CN111594510A - Integral type bellows bearing seal cylinder - Google Patents

Abstract

The invention provides an integrated bellows shaft seal cylinder, which comprises a cylinder barrel, a cylinder top cover, a cylinder lower cover, a piston, a bellows piston rod, a pressing block and a vent hole, wherein the cylinder top cover and the cylinder lower cover are respectively installed at openings at two ends of the cylinder barrel, the piston is arranged in the cylinder barrel and is in close contact with the inner wall of the cylinder barrel, the bellows piston rod is arranged at the joint of the cylinder barrel and the cylinder lower cover, one end of the bellows piston rod is connected with the cylinder lower cover, the other end of the bellows piston rod is connected with the piston, the pressing block is arranged at the position, close to the bellows piston rod, of the cylinder barrel, one end of the pressing block is connected with the inner wall of the cylinder barrel, the other. The invention solves the problem that a novel air cylinder with a dynamic sealing structure, which has high air tightness, low leakage rate, simple installation, good interchangeability, compact structure, lower cost and good dynamic sealing performance, is lacked at present.

Description

An integrated bellows shaft seal cylinder

technical field

The invention relates to the technical field of bellows and cylinders, and more particularly to an integrated bellows shaft seal cylinder.

Background technique

The dynamic sealing structure between the cylinder piston rod and the air tightness device usually adopts two sealing forms. The first is the dynamic sealing structure formed by the cooperation of the piston rod and the sealing ring (referred to as the sealing ring shaft seal), and the second is the bellows Dynamic sealing structure.

The first dynamic sealing structure adopts the combination of the sealing ring and the piston rod to form a compression amount to realize the sealing. The structure is simple and the installation is convenient. However, the sealing ring will be rubbed during the movement of the cylinder piston rod, so the dynamic sealing performance is poor and the leakage rate is poor. High, the service life is lower than the service life of the bellows dynamic seal structure, suitable for low air tightness devices.

The second type of shaft seal structure adopts the combined installation of the cylinder and the bellows to form a dynamic seal structure. The bellows is compressible and can follow the expansion and contraction of the piston rod to achieve a frictionless shaft seal structure at the dynamic seal, with high air tightness and leak rate. Low, the service life is higher than the service life of the first type of dynamic sealing structure of the sealing ring, suitable for devices with high air tightness requirements, the bellows shaft seal needs to be customized by customers such as bellows, installation sleeves and other components to increase the installation of equipment Complexity, less interchangeability and versatility, and higher cost.

At present, the cylinders are produced separately. Due to the large size and weight, the use of cylinders is limited in some occasions. Moreover, most of the cylinders do not have an air buffer structure, and the cylinder with an air buffer structure is also a three-stage type. The cylinder part, the buffer part, and the bellows part have a large number of parts and high manufacturing costs.

SUMMARY OF THE INVENTION

The invention provides an integrated bellows shaft seal cylinder to solve the current lack of a new type of high air tightness, low leakage rate, simple installation, good interchangeability, compact structure, low cost and good dynamic sealing performance. The problem of the cylinder of the dynamic sealing structure.

In order to solve the above technical problems, the technical scheme adopted in the present invention is: an integrated bellows shaft seal cylinder, comprising a cylinder barrel, a cylinder top cover, a cylinder lower cover, a piston, a bellows piston rod, a pressing block and a vent hole , the cylinder top cover and the cylinder lower cover are respectively installed at the openings at both ends of the cylinder barrel, the piston is arranged in the cylinder barrel, the piston is in close contact with the inner wall of the cylinder barrel, the The bellows piston rod is provided at the connection between the cylinder barrel and the cylinder lower cover, one end of the bellows piston rod is connected with the cylinder lower cover, and the other end is connected with the piston, and the cylinder barrel is close to the The bellows piston rod is provided with the pressing block, one end of the pressing block is connected with the inner wall of the cylinder barrel, and the other end is connected with the bellows piston rod, the surface of the cylinder barrel is provided with the vent hole, The ventilation holes include upper ventilation holes and lower ventilation holes.

Further, the bellows piston rod further includes a main piston rod and a bellows, the bellows is sleeved into the main piston rod, and the bellows is connected to the main piston rod by welding.

Further, a bellows welding disk is provided at one end of the main rod of the piston away from the sealing gland, the bellows is located between the piston and the bellows, and one end of the bellows is welded to the bellows welding disk. , the other end is welded and connected with the sealing gland, and the middle section between the two ends is in close contact with the piston main rod, that is, the bellows and the piston main rod form an integral dynamic seal of the bellows shaft seal structure.

Further, the bellows piston rod includes a sealing gland, and both the cylinder lower cover and the pressing block are connected with the sealing gland.

Further, a first sealing ring is provided at the contact between the sealing gland and the inner wall of the cylinder barrel.

Further, the diameter of the bellows is smaller than the diameter of the sealing gland.

Further, the piston includes a restrictor plate, a through hole is arranged in the middle of the restrictor plate, the through hole is matched with the bellows piston rod, and the bellows piston rod passes through the through hole and the restrictor plate connection.

Further, a retaining ring is provided on the side of the restrictor plate close to the lower cylinder cover, and the retaining ring is tightly fitted on the bellows piston rod.

Further, the upper air hole and the lower air hole are respectively located on both sides of the piston.

Further, the cylinder barrel is provided with a buffer air hole, and the buffer air hole is used for buffering when the cylinder is pushed out in place.

Further, a gasket is provided at the connection between the cylinder top cover and the cylinder barrel.

Preferably, an installation groove is provided on the side of the piston close to the cylinder top cover, the installation groove is an annular groove, the installation groove and the through hole are arranged concentrically, and the installation groove is provided with a threaded hole, so The threaded holes are provided with matching bolts, there are four threaded holes, and the four threaded holes are distributed in a cross. The side of the piston main rod close to the cylinder top cover is provided with a cross groove, and the cross groove A matching cross plate is provided, the cross plate is provided with installation holes, there are four installation holes, and the four installation holes are respectively located in the four directions of the front, rear, left and right of the cross plate. The threaded holes are matched, the main piston rod passes through the through holes and contacts with the installation grooves, the cross plate is inserted into the cross grooves, the bolts pass through the installation holes and are threadedly connected to the threaded holes, so The cross slot is provided with fixing holes, there are five fixing holes, and the five fixing holes are respectively located at the center position of the cross slot and four directions of front, rear, left, right, and right, and the fixing holes are provided with matching screws, The cross plate is provided with screw holes that match the fixing holes, and there are five screw holes. The screw penetrates the screw hole and is threadedly connected to the fixing hole.

Preferably, a second sealing ring is provided at the contact between the piston main rod and the installation groove.

Compared with the prior art, the present invention has the following beneficial effects: the integrated bellows shaft seal cylinder of the present invention is provided with a cylinder barrel, a cylinder top cover, a cylinder lower cover, a piston, a bellows piston rod, a pressing block and a vent hole. In the present invention, the cylinder piston and the bellows are designed as one piece, and the dynamic seal at the shaft seal of the cylinder piston rod adopts the bellows seal, and the sealing performance is better than that of the dynamic sealing structure of the rubber ring, which can better improve the sealing performance of the connected device and reduce the Shaft seal leakage rate at the connection of the small connection device to the cylinder. Compared with the combined installation structure of the cylinder and the bellows, the structure is more compact, the appearance is more beautiful, the installation is simple, the versatility and interchangeability are better, and the manufacturing cost is reduced. The bellows piston rod drives the air tightness device of the cylinder to be installed to achieve axial reciprocation along with the intake and exhaust of the vent hole. While ensuring the function of the traditional cylinder, the bellows is used to carry out the axial dynamic sealing design to improve the air tightness. The sealing performance of the airtight device simplifies the complexity of the combined installation of the high airtight device and the sealing bellows, increases the interchangeability of the assembly of the bellows and the airtight device, reduces the manufacturing cost and improves the assembly efficiency.

Technology: Improve the dynamic sealing performance, the dynamic sealing structure of the airtight device is integrated with the cylinder, the structure is compact and the appearance is exquisite. Good economic benefits: the interchangeability of the bellows and the airtight device is increased, the manufacturing cost is reduced, the equipment installation is simplified, and the assembly efficiency is improved. Strong versatility: For equipment that needs to be installed with bellows to improve the air tightness of the device, the installation and interchangeability can be realized, and the exchange is easy. It only needs to be equipped with an adapter plate connected with the cylinder and the air tight device, and there is no need to design the bellows sleeve, The sleeve adapter plate, bellows welding and other components improve the general interchangeability of the dynamic sealing and driving parts of the device. The cylinder of the invention has a one-section shape, which is smaller in shape, lighter in weight and better in appearance, has only one section, and is more economical and feasible for profile processing and has better sealing performance.

Description of drawings

FIG. 1 is a schematic structural diagram of an integrated bellows shaft seal cylinder according to the present invention.

FIG. 2 is a schematic diagram of the connection structure of the piston main rod and the installation groove of an integrated bellows shaft seal cylinder according to the present invention.

FIG. 3 is a schematic structural diagram of Embodiment 3 of the present invention.

4 is a schematic diagram of the connection structure of the No. 1 piston main rod and the No. 1 installation groove in the third embodiment of the present invention.

5 is a schematic diagram of the connection structure of the No. 2 piston main rod and the No. 2 installation groove in the third embodiment of the present invention.

Reference numerals: 1 is the top cover of the cylinder, 2 is the gasket, 3 is the cylinder barrel, 4 is the restrictor plate, 5 is the retaining ring, 6 is the bellows, 7 is the pressing block, 8 is the first sealing ring, 9 10 is the lower cover of the cylinder, 10 is the sealing gland, 11 is the bellows piston rod, 12 is the piston, 13 is the second sealing ring, 14 is the cross plate, 15 is the installation groove, 16 is the bellows welding plate, 17 is the piston main Rod, 18 is a screw, 19 is a bolt, 20 is a cross groove, 21 is a threaded hole, 22 is a fixing hole, 23 is a screw hole, 24 is a mounting hole, 25 is the No. 2 bellows piston rod, and 26 is the No. 2 sealing pressure. Cover, 27 is the lower cover of the No. 2 cylinder, 28 is the No. 2 first sealing ring, 29 is the No. 2 compression block, 30 is the No. 2 bellows, 31 is the No. 2 retaining ring, 32 is the No. 2 restrictor plate, 33 It is the No. 2 cylinder barrel, 34 is the No. 2 gasket, 35 is the No. 1 gasket, 36 is the No. 1 cylinder barrel, 37 is the No. 1 restrictor, 38 is the No. 1 retaining ring, 39 is the No. 1 bellows, 40 No. 1 compression block, 41 is No. 1 first sealing ring, 42 is No. 1 cylinder lower cover, 43 is No. 1 sealing gland, 44 is No. 1 bellows piston rod, 45 is No. 2 piston main rod, 46 It is the No. 2 bellows welding plate, 47 is the No. 2 piston, 48 is the No. 2 second sealing ring, 49 is the No. 2 cross plate, 50 is the No. 2 installation groove, 51 is the No. 2 cylinder top cover, and 52 is the No. 2 pass Holes, 53 is the No. 1 cylinder top cover, 54 is the No. 1 through hole, 55 is the No. 1 piston, 56 is the No. 1 second sealing ring, 57 is the No. 1 cross plate, 58 is the No. 1 installation groove, and 59 is the No. 1 Bellows welding plate, 60 is No. 1 piston main rod, 61 is No. 1 screw, 62 is No. 1 bolt, 63 is No. 1 cross groove, 64 is No. 1 threaded hole, 65 is No. 1 fixing hole, 66 is No. 1 Mounting holes, 67 is the No. 1 screw hole, 68 is the No. 2 screw, 69 is the No. 2 bolt, 70 is the No. 2 cross slot, 71 is the No. 2 threaded hole, 72 is the No. 2 fixing hole, 73 is the No. 2 mounting hole, 74 is the No. 2 screw hole.

Detailed ways

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention will be further described below with reference to the embodiments, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other used embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 5 . The structures shown in the figures are selected embodiments of the present invention, which are for illustrative purposes only, and are not limited by such structures in the patent application.

Example 1

As shown in Figure 1, an integrated bellows shaft seal cylinder includes a cylinder barrel 3, a cylinder top cover 1, a cylinder lower cover 9, a piston 12, a bellows piston rod 11, a pressing block 7 and a vent hole. The cylinder top cover 1 and the cylinder lower cover 9 are respectively installed at the openings at both ends of the cylinder barrel 3 , the cylinder barrel 3 is provided with the piston 12 , and the piston 12 is closely connected to the inner wall of the cylinder barrel 3 . Contact, the bellows piston rod 11 is provided at the connection between the cylinder barrel 3 and the cylinder lower cover 9, one end of the bellows piston rod 11 is connected with the cylinder lower cover 9, and the other end is connected with the piston 12 is connected, the cylinder barrel 3 is provided with the pressing block 7 near the bellows piston rod 11, one end of the pressing block 7 is connected with the inner wall of the cylinder barrel 3, and the other end is connected with the bellows piston The rod 11 is connected, and the surface of the cylinder barrel 3 is provided with the ventilation hole, and the ventilation hole includes an upper ventilation hole and a lower ventilation hole.

In this embodiment, the bellows piston rod 11 includes a sealing gland 10 , and the lower cylinder cover 9 and the pressing block 7 are both connected to the sealing gland 10 . A first sealing ring 8 is provided at the contact between the sealing gland 10 and the inner wall of the cylinder barrel 3 . The bellows piston rod 11 further includes a main piston rod 17 and a bellows 6 , the bellows 6 is sleeved into the main piston rod 17 , and the bellows 6 is connected to the main piston rod 17 by welding.

Further, a bellows welding disc 16 is provided at one end of the piston main rod 17 away from the sealing gland 10, the bellows 6 is located between the piston 12 and the The bellows welding plate 16 is welded and connected, the other end is welded to the sealing gland 10, and the middle section between the two ends is in close contact with the piston main rod 17, that is, the bellows 6 and the piston main rod 17 A dynamic seal structure that forms an integrated bellows shaft seal. The diameter of the bellows 6 is smaller than the diameter of the sealing gland 10 .

Preferably, the piston 12 includes a restrictor plate 4, and a through hole is provided in the middle of the restrictor plate 4, and the through hole is matched with the bellows piston rod 11, and the bellows piston rod 11 penetrates through it. The through hole is connected with the restrictor plate 4 . A retaining ring 5 is provided on the side of the restrictor plate 4 close to the lower cylinder cover 9 , and the retaining ring 5 is fitted around the bellows piston rod 11 .

More preferably, the upper air hole and the lower air hole are located on both sides of the piston 12 respectively.

Further, the cylinder barrel 3 is provided with a buffer air hole, and the buffer air hole is used for buffering when the cylinder is pushed out in place.

Preferably, a gasket 2 is provided at the connection between the cylinder top cover 1 and the cylinder barrel 3 .

Embodiment 2

As shown in FIG. 1 and FIG. 2 , a mounting groove 15 is provided on the side of the piston 12 close to the cylinder top cover 1 , the mounting groove 15 is an annular groove, and the mounting groove 15 is arranged concentrically with the through hole, The mounting groove 15 is provided with threaded holes 21, the threaded holes 21 are provided with matching bolts 19, there are four threaded holes 21, and the four threaded holes 21 are distributed in a cross. A cross groove 20 is opened on the side close to the cylinder top cover 1, the cross groove 20 is provided with a matching cross plate 14, the cross plate 14 is provided with installation holes 24, and the installation holes 24 have four, four The installation holes 24 are respectively located in the four directions of the cross plate 14 , the installation holes 24 are matched with the threaded holes 21 , and the piston main rod 17 penetrates the through holes and the installation grooves. 15 contact, the cross plate 14 is inserted into the cross slot 20, the bolt 19 penetrates the mounting hole 24 and is threadedly connected to the threaded hole 21, the cross slot 20 is provided with a fixing hole 22, the fixing hole 22 There are 5, and the 5 fixing holes 22 are respectively located at the center position of the cross slot 20 and the four directions of front, rear, left, right, and right. The fixing holes 22 are provided with matching screws 18, and the cross plate 14 is provided with matching screws. There are five screw holes 23 matching the fixing holes 22, and the five screw holes 23 are located at the center position of the cross plate 14 and the four directions of front, rear, left, right, and right, and the screws 18 pass through. The screw holes 23 are threadedly connected with the fixing holes 22 .

Preferably, a second sealing ring 13 is provided where the piston main rod 17 contacts the mounting groove 15 . The integrated bellows shaft seal cylinder of the present invention is suitable for an air pressure environment where the air pressure source is less than 0.7MPa.

Embodiment 3

As shown in FIGS. 3 , 4 and 5 , the cylinder bore 3 includes a No. 1 cylinder bore 36 and a No. 2 cylinder bore 33 , and the cylinder head 1 includes a No. 1 cylinder head 53 and a No. 2 cylinder head 51 , the cylinder lower cover 9 includes a No. 1 cylinder lower cover 42 and a No. 2 cylinder lower cover 27, the piston 12 includes a No. 1 piston 55 and a No. 2 piston 47, and the bellows piston rod 11 includes a No. 1 bellows piston Rod 44 and No. 2 bellows piston rod 25, described pressing block 7 includes No. 1 pressing block 40 and No. 2 pressing block 29, and the upper vent hole includes No. 1 upper vent hole and No. 2 upper vent hole, The lower vent hole includes a No. 1 vent hole and a No. 2 vent hole, the sealing gland 10 includes a No. 1 sealing gland 43 and a No. 2 sealing gland 26, and the first sealing ring 8 includes a No. The first sealing ring 41 and the second first sealing ring 28, the piston main rod 17 includes the first piston main rod 60 and the second piston main rod 45, the bellows 6 includes the first bellows 39 and the second bellows 30. The bellows welding plate 16 includes the No. 1 bellows welding plate 59 and the No. 2 bellows welding plate 46. The restrictor plate 4 includes the No. 1 restrictor plate 37 and the No. 2 restrictor plate 32. The ring 5 includes a No. 1 retaining ring 38 and a No. 2 retaining ring 31, the gasket 2 includes a No. 1 gasket 35 and a No. 2 gasket 34, and the installation groove 15 includes a No. 1 installation groove 58 and a No. 2 installation groove 50 , the threaded hole 21 includes a No. 1 threaded hole 64 and a No. 2 threaded hole 71, the cross groove 20 includes a No. 1 cross groove 63 and a No. 2 cross groove 70, and the cross plate 14 includes a No. 1 cross plate 57 and two No. 4 cross plate 49, the mounting holes 24 include No. 1 mounting holes 66 and No. 2 mounting holes 73, the fixing holes 22 include No. 1 fixing holes 65 and No. 2 fixing holes 72, and the screws 18 include No. 1 screws 61 and No. 2 screw 68, the screw hole 23 includes a No. 1 screw hole 67 and a No. 2 screw hole 74, the bolt 19 includes a No. 1 bolt 62 and a No. 2 bolt 69, and the second sealing ring 13 includes a No. The second sealing ring 56 and the second sealing ring 48, the through holes include a first through hole and a second through hole.

As shown in FIG. 3 , the No. 1 cylinder top cover 53 and the No. 1 cylinder lower cover 42 are respectively installed at the openings at both ends of the No. 1 cylinder barrel 36 , and the No. 1 cylinder barrel 36 is provided with the No. 1 piston 55, the No. 1 piston 55 is in close contact with the inner wall of the No. 1 cylinder barrel 36, and the No. 1 corrugation is provided at the connection between the No. 1 cylinder barrel 36 and the No. 1 cylinder lower cover 42 Pipe piston rod 44, one end of the No. 1 bellows piston rod 44 is connected to the No. 1 cylinder lower cover 42, and the other end is connected to the No. 1 piston 55, and the No. 1 cylinder barrel 36 is close to the No. 1 corrugation The pipe piston rod 44 is provided with the No. 1 pressing block 40, one end of the No. 1 pressing block 40 is connected with the inner wall of the No. 1 cylinder barrel 36, and the other end is connected with the No. 1 bellows piston rod 44, The surface of the No. 1 cylinder barrel 36 is provided with the No. 1 upper vent hole and the No. 1 lower vent hole.

As shown in FIG. 3 , the No. 2 cylinder top cover 51 and the No. 2 cylinder lower cover 27 are respectively installed at the openings at both ends of the No. 2 cylinder barrel 33 , and the No. 2 cylinder barrel 33 is provided with the The No. 2 piston 47, the No. 2 piston 47 is in close contact with the inner wall of the No. 2 cylinder barrel 33, and the No. 2 corrugation is provided at the connection between the No. 2 cylinder barrel 33 and the No. 2 cylinder lower cover 27 Pipe piston rod 25, one end of the No. 2 bellows piston rod 25 is connected with the lower cover 27 of the No. 2 cylinder, and the other end is connected with the No. 2 piston 47, and the No. 2 cylinder barrel 33 is close to the No. 2 bellows The pipe piston rod 25 is provided with the No. 2 pressing block 29, one end of the No. 2 pressing block 29 is connected with the inner wall of the No. 2 cylinder barrel 33, and the other end is connected with the No. 2 bellows piston rod 25, The surface of the No. 2 cylinder barrel 33 is provided with the No. 2 upper vent hole and the No. 2 lower vent hole.

As shown in FIG. 3 , the No. 1 cylinder top cover 53 is fixedly connected to the No. 2 cylinder top cover 51 , the No. 1 cylinder top cover 53 is provided with a No. 1 through hole 54 , and the No. 2 cylinder top cover 51 The No. 2 through hole 52 is provided, the No. 1 through hole 54 is matched with the No. 2 through hole 52, and the No. 1 through hole 54 is communicated with the No. 2 through hole 52, that is, a multi-directional linkage cylinder structure is formed. , while having all the advantages of the integrated bellows shaft seal cylinder, it can output force in multiple directions, and the structure is simple to install, only need to separate the top cover 53 of the No. 1 cylinder and the top cover 51 of the No. 2 cylinder respectively The hole is opened, and then the No. 1 cylinder top cover 53 and the No. 2 cylinder top cover 51 can be fixedly connected.

Further, the No. 1 bellows piston rod 44 includes the No. 1 sealing gland 43 , and the No. 1 cylinder lower cover 42 and the No. 1 pressing block 40 are both connected to the No. 1 sealing gland 43 . . The No. 1 first sealing ring 41 is provided where the No. 1 sealing gland 43 contacts the inner wall of the No. 1 cylinder barrel 36 . The No. 1 bellows piston rod 44 further includes the No. 1 piston main rod 60 and the No. 1 bellows 39, the No. 1 bellows 39 is sleeved into the No. 1 piston main rod 60, and the No. 1 bellows The No. 1 bellows 39 is connected to the No. 1 piston main rod 60 by welding. One end of the No. 1 piston main rod 60 away from the No. 1 sealing gland 43 is provided with the No. 1 bellows welding plate 59 , and the No. 1 bellows 39 is located at the No. 1 piston 55 and the No. 1 seal Between the glands 43, one end of the No. 1 bellows 39 is welded to the No. 1 bellows welding plate 59, the other end is welded to the No. 1 sealing gland 43, and the middle section between the two ends is connected to the The No. 1 piston main rod 60 is in close contact. The diameter of the No. 1 bellows 39 is smaller than the diameter of the No. 1 sealing gland 43 .

In this solution, the No. 1 piston 55 includes the No. 1 restrictor plate 37 , the No. 1 flow restrictor 37 is provided with the No. 1 through hole, the No. 1 through hole and the No. 1 corrugation The pipe piston rod 44 is matched, and the No. 1 bellows piston rod 44 is connected to the No. 1 restrictor plate 37 through the No. 1 through hole. The No. 1 restrictor 37 is provided with the No. 1 retaining ring 38 on the side of the No. 1 cylinder lower cover 42 , and the No. 1 retaining ring 38 is tightly fitted to the No. 1 bellows piston rod 44 . The No. 1 upper vent hole and the No. 1 lower vent hole are located on both sides of the No. 1 piston 55 respectively. The No. 1 gasket 35 is provided at the connection between the No. 1 cylinder top cover 53 and the No. 1 cylinder barrel 36 . The No. 1 second sealing ring 56 is provided where the No. 1 piston main rod 60 contacts the No. 1 installation groove 58 .

Preferably, as shown in FIG. 4 , the No. 1 piston 55 is provided with the No. 1 installation groove 58 on the side close to the No. 1 cylinder top cover 53 , and the No. 1 installation groove 58 is an annular groove. The No. 1 installation groove 58 is concentrically disposed with the No. 1 through hole, the No. 1 installation groove 58 is provided with the No. 1 threaded hole 64 , and the No. 1 threaded hole 64 is provided with the matching No. 1 bolt 62 There are four No. 1 threaded holes 64, and the four No. 1 threaded holes 64 are distributed in a cross. The No. 1 piston main rod 60 is provided with the No. 1 No. 1 cylinder top cover 53 on the side Cross slot 63, the No. 1 cross slot 63 is provided with the matching No. 1 cross plate 57, the No. 1 cross plate 57 is provided with a No. 1 mounting hole 66, and the No. 1 mounting hole 66 has four, four The No. 1 mounting holes 66 are respectively located in the front, rear, left and right directions of the No. 1 cross plate 57 . The No. 1 mounting holes 66 are matched with the No. 1 threaded holes 64 . The No. 1 piston main rod 60 The No. 1 through-hole penetrating through the No. 1 through hole is in contact with the No. 1 installation slot 58 , the No. 1 cross plate 57 is inserted into the No. 1 cross slot 63 , and the No. 1 bolt 62 penetrates through the No. 1 installation hole 66 and is connected to the No. 1 cross slot 63 . The No. 1 threaded hole 64 is threadedly connected, the No. 1 cross groove 63 is provided with the No. 1 fixing hole 65, there are five No. 1 fixing holes 65, and the five No. 1 fixing holes 65 are respectively located in the No. 1 fixing hole 65 The center position of the No. 1 cross slot 63 and the four directions of front, rear, left and right, the No. 1 fixing hole 65 is provided with the matching No. 1 screw 61, and the No. 1 cross plate 57 is provided with the No. 1 fixing hole 65 matching the No. 1 screw holes 67, there are five No. 1 screw holes 67, and the five No. position, the No. 1 screw 61 penetrates the No. 1 screw hole 67 and is threadedly connected to the No. 1 fixing hole 65 .

Preferably, the No. 2 bellows piston rod 25 includes the No. 2 sealing gland 26 , the No. 2 cylinder lower cover 27 and the No. 2 pressing block 29 are both connected to the No. 2 sealing gland 26 . connect. The No. 2 first sealing ring 28 is disposed at the contact point between the No. 2 sealing gland 26 and the inner wall of the No. 2 cylinder barrel 33 . The No. 2 bellows piston rod 25 also includes the No. 2 piston main rod 45 and the No. 2 bellows 30. The No. 2 bellows 30 is sleeved into the No. 2 piston main rod 45, and the No. 2 bellows The No. 2 bellows 30 is connected to the No. 2 piston main rod 45 by welding. The No. 2 bellows welding plate 46 is provided at one end of the No. 2 piston main rod 45 away from the No. 2 sealing gland 26 , and the No. 2 bellows 30 is located at the No. 2 piston 47 and the No. 2 seal Between the glands 26, one end of the No. 2 bellows 30 is welded to the No. 2 bellows welding plate 46, the other end is welded to the No. 2 sealing gland 26, and the middle section between the two ends is connected to the The main rod 45 of the No. 2 piston is in close contact. The diameter of the No. 2 bellows 30 is smaller than the diameter of the No. 2 sealing gland 26 .

More preferably, the No. 2 piston 47 includes the No. 2 restrictor plate 32, the No. 2 through hole is provided in the middle of the No. 2 restrictor plate 32, and the No. 2 through hole is connected with the No. 2 corrugation. The pipe piston rod 25 is matched, and the No. 2 bellows piston rod 25 is connected to the No. 2 restrictor plate 32 through the No. 2 through hole. The No. 2 restrictor 32 is provided with the No. 2 retaining ring 31 on the side close to the No. 2 cylinder lower cover 27 , and the No. 2 retaining ring 31 is fastened to the No. 2 bellows piston rod 25 . The No. 2 upper vent hole and the No. 2 lower vent hole are located on both sides of the No. 2 piston 47 respectively. The No. 2 gasket 34 is provided at the connection between the No. 2 cylinder top cover 51 and the No. 2 cylinder barrel 33 . The No. 2 second sealing ring 48 is provided where the No. 2 piston main rod 45 is in contact with the No. 2 installation groove 50 .

Wherein, as shown in FIG. 5 , the No. 2 piston 47 is provided with the No. 2 installation groove 50 on the side close to the No. 2 cylinder top cover 51 , the No. 2 installation groove 50 is an annular groove, and the No. The installation groove 50 is arranged concentrically with the No. 2 through hole, the No. 2 installation groove 50 is provided with the No. 2 threaded hole 71, and the No. 2 threaded hole 71 is provided with the matching No. 2 bolt 69, so There are four No. 2 threaded holes 71 , and the four No. 2 threaded holes 71 are distributed in a cross. The No. 2 piston main rod 45 is provided with the No. 2 cross groove on one side of the No. 2 cylinder top cover 51 . 70. The No. 2 cross slot 70 is provided with the matching No. 2 cross plate 49, the No. 2 cross plate 49 is provided with the No. 2 mounting hole 73, and the No. 2 mounting hole 73 has four, The four No. 2 mounting holes 73 are respectively located in the front, rear, left, right, and right directions of the No. 2 cross plate 49. The No. 2 mounting holes 73 are matched with the No. 2 threaded holes 71. The No. 2 piston main rod 45 penetrates through the No. 2 through hole and contacts the No. 2 installation slot 50, the No. 2 cross plate 49 is inserted into the No. 2 cross slot 70, and the No. 2 bolt 69 penetrates through the No. 2 installation hole 73 and The No. 2 threaded hole 71 is threadedly connected, the No. 2 cross groove 70 is provided with the No. 2 fixing hole 72, there are five No. 2 fixing holes 72, and the five No. 2 fixing holes 72 are located in the The center position of the No. 2 cross slot 70 and the four directions of front, rear, left, right, and right, the No. 2 fixing hole 72 is provided with the No. 2 screw 68 that matches, and the No. 2 cross plate 49 is provided with the No. 2 fixed The No. 2 screw holes 74 that match the holes 72, there are five No. 2 screw holes 74, and the five No. 2 screw holes 74 are respectively located at the center position of the No. 2 cross plate 49 and the four directions of front, rear, left and right. The No. 2 screw 68 penetrates through the No. 2 screw hole 74 and is threadedly connected to the No. 2 fixing hole 72 .

The above-mentioned embodiments are used to illustrate the present invention, but not to limit the present invention, so the change of the exemplified numerical value or the replacement of the equivalent elements should still belong to the scope of the present invention.

From the above detailed description, those skilled in the art can understand that the present invention can indeed achieve the aforementioned objects, and it has already complied with the provisions of the Patent Law, and a patent application is now filed.

Claims (3)

1. An integrated bellows shaft seal cylinder is characterized by comprising a cylinder barrel, a cylinder top cover, a cylinder lower cover, a piston, a bellows piston rod, a pressing block and a vent hole, the cylinder top cover and the cylinder lower cover are respectively arranged at openings at two ends of the cylinder barrel, the piston is arranged in the cylinder barrel, the piston is in close contact with the inner wall of the cylinder barrel, the corrugated pipe piston rod is arranged at the joint of the cylinder barrel and the lower cover of the cylinder, one end of the piston rod of the corrugated pipe is connected with the lower cover of the cylinder, the other end of the piston rod of the corrugated pipe is connected with the piston, the compressing block is arranged on the cylinder barrel close to the piston rod of the corrugated pipe, one end of the compressing block is connected with the inner wall of the cylinder barrel, the other end of the compressing block is connected with the piston rod of the corrugated pipe, the air holes are arranged on the surface of the cylinder barrel and comprise upper air holes and lower air holes.

2. The integrated bellows shaft seal cylinder of claim 1, wherein the bellows piston rod further comprises a piston main rod and a bellows, the bellows is sleeved into the piston main rod, and the bellows is welded to the piston main rod.

3. The integrated bellows shaft seal cylinder according to claim 2, wherein a bellows welding plate is disposed at an end of the piston main rod away from the sealing gland, the bellows is located between the piston and the piston, one end of the bellows is welded to the bellows welding plate, the other end of the bellows is welded to the sealing gland, and a middle section between the two ends of the bellows is in close contact with the piston main rod, i.e., the bellows and the piston main rod form an integrated dynamic sealing structure of the bellows shaft seal.

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