CN101476558A - Flexible piston rod - Google Patents
Flexible piston rod Download PDFInfo
- Publication number
- CN101476558A CN101476558A CN 200910058244 CN200910058244A CN101476558A CN 101476558 A CN101476558 A CN 101476558A CN 200910058244 CN200910058244 CN 200910058244 CN 200910058244 A CN200910058244 A CN 200910058244A CN 101476558 A CN101476558 A CN 101476558A
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- CN
- China
- Prior art keywords
- piston
- piston rod
- crosshead
- thread
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Pistons, Piston Rings, And Cylinders (AREA)
- Compressor (AREA)
Abstract
The invention relates to a flexible piston rod, which belongs to the technical field manufacture of gas field natural gas conveying supercharging equipment. The flexible piston rod consists of a piston connection end, a middle section and a crosshead connecting end, wherein the piston connecting end is connected to one end of the middle section, and the crosshead connecting end is connected to the other end of the middle section. The flexible piston rod capable of improving the fatigue strength of threaded connection and making the transition of the size reduction of screw threads uniform is designed according to a constant rigidity theory, and the problem that a connection crosshead of the piston rod and a piston screw thread part generate rupture is solved. The flexible piston rod has the characteristics that a flexible section of the piston rod and the strength of a screw thread section tend to be equivalent and the transition of the size reduction of the screw threads is uniform.
Description
Technical field: a kind of flexible piston rod, be used for the split type compressor compresses piston of high-speed high-power and guiding being connected of crosshead, relate to the manufacturing technology field of gas field natural gas transport supercharging equipment.
Background technique: in the gas gathering and transportation supercharging; airlifting oil recovery; gas production; the hydrogen hydrocarbon reclaims; in the operating modes such as volume increase of decay gas well; all need performance good; the high-power split type compressor that reliability is high could be realized; in high-power split type compressor; all the time be in comparatively abominable operating conditions as the piston rod that connects compressor piston and crosshead compressor in service; bearing very big impulsive load and tension and compression stress; therefore; usually rupture at the screw thread position of piston rod connection crosshead and piston; this fracture is the major accident of Reciprocting piston compressor; in case the reliability that fracture will have a strong impact on the split type compressor of high-speed high-power takes place; the meeting damage equipment; cause equipment downtime; finally cause stopping production, influence the conveying of materials such as rock gas, and then influence the ordinary production of related industry.
Summary of the invention: the present invention is directed to the shortcoming of prior art, rigidity theory such as foundation have designed and a kind ofly can improve the fatigue strength that is threaded, and make the place's transition of screw thread reducing even, the flexible piston rod of rigidity unanimity.
The present invention is achieved in that and comprises piston connecting end, intermediate section and crosshead connecting end, it is characterized in that:
The piston connecting end comprises that rods 4, front and back cooperate section 3,5 and piston connecting thread 1, intermediate section is made of seal shaft 6, the piston connecting end is connected of intermediate section, the crosshead connecting end is connected the other end of intermediate section, and the crosshead connecting end comprises crosshead connecting thread 8 and crosshead connecting thread changeover portion 7;
Cooperate section 3 and back to cooperate between the section 5 before described rods 4 is arranged on, between preceding cooperation section and piston connecting thread, be provided with piston thread changeover portion 2;
The diameter of described rods 4 is 0.85 times of footpath, 1 end of described piston connecting thread, and length is identical with piston length;
Between described crosshead connecting thread 8 and seal shaft 6, be provided with crosshead screw thread changeover portion 7;
Described piston connecting thread 1 and crosshead connecting thread 8 can be screw threads, also can be flanges;
The diameter of described piston thread changeover portion 2 is 0.8 times of the core diameter of thread, and length is 20～30 millimeters, and piston thread changeover portion 2 plays and makes the place's transition of screw thread reducing even, and the fatigue ruption under the stress alternation effect is avoided in the effect of rigidity unanimity;
Piston connecting thread 1 of the present invention and crosshead connecting thread 8 apply the moment of torsion of 1.2 times of original structures by nut, flexible piston rod and piston are linked into an integrated entity, in order to improve performance wear-resisting and sealing, the surface of seal section 6 has high hardness, high-precision relative rubbing surface through nitriding treatment; Compliant section can make the load change amplitude that acts on the piston rod reduce, and reach and improve the intensity that is threaded, the purpose that makes the compliant section and the intensity of thread section be tending towards equating, preceding cooperation section 3 and back cooperation section 5 are used for the location with piston;
Effect of the present invention is: the compliant section of piston rod is tending towards equating with thread section intensity, improve the fatigue strength that is threaded, the changeover portion of connecting thread, make the place's transition of screw thread reducing even, the rigidity unanimity, avoided the fatigue ruption under the stress alternation effect, thereby the whole reliability that has promoted piston rod has guaranteed its long lifetime.
Description of drawings:
Accompanying drawing is a structural representation of the present invention.
Embodiment:
Provide embodiments of the invention below in conjunction with accompanying drawing: the present invention is achieved in that and comprises piston connecting end, intermediate section and crosshead connecting end, the piston connecting end comprises that rods 4, front and back cooperate section 3,5 and piston connecting thread 1, intermediate section is made of seal shaft 6, the surface of seal shaft 6 has high hardness, high-precision relative rubbing surface through nitriding treatment; The piston connecting end is connected of intermediate section, the crosshead connecting end is connected the other end of intermediate section, the crosshead connecting end comprises crosshead connecting thread 8 and crosshead connecting thread changeover portion 7, and piston connecting thread 1 and crosshead connecting thread 8 can be screw threads, also can be flange; Before being arranged on, rods 4 cooperate section 3 and back to cooperate between the section 5, between preceding cooperation section 3 and piston connecting thread 1, be provided with piston thread changeover portion 2, rods 4 can make the load change amplitude that acts on the piston rod reduce, reach and improve the intensity that is threaded, the purpose that makes the rods 4 and the intensity of thread section be tending towards equating, preceding cooperation section 3 and back cooperation section 5 are used for the location with piston; Be provided with crosshead connecting thread changeover portion 7 between crosshead connecting thread 8 and the seal shaft 6;
During use, if what the crosshead of compressor was used is to be threaded, just crosshead connecting thread 8 is screwed in the tapped hole of pressure-increasing machine crosshead, if what the crosshead of compressor was used is that flange connects, just will be connected by screw with compressor crosshead by flange behind crosshead connecting thread 8 adpting flanges; When being connected, the screw thread of piston connecting thread 1 by nut, is applied the moment of torsion of 1.2 times of original structures, flexible piston rod of the present invention and piston are linked into an integrated entity with compressor piston; When seal shaft 6 of the present invention is installed, increase stuffing box packing simultaneously, make seal shaft 6 and filler constitute seal jointly, stop the leakage of gas; The diameter of the rods 4 that is provided with is 0.85 times of piston connecting thread 1 core diameter of thread, length is identical with piston length, its effect is that the load amplitude on the piston rod is reduced, and improves the fatigue resistance that is threaded, and makes it to be tending towards equating with the intensity of piston connecting thread 1; Front and back cooperation section 3 and 5 is used for the location with piston, can guarantee the straightness accuracy requirement of outside piston and piston rod; The diameter of piston thread changeover portion 2 is 0.8 times of the core diameter of thread of piston connecting thread 1, and length is 20～30 millimeters, and piston thread changeover portion 2 plays and makes the place's transition of screw thread reducing even, and the fatigue ruption under the stress alternation effect is avoided in the effect of rigidity unanimity; During work, crosshead is passed through in rotatablely moving of compressor connecting bar major part, make flexible piston rod of the present invention carry out linear reciprocating motion, drive compression cylinder work then, realization is to the compression of gas, the rods 4 that is provided with can effectively make the load amplitude on the piston rod reduce, and has improved the fatigue resistance that is threaded, and can effectively overcome piston rod thread place fracture accident.
Claims (6)
1. flexible piston rod, comprise piston connecting end, intermediate section and crosshead connecting end, it is characterized in that: the piston connecting end comprises that rods, front and back cooperate section and piston connecting thread, intermediate section is made of seal shaft, the piston connecting end is connected of intermediate section, the crosshead connecting end is connected the other end of intermediate section, and the crosshead connecting end comprises crosshead connecting thread and crosshead connecting thread changeover portion.
2. flexible piston rod according to claim 1 is characterized in that: cooperate section and back to cooperate between the section before described rods is arranged on, be provided with the piston thread changeover portion between preceding cooperation section and piston connecting thread.
3. flexible piston rod according to claim 1 is characterized in that: the diameter of described rods is 0.85 times of footpath at the bottom of the described piston connecting thread, and length is identical with piston length.
4. flexible piston rod according to claim 1 is characterized in that: be provided with crosshead screw thread changeover portion between described crosshead connecting thread and seal shaft.
5. flexible piston rod according to claim 1 is characterized in that: described piston connecting thread and crosshead connecting thread can be screw threads, also can be flanges.
6. flexible piston rod according to claim 1 is characterized in that: the diameter of described piston thread changeover portion is 0.8 times of the core diameter of thread, and length is 20～30 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058244 CN101476558A (en) | 2009-01-22 | 2009-01-22 | Flexible piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058244 CN101476558A (en) | 2009-01-22 | 2009-01-22 | Flexible piston rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101476558A true CN101476558A (en) | 2009-07-08 |
Family
ID=40837321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910058244 Pending CN101476558A (en) | 2009-01-22 | 2009-01-22 | Flexible piston rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101476558A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105264275A (en) * | 2013-03-15 | 2016-01-20 | S.P.M.流量控制股份有限公司 | Reciprocating pump assembly |
| USD791192S1 (en) | 2014-07-25 | 2017-07-04 | S.P.M. Flow Control, Inc. | Power end frame segment |
| USD791193S1 (en) | 2015-07-24 | 2017-07-04 | S.P.M. Flow Control, Inc. | Power end frame segment |
| US10352321B2 (en) | 2014-12-22 | 2019-07-16 | S.P.M. Flow Control, Inc. | Reciprocating pump with dual circuit power end lubrication system |
| US10436766B1 (en) | 2015-10-12 | 2019-10-08 | S.P.M. Flow Control, Inc. | Monitoring lubricant in hydraulic fracturing pump system |
-
2009
- 2009-01-22 CN CN 200910058244 patent/CN101476558A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9695812B2 (en) | 2013-03-15 | 2017-07-04 | S.P.M. Flow Control, Inc. | Reciprocating pump assembly |
| CN105264275A (en) * | 2013-03-15 | 2016-01-20 | S.P.M.流量控制股份有限公司 | Reciprocating pump assembly |
| CN105264275B (en) * | 2013-03-15 | 2017-07-21 | S.P.M.流量控制股份有限公司 | Reciprocating pump component |
| US10393182B2 (en) | 2014-07-25 | 2019-08-27 | S.P.M. Flow Control, Inc. | Power end frame assembly for reciprocating pump |
| US10520037B2 (en) | 2014-07-25 | 2019-12-31 | S.P.M. Flow Control, Inc. | Support for reciprocating pump |
| US9879659B2 (en) | 2014-07-25 | 2018-01-30 | S.P.M. Flow Control, Inc. | Support for reciprocating pump |
| US10087992B2 (en) | 2014-07-25 | 2018-10-02 | S.P.M. Flow Control, Inc. | Bearing system for reciprocating pump and method of assembly |
| US11898553B2 (en) | 2014-07-25 | 2024-02-13 | Spm Oil & Gas Inc. | Power end frame assembly for reciprocating pump |
| USD791192S1 (en) | 2014-07-25 | 2017-07-04 | S.P.M. Flow Control, Inc. | Power end frame segment |
| US11746775B2 (en) | 2014-07-25 | 2023-09-05 | Spm Oil & Gas Inc. | Bearing system for reciprocating pump and method of assembly |
| US11204030B2 (en) | 2014-07-25 | 2021-12-21 | Spm Oil & Gas Inc. | Support for reciprocating pump |
| US10677244B2 (en) | 2014-07-25 | 2020-06-09 | S.P.M. Flow Control, Inc. | System and method for reinforcing reciprocating pump |
| US10352321B2 (en) | 2014-12-22 | 2019-07-16 | S.P.M. Flow Control, Inc. | Reciprocating pump with dual circuit power end lubrication system |
| US11421682B2 (en) | 2014-12-22 | 2022-08-23 | Spm Oil & Gas Inc. | Reciprocating pump with dual circuit power end lubrication system |
| USD870157S1 (en) | 2015-07-24 | 2019-12-17 | S.P.M. Flow Control, Inc. | Power end frame segment |
| USD870156S1 (en) | 2015-07-24 | 2019-12-17 | S.P.M. Flow Control, Inc. | Power end frame segment |
| USD791193S1 (en) | 2015-07-24 | 2017-07-04 | S.P.M. Flow Control, Inc. | Power end frame segment |
| US10436766B1 (en) | 2015-10-12 | 2019-10-08 | S.P.M. Flow Control, Inc. | Monitoring lubricant in hydraulic fracturing pump system |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090708 |