CN102889196A - Threaded connecting structure of differential piston - Google Patents
Threaded connecting structure of differential piston Download PDFInfo
- Publication number
- CN102889196A CN102889196A CN2012103808976A CN201210380897A CN102889196A CN 102889196 A CN102889196 A CN 102889196A CN 2012103808976 A CN2012103808976 A CN 2012103808976A CN 201210380897 A CN201210380897 A CN 201210380897A CN 102889196 A CN102889196 A CN 102889196A
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- piston
- locking nut
- piston rod
- thread
- outer hexagon
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- Pistons, Piston Rings, And Cylinders (AREA)
- Compressor (AREA)
Abstract
The invention discloses a threaded connecting structure of a differential piston used for a differential piston in a piston type compressor. The threaded connecting structure comprises a piston, a piston rod, a locknut, steel pads, an outer hexagonal wrench and an inner hexagonal wrench, and is characterized in that a part on the piston rod, which is connected with the piston, is provided with a screw thread, an internal thread is arranged in the locknut, the screw thread on the piston rod is matched with the design of an internal thread of the locknut, and the diameters are equal, and the steel pads are respectively arranged between the piston and a shaft shoulder, and between the piston and the locknut. Through the technical scheme provided by the invention, the connecting mechanism of the differential piston has the advantages of simple structure, un-harsh installation and working operation conditions, simple maintenance and adjustment, and durability.
Description
Technical field
The present invention relates to the mechanical connecting device technical field, specifically be used for the bindiny mechanism of piston compressor step piston.
Background technique
At present, the step piston structures that adopt in piston compressor more, the Placement of step piston common are double-spherical floating connection or the use of needle bearing connection fitted shaft seal arrangement in the prior art.Patent CN1793648 double-spherical floating connecting structure of compressor, the double-spherical floating that discloses connects technical characteristics, high pressure stage piston and low pressure stage piston adopt and are rigidly connected, the low pressure piston bar is contained in the low pressure stage piston cavity, its technical characteristics is contained in by concave surface ball pad and convex surface ball cushion cover and forms one group of sphere on the high pressure stage piston rod, convex surface ball pad and concave surface ball pad are installed in the low pressure stage piston cavity are formed another group sphere, at low pressure stage piston and concave surface ball pad and convex surface ball pad, between convex surface ball pad and concave surface ball pad composition sphere adjusting sleeve is housed, the differential piston of this double-spherical floating connecting structure can guarantee the accurate linarity of piston rod and piston movement, reduces the wearing and tearing of high pressure stage cylinder liner and piston.Patent CN201027612 full-oil-free lubrication step piston type air compressor then discloses its step piston and has adopted needle bearing, seal ring to be connected with wrist pin.
And than the Placement of low pressure stage piston and piston rod interference fit commonly, although avoided between parts excessive the causing of matching gap easily to come off or the too small assembling difficulty that causes of matching gap, but in actual hot charging process, the defective that also has the installation conditions harshness: on the one hand, because material, size, magnitude of interference, heating-up temperature, the difference of heating time of rigid connector such as piston and piston rod, can cause piston rod bending deflection, thereby cause fault even the problem such as scrap; On the other hand, the factors such as in the compressor operating process, inertial force is excessive, cylinder operation excess Temperature, gas pressure pulsation can cause piston to come off, even equipment are out of service, cause certain economic loss.
Summary of the invention
The objective of the invention is to overcome defects and deficiency in the prior art, a kind of simple structure is provided, the bindiny mechanism that installation and work operating conditions are not harsh, easy and durable step piston is adjusted in maintenance.Important innovation is that also although common two-way ram also adopts locking nut and piston rod to tighten, two-way ram is fixed on the piston rod end, and the outer hexagon of tightening locking nut is solid.By contrast, outer hexagon of the present invention is hollow, and outer hexagon can pass piston rod and arrive step piston, thereby has realized the fastening of step piston and piston rod.
The present invention is achieved by the following technical solutions:
A kind of thread type step piston linkage structure comprises piston, piston rod, locking nut, outer hexagon and allen wrench, it is characterized in that the position that is connected with piston on piston rod is provided with screw thread, and locking nut is provided with internal thread.Screw thread on the piston rod and the design of locking nut internal thread match, and equal diameters.Between piston and the shaft shoulder, piston and locking nut, be provided with the steel pad.
When piston is steel material, can cancel the steel pad between piston and the shaft shoulder, piston and the locking nut.
When locking nut and outer hexagon pass piston rod length and its equal diameters, adopt allen wrench and outer hexagon to combine locking nut screwing.
Description of drawings
Fig. 1 is the structural representation of interference fit connection set;
Fig. 2 is the structural representation of a kind of thread type step piston of the present invention Placement;
Fig. 3 is the structural representation of locking nut among the present invention;
Fig. 4 is the structural representation of the present invention China and foreign countries hexagon;
Fig. 5 is the structural representation of allen wrench among the present invention;
In the accompanying drawing 1,1 piston, 2 piston rods;
In the accompanying drawing 2,1 piston, 2 piston rods, 3 locking nuts, 4 steel pads, 5 outer hexagons and 6 allen wrench.
Embodiment
Below in conjunction with accompanying drawing 1 and Fig. 2 the specific embodiment of the invention is made further explanation:
Preferentially, a kind of thread type step piston of the present invention Placement comprises piston 1, piston rod 2, locking nut 3, steel pad 4, outer hexagon 5 and allen wrench 6, it is characterized in that, the position that is connected with piston 1 on piston rod 2 is provided with screw thread, and locking nut 3 is provided with internal thread.
Internal thread design on screw thread among the present invention on the piston rod 2 and the locking nut 3 matches, and two kinds of diameters of thread equate.
The present invention is provided with several steel pads 4 between piston 1 and the shaft shoulder, piston 1 and locking nut 3.
When piston 1 is steel material, can cancel steel pad 4 between piston 1 and the shaft shoulder, piston 1 and the locking nut 3.
When locking nut 3 and outer hexagon 5 pass piston rod length and its equal diameters, adopt allen wrench 6 and outer hexagon 5 to combine locking nut 3 is tightened.
Wherein, in implementation process, diameter of piston rod is 1.125 inches, with the screw thread of piston connection part be 1.25 "-12UNF (U.S. unifies screw thread, closely-pitched), the internal thread of locking nut is 1.25 "-12UNF, path is 1.1598 ".The diameter of bore of outer hexagon also is slightly larger than 1.125 inches, when locking nut and outer hexagon pass the position of 1.125 inches of diameter of piston rod, uses allen wrench 6 and outer hexagon 5 that locking nut 3 is tightened.
Further, when piston 1 adopts aluminum material, between piston 1 and the shaft shoulder, piston 1 and locking nut 3, steel pad 4 is set.If the material of piston 1 is steel, can save steel pad 4.
Above-described embodiment is used for explaining technological scheme of the present invention; but be not as limitation of the invention; in addition to the implementation; the present invention can also have other mode of execution; all in inner characteristic scope of the present invention; employing is equal to the technological scheme of replacement or equivalent transformation, all drops in the protection domain of claim of the present invention.
Claims (3)
1. thread type step piston linkage structure, comprise piston (1), piston rod (2), locking nut (3), steel pad (4), outer hexagon (5) and allen wrench (6), it is characterized in that, be provided with screw thread at the upper position that is connected with piston (1) of piston rod (2), locking nut is provided with internal thread, screw thread on the piston rod (2) and the design of locking nut internal thread match, and equal diameters is provided with several steel pads (4) between piston (1) and the shaft shoulder, piston and locking nut.
2. a kind of thread type step piston linkage structure according to claim 1 is characterized in that, when piston (1) is steel material, can cancel steel pad (4) between piston and the shaft shoulder, piston and the locking nut.
3. a kind of thread type step piston linkage structure according to claim 1, it is characterized in that, outer hexagon (5) is hollow, when locking nut (3) and outer hexagon (5) pass the length of piston rod (2) and its equal diameters, adopt allen wrench (6) and outer hexagon (5) to combine locking nut (3) is tightened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210380897.6A CN102889196B (en) | 2012-10-09 | 2012-10-10 | A kind of threaded connecting structure of differential piston |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103791797 | 2012-10-09 | ||
| CN201210379179.7 | 2012-10-09 | ||
| CN201210379179 | 2012-10-09 | ||
| CN201210380897.6A CN102889196B (en) | 2012-10-09 | 2012-10-10 | A kind of threaded connecting structure of differential piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102889196A true CN102889196A (en) | 2013-01-23 |
| CN102889196B CN102889196B (en) | 2017-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210380897.6A Active CN102889196B (en) | 2012-10-09 | 2012-10-10 | A kind of threaded connecting structure of differential piston |
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| Country | Link |
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| CN (1) | CN102889196B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049791A (en) * | 2020-09-22 | 2020-12-08 | 西南石油大学 | Plunger of oil-well pump without traveling valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0393770A1 (en) * | 1989-04-21 | 1990-10-24 | NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. | Crosshead for reciprocating piston machines, in particular for reciprocating compressors |
| CN201474907U (en) * | 2009-08-27 | 2010-05-19 | 自贡通达机器制造有限公司 | Differential piston for compressor |
| CN202047966U (en) * | 2011-04-28 | 2011-11-23 | 沈阳远大压缩机股份有限公司 | Fastening structure for connecting a piston body and a piston rod |
| CN202300919U (en) * | 2011-11-07 | 2012-07-04 | 重庆气体压缩机厂有限责任公司 | Guide piston structure |
| CN202883311U (en) * | 2012-10-09 | 2013-04-17 | 天津凯德实业有限公司 | Thread type differential piston connecting structure |
-
2012
- 2012-10-10 CN CN201210380897.6A patent/CN102889196B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0393770A1 (en) * | 1989-04-21 | 1990-10-24 | NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. | Crosshead for reciprocating piston machines, in particular for reciprocating compressors |
| CN201474907U (en) * | 2009-08-27 | 2010-05-19 | 自贡通达机器制造有限公司 | Differential piston for compressor |
| CN202047966U (en) * | 2011-04-28 | 2011-11-23 | 沈阳远大压缩机股份有限公司 | Fastening structure for connecting a piston body and a piston rod |
| CN202300919U (en) * | 2011-11-07 | 2012-07-04 | 重庆气体压缩机厂有限责任公司 | Guide piston structure |
| CN202883311U (en) * | 2012-10-09 | 2013-04-17 | 天津凯德实业有限公司 | Thread type differential piston connecting structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049791A (en) * | 2020-09-22 | 2020-12-08 | 西南石油大学 | Plunger of oil-well pump without traveling valve |
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| Publication number | Publication date |
|---|---|
| CN102889196B (en) | 2017-10-20 |
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