CN108843531B - Plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media - Google Patents
Plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media Download PDFInfo
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- CN108843531B CN108843531B CN201811021107.9A CN201811021107A CN108843531B CN 108843531 B CN108843531 B CN 108843531B CN 201811021107 A CN201811021107 A CN 201811021107A CN 108843531 B CN108843531 B CN 108843531B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
- F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
- F04B2015/081—Liquefied gases
- F04B2015/0818—Carbon dioxide
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The utility model relates to a plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media, comprising: the pump body is internally provided with a plunger channel and a combined valve channel which are communicated with each other; the plunger is movably arranged in the plunger channel; the liquid inlet valve of the combined valve is arranged at the lower part of the combined valve channel, and the liquid outlet valve of the combined valve is arranged at the upper part of the combined valve channel; the plunger channel is horizontally arranged in the pump body, the combined valve channel is obliquely arranged from top to bottom and is positioned above the plunger channel, the liquid inlet valve and the liquid outlet valve are positioned on the same central line, the central line of the combined valve channel and the central line of the plunger channel are arranged in different planes, and a notch is formed in the side wall surface of the lower end of the combined valve channel and is communicated with the plunger channel. The hydraulic end of the plunger pump not only can effectively reduce the invalid volume of the plunger pump, but also can avoid the occurrence of the air lock problem, and greatly improves the working efficiency of the plunger pump.
Description
Technical Field
The utility model relates to the technical field of plunger pumps, in particular to a plunger pump hydraulic end for conveying liquid carbon dioxide and other gas-containing media.
Background
The plunger pump is a common power device for conveying gas-containing media such as liquid carbon dioxide, liquid nitrogen, liquefied gas and the like, for example, in the oil-displacement huff-puff process of an oil field or in the production of extracting essences of various animals and plants by utilizing carbon dioxide, the liquid carbon dioxide is required to be conveyed, and in the oil-displacement huff-puff process of the oil field, the input device is required to overcome the requirement of gasification under the influence of the physical characteristics of the liquid carbon dioxide and the specificity of the oil extraction process of injecting the liquid carbon dioxide.
The oil field oil displacement throughput process is to inject liquid carbon dioxide into the oil field according to different pressure levels in the well through a shielding pump at an inlet of a reciprocating plunger pump so as to achieve the throughput and oil displacement effect. The pressure of a medium source for storing liquid carbon dioxide is 2.4-2.6Mpa, the pressure of the medium source is increased by 0.5Mpa after the shielding pump enters the inlet of the plunger pump, because the plunger pump is a liquid conveying device, the liquid pump cannot enter air, once the plunger pump enters air, the air lock cannot work, and the conveying capability is lost, so that the plunger pump is ensured to convey in liquid state, carbon dioxide enters the inlet of the plunger pump to be in liquid state, in actual operation, the carbon dioxide is generally conveyed on a critical temperature line of gas and liquid, but the flow plunger pump is difficult to work in full liquid state, because the inlet pressure of the plunger pump is increased by 0.5Mpa by the shielding pump, when the pressure in the air source tank is reduced to 2.3Mpa, the liquid carbon dioxide is still in the gasification process even if the pressure is increased by 0.5Mpa, and the plunger pump cannot convey gaseous carbon dioxide, because the conveying characteristic requirement of the liquid carbon dioxide is too narrow, the efficiency of the plunger pump is very low in actual working condition, the air source waste is very large, and the air lock is easy to cause low production efficiency.
In order to solve the technical problem, the Chinese patent application No. CN98204169.1 (the issued publication No. CN 2348096Y) discloses a liquid carbon dioxide injection device which consists of a liquid carbon dioxide injection pump and a matched flow, wherein the injection pump comprises a liquid inlet valve and a liquid outlet valve, wherein the axes of the corresponding liquid inlet valve and the liquid outlet valve form 90 degrees to form an L-shaped pump head, the high part of the liquid inlet valve cavity is provided with a gas discharge plug and a valve rod, during injection, if airlock is found, the valve rod can be deflated through the bleeder plug. The utility model optimizes the structure of the hydraulic end of the injection pump, reduces the useless volume in the pump cavity to a certain extent, improves the effective volume utilization rate and solves the air lock problem.
However, in the practical use process, the liquid carbon dioxide injection device has a certain defect, firstly, the injection pump with the L-shaped structure is a three-way hydraulic end, the liquid inlet valve of the injection pump is operated in a horizontal mode, the liquid outlet valve of the injection pump is operated in a vertical mode, and due to the installation requirements and the stress requirements of the liquid inlet valve and the liquid outlet valve, the communication position between the valve port and the plunger cavity of the injection pump needs to leave enough space, so that the pump cavity of the injection pump has larger invalid volume inevitably, and the working efficiency of the injection pump is still not high; secondly, the gas-liquid separation effect of the injection pump with the structure is not obvious, that is, when the liquid inlet valve is opened, the gas-liquid exchange process of carbon dioxide is not rapid enough, and because the carbon dioxide gas can not be separated and discharged at the first time, a large amount of gas still stays in the plunger cavity when the liquid inlet valve is closed, so that the gas lock problem of the plunger pump still frequently occurs; in addition, the liquid carbon dioxide injection device with such a structure needs to frequently discharge carbon dioxide gas into the environment, which results in a very bad working environment for operators and also does not meet the current environmental protection requirements.
Therefore, the existing plunger pump fluid end needs to be further improved.
Disclosure of Invention
The utility model aims to solve the technical problem of the prior art, and provides the plunger pump hydraulic end for conveying liquid carbon dioxide and other gas-containing media, which has a novel structure, can effectively reduce the invalid volume in a pump cavity and improve the working efficiency.
The technical scheme adopted for solving the technical problems is as follows: a plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media, comprising: the pump body is internally provided with a plunger channel and a combined valve channel which are communicated with each other; the plunger is movably arranged in the plunger channel; the liquid inlet valve of the combined valve is arranged at the lower part of the combined valve channel, and the liquid outlet valve of the combined valve is arranged at the upper part of the combined valve channel; the plunger channel is horizontally arranged in the pump body, the combined valve channel is obliquely arranged from top to bottom and is positioned above the plunger channel, the liquid inlet valve and the liquid outlet valve are positioned on the same central line, the central line of the combined valve channel and the central line of the plunger channel are arranged in different planes, and a notch is formed in the side wall surface of the lower end of the combined valve channel and is communicated with the plunger channel.
Preferably, the central line of the combined valve channel is perpendicular to the central line of the plunger channel, and the notch is positioned on a side wall surface of a relatively lower position in the combined valve channel. By means of the structure, when the liquid inlet valve is opened, the conveyed gas-containing medium can be subjected to gas-liquid exchange rapidly, and gas can rapidly rise through the notch and enter the liquid inlet valve to be subjected to gas-liquid separation.
Preferably, a recovery device for recovering the gaseous medium is further arranged on the outer side of the pump body, a liquid inlet channel which is obliquely arranged from top to bottom is formed in the pump body, the upper end of the liquid inlet channel is communicated with the recovery device, the lower end of the liquid inlet channel is communicated with the combined valve channel, and the center line of the liquid inlet channel and the center line of the combined valve channel are arranged at an angle and form an oblique angle alpha. The liquid inlet flow channel is obliquely arranged from top to bottom, so that gas phase and liquid phase in the gas-containing medium can be separated conveniently, and the gas-containing medium can be quickly lifted to the recovery device.
Preferably, the liquid outlet valve and the liquid inlet valve share a valve seat and are respectively positioned at the upper end and the lower end of the valve seat, a liquid inlet cavity communicated with a valve port of the liquid inlet valve is arranged at the middle position of the lower part of the valve seat, a plurality of liquid inlet holes circumferentially distributed along the periphery of the liquid inlet cavity are further formed in the valve seat, an annular groove is formed in the outer wall surface of the valve seat, the liquid inlet holes penetrate through the liquid inlet cavity in a downward inclined mode from the bottom surface of the annular groove, and the liquid inlet channels are communicated with the liquid inlet holes through the annular groove. By means of the structure, gas in the liquid inlet cavity of the valve seat can rapidly enter the annular groove through the obliquely arranged liquid inlet holes and then enter the liquid inlet channel of the pump body, and rapid separation of gas and liquid phases in a gas-containing medium is achieved.
Preferably, the center line of the liquid inlet hole is arranged at an angle with the center line of the combined valve channel, and forms an oblique angle beta, and the oblique angle beta is identical with the oblique angle alpha. By the arrangement of the structure, the flowing resistance of the gas in the gas-containing medium is smaller when the gas rises, and the separation effect of the gas phase and the liquid phase is better.
Preferably, the center line of one of the liquid inlet holes and the center line of the liquid inlet flow channel are positioned on the same straight line. By the aid of the structure, flow resistance of gas in the gas-containing medium is further reduced when the gas rises, and separation effect of gas phase and liquid phase is improved.
Preferably, the recycling device comprises a recycling device, the bottom of the recycling device is connected with the recycling deviceThe top end of the liquid inlet manifold is communicated, a spherical floating valve is arranged in the recoverer, an air outlet is arranged at the upper part of the recoverer, a check valve is arranged at the air outlet, and the air outlet is communicated with an external medium storage tank through the check valve. The arrangement is such that the gas phase in the gas-containing medium is rapidly introduced into the inlet header and then collected in the recovery vessel above the inlet header and transported to the external storage tank, wherein the opening of the check valve is capable of introducing the gas phase CO 2 Or the gas in the gas-containing medium is sucked back into the storage tank.
Preferably, the liquid outlet valve and the liquid inlet valve comprise valve cores, first elastic pieces and valve covers, the valve covers are fixed on the valve seats, liquid inlet valve ports and liquid outlet valve ports are formed in the valve seats, the valve cores are matched with the corresponding valve ports, the first elastic pieces are abutted between the valve cores and the inner walls of the valve covers, side holes are formed in the valve covers of the liquid inlet valves at positions corresponding to the gaps, and the side holes are communicated with the plunger channels and the liquid inlet cavities. By means of the structure, when the gas-containing medium is conveyed, the gas-containing medium can directly flow from the liquid inlet cavity to the plunger channel through the side hole, so that the flow path between the liquid inlet cavity and the plunger channel is reduced, the invalid volume in the pump cavity is further reduced, and the working efficiency of the plunger pump is improved.
Preferably, a plurality of plunger channels, combined valve channels, plungers and combined valves are arranged in the pump body, wherein the arrangement directions of the plunger channels and the combined valve channels are consistent, and correspondingly, the pump body is provided with a plurality of liquid inlet flow channels communicated with the combined valve channels; the outside sealing welding of the pump body has the feed liquor manifold, the feed liquor manifold with a plurality of feed liquor runner are linked together to the both ends of feed liquor manifold are equipped with logical flange and blind flange respectively. By the aid of the structure, a plurality of plungers can act simultaneously, and the total conveying flow of the plunger pump is improved.
Preferably, a plug assembly is arranged at the front dead center position of the plunger channel, the plug assembly is fixed on the pump body through a front flange, the plug assembly comprises a plug, a movable column body and a second elastic piece, the movable column body is embedded in the plug and is coaxially arranged with the plunger, and the second elastic piece is propped between the plug and the movable column body. Because the plug head component has buffering protection effect on the plunger, the reserved gap between the end part of the plunger and the corresponding end surface of the plunger channel can be greatly reduced, so that the invalid volume in the plunger channel is obviously reduced, and the working efficiency of the plunger pump is improved.
Compared with the prior art, the utility model has the advantages that: the plunger channel center line of the hydraulic end of the plunger pump and the plunger channel center line of the combined valve are arranged in different planes, namely, the plunger in the plunger channel can avoid the extending direction of the combined valve channel, and the plunger channel is directly communicated with the combined valve channel through a notch on the side wall surface of the combined valve channel, so that the requirements of conveying fluid media and installing the combined valve are met, and a larger flowing space for medium circulation is not required to be reserved between a valve port of a liquid inlet valve and the plunger channel, thereby effectively reducing the dead volume of the plunger pump and greatly improving the working efficiency of the plunger pump; in addition, the combined valve channel is obliquely arranged from top to bottom, and correspondingly, the plane where the liquid inlet valve port of the liquid inlet valve of the combined valve is positioned is also an inclined plane, so that the valve core of the liquid inlet valve is opened and closed on the inclined plane, the gas-liquid exchange is carried out by the liquid carbon dioxide or other gas-containing media in the rapid exchange in the dynamic conveying process, the gas phase can be rapidly raised without being remained in the inner cavity of the plunger channel, the occurrence of the gas lock problem is avoided, and the working efficiency of the plunger pump is further improved.
Drawings
FIG. 1 is a schematic diagram of a fluid end of a plunger pump for delivering liquid carbon dioxide and other gaseous media in accordance with an embodiment of the present utility model;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along B-B in FIG. 2, wherein the combination valve is not shown;
FIG. 4 is a block diagram of a hydraulic end of a plunger pump for delivering liquid carbon dioxide and other gaseous media according to an embodiment of the present utility model, wherein the combination valve and plunger are not shown;
FIG. 5 is a block diagram of a combination valve for a fluid end of a plunger pump for delivering liquid carbon dioxide and other gaseous media in accordance with an embodiment of the present utility model;
FIG. 6 is a diagram showing the configuration of a fluid inlet manifold and a regenerator for a fluid end of a plunger pump for delivering liquid carbon dioxide and other gaseous media in accordance with an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1-2, a hydraulic end of a plunger pump for delivering liquid carbon dioxide and other gas-containing media comprises a pump body 10, a plunger 13 and a combined valve 20, wherein a plunger channel 11 and a combined valve channel 12 which are communicated are arranged in the pump body 10, the plunger 13 is movably arranged in the plunger channel 11, the combined valve 20 is arranged in the combined valve channel 12, the combined valve 20 comprises a liquid inlet valve 201 and a liquid outlet valve 202, the liquid inlet valve 201 of the combined valve 20 is arranged at the lower part of the combined valve channel 12, the liquid outlet valve 202 of the combined valve 20 is arranged at the upper part of the combined valve channel 12, wherein the liquid inlet valve 201 and the liquid outlet valve 202 are positioned at the same center line, specifically, a valve port of the liquid inlet valve 201 and a valve port of the liquid outlet valve 202 are positioned at the same center line, in this embodiment, the plunger channel 11 is horizontally arranged in the pump body 10, the combined valve channel 12 is obliquely arranged from top to bottom and positioned above the plunger channel 11, the center line of the combined valve channel 12 and the center line of the plunger channel 11 are arranged in different planes, a notch 120 is formed in a side wall surface of the lower end of the combined valve channel 12, the notch 120 is formed in the side wall surface of the notch 120, which is positioned at one side of the notch 120 of the cross section 11, which is positioned at the side of the notch 120 on the side of the plunger channel 11. In this embodiment, the plunger 13 located in the plunger channel 11 can avoid the extending direction of the combination valve channel 12, and the plunger channel 11 is directly communicated with the combination valve channel 12 through the notch 120 on the side wall surface of the combination valve channel 12, which not only meets the conveying requirement of the fluid medium and the installation requirement of the combination valve 20, but also does not need to leave a larger flowing space for medium circulation between the valve port of the liquid inlet valve 201 and the plunger channel 11, which effectively reduces the ineffective volume of the plunger pump and greatly improves the working efficiency of the plunger pump; in addition, the combined valve channel 12 is obliquely arranged from top to bottom, and correspondingly, the plane where the liquid inlet valve port of the liquid inlet valve 201 of the combined valve 20 is located is also an inclined plane, so that the valve core 22a of the liquid inlet valve 201 is opened and closed on the inclined plane, which ensures that liquid carbon dioxide or other gas-containing media exchange gas and liquid at the fastest speed in dynamic conveying, wherein gas phase can rise rapidly without being retained in the inner cavity of the plunger channel 11, and liquid phase is retained in the inner cavity of the plunger channel 11, thereby avoiding the occurrence of air lock problem and further improving the working efficiency of the plunger pump. Of course, the hydraulic end of the plunger pump in this embodiment may further include a front guide sleeve 14, a spring seat, a self-sealing spring 3, a main packing seal 17, a rear compression ring 16, a secondary packing seal 18, a box body 15, an oil pump circulation oil supply assembly 1, an adjusting nut 19, an upper compression ring 25, an upper flange 26, a plug head assembly 80 and a front flange 84, specifically, the plunger channel 11 is internally provided with a main and secondary two-section packing, the rear compression ring 16, the front guide sleeve 14, the spring seat and the self-sealing spring 3, which are used for adjusting the automatic compensation after the packing wear, so as to ensure the sealing performance of the plunger 13 in the process of reciprocating movement in the plunger channel 11, wherein the box body is mounted on a step of the plunger channel 11 of the pump body 10, the box body is internally provided with the secondary packing seal 18, the oil pump circulation oil supply assembly 1 provides circulated lubricating oil through the oil return pipe 4 and the lubricating oil exchange tank 2, so as to circularly lubricate the main and secondary packing at the periphery of the plunger 13, ensure the friction coefficient of the packing to be the lowest value, so as to reduce the power consumption, and the adjusting nut 19 is used for sealing the leakage of the lubricating oil; the combination valve 20 is installed in the combination valve channel 12 and can be fixed through an upper pressing ring 25 and an upper flange 26; the plug head assembly 80 and the forward flange 84 may seal the forward end of the plunger channel 11.
Referring to fig. 5 together, the liquid inlet valve 201 and the liquid outlet valve 202 of the combined valve 20 share the same valve seat 21, the liquid outlet valve 202 and the liquid inlet valve 201 are respectively located at the upper end face and the lower end face of the valve seat 21, the liquid outlet valve port is formed in the upper end face of the valve seat 21, the liquid inlet cavity 211 communicated with the liquid outlet valve port is formed in the middle position of the upper portion of the valve seat 21, the liquid inlet cavity 210 communicated with the valve port of the liquid inlet valve 201 is formed in the middle position of the lower portion of the valve seat 21, specifically, the liquid outlet valve 202 and the liquid inlet valve 201 also comprise valve cores 22a and 22b, first elastic pieces 23a and 23b and valve covers 24a and 24b, the valve covers 24a and 24b are fixed on the valve seat 21, the valve cores 22a and 22b are arranged in the valve covers 24a and 24b and are matched on corresponding valve ports (namely the liquid inlet valve ports or the liquid outlet valve ports), the first elastic pieces 23a and 23b are abutted between the valve cores 22a and 22b and the inner walls of the covers a and 24b so as to control the liquid inlet valve cores 202 and the valve ports to be communicated with the side holes, specifically, the valve covers 201 a and the valve covers 11 and the valve inlets are opened at the positions of the corresponding side holes 240 and the valve covers 11 and the valve inlets are opened. When the gas-containing medium is conveyed by the plunger pump, the gas-containing medium can directly flow from the liquid inlet cavity 210 to the plunger channel 11 through the side hole 240 on the valve cover 24a of the liquid inlet valve 201, so that the flow path between the liquid inlet cavity 210 and the plunger channel 11 is shortened, the invalid volume in the pump cavity is further reduced, and the working efficiency of the plunger pump is improved.
In order to enable the plunger pump to separate the gas phase from the liquid phase more quickly when the gas-containing medium is conveyed, the occurrence of the gas lock phenomenon is avoided, as shown in fig. 3, the central line of the combined valve channel 12 is perpendicular to the central line of the plunger channel 11, and the notch 120 is positioned on a side wall surface of a relatively lower position in the combined valve channel 12, wherein the central line of the combined valve channel 12 forms an included angle v with a vertical plane passing through the central line of the plunger channel 11, and the included angle can be in the range of 10-60 degrees, wherein 20 degrees are preferred; further, a recovery device for recovering the gaseous medium is further arranged on the outer side of the pump body 10, a liquid inlet channel 100 which is obliquely arranged from top to bottom is arranged on the pump body 10, the upper end of the liquid inlet channel 100 is communicated with the recovery device, the lower end of the liquid inlet channel 100 is communicated with the combined valve channel 12, wherein an oblique angle alpha is formed between the central line of the liquid inlet channel 100 and the central line of the combined valve channel 12, and detailed views of fig. 3 and 4 are shown; the liquid inlet channel 100 is obliquely arranged from top to bottom, so that the gas phase and the liquid phase in the gas-containing medium can be conveniently and quickly lifted into the recovery device after being separated; still further, the valve seat 21 is further provided with a plurality of liquid inlet holes 30 circumferentially arranged along the periphery of the liquid inlet cavity 210, the outer wall surface of the valve seat 21 is provided with an annular groove 40, the liquid inlet holes 30 are downwardly inclined from the bottom surface of the annular groove 40 to penetrate into the liquid inlet cavity 210, and the liquid inlet flow channel 100 is communicated with the liquid inlet holes 30 through the annular groove 40, wherein the central line of the liquid inlet holes 30 and the central line of the combined valve channel 12 form an oblique angle beta, which is identical to the oblique angle alpha, wherein the oblique angle beta is an acute angle, the size of the oblique angle beta can be selected according to the inclination angle of the combined valve channel 12, namely, the oblique angle beta is matched with the oblique angle v, so that gas can be quickly lifted into the recoverer 60, and particularly, the oblique angle beta ranges preferably from 20 degrees to 80 degrees, and more preferably 70 degrees. By means of the structure, gas in the liquid inlet cavity 210 of the valve seat 21 can rapidly enter the annular groove 40 through the obliquely arranged liquid inlet holes 30 and then enter the liquid inlet channel of the pump body 10, and rapid separation of gas and liquid phases in a gas-containing medium is achieved. Further, in order to reduce the flow resistance of the gas in the gas-containing medium during the rising, and improve the separation effect of the gas phase and the liquid phase, in this embodiment, the center line of one of the liquid inlet holes 30 and the center line of the liquid inlet channel 100 are located on the same straight line, that is, one of the liquid inlet holes 30 and the liquid inlet channel 100 are coaxially arranged and mutually communicated, and of course, the liquid inlet holes 30 and the liquid inlet channel 100 may also be mutually staggered. In addition, the number of the liquid inlet holes 30 may be selected according to the flow rate of the medium fluid, in this embodiment, for convenience in processing, the liquid inlet holes 30 may be set to be two, the valve seat 21 further has liquid outlet holes 31 communicating the plunger channel 11 and the liquid outlet cavity 211, and the liquid outlet holes 31 may be arranged with the liquid inlet holes 30 at staggered intervals.
Referring to fig. 1 and 3, in order to increase the total delivery flow rate of the plunger pump, a plurality of plunger passages 11, a combination valve passage 12, a plunger 13 and a combination valve 20 may be disposed in the pump body 10, and specifically, a different number of plunger passages 11 may be disposed according to the number of cylinders of the plunger pump, where the arrangement directions of the plunger passages 11 and the combination valve passages 12 are consistent, and accordingly, the pump body 10 is provided with a plurality of liquid inlet passages 100 communicating with the combination valve passages 12, and it is conceivable that the pump body 10 is further provided with a plurality of liquid outlet passages 101 communicating with the combination valve passages 12, and the liquid outlet passages 101 are used for delivering the fluid medium discharged from the liquid outlet valve 202 to the outside; the outside of the pump body 10 is provided with a liquid inlet manifold 50, the liquid inlet manifold 50 is communicated with a plurality of liquid inlet channels 100, two ends of the liquid inlet manifold 50 are respectively provided with a through flange 51 and a blind flange 52, the through flange 51 and the blind flange 52 can be exchanged according to the installation requirement, wherein a liquid inlet channel is connected to the lower part of the liquid inlet manifold 50, the central line of the liquid inlet channel 100 of the pump body 10 forms an included angle with the horizontal plane passing through the axis of the liquid inlet manifold 50, so that gas-containing medium can enter the liquid inlet channel 100 actively in the conveying process, gas automatically rises into the liquid inlet manifold 50, specifically, the pump body 10 is approximately rectangular and is provided with a front inclined plane, the liquid inlet manifold 50 can be welded on the front inclined plane of the pump body 10 in a sealing way, and the liquid inlet manifold 50 and the pump body 10 can be fixed by adopting the flange; referring to fig. 2 and 6, the recovery device for recovering a gas phase medium includes a recovery unit 60, a bottom of the recovery unit 60 is connected to a top end of a liquid inlet manifold 50, a ball-shaped float valve 70 for pressure stabilization is built in the recovery unit 60, an air outlet 61 is provided at an upper portion of the recovery unit 60, a check valve 71 is provided at the air outlet 61, and the air outlet 61 is connected to an external medium storage tank (not shown) through the check valve 71. Specifically, the recoverer 60 is a cylindrical barrel, and is vertically arranged on the liquid inlet manifold 50, the floating valve 70 can float up and down in the cylindrical barrel in 360 ° autorotation, wherein in the action process of the plunger pump, the gas gasified by the gas-containing medium in the cavity of the plunger 13 can enter the liquid inlet manifold 50 through the liquid inlet cavity 210, the liquid inlet hole 30 and the liquid inlet flow channel 100 in sequence, then continuously ascend and can be accumulated in the recoverer 60 through the peripheral gap of the floating valve 70 in the recoverer 60, and the opening of the check valve 71 can recover the gas-phase medium into the external medium storage tank to achieve the zero discharge requirement.
Referring to fig. 2, a plug assembly 80 is disposed at a front dead center position of the plunger channel 11, the plug assembly 80 is fixed on the pump body 10 through a front flange 84, the plug assembly 80 includes a plug 81, a movable column 82 and a second elastic member 83, the movable column 82 is embedded in the plug 81 and coaxially disposed with the plunger 13, the second elastic member 83 is propped between the plug 81 and the movable column 82, specifically, the movable column 82 is a rigid member, the size of the rigid member is matched with the size of the end of the plunger 13, the second elastic member 83 can be a rubber spring, and since the plug assembly 80 has a buffering protection function on the plunger 13, a reserved gap between the end of the plunger 13 and the corresponding end surface of the plunger channel 11 can be reduced to 2mm, so that an ineffective volume in the plunger channel 11 is obviously reduced, and the working efficiency of the plunger pump is improved.
The working principle of the utility model is as follows: when the plunger 13 moves backwards, the liquid inlet valve 201 is opened, the gas-containing medium in the liquid inlet manifold 50 sequentially enters the inner cavity of the plunger channel 11 through the liquid inlet channel 100 of the pump body 10 and the liquid inlet hole 30 of the liquid inlet valve 201, wherein when the liquid inlet valve 201 is opened, gas and liquid can be exchanged instantaneously, the gas phase of the gas-containing medium rapidly rises to leave the inner cavity of the plunger channel 11 and enter a recovery device positioned at a high position, and the liquid phase of the gas-containing medium fills the accommodating cavity of the plunger channel 11; when the plunger 13 moves forwards, the liquid inlet valve 201 is closed, the pressure in the cavity of the plunger 13 is increased, the liquid discharge valve is opened, liquid is discharged from the liquid discharge cavity, and the reciprocating cycle is carried out. Because the central line of the plunger channel 11 of the hydraulic end of the plunger pump and the central line of the combined valve channel 12 are arranged in different planes, the ineffective volume in the plunger channel 11 of the plunger pump is greatly reduced, the working efficiency is improved, the combined valve channel 12 is obliquely arranged from top to bottom, and correspondingly, the plane of the liquid inlet valve port of the liquid inlet valve 201 of the combined valve 20 is also an inclined plane, so that the opening and closing of the valve core 22a of the liquid inlet valve 201 are performed on the inclined plane, the liquid carbon dioxide or other gas-containing media are ensured to exchange gas and liquid at the fastest speed in dynamic conveying, wherein the gas phase can be quickly risen into the recoverer 60 positioned at a high position and cannot be retained in the inner cavity of the plunger channel 11, the liquid phase enters the inner cavity of the plunger channel 11, the plunger pump is ensured to work in a full liquid state (or near the full liquid state), the occurrence of an air lock phenomenon is avoided, and the working efficiency of the plunger pump is further improved. On the other hand, the center line of the liquid inlet flow channel 100 on the pump body 10 and the center line of the liquid inlet hole 30 on the valve seat 21 are both arranged at an angle with the center line of the combined valve channel 12, and the two angles are the same (namely, the oblique angle beta is the same as the oblique angle alpha) and are matched with the inclination angle (namely, the included angle v) of the combined valve channel 12, so that the structure shortens the flow path of gas in the rising process, reduces the flow resistance, ensures that the gas can quickly rise into the recoverer 60, and improves the gas-liquid separation efficiency.
Claims (10)
1. A plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media, comprising:
the pump body (10), the pump body (10) is internally provided with a plunger channel (11) and a combined valve channel (12) which are communicated with each other;
the plunger (13) is movably arranged in the plunger channel (11);
the combined valve (20) is arranged in the combined valve channel (12), wherein a liquid inlet valve (201) of the combined valve (20) is arranged at the lower part of the combined valve channel (12), and a liquid outlet valve (202) of the combined valve (20) is arranged at the upper part of the combined valve channel (12);
the method is characterized in that: the plunger channel (11) is horizontally arranged in the pump body (10), the combined valve channel (12) is obliquely arranged from top to bottom and is positioned above the plunger channel (11), the liquid inlet valve (201) and the liquid outlet valve (202) are positioned on the same central line, the central line of the combined valve channel (12) and the central line of the plunger channel (11) are arranged in different planes, and a notch (120) is formed in the side wall surface of the lower end of the combined valve channel (12), and the notch (120) is communicated with the plunger channel (11).
2. The plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media of claim 1, wherein: the central line of the combined valve channel (12) is perpendicular to the central line of the plunger channel (11), and the notch (120) is positioned on a side wall surface of a relatively lower position in the combined valve channel (12).
3. A plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media according to claim 1 or 2, wherein: the utility model discloses a pump, including pump body (10), combination valve passageway (12), pump body (10) outside still is provided with the recovery unit who is used for retrieving gaseous medium, set up on pump body (10) inlet channel (100) that top-down slope set up, the upper end of inlet channel (100) communicates recovery unit, the lower extreme of inlet channel (100) communicates combination valve passageway (12), and the central line of inlet channel (100) with combination valve passageway (12) central line forms an oblique angle alpha.
4. A plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media as claimed in claim 3, wherein: the liquid outlet valve (202) and the liquid inlet valve (201) share a valve seat (21), and are respectively located at the upper end and the lower end of the valve seat (21), a liquid inlet cavity (210) communicated with a valve port of the liquid inlet valve (201) is formed in the middle position of the lower portion of the valve seat (21), a plurality of liquid inlet holes (30) circumferentially distributed along the periphery of the liquid inlet cavity (210) are formed in the valve seat (21), an annular groove (40) is formed in the outer wall surface of the valve seat (21), the liquid inlet holes (30) are downwards inclined from the bottom surface of the annular groove (40) to penetrate through the liquid inlet cavity (210), and the liquid inlet channel (100) is communicated with the liquid inlet holes (30) through the annular groove (40).
5. The plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media of claim 4, wherein: the central line of the liquid inlet hole (30) and the central line of the combined valve channel (12) form an oblique angle beta, and the oblique angle beta is the same as the oblique angle alpha.
6. The plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media of claim 5, wherein: the central line of one of the liquid inlet holes (30) and the liquid inlet channel (100) are positioned on the same straight line.
7. A plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media as claimed in claim 3, wherein: the pump body (10) is provided with a plurality of liquid inlet flow passages (100) communicated with the combined valve channels (12) and a plurality of liquid inlet manifold (50) communicated with the liquid inlet flow passages (100), the recovery device comprises a recovery device (60), the bottom of the recovery device (60) is communicated with the top end of the liquid inlet manifold (50), the recovery device is characterized in that a spherical floating valve (70) is arranged in the recovery device (60), an air outlet (61) is formed in the upper portion of the recovery device (60), a check valve (71) is arranged at the air outlet (61), and the air outlet (61) is communicated with an external medium storage tank through the check valve (71).
8. The plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media of claim 4, wherein: the liquid outlet valve (202) and the liquid inlet valve (201) further comprise valve cores (22 a,22 b), first elastic pieces (23 a,23 b) and valve covers (24 a,24 b), the valve covers (24 a,24 b) are fixed on the valve seat (21), the valve seat (21) is provided with liquid inlet valve ports and liquid outlet valve ports, the valve cores (22 a,22 b) are matched on corresponding valve ports, and the first elastic pieces (23 a,23 b) are abutted between the valve cores (22 a,22 b) and the inner walls of the valve covers (24 a,24 b);
a side hole (240) is formed in a valve cover (24 a) of the liquid inlet valve (201) at a position corresponding to the notch (120), and the side hole (240) is communicated with the plunger channel (11) and the liquid inlet cavity (210).
9. The plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media of claim 7, wherein: a plurality of plunger channels (11), combined valve channels (12), plungers (13) and combined valves (20) are arranged in the pump body (10), wherein the arrangement directions of the plunger channels (11) and the combined valve channels (12) are consistent;
the outside of the pump body (10) is welded with the liquid inlet manifold (50) in a sealing way, and the two ends of the liquid inlet manifold (50) are respectively provided with a through flange (51) and a blind flange (52).
10. A plunger pump fluid end for delivering liquid carbon dioxide and other gaseous media according to claim 1 or 2, wherein: a plug head assembly (80) is arranged at the front dead center position of the plunger channel (11), and the plug head assembly (80) is fixed on the pump body (10) through a front flange (84);
the plug assembly (80) comprises a plug (81), a movable column (82) and a second elastic piece (83), wherein the movable column (82) is embedded in the plug (81) and is coaxially arranged with the plunger (13), and the second elastic piece (83) is propped between the plug (81) and the movable column (82).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811021107.9A CN108843531B (en) | 2018-09-03 | 2018-09-03 | Plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811021107.9A CN108843531B (en) | 2018-09-03 | 2018-09-03 | Plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media |
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| CN108843531A CN108843531A (en) | 2018-11-20 |
| CN108843531B true CN108843531B (en) | 2024-02-02 |
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| CN201811021107.9A Active CN108843531B (en) | 2018-09-03 | 2018-09-03 | Plunger pump fluid end for conveying liquid carbon dioxide and other gas-containing media |
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