CN112879268A

CN112879268A - Piston device for gas compressor

Info

Publication number: CN112879268A
Application number: CN202110066125.4A
Authority: CN
Inventors: 谭汉辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-06-01

Abstract

The invention relates to the technical field of gas compression and discloses a piston device for a gas compressor. The lubricating oil that stops the promotion of last stroke device gliding to in the subsequent motion process of piston rod device, the contact strip can contact with last stroke device, because the structure of lower stroke device and last stroke device is identical, make contact strip and last stroke device contact back and go up stroke device and can retract, lower stroke device contacts and promotes lubricating oil and removes with the interior pipe wall of compression pipe this moment, will circulate above-mentioned process after last piston plate reaches upper limit position, thereby avoided lubricating oil to be pushed outside the stroke range of last piston plate and lower piston plate and can't participate in the problem of lubricated interior pipe wall of compression pipe, the utilization ratio of lubricating oil has been improved.

Description

Piston device for gas compressor

Technical Field

The invention relates to the technical field of gas compression, in particular to a piston device for a gas compressor.

Background

The gas compressor is a very common machine, the principle is that the gas in a pipeline is extruded by a piston, the automatic opening and closing of an air inlet valve and an air outlet valve are automatically controlled by air pressure to realize the gas compression effect, the power of the piston is provided by a crank slide rod driven by a power machine, the piston is in a reciprocating motion state in the pipeline for a long time, lubricating oil is required to be coated in the pipeline to avoid the damage of parts caused by the excessive abrasion of the piston and the inner wall of the pipeline, an oil seal ring is arranged on the outer side of the piston in the existing piston compressor to uniformly coat the lubricating oil on the inner wall of the pipeline, so the friction effect of the piston and the inner wall of the pipeline is effectively reduced, and the service life of the device is prolonged.

However, this kind of lubrication method has a drawback, in the continuous motion process of the piston, the added lubricating oil can be pushed to the two sides of the stroke limit of the oil seal ring under the action of the oil seal ring, so that the lubricating oil can not contact with the oil seal ring, i.e. can not participate in the lubrication action of the pipeline, the lubricating effect of the inner wall of the pipeline is reduced, the effect of the piston and the friction action thereof is improved, the contact part is accelerated to wear and the service life thereof is reduced, and the accumulated lubricating oil can also contact with the air valve to cause the working state of the air valve to be abnormal, thereby affecting the working effect of the device.

Disclosure of Invention

Aiming at the defects of the existing piston device of the gas compressor in the background technology in the using process, the invention provides the piston device for the gas compressor, which has the advantage of improving the lubricating effect of lubricating oil on the inner wall of the pipeline and solves the problem that the lubricating oil can not fully lubricate the inner wall of the pipeline because the traditional piston can push the lubricating oil to the two sides of the stroke limit.

The invention provides the following technical scheme: a piston device for a gas compressor comprises a compression pipe, wherein a protrusion part is arranged on the inner wall of the compression pipe and positioned in the middle of the compression pipe, the bottom of the compression pipe is fixedly provided with a limiting sheet, the top of the limiting sheet is movably sleeved with a piston rod device at the position of the center, a lower piston plate is fixedly arranged at the position of the outer surface of the piston rod device close to one end, a lower stroke stop device is fixedly arranged at the position of the top of the lower piston plate at the center, a piston cavity is fixedly arranged at the position close to the outer side of the top of the lower piston plate, an upper piston plate is fixedly arranged at the top of the piston cavity, an upper stop device is fixedly arranged at the position of the center of the bottom of the upper piston plate, a lower insertion hole is arranged at the top of the lower piston plate, the bottom of the upper piston plate is provided with an upper insertion hole, and the lower insertion hole and the upper insertion hole correspond to the piston rod device.

Preferably, the piston rod device includes the connecting rod, the bottom fixed mounting of connecting rod has the shaft coupling, the top fixed mounting of connecting rod has connecting strip and connecting strip quantity to be six and distribute with annular array's mode, the connecting strip runs through down the piston plate and passes down the top of ending journey device and extending to ending journey device down, the top fixed mounting of connecting strip has the fixed column, the fixed equal fixed mounting in both ends of fixed column has contact strip, contact strip distributes with the mode of slope, contact strip quantity is eight and two and distributes for a set of and with annular array's mode, contact strip is corresponding with ending journey device down and ending journey device, contact strip is corresponding with lower patchhole and last patchhole.

Preferably, the lower stroke stopping device comprises a hexagonal fixed block, the hexagonal fixed block is hexagonal, a single-layer movable device and three layers of movable devices are fixedly mounted on the outer surface of the hexagonal fixed block, and the single-layer movable device and the three layers of movable devices are distributed in an alternating mode.

Preferably, the single-layer movable device comprises a single-layer plate, the single-layer plate is matched with three-layer movable devices, protruding blocks are fixedly mounted at positions, located in the middle, of two sides of the single-layer plate, mounting holes I are formed in the tops of the protruding blocks, limiting blocks I are fixedly mounted at one ends of the inner portions of the mounting holes I, travel rods I are fixedly mounted at one ends of the limiting blocks I and penetrate through the protruding blocks and extend to the outer sides of the single-layer plate, the limiting blocks I are fixedly connected with a piston cavity, one ends of the travel rods I are fixedly connected with a hexagonal fixing block, reset springs I are sleeved on the outer sides of the travel rods I, one ends of the reset springs I are fixedly connected with the limiting blocks I, the other ends of the reset springs I are fixedly connected with the other ends of the inner portions of the mounting holes I, rubber strips I are fixedly mounted on the outer surface of the single-layer plate, the contact hole I corresponds to the contact strip.

Preferably, the three-layer movable device comprises a three-layer plate, the thickness of the three-layer plate is three times that of the single-layer plate, two sides of the three-layer plate are provided with limit grooves, the three-layer plate is matched with the single-layer plate through the limit grooves, the top of the three-layer plate is provided with a mounting hole II, one end inside the mounting hole II is fixedly provided with a limit block II, the limit block II is fixedly connected with the piston cavity, one end of the limit block II is fixedly provided with a stroke rod II, the stroke rod II penetrates through the three-layer plate and is fixedly connected with a hexagonal fixing block, the outer side of the stroke rod II is sleeved with a reset spring II, one end of the reset spring II is fixedly connected with the limit block II, the other end of the reset spring II is fixedly connected with the other end inside the mounting hole II, contact holes II are formed in positions, and a rubber strip II is fixedly arranged on the outer surface of the three-layer plate.

Preferably, the rubber strips I and II are made of rubber.

Preferably, the lower stop device and the upper stop device have the same structure.

Preferably, the upper piston plate is located above the projection when the upper piston plate reaches the upper limit position in the compression tube, and the lower piston plate is located below the projection when the lower piston plate reaches the lower limit position in the compression tube.

The invention has the following beneficial effects:

1. the contact strips are corresponding to the contact strips through the contact holes I and the contact holes II, so that the contact strips can be in contact with the contact holes I and the contact holes II in the lower stop device in the process that the piston rod device moves in the vertical downward direction in figure 2, the contact strips are distributed in an inclined mode, the single-layer plate and the three-layer plate can move towards the axial direction of the hexagonal fixed block in the process that the contact holes I and the contact holes II are in contact with the contact strips, at the moment, the single-layer movable device and the three-layer movable device are retracted and are separated from contact with the inside of the compression pipe, the lower stop device cannot be in contact with lubricating oil in the process that the piston rod device moves in the vertical upward direction in figure 2, the contact strips are separated from contact with the upper stop device in the process and are lifted out under the action of the spring and are in contact with the inner wall of the compression pipe, and the lubricating oil on, when the lower piston plate reaches the lower limit position, the lower piston plate starts to move in the upward direction of the numerical value in fig. 2, because the upper piston plate is positioned below the protruding part when the lower piston plate reaches the lower limit position in the compression pipe, and the upper stop device is in the unfolded state at the moment, the upper stop device is subjected to resistance from the upper stop device in the process of moving along with the movement of the lower piston plate, so that the contact strip is separated from the lower stop device, the lower stop device is unfolded under the action of the return spring I, the rubber strip II and the rubber strip I are contacted with the inner wall of the compression pipe, lubricating oil pushed by the upper stop device is prevented from sliding downwards, in the subsequent movement process of the piston rod device, the contact strip is contacted with the upper stop device, and because the structures of the lower stop device and the upper stop device are completely the same, the contact strip is contacted with the upper stop device and can retract, at this moment, lower journey device contacts and promotes lubricating oil and removes with the interior pipe wall of compression pipe, will circulate above-mentioned process after last piston plate reaches upper limit position, thereby avoided lubricating oil to be pushed to the stroke scope of last piston plate and lower piston plate outside and can't participate in the problem of lubricated interior pipe wall of compression pipe, the utilization ratio of lubricating oil has been improved, simultaneously, under the effect of opening and shutting in turn through lower journey device and last journey device, lubricating oil can be in under journey device and last journey device within the region between always, thereby avoided lubricating oil to flow into to pneumatic valve department and make pneumatic valve operating condition abnormal.

2. The lower stroke stopping device and the upper stroke stopping device are opened and closed in turn, the rubber strips I and the rubber strips II are made of rubber, so that the main body of the piston cannot be in direct contact with the inner pipe wall of the compression pipe in the movement process of the piston, the main contact parts of the rubber strips I and the rubber strips II are the rubber strips I and the rubber strips II and bear main abrasion, when the rubber strips I and the rubber strips II reach the service life due to abrasion, only the rubber strips I and the rubber strips II are needed to be replaced independently, compared with the traditional compression device, the piston main body is in direct contact with the inner pipe wall of the compression pipe in the movement process and is abraded, the piston main body needs to be replaced, the use cost and the maintenance cost of the device are greatly reduced, meanwhile, the contact area between the piston and the compression wall of the inner pipe is greatly reduced by the structure, the heat generated by corresponding friction is reduced, and the temperature inside the compression pipe in the operation process of the device is reduced, the lubricating oil is prevented from being denatured due to self water loss caused by overhigh temperature, and the running stability of the device is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of a piston rod assembly of the present invention;

FIG. 4 is a schematic view of the piston structure of the present invention;

FIG. 5 is a schematic cross-sectional view of a piston structure according to the present invention;

FIG. 6 is a schematic cross-sectional view of a piston plate construction of the present invention;

FIG. 7 is a schematic cross-sectional view of a piston plate structure according to the present invention;

FIG. 8 is a schematic view of a structural lower stop arrangement of the present invention;

FIG. 9 is a schematic view of a single-layered mobile device of the present invention;

FIG. 10 is a schematic view of a three-layered mobile device according to the present invention.

In the figure: 1. compressing the tube; 2. a protrusion; 3. a limiting sheet; 4. a piston rod arrangement; 41. a connecting rod; 42. a coupling; 43. a connecting strip; 44. fixing a column; 45. a contact bar; 5. a lower piston plate; 6. a lower stroke stop device; 61. a hexagonal fixed block; 62. a single-layer mobile device; 621. a single ply board; 622. a protruding block; 623. a mounting hole I; 624. a limiting block I; 625. a travel rod I; 626. a return spring I; 627. a rubber strip I; 628. a contact hole I; 63. three layers of movable devices; 631. three-layer plates; 632. a limiting groove; 633. mounting holes II; 634. a limiting block II; 635. a stroke rod II; 636. a return spring II; 637. a contact hole II; 638. a rubber strip II; 7. a piston cavity; 8. an upper piston plate; 9. an upper stop device; 10. a lower insertion hole; 11. and an upper insertion hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 10, a piston assembly for a gas compressor includes a compression tube 1, and is characterized in that: the compression pipe comprises a compression pipe 1, a protrusion part 2 is arranged on the inner wall of the compression pipe 1 and positioned in the middle of the compression pipe, a limiting sheet 3 is fixedly arranged at the bottom of the compression pipe 1, a piston rod device 4 is movably sleeved on the position, positioned in the center, of the top of the limiting sheet 3, a connecting rod device 4 is arranged, the piston rod device 4 comprises a connecting rod 41, a coupler 42 is fixedly arranged at the bottom of the connecting rod 41, connecting strips 43 are fixedly arranged at the top of the connecting rod 41, the number of the connecting strips 43 is six, the connecting strips 43 are distributed in an annular array mode, the connecting strips 43 penetrate through a lower piston plate 5, penetrate through a lower stroke stopping device 6 and extend to the upper side of the lower stroke stopping device 6, a fixing column 44 is fixedly arranged at the top of the connecting strips 43, contact strips 45 are fixedly arranged at two ends of the fixing column 44, the contact strips 45 are distributed in an inclined mode, the number of the, the contact strip 45 corresponds to the lower insertion hole 10 and the upper insertion hole 11, the lower piston plate 5 is fixedly installed at a position, close to one end, of the outer surface of the piston rod device 4, the lower stroke stopping device 6 is fixedly installed at a position, located at the center, of the top of the lower piston plate 5, the lower stroke stopping device 6 comprises a hexagonal fixing block 61, the hexagonal fixing block 61 is hexagonal in shape, a single-layer movable device 62 and a three-layer movable device 63 are fixedly installed on the outer surface of the hexagonal fixing block 61, the single-layer movable device 62 comprises a single-layer plate 621, the single-layer plate 621 is matched with the three-layer movable device 63, protruding blocks 622 are fixedly installed at positions, located at the middle of two sides of the single-layer plate 621, the tops of the protruding blocks 622 are provided with mounting holes I623, a limiting block I624 is fixedly installed at one end inside the mounting holes I623, a stroke rod I625 is fixedly installed, the limiting block I624 is fixedly connected with the piston cavity 7, one end of a stroke rod I625 is fixedly connected with the hexagonal fixing block 61, a return spring I626 is sleeved outside the stroke rod I625, one end of the return spring I626 is fixedly connected with the limiting block I624, the other end of the return spring I626 is fixedly connected with the other end inside the mounting hole I623, a rubber strip I627 is fixedly installed on the outer surface of the single-layer plate 621, contact holes I628 are formed in the top of the protruding block 622 and located on two sides of the mounting hole I623, the contact holes I628 correspond to the contact strips 45, the three-layer movable device 63 comprises a three-layer plate 631, the thickness of the three-layer plate 631 is three times that of the single-layer plate 621, limiting grooves 632 are formed in two sides of the three-layer plate 631, the three-layer plate 631 is matched with the single-layer plate 621 through the limiting grooves 632, a mounting hole II 633 is formed in the top of the, a stroke rod II 635 is fixedly mounted at one end of a limiting block II 634, the stroke rod II 635 penetrates through a three-layer plate 631 and is fixedly connected with a hexagonal fixing block 61, a return spring II 636 is sleeved outside the stroke rod II 635, one end of the return spring II 636 is fixedly connected with the limiting block II 634, the other end of the return spring II 636 is fixedly connected with the other end inside a mounting hole II 633, contact holes II 637 are formed in positions, which are located on two sides of the mounting hole II 633, of the top of the three-layer plate 631, the contact holes II 637 correspond to the contact strips 45, a rubber strip II 638 is fixedly mounted on the outer surface of the three-layer plate 631, the rubber strips I627 and II 638 are made of rubber, the single-layer moving devices 62 and the three-layer moving devices 63 are distributed in an alternating mode, a piston cavity 7 is fixedly mounted at a position, which is close to the outer side, at the, go up piston plate 8 and reach lower piston plate 5 and be located 2 tops of protruding portion when last extreme position in compression pipe 1, lower piston plate 5 goes up piston plate 8 and is located 2 below of protruding portion when reaching lower extreme position in compression pipe 1, it has last stroke device 9 to go up fixed mounting on the position that 8 bottoms of piston plate are located the center, it is identical with the structure of last stroke device 9 to end stroke device 6 down, lower patchhole 10 has been seted up at the top of lower piston plate 5, go up patchhole 11 has been seted up to the bottom of piston plate 8, lower patchhole 10 and last patchhole 11 all correspond with piston rod device 4.

Wherein, the contact bar 45 is contacted with the contact holes I628 and II 637 in the lower stop device 6 through the contact holes I628 and II 637 corresponding to the contact bar 45 in the process of moving the piston rod device 4 in the vertical downward direction in FIG. 2, the contact holes I628 and II 637 are distributed in an inclined manner through the contact bar 45, so that the contact holes I628 and II 637 can move the single-layer plate 621 and the three-layer plate 631 towards the axial direction of the hexagonal fixed block 61 in the process of contacting with the contact bar 45, at the same time, the single-layer movable device 62 and the three-layer movable device 63 retract and are separated from the contact with the inside of the compression tube 1, so that the lower stop device 6 can not be contacted with the lubricating oil in the process of moving the piston rod device 4 in the vertical upward direction in FIG. 2, and the contact bar 45 is separated from the upper stop device 9 in the process and rises and is contacted with the inner wall of the compression tube 1 under the action of the spring, thereby pushing the lubricant on the inner wall of the compression tube 1 to move, and after the lower piston plate 5 reaches the lower limit position, beginning to move in the upward direction of the numerical value in fig. 2, because the upper piston plate 8 is located below the protrusion 2 when the lower piston plate 5 reaches the lower limit position in the compression tube 1, and at this time, the upper stop device 9 is in the unfolded state, so that the upper stop device 9 receives the resistance from the upper stop device 9 during the simultaneous movement of the lower piston plate 5, so that the contact strip 45 is separated from the lower stop device 6 and the lower stop device 6 is unfolded by the action of the return spring i 626 and the rubber strips ii 638 and i 627 are in contact with the inner wall of the compression tube 1, thereby preventing the lubricant pushed by the upper stop device 9 from sliding downwards, and during the subsequent movement of the piston rod device 4, the contact strip 45 is in contact with the upper stop device 9, because the structures of the lower stroke stopping device 6 and the upper stroke stopping device 9 are completely the same, the upper stroke stopping device 9 can retract after the contact strip 45 contacts with the upper stroke stopping device 9, at the moment, the lower stroke stopping device 6 contacts with the inner pipe wall of the compression pipe 1 and pushes lubricating oil to move, the process can be circulated after the upper piston plate 8 reaches the upper limit position, the problem that the lubricating oil is pushed to the outside of the stroke range of the upper piston plate 8 and the lower piston plate 5 and cannot participate in lubricating the inner pipe wall of the compression pipe 1 is avoided, the utilization rate of the lubricating oil is improved, meanwhile, under the effect of alternate opening and closing of the lower stroke stopping device 6 and the upper stroke stopping device 9, the lubricating oil can be always in the area between the lower stroke stopping device 6 and the upper stroke stopping device 9, and the phenomenon that the lubricating oil flows into the air valve so that the air valve is in an abnormal.

Wherein, through the alternate opening and closing of the lower stop device 6 and the upper stop device 9, and the rubber strips I627 and II 638 are made of rubber, so that the main body of the piston does not directly contact with the inner pipe wall of the compression pipe 1 during the movement of the piston, and the main contact part is the rubber strips I627 and II 638 and bears the main abrasion, when the rubber strips I627 and II 638 are worn to reach the service life, only the rubber strips I627 and II 638 need to be replaced independently, compared with the traditional compression device, the piston main body directly contacts with the inner pipe wall of the compression pipe 1 during the movement to be worn, the piston main body needs to be replaced, the use cost and maintenance cost of the device are greatly reduced, meanwhile, the structure greatly reduces the contact area between the piston and the inner pipe wall of the compression pipe 1, thereby reducing the heat generated by friction, the temperature inside the compression pipe 1 in the operation process of the device is reduced, the phenomenon that the lubricating oil is denatured due to the loss of water caused by overhigh temperature is avoided, and the operation stability of the device is improved.

The using method of the invention is as follows:

in use, the contact bar 45 will contact the contact holes i 628 and ii 637 in the lower stop device 6 during the movement of the piston rod device 4 in the vertical downward direction in fig. 2, the contact holes i 628 and ii 637 will make the single-layer plate 621 and the three-layer plate 631 move toward the axial direction of the hexagonal fixed block 61 during the contact with the contact bar 45, at this time, the single-layer movable device 62 and the three-layer movable device 63 will retract and disengage from the inside of the compression tube 1, so that the lower stop device 6 cannot contact the lubricant during the movement of the piston rod device 4 in the vertical upward direction in fig. 2, and the contact bar 45 will disengage from the upper stop device 9 and rise out under the action of the spring and contact with the inner wall of the compression tube 1, thereby pushing the lubricant on the inner wall of the compression tube 1 to move, and after the lower piston plate 5 reaches the lower limit position, will start to move in the upward direction of the numerical value in fig. 2, because the upper piston plate 8 is positioned below the protruding part 2 when the lower piston plate 5 reaches the lower limit position in the compression pipe 1, and the upper stop device 9 is in the unfolded state at this time, the upper stop device 9 is subjected to resistance from the upper stop device 9 during the process of moving along with the movement of the lower piston plate 5, so that the contact strip 45 is separated from the lower stop device 6, the lower stop device 6 is unfolded under the action of the return spring i 626, and the rubber strips ii 638 and i 627 are contacted with the inner wall of the compression pipe 1, so as to prevent the lubricating oil pushed by the upper stop device 9 from sliding downwards, and during the subsequent movement of the piston rod device 4, the contact strip 45 is contacted with the upper stop device 9, and because the structure of the lower stop device 6 is completely the same as that of the upper stop device 9, the upper stop device 9 retracts after the contact strip 45 is contacted with the upper stop device 9, the lower stop means 6 is now in contact with the inner pipe wall of the compression pipe 1 and pushes the lubricant oil to move, which is circulated when the upper piston plate 8 reaches the upper limit position.

In the operation process, in the motion process of piston, the main part of piston can not with the interior pipe wall direct contact of compression pipe 1, and the part of main contact is rubber strip I627 and rubber strip II 638 and bears main wearing and tearing, after rubber strip I627 and rubber strip II 638 reach life because of wearing and tearing, only need to replace rubber strip I627 and rubber strip II 638 alone can, simultaneously, this structure greatly reduced the area of contact of piston and the interior pipe wall of compression pipe 1 to the heat that should rub and produce has been reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Piston device for a gas compressor, comprising a compression tube (1), characterized in that: the compression pipe is characterized in that a protruding portion (2) is arranged on the inner wall of the compression pipe (1) and located at the middle of the compression pipe, a limiting piece (3) is fixedly arranged at the bottom of the compression pipe (1), a piston rod device (4) is movably sleeved on the position, located at the center, of the top of the limiting piece (3), a lower piston plate (5) is fixedly arranged on the position, close to one end, of the outer surface of the piston rod device (4), a lower stop device (6) is fixedly arranged on the position, located at the center, of the top of the lower piston plate (5), a piston cavity (7) is fixedly arranged on the position, close to the outer side, of the top of the lower piston plate (5), an upper piston plate (8) is fixedly arranged at the top of the piston cavity (7), an upper stop device (9) is fixedly arranged on the position, located at the center, of the bottom of the upper piston plate (, an upper insertion hole (11) is formed in the bottom of the upper piston plate (8), and the lower insertion hole (10) and the upper insertion hole (11) correspond to the piston rod device (4).

2. A piston device for a gas compressor, according to claim 1, characterized in that: the piston rod device (4) comprises a connecting rod (41), a coupler (42) is fixedly mounted at the bottom of the connecting rod (41), connecting strips (43) are fixedly mounted at the top of the connecting rod (41), the number of the connecting strips (43) is six, the connecting strips are distributed in an annular array mode, the connecting strips (43) penetrate through a lower piston plate (5), penetrate through a lower stroke stopping device (6) and extend to the upper portion of the lower stroke stopping device (6), fixing columns (44) are fixedly mounted at the top of the connecting strips (43), contact strips (45) are fixedly mounted at two ends of each fixing column (44), the contact strips (45) are distributed in an inclined mode, the number of the contact strips (45) is eight, the two contact strips are one group and distributed in an annular array mode, and the contact strips (45) correspond to the lower stroke stopping device (6) and the upper stroke stopping device (9), the contact bar (45) corresponds to the lower insertion hole (10) and the upper insertion hole (11).

3. A piston device for a gas compressor, according to claim 2, characterized in that: the lower stroke stopping device (6) comprises a hexagonal fixed block (61), the hexagonal fixed block (61) is hexagonal, a single-layer movable device (62) and three-layer movable devices (63) are fixedly mounted on the outer surface of the hexagonal fixed block (61), and the single-layer movable devices (62) and the three-layer movable devices (63) are distributed in an alternating mode.

4. A piston device for a gas compressor, according to claim 3, characterized in that: individual layer movable device (62) are including individual layer board (621), individual layer board (621) cooperatees with three-layer movable device (63), equal fixed mounting has protruding piece (622) on the position that individual layer board (621) both sides are located the centre, mounting hole I (623) have been seted up at the top of protruding piece (622), the inside one end fixed mounting of mounting hole I (623) has stopper I (624), the one end fixed mounting of stopper I (624) has stroke pole I (625) and stroke pole I (625) to run through protruding piece (622) and extend to the outside of individual layer board (621), stopper I (624) and piston cavity (7) fixed connection, the one end and hexagon fixed block (61) fixed connection of stroke pole I (625), the outside cover of stroke pole I (625) is equipped with reset spring I (626), the one end and the other end of stopper I (624) fixed connection and reset spring I (626) and ann of stopper I (624) are equipped with reset spring I (626), reset spring I (626) and are installed The other end fixed connection of dress hole I (623) inside, the fixed surface of single layer board (621) installs rubber strip I (627), contact hole I (628) have been seted up at protruding piece (622) top and the both sides that are located mounting hole I (623), contact hole I (628) and contact strip (45) are corresponding.

5. A piston device for a gas compressor, according to claim 4, characterized in that: three-layer movable device (63) includes three-layer board (631), three-layer board (631) thickness is the triple of individual layer board (621) thickness, spacing groove (632) and three-layer board (631) have been seted up to the both sides of three-layer board (631) and have been cooperateed through spacing groove (632) and individual layer board (621), mounting hole II (633) have been seted up at the top of three-layer board (631), inside one end fixed mounting of mounting hole II (633) has stopper II (634) and piston cavity (7) fixed connection, the one end fixed mounting of stopper II (634) has stroke pole II (635) and stroke pole II (635) to run through three-layer board (631) and with hexagon fixed block (61) fixed connection, the outside cover of stroke pole II (635) is equipped with reset spring II (636), the other end and another inside mounting hole (633) of the other end of reset spring II (636) and stopper II (634) fixed connection and reset spring II (636), reset spring II (636) are reset spring II (636) The three-layer plate (631) is fixedly connected, contact holes II (637) are formed in positions, located on two sides of the mounting hole II (633), of the top of the three-layer plate (631), the contact holes II (637) correspond to the contact strips (45), and rubber strips II (638) are fixedly mounted on the outer surface of the three-layer plate (631).

6. A piston device for a gas compressor, according to claim 5, characterized in that: the rubber strips I (627) and II (638) are made of rubber.

7. A piston device for a gas compressor, according to claim 1, characterized in that: the lower stop device (6) and the upper stop device (9) have the same structure.

8. A piston device for a gas compressor, according to claim 1, characterized in that: the upper piston plate (8) is located above the projection (2) when the upper piston plate (5) reaches the upper limit position in the compression tube (1), and the lower piston plate (5) is located below the projection (2) when the lower piston plate (8) reaches the lower limit position in the compression tube (1).