Double-acting reciprocating type supercritical carbon dioxide fluid circulation booster pump fluid end

Abstract

The utility model relates to a double-acting reciprocating type supercritical carbon dioxide fluid circulation booster pump fluid end, and relates to the field of booster pump equipment, the double-acting reciprocating type supercritical carbon dioxide fluid circulation booster pump fluid end comprises a first cylinder body and a second cylinder body, the first cylinder body is installed on a machine box, a liquid inlet and a liquid outlet are formed in the first cylinder body, and two valve cavities are formed in the first cylinder body; the two valve cavities communicate with the liquid inlet and the liquid outlet, a first valve assembly corresponding to the liquid outlet and a second valve assembly corresponding to the liquid inlet are arranged in each valve cavity, a liquid inlet channel communicating with the valve cavities is formed in the cylinder body, and the second cylinder body and the first rod body are arranged in the same structure. The first cylinder body and the second cylinder body are detachably connected through the liquid passing assembly and communicate with liquid inlet channels formed in the first cylinder body and the second cylinder body, the end, connected with the piston, of the piston rod penetrates through the first cylinder body and extends into the liquid passing assembly, and the piston is slidably connected into the liquid passing assembly and is in sealed connection with the liquid passing assembly. The hydraulic cylinder has the effect that the piston and devices in the cylinder body can be conveniently disassembled, assembled and overhauled.

Description

Technical Field

[0001] The present application relates to the field of booster pump equipment, and in particular to a hydraulic end of a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump. Background Art

[0002] High-pressure supercritical fluid circulation systems have been widely used in chemical industry, energy and other fields due to their high efficiency and environmental protection characteristics. In order to ensure the stable operation of the system, maintaining the pressure of the supercritical fluid is one of the key links. However, existing boosting devices often find it difficult to meet this demand, especially under continuous working conditions. There are currently two main methods of boosting: one is to use a single-cylinder single-acting pump, which uses a single piston to complete the suction and discharge process within one stroke cycle; the other is to use a multi-stage series pump to increase the fluid pressure step by step through multiple pump units. Although these methods can achieve the boosting function to a certain extent, they have significant limitations in actual application. The Chinese invention patent with application number CN200304025.5 discloses a reciprocating supercritical fluid circulation booster pump, which drives the piston rod to move by a driving motor, and the piston rod drives the piston to move in the liquid inlet channel in the cylinder body, so that negative pressure is generated in the liquid inlet channel, the volume of the front end of the piston increases, the fluid is input from the liquid inlet, the second valve assembly opens, and the fluid flows into the liquid inlet channel. When the driving motor pushes the piston forward, the piston pushes the fluid into the valve cavity, the first valve assembly opens, and the fluid is discharged from the discharge port; the driving motor drives the piston to push the fluid, so that mechanical energy is converted into fluid pressure, thereby pressurizing the fluid and increasing the pressure of the fluid output. At the same time, during the reciprocating movement of the piston, the states in the two valve cavities are opposite, and the fluid is fed and output in turn. However, since the cylinder body needs to be sealed, after the piston is installed in the cylinder body and used for a period of time, it is more troublesome to disassemble and repair the piston and the device in the cavity. Utility Model Content

[0003] In order to facilitate the disassembly, assembly and maintenance of the piston and the devices in the cylinder, the present application provides a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end.

[0004] The present application provides a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump with a hydraulic end that adopts the following technical solution:

[0005] A double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end, including a drive motor, a chassis, a piston rod and a piston, a crankshaft installed in the chassis, the drive motor output shaft is connected to the crankshaft output end installed in the chassis, one end of the piston rod is connected to the crankshaft output end, driving the piston rod to reciprocate, the piston is installed at the end of the piston rod away from the chassis, and also includes a first cylinder body and a second cylinder body, the first cylinder body is installed on the chassis, and a liquid inlet and a liquid outlet are opened in the first cylinder body. Two valve chambers are provided in the first cylinder body, and both valve chambers are communicated with the liquid inlet and the liquid discharge port. Each valve chamber is provided with a first valve assembly corresponding to the liquid discharge port and a second valve assembly corresponding to the liquid inlet. A liquid inlet channel communicating with the valve chamber is provided in the cylinder body. The second cylinder body has the same structure as the first rod body. The first cylinder body and the second cylinder body are detachably connected through a liquid passage assembly and are connected to the liquid inlet channels opened on the two. The piston rod is connected to the piston at one end and passes through the first cylinder body and extends into the liquid passage assembly. The piston is slidably connected in the liquid passage assembly and is sealed with the liquid passage assembly.

[0006] By adopting the above technical solution, the first cylinder body and the second cylinder body are detachably connected through the liquid-passing assembly, and the piston is slidably connected in the liquid-passing assembly, so that the first cylinder body and the second cylinder body can be separated by removing the liquid-passing assembly, which facilitates the inspection and maintenance of the piston and the devices in the first cylinder body and the second cylinder body; at the same time, driven by the driving motor, the piston rod drives the piston to reciprocate in the liquid-passing assembly between the first cylinder body and the second cylinder body through the crankshaft. Since the piston is slidably connected in the liquid-passing assembly and is sealed with the liquid-passing assembly, alternating liquid intake and discharge are achieved in the two cylinder bodies, thereby providing a continuous and stable boosting effect.

[0007] In a specific possible implementation scheme, the liquid flow assembly includes a sealing cylinder sleeve, the inner diameter of the sealing cylinder sleeve is set to correspond to the piston diameter, and the inner wall is set to be smooth, and the first cylinder body and the second cylinder body are both provided with mounting grooves, and the two ends of the sealing cylinder sleeve are respectively installed in the mounting grooves of the first cylinder body and the second cylinder body.

[0008] By adopting the above technical solution, the inner diameter of the sealing cylinder sleeve in the liquid-passing assembly matches the diameter of the piston, and the inner side wall is smoothly arranged, so that the piston can smoothly reciprocate in the sealing cylinder sleeve, thereby improving the stability and efficiency of the piston movement; at the same time, the two ends of the sealing cylinder sleeve are respectively installed in the mounting grooves of the first cylinder body and the second cylinder body, thereby enhancing the connection stability between the sealing cylinder sleeve and the cylinder body, and ensuring the sealing performance of the entire system.

[0009] In a specific possible implementation scheme, the liquid flow assembly also includes a positioning rod and a positioning nut. The positioning rod is arranged to pass through the first cylinder body and the second cylinder body, and the length direction of the positioning rod is arranged to correspond to the movement direction of the piston rod. There are several positioning nuts, and the positioning nuts are threadedly connected to the positioning rod, and the several positioning nuts are respectively tightened on the side wall of the first cylinder body adjacent to the second cylinder body and the side wall of the second cylinder body away from the first cylinder body.

[0010] By adopting the above technical solution, the setting of the positioning rod and the positioning nut enables the first cylinder body and the second cylinder body to be accurately fixed in the direction of movement of the piston rod, thereby improving the overall stability of the cylinder body structure and ensuring the precise positioning of the piston rod during the reciprocating motion, thereby improving the operating efficiency and reliability of the booster pump.

[0011] In a specific feasible implementation scheme, the first valve assembly includes an upper plug, a drain valve cover and a drain valve seat which are arranged in sequence along the axis of the cylinder body and abut against each other, the side wall of the drain valve cover is provided with a plurality of first through holes which are connected to the interior, the inner wall of the valve cavity is provided with a first annular groove corresponding to each first through hole, the upper end of the drain valve seat is inserted into the drain valve cover, and a drain valve core for closing is inserted into the drain valve seat, and a drain spring is connected between the drain valve core and the drain valve cover.

[0012] In a specific possible implementation scheme, the second valve assembly includes a liquid inlet valve cover and a liquid inlet valve seat arranged in sequence along the axis of the cylinder body and abutting against each other, the side wall of the liquid inlet valve cover is provided with a plurality of second through holes connected to the interior, the second through holes are connected to the liquid inlet channel, the upper end of the liquid inlet valve seat is inserted into the liquid inlet valve cover, and the liquid inlet valve seat is provided with a liquid inlet valve core for sealing, and the liquid inlet valve core is connected to the liquid inlet valve cover through a liquid inlet spring.

[0013] In a specific possible implementation scheme, it also includes a sealing assembly, which is installed on the surface of the first cylinder body facing away from the second cylinder body. The sealing assembly includes a pressure plate and a stuffing box. The pressure plate is connected to the cylinder body, and the stuffing box is inserted into the pressure plate. The side wall of the cylinder body is provided with a slot for inserting one end of the stuffing box, and the stuffing box is provided with a movable groove for the piston rod to pass through. The wall of the movable groove is provided with a material groove, and two guide sleeves are inserted in the material groove, and the two guide sleeves are filled with sealing filler.

[0014] In a specific embodiment, the end of the stuffing box away from the cylinder body is threadedly connected to an adjusting nut, the end of the adjusting nut abuts against a guide sleeve close to the adjusting nut, and the piston rod passes through the inside of the adjusting nut.

[0015] In a specific feasible implementation scheme, a key sleeve is coaxially provided on the motor shaft of the driving motor, a spline is inserted in the key sleeve, an active disk is fixed to the end of the spline away from the key sleeve, a first disk tooth is provided on the side wall of the active disk, a driven disk is provided on the crankshaft, a second disk tooth is provided on the side wall of the driven disk that meshes with the first disk tooth, and the active disk and the driven disk are connected by a switching assembly.

[0016] In a specific feasible implementation scheme, the switching assembly includes a limit sleeve and a positioning ring, the limit sleeve is fixed on the active disk, and a plurality of slots are circumferentially opened on the end of the limit sleeve away from the active disk, the limit sleeve is rotatably connected to the sleeve at the position corresponding to each slot, and a block is slidably connected to the sleeve, and a guide column is vertically provided on the block, and the guide column passes through the outside of the sleeve along the axis away from the limit sleeve and is connected to a fixed block, and a reset spring is connected to the fixed block and the clamping suite, the block is located on the side of the driven disk away from the active disk, and a wedge-shaped surface is provided on the side of the block away from the active disk; the positioning ring is provided on the limit sleeve, and the positioning ring is fixed to the limit sleeve by a limit screw, and the side wall of the positioning ring is provided with a hook corresponding to the slot one by one, and the clamping sleeve is located on the inner side of the hook.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. By detachably connecting the first cylinder body and the second cylinder body through a fluid passage assembly, and slidingly connecting the piston in the fluid passage assembly, the first cylinder body and the second cylinder body can be separated by removing the fluid passage assembly, thereby facilitating maintenance of the piston and the devices in the first and second cylinder bodies;

[0019] 2. The inner diameter of the sealing cylinder sleeve in the fluid flow assembly matches the piston diameter, and the inner wall is smooth, allowing the piston to reciprocate smoothly within the sealing cylinder sleeve, improving the stability and efficiency of the piston movement. At the same time, the ends of the sealing cylinder sleeve are respectively installed in the mounting grooves of the first and second cylinder bodies, enhancing the stability of the connection between the sealing cylinder sleeve and the cylinder body, and ensuring the sealing performance of the entire system.

[0020] 3. The setting of the positioning rod and the positioning nut enables the first cylinder body and the second cylinder body to be accurately fixed in the direction of movement of the piston rod, thereby improving the overall stability of the cylinder body structure and ensuring the precise positioning of the piston rod during the reciprocating motion, thereby improving the operating efficiency and reliability of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an embodiment of the present application.

[0022] Figure 2 This is a cross-sectional view of an embodiment of the present application.

[0023] Figure 3It is a fracture cross-sectional view showing the connection relationship between the drive motor and the crankshaft in the embodiment of the present application.

[0024] Figure 4 Schematic diagram of the structure of the switching component in the embodiment of the present application.

[0025] Figure 5 This is a broken cross-sectional view of the first cylinder body in the embodiment of the present application.

[0026] Figure 6 for Figure 2 Enlarged view of part A.

[0027] Explanation of reference numerals: 1. driving motor; 2. chassis; 21. crankshaft; 3. piston rod; 4. piston; 5. first cylinder; 51. liquid inlet; 52. liquid discharge; 53. valve chamber; 6. second cylinder; 7. first valve assembly; 71. upper plug; 72. liquid discharge valve cover; 73. liquid discharge valve seat; 74. liquid discharge valve core; 75. liquid discharge spring; 8. second valve assembly; 81. liquid inlet valve cover; 82. liquid inlet valve seat; 83. liquid inlet valve core; 84. Liquid inlet spring; 9. Flange plate; 10. Key sleeve; 11. Spline; 12. Active disc; 13. Driven disc; 14. Switching assembly; 141. Limit sleeve; 142. Locating ring; 143. Clamping sleeve; 144. Block; 145. Guide post; 146. Return spring; 147. Hook; 15. Liquid flow assembly; 151. Sealing cylinder sleeve; 152. Locating rod; 153. Locating nut; 16. Sealing assembly; 161. Pressure plate; 162. Stuffing box. DETAILED DESCRIPTION

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0030] The embodiment of the present application discloses a hydraulic end of a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump.

[0031] like Figure 1 and Figure 2As shown, the hydraulic end of a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump comprises a drive motor 1, a housing 2, a piston rod 3, and a piston 4. A crankshaft 21 is mounted within the housing 2. The output shaft of the drive motor 1 is connected to the input end of the crankshaft 21, which is mounted within the housing 2. A connecting rod is rotatably connected to the crankshaft 21. The connecting rod's end, distal from the crankshaft 21, is hingedly connected to a power column, which is slidably connected within the housing 2. The piston rod 3 extends into the housing 2 and is connected to the power column. One end of the piston rod 3 is connected to the output end of the crankshaft 21, driving the reciprocating motion of the piston rod 3. There are three power columns, corresponding to three piston rods. The piston 4 is mounted at the end of the piston rod 3 facing away from the housing 2. The pump also comprises a first cylinder 5 and a second cylinder 6. The first cylinder 5 is mounted on the housing 2 and is equipped with a liquid inlet 51, a liquid outlet 52, and six valve chambers 53. The six valve chambers 53 are arranged in three groups, arranged side by side, with the two valve chambers in each group located at the same height. Each valve cavity 53 is connected to the liquid inlet 51 and the liquid discharge port 52. Each valve cavity 53 is provided with a first valve assembly 7 corresponding to the liquid discharge port 52 and a second valve assembly 8 corresponding to the liquid inlet 51. The upper end of the valve cavity 53 is open, and a flange plate 9 is fixed to the cylinder body by bolts. The flange plate 9 closes the upper end opening of the valve cavity 53.

[0032] The cylinder body is provided with a liquid inlet passageway connected to the valve chamber 53. The second cylinder body 6 has the same structure as the first cylinder body 5. The first and second cylinder bodies 5, 6 are connected by a fluid passage assembly, and the liquid inlet passageways of the two are connected. The end of the piston rod 3 connected to the piston 4 extends through the first cylinder body 5 and into the fluid passage assembly. The piston 4 is slidably connected within the fluid passage assembly and is sealed to the fluid passage assembly. This allows for continuous fluid pressurization throughout the entire system. The first valve assembly 7 and the second valve assembly 8 have opposite opening and closing states, and the fluid flows in opposite directions when the first and second cylinder bodies 5, 6 are operating.

[0033] The liquid flow assembly 15 includes a sealing cylinder sleeve 151, a positioning rod 152 and a positioning nut 153. The inner diameter of the sealing cylinder sleeve 151 is set to correspond to the diameter of the piston 4, and the inner wall is set to be smooth. The first cylinder body 5 and the second cylinder body 6 are both provided with mounting grooves. The two ends of the sealing cylinder sleeve 151 are respectively installed in the mounting grooves of the first cylinder body 5 and the second cylinder body 6. The positioning rod 152 is set to pass through the first cylinder body 5 and the second cylinder body 6, and the length direction of the positioning rod 152 is set to correspond to the movement direction of the piston rod 3. There are several positioning nuts 153, which are threadedly connected to the positioning rod, and several positioning nuts 153 are respectively pressed against the side wall of the first cylinder body 5 adjacent to the second cylinder body 6 and the side wall of the second cylinder body 6 away from the first cylinder body 5.

[0034] like Figure 3 and Figure 4As shown, a key sleeve 10 is coaxially provided on the output shaft of the driving motor 1, and a spline 11 is inserted in the key sleeve 10. A driving disc 12 is fixed to the end of the spline 11 extending out of the key sleeve 10. The driving disc 12 is coaxial with the spline 11, and a first disc tooth is provided on the side of the driving disc 12 away from the spline 11. A driven disc 13 is coaxially provided on the end of the input shaft of the reducer, and the driven disc 13 is opposite to the driving disc 12, and a second disc tooth meshing with the first disc tooth is provided on the side of the driven disc 13 away from the crankshaft 21. The driving disc 12 and the driven disc 13 are connected by a switching component 14.

[0035] The switching assembly 14 includes a limiting sleeve 141 and a positioning ring 142. The limiting sleeve 141 is coaxially fixed on the active disk 12 and is located on the outside of the first disk tooth. The limiting sleeve 141 is provided with a plurality of slots arranged equidistantly along its axis on the side away from the active disk 12. The limiting sleeve 141 is rotatably connected to a sleeve 143 at the corresponding position of each slot. The sleeve 143 is inserted into the slot, and a block 144 is slidably connected to the sleeve 143. One end of the block 144 is located in the sleeve 143 and is perpendicular to the center of the sleeve. A guide column 145 is provided, and the guide column 145 passes through the outside of the clamping sleeve 143 in the direction away from the axis of the limit sleeve 141, and the end of the pass-through is connected to a fixed block. A return spring 146 is provided on the guide column 145, and one end of the return spring 146 is connected to the clamping sleeve 143, and the other end is connected to the fixed block. When the return spring 146 is in a natural state, the clamping block 144 partially extends out of the clamping sleeve 143, and the end of the clamping block 144 extending out of the clamping sleeve 143 is provided with a wedge surface on the side away from the active disk 12.

[0036] The positioning ring 142 is sleeved on the limiting sleeve 141, and the positioning ring 142 is fixed to the limiting sleeve 141 by a limiting screw. The side wall of the positioning ring 142 is provided with a hook 147 corresponding to the slot one by one. The hook 147 is L-shaped, and the openings of each hook 147 are distributed in the same clockwise direction. The sleeve 143 is inserted into the hook 147 to limit the rotation of the sleeve 143.

[0037] like Figure 5 As shown, the first valve assembly 7 includes an upper plug 71, a drain valve cover 72 and a drain valve seat 73, which are arranged in sequence along the axis of the valve cavity 53 and abut against each other. The upper plug 71 abuts against the flange plate 9 to seal the upper end opening of the valve cavity 53. The side wall of the drain valve cover 72 is provided with a plurality of circumferentially arranged first through holes, and the inner wall of the valve cavity 53 is provided with first annular grooves corresponding to each first through hole. The first through holes connect the interior of the drain valve cover 72 with the first annular grooves. The upper end of the drain valve seat 73 is inserted into the drain valve cover 72, and the drain valve seat 73 is provided with a vertical through channel, so that the drain valve seat 73 and the interior of the drain valve cover 72 are connected to each other. A drain valve core 74 for closing the internal channel of the drain valve seat 73 is inserted into the drain valve seat 73, and a drain spring 75 is connected between the drain valve core 74 and the drain valve cover 72.

[0038] The second valve assembly 8 includes an inlet valve cover 81 and an inlet valve seat 82 arranged in sequence along the axis of the valve cavity 53. One end of the inlet valve cover 81 abuts against the drain valve seat 73, and the other end is sleeved on the upper end of the inlet valve seat 82. The inlet valve cover 81 is connected up and down, and a plurality of second through holes communicating with the interior of the inlet valve cover 81 are provided on the side wall of the inlet valve cover 81. The second through holes of the two inlet valve covers 81 are both directly connected to the liquid inlet channel. The inlet valve seat 82 is located at the bottom of the valve cavity 53 and above the liquid inlet port 51. A channel communicating with the interior of the inlet valve cover 81 is provided inside the inlet valve seat 82. An inlet valve core 83 for closing the internal channel is inserted into the inlet valve seat 82, and the inlet valve core 83 is connected to the interior of the inlet valve cover 81 through an inlet spring 84.

[0039] In the initial state, the discharge valve seat 73 and the inlet valve seat 82 are both in a closed state. When the driving motor 1 drives the piston rod 3 to move, driving the piston 4 away from the inlet valve cover 81, negative pressure is generated in the inlet channel, the volume at the front end of the piston 4 becomes larger, and the fluid pressure is greater than the internal pressure of the valve chamber 53. The inlet valve core 83 overcomes the elastic force of the inlet spring 84 under the pressure of the fluid and moves upward, opening the inlet valve seat 82, allowing the fluid to flow into the inlet valve cover 81 through the inlet valve seat 82, and then flow into the inlet channel through the second through hole. After the piston 4 stops moving, the pressure inside and outside the valve chamber 53 is the same, and the inlet valve core 83 drives the inlet valve core 83 downward under the pressure of the inlet spring 84, closing the inlet valve seat 82.

[0040] When the driving motor 1 pushes the piston 4 close to the liquid inlet valve cover 81, the piston 4 pushes the fluid in the liquid inlet channel, causing the fluid pressure to increase. The drain valve core 74, pushed by the fluid, overcomes the elastic force of the drain spring 75 and moves upward, opening the drain valve seat 73. The fluid enters the drain valve cover 72 from the drain valve seat 73, and then flows into the first annular groove from each first through hole, and is finally discharged from the drain port 52.

[0041] like Figure 6 As shown, in the embodiment of the present application, a sealing assembly 16 is also included. The sealing assembly 16 includes a pressure plate 161 and a stuffing box 162. A slot for the piston rod 3 to pass through is opened on the side wall of the cylinder body. The slot is connected to the valve chamber 53 and is opposite to the liquid inlet channel. The stuffing box 162 is in the shape of a stepped shaft and is divided into a first shaft section, a second shaft section and a third shaft section along its axis. The outer diameter of the third shaft section is larger than the first shaft section and smaller than the second shaft section. The first shaft section of the stuffing box 162 is inserted into the slot, and the pressure plate 161 is sleeved on the stuffing box 162 and fixed to the cylinder body by screws. At the same time, the internal hole of the pressure plate 161 is adapted to the second shaft section and the third shaft section of the stuffing, and the second shaft section of the stuffing box 162 is pressed against the cylinder body to achieve the fixation of the stuffing box 162.

[0042] Stuffing box 162 has a slot for the piston rod 3 to pass through. A material slot is located on the side of the slot away from the cylinder body. Two spaced-apart guide sleeves are inserted into the slot. Both sleeves fit over the piston rod 3, and a sealing packing is placed between the sleeves. An adjusting nut is threadedly connected to the end of stuffing box 162 away from the cylinder body. The end of the adjusting nut is inserted into the slot and abuts against the guide sleeve adjacent to the adjusting nut, allowing the piston rod 3 to pass through the adjusting nut. The sealing packing forms a seal with the piston rod 3 and ensures its reciprocating motion. The operator can adjust the thrust on the guide sleeves by turning the adjusting nut, which compresses the sealing packing, thereby maintaining a seal against the piston rod 3.

[0043] The implementation principle of the hydraulic end of a double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump in an embodiment of the present application is as follows: the driving motor 1 drives the key sleeve 10 to rotate, the key sleeve 10 drives the active disk 12 to rotate through the spline 11, the active disk 12 drives the driven disk 13 to rotate, and when the driven disk 13 drives the crankshaft 21 to rotate, the crankshaft 21 drives the power column to move back and forth through the connecting rod, and the power column synchronously drives the piston rod 3 to drive the piston 4 to move synchronously in the cylinder sleeve, so that the states in the two valve chambers 53 are switched in turn, thereby realizing continuous pressurization of the system circulation. At the same time, since the first cylinder body 5 and the second cylinder body 6 are detachably connected by a liquid-passing component, the piston 4 is slidably connected to the liquid-passing component, so that the first cylinder body 5 and the second cylinder body 6 can be separated by removing the liquid-passing component, which is convenient for maintenance of the piston 4 and the devices in the first cylinder body 5 and the second cylinder body 6.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end, comprising a drive motor (1), a chassis (2), a piston rod (3) and a piston (4), wherein a crankshaft (21) is installed in the chassis (2), the output shaft of the drive motor (1) is connected to the output end of the crankshaft (21) installed in the chassis (2), one end of the piston rod (3) is connected to the output end of the crankshaft (21), driving the piston rod (3) to reciprocate, and the piston (4) is installed at the end of the piston rod (3) away from the chassis (2), characterized in that: The invention also comprises a first cylinder body (5) and a second cylinder body (6), wherein the first cylinder body (5) and the second cylinder body (6) have the same structure, the first cylinder body (5) is mounted on the chassis (2), and a liquid inlet (51) and a liquid outlet (52) are provided in the first cylinder body (5). Two valve chambers (53) are provided in the first cylinder body (5), and the two valve chambers (53) are both communicated with the liquid inlet (51) and the liquid discharge port (52). Each valve chamber (53) is provided with a first valve assembly (7) corresponding to the liquid discharge port (52) and a second valve assembly (8) corresponding to the liquid inlet (51). The first cylinder body (5) is provided with a liquid inlet channel communicated with the valve chamber (53). The second cylinder body (6) has the same structure as the first cylinder body (5). The first cylinder body (5) and the second cylinder body (6) are detachably connected through a liquid communication assembly (15) and are connected to the liquid inlet channels provided on the two cylinder bodies. One end of the piston rod (3) connected to the piston (4) passes through the first cylinder body (5) and extends into the liquid communication assembly. The piston (4) is slidably connected in the liquid communication assembly (15) and is sealed with the liquid communication assembly (15).

2. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 1, characterized in that: The liquid-passing assembly (15) comprises a sealing cylinder sleeve (151), the inner diameter of the sealing cylinder sleeve (151) being set corresponding to the diameter of the piston (4), and the inner side wall being set smoothly, the first cylinder body (5) and the second cylinder body (6) both being provided with mounting grooves, and the two ends of the sealing cylinder sleeve being respectively mounted in the mounting grooves of the first cylinder body (5) and the second cylinder body (6).

3. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 2, characterized in that: The liquid-passing assembly (15) further includes a positioning rod (152) and a positioning nut (153). The positioning rod (152) is arranged to pass through the first cylinder body (5) and the second cylinder body (6), and the length direction of the positioning rod (152) corresponds to the movement direction of the piston rod (3). A plurality of positioning nuts (153) are provided. The positioning nuts (153) are threadedly connected to the positioning rod (152), and the plurality of positioning nuts (153) are respectively pressed against the side wall of the first cylinder body (5) adjacent to the second cylinder body (6) and the side wall of the second cylinder body (6) away from the first cylinder body (5).

4. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 1, characterized in that: The first valve assembly (7) comprises an upper plug (71), a drain valve cover (72) and a drain valve seat (73) which are arranged in sequence along the axis of the cylinder body and abut against each other. The side wall of the drain valve cover (72) is provided with a plurality of first through holes communicating with the interior. The inner wall of the valve cavity (53) is provided with a first annular groove corresponding to each first through hole. The upper end of the drain valve seat (73) is inserted into the drain valve cover (72), and a drain valve core (74) for sealing is inserted into the drain valve seat (73). A drain spring (75) is connected between the drain valve core (74) and the drain valve cover (72).

5. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 4, characterized in that: The second valve assembly (8) comprises a liquid inlet valve cover (81) and a liquid inlet valve seat (82) which are arranged in sequence along the axis of the cylinder body and abut against each other. The side wall of the liquid inlet valve cover (81) is provided with a plurality of second through holes communicating with the interior. The second through holes are communicated with the liquid inlet channel. The upper end of the liquid inlet valve seat (82) is inserted into the liquid inlet valve cover (81). The liquid inlet valve seat (82) is provided with a liquid inlet valve core (83) for sealing. The liquid inlet valve core (83) is connected to the liquid inlet valve cover (81) via a liquid inlet spring (84).

6. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 1, characterized in that: The invention also includes a sealing component, which is installed on the surface of the first cylinder body (5) on the side facing away from the second cylinder body (6). The sealing component (16) includes a pressure plate (161) and a stuffing box (162). The pressure plate (161) is connected to the cylinder body, and the stuffing box is inserted into the pressure plate (161). The side wall of the first cylinder body (5) is provided with a slot for inserting one end of the stuffing box (162). The stuffing box is provided with a movable groove for the piston rod (3) to pass through. The wall of the movable groove is provided with a material groove. Two guide sleeves are inserted into the material groove, and the space between the two guide sleeves is filled with sealing filler.

7. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 6, characterized in that: An end of the stuffing box (162) away from the cylinder body is threadedly connected to an adjusting nut, an end of the adjusting nut abuts against a guide sleeve close to the adjusting nut, and the piston rod (3) passes through the inside of the adjusting nut.

8. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 1, characterized in that: A key sleeve (10) is coaxially provided on the motor shaft of the driving motor (1), a spline (11) is inserted into the key sleeve (10), a driving disc (12) is fixed to the end of the spline (11) away from the key sleeve (10), a first disc tooth is provided on the side wall of the driving disc (12), a driven disc (13) is provided on the crankshaft (21), a second disc tooth meshing with the first disc tooth is provided on the side wall of the driven disc (13), and the driving disc (12) and the driven disc (13) are connected via a switching assembly (14).

9. The double-acting reciprocating supercritical carbon dioxide fluid circulation booster pump hydraulic end according to claim 8, characterized in that: The switching assembly (14) includes a limiting sleeve (141) and a positioning ring (142). The limiting sleeve (141) is fixed on the active disk (12), and a plurality of slots are circumferentially provided at one end of the limiting sleeve (141) away from the active disk (12). The limiting sleeve (141) is rotatably connected to a sleeve (143) at each corresponding slot position. A block (144) is slidably connected to the sleeve (143). A guide column (145) is vertically provided on the block (144). The guide column (145) passes through the outside of the sleeve (143) along the axis away from the limiting sleeve (141). The fixed block is connected to the fixed block, and the fixed block and the clamping sleeve (143) are connected to a reset spring (146). The clamping block (144) is located on the side of the driven disk (13) away from the active disk (12), and the side of the clamping block (144) away from the active disk (12) is provided with a wedge surface; the positioning ring (142) is sleeved on the limiting sleeve (141), and the positioning ring (142) is fixed to the limiting sleeve (141) by a limiting screw, and the side wall of the positioning ring (142) is provided with a hook (147) corresponding to the clamping groove, and the clamping sleeve (143) is located on the inner side of the hook (147).

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