A CO2 injection pump for petrochemical industry

Abstract

The present invention relates to the technical field of centrifugal pumps, and discloses a CO2 injection pump for petrochemical industry, which comprises a pump body, an input channel, an output channel, a main shaft, an impeller and a motor. The input channel includes an infusion channel and a liquid inlet channel that is connected to the infusion channel in a through manner. The infusion channel is connected to the front end of the pump body in a through manner, and a pressurizing mechanism is arranged in the infusion channel. The pressurizing mechanism includes a rotating disk, an arc-shaped diversion groove, an arc-shaped baffle, a rotating shaft and a diversion vane. The rotating disk is rotatably arranged in the infusion channel. The arc-shaped diversion grooves are equally spaced along the circumferential direction of the rotating disk. The arc-shaped baffle is movably arranged on the rotating disk and can block or open the opening of the arc-shaped diversion groove. In this CO2 injection pump for petrochemical industry, through the arrangement of the pressurizing mechanism, the initial pressurization of the liquid CO2 when it is input into the pump body is carried out, the inlet pressure is maintained above the saturated vapor pressure, the liquid CO2 is prevented from vaporizing to form bubbles, the impeller is protected from erosion, and the service life of the impeller is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a CO2 injection pump for petrochemical industry. Background Art

[0002] In the petrochemical production process, CO2 injection pumps are key equipment, mainly used to transport and inject carbon dioxide (CO2) into specific petrochemical production processes. By injecting CO2 into the oil reservoir, the viscosity of crude oil can be reduced and the fluidity of crude oil can be increased, making it easier to extract the oil that was originally difficult to extract. In specific operations, the CO2 injection pump pressurizes the CO2 from the storage container or production device, transports it to the wellhead of the oil well through a series of pipelines, and then injects the CO2 into the underground oil reservoir through the wellhead device.

[0003] The high-pressure carbon dioxide delivery centrifugal pump disclosed in the existing publication number CN118881564A comprises an outer shell having a pump cavity inside; an intermediate guide body is arranged in the outer shell to separate the pump cavity into a front cavity and a rear cavity; the rear cavity is connected to the downstream of the front cavity; an inlet arranged on the outer shell for introducing a medium; an outlet arranged on the outer shell for outputting a medium; a rotating shaft rotatably passing through the pump cavity; support assemblies for supporting the rotating shaft are respectively arranged at both ends of the outer shell; a multi-stage impeller fixedly connected to the rotating shaft, the multi-stage impeller sequentially including a first-stage impeller, a plurality of intermediate-stage impellers and a final-stage impeller from upstream to downstream, the first-stage impeller is located in the front cavity and is connected to the inlet, and the final-stage impeller is located in the rear cavity and is connected to the outlet; the impeller size gradually decreases from the first-stage impeller to the final-stage impeller. Although the above technical scheme can design the size of the impeller, the impeller size gradually decreases from the first-stage impeller to the final-stage impeller, so that each stage of the impeller can operate at the optimal efficiency point, which has the advantage of improving the efficiency of the centrifugal pump.

[0004] However, in the prior art, there are different working conditions for centrifugal pumps to transport liquid carbon dioxide (CO2). When in a low-flow working state, the motor drives the impeller to rotate at a low speed. At this time, the flow rate of liquid CO2 entering the pump is relatively small. When the delivery flow rate of liquid CO2 needs to be increased from low flow to high flow, it is generally achieved by increasing the motor speed. After the motor speed is increased, the impeller speed increases accordingly. At this time, more liquid CO2 can be transported to meet the requirements of the high-flow working state. In this process, due to the high-speed rotation of the impeller, the flow rate of liquid CO2 near the impeller increases sharply, but the energy obtained at the inlet of the centrifugal pump is insufficient relative to the impeller, resulting in an inlet pressure lower than the pressure near the impeller. When the inlet pressure drops below the saturated vapor pressure of liquid CO2, the liquid CO2 will partially vaporize to form bubbles. The bubbles will quickly burst when flowing with the liquid to the high-pressure area near the impeller, generating local high temperature and high-pressure shocks, eroding the impeller surface, causing pits, cracks and other damage to the impeller surface, greatly shortening the service life of the impeller. Summary of the Invention

[0005] The object of the present invention is to provide a CO2 injection pump for petrochemical industry, so as to solve the problem that when a centrifugal pump transports liquid CO2 and switches between different flow conditions, the inlet pressure is lower than the pressure near the impeller due to the high-speed rotation of the impeller, resulting in the vaporization of liquid CO2 to form bubbles that erode the impeller as mentioned in the above background technology.

[0006] A CO2 injection pump for petrochemical industry provided by the present invention adopts the following technical solutions:

[0007] A CO2 injection pump for petrochemical industry includes a pump body, an input channel, an output channel, a main shaft, an impeller and a motor. The input channel includes an infusion channel and a liquid inlet channel that is connected to the infusion channel in a through manner. The infusion channel is connected to the front end of the pump body in a through manner. A pressurizing mechanism is provided in the infusion channel. The pressurizing mechanism includes a rotating disk, an arc-shaped guide groove, an arc-shaped baffle, a rotating shaft and a guide vane. The rotating disk is rotatably arranged in the infusion channel. The arc-shaped guide grooves are equally spaced along the circumferential direction of the rotating disk. The arc-shaped baffle is movably arranged on the rotating disk and can block or open the opening of the arc-shaped guide groove. The guide vane is rotatably installed on the front side of the arc-shaped baffle.

[0008] When in the low-flow working state, at this time, the arc-shaped baffle blocks part of the opening of the arc-shaped guide groove, restricting the amount of liquid CO2 entering the arc-shaped guide groove, and the guide vane preliminarily guides the liquid CO2 entering the arc-shaped guide groove.

[0009] When it is lifted to the high-flow working state, at this time, the arc-shaped baffle opens, the opening of the arc-shaped guide groove increases, a large amount of liquid CO2 enters the arc-shaped guide groove, and at the same time, the guiding angle of the guide vane is adjusted to pressurize the liquid CO2.

[0010] Further, one end of the arc-shaped baffle close to the center of the rotating disk is rotatably arranged on the rotating disk through a rotating shaft. A sliding column is fixedly arranged on the arc-shaped baffle, and the sliding column slides on the rotating disk. One end of the sliding column away from the arc-shaped baffle is fixedly provided with an engaging block, a spring is arranged on the engaging block, and the other end of the spring is fixedly provided with a positioning block, and the positioning block is fixed on the rotating disk.

[0011] Further, an adaptation groove is opened at one end of the guide vane close to the center of the rotating disk. A fixed shaft is fixed in the adaptation groove. A connecting shaft is fixed on the fixed shaft, and the connecting shaft is rotatably connected to the arc-shaped baffle. A torsion spring is arranged on the connecting shaft, and a convex rod is also fixed on the fixed shaft.

[0012] An engaging arm is fixed on the rotating disk. One end of the engaging arm away from the rotating disk is rotatably connected to a contact wheel through a connecting frame, and the contact wheel and the convex rod cooperate with each other to change the angle of the guide vane.

[0013] Furthermore, the output channel communicates with the top end of the pump body for outputting pressurized liquid CO₂. The main shaft penetrates through the pump body and is rotatable. The impeller is fixedly connected to the main shaft. The motor is used to drive the main shaft to rotate. A driven shaft is fixed at the center of the rotating disc, and the driven shaft is fixedly connected to the main shaft.

[0014] Furthermore, a track cooperating with the sliding column is provided on the rotating disc, and the sliding column slides in the track to realize the movement of the arc-shaped baffle.

[0015] Furthermore, a limiting bar is provided on the arc-shaped baffle, and the limiting bar is used to limit the rotation angle range of the guide vane.

[0016] Furthermore, the shape of the guide vane is narrow at the front end and wide at the rear end.

[0017] Furthermore, a flow guiding mechanism is provided in the liquid inlet channel. The flow guiding mechanism includes a directional conduit. The directional conduit is arranged in the liquid inlet channel, and multiple groups of liquid guiding grooves are provided on the directional conduit.

[0018] Furthermore, multiple groups of liquid guiding grooves are equally spaced along the circumferential direction of the directional conduit, and multiple groups of liquid guiding grooves extend in a spiral form.

[0019] Furthermore, the inner diameter of the front end of the liquid inlet channel is smaller than the inner diameter at the connection of the liquid inlet channel and the liquid delivery channel, and the inner diameter at the connection of the liquid inlet channel and the liquid delivery channel is smaller than the inner diameter of the liquid delivery channel.

[0020] Advantages of the present invention:

[0021] By providing a pressurization mechanism, in the low-flow working state, the arc-shaped baffle blocks part of the opening of the arc-shaped flow guiding groove to limit the amount of liquid CO₂ entering. The guide vane preliminarily guides a small amount of liquid CO₂, enabling it to accelerate and flow in a small space to increase the pressure, meeting the low-flow production requirements. In the high-flow working state, the rotation speed of the rotating disc increases, causing the arc-shaped baffle to open, increasing the opening of the arc-shaped flow guiding groove. A large amount of liquid CO₂ enters. The guide vane adjusts the angle to guide the liquid CO₂ to enter evenly and further increases the flow rate and pressure. Through the preliminary pressurization of the liquid CO₂ when it is input into the pump body by the pressurization mechanism, the inlet pressure is maintained above the saturated vapor pressure, preventing the liquid CO₂ from vaporizing to form bubbles, protecting the impeller from erosion, and extending the service life of the impeller.

[0022] By setting a fixed shaft, a connecting shaft, a torsion spring and a contact wheel, the guide vane can automatically adjust the matching angle with the arc-shaped guide groove as the arc-shaped baffle rotates. In the low-flow state, the guide vane is at a small guide angle, which can guide the liquid CO2 to enter the arc-shaped guide groove in a specific direction and angle, increasing the flow velocity and pressure of the liquid CO2 in the arc-shaped guide groove. In the high-flow state, the guide vane can automatically adjust to a large guide angle, adapt to the front edge of the arc-shaped guide groove, and guide a large amount of liquid CO2 to enter the arc-shaped guide groove evenly, further improving the pressurization effect. Description of the Drawings

[0023] Figure 1 Schematic three-dimensional structure diagram of the present invention;

[0024] Figure 2 Schematic cross-sectional three-dimensional structure diagram at the pump body of the present invention;

[0025] Figure 3 Schematic cross-sectional side view structure diagram of the pump body, input channel, output channel, main shaft, pressurization mechanism and guide mechanism of the present invention;

[0026] Figure 4 Schematic exploded three-dimensional structure diagram of the pump body, main shaft, impeller and pressurization mechanism of the present invention;

[0027] Figure 5 Schematic three-dimensional structure diagram of the pressurization mechanism of the present invention;

[0028] Figure 6 Schematic back view of the three-dimensional structure of the rotating disc of the present invention;

[0029] Figure 7 Schematic three-dimensional structure diagram of the arc-shaped baffle, rotating shaft and guide vane of the present invention;

[0030] Figure 8 Schematic exploded three-dimensional structure diagram of the arc-shaped baffle, limit strip, guide vane, fixed shaft, connecting shaft, torsion spring and convex rod of the present invention;

[0031] Figure 9 Schematic three-dimensional structure diagram of the convex rod, connecting arm, connecting frame and contact wheel of the present invention;

[0032] Figure 10 Schematic front view structure diagram of the rotating disc, arc-shaped guide groove and arc-shaped baffle of the present invention;

[0033] Figure 11 of the present invention Figure 10 Schematic enlarged structure diagram at position A;

[0034] Figure 12 Schematic diagram of the adjusted front view structure of the arc-shaped guide groove of the present invention;

[0035] Figure 13 Schematic three-dimensional structure diagram of the liquid inlet channel and the flow guiding mechanism of the present invention;

[0036] Figure 14 Schematic cross-sectional three-dimensional structure diagram of the liquid inlet channel and the flow guiding mechanism of the present invention.

[0037] In the figure:

[0038] 1. Pump body; 2. Input channel; 21. Liquid infusion channel; 22. Liquid inlet channel; 3. Output channel; 4. Main shaft; 5. Impeller; 6. Motor; 7. Boosting mechanism; 71. Rotating disk; 711. Driven shaft; 712. Track; 713. Connecting arm; 714. Connecting frame; 715. Contact wheel; 72. Arc-shaped flow guiding groove; 73. Arc-shaped baffle; 731. Slide column; 732. Connecting block; 733. Spring; 734. Positioning block; 735. Limit bar; 74. Rotating shaft; 75. Flow guiding vane; 751. Fitting groove; 752. Fixed shaft; 753. Connecting shaft; 754. Torsion spring; 755. Convex rod; 8. Flow guiding mechanism; 81. Directional catheter; 82. Liquid guiding groove. Specific embodiments

[0039] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0040] Referring to Figures 1-4 , a CO2 injection pump for petrochemical industry provided by the present invention includes a pump body 1, an input channel 2, an output channel 3, a main shaft 4, an impeller 5, and a motor 6. The input channel 2 includes a liquid infusion channel 21 and a liquid inlet channel 22 that is connected to the liquid infusion channel 21 in a through manner. The liquid infusion channel 21 is connected to the front end of the pump body 1 in a through manner. The inner diameter of the front end of the liquid inlet channel 22 is smaller than the inner diameter of the connection between the liquid inlet channel 22 and the liquid infusion channel 21. The inner diameter of the connection between the liquid inlet channel 22 and the liquid infusion channel 21 is smaller than the inner diameter of the liquid infusion channel 21. A boosting mechanism 7 is provided in the liquid infusion channel 21.

[0041] Specifically, referring to Figures 5-6The booster mechanism 7 includes a rotating disk 71, an arc-shaped guide groove 72, an arc-shaped baffle 73, a rotating shaft 74 and a guide blade 75. The rotating disk 71 is rotatably arranged in the infusion channel 21. The arc-shaped guide grooves 72 are arranged at equal intervals along the circumferential direction of the rotating disk 71. The shape and distribution of the arc-shaped guide grooves 72 can guide the liquid CO2 to flow along a specific path under the drive of the rotating disk 71. When the liquid CO2 enters the arc-shaped guide grooves 72, as the rotating disk 71 rotates, the liquid CO2 O2 is accelerated in the arc-shaped guide groove 72, and its kinetic energy is increased, thereby achieving preliminary pressurization. At the same time, the existence of the arc-shaped guide groove 72 allows the liquid CO2 to flow in an orderly manner, reducing turbulence and energy loss. The arc-shaped baffle 73 is movably arranged on the rotating disk 71, and can block or open the opening of the arc-shaped guide groove 72. One end of the arc-shaped baffle 73 close to the center of the rotating disk 71 is rotatably arranged on the rotating disk 71 through a rotating shaft 74. The rotating shaft 74 is used to connect the arc-shaped baffle 73 and the rotating disk 71. The rotating disk 71 enables the arc-shaped baffle plate 73 to rotate around the rotating shaft 74 to realize flexible control of the opening of the arc-shaped guide groove 72. A sliding column 731 is fixed on the arc-shaped baffle plate 73. The sliding column 731 is slidably arranged on the rotating disk 71. A connecting block 732 is fixed on one end of the sliding column 731 away from the arc-shaped baffle plate 73. A spring 733 is provided on the connecting block 732. A positioning block 734 is fixed on the other end of the spring 733. The positioning block 734 is fixed on the rotating disk 71. The plate 73 is slidably connected to the rotating disk 71 through the sliding column 731. Under the action of the spring 733, the position is automatically adjusted according to the change in the speed of the rotating disk 71. Under the high-flow working state, the speed of the rotating disk 71 is increased, the centrifugal force is increased, and the elastic force of the spring 733 is overcome. The arc baffle 73 opens, and the opening of the arc-shaped guide groove 72 is enlarged, allowing more liquid CO2 to enter to meet the demand for large flow, while also ensuring the normal flow and pressurization of the liquid CO2 in the arc-shaped guide groove 72.

[0042] Among them, refer to Figure 10 A track 712 cooperating with the slide post 731 is provided on the rotating disk 71. The slide post 731 slides in the track 712 to realize the movement of the arc baffle 73. The setting of the track 712 can limit the movement trajectory of the arc baffle 73 to prevent the arc baffle 73 from completely covering the arc guide groove 72.

[0043] The guide vane 75 is rotatably mounted on the front side of the arc baffle 73. Figures 7-11, an adapting groove 751 is provided at one end of the guide vane 75 close to the center of the rotating disk 71, a fixed shaft 752 is fixed in the adapting groove 751, a connecting shaft 753 is fixed on the fixed shaft 752, the connecting shaft 753 is rotatably connected to the arc baffle 73, a torsion spring 754 is provided on the connecting shaft 753, the two ends of the torsion spring 754 are respectively fixed to the fixed shaft 752 and the arc baffle 73, a convex rod 755 is also fixed on the fixed shaft 752, a connecting arm 713 is fixed on the rotating disk 71, and an end of the connecting arm 713 away from the rotating disk 71 is rotatably connected to an abutting wheel 715 through a connecting frame 714, and the abutting wheel 715 and the convex rod 755 cooperate with each other to change the angle of the guide vane 75, and the guide vane 7 5 is used to guide and pressurize the liquid CO2 entering the arc-shaped guide groove 72. Under different working conditions, the angle of the guide blade 75 is changed by the cooperation between the abutting wheel 715 and the protruding rod 755. Under low flow conditions, the guide blade 75 is at a smaller guide angle, guiding the liquid CO2 to enter the arc-shaped guide groove 72 in a specific direction and angle, increasing the flow speed and pressure of the liquid CO2 in the arc-shaped guide groove 72. Under high flow conditions, the guide blade 75 is adjusted to a larger guide angle to adapt to the front edge of the arc-shaped guide groove 72, guiding the liquid CO2 to enter the arc-shaped guide groove 72 evenly, and further increasing its flow speed and pressure, thereby enhancing the pressurization effect.

[0044] Among them, refer to Figures 7-8 A limit stop bar 735 is provided on the arc baffle 73. The limit stop bar 735 is used to limit the rotation angle range of the guide vane 75. Under low flow conditions, the guide vane 75 is at a smaller guide angle. The limit stop bar 735 plays an angle positioning role for the guide vane 75, while preventing the flow of liquid CO2 from exerting a large impact force on the guide vane 75, thereby preventing the guide vane 75 from shaking or angular displacement under the action of the impact force.

[0045] The guide vane 75 is narrow at the front end and wide at the rear end. The narrow portion at the front end of the guide vane 75 can maintain a low resistance in the high-speed flowing liquid CO2, ensuring that the liquid CO2 can quickly pass through the guide vane 75 and enter the arc-shaped guide groove 72.

[0046] Reference Figure 12 When in a low-flow working state, the arc-shaped baffle 73 blocks part of the opening of the arc-shaped guide groove 72 to limit the amount of liquid CO2 entering the arc-shaped guide groove 72, and the guide blade 75 performs preliminary diversion on the liquid CO2 entering the arc-shaped guide groove 72; when it is upgraded to a high-flow working state, the arc-shaped baffle 73 is opened, the opening of the arc-shaped guide groove 72 is enlarged, and a large amount of liquid CO2 enters the arc-shaped guide groove 72. At the same time, the diversion angle of the guide blade 75 is adjusted to pressurize the liquid CO2.

[0047] Among them, it should be noted that the output channel 3 is connected to the top of the pump body 1 for outputting the pressurized liquid CO2. The main shaft 4 passes through the pump body 1 and is rotatable. The impeller 5 is fixedly connected to the main shaft 4. The motor 6 is used to drive the rotation of the main shaft 4. The center of the rotating disk 71 is fixed with a driven shaft 711, and the driven shaft 711 is fixedly connected to the end of the main shaft 4 away from the motor 6. After the motor 6 is started, the rotation of the main shaft 4 drives the impeller 5 fixed on it to rotate together. At the same time, the rotation of the main shaft 4 is transmitted to the rotating disk 71 through the driven shaft 711, driving the rotating disk 71 to rotate in the liquid infusion channel 21, thereby driving the pressurizing mechanism 7 to work. The liquid CO2 enters the pump body 1 from the input channel 2. After passing through the flow regulation and preliminary pressurization of the pressurizing mechanism 7 and the further pressurization of the impeller 5, it is output from the output channel 3, completing the entire pressurized transportation process. The high-speed rotation of the motor 6 can control the sliding of the arc-shaped baffle 73, increasing the opening of the arc-shaped diversion groove 72. After a large amount of liquid CO2 enters through the increased opening of the arc-shaped diversion groove 72, it is more effectively pressurized under the action of the high-speed rotating rotating disk 71 and impeller 5.

[0048] Further, referring to Figures 13-14 , a diversion mechanism 8 is provided in the liquid inlet channel 22. The diversion mechanism 8 includes a directional conduit 81. The directional conduit 81 is arranged in the liquid inlet channel 22. A plurality of liquid guide grooves 82 are provided on the directional conduit 81. The plurality of liquid guide grooves 82 are equally spaced along the circumferential direction of the directional conduit 81. The plurality of liquid guide grooves 82 extend in a spiral form. The spiral liquid guide grooves 82 can guide the liquid CO2 to flow along a spiral path, improving the efficiency of the liquid CO2 entering the arc-shaped diversion groove 72. At the same time, when a large amount of liquid CO2 passes through the directional conduit 81, the plurality of spiral liquid guide grooves 82 can ensure that the liquid CO2 is evenly distributed into each arc-shaped diversion groove 72, avoiding the situation where the flow rate of some arc-shaped diversion grooves 72 is too large while that of some is too small, enabling the entire pressurizing mechanism 7 to work more efficiently. At the same time, the spiral design can also generate a certain centrifugal force during the flow of the liquid CO2, further increasing the pressure of the liquid CO2.

[0049] In a CO2 injection pump for petrochemical industry provided by the present invention, during use, the motor 6 serves as the power source of the entire pump and starts running after being powered on. The motor 6 drives the rotation of the main shaft 4. Since the impeller 5 is fixedly connected to the main shaft 4, the rotation of the main shaft 4 drives the impeller 5 to rotate at a high speed in the pump body 1. At the same time, the driven shaft 711 fixed at the center position of the rotating disk 71 is fixedly connected to the main shaft 4, and the rotation of the main shaft 4 is also transmitted to the rotating disk 71 through the driven shaft 711, causing the rotating disk 71 to rotate synchronously in the liquid infusion channel 21.

[0050] When the pump is in the low-flow working state, the motor 6 drives the main shaft 4 at a lower speed, thereby driving the impeller 5 and the rotating disk 71 to rotate at a low speed. At this time, the rotating disk 71 rotates at a low speed, and the centrifugal force acting on the arc-shaped baffle 73 is small. The spring 733 is in a compressed state. Due to its elastic force and the action of the track 712 and the sliding column 731, the arc-shaped baffle 73 is kept at a position blocking part of the opening of the arc-shaped diversion groove 72, thereby restricting the amount of liquid CO2 entering the arc-shaped diversion groove 72. The diversion blade 75 is at the inner edge of the arc-shaped baffle 73 in the low-flow state. At this time, the diversion blade 75 preliminarily diverts the small amount of liquid CO2 entering the arc-shaped diversion groove 72, enabling the liquid CO2 to accelerate and flow in a smaller space, increasing the pressure. The liquid CO2 uniformly flows in from the directional conduit 81 and the multiple groups of liquid guide grooves 82 in the liquid inlet channel 22, enters the pump body 1 after being preliminarily pressurized by the arc-shaped diversion groove 72 in the liquid delivery channel 21, is further pressurized by the impeller 5 rotating at a low speed, and finally is output from the output channel 3 to meet the production requirements in the low-flow working state. When it is necessary to increase the delivery flow rate of the liquid CO2 from low flow to high flow, the speed of the motor 6 is increased. After the speed of the motor 6 is increased, the speeds of the main shaft 4, the impeller 5, and the rotating disk 71 increase accordingly. The speed of the rotating disk 71 increases, and the centrifugal force acting on the arc-shaped baffle 73 increases. When the centrifugal force is greater than the elastic force of the spring 733, the arc-shaped baffle 73 slides on the rotating disk 71 through the sliding column 731 and gradually moves away from the arc-shaped diversion groove 72. The opening of the arc-shaped diversion groove 72 increases, and a large amount of liquid CO2 enters the arc-shaped diversion groove 72. At the same time, the diversion blade 75 rotates with the rotation of the arc-shaped baffle 73 and gradually moves away from the arc-shaped diversion groove 72 until the convex rod 755 contacts the abutting wheel 715. The abutting wheel 715 squeezes the convex rod 755, causing the fixed shaft 752 and the connecting shaft 753 to rotate, and then driving the diversion blade 75 to rotate again towards the direction of the arc-shaped diversion groove 72, so that the diversion blade 75 rotates to the front edge of the arc-shaped diversion groove 72, thereby adapting to the shape of the front edge of the arc-shaped diversion groove 72, guiding the liquid CO2 to uniformly enter the arc-shaped diversion groove 72, and further increasing its flow rate and pressure;

[0051] A large amount of liquid CO2 preliminarily pressurized by the arc-shaped diversion groove 72 enters the pump body 1. At this time, the impeller 5 rotating at a high speed further pressurizes the liquid CO2, so that its pressure and flow rate meet the requirements of the high-flow working state, and finally it is output from the output channel 3 and injected into the petrochemical production process.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A CO2 injection pump for petrochemical industry, comprising a pump body, an input channel, an output channel, a main shaft, an impeller and a motor, characterized in that: The input channel includes an infusion channel and a liquid inlet channel connected to the infusion channel, the infusion channel is connected to the front end of the pump body, a booster mechanism is provided in the infusion channel, the booster mechanism includes a rotating disk, an arc-shaped guide groove, an arc-shaped baffle, a rotating shaft and a guide vane, the rotating disk is rotatably arranged in the infusion channel, the arc-shaped guide groove is opened at equal intervals along the circumferential direction of the rotating disk, the arc-shaped baffle is movably arranged on the rotating disk and can cover or open the opening of the arc-shaped guide groove, and the guide vane is rotatably installed on the front side of the arc-shaped baffle; When in a low flow working state, the arc-shaped baffle blocks part of the opening of the arc-shaped guide groove, limiting the amount of liquid CO2 entering the arc-shaped guide groove, and the guide vane performs preliminary diversion of the liquid CO2 entering the arc-shaped guide groove; When it is raised to a high flow working state, the arc-shaped baffle opens, the opening of the arc-shaped guide groove increases, a large amount of liquid CO2 enters the arc-shaped guide groove, and at the same time, the guide angle of the guide blade is adjusted to pressurize the liquid CO2.

2. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: One end of the arc-shaped baffle plate close to the center of the rotating disk is rotatably arranged on the rotating disk through a rotating shaft, a sliding column is fixedly arranged on the arc-shaped baffle plate, and the sliding column is slidably arranged on the rotating disk, and a connecting block is fixedly arranged on the end of the sliding column away from the arc-shaped baffle plate, and a spring is arranged on the connecting block, and a positioning block is fixedly arranged on the other end of the spring, and the positioning block is fixed on the rotating disk.

3. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: An adapting groove is formed at one end of the guide vane close to the center of the rotating disk, a fixed shaft is fixed in the adapting groove, a connecting shaft is fixed on the fixed shaft, the connecting shaft is rotatably connected to the arc baffle, a torsion spring is provided on the connecting shaft, and a convex rod is also fixed on the fixed shaft; A connecting arm is fixed on the rotating disk, and one end of the connecting arm away from the rotating disk is rotatably connected to an abutment wheel through a connecting frame, and the abutment wheel cooperates with the convex rod to change the angle of the guide vane.

4. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: The output channel is connected to the top of the pump body for outputting pressurized liquid CO2, the main shaft passes through the pump body and is rotatable, the impeller is fixedly connected to the main shaft, the motor is used to drive the main shaft to rotate, and a driven shaft is fixed to the center of the rotating disk, and the driven shaft is fixedly connected to the main shaft.

5. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: The rotating disk is provided with a track matched with a slide post, and the slide post slides in the track to realize the movement of the arc-shaped baffle.

6. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: The arc-shaped baffle is provided with a limit stop bar, which is used to limit the rotation angle range of the guide vane.

7. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: The guide vane is in a shape of being narrow at the front end and wide at the rear end.

8. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: A flow guiding mechanism is arranged in the liquid inlet channel, and the flow guiding mechanism comprises a directional catheter, the directional catheter is arranged in the liquid inlet channel, and a plurality of groups of liquid guiding grooves are arranged on the directional catheter.

9. The CO2 injection pump for petrochemical industry according to claim 8, characterized in that: A plurality of groups of liquid-conducting grooves are arranged at equal intervals along the circumferential direction of the directional catheter, and the plurality of groups of liquid-conducting grooves extend in a spiral line form.

10. The CO2 injection pump for petrochemical industry according to claim 1, characterized in that: The inner diameter of the front end of the liquid inlet channel is smaller than the inner diameter of the connection between the liquid inlet channel and the infusion channel, and the inner diameter of the connection between the liquid inlet channel and the infusion channel is smaller than the inner diameter of the infusion channel.

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