dispersed to improve the smoothness of sliding of the piston 30, and the sealing property can be improved.

Referring to the tenth to thirteenth drawings, in the fourth embodiment of the present invention, the piston 50 is also hollow cylindrical and has a shaft hole 51. The inner and outer walls of the piston 50 are respectively formed with an inner annular surface 52 and an outer portion. The annular surface 53 is also integrally covered with an annular reinforcing member 40. The inner and outer annular surfaces 52 and 53 of the piston 50 are respectively provided with a ring groove 521, 531, and the piston 50 shaft A ring groove 54 is formed in each of the two end faces, and each of the ring grooves 521 and 54 is formed with an annular flange 55 at an end of the inner ring surface 52, and each of the ring grooves 531 and 54 is formed at an end of the outer ring surface 53. The annular flanges 56 are arranged such that the inner and outer annular surfaces 52 and 53 are respectively provided with annular flanges 55 and 56 abutting against the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10, The smoothness of sliding of the piston 50 is improved, and when the piston 50 is pressed, it can have a large flexural deformation, and by virtue of the arrangement of the reinforcing member 40, it provides an excellent function of a flexible seal.

The invention utilizes a plastic material to cover the metal material reinforcement member 40, and integrally forms the piston 30. When the pressure is applied, the piston 30 of the soft material can be moderately deformed and more sealed, and the piston 30 has a relatively internal inside. The reinforcing member 40 of the hard material provides support, effectively improves the sealing effect and structural strength, and has low manufacturing cost, easy assembly, good sealing performance and durability, so as to achieve excellent innovation, practicability and cost effectiveness; Each of the inner and outer annular faces 32, 33 is formed with annular flanges 321 and 331. When the piston 30 is deformed by pressure, the flanges 321 and 331 and the outer wall surface of the actuating lever 20 and the inner wall surface of the cylinder 10 are pressed. A single point contact is formed between the rings to provide a single point sealing effect, and the smoothness of sliding of the piston 30 can be improved.

The inner and outer annular faces 32, 33 of the piston 30 can be respectively provided with a plurality of annular grooves 322, 332, and each of the annular grooves 322, 332 is formed with a plurality of annular flanges 323 at the inner and outer annular faces 32, 33. 333, when the piston 30 is deformed by compression, the plurality of flanges 323, 333 of the inner and outer annular surfaces 32, 33 and the outer wall surface of the actuating rod 20 and the inner wall surface of the pressure cylinder 10 respectively form a circular multi-point contact The utility model provides the effect of multi-point sealing, improves the smoothness of the sliding of the piston 30, and improves the sealing property.

The inner and outer annular surfaces 52 and 53 of the piston 50 are respectively provided with ring grooves 521 and 531, and annular grooves 54 are respectively formed on the axial end faces of the piston 50, and the ring grooves 521 and 54 are respectively formed on the inner ring surface. The end portion of the 52 is formed with a ring-shaped two flanges 55. Each of the ring grooves 531 and 54 is formed with an annular flange 56 at the end of the outer ring surface 53 to improve the smoothness of sliding of the piston 50. 50 When pressed, it can have a large flexural deformation, and by virtue of the arrangement of the reinforcing member 40, it provides an excellent effect of the flexible seal.

In summary, the "piston structure of the pressure cylinder" disclosed in the present invention provides a piston 30 coated with a metal material reinforcement member 40. When pressed, the piston 30 of the soft material can be moderately deformed and more sealed. The reinforcing member 40 of the hard material is provided inside the piston 30 to provide support, thereby effectively improving the sealing effect and structural strength, and has low manufacturing cost, easy assembly, good sealing performance and durability, and is highly practical and has a high practicality. The cost-effective piston structure makes the whole industry practical and innovative, and its structure has not been seen in the publications or public use. It is in line with the requirements of the invention patent application, so please ask the bureau to grant the patent as soon as possible. prayer.

It is to be understood that the above is a specific embodiment of the present invention and the technical principles applied thereto, and the functional effects produced by the concept of the present invention are still beyond the spirit of the specification and drawings. In the meantime, it should be combined with Chen Ming within the scope of the present invention.

10‧‧‧pressure cylinder

20‧‧‧Action rod

21‧‧‧ valve seat

30‧‧‧Piston

32‧‧‧ Inner torus

33‧‧‧ outer annulus

34‧‧‧First room

35‧‧‧Second room

36‧‧‧ third room

40‧‧‧Reinforcement

Claims (4)

A piston structure of a pressure cylinder comprises: a pressure cylinder; an actuating rod, one end of which is disposed in the pressure cylinder and is provided with a valve seat; a piston is hollow cylindrical and has a shaft hole, and the piston is plastic In the application of the material, the inner and outer walls of the piston are respectively formed with an inner annular surface and an outer annular surface, and the inner part of the piston is integrally covered with an annular one-piece reinforcing member, and the reinforcing member is a metal material application, and the piston is used for the shaft hole. The sleeve is disposed on the actuating rod, and the inner and outer annular surfaces of the piston abut against the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder. The piston structure of the pressure cylinder according to the first aspect of the invention, wherein the inner and outer annular surfaces of the piston are arcuate, and one of the annular flanges is formed on each of the inner and outer annular surfaces, and each of the flanges The flange is between the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder. According to the piston structure of the pressure cylinder of claim 1, wherein the inner and outer annular surfaces of the piston are respectively provided with at least one annular groove, and each of the annular grooves is formed with a ring-shaped plural in each of the inner and outer annular faces. The flanges, the plurality of flanges of the inner and outer annular surfaces respectively abut against the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder. According to the piston structure of the pressure cylinder of claim 1, wherein the inner and outer annular surfaces of the piston are respectively provided with a ring groove, and a ring groove is respectively arranged on the axial end faces of the piston, and each ring groove is provided. An annular two-shaped flange is formed at an end of the inner annular surface, and each annular groove is formed with an annular two-flange at an end of the outer annular surface, so that each of the inner and outer annular surfaces is respectively provided with a ring-shaped second The flange abuts against the outer wall surface of the actuating rod and the inner wall surface of the pressure cylinder.