CN202165236U - Plunger pump for pumping ultra-low temperature liquid nitrogen - Google Patents

Plunger pump for pumping ultra-low temperature liquid nitrogen Download PDF

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Publication number
CN202165236U
CN202165236U CN 201120257784 CN201120257784U CN202165236U CN 202165236 U CN202165236 U CN 202165236U CN 201120257784 CN201120257784 CN 201120257784 CN 201120257784 U CN201120257784 U CN 201120257784U CN 202165236 U CN202165236 U CN 202165236U
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CN
China
Prior art keywords
liquid nitrogen
plunger
inner chamber
cold junction
pressure valve
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Expired - Fee Related
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CN 201120257784
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Chinese (zh)
Inventor
林辉
潘加东
张君峰
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Yantai Jereh Petroleum Equipment and Technologies Co Ltd
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Yantai Jereh Petroleum Equipment and Technologies Co Ltd
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Publication of CN202165236U publication Critical patent/CN202165236U/en
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Abstract

The utility model relates to a plunger pump for pumping ultra-low temperature liquid nitrogen, which comprises a power end and a cold end. The cold end comprises a cold end casing, one end of the cold end casing is provided with a plunger, and the other end of the cold end casing is provided with a suction inlet and a discharge outlet. A valve seat is respectively arranged at the positions of the suction inlet and the discharge outlet of the cold end casing, one end of the plunger is connected with the power end, and the other end of the plunger is matched with the cold end casing and the valve seats to form an inner cavity. Each valve seat is provided with a first channel for communicating the inner cavity and the suction inlet and a second channel for communicating the inner cavity and the discharge outlet. A low pressure valve for controlling the liquid nitrogen to be sucked into the inner cavity is arranged between the first channel and the inner cavity, a high pressure valve for controlling the liquid nitrogen to be discharged out of the inner cavity is arranged in the second channel. The plunger is driven by the power end to perform linear reciprocating motion in the inner cavity and further drives the low pressure valve and the high pressure valve to open or close. When the low pressure valve is opened, the liquid nitrogen enters the inner cavity from the suction inlet, and when the high pressure valve is opened, the liquid nitrogen is discharged out of the inner cavity from the discharge outlet. The cold end casing is provided with an overflow port which is communicated with the inner cavity.

Description

A kind of plunger pump that is used for pumping ultralow temperature liquid nitrogen
Technical field
The utility model relates to a kind of plunger pump that is used for pumping ultralow temperature liquid nitrogen, belongs to the liquid nitrogen pump apparatus field of oil field construction.
Background technique
In recent years, along with the continuous maturation of fracturing technology on field use, the utilization of high pressure nitrogen is more and more, and the nitrogen that how to produce high pressure becomes a difficult problem.The compressed nitrogen that common nitrogen production by air separation equipment directly produces can only produce the head pressure of the highest 35MPa, is difficult to satisfy the requirement of oil field compression fracture.The liquid nitrogen plunger pump adds the low pressure liquid nitrogen and is pressed into high-pressure liquid nitrogen; Utilize heat exchange that the mode that high-pressure liquid nitrogen converts high pressure nitrogen to is discharged again; This method can successfully obtain the above nitrogen head pressure of 100MPa; Satisfy the pressure requirement of fracturing work fully, therefore, applications such as annotating acidifying, nitrogen gaslift, oil field pressure testing are mixed and annotate pressure break, mixed to the liquid nitrogen plunger pump in the oil field extensive.But; Because liquid nitrogen is a kind of liquid of ultralow temperature; Boiling point is at-196 degrees centigrade; Very responsive to temperature, so easily thereby the fricative heat transfer of power end is caused liquid nitrogen vaporization in the liquid nitrogen of pumping during the work of the liquid nitrogen plunger pump of ordinary construction, thus cause the plunger pump can't proper functioning.
The model utility content
In order to solve in the existing technology liquid nitrogen pump in pumping liquid nitrogen process, absorb heat the easily problem of vaporization of liquid nitrogen, the utility model provides a kind of plunger pump that is used for pumping ultralow temperature liquid nitrogen.
The technological scheme that the utility model solves the problems of the technologies described above is following: a kind of plunger pump that is used for pumping ultralow temperature liquid nitrogen, and it comprises power end and cold junction, said cold junction comprises the cold junction housing; Said cold junction housing one end is equipped with plunger, and the other end is provided with suction port and exhaust port, is provided with valve seat at the suction port and the exhaust port place of said cold junction housing; Said plunger one end is connected with said power end; The other end and cold junction housing, valve seat complement each other to form inner chamber, and said valve seat is provided with and is used to the second channel that is communicated with the first passage of said inner chamber and said suction port and is used to be communicated with said inner chamber and said exhaust port, between said first passage and inner chamber, are provided with to be used to control the low pressure valve that liquid nitrogen sucks inner chamber; In said second channel, be provided for controlling the high pressure valve that liquid nitrogen is discharged inner chamber; Said plunger is done straight reciprocating motion in said inner chamber under said power end drives, and then drive said low pressure valve or the switching of said high pressure valve, when low pressure valve is opened; Make liquid nitrogen get into inner chamber from suction port; When high pressure valve was opened, liquid nitrogen was discharged inner chamber from exhaust port, and said cold junction housing is provided with the flow-off that communicates with said inner chamber.
Further; Connecting rod that said power end comprises the power end housing, be installed in said power end enclosure interior and the bent axle that is connected with power system, be in transmission connection with said bent axle and the crosshead pull bar that is in transmission connection through said connecting rod and said bent axle, said crosshead pull bar is connected with the plunger of said cold junction.
Further, said crosshead pull bar and said plunger link together through slips.
Further, said power end housing is provided with pneumostome.
Further, said power end housing and said cold junction housing link together through transitional shell.
The beneficial effect of the utility model is: the plunger pump that the utility model is used for pumping ultralow temperature liquid nitrogen solves the existing technology liquid nitrogen pump in pumping liquid nitrogen process; The problem that liquid nitrogen absorbs heat easily and vaporizes; Adopt special mode that power end and cold junction are coupled together; The heat transfer that has significantly reduced power end is among liquid nitrogen; Simultaneously, liquid nitrogen pump has adopted a kind of cold junction through particular design to be used for the suction of low pressure liquid nitrogen and the discharge work of high-pressure liquid nitrogen, can apply in the oil pressure pressure break corollary equipment liquid nitrogen car.
Description of drawings
Fig. 1 is used for the structural representation of the plunger pump of pumping ultralow temperature liquid nitrogen for the utility model;
Fig. 2 is the plan view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the principle and the characteristic of the utility model are described, institute gives an actual example and only is used to explain the utility model, is not the scope that is used to limit the utility model.
As depicted in figs. 1 and 2, a kind of plunger pump that is used for pumping ultralow temperature liquid nitrogen mainly is made up of cold junction 2 and power end two-part.Power end mainly is used for converting rotatablely moving of passing over of motor into linear reciprocating motion.Cold junction 2 is the core component of liquid nitrogen pump, and professional structural design has been carried out in its inside, and main effect is to realize that the low pressure of liquid nitrogen sucks and high pressure is discharged.
Connecting rod 13 that power end comprises power end housing 11, be installed in the inner bent axle 12 of power end housing 11, be in transmission connection with bent axle 12 and the crosshead pull bar 14 that is in transmission connection through connecting rod 13 and bent axle 12; Power end housing 11 is provided with pneumostome 10; Connect input flange 15 on the bent axle 12; And be connected with power system through input flange 15, power end housing 11 internal chamber walls are provided with the slide rail 16 that is connected with crosshead link 14.
Cold junction 2 comprises cold junction housing 21; An end is equipped with plunger 22 in the cold junction housing 21; The other end is provided with suction port 23 and exhaust port 24; Suction port 23 at cold junction housing 21 is provided with valve seat 25 with exhaust port 24 places, and the crosshead pull bar 14 of plunger 22 1 ends and power end links together through slips 28, and the other end and cold junction housing 21, valve seat 25 complement each other to form inner chamber 20; Valve seat 25 is provided with the first passage 251 that is used for communication with cavity 20 and suction port 23 and is used for communication with cavity 20 and the second channel 252 of exhaust port 24; Between first passage 251 and inner chamber 20, be provided with the low pressure valve 26 that is used to control liquid nitrogen suction inner chamber 20, in second channel 252, be provided for controlling the high pressure valve 27 that liquid nitrogen is discharged inner chamber 20, link together through transition shell 30 between power end shell 11 and the cold junction shell 21.Cold junction housing 21 is provided with the flow-off 28 that communicates with inner chamber 20.
Power system drives input flange 15 rotations; And then drive bent axle 12 and rotate, because bent axle 12 is designed to eccentric structure, under the drive of connecting rod 13; Crosshead link 14 can be done straight reciprocating motion along this slide rail 16; Crosshead link 14 drives plunger 22 and in inner chamber 20, does straight reciprocating motion, cooperates realization inner chamber 20 suction low pressure liquid nitrogen down with valve seat 25 at low pressure valve 26, under high pressure valve 27 and valve seat 25 cooperate, realizes inner chamber 20 discharge high-pressure liquid nitrogens.
The utility model is used for liquid nitrogen that the plunger pump of pumping ultralow temperature liquid nitrogen can be through pumping and the plunger 22 of cold junction 2 is lubricated and cools off and need not adopt lubricant oil; Thereby the liquid nitrogen that is used for lubricating flows back to liquid nitrogen container from cold junction 2 flow-offs 28 plunger 22 runnings is dissipated owing to fricative heat, has prolonged the working life of cold junction 2.
The plunger pump groundwork process that the utility model is used for pumping ultralow temperature liquid nitrogen is: the rotating power of coming from the power systems communicate is input to this plunger pump through input flange 15, and input flange 15 and then driving bent axle 12 rotate.Because bent axle 12 is designed to eccentric structure, rotatablely moving of bent axle 12 is transformed into the linear reciprocating motion of crosshead pull bar 14 under the acting in conjunction of connecting rod 13, crosshead pull bar 14 and slide rail 16.Utilize to connect slips 31 plunger 22 of crosshead pull bar 14 and cold junction 2 is connected together, thereby drive plunger 22 is being carried out linear reciprocating motion and sucked and discharging liquid nitrogen.
When plunger 22 during to left movement; Low pressure valve 26 also is moved to the left under the effect of Returnning spring 261, thereby separates with valve seat 25, and promptly low pressure valve 26 is an open mode; This moment, liquid nitrogen passed through to have accomplished the suction process of liquid nitrogen this moment in the inner chamber 20 between suction port 23 entering plungers 22 and the low pressure valve 26.When plunger 22 moved right, liquid nitrogen was compressed pressure and constantly raises, and active force that low pressure valve 26 overcomes Returnning spring 261 is overlapped with the sealing surface of valve seat 25, and promptly low pressure valve 26 is a closed condition, has prevented the refluence of liquid nitrogen.Spring 271 active forces that surpass high pressure valve 27 when liquid nitrogen pressure are done the time spent; High pressure valve 27 produces with valve seat 25 sealing surfaces and separates; Be that high pressure valve 27 is opened, the high-pressure liquid nitrogen that plunger 22 is compressed into can flow out plunger pump through exhaust port 24, has accomplished the discharge process of liquid nitrogen this moment.A part of liquid nitrogen slit between plunger 22 and the cold junction housing 21 of can flowing through in the entire work process; Turn back in the liquid nitrogen container through flow-off 28 and to utilize again or directly be discharged in the air; Thereby fricative heat in the plunger 22 to-and-fro motion processes is dissipated, play effect lubricated and cooling.
This plunger pump is equipped with three fully independently cold junctions 2, adopts the mode that is threaded to be connected with transitional shell 30, and installation, replacing and maintenance repair are all very convenient, and are easy to observe the frosting situation of cold junction 2.Under the situation that one of them cold junction 2 of this plunger pump damages, other cold junctions 2 still can proper functioning.
The liquid nitrogen pump power end of ordinary construction and fluid end normally are installed together, and the high temperature that power end produces during this pump work can be directly delivered in the pumped medium and go.The crosshead pull bar 14 that the utility model is used for the plunger pump of pumping ultralow temperature liquid nitrogen does not directly contact with plunger 22, but is connected to together through connecting slips 31, has avoided the high temperature of power end to be delivered to the vaporization that causes liquid nitrogen in the cold junction 2.
The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection domain of the utility model.

Claims (5)

1. plunger pump that is used for pumping ultralow temperature liquid nitrogen, it is characterized in that: it comprises power end and cold junction, said cold junction comprises the cold junction housing; Said cold junction housing one end is equipped with plunger, and the other end is provided with suction port and exhaust port, is provided with valve seat at the suction port and the exhaust port place of said cold junction housing; Said plunger one end is connected with said power end; The other end and cold junction housing, valve seat complement each other to form inner chamber, and said valve seat is provided with and is used to the second channel that is communicated with the first passage of said inner chamber and said suction port and is used to be communicated with said inner chamber and said exhaust port, between said first passage and inner chamber, are provided with to be used to control the low pressure valve that liquid nitrogen sucks inner chamber; In said second channel, be provided for controlling the high pressure valve that liquid nitrogen is discharged inner chamber; Said plunger is done straight reciprocating motion in said inner chamber under said power end drives, and then drive said low pressure valve or the switching of said high pressure valve, when low pressure valve is opened; Make liquid nitrogen get into inner chamber from suction port; When high pressure valve was opened, liquid nitrogen was discharged inner chamber from exhaust port, and said cold junction housing is provided with the flow-off that communicates with said inner chamber.
2. the plunger pump that is used for pumping ultralow temperature liquid nitrogen according to claim 1; It is characterized in that: said power end comprises the power end housing, be installed in said power end enclosure interior and the bent axle that is connected with power system, the connecting rod that is in transmission connection with said bent axle and the crosshead pull bar that is in transmission connection through said connecting rod and said bent axle, and said crosshead pull bar is connected with the plunger of said cold junction.
3. the plunger pump that is used for pumping ultralow temperature liquid nitrogen according to claim 2 is characterized in that: said crosshead pull bar and said plunger link together through slips.
4. the plunger pump that is used for pumping ultralow temperature liquid nitrogen according to claim 2 is characterized in that: said power end housing is provided with pneumostome.
5. according to each described plunger pump that is used for pumping ultralow temperature liquid nitrogen of claim 2 to 4, it is characterized in that: said power end housing and said cold junction housing link together through transitional shell.
CN 201120257784 2011-07-21 2011-07-21 Plunger pump for pumping ultra-low temperature liquid nitrogen Expired - Fee Related CN202165236U (en)

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