Multi-stage supercharging double-state CO2 medium reciprocating pump

Abstract

According to the multi-stage supercharging double-state CO2 medium reciprocating pump, the horizontal fluid end and the vertical fluid end are arranged at the front end of the power end and above the power end respectively, the occupied area is small, the horizontal fluid end and the vertical fluid end are driven at the same time through one set of power end, and the size of the power end is small; during pressurization, the horizontal fluid end is used for conducting first-stage pressurization and second-stage pressurization on the gaseous CO2 medium, the CO2 medium pressed into the connecting manifold after secondary pressurization is turned to be in a liquid state through pressure adjustment of the primary pressure adjusting mechanism, and then the vertical fluid end is used for conducting third-stage pressurization and fourth-stage pressurization on the liquid CO2 medium. And the pressure of the liquid CO2 medium output after four-stage pressurization is controlled through the secondary pressure regulating mechanism, so that the pressurization effect on CO2 media in different forms is better, the pressurization requirements can be shared to the first-stage pressurization and the second-stage pressurization of the horizontal fluid end and the third-stage pressurization and the fourth-stage pressurization of the vertical fluid end, and the single fluid end can be completed through small size and power.

Description

Technical Field

[0001] The present invention relates to the technical field of reciprocating pumps, and particularly to a multi-stage supercharging dual-state CO2 medium reciprocating pump. Background Art

[0002] The tertiary oil recovery process in oil fields is committed to trying various processes of CO2 flooding technology. The process route combining liquid CO2 flooding and dense-state CO2 flooding has been applied in many oil fields in practice and achieved initial results.

[0003] Due to the long-term injection of CO2 in the slug area, the gaseous CO2 in this part is mixed with natural gas and enters the surface separator. How to handle the remaining CO2 after recovering natural gas is a problem that technicians need to solve. The current treatment method is to use imported multi-stage compressors to boost the remaining CO2 and then reinject it underground. However, multi-stage compressors cannot carry liquids and must dehydrate the CO2 before injection. Moreover, the multi-stage compressors themselves are relatively large in volume, and when combined with dehydration equipment, the entire CO2 reinjection system occupies a large area and has a high cost. In addition, the pressure boost difference of gaseous CO2 is relatively large, generally boosting from 0.2 MPa to 35 MPa, and the pressure boost is difficult. During the pressure boost process, the gaseous CO2 medium will be converted into a liquid state, and when the pressure of CO2 exceeds the critical value of 7.4 MPa and the temperature exceeds 31.1 °C, the liquid CO2 medium will further enter the supercritical state, making it difficult to use multi-stage compressors. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a multi-stage supercharging reciprocating pump with a relatively small floor area, a relatively low price, a relatively small pressure boost difficulty, and still being able to operate normally when the CO2 medium becomes liquid.

[0005] The technical solution adopted by the present invention to solve the above problems is: a multi-stage supercharging dual-state CO2 medium reciprocating pump, including a power end, a horizontal hydraulic end arranged at the front end of the power end, a vertical hydraulic end arranged above the power end, a connecting pipe assembly connected between the horizontal hydraulic end and the vertical hydraulic end, and a pressure regulating assembly; The horizontal hydraulic end includes a horizontal pump body, two gaseous valve groups arranged front and back in the horizontal pump body, a horizontal piston assembly driven by the power end to reciprocate between the two gaseous valve groups, and an intake pipe assembly; The vertical hydraulic end includes a vertical pump body, two liquid valve groups arranged up and down in the vertical pump body, a vertical piston assembly driven by the power end to reciprocate between the two liquid valve groups, and a liquid discharge pipe assembly; The pressure regulating assembly includes a primary pressure regulating mechanism and a secondary pressure regulating mechanism; When the gaseous CO2 medium enters the horizontal hydraulic end from the inlet pipe manifold and the horizontal piston assembly moves towards the gaseous valve group in the forward position, the gaseous CO2 medium is pressed into the primary pressure regulating mechanism for primary pressurization; when the horizontal piston assembly moves towards the gaseous valve group in the backward position, the gaseous CO2 medium is pressed into the connecting pipe manifold for secondary pressurization, and the primary pressure regulating mechanism adjusts the pressure so that the CO2 medium entering the connecting pipe manifold turns into a liquid state; when the liquid CO2 medium enters the vertical hydraulic end from the connecting pipe manifold and the vertical piston assembly moves towards the liquid valve group in the upward position, the liquid CO2 medium is pressed into the secondary pressure regulating mechanism for tertiary pressurization; when the vertical piston assembly moves towards the liquid valve group in the downward position, the liquid CO2 medium is pressed into the drain pipe manifold for quaternary pressurization.

[0006] Compared with the prior art, the horizontal hydraulic end and the vertical hydraulic end of the present invention are respectively arranged at the front end and above the power end, reasonably utilizing the space at the front end and above the hydraulic end, making the floor area of the whole reciprocating pump smaller, and driving the horizontal hydraulic end and the vertical hydraulic end by a set of power end at the same time, making the volume of the power end smaller and the cost lower; due to the particularity that the CO2 medium will change from gaseous to liquid when reaching the supercritical state, during pressurization, the horizontal hydraulic end is used to perform primary and secondary pressurization on the gaseous CO2 medium, and the pressure of the primary pressure regulating mechanism is adjusted so that the CO2 medium pressed into the connecting pipe manifold after secondary pressurization turns into a liquid state, and then the vertical hydraulic end is used to perform tertiary and quaternary pressurization on the liquid CO2 medium, and the secondary pressure regulating mechanism controls the liquid CO2 medium output after quaternary pressurization to be converted into the supercritical state. With this setting, the horizontal hydraulic end and the vertical hydraulic end can respectively set parameters such as internal volume, flow channel, wall thickness, and temperature according to the characteristics of gaseous and liquid CO2 media, making the pressurization effect on different forms of CO2 media better, and being able to allocate the pressurization requirements to the primary and secondary pressurization of the horizontal hydraulic end and the tertiary and quaternary pressurization of the vertical hydraulic end, so that a single hydraulic end can be completed with a smaller size and power, which is beneficial to reducing the pressurization difficulty and reducing the volume and manufacturing cost of the horizontal hydraulic end and the vertical hydraulic end.

[0007] In a multi-stage pressurization dual-state CO2 medium reciprocating pump of the present invention, the primary pressure regulating mechanism has a first flow channel, a second flow channel, and a third flow channel arranged between the first flow channel and the second flow channel; the primary pressure regulating mechanism includes a first pressure regulating valve; the first pressure regulating valve includes a first conical pressure regulating part arranged in the third flow channel and a first control part arranged at one end of the first conical pressure regulating part; the first conical pressure regulating part has at least one gas groove arranged circumferentially. The secondary pressure regulating mechanism has a fourth flow channel, a fifth flow channel, and a sixth flow channel disposed between the fourth flow channel and the fifth flow channel; the secondary pressure regulating mechanism includes a second pressure regulating valve; the second pressure regulating valve includes a second conical pressure regulating portion disposed in the sixth flow channel and a second control portion disposed at one end of the second conical pressure regulating portion.

[0008] A multi-stage supercharging dual-state CO2 medium reciprocating pump according to the present invention, wherein the gaseous valve group includes a first valve body, a planar liquid discharge valve plate disposed on one side of the first valve body, a planar liquid inlet valve plate disposed on the other side of the first valve body, a first exhaust gas flow channel disposed in the first valve body and controlled by the planar liquid discharge valve plate, and a first intake air flow channel disposed in the first valve body and controlled by the planar liquid inlet valve plate.

[0009] A multi-stage supercharging dual-state CO2 medium reciprocating pump according to the present invention, wherein the liquid valve group includes a second valve body, a spherical liquid discharge valve plate disposed on one side of the second valve body, a spherical liquid inlet valve plate disposed on the other side of the second valve body, a second liquid discharge flow channel disposed in the second valve body and controlled by the spherical liquid discharge valve plate, and a second liquid inlet flow channel disposed in the second valve body and controlled by the spherical liquid inlet valve plate; Both the spherical liquid discharge valve plate and the spherical liquid inlet valve plate include spherical valve cores.

[0010] A multi-stage supercharging dual-state CO2 medium reciprocating pump according to the present invention, wherein the horizontal piston assembly includes a horizontal piston rod and a horizontal piston head; the horizontal piston head reciprocates between two gaseous valve groups arranged front and back; the vertical piston assembly includes a vertical piston rod and a vertical piston head; the vertical piston head reciprocates between two liquid valve groups.

[0011] A multi-stage supercharging dual-state CO2 medium reciprocating pump according to the present invention, wherein the side wall of the horizontal pump body has a first cooling hole, and the first cooling hole and the primary pressure regulating mechanism jointly control the state of the CO2 medium in the horizontal hydraulic end, so that the CO2 medium entering the connecting manifold turns into a liquid state; the side wall of the vertical pump body has a second cooling hole, and the second cooling hole and the secondary pressure regulating mechanism jointly control the state of the CO2 medium in the vertical hydraulic end.

[0012] A multi-stage supercharging dual-state CO2 medium reciprocating pump according to the present invention, wherein the power end includes a combined rotation assembly and a fuselage, and a double positioning sleeve disposed at the front end of the fuselage; the double positioning sleeve includes an outer sleeve body and a wear-resistant sleeve coaxially disposed inside the outer sleeve body; the combined rotation assembly includes a rack shaft, and the front end of the rack shaft reciprocates in the wear-resistant sleeve.

[0013] The present invention provides a multi-stage pressurized dual-state CO2 medium reciprocating pump, wherein the conjoined rotating assembly includes a half-tooth cam driven by the rack shaft to reciprocate; the front end of the rack shaft is connected to the rear end of the horizontal piston rod, so that the back-and-forth reciprocating motion of the rack shaft drives the horizontal piston head to reciprocate between the two gas valve groups arranged in front and behind through the horizontal piston rod; the lower end of the vertical piston rod is connected to the half-tooth cam, so that the rotational reciprocating motion of the half-tooth cam drives the vertical piston head to reciprocate between the two liquid valve groups through the vertical piston rod; The rack shaft drives the horizontal piston rod to have a stroke of L1. Under the stroke of L1, the gaseous CO2 medium is converted into a liquid state when entering the connecting manifold; The stroke of the vertical piston rod driven by the half-tooth cam is L2. Under the stroke L2, the liquid CO2 medium enters the discharge manifold.

[0014] The present invention provides a multi-stage pressurized dual-state CO2 medium reciprocating pump, wherein the body comprises a support bracket; the support bracket is arranged on a side of the rack shaft away from the half-tooth cam.

[0015] The multi-stage pressurized dual-state CO2 medium reciprocating pump of the present invention also includes a pressure gauge; the pressure gauge is arranged in at least one of the connecting manifold, the air intake manifold, the liquid discharge manifold, the primary pressure regulating mechanism and the secondary pressure regulating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of a horizontal hydraulic end; Figure 3 It is a cross-sectional schematic diagram of a vertical hydraulic end; Figure 4 A schematic cross-sectional view of the primary pressure regulating mechanism from one side; Figure 5 It is a cross-sectional schematic diagram of the primary pressure regulating mechanism from another side perspective; Figure 6 It is a cross-sectional schematic diagram of a secondary pressure regulating mechanism from a side perspective; Figure 7 It is a cross-sectional schematic diagram of the primary pressure regulating mechanism from another side perspective; Figure 8 It is an enlarged schematic diagram of the gas valve group; Figure 9 It is an enlarged schematic diagram of the liquid valve group; Figure 10 It is an enlarged schematic diagram of the interior of the power end; Figure 11 Schematic diagram of parameters of the four-stage pressurization process of CO2 medium in some embodiments. Detailed implementation manners

[0017] Before detailing any implementation manner of the present invention, it should be understood that in its application, the present invention is not limited to the details of the construction and arrangement of the components described in the following description or illustrated in the following drawings. The present invention is capable of having other implementation manners and can be practiced or carried out in various ways. Additionally, it should be understood that the wording and terminology used herein are for the purpose of description and should not be regarded as restrictive. As used herein, "including" or "having" and their variants are intended to cover the items listed hereinafter and their equivalents as well as additional items. Unless otherwise specified or restricted, the terms "mounted", "connected", "supported", and "coupled" and their variants are used broadly and cover direct mounting and indirect mounting, connection, support, and coupling. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connection or coupling.

[0018] Moreover, on the one hand, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention; on the other hand, the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. The term "a" should not be construed as limiting the quantity.

[0019] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Without departing from the described principles, the implementation manners of the present invention can have any deformation or modification.

[0020] The embodiments of the present invention will be further described below with reference to the drawings.

[0021] Please refer to a multi-stage supercharged dual-state CO2 medium reciprocating pump shown in the figure. It includes a power end 1, a horizontal hydraulic end 2 arranged at the front end of the power end 1, a vertical hydraulic end 3 arranged above the power end 1, a connecting pipe assembly 4 connected between the horizontal hydraulic end 2 and the vertical hydraulic end 3, and a pressure regulating assembly 5. The horizontal hydraulic end 2 includes a horizontal pump body 21, two gaseous valve groups 22 arranged front and back in the horizontal pump body 21, a horizontal piston assembly 23 driven by the power end 1 to reciprocate between the two gaseous valve groups 22, and an intake pipe assembly 24. The vertical hydraulic end 3 includes a vertical pump body 31, two liquid valve groups 32 arranged up and down in the vertical pump body 31, a vertical piston assembly 33 driven by the power end 1 to reciprocate between the two liquid valve groups 32, and a liquid discharge pipe assembly 34. The pressure regulating assembly 5 includes a primary pressure regulating mechanism 51 and a secondary pressure regulating mechanism 52. When the gaseous CO2 medium enters the horizontal hydraulic end 2 from the intake pipe assembly 24 and the horizontal piston assembly 23 moves towards the gaseous valve group 22 at the forward position, the gaseous CO2 medium is pressed into the primary pressure regulating mechanism 51 and undergoes primary supercharging. When the horizontal piston assembly 23 moves towards the gaseous valve group 22 at the backward position, the gaseous CO2 medium is pressed into the connecting pipe assembly 4 and undergoes secondary supercharging, and the primary pressure regulating mechanism 51 adjusts the pressure so that the CO2 medium entering the connecting pipe assembly 4 turns into a liquid state. When the liquid CO2 medium enters the vertical hydraulic end 3 from the connecting pipe assembly 4 and the vertical piston assembly 33 moves towards the liquid valve group 32 at the upper position, the liquid CO2 medium is pressed into the secondary pressure regulating mechanism 52 and undergoes tertiary supercharging. When the vertical piston assembly 33 moves towards the liquid valve group 32 at the lower position, the liquid CO2 medium is pressed into the liquid discharge pipe assembly 34 and undergoes quaternary supercharging.

[0022] In actual use, the horizontal hydraulic end 2 and the vertical hydraulic end 3 of the present invention are respectively arranged at the front end and above the power end 1, reasonably utilizing the space in front of and above the hydraulic end, making the floor area of the whole reciprocating pump smaller. And by using a set of power end 1 to drive the horizontal hydraulic end 2 and the vertical hydraulic end 3 simultaneously, the volume of the power end is smaller and the cost is lower. Due to the particularity that the CO2 medium changes from gaseous state to liquid state when it reaches the supercritical state, during pressurization, the horizontal hydraulic end 2 is used to perform primary and secondary pressurization on the gaseous CO2 medium, and through the pressure regulation of the primary pressure regulating mechanism 51, the CO2 medium that is pressed into the connecting pipe manifold 4 after secondary pressurization is turned into a liquid state. Then, the vertical hydraulic end 3 is used to perform tertiary and quaternary pressurization on the liquid CO2 medium, and through the secondary pressure regulating mechanism 52, the liquid CO2 medium output after quaternary pressurization is controlled to be converted into the supercritical state. In this setting, the horizontal hydraulic end 2 and the vertical hydraulic end 3 can respectively set parameters such as internal volume, wall thickness, and temperature according to the characteristics of gaseous and liquid CO2 media, resulting in better pressurization effects for different forms of CO2 media. And the pressurization requirements can be distributed to the primary and secondary pressurization of the horizontal hydraulic end 2 and the tertiary and quaternary pressurization of the vertical hydraulic end 3, enabling a single hydraulic end to be completed with a smaller size and power, which is beneficial to reducing the pressurization difficulty and reducing the volume and manufacturing cost of the horizontal hydraulic end 2 and the vertical hydraulic end 3.

[0023] It is worth mentioning that multi-stage compressors are usually designed to compress gases rather than liquids. The reason is that the compression process in a multi-stage compressor depends on the compressibility of the gas. If liquid enters the compressor, it may cause damage to the compressor or prevent it from working properly. Moreover, the density of the liquid is usually much larger than that of the gas, and the liquid also has a relatively large viscosity, which will cause problems when the liquid moves inside the compressor, possibly resulting in liquid impact or accumulation on some components, causing damage or blockage. Therefore, when the gaseous CO2 medium turns into a liquid during the pressurization process, especially when the pressure exceeds 7.4 MPa and the temperature exceeds 31.1 °C and enters the critical value, it is difficult to use a multi-stage compressor. While reciprocating pumps or piston pumps are usually designed to transport liquids, and their working principle is to change the volume inside the pump cavity through the movement of the piston, thereby achieving pressurization or transportation of the liquid. And reciprocating pumps can handle high-pressure and high-viscosity liquids. Therefore, when the CO2 medium changes from gaseous state to liquid state, the present invention can still work normally without the need to additionally set up a dehydration device, which is beneficial to reducing the floor area and cost.

[0024] Please continue to refer to Figure 11, It should be noted that due to the particularity of the CO2 medium, in the aforementioned four-stage pressurization process, the gaseous CO2 medium is pressurized from 0.2 MPa to 40 MPa through multiple stages. After pressurization, the density of the CO2 medium increases, the volume decreases, and it changes from a gaseous state to a liquid state and finally enters the supercritical state; after the CO2 medium turns into a liquid state, with the change of pressure, the density of the liquid CO2 medium is always changing, and the higher the pressure, the greater the density. The key to the efficiency of the injection equipment lies in the design of the volume. Therefore, the liquid CO2 medium is an unconventional liquid; in the supercritical state, the density of the CO2 medium is close to that of a liquid, the viscosity is close to that of a gas, and the diffusion coefficient is 100 times that of a liquid. It is a compressible liquid.

[0025] It can be understood that in some other embodiments, the liquid inlet manifold 24 can also be arranged on the vertical pump body 31, and the liquid discharge manifold 34 can also be arranged on the horizontal pump body 21.

[0026] Please continue to refer to Figure 2 、 Figure 4 、 Figure 5 , wherein the primary pressure regulating mechanism 51 has a first flow channel 511, a second flow channel 512, and a third flow channel 513 arranged between the first flow channel 511 and the second flow channel 512; the primary pressure regulating mechanism 51 includes a first pressure regulating valve 514; the first pressure regulating valve 514 includes a first conical pressure regulating part 5141 arranged in the third flow channel 513 and a first control part 5142 arranged at one end of the first conical pressure regulating part 5141; the first conical pressure regulating part 5141 has at least one gas groove 51411 arranged circumferentially. Since the pressure for transporting the gaseous CO2 medium during the first and second stage pressurizations is generally 0.2 - 6 MPa, the first conical pressure regulating part 5141 is set as a damping type regulating valve, and the first conical pressure regulating part 5141 has at least one gas groove 51411 arranged circumferentially, which is beneficial to reducing air resistance and increasing the flow rate.

[0027] Please continue to refer to Figure 3 、 Figure 6 、 Figure 7 The secondary pressure regulating mechanism 52 has a fourth flow channel 521, a fifth flow channel 522, and a sixth flow channel 523 arranged between the fourth flow channel 521 and the fifth flow channel 522; the secondary pressure regulating mechanism 52 includes a second pressure regulating valve 524; the second pressure regulating valve 524 includes a second conical pressure regulating part 5241 arranged in the sixth flow channel 523 and a second control part 5242 arranged at one end of the second conical pressure regulating part 5241. Since the pressure of the liquid CO2 medium is generally 6 - 40 MPa during the third and fourth - stage pressurization, the CO2 medium in this state belongs to a compressible liquid, and the CO2 medium may enter the supercritical state during the fourth - stage pressurization. The use of the second conical pressure - regulating part 5241 can make the variable volume and the values of the CO2 pressure and density meet the requirements for the transportation of the liquid CO2 medium.

[0028] Please continue to refer to Figure 2 、 Figure 4 、 Figure 8 wherein the gaseous valve group 22 includes a first valve body 221, a planar liquid - discharging valve plate 222 arranged on one side of the first valve body 221, a planar liquid - inlet valve plate 223 arranged on the other side of the first valve body 221, a first exhaust air flow channel 224 arranged on the first valve body 221 and controlled by the planar liquid - discharging valve plate 222, and a first inlet air flow channel 225 arranged on the first valve body 221 and controlled by the planar liquid - inlet valve plate 223.

[0029] Please continue to refer to Figure 3 、 Figure 9 wherein the liquid valve group 32 includes a second valve body 321, a spherical liquid - discharging valve plate 322 arranged on one side of the second valve body 321, a spherical liquid - inlet valve plate 323 arranged on the other side of the second valve body 321, a second liquid - discharging flow channel 324 arranged on the second valve body 321 and controlled by the spherical liquid - discharging valve plate 322, and a second liquid - inlet flow channel 325 arranged on the second valve body 321 and controlled by the spherical liquid - inlet valve plate 323; Both the spherical liquid - discharging valve plate 322 and the spherical liquid - inlet valve plate 323 include spherical valve cores.

[0030] Through the structural design of the gaseous valve group 22, the gaseous valve group 22 can, driven by the piston, suck in the CO2 medium from the first intake air flow channel 225 through the opening and closing of the planar liquid intake valve plate 223, and discharge the CO2 medium from the first exhaust air flow channel 224 through the opening and closing of the planar liquid discharge valve plate 222. With such a setting, the gaseous valve group 22 can cooperate with both the liquid intake manifold 24 or the connecting manifold 4 that can supply the inhaled CO2 medium and the primary pressure regulating mechanism 51 or the secondary pressure regulating mechanism 52 that requires the input of the CO2 medium, without the need to set up two sets of valve groups, making the volume of the present invention smaller and the cost lower. Through the structural design of the liquid valve group 32, the liquid valve group 32 can, driven by the piston, suck in the CO2 medium from the second intake liquid flow channel 325 through the opening and closing of the spherical liquid intake valve plate 323, and discharge the CO2 medium from the second liquid discharge flow channel 324 through the opening and closing of the spherical liquid discharge valve plate 322. With such a setting, the liquid valve group 32 can cooperate with both the primary pressure regulating mechanism 51 or the secondary pressure regulating mechanism 52 that can supply the inhaled CO2 medium and the connecting manifold 4 or the liquid discharge manifold 34 that requires the input of the CO2 medium, without the need to set up two sets of valve groups, making the volume of the present invention smaller and the cost lower.

[0031] It is worth mentioning that in Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 ,the structures of the first intake air flow channel 225 and the second intake liquid flow channel 325 are shown in partial cross-sectional views to facilitate the understanding of the working principles of the gaseous valve group 22 and the liquid valve group 32.

[0032] Please continue to refer to Figures 1 - 5 ,wherein the horizontal piston assembly 23 includes a horizontal piston rod 231 and a horizontal piston head 232; the horizontal piston head 232 reciprocates between the two gaseous valve groups 22 arranged front and back; the vertical piston assembly 33 includes a vertical piston rod 331 and a vertical piston head 332; the vertical piston head 332 reciprocates between the two liquid valve groups 32.

[0033] It can be understood that the gaseous CO2 medium is sucked in from the liquid intake manifold 24 through the first intake air flow channel 225 of the gaseous valve group 22 arranged in the front position; the gaseous valve group 22 arranged in the front position forms a primary pressure boost when pressing the gaseous CO2 medium into the first flow channel 511, and the gaseous CO2 medium after the primary pressure boost enters the second flow channel 512 through the first pressure regulating valve 514, and forms a secondary pressure boost when being pressed into the connecting manifold 4 from the gaseous valve group 22 arranged in the rear position during the reciprocating movement of the horizontal piston head 232; the CO2 medium entering the connecting manifold 4 after the secondary pressure boost turns into a liquid state.

[0034] Furthermore, please continue to refer to Figure 8The gaseous CO2 medium is transported using a flat discharge valve plate 222 and a flat inlet valve plate 223, which have the advantages of light valve plate weight, small opening and closing load, no lag, and strong anti-gas resistance, and are suitable for transporting gaseous CO2 medium.

[0035] It can be understood that the liquid CO2 medium is sucked from the connecting manifold 4 through the second liquid inlet channel 325 of the liquid valve group 32 arranged at the upper position; the liquid valve group 32 arranged at the upper position forms a three-stage pressurization when pressing the liquid CO2 medium into the fourth channel 521, and the liquid CO2 medium after the three-stage pressurization enters the fifth channel 522 through the second pressure regulating valve 524, and forms a four-stage pressurization when being pressed into the discharge manifold 34 from the liquid valve group 32 arranged at the lower position during the reciprocating motion of the vertical piston head 332.

[0036] For further information, please refer to Figure 9 The liquid CO2 medium is transported using a spherical discharge valve plate 322 and a spherical inlet valve plate 323, and both include a spherical valve core; since the liquid CO2 medium is a compressible liquid, the spherical valve plate has a light weight, and the spherical valve core can also automatically swing to change the sealing surface, thereby achieving better anti-leakage and airtight effects, and is suitable for transporting liquid CO2 medium.

[0037] Please continue reading Figure 2 , Figure 3 The side wall of the horizontal pump body 21 has a first cooling hole 211, and the first cooling hole 211 and the primary pressure regulating mechanism 51 jointly control the state of the CO2 medium in the horizontal hydraulic end 2, so that the CO2 medium entering the connecting manifold 4 is converted into a liquid state; the side wall of the vertical pump body 31 has a second cooling hole 311, and the second cooling hole 311 and the secondary pressure regulating mechanism 52 jointly control the state of the CO2 medium in the vertical hydraulic end 3.

[0038] When in use, a circulating coolant is passed through the first cooling hole 211 and the second cooling hole 311 through a chiller to control the temperature of the horizontal pump body 21 and the vertical pump body 31, thereby maintaining the CO2 medium in the horizontal pump body 21 in a gaseous state and the CO2 medium in the vertical pump body 31 in a liquid state.

[0039] Please continue reading Figure 1 , Figure 2 , wherein the power end 1 includes a connected rotating assembly 11 and a body 12, and a double positioning sleeve 13 arranged at the front end of the body 12; the double positioning sleeve 13 includes an outer shell 131 and a wear-resistant sleeve 132 coaxially arranged inside the outer shell 131; the connected rotating assembly 11 includes a rack shaft 111, and the front end of the rack shaft 111 reciprocates in the wear-resistant sleeve 132.

[0040] When in use, the outer shell 131 of the double positioning sleeve 13 is fixed to the fuselage 12, and a concentrically arranged wear-resistant sleeve 132 is added in the outer shell 131, so that the rack shaft 111 can maintain good concentricity in the wear-resistant sleeve 132 during the axial reciprocating motion, thereby making the horizontal piston rod 231 connected to the rack shaft 111 maintain good concentricity during the axial reciprocating motion, and the horizontal piston head 232 moves in a straight line without eccentric wear; in addition, since the vertical piston rod 331 will give the rack shaft 111 a radial force, through the setting of the wear-resistant sleeve 132 that is not easy to wear, the aforementioned radial force is applied to the wear-resistant sleeve 132, which is beneficial to increase the service life of the present invention.

[0041] Please continue reading Figure 1 , Figure 10 , wherein the one-piece rotating assembly 11 includes a half-tooth cam 112 driven by the rack shaft 111 to reciprocate; the front end of the rack shaft 111 is connected to the rear end of the horizontal piston rod 231, so that the back-and-forth reciprocating motion of the rack shaft 111 drives the horizontal piston head 232 to reciprocate between the two gas valve groups 22 arranged in front and behind through the horizontal piston rod 231; the lower end of the vertical piston rod 331 is connected to the half-tooth cam 112, so that the rotational reciprocating motion of the half-tooth cam 112 drives the vertical piston head 332 to reciprocate between the two liquid valve groups 32 through the vertical piston rod 331; Specifically, the rack shaft 111 reciprocates along its axis driven by the power component of the power end 1. During the reciprocating motion of the rack shaft 111, since the front end of the rack shaft 111 is connected to the rear end of the horizontal piston rod 231, the horizontal piston rod 231 and the rack shaft 111 reciprocate along their axes synchronously. At the same time, the half-tooth cam 112 rolls back and forth along the rack shaft 111 during the reciprocating motion of the rack shaft 111. Therefore, under the back and forth rolling of the half-tooth cam 112, the vertical piston rod 331 connected to the half-tooth cam 112 can reciprocate along its axis.

[0042] Furthermore, when the rack shaft 111 moves forward, the horizontal piston rod 231 drives the horizontal piston head 232 to move toward the gas valve group 22 set in the front position. At this time, the gaseous CO2 medium at the front end of the horizontal pump body 21 is pressed into the first flow channel 511 from the gas valve group 22 set in the front position, and the gaseous CO2 medium in the second flow channel 512 is sucked into the rear end of the horizontal pump body 21 through the gas valve group 22 set in the rear position; at the same time, the vertical piston rod 331 drives the vertical piston head 332 to move toward the liquid valve group 32 set in the upper position. At this time, the liquid CO2 medium at the upper end of the vertical pump body 31 is pressed into the fourth flow channel 521 from the liquid valve group 32 set in the upper position, and the liquid CO2 medium in the fifth flow channel 522 enters and is sucked into the lower end of the vertical pump body 31 through the liquid valve group 32 set in the lower position.

[0043] When the rack shaft 111 moves backward, the horizontal piston rod 231 drives the horizontal piston head 232 towards the gaseous valve group 22 arranged at the rear position. At this time, the gaseous CO2 medium in the liquid inlet manifold 24 is inhaled into the front end inside the horizontal pump body 21 through the gaseous valve group 22 arranged at the front position, and the gaseous CO2 medium at the rear end inside the horizontal pump body 21 is pressed into the connecting manifold 4 through the gaseous valve group 22 arranged at the rear position; meanwhile, the vertical piston rod 331 drives the vertical piston head 332 towards the liquid valve group 32 arranged at the lower position. At this time, the liquid CO2 medium in the connecting manifold 4 is inhaled into the upper end inside the vertical pump body 31 through the liquid valve group 32 arranged at the upper position, and the liquid CO2 medium at the lower end inside the vertical pump body 31 is pressed into the liquid discharge manifold 34 through the liquid valve group 32 arranged at the lower position.

[0044] The stroke of the rack shaft 111 driving the horizontal piston rod 231 is L1. At the L1 stroke, the gaseous CO2 medium turns to the liquid state when entering the connecting manifold 4; The stroke of the semi-tooth cam 112 driving the vertical piston rod 331 is L2. At the L2 stroke, the liquid CO2 medium enters the liquid discharge manifold 34.

[0045] Specifically, the two gaseous valve groups 22 arranged front and back are arranged at fixed positions inside the horizontal pump body 21, and there is a space left between them for the horizontal piston head 232 to reciprocate. The horizontal piston rod 231 passes through the gaseous valve group 22 arranged at the rear position to drive the horizontal piston head 232 to reciprocate in the above-mentioned space; during the reciprocating movement of the horizontal piston head 232, it can cooperate with the two gaseous valve groups 22 arranged front and back respectively. With this setting, the horizontal hydraulic end 2 has two-stage pressurization, and each stage of pressurization can be completed with a smaller stroke and power, which is beneficial to reducing the difficulty of pressurization and reducing the size of the equipment. In addition, the single horizontal piston head 232 cooperates with the two gaseous valve groups 22 arranged front and back through reciprocating movement, which is beneficial to reducing the number of parts, improving the utilization rate of the equipment, making the size of the equipment smaller, and reducing the floor area and manufacturing cost; moreover, the horizontal pump body 21 regulates the pressure of the CO2 medium under the first and second-stage pressurization through the primary pressure regulating mechanism 51, and regulates the temperature of the CO2 medium under the first and second-stage pressurization through the first cooling hole 211. Combining with the stroke of the horizontal piston rod 231 being L1, it can more accurately make the gaseous CO2 medium turn to the liquid state when entering the connecting manifold 4; Specifically, the two liquid valve groups 32 arranged vertically are set at fixed positions inside the vertical pump body 31, with a space left between them for the reciprocating movement of the vertical piston head 332. The vertical piston rod 331 passes through the liquid valve group 32 to drive the vertical piston head 332 to reciprocate in the aforementioned space. During the reciprocating movement of the vertical piston head 332, it can cooperate with the two liquid valve groups 32 arranged vertically respectively. With this setting, the vertical hydraulic end 3 has two-stage pressurization, and each stage of pressurization can be completed with a smaller stroke and power, which is beneficial to reducing the difficulty of pressurization and the size of the equipment. In addition, the vertical piston head 332 cooperates with the two liquid valve groups 32 arranged vertically through reciprocating movement, which is beneficial to reducing the number of parts, improving the utilization rate of the equipment, making the size of the equipment smaller, and reducing the floor area and manufacturing cost. Moreover, the vertical pump body 31 regulates the pressure of the CO2 medium under the third and fourth stage pressurizations through the secondary pressure regulating mechanism 52, and regulates the temperature of the CO2 medium under the third and fourth stage pressurizations through the second cooling hole 311. With the stroke of the vertical piston rod 331 being L2, the output pressure of the liquid CO2 medium can be made to reach the set value more accurately.

[0046] Please continue to refer to Figure 11 , which shows the CO2 medium data measured during each stage of pressurization under the fourth stage of pressurization in some embodiments; among them, Point A is the CO2 medium data measured during the first stage of pressurization. Under the combined control of the primary pressure regulating mechanism 51, the first cooling hole 211, and the L1 stroke of the horizontal piston rod 231, the pressure of the CO2 medium is 0.2 MPa, the temperature is -20 °C, and the state is gaseous at this time; Point B is the CO2 medium data measured during the second stage of pressurization. Under the combined control of the primary pressure regulating mechanism 51, the first cooling hole 211, and the L1 stroke of the horizontal piston rod 231, the pressure of the CO2 medium is 0.5 MPa, the temperature is 0 °C, and the state is gaseous at this time; Point C is the CO2 medium data measured during the third stage of pressurization. Under the combined control of the secondary pressure regulating mechanism 52, the second cooling hole 311, and the L2 stroke of the vertical piston rod 331, the pressure of the CO2 medium is 20 MPa, the temperature is 20 °C, and the state is liquid at this time; Point D is the CO2 medium data measured during the fourth stage of pressurization. Under the combined control of the secondary pressure regulating mechanism 52, the second cooling hole 311, and the L2 stroke of the vertical piston rod 331, the pressure of the CO2 medium is 40 MPa, the temperature is 31.1 °C, and the state is supercritical state at this time.

[0047] It is worth mentioning that the fourth stage of pressurization is not an evenly divided average pressurization, but is distinguished according to the property differences between gaseous CO2 medium and liquid CO2 medium. Figure 11For the embodiment shown, the black curve is the state change curve of the CO2 medium, the green broken line is the parameter change line of the CO2 medium in the four-stage pressurization process of the present invention, and point E is the intersection of the black curve and the green broken line, that is, at point E, the CO2 medium changes from gas to liquid, and point E is in the connecting manifold 4; It can be seen that the pressure increase of the first and second stage boosting is smaller, so as to control the CO2 medium to reach a liquid state when entering the connecting manifold 4, and the pressure increase of the third and fourth stage boosting is larger, so as to control the CO2 medium to reach the pressure requirement when it is output. Correspondingly, the hydraulic end material, wall thickness, flow channel, stroke and other parameters used in the first and second stage boosting and the third and fourth stage boosting are different.

[0048] Please continue to refer to the figure, wherein the body 12 includes a support bracket 121 ; the support bracket 121 is disposed on a side of the rack shaft 111 away from the half-tooth cam 112 .

[0049] Specifically, since the present invention provides a horizontal hydraulic end 2 in the axial direction of the rack shaft 111 and a vertical hydraulic end 3 in the radial direction of the rack shaft 111, the rack shaft 111 is subjected to forces in both the radial and axial directions; in the axial direction, the rack shaft 111 is limited by a double positioning sleeve 13 provided at one end and a positioning plate 14 at the other end to ensure that the rack shaft 111 stably drives the horizontal piston rod 231; in the radial direction, the teeth on the top of the rack shaft 111 mesh with the teeth of the half-tooth cam 112, so that the rack shaft 111 is subjected to forces in both the radial and axial directions. The force of 12 is exerted on the rack shaft 111 through the support bracket 121 away from one side of the half-tooth cam 112, so that the rack shaft 111 has a supporting force against the half-tooth cam 112 on the other side. Under this arrangement, it can prevent the middle part of the rack shaft 111 from being deformed and the meshing failure of the half-tooth cam 112, and can cooperate with the double positioning sleeve 13 and the positioning plate 14 to ensure the stability of the axial movement of the rack shaft 111, so that the scheme of the present invention that uses a set of reciprocating motion of the connected rotating assembly 11 to simultaneously drive the horizontal hydraulic end 2 and the vertical hydraulic end 3 to work can be stably implemented.

[0050] Please continue reading Figure 1 , which also includes a pressure gauge 7; the pressure gauge 7 is arranged at at least one of the connecting manifold 4, the air intake manifold 24, the liquid discharge manifold 34, the primary pressure regulating mechanism 51 and the secondary pressure regulating mechanism 52; by setting at least one pressure gauge 7, the user can obtain the pressure data of the CO2 medium at various positions of the present invention, so as to ensure that the present invention stably pressurizes the CO2 medium to an appropriate value.

[0051] The above description is only for the best embodiments of the present invention and should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A multistage supercharged dual-state CO2 medium reciprocating pump, characterized in that: It includes a power end (1), a horizontal hydraulic end (2) arranged at the front end of the power end (1), a vertical hydraulic end (3) arranged above the power end (1), a connecting manifold (4) connected between the horizontal hydraulic end (2) and the vertical hydraulic end (3), and a pressure regulating assembly (5); The horizontal hydraulic end (2) includes a horizontal pump body (21), two gaseous valve groups (22) arranged front and back in the horizontal pump body (21), a horizontal piston assembly (23) driven by the power end (1) to reciprocate between the two gaseous valve groups (22), and an air inlet manifold (24); The vertical hydraulic end (3) includes a vertical pump body (31), two liquid valve groups (32) arranged up and down in the vertical pump body (31), a vertical piston assembly (33) driven by the power end (1) to reciprocate between the two liquid valve groups (32), and a liquid discharge manifold (34); The pressure regulating assembly (5) includes a primary pressure regulating mechanism (51) and a secondary pressure regulating mechanism (52); When the gaseous CO2 medium enters the horizontal hydraulic end (2) from the air inlet manifold (24) and the horizontal piston assembly (23) moves towards the gaseous valve group (22) at the front position, the gaseous CO2 medium is pressed into the primary pressure regulating mechanism (51) for primary pressurization; when the horizontal piston assembly (23) moves towards the gaseous valve group (22) at the back position, the gaseous CO2 medium is pressed into the connecting manifold (4) for secondary pressurization, and the primary pressure regulating mechanism (51) adjusts the pressure to make the CO2 medium entering the connecting manifold (4) turn into a liquid state; when the liquid CO2 medium enters the vertical hydraulic end (3) from the connecting manifold (4) and the vertical piston assembly (33) moves towards the liquid valve group (32) at the upper position, the liquid CO2 medium is pressed into the secondary pressure regulating mechanism (52) for tertiary pressurization; when the vertical piston assembly (33) moves towards the liquid valve group (32) at the lower position, the liquid CO2 medium is pressed into the liquid discharge manifold (34) for quaternary pressurization.

2. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 1, wherein: The primary pressure regulating mechanism (51) has a first flow channel (511), a second flow channel (512), and a third flow channel (513) arranged between the first flow channel (511) and the second flow channel (512); the primary pressure regulating mechanism (51) includes a first pressure regulating valve (514); the first pressure regulating valve (514) includes a first conical pressure regulating part (5141) arranged in the third flow channel (513) and a first control part (5142) arranged at one end of the first conical pressure regulating part (5141); the first conical pressure regulating part (5141) has at least one air groove (51411) arranged circumferentially; The secondary pressure regulating mechanism (52) has a fourth flow channel (521), a fifth flow channel (522), and a sixth flow channel (523) disposed between the fourth flow channel (521) and the fifth flow channel (522); the secondary pressure regulating mechanism (52) includes a second pressure regulating valve (524); the second pressure regulating valve (524) includes a second conical pressure regulating portion (5241) disposed in the sixth flow channel (523) and a second control portion (5242) disposed at one end of the second conical pressure regulating portion (5241).

3. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 2, characterized in that: The gaseous valve group (22) includes a first valve body (221), a planar liquid discharge valve plate (222) disposed on one side of the first valve body (221), a planar liquid inlet valve plate (223) disposed on the other side of the first valve body (221), a first exhaust flow channel (224) disposed in the first valve body (221) and controlled by the planar liquid discharge valve plate (222), and a first intake air flow channel (225) disposed in the first valve body (221) and controlled by the planar liquid inlet valve plate (223).

4. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 2, characterized in that: The liquid valve group (32) includes a second valve body (321), a spherical liquid discharge valve plate (322) disposed on one side of the second valve body (321), a spherical liquid inlet valve plate (323) disposed on the other side of the second valve body (321), a second liquid discharge flow channel (324) disposed in the second valve body (321) and controlled by the spherical liquid discharge valve plate (322), and a second liquid inlet flow channel (325) disposed in the second valve body (321) and controlled by the spherical liquid inlet valve plate (323); Both the spherical liquid discharge valve plate (322) and the spherical liquid inlet valve plate (323) include spherical valve cores.

5. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 1, wherein: The horizontal piston assembly (23) includes a horizontal piston rod (231) and a horizontal piston head (232); the horizontal piston head (232) reciprocates between two of the gaseous valve groups (22) arranged front and back; the vertical piston assembly (33) includes a vertical piston rod (331) and a vertical piston head (332); the vertical piston head (332) reciprocates between the two liquid valve groups (32).

6. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 1, wherein: The side wall of the horizontal pump body (21) has a first cooling hole (211), and the first cooling hole (211) and the primary pressure regulating mechanism (51) jointly control the state of the CO2 medium in the horizontal hydraulic end (2) so that the CO2 medium entering the connecting pipe manifold (4) turns into a liquid state; the side wall of the vertical pump body (31) has a second cooling hole (311), and the second cooling hole (311) and the secondary pressure regulating mechanism (52) jointly control the state of the CO2 medium in the vertical hydraulic end (3).

7. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 5, characterized in that: The power end (1) comprises a connected rotating assembly (11) and a body (12), and a double positioning sleeve (13) arranged at the front end of the body (12); the double positioning sleeve (13) comprises an outer shell (131) and a wear-resistant sleeve (132) coaxially arranged inside the outer shell (131); the connected rotating assembly (11) comprises a rack shaft (111), and the front end of the rack shaft (111) reciprocates in the wear-resistant sleeve (132).

8. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 7, characterized in that: The integrated rotating assembly (11) comprises a half-tooth cam (112) driven by the rack shaft (111) to reciprocate; the front end of the rack shaft (111) is connected to the rear end of the horizontal piston rod (231), so that the front and rear reciprocating motion of the rack shaft (111) drives the horizontal piston head (232) to reciprocate between two gas valve groups (22) arranged in front and behind through the horizontal piston rod (231); the lower end of the vertical piston rod (331) is connected to the half-tooth cam (112), so that the rotational reciprocating motion of the half-tooth cam (112) drives the vertical piston head (332) to reciprocate between the two liquid valve groups (32) through the vertical piston rod (331); The rack shaft (111) drives the horizontal piston rod (231) to a stroke of L1. At the stroke of L1, the gaseous CO2 medium is converted into a liquid state when entering the connecting manifold (4); The stroke of the vertical piston rod (331) driven by the half-tooth cam (112) is L2. At the stroke of L2, the liquid CO2 medium enters the liquid discharge manifold (34).

9. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 8, characterized in that: The body (12) comprises a supporting bracket (121); the supporting bracket (121) is arranged on a side of the rack shaft (111) away from the semi-tooth cam (112).

10. The multi-stage supercharged dual-state CO2 medium reciprocating pump according to claim 1, characterized in that: It also includes a pressure gauge (7); the pressure gauge (7) is arranged at at least one of the connecting manifold (4), the air intake manifold (24), the liquid discharge manifold (34), the primary pressure regulating mechanism (51), and the secondary pressure regulating mechanism (52).

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