CN212250389U - Ultralow-temperature high-pressure plunger pump - Google Patents
Ultralow-temperature high-pressure plunger pump Download PDFInfo
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- CN212250389U CN212250389U CN202020899821.4U CN202020899821U CN212250389U CN 212250389 U CN212250389 U CN 212250389U CN 202020899821 U CN202020899821 U CN 202020899821U CN 212250389 U CN212250389 U CN 212250389U
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Abstract
The utility model provides an ultra-low temperature high pressure plunger pump, including power end assembly and cold junction assembly, the power end assembly includes crankcase assembly, cross head casing assembly and lubricating system, the cold junction assembly includes casing, plunger, cylinder liner, high-low pressure valves, discharge flange, pressure cap, disk seat and seal assembly, the design has the ring cavity between cylinder liner and the casing in the cold junction assembly, is provided with back liquid mouth above the casing, the casing still is provided with inlet and discharge port, and power transmits the cold junction assembly through crankcase assembly, cross head casing assembly in proper order. The utility model discloses compact structure, lubricated good and be applicable to work under high pressure, the high rotational speed.
Description
Technical Field
The utility model relates to a field, concretely relates to ultra-low temperature high pressure plunger pump
Background
In recent years, as the fracturing process is mature in oil field application, the application of high-pressure nitrogen is increasing. The common air separation nitrogen making equipment is limited by the capacity of an air compressor, compressed nitrogen directly generated can only generate the highest discharge pressure of 35MPa, and the purity of the separated nitrogen is not high enough, so that the requirement of oil field fracturing on high pressure is difficult to meet, and how to generate high-pressure nitrogen becomes a difficult problem. Because low-temperature liquid nitrogen is very sensitive to temperature and has a boiling point of only-196 ℃, the injection device of the traditional medium, such as a slurry pump for oil field drilling, a well cementation pump for conventional well cementation and a fracturing pump for fracturing, cannot realize the transportation of ultra-low-temperature high-pressure liquid nitrogen, firstly, the material of parts of the conventional plunger pump contacting with the medium cannot meet the requirement of ultra-low temperature, and secondly, the plunger pump with the common structure is easy to transfer heat generated by friction of a power end into pumped liquid nitrogen during working so as to gasify the liquid nitrogen, and further, the plunger pump cannot normally work.
At present, some low-temperature plunger pumps for conveying liquid nitrogen in the prior art cannot ensure long-time operation of a power end transmission mechanism in the aspects of stress and lubrication due to the fact that working condition pressure and rotating speed are continuously increased (the pressure can reach 100MPa, and the rotating speed can reach 1000 rpm). In addition, the conventional plunger pump cannot meet the pumping requirements of the ultralow temperature medium, namely liquid nitrogen, under the high-pressure working condition in the aspects of sealing and low temperature.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's weak point, provide a compact structure, lubricated good and be applicable to ultra-low temperature high pressure plunger pump under high pressure, the high rotational speed.
The purpose of the utility model is achieved through the following technical measures:
an ultralow-temperature high-pressure plunger pump comprises a power end assembly and a cold end assembly, wherein the power end assembly provides power for liquid nitrogen compression, the cold end assembly is located at the liquid nitrogen compression position and comprises a crankcase assembly, a crosshead shell assembly and a lubricating system, the cold end assembly comprises a shell, a plunger, a cylinder sleeve, a high-pressure and low-pressure valve bank, a discharge flange, a pressure cap, a valve seat and a sealing assembly, an annular cavity is designed between the cylinder sleeve and the shell in the cold end assembly, a liquid return port is formed in the shell, the shell is also provided with a liquid inlet and a discharge port, power is transmitted through the crankcase assembly and the crosshead shell assembly in sequence to drive the plunger to do reciprocating linear motion, after the work is started, the plunger moves towards one direction, the high-pressure valve is closed, the low-pressure valve is opened; after the plunger moves towards the opposite direction, the low-pressure valve is closed, the high-pressure valve is opened under the condition that the pressure of the inner cavity is continuously increased, and low-pressure liquid nitrogen enters the high-pressure sealing cavity through the through hole in the center of the valve seat and flows out from the discharge port on the discharge flange.
Furthermore, the crankcase body assembly comprises a crankcase shell, a straight shaft, an eccentric wheel, a crankshaft bearing and a connecting rod, power is transmitted to the crosshead shell assembly through the straight shaft, the eccentric wheel and the connecting rod in sequence, the straight shaft is connected with the eccentric wheel through a flat key, and the connecting rod is installed on the straight shaft and the eccentric wheel.
Further, the straight shaft and the eccentric wheels are connected together through a flat key.
Furthermore, the crosshead shell assembly comprises a crosshead shell, a crosshead sliding sleeve, a crosshead and a crosshead pin shaft, wherein the crosshead is installed in the crosshead sliding sleeve and is connected with the connecting rod through the crosshead pin shaft.
Furthermore, lubricating oil holes are formed in the straight shaft, the eccentric wheel and the crosshead sliding sleeve and are respectively subjected to forced lubrication through a main oil pipe and a branch oil pipe in a lubricating system, and an oil return port is reserved below the crankcase shell.
Further, the plunger is provided with a plurality of grooves.
Furthermore, the discharge flange and the valve seat as well as the valve seat and the cylinder sleeve are sealed by a waterline, so that metal sealing at ultralow temperature is realized.
Furthermore, all spare parts of power end assembly and cold junction assembly adapting unit and cold junction assembly all adopt low temperature resistant metal material, and cold junction assembly seal assembly all adopts ultra-low temperature non-metallic material.
Furthermore, the high-pressure and low-pressure valve group and the valve seat in the cold end assembly are sealed in a plane metal sealing mode.
Furthermore, a high-pressure valve spring and a low-pressure valve spring which are matched with the high-pressure valve and the low-pressure valve for use are respectively arranged on the high-pressure valve group and the low-pressure valve group and used for quickly returning the high-pressure valve and the low-pressure valve after the high-pressure valve and the low-pressure valve are opened.
Since the technical scheme is used, the utility model has the advantages that:
the utility model is composed of a power end assembly and a cold end assembly, wherein each cylinder of the cold end assembly is designed into a single piece type, which can be processed and assembled separately, and is more convenient for disassembly and maintenance compared with an integral cold end; the shell of the crankcase adopts a welding structure, and comprises a case cover and an upper part and a lower part of the case body, and compared with a casting forming structure, the welding structure is simple and quick, and the design and production period is shorter;
the crankshaft adopts a split structure that a straight shaft and a plurality of eccentric wheels are connected together through flat keys, so that the difficulty of integral processing of the crankshaft is effectively reduced, and the design mode is convenient to disassemble and assemble;
the integral connecting rod structure is adopted, and the integral connecting rod structure can be directly arranged on the straight shaft and the eccentric wheel, so that the strength of the whole pump under high-speed operation is improved;
lubricating oil holes are formed in the straight shaft, the eccentric wheel and the crosshead sliding sleeve and are respectively subjected to forced lubrication through a main oil pipe and a branch oil pipe in a lubricating system, lubricating oil holes are formed in two sides of the eccentric wheel respectively, and lubricating oil can be sprayed onto a crankshaft bearing through the lubricating oil holes in the two sides of the eccentric wheel under the forced lubrication to lubricate the bearing, so that the problem of plunger pump lubrication under high pressure and high rotating speed is solved;
the high-low pressure valve and the valve seat in the cold end assembly are sealed by adopting plane metal, and the high-low pressure valve is continuously opened and closed, so that low-pressure liquid nitrogen is converted into high-pressure liquid nitrogen and discharged, the requirement of frequent opening and closing at high rotating speed can be met, and the problem that an ordinary plunger pump cannot pump ultralow-temperature high-pressure liquid nitrogen is solved;
an annular cavity is designed between a cylinder sleeve and a shell in the cold end assembly, a liquid return port is arranged on the shell, and liquid nitrogen in the part of communication area can absorb heat generated in the reciprocating motion process of the plunger and is discharged along with the liquid nitrogen through the liquid return port on the shell to play a role in heat dissipation, so that the liquid nitrogen in the high-pressure cavity and the low-pressure cavity is protected from absorbing heat and gasifying, and the pumping efficiency is improved;
be provided with the multichannel recess above the plunger, the recess has two effects: the plunger piston is used for mounting a support ring and a sealing piece to ensure the stability of the plunger piston under high-speed operation; the liquid nitrogen can be stored, and can play a role in lubricating the plunger which runs at a high speed, so that the service life of cold-end parts is prolonged;
the discharge flange and the valve seat as well as the valve seat and the cylinder sleeve adopt a waterline sealing design, so that metal sealing at ultralow temperature is realized;
all parts of the connecting component of the power end assembly and the cold end assembly and all parts of the cold end assembly are made of low-temperature-resistant metal materials, and the sealing component of the cold end assembly is made of ultralow-temperature (-196 ℃) non-metal materials, so that the reliability under the ultralow-temperature working environment is ensured;
the operation requirements of the existing liquid nitrogen pump at high pressure, high rotating speed and the like of fracturing accompanied injection, gas lift and the like are met.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic structural view of an ultra-low temperature high-pressure plunger pump of the present invention;
FIG. 2 is a schematic structural view of a power end assembly of the present invention;
fig. 3 is a schematic structural diagram of the middle cold end assembly of the present invention.
100, a power end assembly; 110. a crankcase assembly 111, a crankcase housing; 112. a straight shaft; 113. an eccentric wheel; 114. a crankshaft bearing; 115. a connecting rod; 116. a flat bond; 117. bearing blocks 120, crosshead case assemblies; 121. a crosshead housing; 122. a crosshead sliding sleeve; 123. a crosshead; 124. a crosshead pin shaft; 130. a lubrication system; 131. a main oil pipe; 132. an oil pipe is branched; 133. an oil return port; 200 cold end assembly; 201. a housing; 202. a plunger; 203. a cylinder liner; 204. a discharge flange; 205. pressing the cap; 206. A seal assembly; 207. a liquid inlet; 208. a liquid return port; 209. a packing seal assembly; 210. a low pressure valve; 211. a low pressure sealed cavity; 212. a valve seat; 213. a high pressure valve; 214. a high pressure sealed cavity; 215. a high pressure valve spring; 216. a low pressure valve spring; 217. a ring cavity; 218. and (7) discharging the air.
Detailed Description
As shown in fig. 1-3, an ultra-low temperature high pressure plunger pump comprises a power end assembly 100 and a cold end assembly 200. Wherein the power end assembly includes a crankcase assembly 110, a crosshead housing assembly 120, and a lubrication system 130. The crankcase assembly 110 includes a crankcase housing 111, a straight shaft 112, an eccentric 113, a crankshaft bearing 114, a bearing block 117, and a connecting rod 115; the crankshaft is split, a straight shaft 112 and three eccentric wheels 113 are connected together through a flat key 116, a flat key groove is formed in the large end of the straight shaft 112, and external power is transmitted through the flat key 116; the connecting rod 115 is of a unitary construction and the eccentric 113 is connected to a crosshead 123 in the crosshead housing assembly 120 via the connecting rod 115. The number of the crosshead housing assemblies 120 is three, each assembly including a crosshead housing 121, a crosshead shoe 122, a crosshead 123 and a crosshead pin 124, the crosshead 123 being mounted within the crosshead shoe 122 and connected to the connecting rod 115 by the crosshead pin 124. Lubricating oil holes are formed in the straight shaft 112, the eccentric wheel 113 and the crosshead shoe 122, and are forcibly lubricated by a main oil pipe 131 and a branch oil pipe 132 in a lubricating system 130, respectively, leaving an oil return port 133 below the crankcase housing 111. The cold end assembly 200 comprises a shell 201, a plunger 202, a cylinder sleeve 203, a high-pressure and low-pressure valve group, a discharge flange 204, a pressure cap 205 and a sealing component 206; a liquid inlet 207 and a liquid return port 208 are arranged in the circumferential direction of the shell 201, a threaded connection device is arranged at the front end and used for being connected with the power end assembly 100, a plurality of packing sealing assemblies 209 are arranged at the left end to prevent liquid nitrogen from leaking from the front end, and a low-pressure sealing cavity 211 is formed at the right end, the cylinder sleeve 203 and the low-pressure valve 210; the center of the valve seat 212 is provided with a through hole, the end surfaces of two ends are metal sealing surfaces and respectively form sealing with the high-pressure valve 213 and the low-pressure valve 210, the outer side of the high-pressure valve 213 is provided with a discharge flange 204 and a pressure cap 205, wherein the high-pressure valve 213, the valve seat 212 and the discharge flange 204 form a high-pressure sealing cavity 214; sealing waterlines are arranged on the cylinder sleeve 203, the valve seat 212 and the discharge flange 204, and the sealing of liquid nitrogen is realized through the sealing gasket and the sealing waterlines; a high-pressure valve spring 215 and a low-pressure valve spring 216 are respectively arranged above the high-pressure valve 213 and the low-pressure valve 210, and are used for quick return of the high-pressure valve and the low-pressure valve after opening. Through the continuous opening and closing of the high-pressure valve and the low-pressure valve, the low-pressure liquid nitrogen is converted into high-pressure liquid nitrogen and discharged, the requirement of frequent opening and closing at a high rotating speed can be met, and the problem that an ordinary plunger pump cannot pump ultralow-temperature high-pressure liquid nitrogen is solved.
Lubricating oil holes are designed in the straight shaft 112, the eccentric wheel 113 and the crosshead sliding sleeve 122 and are respectively subjected to forced lubrication through a main oil pipe 131 and a branch oil pipe 132 in a lubricating system 130, lubricating oil holes are respectively designed in two sides of the eccentric wheel 113, and lubricating oil under forced lubrication can be sprayed onto the crankshaft bearing 114 through the lubricating oil holes in the two sides of the eccentric wheel 113 to lubricate the bearing, so that the problem of plunger pump lubrication under high pressure and high rotating speed is solved.
A ring cavity 217 is designed between the cylinder sleeve 203 and the shell 201 in the cold end assembly 200, a liquid return port 208 is arranged on the shell 201, liquid nitrogen in the communication area can absorb heat generated in the reciprocating motion process of the plunger 202, and is discharged along with the liquid nitrogen through the liquid return port 208, so that the heat dissipation effect is achieved, the liquid nitrogen in the high-pressure cavity and the low-pressure cavity is protected from heat absorption and gasification, and the pumping efficiency is improved.
All parts of the connecting component of the power end assembly 100 and the cold end assembly 200 are made of low-temperature-resistant metal materials, and the sealing component 206 of the cold end assembly 200 is made of ultralow-temperature (-196 ℃) non-metal materials, so that the reliability under the ultralow-temperature working environment is ensured.
When the whole pump works, power is transmitted to the connecting rod 115 through the flat key 116 on the straight shaft 112, the plunger 202 is driven to do reciprocating linear motion through the crosshead 123, and in the motion process of the plunger 202, low-pressure liquid nitrogen is converted into high-pressure liquid nitrogen through continuous opening and closing of the high-low pressure valve and is discharged. In the precooling process, liquid nitrogen enters an annular cavity 217 formed between the cylinder sleeve 203 and the shell 201 from a liquid inlet 207 on the lower surface of the shell 201 to cool the pump, and flows back to the liquid storage tank from a liquid return port 208 on the upper surface of the shell 201; in the working process, when the plunger 202 moves leftwards, the high-pressure valve 213 is closed, the low-pressure valve 210 is opened, and liquid nitrogen enters the low-pressure sealing cavity 211 from the liquid inlet 207; when the plunger 202 moves to the right, the low pressure valve 210 is closed by the low pressure valve spring 216, the high pressure valve 213 is opened under the condition of increasing pressure in the inner cavity, and low pressure liquid nitrogen enters the high pressure seal cavity 214 through the central through hole of the valve seat 212 and flows out of the discharge port 218 on the discharge flange 204.
Claims (10)
1. The utility model provides an ultra-low temperature high pressure plunger pump which characterized in that: the power end assembly comprises a crankcase assembly, a crosshead shell assembly and a lubricating system, the cold end assembly comprises a shell, a plunger, a cylinder sleeve, a high-pressure valve bank, a low-pressure valve bank, a discharge flange, a pressure cap, a valve seat and a sealing assembly, an annular cavity is designed between the cylinder sleeve and the shell in the cold end assembly, a liquid return port is formed in the shell, a liquid inlet and a discharge port are formed in the shell, power is transmitted through the crankcase assembly and the crosshead shell assembly in sequence to drive the plunger to do reciprocating linear motion, after the work is started, the plunger moves towards one direction, the high-pressure valve is closed, the low-pressure valve is opened, and liquid nitrogen enters the low-pressure sealing cavity from the liquid inlet; after the plunger moves towards the opposite direction, the low-pressure valve is closed, the high-pressure valve is opened under the condition that the pressure of the inner cavity is continuously increased, and low-pressure liquid nitrogen enters the high-pressure sealing cavity through the through hole in the center of the valve seat and flows out from the discharge port on the discharge flange.
2. An ultra-low temperature high pressure plunger pump according to claim 1, characterized in that: the crankcase assembly comprises a crankcase shell, a straight shaft, an eccentric wheel, a crankshaft bearing and a connecting rod, power is transmitted to the crosshead shell assembly through the straight shaft, the eccentric wheel and the connecting rod in sequence, the straight shaft is connected with the eccentric wheel through a flat key, and the connecting rod is installed on the straight shaft and the eccentric wheel.
3. An ultra-low temperature high pressure plunger pump according to claim 2, characterized in that: the straight shaft is connected with a plurality of eccentric wheels through flat keys.
4. An ultra-low temperature high pressure plunger pump according to claim 2, characterized in that: the crosshead shell assembly comprises a crosshead shell, a crosshead sliding sleeve, a crosshead and a crosshead pin shaft, wherein the crosshead is installed in the crosshead sliding sleeve and is connected with the connecting rod through the crosshead pin shaft.
5. An ultra-low temperature high pressure plunger pump according to claim 4, characterized in that: lubricating oil holes are formed in the straight shaft, the eccentric wheel and the crosshead sliding sleeve and are respectively subjected to forced lubrication through a main oil pipe and a branch oil pipe in a lubricating system, and an oil return port is reserved below the crankcase shell.
6. An ultra-low temperature high pressure plunger pump according to claim 1, characterized in that: the plunger is provided with a plurality of grooves.
7. An ultra-low temperature high pressure plunger pump according to claim 1, characterized in that: and the discharge flange and the valve seat as well as the valve seat and the cylinder sleeve are sealed by a waterline, so that metal sealing at ultralow temperature is realized.
8. An ultra-low temperature high pressure plunger pump according to claim 2, characterized in that: all spare parts of power end assembly and cold end assembly adapting unit and cold end assembly all adopt resistant low temperature metal material, and cold end assembly seal assembly all adopts ultra-low temperature non-metallic material.
9. An ultra-low temperature high pressure plunger pump according to claim 2, characterized in that: and the high-pressure and low-pressure valve group and the valve seat in the cold end assembly are sealed in a plane metal sealing mode.
10. An ultra-low temperature high pressure plunger pump according to claim 1, characterized in that: and the high-pressure valve group and the low-pressure valve group are respectively provided with a high-pressure valve spring and a low-pressure valve spring which are matched with the high-pressure valve and the low-pressure valve for use, and the high-pressure valve and the low-pressure valve can be quickly returned after being opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020899821.4U CN212250389U (en) | 2020-05-26 | 2020-05-26 | Ultralow-temperature high-pressure plunger pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020899821.4U CN212250389U (en) | 2020-05-26 | 2020-05-26 | Ultralow-temperature high-pressure plunger pump |
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| CN212250389U true CN212250389U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020899821.4U Active CN212250389U (en) | 2020-05-26 | 2020-05-26 | Ultralow-temperature high-pressure plunger pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022116779A1 (en) * | 2020-12-01 | 2022-06-09 | 烟台杰瑞石油装备技术有限公司 | Lubricating system for plunger pump and plunger pump |
| CN117605673A (en) * | 2023-12-07 | 2024-02-27 | 阿奥艾斯能源科技成都有限公司 | Horizontal multi-cylinder plunger type feeding pump for residual oil hydrogen production |
-
2020
- 2020-05-26 CN CN202020899821.4U patent/CN212250389U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022116779A1 (en) * | 2020-12-01 | 2022-06-09 | 烟台杰瑞石油装备技术有限公司 | Lubricating system for plunger pump and plunger pump |
| CN117605673A (en) * | 2023-12-07 | 2024-02-27 | 阿奥艾斯能源科技成都有限公司 | Horizontal multi-cylinder plunger type feeding pump for residual oil hydrogen production |
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