Gas-liquid mixed transportation pump and gas-liquid mixed transportation method

Abstract

The invention discloses a gas-liquid mixed transportation pump and a gas-liquid mixed transportation method, and relates to the technical field of pumps. The pump body is detachably connected to the bearing box; the bubble dispersing plate is arranged in the suction chamber; the rotating shaft penetrates through the bearing box and extends into the pump body, and the mechanical sealing assembly is arranged on the rotating shaft in a sleeving mode and located in the bearing box. The premixing impeller and the centrifugal impeller are arranged at intervals along the rotating shaft and located in the pump body, and an outlet of the premixing impeller is in fluid communication with an inlet of the centrifugal impeller; a jet device is arranged on the side wall of the suction chamber; the diffuser is arranged between the outlet of the centrifugal impeller and the inlet of the delivery chamber; an outlet of the delivery chamber is connected to an outlet pipeline. Through a two-stage crushing structure of the bubble dispersion plate and the jet device, the gas phase agglomeration phenomenon is reduced, the gas-liquid mixing uniformity is improved, and the efficiency reduction of the centrifugal impeller caused by gas phase agglomeration is avoided; the diffuser can restrain gas-liquid separation in a targeted mode and is matched with the front mixing effect of the premixing impeller, and the application range of the pump body to different gas containing rate working conditions is widened.

Description

Technical Field

[0001] The present application relates to the field of pump technology, and in particular to a gas-liquid mixed transmission pump and a gas-liquid mixed transmission method. Background Art

[0002] In industrial fields such as oil and natural gas extraction, chemical industry, and new energy, the efficient and stable transportation of gas-liquid two-phase media is the core link to achieve full-process safety optimization and efficient resource utilization.

[0003] Traditional centrifugal gas-liquid mixed-transfer pumps, the mainstream equipment in this field, are designed based on the dynamics of single-phase fluids, using the centrifugal force generated by the rotating impeller to generate work on the medium. However, under conditions of low inlet pressure and high gas content, the gas-liquid two-phase medium undergoes non-uniform phase evolution within the impeller flow path, and the gas phase tends to coalesce to form large, discrete gas masses. These gas masses block the continuous flow path of the liquid phase, weakening the kinetic energy transfer between the impeller and the liquid phase, resulting in a sharp drop in the mixed-transfer pump's delivery efficiency or even a complete loss of work performance. This severely limits its reliability and engineering application scope in complex gas-liquid medium transportation scenarios. Summary of the Invention

[0004] The embodiments of the present application solve the problems raised in the background art by providing a gas-liquid mixed transmission pump and a gas-liquid mixed transmission method.

[0005] In the first aspect, the embodiment of the present application provides a gas-liquid mixed transfer pump, including a pump body, a bearing box, a premixing impeller, a centrifugal impeller, a rotating shaft, a mechanical seal assembly, a diffuser and a bubble dispersion plate; the front end of the pump body is provided with a suction chamber, and the top is provided with an extrusion chamber, the pump body is detachably connected to the bearing box, and the suction chamber is connected to the inlet pipeline; the bubble dispersion plate is arranged in the suction chamber; the rotating shaft passes through the bearing box and extends into the pump body, the mechanical seal assembly is sleeved on the rotating shaft and is located in the bearing box; the premixing impeller and the centrifugal impeller The premixing impeller is arranged at intervals along the rotating axis and is located in the pump body, and the outlet of the premixing impeller is connected to the inlet fluid of the centrifugal impeller; the side wall of the suction chamber is provided with a jet device, and the jet device is connected to the inlet pipeline, which is used to accelerate part of the gas-liquid mixed medium in the inlet pipeline into a high-speed jet, and directly spray it to the inlet area of ​​the premixing impeller to break up the gas phase agglomeration; the diffuser is arranged between the outlet of the centrifugal impeller and the inlet of the extrusion chamber, and is used to reduce the flow rate of the gas-liquid mixed medium to inhibit the gas phase from separating from the liquid phase; the outlet of the extrusion chamber is connected to the outlet pipeline.

[0006] In combination with the first aspect, in a possible implementation, the diffuser includes an outer shell, an inner cone, a middle cone, an outer cone, a first limiting ring, a second limiting ring, a first elastic sealing ring, a second elastic sealing ring, a plurality of first elastic members, a plurality of second elastic members and a plurality of connecting rods; the two ends of the outer shell are respectively fixedly connected to the outlet of the centrifugal impeller and the inlet of the extrusion chamber, a plurality of slide rails are arranged at circumferential intervals on the inner wall of the outer shell, and each of the slide rails extends along the axial direction of the outer shell; the inner cone, the middle cone and the outer cone are all coaxially arranged in the outer shell, the inner cone is fixedly connected to the outlet of the centrifugal impeller, the middle cone is coaxially sleeved on the outer side of the inner cone and slidably connected to the slide rail of the outer shell, the outer cone is coaxially sleeved on the outer side of the middle cone and slidably connected to the slide rail of the outer shell, the tapers of the inner cone, the middle cone and the outer cone increase in sequence, and their large ends are all facing the inlet of the extrusion chamber; the outer wall of the top of the inner cone and the outer wall of the top of the middle cone A first limiting ring and a second limiting ring are respectively provided, the first limiting ring being used to limit the maximum movement stroke of the middle cone toward the inlet direction of the extrusion chamber, and the second limiting ring being used to limit the maximum movement stroke of the outer cone toward the inlet direction of the extrusion chamber; the inner wall of the bottom of the middle cone and the inner wall of the bottom of the outer cone are respectively provided with a first elastic sealing ring and a second elastic sealing ring, and in the process of the middle cone and the outer cone moving along the slide rail, the first elastic sealing ring and the second elastic sealing ring always elastically abut the outer wall of the inner cone and the outer wall of the middle cone; a plurality of connecting rods are fixedly connected to the inner wall of the outer shell near the outlet of the centrifugal impeller at intervals along the circumference; the two ends of a plurality of first elastic members are respectively connected to the circumference of the bottom of the middle cone and the corresponding connecting rods; the two ends of a plurality of second elastic members are respectively connected to the circumference of the bottom of the outer cone and the corresponding connecting rods; the elastic coefficient of the second elastic member is smaller than the elastic coefficient of the first elastic member; When the air content is ≤10%, the inner cone, the middle cone, and the outer cone are flush with each other at one end close to the inlet of the extrusion chamber, and the inner cone forms a first-stage pressure diffusion channel. At this time, the first elastic member and the second elastic member are both in a pre-tightened state, and the middle cone and the outer cone remain stationary under the action of the pre-tightening force. When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member and stretches the second elastic member, causing the outer cone to move along the slide rail toward the inlet of the extrusion chamber. At this time, the middle cone remains stationary, and two-stage diffusion channels are formed between the inner cone and the outer cone. When the gas content is greater than 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member and the preload of the first elastic member, and stretches the second elastic member and the first elastic member, so that the middle cone and the outer cone move along the slide rail toward the inlet of the extrusion chamber, and the inner cone, the middle cone, and the outer cone form a three-stage pressure diffusion channel.

[0007] In combination with the first aspect, in a possible implementation, when the gas content is ≤10%, the inner cone, the middle cone and the outer cone are flush with each other near the end of the extrusion chamber inlet, and the position of the middle cone near the end of the centrifugal impeller outlet is lower than the position of the outer cone near the end of the centrifugal impeller outlet; a plurality of first limit blocks are provided at circumferential intervals on the outer wall of the middle cone, and the first limit blocks are located below the outer cone; a plurality of second limit blocks corresponding to the first limit blocks are provided at circumferential intervals on the outer wall of the outer cone; each first limit block and the corresponding second limit block are respectively slidably provided in the same slide rail.

[0008] In combination with the first aspect, in a possible implementation, the end face of the first limiting ring facing the first elastic sealing ring and the end face of the second limiting ring facing the second elastic sealing ring are both provided with a first tooth profile; the first elastic sealing ring and the second elastic sealing ring are both provided with a second tooth profile corresponding to the first tooth profile on the side facing the first limiting ring and the second limiting ring, so that when the middle cone or the outer cone moves to the limiting position, a seal is formed by the engagement of the first tooth profile and the second tooth profile.

[0009] In combination with the first aspect, in a possible implementation, the suction chamber is an axially tapered conical structure, and a large end thereof is connected to the inlet pipe.

[0010] In combination with the first aspect, in a possible implementation, the jet device includes an inner cylinder, an outer cylinder, a driving member and an air content sensor; the outer cylinder is fixed to the pump body, and the inner cylinder is rotatably mounted in the outer cylinder; a plurality of first spray holes are provided on the bottom end surface of the inner cylinder at circumferential intervals, and a plurality of second spray holes are provided on the bottom end surface of the outer cylinder at positions corresponding to the first spray holes; the outer cylinder is connected to the inlet pipeline; the air content sensor is installed in the flow channel of the pump body for real-time detection of the air content of the gas-liquid mixed medium; the driving member is fixed to the pump body, and its output end is connected to the inner cylinder; the air content sensor is signal-connected to the driving member; when a change in the air content is detected, the driving member drives the inner cylinder to rotate, and adjusts the jet flow rate of the jet device by changing the overlap between the first spray hole and the second spray hole.

[0011] In combination with the first aspect, in a possible implementation, the jet device includes an inner cylinder, an outer cylinder, a screw rod, a slider and a pressure difference drive assembly; the outer cylinder is fixed to the pump body, and the inner cylinder is rotatably sleeved in the outer cylinder; the bottom end surface of the inner cylinder is provided with a plurality of first spray holes at circumferential intervals, and the bottom end surface of the outer cylinder is provided with a plurality of second spray holes at positions corresponding to the first spray holes; the outer cylinder is connected to the inlet pipe; the screw rod is located in the outer cylinder, and one end of the screw rod extends into the inner cylinder; the slider is sleeved on the screw rod through its internal thread and engages with the external thread of the screw rod; the pressure difference drive assembly includes: a plurality of first connecting rods, which are arranged at intervals along the circumference, one end of which is fixedly connected to the inner wall of the outer cylinder, and the other end is a free end, and is located above the inner cylinder; a plurality of second connecting rods, which are arranged at intervals along the circumference, one end of which is fixedly connected to the inner wall of the inner cylinder, and the other end is fixedly connected to the slider; a plurality of third elastic members, whose two ends are respectively connected to the top of the screw rod and the free end of the first connecting rod; When the gas content of the inlet pipeline increases, the thrust generated by the gas-liquid mixed medium pushes the screw rod to move axially downward to compress the third elastic member; at the same time, the slider rotates circumferentially due to the threaded fit with the screw rod, and drives the inner cylinder to rotate synchronously through the second connecting rod to change the overlap between the first nozzle and the second nozzle.

[0012] In a second aspect, an embodiment of the present application provides a gas-liquid mixed transport method, comprising the gas-liquid mixed transport pump described in the first aspect or any possible implementation of the first aspect, further comprising: S1: The gas-liquid mixed medium enters the suction chamber through the inlet pipe, and the gas phase agglomerates are initially broken by the bubble dispersion plate in the suction chamber; S2: The jet device extracts part of the gas-liquid mixed medium from the gas-liquid mixed medium, accelerates it into a high-speed jet, and then directly injects it into the inlet area of ​​the premixing impeller, using the jet impact force to perform secondary crushing on the gas phase; S3: The gas-liquid mixed medium after secondary crushing enters the pre-mixing impeller, where the gas-liquid mixed medium is initially mixed through the rotation and stirring of the pre-mixing impeller, and then is transported to the centrifugal impeller for pressurization; S4: The high-speed gas-liquid mixed medium pressurized by the centrifugal impeller (3) enters the diffuser, and the flow velocity of the gas-liquid mixed medium is reduced by the flow channel structure of the diffuser (6), thereby converting kinetic energy into pressure energy and suppressing the separation of the gas phase from the liquid phase; S5: The gas-liquid mixed medium that has completed pressure expansion is collected in the extrusion chamber and transported to the outlet pipeline.

[0013] In conjunction with the second aspect, in one possible implementation, in step S4, the diffuser automatically switches the number of diffusion stages according to the real-time gas content of the gas-liquid mixed medium, including: When the air holdup is ≤10%, the inner, middle, and outer cones of the diffuser are flush with each other near the extrusion chamber inlet, forming a primary diffusion channel with the inner cone. At this point, both the first and second elastic members are in a preloaded state, and the middle and outer cones remain stationary under the action of the preload force. When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixture overcomes the preload of the second elastic member and stretches the second elastic member. Since the elastic coefficient of the second elastic member is smaller than that of the first elastic member, the outer cone moves along the slide rail of the outer shell toward the inlet of the extrusion chamber. At this time, the middle cone remains stationary, forming a two-stage pressure diffusion channel consisting of the inner cone and the outer cone. When the gas content is greater than 20%, the aerodynamic thrust of the gas-liquid mixed medium simultaneously overcomes the preload of the second elastic member and the first elastic member and stretches both, causing the middle cone and the outer cone to move along the slide rail of the outer shell toward the inlet of the extrusion chamber, forming a three-stage expansion channel consisting of the inner cone, the middle cone and the outer cone.

[0014] In conjunction with the second aspect, in one possible implementation, in step S2, the flow rate of the high-speed jet is dynamically controlled by rotating the inner cylinder of the jet device to change the overlap between the first nozzle hole and the second nozzle hole of the outer cylinder, including: The gas content of the gas-liquid mixed medium is detected in real time. When the gas content increases, the driving member drives the inner cylinder to rotate relative to the outer cylinder, increasing the overlap between the first and second nozzle holes, increasing the flow rate of the high-speed jet, and enhancing the secondary crushing effect of the gas phase to avoid gas phase agglomeration; When the gas content decreases, the driving member drives the inner cylinder to rotate in the opposite direction, reducing the overlap between the first and second nozzle holes, reducing the flow rate of the high-speed jet, and reducing energy loss while ensuring the crushing effect.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or: The gas-liquid mixed transfer pump provided in the embodiments of the present application includes a pump body, a bearing housing, a premixing impeller, a centrifugal impeller, a rotating shaft, a mechanical seal assembly, a diffuser, and a bubble dispersion plate. The gas-liquid mixed medium first enters the suction chamber at the front end of the pump body, where it is initially broken down by the bubble dispersion plate within the suction chamber. Simultaneously, a jet device on the sidewall of the suction chamber accelerates a portion of the gas-liquid mixed medium from the inlet pipe into a high-speed jet, which is then directly injected into the inlet area of ​​the premixing impeller, performing a secondary breakup of the gas phase to further refine the bubbles. The broken gas-liquid mixed medium then enters the premixing impeller, where it undergoes initial mixing under its rotating stirring action. The premixing impeller outlet is then transported to the inlet of the centrifugal impeller, where it is pressurized by the centrifugal impeller's rotation to obtain sufficient kinetic energy. The pressurized, high-speed gas-liquid mixed medium enters the diffuser, located between the centrifugal impeller outlet and the inlet of the extrusion chamber. Within the diffuser, the flow velocity is reduced, and kinetic energy is converted into pressure energy, effectively suppressing the separation of the gas phase from the liquid phase. Finally, the gas-liquid mixed medium is collected in the extrusion chamber and discharged through the outlet pipe. On the one hand, the present application uses a two-stage crushing structure of a bubble dispersion plate and a jet device to greatly reduce the gas phase agglomeration phenomenon, improve the uniformity of gas-liquid mixing, and avoid the efficiency drop of the centrifugal impeller due to gas phase aggregation; on the other hand, the diffuser can specifically inhibit gas-liquid separation, and cooperate with the pre-mixing effect of the premixing impeller to significantly broaden the adaptability of the pump body to working conditions with different gas content rates, especially in high gas content scenarios. It can still maintain stable pressurization and delivery capacity, reduce the risk of vibration, noise and component wear caused by gas-liquid separation, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of the structure of a gas-liquid mixed transmission pump provided in an embodiment of the present application; Figure 2 A schematic structural diagram of a first-stage pressure diffusion channel provided in an embodiment of the present application; Figure 3 for Figure 2 sectional view of Figure 4 A schematic structural diagram of a secondary pressure diffusion channel provided in an embodiment of the present application; Figure 5 for Figure 4 sectional view of Figure 6 A schematic structural diagram of a three-stage pressure diffusion channel provided in an embodiment of the present application; Figure 7A schematic structural diagram of a connecting rod provided in an embodiment of the present application; Figure 8 A schematic structural diagram of a first limiting block provided in an embodiment of the present application; Figure 9 A schematic structural diagram of the first limit block and the second limit block provided in an embodiment of the present application; Figure 10 A schematic diagram of the structure of the outer cone provided in an embodiment of the present application; Figure 11 A flow diagram of a diffuser provided in an embodiment of the present application; Figure 12 A schematic diagram of the structure of the inner cylinder and outer cylinder provided in an embodiment of the present application; Figure 13 A schematic diagram of the structure of the first nozzle and the second nozzle provided in an embodiment of the present application; Figure 14 A schematic structural diagram of a pressure difference drive assembly provided in an embodiment of the present application; Figure 15 This is a schematic structural diagram of the second connecting rod provided in an embodiment of the present application.

[0018] Icons: 1- pump body; 11- suction chamber; 12- discharge chamber; 2- bearing box; 3- centrifugal impeller; 4- rotating shaft; 5- mechanical seal assembly; 6- diffuser; 61- outer casing; 611- slide rail; 62- inner cone; 63- middle cone; 631- first limit block; 64- outer cone; 641- second limit block; 65- first limit ring; 66- second limit ring; 67- first elastic sealing ring; 68- second elastic sealing ring; 69- first elastic member; 691- second elastic member; 692- connecting rod; 7- bubble dispersion plate; 8- premixing impeller; 9- jet device; 91- inner cylinder; 92- outer cylinder; 93- screw rod; 94- slider; 95- pressure difference drive assembly; 951- first connecting rod; 952- second connecting rod; 953- third elastic member. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0020] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0021] The embodiment of the present application provides a gas-liquid mixed transmission pump, such as Figures 1 to 15 As shown, the gas-liquid mixed transfer pump includes a pump body 1, a bearing box 2, a premixing impeller 8, a centrifugal impeller 3, a rotating shaft 4, a mechanical seal assembly 5, a diffuser 6 and a bubble dispersion plate 7. A suction chamber 11 is provided at the front end of the pump body 1, and an extrusion chamber 12 is provided at the top. The pump body 1 is detachably connected to the bearing box 2. The suction chamber 11 is connected to the inlet pipeline. The bubble dispersion plate 7 is arranged in the suction chamber 11. The rotating shaft 4 passes through the bearing box 2 and extends into the pump body 1. The mechanical seal assembly 5 is sleeved on the rotating shaft 4 and is located in the bearing box 2. The premixing impeller 8 and the centrifugal impeller 3 are spaced apart along the rotating shaft 4 and are located in the pump body 1. The outlet of the premixing impeller 8 is fluidically connected to the inlet of the centrifugal impeller 3. A jet device 9 is provided on the side wall of the suction chamber 11. The jet device 9 is connected to the inlet pipeline and is used to accelerate part of the gas-liquid mixed medium in the inlet pipeline into a high-speed jet, which is directly sprayed into the inlet area of ​​the premixing impeller 8 to break up gas phase agglomeration. The diffuser 6 is disposed between the outlet of the centrifugal impeller 3 and the inlet of the extrusion chamber 12 to reduce the flow rate of the gas-liquid mixed medium to inhibit the gas phase from separating from the liquid phase. The outlet of the extrusion chamber 12 is connected to an outlet pipeline.

[0022] In the embodiment of the present application, the suction chamber 11 is an axially tapered structure, and its large end is connected to the inlet pipe.

[0023] Specifically, the cone angle of the axially tapered conical structure is 8-15°, which is used to increase the flow velocity of the liquid medium and enhance the inlet turbulence effect of the premixing impeller 8 .

[0024] In the embodiment of the present application, the premixing impeller 8 is a fully open swirl impeller or a spiral impeller.

[0025] It should be noted that the fully open swirl impeller uses the high shear stress generated by the strong swirl field or the spiral impeller uses the continuous torsional shear caused by the spiral flow channel to deeply refine the gas-liquid mixed medium, so that the gas phase is fully dispersed into micron-sized bubbles and evenly embedded in the liquid phase continuum before entering the centrifugal impeller 3, thereby reducing the phenomenon of gas agglomeration in the flow channel of the centrifugal impeller 3.

[0026] It should be noted that the gas-liquid mixture first enters the suction chamber 11 at the front end of the pump body 1. Bubble dispersion plates 7 within the suction chamber 11 initially break up gas phase agglomerates. Simultaneously, the jet device 9 on the sidewall of the suction chamber 11 accelerates a portion of the gas-liquid mixture from the inlet pipeline into a high-speed jet, which is then sprayed directly onto the inlet of the premixing impeller 8, where it undergoes a secondary breakup of the gas phase to further refine the bubbles. The broken gas-liquid mixture then enters the premixing impeller 8, where its rotation and stirring action achieve initial mixing. It is then transported from the outlet of the premixing impeller 8 to the inlet of the centrifugal impeller 3, where it receives sufficient kinetic energy through the rotational supercharging of the centrifugal impeller 3. The supercharged, high-speed gas-liquid mixture then enters the diffuser 6, located between the outlet of the centrifugal impeller 3 and the inlet of the extrusion chamber 12. Within the diffuser 6, the flow velocity is reduced, and kinetic energy is converted into pressure energy, effectively suppressing the separation of the gas phase from the liquid phase. Finally, the gas-liquid mixture is collected in the extrusion chamber 12 and discharged through the outlet pipeline. On the one hand, the present application uses a two-stage crushing structure of the bubble dispersion plate 7 and the jet device 9 to greatly reduce the gas phase agglomeration phenomenon, improve the uniformity of gas-liquid mixing, and avoid the efficiency drop of the centrifugal impeller 3 due to gas phase aggregation; on the other hand, the diffuser 6 can specifically suppress gas-liquid separation, and cooperate with the pre-mixing effect of the premixing impeller 8 to significantly broaden the adaptability of the pump body 1 to different gas content conditions, especially in high gas content scenarios. It can still maintain stable boosting and conveying capacity, reduce the risk of vibration, noise and component wear caused by gas-liquid separation, and extend the service life of the equipment.

[0027] In the embodiment of the present application, the diffuser 6 includes an outer shell 61, an inner cone 62, a middle cone 63, an outer cone 64, a first limiting ring 65, a second limiting ring 66, a first elastic sealing ring 67, a second elastic sealing ring 68, a plurality of first elastic members 69, a plurality of second elastic members 691 and a plurality of connecting rods 692.

[0028] The ends of the outer shell 61 are fixedly connected to the outlet of the centrifugal impeller 3 and the inlet of the extrusion chamber 12, respectively. A plurality of slide rails 611 are circumferentially spaced apart on the inner wall of the outer shell 61, each of which extends axially along the outer shell 61. The inner cone 62, the middle cone 63, and the outer cone 64 are all coaxially disposed within the outer shell 61. The inner cone 62 is fixedly connected to the outlet of the centrifugal impeller 3. The middle cone 63 is coaxially sleeved on the outside of the inner cone 62 and slidably connected to the slide rails 611 of the outer shell 61. The outer cone 64 is coaxially sleeved on the outside of the middle cone 63 and slidably connected to the slide rails 611 of the outer shell 61. The tapers of the inner cone 62, middle cone 63, and outer cone 64 increase in sequence, and their larger ends all face the inlet of the extrusion chamber 12. The outer walls of the top of the inner cone 62 and the outer walls of the top of the middle cone 63 are respectively provided with a first limiting ring 65 and a second limiting ring 66. The first limiting ring 65 is used to limit the maximum travel of the middle cone 63 toward the inlet of the extrusion chamber 12, while the second limiting ring 66 is used to limit the maximum travel of the outer cone 64 toward the inlet of the extrusion chamber 12. The inner walls of the bottom of the middle cone 63 and the inner walls of the bottom of the outer cone 64 are respectively provided with a first elastic sealing ring 67 and a second elastic sealing ring 68. During the movement of the middle cone 63 and the outer cone 64 along the slide rail 611, the first elastic sealing ring 67 and the second elastic sealing ring 68 always elastically abut the outer walls of the inner cone 62 and the outer walls of the middle cone 63. Specifically, as the outer cone 64 and the middle cone 63 move, the gas-liquid mixture entering the first elastic sealing ring 67 and the second elastic sealing ring 68 from above is pushed into the tops of the outer cone 64 and the middle cone 63. A plurality of connecting rods 692 are fixedly connected to the inner wall of the housing 61 at intervals along the circumference, near the outlet end of the centrifugal impeller 3. The ends of the plurality of first elastic members 69 are connected to the circumference of the bottom of the middle cone 63 and to the corresponding connecting rods 692. The ends of the plurality of second elastic members 691 are connected to the circumference of the bottom of the outer cone 64 and to the corresponding connecting rods 692. The elastic coefficient of the second elastic member 691 is smaller than the elastic coefficient of the first elastic member 69.

[0029] When the air void fraction is ≤10%, the inner cone 62, middle cone 63, and outer cone 64 are flush at the end closest to the inlet of the extrusion chamber 12, and the inner cone 62 forms a primary pressure diffusion channel. At this point, the first elastic member 69 and the second elastic member 691 are both preloaded, and the middle cone 63 and outer cone 64 remain stationary under the action of the preload force.

[0030] When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member 691 and stretches the second elastic member 691, causing the outer cone 64 to move along the slide rail 611 toward the inlet of the extrusion chamber 12. At this time, the middle cone 63 remains stationary, and two-stage diffusion channels are formed between the inner cone 62 and the outer cone 64.

[0031] When the gas content is greater than 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member 691 and the preload of the first elastic member 69, and stretches the second elastic member 691 and the first elastic member 69, so that the middle cone 63 and the outer cone 64 move along the slide rail 611 toward the inlet of the extrusion chamber 12, and the inner cone 62, the middle cone 63 and the outer cone 64 form a three-stage diffusion channel.

[0032] It should be noted that the present application realizes adaptive switching of the number of diffusion stages according to the gas content through the first elastic member 69 and the second elastic member 691. When the gas content is low, the first-stage diffusion ensures efficiency. When the gas content is medium and high, the multi-stage incremental taper can slow down and avoid the flow separation of the gas-liquid two-phase medium. When the gas content is large, the gas phase tends to accumulate on the surface of the diffuser 6. The multi-stage incremental taper forms surface vortices through angle mutations, which enhances the gas-liquid mixing. The vortex is used to impact the gas phase adsorbed and accumulated on the surface and then re-entrain the liquid phase and be taken away. The first elastic sealing ring 67 and the second elastic sealing ring 68 maintain a seal during dynamic adjustment to prevent medium leakage; the overall structure can match different working conditions without external control, significantly improving the adaptability of the pump body 1 to gas-liquid mixed media, especially in high gas content scenarios, it can reduce flow losses and vibration noise, and extend the operating life of the equipment.

[0033] In the embodiment of the present application, when the air void fraction is ≤10%, the inner cone 62, the middle cone 63, and the outer cone 64 are flush at their ends near the inlet of the extrusion chamber 12, and the position of the middle cone 63 near the outlet of the centrifugal impeller 3 is lower than the position of the outer cone 64 near the outlet of the centrifugal impeller 3. A plurality of first stoppers 631 are circumferentially spaced apart on the outer wall of the middle cone 63, and the first stoppers 631 are located below the outer cone 64. A plurality of second stoppers 641 corresponding to the first stoppers 631 are circumferentially spaced apart on the outer wall of the outer cone 64. Each first stopper 631 and the corresponding second stopper 641 are slidably disposed within the same slide rail 611.

[0034] It should be noted that when the gas content increases, the first limit block 631 and the second limit block 641 move independently in layers within the same slide rail 611. This design is extremely ingenious. The same slide rail 611 provides a predetermined movement path for the two, ensuring that they move precisely according to their own rules, effectively avoiding motion interference, and at the same time accurately controlling the axial displacement difference between the middle cone 63 and the outer cone 64 to ensure stable operation of the equipment. Specifically, on this basis, a sealing layer is added between the inner wall of the outer shell 61 and the outer wall of the outer cone 64 without affecting the movement of the outer cone 64.

[0035] In the embodiment of the present application, a first tooth profile is provided on the end surface of the first limiting ring 65 facing the first elastic sealing ring 67, and a first tooth profile is provided on the end surface of the second limiting ring 66 facing the second elastic sealing ring 68. A second tooth profile corresponding to the first tooth profile is provided on the side of the first elastic sealing ring 67 and the second elastic sealing ring 68 facing the first limiting ring 65 and the second limiting ring 66, so that when the middle cone 63 or the outer cone 64 moves to the limiting position, the first tooth profile and the second tooth profile engage to form a seal.

[0036] In the embodiment of the present application, the jet device 9 includes an inner cylinder 91, an outer cylinder 92, a driving member and an air content sensor. The outer cylinder 92 is fixed to the pump body 1, and the inner cylinder 91 is rotatably mounted inside the outer cylinder 92. The bottom end surface of the inner cylinder 91 is provided with a plurality of first spray holes spaced circumferentially, and the bottom end surface of the outer cylinder 92 is provided with a plurality of second spray holes at positions corresponding to the first spray holes. The outer cylinder 92 is connected to the inlet pipeline. The air content sensor is installed in the flow channel of the pump body 1 and is used to detect the air content of the gas-liquid mixed medium in real time. The driving member is fixed to the pump body 1, and its output end is connected to the inner cylinder 91. The air content sensor is signal-connected to the driving member. When a change in the air content is detected, the driving member drives the inner cylinder 91 to rotate, and adjusts the jet flow of the jet device 9 by changing the overlap between the first spray hole and the second spray hole.

[0037] It should be noted that the jet device 9 can accurately capture the dynamic changes of the gas content of the gas-liquid mixed medium in real time by arranging the gas content sensor in the flow channel of the pump body 1, and quickly transmit the signal to the driving part connected to the inner cylinder 91. The driving part then drives the inner cylinder 91 to rotate, and cleverly utilizes the change in the overlap between the first nozzle of the inner cylinder 91 and the second nozzle at the corresponding position of the outer cylinder 92 to flexibly and accurately adjust the jet flow rate, effectively improving the adaptability and adjustment ability of the jet device 9 to different gas content working conditions, and ensuring the stability and efficiency of the equipment operation.

[0038] In this embodiment, the fluidic device 9 comprises an inner cylinder 91, an outer cylinder 92, a screw 93, a slider 94, and a pressure differential drive assembly 95. The outer cylinder 92 is fixed to the pump body 1, and the inner cylinder 91 is rotatably mounted within the outer cylinder 92. The bottom end surface of the inner cylinder 91 is provided with a plurality of first spray holes spaced circumferentially, while the bottom end surface of the outer cylinder 92 is provided with a plurality of second spray holes located at positions corresponding to the first spray holes. The outer cylinder 92 is connected to the inlet pipe. The screw 93 is located within the outer cylinder 92, with one end extending into the inner cylinder 91. The slider 94 is fitted onto the screw 93 via its internal threads and engages with the external threads of the screw 93. The pressure differential drive assembly 95 comprises a plurality of first connecting rods 951, a plurality of second connecting rods 952, and a plurality of third elastic members 953. The plurality of first connecting rods 951 are spaced circumferentially, with one end fixedly connected to the inner wall of the outer cylinder 92 and the other end being free and positioned above the inner cylinder 91. Specifically, the free ends of multiple first connecting rods 951 form a circular structure, and the screw rod 93 sequentially passes through the circular structure and the top of the inner cylinder 91 and extends into it. Multiple second connecting rods 952 are arranged at intervals along the circumference, with one end fixedly connected to the inner wall of the inner cylinder 91 and the other end fixedly connected to the slider 94. The ends of multiple third elastic members 953 are respectively connected to the top of the screw rod 93 and the free ends of the first connecting rods 951.

[0039] It should be noted that in the fluidic device 9 of the embodiment of the present application, the outer cylinder 92 is connected to the inlet pipeline, and the inner cylinder 91 is axially rotatable and sleeved within the outer cylinder 92. When the gas content of the inlet pipeline increases, the generated thrust causes the screw 93 to move axially downward, thereby compressing the third elastic member 953. Because the slider 94 is threadedly connected to the screw 93 and circumferentially fixed to the inner wall of the inner cylinder 91 via the second connecting rod 952, when the screw 93 moves downward, the slider 94 rotates circumferentially and drives the inner cylinder 91 to rotate via the second connecting rod 952, thereby changing the overlap between the first nozzle on the inner cylinder 91 and the second nozzle on the outer cylinder 92. Conversely, when the gas content of the inlet pipeline decreases, the third elastic member 953 drives the screw 93 upward, thereby causing the inner cylinder 91 to rotate in the opposite direction.

[0040] The present application uses pressure difference drive to achieve adaptive matching of jet flow and gas content: when the gas content increases, the overlap between the first nozzle and the second nozzle is increased, which can improve the jet intensity and enhance the gas phase breakup effect; the device does not require an external power source, and realizes dynamic adjustment through mechanical structure linkage, with rapid response and high reliability; the overall design is compact, can accurately match the state of the gas-liquid mixed medium, effectively avoid gas phase agglomeration, improve the adaptability of the pump body 1 to complex working conditions, and reduce operation fluctuations caused by uneven gas-liquid distribution.

[0041] Specifically, when third elastic member 953 is in its natural state, the first and second spray holes do not overlap; as screw rod 93 moves downward, they gradually overlap. Furthermore, a stopper is provided on the inner wall of outer cylinder 92, and a corresponding boss is provided on the outer wall of inner cylinder 91. When inner cylinder 91 rotates to a certain degree, the boss abuts the stopper, preventing further rotation and preventing excessive overlap between the first and second spray holes due to excessive air void fraction.

[0042] The present invention provides a method for mixed gas-liquid transportation, including the above-mentioned mixed gas-liquid transportation pump, and further comprising: S1: The gas-liquid mixed medium enters the suction chamber 11 through the inlet pipeline, and the gas phase agglomerates are preliminarily broken by the bubble dispersion plate 7 in the suction chamber 11.

[0043] S2: The jet device 9 extracts part of the gas-liquid mixed medium from the gas-liquid mixed medium, accelerates it into a high-speed jet, and then directly injects it into the inlet area of ​​the premixing impeller 8, using the jet impact force to perform secondary crushing on the gas phase.

[0044] S3: The gas-liquid mixed medium after secondary crushing enters the premixing impeller 8, and is initially mixed by the rotation and stirring of the premixing impeller 8, and then is transported to the centrifugal impeller 3 for pressurization.

[0045] S4: The high-speed gas-liquid mixed medium pressurized by the centrifugal impeller 3 enters the diffuser 6. The flow channel structure of the diffuser 6 reduces the flow velocity of the gas-liquid mixed medium, converts kinetic energy into pressure energy, and suppresses the separation of the gas phase from the liquid phase.

[0046] S5: The gas-liquid mixed medium that has completed pressure expansion is collected by the extrusion chamber 12 and transported to the outlet pipeline.

[0047] It should be noted that this method performs fine processing on the gas-liquid mixed medium in stages, effectively improving the uniformity of the gas-liquid mixing, reducing the risk of gas phase agglomeration and separation, significantly enhancing the stability and efficiency of gas-liquid mixed transportation, and can adapt to more complex gas-liquid mixed transportation conditions.

[0048] In the embodiment of the present application, in step S4, the diffuser 6 automatically switches the diffusion stages according to the real-time gas content of the gas-liquid mixed medium, including: S41: When the air holdup is ≤10%, the inner cone 62, middle cone 63, and outer cone 64 of the diffuser 6 are flush near the inlet of the extrusion chamber 12, forming a primary diffusion channel with the inner cone 62. At this point, the first elastic member 69 and the second elastic member 691 are both in a preloaded state, and the middle cone 63 and outer cone 64 remain stationary under the action of the preload.

[0049] S42: When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member 691 and stretches the second elastic member 691. Since the elastic coefficient of the second elastic member 691 is smaller than the elastic coefficient of the first elastic member 69, the outer cone 64 moves along the slide rail 611 of the outer shell 61 toward the inlet of the extrusion chamber 12. At this time, the middle cone 63 remains stationary, forming a two-stage diffusion channel consisting of the inner cone 62 and the outer cone 64.

[0050] S43: When the gas content is greater than 20%, the aerodynamic thrust of the gas-liquid mixed medium simultaneously overcomes the preload of the second elastic member 691 and the first elastic member 69 and stretches both, causing the middle cone 63 and the outer cone 64 to move along the slide rail 611 of the outer shell 61 toward the inlet of the extrusion chamber 12, forming a three-stage diffusion channel consisting of the inner cone 62, the middle cone 63 and the outer cone 64.

[0051] It should be noted that under varying gas hold-up conditions, the precise control of the movement of the outer cone 64 and the middle cone 63, through the rational utilization of aerodynamic thrust and the coordination of the second elastic member 691 and the first elastic member 69 with different elastic coefficients, enables flexible switching between single-stage, two-stage, and three-stage diffusion channels. This dynamic adjustment method better adapts to the flow characteristics of gas-liquid mixtures at varying gas hold-up rates, optimizes the diffusion effect, effectively improves energy conversion efficiency, reduces medium flow losses, and enhances the adaptability and operational stability of the gas-liquid mixed transmission system to complex operating conditions.

[0052] In the embodiment of the present application, in step S2, the flow rate of the high-speed jet is dynamically controlled by rotating the inner cylinder 91 of the jet device 9 to change the overlap between the first nozzle and the second nozzle of the outer cylinder 92, including: S21: The gas content of the gas-liquid mixed medium is detected in real time. When the gas content increases, the driving member drives the inner cylinder 91 to rotate relative to the outer cylinder 92, thereby increasing the overlap between the first nozzle and the second nozzle, and increasing the flow rate of the high-speed jet to enhance the secondary crushing effect on the gas phase and avoid gas phase agglomeration.

[0053] S22: When the air void fraction decreases, the driver drives the inner cylinder 91 to rotate in the opposite direction, reducing the overlap between the first and second nozzles. This reduces the high-speed jet flow rate, ensuring effective fragmentation while minimizing energy loss. The driver's action is controlled by the air void fraction signal detected by the air void fraction sensor, achieving dynamic matching between the high-speed jet flow rate and the air void fraction.

[0054] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0055] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A gas-liquid mixed transport pump, characterized in that: It includes a pump body (1), a bearing housing (2), a premixing impeller (8), a centrifugal impeller (3), a rotating shaft (4), a mechanical seal assembly (5), a diffuser (6) and a bubble dispersion plate (7); The front end of the pump body (1) is provided with a suction chamber (11), and the top is provided with an extrusion chamber (12); the pump body (1) is detachably connected to the bearing box (2), and the suction chamber (11) is connected to the inlet pipeline; the bubble dispersion plate (7) is arranged in the suction chamber (11); The rotating shaft (4) passes through the bearing box (2) and extends into the pump body (1); the mechanical seal assembly (5) is sleeved on the rotating shaft (4) and located in the bearing box (2); The premixing impeller (8) and the centrifugal impeller (3) are spaced apart along the rotating shaft (4) and are located in the pump body (1), and the outlet of the premixing impeller (8) is in fluid communication with the inlet of the centrifugal impeller (3); The side wall of the suction chamber (11) is provided with a jet device (9), which is connected to the inlet pipeline and is used to accelerate part of the gas-liquid mixed medium in the inlet pipeline into a high-speed jet, and directly spray it into the inlet area of ​​the premixing impeller (8) to break up gas phase agglomeration; The diffuser (6) is arranged between the outlet of the centrifugal impeller (3) and the inlet of the extrusion chamber (12), and is used to reduce the flow rate of the gas-liquid mixed medium to inhibit the gas phase from separating from the liquid phase; the outlet of the extrusion chamber (12) is connected to the outlet pipeline.

2. The gas-liquid mixed transmission pump according to claim 1, characterized in that: The diffuser (6) comprises an outer shell (61), an inner cone (62), a middle cone (63), an outer cone (64), a first limiting ring (65), a second limiting ring (66), a first elastic sealing ring (67), a second elastic sealing ring (68), a plurality of first elastic members (69), a plurality of second elastic members (691), and a plurality of connecting rods (692); The two ends of the housing (61) are respectively fixedly connected to the outlet of the centrifugal impeller (3) and the inlet of the extrusion chamber (12); a plurality of slide rails (611) are provided at intervals in the circumferential direction of the inner wall of the housing (61); each of the slide rails (611) extends along the axial direction of the housing (61); The inner cone (62), the middle cone (63) and the outer cone (64) are all coaxially arranged in the outer shell (61); the inner cone (62) is fixedly connected to the outlet of the centrifugal impeller (3); the middle cone (63) is coaxially sleeved on the outer side of the inner cone (62) and slidably connected to the slide rail (611) of the outer shell (61); the outer cone (64) is coaxially sleeved on the outer side of the middle cone (63) and slidably connected to the slide rail (611) of the outer shell (61); the tapers of the inner cone (62), the middle cone (63) and the outer cone (64) increase in sequence, and their large ends all face the inlet of the extrusion chamber (12); The outer wall of the top of the inner cone (62) and the outer wall of the top of the middle cone (63) are respectively provided with a first limiting ring (65) and a second limiting ring (66), the first limiting ring (65) is used to limit the maximum movement stroke of the middle cone (63) toward the inlet of the extrusion chamber (12), and the second limiting ring (66) is used to limit the maximum movement stroke of the outer cone (64) toward the inlet of the extrusion chamber (12); the inner wall of the bottom of the middle cone (63) and the inner wall of the bottom of the outer cone (64) are respectively provided with a first elastic sealing ring (67) and a second elastic sealing ring (68), and when the middle cone (63) and the outer cone (64) move along the slide rail (611), the first elastic sealing ring (67) and the second elastic sealing ring (68) always elastically abut against the outer wall of the inner cone (62) and the outer wall of the middle cone (63); A plurality of connecting rods (692) are fixedly connected to the inner wall of the housing (61) at intervals along the circumferential direction, close to the outlet of the centrifugal impeller (3); The two ends of the plurality of first elastic members (69) are respectively connected to the circumference of the bottom of the middle cone (63) and the corresponding connecting rod (692); the two ends of the plurality of second elastic members (691) are respectively connected to the circumference of the bottom of the outer cone (64) and the corresponding connecting rod (692); the elastic coefficient of the second elastic member (691) is smaller than the elastic coefficient of the first elastic member (69); When the gas content is ≤10%, the inner cone (62), the middle cone (63) and the outer cone (64) are flush with one end close to the inlet of the extrusion chamber (12), and the inner cone (62) forms a first-stage pressure diffusion channel; at this time, the first elastic member (69) and the second elastic member (691) are both in a pre-tightened state, and the middle cone (63) and the outer cone (64) remain stationary under the action of the pre-tightening force; When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member (691) and stretches the second elastic member (691), causing the outer cone (64) to move along the slide rail (611) toward the inlet of the extrusion chamber (12). At this time, the middle cone (63) remains stationary, and two-stage diffusion channels are formed between the inner cone (62) and the outer cone (64). When the gas content is greater than 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member (691) and the preload of the first elastic member (69), and stretches the second elastic member (691) and the first elastic member (69), so that the middle cone (63) and the outer cone (64) move along the slide rail (611) toward the inlet of the extrusion chamber (12), and the inner cone (62), the middle cone (63) and the outer cone (64) form a three-stage diffusion channel.

3. The gas-liquid mixed transmission pump according to claim 2, characterized in that: When the air content is ≤10%, the inner cone (62), the middle cone (63) and the outer cone (64) are flush with each other at one end close to the inlet of the extrusion chamber (12), and the position of the middle cone (63) close to the outlet of the centrifugal impeller (3) is lower than the position of the outer cone (64) close to the outlet of the centrifugal impeller (3); a plurality of first limit blocks (631) are provided at intervals in the circumferential direction of the outer wall of the middle cone (63), and the first limit blocks (631) are located below the outer cone (64); A plurality of second limiting blocks (641) corresponding to the first limiting blocks (631) are provided at intervals in the circumferential direction on the outer wall of the outer cone (64); Each of the first limiting blocks (631) and the corresponding second limiting blocks (641) are respectively slidably arranged in the same slide rail (611).

4. The gas-liquid mixed transmission pump according to claim 2, characterized in that: The end surface of the first limiting ring (65) facing the first elastic sealing ring (67) and the end surface of the second limiting ring (66) facing the second elastic sealing ring (68) are both provided with a first tooth profile; The first elastic sealing ring (67) and the second elastic sealing ring (68) are both provided with a second tooth profile corresponding to the first tooth profile on one side facing the first limiting ring (65) and the second limiting ring (66), so that when the middle cone (63) or the outer cone (64) moves to the limiting position, a seal is formed by the engagement of the first tooth profile with the second tooth profile.

5. The gas-liquid mixed transmission pump according to claim 1, characterized in that: The suction chamber (11) is an axially tapered conical structure, with its large end being connected to the inlet pipeline.

6. The gas-liquid mixed transmission pump according to claim 1, characterized in that: The jet device (9) comprises an inner cylinder (91), an outer cylinder (92), a driving member and a gas content sensor; The outer cylinder (92) is fixed to the pump body (1), and the inner cylinder (91) is rotatably sleeved inside the outer cylinder (92); The bottom end surface of the inner cylinder (91) is provided with a plurality of first spray holes spaced circumferentially, and the bottom end surface of the outer cylinder (92) is provided with a plurality of second spray holes at positions corresponding to the first spray holes; the outer cylinder (92) is connected to the inlet pipe; The gas content sensor is installed in the flow channel of the pump body (1) and is used to detect the gas content of the gas-liquid mixed medium in real time; The driving member is fixed to the pump body (1), and its output end is connected to the inner cylinder (91); The gas content sensor is connected to the driving member by signal; when a change in the gas content is detected, the driving member drives the inner cylinder (91) to rotate, and adjusts the jet flow rate of the jet device (9) by changing the overlap between the first nozzle hole and the second nozzle hole.

7. The gas-liquid mixed transmission pump according to claim 1, characterized in that: The jet device (9) comprises an inner cylinder (91), an outer cylinder (92), a screw rod (93), a slider (94) and a pressure difference drive assembly (95); The outer cylinder (92) is fixed to the pump body (1), and the inner cylinder (91) is rotatably sleeved in the outer cylinder (92); a plurality of first spray holes are provided on the bottom end surface of the inner cylinder (91) at intervals in the circumferential direction, and a plurality of second spray holes are provided on the bottom end surface of the outer cylinder (92) at positions corresponding to the first spray holes; The outer cylinder (92) is connected to the inlet pipeline; The screw rod (93) is located in the outer cylinder (92), and one end thereof extends into the inner cylinder (91); The slider (94) is sleeved on the screw rod (93) through its internal thread and meshes with the external thread of the screw rod (93); the pressure difference drive assembly (95) includes: A plurality of first connecting rods (951) are arranged at intervals along the circumferential direction, one end of each connecting rod is fixedly connected to the inner wall of the outer cylinder (92), and the other end is a free end and is located above the inner cylinder (91); a plurality of second connecting rods (952) arranged at intervals along the circumferential direction, one end of which is fixedly connected to the inner wall of the inner cylinder (91), and the other end of which is fixedly connected to the slider (94); a plurality of third elastic members (953), both ends of which are respectively connected to the top of the screw rod (93) and the free end of the first connecting rod (951); When the gas content of the inlet pipeline increases, the thrust generated by the gas-liquid mixed medium pushes the screw rod (93) to move axially downward to compress the third elastic member (953); at the same time, the slider (94) rotates circumferentially due to the threaded engagement with the screw rod (93), and drives the inner cylinder (91) to rotate synchronously through the second connecting rod (952) to change the overlap between the first spray hole and the second spray hole.

8. A gas-liquid mixed transport method, characterized in that: The gas-liquid mixed transmission pump according to any one of claims 1 to 7 further comprises: S1: The gas-liquid mixed medium enters the suction chamber (11) through the inlet pipe, and the gas phase agglomerates are initially broken up by the bubble dispersion plate (7) in the suction chamber (11); S2: The jet device (9) extracts part of the gas-liquid mixed medium from the gas-liquid mixed medium, accelerates it into a high-speed jet, and then directly injects it into the inlet area of ​​the premixing impeller (8), using the jet impact force to perform secondary crushing on the gas phase; S3: The gas-liquid mixed medium after secondary crushing enters the premixing impeller (8), and is initially mixed by the rotation and stirring of the premixing impeller (8), and then is transported to the centrifugal impeller (3) for pressurization; S4: The high-speed gas-liquid mixed medium pressurized by the centrifugal impeller (3) enters the diffuser (6), and the flow channel structure of the diffuser (6) reduces the flow velocity of the gas-liquid mixed medium, converts kinetic energy into pressure energy, and suppresses the separation of the gas phase from the liquid phase; S5: The gas-liquid mixed medium that has completed the pressure expansion is collected by the extrusion chamber (12) and transported to the outlet pipeline.

9. The gas-liquid mixed transmission method according to claim 8, characterized in that: In step S4, the diffuser (6) automatically switches the diffusion stages according to the real-time gas content of the gas-liquid mixed medium, including: When the air content is ≤10%, the inner cone (62), the middle cone (63), and the outer cone (64) of the diffuser (6) are flush with one end close to the inlet of the extrusion chamber (12), and a first-stage diffusion channel is formed by the inner cone (62); at this time, the first elastic member (69) and the second elastic member (691) are both in a pre-tightened state, and the middle cone (63) and the outer cone (64) remain stationary under the action of the pre-tightening force; When the gas content is greater than 10% and less than or equal to 20%, the pneumatic thrust of the gas-liquid mixed medium overcomes the preload of the second elastic member (691) and stretches the second elastic member (691). Since the elastic coefficient of the second elastic member (691) is less than the elastic coefficient of the first elastic member (69), the outer cone (64) moves along the slide rail (611) of the outer shell (61) toward the inlet of the extrusion chamber (12). At this time, the middle cone (63) remains stationary, forming a two-stage expansion channel consisting of the inner cone (62) and the outer cone (64). When the gas content is greater than 20%, the pneumatic thrust of the gas-liquid mixed medium simultaneously overcomes the preload of the second elastic member (691) and the first elastic member (69) and stretches both, causing the middle cone (63) and the outer cone (64) to move along the slide rail (611) of the outer shell (61) toward the inlet of the extrusion chamber (12), forming a three-stage pressure diffusion channel consisting of the inner cone (62), the middle cone (63) and the outer cone (64).

10. The gas-liquid mixed transmission method according to claim 8, characterized in that: In step S2, the flow rate of the high-speed jet is dynamically controlled by rotating the inner cylinder (91) of the jet device (9) to change the overlap between the first jet hole and the second jet hole of the outer cylinder (92), including: The gas content of the gas-liquid mixed medium is detected in real time. When the gas content increases, the driving member drives the inner cylinder (91) to rotate relative to the outer cylinder (92), thereby increasing the overlap between the first spray hole and the second spray hole, thereby increasing the flow rate of the high-speed jet, thereby enhancing the secondary crushing effect on the gas phase and preventing gas phase agglomeration; When the gas content decreases, the driving member drives the inner cylinder (91) to rotate in the opposite direction, reducing the overlap between the first spray hole and the second spray hole, thereby reducing the flow rate of the high-speed jet, thereby ensuring the crushing effect and reducing energy loss.

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