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

Abstract

The application discloses a gas-liquid mixed delivery pump and a gas-liquid mixed delivery method, and relates to the technical field of pumps. The pump body is detachably connected to a bearing box; a bubble dispersion plate is arranged in a suction chamber; a rotating shaft penetrates through the bearing box and extends into the pump body, a mechanical seal assembly is sleeved on the rotating shaft and located in the bearing box; a premixing impeller and a centrifugal impeller are arranged at intervals along the rotating shaft and located in the pump body, the outlet of the premixing impeller is in fluid communication with the inlet of the centrifugal impeller; a side wall of the suction chamber is provided with a jet device; a diffuser is arranged between the outlet of the centrifugal impeller and the inlet of a discharge chamber; and the outlet of the discharge chamber is connected to an outlet pipeline. The two-stage crushing structure of the bubble dispersion plate and the jet device reduces the gas phase aggregation phenomenon, improves the gas-liquid mixing uniformity, and avoids the efficiency reduction of the centrifugal impeller caused by the gas phase aggregation; the diffuser can specifically inhibit the gas-liquid separation, cooperates with the premixing effect of the premixing impeller, and widens the adaptation range of the pump body to different gas rate working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pumps, in particular to a gas-liquid mixed delivery pump and a gas-liquid mixed delivery method. BACKGROUND

[0002] In the fields of oil and gas exploitation, chemical industry, new energy and the like, efficient and stable delivery of gas-liquid two-phase medium is a core link for realizing safe optimization of the whole process and efficient utilization of resources.

[0003] A traditional centrifugal gas-liquid mixed delivery pump, as a mainstream device in the field, is designed based on the dynamic characteristics of single-phase fluid, and does work on the medium through centrifugal force generated by rotation of an impeller. However, under the condition of low inlet pressure and high gas rate, the gas-liquid two-phase medium undergoes non-uniform phase evolution in the flow passage of the impeller, and the gas phase is easy to coalesce to form discrete large gas clusters. The gas clusters can block the continuous flow path of the liquid phase, weaken the kinetic energy transmission efficiency between the impeller and the liquid phase, and cause the delivery efficiency of the mixed delivery pump to decrease sharply or even completely lose the working capacity, which seriously restricts the reliability and engineering application range of the mixed delivery pump in complex gas-liquid medium delivery scenarios. SUMMARY

[0004] The embodiments of the present application provide a gas-liquid mixed delivery pump and a gas-liquid mixed delivery method, which solve the problems in the background art.

[0005] In a first aspect, the embodiments of the present application provide a gas-liquid mixed delivery pump, comprising 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; a suction chamber is arranged at a front end of the pump body, and a discharge chamber is arranged at a top of the pump body; the pump body is detachably connected to the bearing box, and the suction chamber is connected to an inlet pipeline; the bubble dispersion plate is arranged in the suction chamber; the rotating shaft penetrates through the bearing box and extends into the pump body, and the mechanical seal assembly is sleeved on the rotating shaft 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 side wall of the suction chamber is provided with a jet device connected to the inlet pipeline, which is used to accelerate part of gas-liquid mixed medium of the inlet pipeline into high-speed jet flow, and directly inject the high-speed jet flow into an inlet area of the premixing impeller to break up the gas phase clusters; the diffuser is arranged between an outlet of the centrifugal impeller and an inlet of the discharge 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; and an outlet of the discharge chamber is connected to an outlet pipeline.

[0006] In a possible implementation manner of the first aspect, the diffuser comprises 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; two ends of the outer shell are fixedly connected to an outlet of the centrifugal impeller and an inlet of the discharge chamber respectively, and a plurality of slide rails are arranged on the inner wall of the outer shell in a circumferential direction and extend along an axial direction of the outer shell; the inner cone, the middle cone and the outer cone are 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 is slidably connected to the slide rails of the outer shell, and the outer cone is coaxially sleeved on the outer side of the middle cone and is slidably connected to the slide rails of the outer shell; the taper of the inner cone, the middle cone and the outer cone increases in sequence, and the large end of each of the inner cone, the middle cone and the outer cone is directed to the inlet of the discharge chamber; the outer wall of the top of the inner cone and the outer wall of the top of the middle cone are respectively provided with the first limiting ring and the second limiting ring, the first limiting ring is used for limiting the maximum moving stroke of the middle cone in the direction of the inlet of the discharge chamber, and the second limiting ring is used for limiting the maximum moving stroke of the outer cone in the direction of the inlet of the discharge 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 the first elastic sealing ring and the second elastic sealing ring, and the first elastic sealing ring and the second elastic sealing ring are always elastically abutted on the outer wall of the inner cone and the outer wall of the middle cone in the process of moving of the middle cone and the outer cone along the slide rails; a plurality of the connecting rods are fixedly connected to the inner wall of the outer shell near the outlet of the centrifugal impeller in a circumferential direction; two ends of a plurality of the first elastic members are respectively connected to the circumferential direction of the bottom of the middle cone and the corresponding connecting rods; two ends of a plurality of the second elastic members are respectively connected to the circumferential direction 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.

[0007] When the gas content is less than or equal to 10%, the end of the inner cone, the middle cone and the outer cone near the inlet of the discharge chamber is flush, and the inner cone forms a first-stage diffuser passage; at this time, the first elastic member and the second elastic member are both in a pre-tightening state, and the middle cone and the outer cone are kept stationary under the action of the pre-tightening force.

[0008] When the gas content is greater than 10% and less than or equal to 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member and stretches the second elastic member, so that the outer cone moves along the slide rails in the direction of the inlet of the discharge chamber; at this time, the middle cone is kept stationary, and two-stage diffuser passages are respectively formed between the inner cone and the outer cone.

[0009] When the gas content is greater than 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member and the pre-tightening force 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 are both moved along the slide rail to the direction of the discharge chamber inlet, and the inner cone, the middle cone and the outer cone form a three-stage diffuser passage.

[0010] In combination with the first aspect, in a possible implementation manner, when the gas content is less than or equal to 10%, the inner cone, the middle cone and the outer cone are flush at one end close to the discharge chamber inlet, and the position of the middle cone close to the outlet of the centrifugal impeller is lower than the position of the outer cone close to the outlet of the centrifugal impeller; the outer wall of the middle cone is circumferentially spaced to be provided with a plurality of first limiting blocks, and the first limiting blocks are below the outer cone; the outer wall of the outer cone is circumferentially spaced to be provided with a plurality of second limiting blocks corresponding to the first limiting blocks; each first limiting block and the corresponding second limiting block are respectively and slidingly arranged in the same slide rail.

[0011] In combination with the first aspect, in a possible implementation manner, the end face of the first limiting ring towards the side of the first elastic sealing ring and the end face of the second limiting ring towards the side of the second elastic sealing ring are both provided with a first tooth type; the side of the first elastic sealing ring and the side of the second elastic sealing ring towards the first limiting ring and the second limiting ring are both provided with a second tooth type corresponding to the first tooth type, so as to form a seal through the engagement of the first tooth type and the second tooth type when the middle cone or the outer cone moves to the limiting position.

[0012] In combination with the first aspect, in a possible implementation manner, the suction chamber is a tapered structure in an axial direction, and a large end of the tapered structure is connected to the inlet pipeline.

[0013] In combination with the first aspect, in a possible implementation manner, the jet flow device comprises an inner cylinder, an outer cylinder, a driving member and a gas content sensor; the outer cylinder is fixed to the pump body, and the inner cylinder is rotatably sleeved in the outer cylinder; a plurality of first injection holes are circumferentially spaced apart on the bottom end face of the inner cylinder, and a plurality of second injection holes are provided on the bottom end face of the outer cylinder corresponding to the positions of the first injection holes; the outer cylinder is connected to the inlet pipeline; the gas content sensor is installed in the flow channel of the pump body, 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, and an output end of the driving member is connected to the inner cylinder; the gas content sensor is in signal connection with the driving member; when the change of the gas content is detected, the driving member drives the inner cylinder to rotate, so as to adjust the jet flow of the jet flow device by changing the coincidence degree of the first injection hole and the second injection hole.

[0014] With reference to the first aspect, in a possible implementation manner, the jet flow device comprises an inner cylinder, an outer cylinder, a screw rod, a sliding block and a pressure difference driving assembly; the outer cylinder is fixed to the pump body, and the inner cylinder is rotatably sleeved in the outer cylinder; a plurality of first injection holes are arranged on the bottom end surface of the inner cylinder in a circumferential direction; a plurality of second injection holes are arranged on the bottom end surface of the outer cylinder in positions corresponding to the first injection holes; the outer cylinder is connected to the inlet pipeline; the screw rod is located in the outer cylinder and has one end extending into the inner cylinder; the sliding block is sleeved on the screw rod through internal threads and is engaged with external threads of the screw rod; the pressure difference driving assembly comprises: a plurality of first connecting rods arranged in a circumferential direction, one end of each first connecting rod being fixedly connected to an inner wall of the outer cylinder and the other end being a free end and located above the inner cylinder; a plurality of second connecting rods arranged in a circumferential direction, one end of each second connecting rod being fixedly connected to an inner wall of the inner cylinder and the other end being fixedly connected to the sliding block; and a plurality of third elastic members, two ends of each third elastic member being connected to the top of the screw rod and the free end of the first connecting rod.

[0015] When the gas content of the inlet pipeline increases, the thrust generated by the gas-liquid mixed medium drives the screw rod to move downward along the axial direction to compress the third elastic member; at the same time, the sliding block rotates in a circumferential direction due to the thread cooperation with the screw rod, and drives the inner cylinder to rotate synchronously through the second connecting rods, so as to change the coincidence degree of the first injection holes and the second injection holes.

[0016] In the second aspect, the embodiments of the present application provide a gas-liquid mixed conveying method, comprising the gas-liquid mixed conveying pump of the first aspect or any possible implementation manner of the first aspect, and further comprising:

[0017] S1: The gas-liquid mixed medium enters the suction chamber through the inlet pipeline, and the gas phase clusters are preliminarily broken by the bubble dispersion plate in the suction chamber;

[0018] S2: The jet flow device extracts part of the gas-liquid mixed medium from the gas-liquid mixed medium, accelerates the extracted part into a high-speed jet flow, and directly sprays the high-speed jet flow into the inlet area of the premixing impeller, so as to break the gas phase for the second time by using the jet impact force;

[0019] S3: The gas-liquid mixed medium broken for the second time enters the premixing impeller, and the gas-liquid mixed medium is preliminarily mixed by the rotation and stirring of the premixing impeller, and then is conveyed to the centrifugal impeller for pressure boosting;

[0020] S4: The high-speed gas-liquid mixed medium boosted by the centrifugal impeller enters the diffuser, and the flow channel structure of the diffuser (6) reduces the flow rate of the gas-liquid mixed medium, converts kinetic energy into pressure energy, and suppresses the gas phase from separating from the liquid phase;

[0021] S5: The gas-liquid mixed medium completing the pressure boosting is collected through the discharge chamber and then is conveyed to the outlet pipeline.

[0022] With reference to the second aspect, in a possible implementation manner, in step S4, the diffuser automatically switches the number of expansion stages according to the real-time gas content of the gas-liquid mixed medium, including:

[0023] When the gas content is less than or equal to 10%, the inner cone, the middle cone and the outer cone of the diffuser are flush at the end close to the inlet of the discharge chamber, and a first-stage expansion channel is formed by the inner cone; at this time, the first elastic member and the second elastic member are both in a pre-tightening state, and the middle cone and the outer cone remain stationary under the pre-tightening force;

[0024] When the gas content is greater than 10% and less than or equal to 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force 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 towards the direction of the inlet of the discharge chamber, at this time, the middle cone remains stationary, forming a two-stage expansion channel composed of the inner cone and the outer cone;

[0025] When the gas content is greater than 20%, the aerodynamic thrust of the gas-liquid mixed medium simultaneously overcomes the pre-tightening force of the second elastic member and the first elastic member and stretches both of them, so that the middle cone and the outer cone both move along the slide rail of the outer shell towards the direction of the inlet of the discharge chamber, forming a three-stage expansion channel composed of the inner cone, the middle cone and the outer cone.

[0026] With reference to the second aspect, in a possible implementation manner, in step S2, the flow rate of the high-speed jet is dynamically controlled by rotating the inner cylinder of the rotary jet adjusting device to change the coincidence degree of the first nozzle hole of the inner cylinder and the second nozzle hole of the outer cylinder, including:

[0027] The gas content of the gas-liquid mixed medium is detected in real time, when the gas content increases, the inner cylinder is rotated relative to the outer cylinder by the driving member, the coincidence degree of the first nozzle hole and the second nozzle hole is increased, the flow rate of the high-speed jet is increased, the secondary breaking effect on the gas phase is enhanced, and the agglomeration of the gas phase is avoided;

[0028] When the gas content decreases, the inner cylinder is reversely rotated by the driving member, the coincidence degree of the first nozzle hole and the second nozzle hole is reduced, and the flow rate of the high-speed jet is reduced, so as to reduce energy loss while ensuring the breaking effect.

[0029] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0030] The gas-liquid mixed delivery pump provided by the embodiment of the application comprises 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 gas-liquid mixed medium first enters an intake chamber at the front end of the pump body, and the gas phase agglomerates are preliminarily broken by the bubble dispersion plate in the intake chamber; at the same time, the jet device on the side wall of the intake chamber accelerates part of the gas-liquid mixed medium in the inlet pipeline into a high-speed jet, which is directly injected into the inlet area of the premixing impeller to break the gas phase for a second time to further refine the bubbles. The gas-liquid mixed medium subjected to the breaking treatment enters the premixing impeller, and is preliminarily mixed under the rotating stirring action of the premixing impeller, and then is delivered from the outlet of the premixing impeller to the inlet of the centrifugal impeller to obtain sufficient kinetic energy through the rotating pressurization of the centrifugal impeller. The high-speed gas-liquid mixed medium after pressurization enters the diffuser arranged between the outlet of the centrifugal impeller and the inlet of the discharge chamber, and the flow rate is reduced in the diffuser, the kinetic energy is converted into pressure energy, and the gas phase is effectively inhibited from separating from the liquid phase. Finally, the gas-liquid mixed medium is collected by the discharge chamber and then output by the outlet pipeline. On the one hand, through the two-stage breaking structure of the bubble dispersion plate and the jet device, the gas phase agglomeration phenomenon is greatly reduced, the gas-liquid mixing uniformity is improved, and the efficiency decline of the centrifugal impeller due to the gas phase aggregation is avoided; on the other hand, the diffuser can specifically inhibit the gas-liquid separation, cooperate with the premixing effect of the premixing impeller, significantly widen the adaptation range of the pump body to different gas-liquid ratio working conditions, especially still maintain stable pressurization and delivery capacity in the high gas-liquid ratio scene, reduce the vibration, noise and part wear risk caused by gas-liquid separation, and prolong the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0032] Figure 1 The structural schematic diagram of the gas-liquid mixed delivery pump provided by the embodiment of the application;

[0033] Figure 2 The structural schematic diagram of the primary diffuser passage provided by the embodiment of the application;

[0034] Figure 3 The sectional view of Figure 2 ;

[0035] Figure 4 The structural schematic diagram of the secondary diffuser passage provided by the embodiment of the application;

[0036] Figure 5 The sectional view of Figure 4 ;

[0037] Figure 6 A structural schematic diagram of a three-stage pressure expansion channel provided by an embodiment of the present application is shown in the figure.

[0038] Figure 7 A structural schematic diagram of a connecting rod provided by an embodiment of the present application is shown in the figure.

[0039] Figure 8 A structural schematic diagram of a first limiting block provided by an embodiment of the present application is shown in the figure.

[0040] Figure 9 A structural schematic diagram of a first limiting block and a second limiting block provided by an embodiment of the present application is shown in the figure.

[0041] Figure 10 A structural schematic diagram of an outer cone provided by an embodiment of the present application is shown in the figure.

[0042] Figure 11 A flow principle diagram of a pressure expander provided by an embodiment of the present application is shown in the figure.

[0043] Figure 12 A structural schematic diagram of an inner cylinder and an outer cylinder provided by an embodiment of the present application is shown in the figure.

[0044] Figure 13 A structural schematic diagram of a first jet hole and a second jet hole provided by an embodiment of the present application is shown in the figure.

[0045] Figure 14 A structural schematic diagram of a pressure difference driving assembly provided by an embodiment of the present application is shown in the figure.

[0046] Figure 15 A structural schematic diagram of a second connecting rod provided by an embodiment of the present application is shown in the figure.

[0047] Icon: 1-pump body; 11-suction chamber; 12-pressing-out chamber; 2-bearing box; 3-centrifugal impeller; 4-rotary shaft; 5-mechanical sealing assembly; 6-pressure expander; 61-outer shell; 611-sliding rail; 62-inner cone; 63-middle cone; 631-first limiting block; 64-outer cone; 641-second limiting block; 65-first limiting ring; 66-second limiting ring; 67-first elastic sealing ring; 68-second elastic sealing ring; 69-first elastic member; 691-second elastic member; 692-connecting rod; 7-bubble dispersing plate; 8-premixing impeller; 9-jet device; 91-inner cylinder; 92-outer cylinder; 93-screw rod; 94-sliding block; 95-pressure difference driving assembly; 951-first connecting rod; 952-second connecting rod; 953-third elastic member. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Specifically, the taper angle of the axially tapered conical structure is 8-15°, for improving the liquid medium flow rate and enhancing the inlet turbulent effect of the premixing impeller 8.

[0053] In the embodiment of the application, the premixing impeller 8 is a full-open cyclone impeller or a spiral impeller.

[0054] It should be noted that the high shear stress generated by the strong swirling field of the full-open cyclone impeller or the continuous torsional shear caused by the spiral flow channel of the spiral impeller implements deep refinement processing on the gas-liquid mixed medium, so that the gas phase is fully dispersed into micron-sized bubbles and uniformly embedded in the liquid phase continuum before entering the centrifugal impeller 3, thereby reducing the phenomenon of agglomeration of the gas in the flow channel of the centrifugal impeller 3.

[0055] It should be noted that the gas-liquid mixed medium first enters the suction chamber 11 at the front end of the pump body 1, and the gas bubble dispersion plate 7 in the suction chamber 11 preliminarily breaks the gas phase agglomerates; at the same time, the jet device 9 on the side wall of the suction chamber 11 accelerates part of the gas-liquid mixed medium in the inlet pipeline into a high-speed jet, which is directly injected into the inlet area of the premixing impeller 8 to further refine the gas bubbles by secondary breaking of the gas phase. The gas-liquid mixed medium subjected to breaking treatment enters the premixing impeller 8, and preliminary mixing is realized under the rotating stirring action of the premixing impeller 8, and then is delivered from the outlet of the premixing impeller 8 to the inlet of the centrifugal impeller 3 to obtain sufficient kinetic energy through the rotational pressurization of the centrifugal impeller 3. The high-speed gas-liquid mixed medium after pressurization enters the diffuser 6 arranged between the outlet of the centrifugal impeller 3 and the inlet of the discharge chamber 12, and the flow rate is reduced in the diffuser 6, and the kinetic energy is converted into pressure energy, effectively inhibiting the gas phase from separating from the liquid phase. Finally, the gas-liquid mixed medium is collected through the discharge chamber 12 and then output through the outlet pipeline. On the one hand, through the two-stage breaking structure of the gas bubble dispersion plate 7 and the jet device 9, the gas phase agglomeration phenomenon is greatly reduced, the gas-liquid mixing uniformity is improved, and the efficiency decline of the centrifugal impeller 3 due to gas phase aggregation is avoided; on the other hand, the diffuser 6 can specifically inhibit gas-liquid separation, cooperate with the premixing effect of the premixing impeller 8, and significantly widen the adaptation range of the pump body 1 to different gas-liquid ratio working conditions, especially still maintain stable pressurization and conveying capacity in high gas-liquid ratio scenarios, reduce the risk of vibration, noise and component wear caused by gas-liquid separation, and prolong the service life of the equipment.

[0056] In the embodiment of the 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.

[0057] The two ends of the shell 61 are fixedly connected to the outlet of the centrifugal impeller 3 and the inlet of the discharge chamber 12 respectively, and a plurality of sliding rails 611 are circumferentially and spaced apart on the inner wall of the shell 61 and each extend along the axial direction of the shell 61. The inner cone 62, the middle cone 63 and the outer cone 64 are coaxially arranged in the shell 61, the inner cone 62 is fixedly connected to the outlet of the centrifugal impeller 3, the middle cone 63 is coaxially sleeved outside the inner cone 62 and is slidingly connected to the sliding rails 611 of the shell 61, and the outer cone 64 is coaxially sleeved outside the middle cone 63 and is slidingly connected to the sliding rails 611 of the shell 61. The tapers of the inner cone 62, the middle cone 63 and the outer cone 64 increase in turn, and the large ends of the inner cone 62, the middle cone 63 and the outer cone 64 all face the inlet of the discharge 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 moving stroke of the middle cone 63 in the direction of the inlet of the discharge chamber 12, and the second limiting ring 66 is used to limit the maximum moving stroke of the outer cone 64 in the direction of the inlet of the discharge 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 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 in the process that the middle cone 63 and the outer cone 64 move along the sliding rails 611. Specifically, when the outer cone 64 and the middle cone 63 move, the gas-liquid mixed medium entering the first elastic sealing ring 67 and the second elastic sealing ring 68 from the upper part will be pushed into the top 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 end of the shell 61 close to the outlet of the centrifugal impeller 3 in a circumferential direction. The two ends of a plurality of first elastic members 69 are respectively connected to the circumferential direction of the bottom of the middle cone 63 and the corresponding connecting rods 692. The two ends of a plurality of second elastic members 691 are respectively connected to the circumferential direction of the bottom of the outer cone 64 and 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.

[0058] When the gas content is ≤10%, the end of the inner cone 62, the middle cone 63 and the outer cone 64 close to the inlet of the discharge chamber 12 is flush, and the inner cone 62 forms a one-stage pressure-increasing passage. At this time, the first elastic member 69 and the second elastic member 691 are both in a pre-tightening state, and the middle cone 63 and the outer cone 64 remain stationary under the action of the pre-tightening force.

[0059] When the gas content is >10% and ≤20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member 691 and stretches the second elastic member 691, so that the outer cone 64 moves along the sliding rails 611 in the direction of the inlet of the discharge chamber 12, at this time, the middle cone 63 remains stationary, and the inner cone 62 and the outer cone 64 form two-stage pressure-increasing passages respectively.

[0060] When the gas content is greater than 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member 691 and the pre-tightening force 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 are both moved along the slide rail 611 to the inlet direction of the discharge chamber 12, and the inner cone 62, the middle cone 63 and the outer cone 64 form a three-stage diffuser passage.

[0061] It should be noted that the present application realizes self-adaptive switching of the number of diffuser 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 diffuser guarantees efficiency, and when the gas content is medium or high, the multi-stage increasing taper can slow down or avoid flow separation of the gas-liquid two-phase medium. When the gas content is large, the gas phase is easy to gather on the surface of the diffuser 6, and the multi-stage increasing taper forms surface vortex through angle mutation, enhances gas-liquid mixing, and uses vortex to re-entrain the gas phase gathered on the surface into the liquid phase after being impacted. The first elastic sealing ring 67 and the second elastic sealing ring 68 maintain sealing in dynamic adjustment to avoid medium leakage; the overall structure can match different working conditions without external control, significantly improves the adaptability of the pump body 1 to gas-liquid mixed medium, especially in high-gas-content scenarios, reduces flow loss and vibration noise, and prolongs the service life of the equipment.

[0062] In the embodiment of the present application, when the gas content is less than or equal to 10%, the inner cone 62, the middle cone 63 and the outer cone 64 are flush at one end close to the inlet of the discharge 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. The outer wall of the middle cone 63 is circumferentially spaced apart and provided with a plurality of first limiting blocks 631, and the first limiting blocks 631 are located below the outer cone 64. The outer wall of the outer cone 64 is circumferentially spaced apart and provided with a plurality of second limiting blocks 641 corresponding to the first limiting blocks 631. Each first limiting block 631 and the corresponding second limiting block 641 are respectively and slidingly arranged in the same slide rail 611.

[0063] It should be noted that when the gas content increases, the first limiting block 631 and the second limiting block 641 move independently in layers in the same slide rail 611, which is a very ingenious design. The same slide rail 611 provides a given movement path for the two, ensuring that they move accurately according to their respective rules, effectively avoiding movement interference, and at the same time accurately controlling the axial displacement difference between the middle cone 63 and the outer cone 64, ensuring stable operation of the equipment; specifically, a sealing layer is additionally arranged 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Specifically, when the third elastic member 953 is in a natural state, the first and second injection holes do not coincide; when the screw rod 93 is lowered, the two gradually coincide. In addition, the inner wall of the outer cylinder 92 is provided with a limiting piece, and the outer wall of the inner cylinder 91 is provided with a corresponding boss. When the inner cylinder 91 rotates to a certain extent, the boss abuts against the limiting piece, which can prevent the inner cylinder 91 from continuing to rotate, thereby avoiding excessive coincidence of the first injection hole and the second injection hole due to too high gas content.

[0071] The embodiment of the present application provides a gas-liquid mixed conveying method, comprising the gas-liquid mixed conveying pump, and further comprising:

[0072] 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.

[0073] S2: The jet device 9 extracts part of the gas-liquid mixed medium, accelerates the gas-liquid mixed medium into a high-speed jet flow, and directly sprays the high-speed jet flow into the inlet area of the premixing impeller 8, so as to realize secondary breaking of the gas phase by using the jet impact force.

[0074] S3: The gas-liquid mixed medium subjected to the secondary breaking enters the premixing impeller 8, and the gas-liquid mixed medium is preliminarily mixed by the rotation and stirring of the premixing impeller 8, and then is conveyed to the centrifugal impeller 3 for pressurization.

[0075] S4: The high-speed gas-liquid mixed medium subjected to the pressurization by the centrifugal impeller 3 enters the diffuser 6, and the flow rate of the gas-liquid mixed medium is reduced by the flow channel structure of the diffuser 6, kinetic energy is converted into pressure energy, and the gas phase is inhibited from separating from the liquid phase.

[0076] S5: The gas-liquid mixed medium subjected to the diffusing is collected in the discharge chamber 12 and then is conveyed to the outlet pipeline.

[0077] It should be noted that the method processes the gas-liquid mixed medium in stages, effectively improves the uniformity of the gas-liquid mixing, reduces the risk of gas phase agglomeration and separation, significantly enhances the stability and efficiency of the gas-liquid mixed conveying, and can adapt to more complex gas-liquid mixed conveying conditions.

[0078] In the embodiment of the present application, in step S4, the diffuser 6 automatically switches the diffusing stages according to the real-time gas content of the gas-liquid mixed medium, and the diffusing stages include:

[0079] S41: When the gas content is less than or equal to 10%, the inner cone 62, the middle cone 63 and the outer cone 64 of the diffuser 6 are flush with the inlet end of the discharge chamber 12, and a first-stage diffusing 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-tightening state, and the middle cone 63 and the outer cone 64 remain stationary under the action of the pre-tightening force.

[0080] S42: When the gas content is > 10% and ≤ 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member 691 and stretches the second elastic member 691, and since the elastic coefficient of the second elastic member 691 is smaller than that of the first elastic member 69, the outer cone 64 moves along the sliding rail 611 of the outer shell 61 to the inlet direction of the discharge chamber 12, at this time, the middle cone 63 remains stationary, forming a two-stage diffuser passage composed of the inner cone 62 and the outer cone 64.

[0081] S43: When the gas content is > 20%, the aerodynamic thrust of the gas-liquid mixed medium overcomes the pre-tightening force of the second elastic member 691 and the first elastic member 69 and stretches both of them, so that the middle cone 63 and the outer cone 64 move along the sliding rail 611 of the outer shell 61 to the inlet direction of the discharge chamber 12, forming a three-stage diffuser passage composed of the inner cone 62, the middle cone 63 and the outer cone 64.

[0082] It should be noted that under different gas content conditions, by reasonably utilizing the aerodynamic thrust and the cooperation of the second elastic member 691 and the first elastic member 69 with different elastic coefficients, the movement of the outer cone 64 and the middle cone 63 is precisely controlled, and the flexible switching of the one-stage, two-stage to three-stage diffuser passage is realized. This dynamic adjustment mode can better adapt to the flow characteristics of the gas-liquid mixed medium under different gas contents, optimize the diffuser effect, effectively improve the energy conversion efficiency, reduce the medium flow loss, and enhance the adaptability and operation stability of the gas-liquid mixing system to complex working conditions.

[0083] In the embodiment of the application, in step S2, the flow of the high-speed jet is dynamically controlled by rotating the inner cylinder 91 of the rotary jet adjusting device 9 to change the coincidence degree of the first nozzle hole and the second nozzle hole of the outer cylinder 92, including:

[0084] S21: Real-time detection of the gas content of the gas-liquid mixed medium, when the gas content increases, the drive member drives the inner cylinder 91 to rotate relative to the outer cylinder 92, increases the coincidence degree of the first nozzle hole and the second nozzle hole, increases the flow of the high-speed jet, and enhances the secondary breaking effect on the gas phase to avoid the agglomeration of the gas phase.

[0085] S22: When the gas content decreases, the drive member drives the inner cylinder 91 to rotate in the opposite direction, reduces the coincidence degree of the first nozzle hole and the second nozzle hole, and reduces the flow of the high-speed jet, while ensuring the breaking effect and reducing energy loss. Wherein the action of the drive member is controlled by the gas content signal detected by the gas content sensor, realizing the dynamic matching of the flow of the high-speed jet and the gas content.

[0086] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0087] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features thereof can be replaced by equivalents; and 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; 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); A plurality of slide rails (611) are provided at circumferential intervals on the inner wall of the outer shell (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); a plurality of connecting rods (692) are fixedly connected to the inner wall of the housing (61) near the outlet side of the centrifugal impeller (3) at intervals along the circumferential direction; 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).

2. The gas-liquid mixed transmission pump according to claim 1, characterized in that: 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), and each of the slide rails (611) extends along the axial direction of the housing (61); 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 against the outer wall of the inner cone (62) and the outer wall of the middle cone (63); 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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