A gas-liquid mixed transportation pump

Abstract

The present application discloses a gas-liquid mixed transportation pump, which relates to the technical field of mixed transportation pumps. The gas-liquid mixed transportation pump includes a vortex impeller assembly, a centrifugal impeller, a rotating shaft, and a support assembly; the vortex impeller assembly and the centrifugal impeller are arranged at intervals along the length direction of the rotating shaft, the support assembly is sleeved on the outer wall of the rotating shaft and is respectively installed in corresponding bearing boxes; the suction chamber of the vortex impeller assembly is communicated with the suction port, the discharge chamber of the vortex impeller assembly is communicated with the suction chamber of the centrifugal impeller through a transition pipeline, and the discharge chamber of the centrifugal impeller is communicated with the discharge port. Therefore, the gas-liquid mixed transportation pump of the present application, relying on the innovative design of the vortex impeller assembly and the optimized structure of the transition pipeline, solves the problems of "gas coalescence" and flow channel blockage faced by traditional centrifugal gas-liquid mixed transportation pumps when dealing with gas-liquid two-phase media with a high gas content rate, and significantly improves the transportation capacity and stability of the mixed transportation pump.

Description

Technical Field

[0001] This application relates to the technical field of mixed - flow pumps, and particularly to a gas - liquid mixed - flow pump. Background Art

[0002] In the fields of oil, natural gas, chemical industry, and new energy, etc., the efficient transportation of gas - liquid two - phase media is a key link in the production process. As the mainstream equipment in this field, the traditional centrifugal gas - liquid mixed - flow pump is designed based on the dynamic characteristics of single - phase fluids, and the medium is worked on by the centrifugal force generated by the rotation of the impeller. However, when the gas phase ratio in the transported medium increases, especially when the pump inlet pressure is in a lower working condition (such as close to or lower than atmospheric pressure), the hydrodynamic characteristics of the traditional centrifugal pump deteriorate significantly, resulting in a sharp drop in pump efficiency or even a complete loss of work capacity. This technical bottleneck severely restricts the application of centrifugal gas - liquid mixed - flow pumps in scenarios with low inlet pressure and high gas content such as shale gas extraction, deep - sea oil and gas transportation, and geothermal circulation.

[0003] Existing research shows that the failure mechanism of traditional centrifugal gas - liquid mixed - flow pumps under high - gas - content working conditions mainly stems from the non - uniform phase evolution of gas - liquid two - phase flow in the impeller passage. Specifically, when the gas - phase volume fraction is high and the inlet pressure is insufficient, the gas phase rapidly coalesces at the impeller inlet due to the phase - separation effect of the centrifugal force field, forming discrete large gas masses with scales much larger than the characteristic size of the passage (i.e., the "gas - phase coalescence" phenomenon). Such gas - phase masses occupy the dominant space in the passage. On the one hand, they block the continuous flow of the liquid - phase medium, leading to a sharp drop in the energy transfer efficiency; on the other hand, the elastic compression characteristics of the large gas masses significantly weaken the kinetic - energy transfer of the impeller to the medium, forming the "gas - resistance effect". Summary of the Invention

[0004] The embodiments of this application solve the technical problems proposed in the background art by providing a gas - liquid mixed - flow pump.

[0005] The embodiments of this application provide a gas - liquid mixed - flow pump, which includes a vortex impeller assembly, a centrifugal impeller, a rotating shaft, and a support assembly; the vortex impeller assembly and the centrifugal impeller are arranged at intervals along the length direction of the rotating shaft, the support assembly is sleeved on the outer wall of the rotating shaft and is respectively installed in corresponding bearing boxes; the suction chamber of the vortex impeller assembly is communicated with the suction port, the discharge chamber of the vortex impeller assembly is communicated with the suction chamber of the centrifugal impeller through a transition pipeline, and the discharge chamber of the centrifugal impeller is communicated with the discharge port.

[0006] In a possible implementation manner, the vortex impeller assembly includes a single - stage double - suction vortex impeller or two parallel single - stage single - suction vortex impellers.

[0007] In a possible implementation, the centrifugal impeller includes a cover plate and a plurality of blade assemblies circumferentially and evenly distributed on the end face of the cover plate; each blade assembly includes an inner blade and an outer blade radially spaced apart on the end face of the cover plate; both the inner blade and the outer blade are detachably connected to the end face of the cover plate; the pressure surfaces of the inner blade and the outer blade are arranged in the same direction, and the suction surfaces are arranged in the same direction; the pressure surface of the inner blade and the suction surface of its corresponding outer blade form a diversion transition flow channel.

[0008] In a possible implementation, the pressure surface of the inner blade and the suction surface of its corresponding outer blade have no overlapping area on their axial projection plane; the normal distance from the pressure surface of the inner blade to its suction surface gradually decreases along the medium flow direction; the extension surface of the pressure surface of the inner blade is tangent to the suction surface of the corresponding outer blade to form a continuously transitional flow channel profile.

[0009] In a possible implementation, the pressure surface of the inner blade and the suction surface of its corresponding outer blade form a partial overlapping area on their axial projection plane.

[0010] In a possible implementation, the gas-liquid mixed transportation pump further includes a plurality of angle adjustment mechanisms arranged between the cover plate and the corresponding blade assemblies; the angle adjustment mechanism includes: a first connection hole provided on the inner blade and a second connection hole provided on the outer blade; a first positioning hole group and a second positioning hole group correspondingly provided on the cover plate; a plurality of adjustment screws sequentially passing through the first positioning hole group and the first connection hole, and the second positioning hole group and the second connection hole to realize the fixation of the inner blade and the cover plate, and the outer blade and the cover plate; wherein, the inner blade and the outer blade rotate and adjust within a preset range around the axis of the adjustment screw to synchronously change their installation angles and the width of the diversion transition flow channel between the inner blade and its corresponding outer blade.

[0011] In a possible implementation, a plurality of the adjustment screws extend into the corresponding first positioning hole group and second positioning hole group.

[0012] In a possible implementation, the gas-liquid mixed transportation pump further includes a plurality of exhaust holes; the plurality of exhaust holes are circumferentially and evenly distributed along the cover plate; the edge of each exhaust hole is respectively tangent to the suction surface contour line and the inlet surface contour line of two adjacent inner blades.

[0013] In a possible implementation, the transition pipeline is of a gradually expanding structure, and a bubble-breaking filter screen is arranged inside it, and the bubble-breaking filter screen is close to the centrifugal impeller.

[0014] In a possible implementation, the support assembly includes a first support member and a second support member; both the first support member and the second support member are sleeved on the outer wall of the rotating shaft and are respectively installed in corresponding bearing boxes; the vortex impeller assembly and the centrifugal impeller are both located between the first support member and the second support member; or both the first support member and the second support member are located on the side of the centrifugal impeller away from the vortex impeller assembly.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0016] The gas-liquid mixed transportation pump provided in the embodiments of the present application includes a vortex impeller assembly, a centrifugal impeller, a rotating shaft, and a support assembly. After the mixed transportation pump is started, the gas-liquid two-phase medium enters the suction chamber of the vortex impeller assembly through the suction port. The vortex impeller assembly induces the shear layer instability through the biomimetic blade-shaped groove array uniformly distributed on its outer circumference during rotation, realizing the efficient turbulent mixing and pre-compression of the gas-liquid two-phase medium. Subsequently, the mixed medium smoothly transitions to the suction chamber of the centrifugal impeller through a carefully designed transition pipeline. Inside the centrifugal impeller, the medium is further affected by the centrifugal force to complete deep mixing and pressure increase. Finally, the fully mixed and pressurized gas-liquid two-phase medium is discharged from the discharge chamber of the centrifugal impeller and enters the subsequent process flow.

[0017] The introduction of the vortex impeller assembly in the present application enables the medium to obtain preliminary mixing and pre-compression before entering the centrifugal impeller, thereby significantly improving the mixing uniformity of the medium in the centrifugal impeller and effectively reducing the "gas coalescence" phenomenon. The design of the transition pipeline fully considers the flow characteristics of the gas-liquid two-phase medium to ensure the smooth transition of the medium from the vortex impeller assembly to the centrifugal impeller, avoiding problems such as flow channel blockage and medium separation.

[0018] Aiming at the "gas coalescence" problem that easily occurs in traditional centrifugal gas-liquid mixed transportation pumps when the pump inlet pressure is low, the mixed transportation pump of the present application optimizes the designs of the vortex impeller assembly and the centrifugal impeller to enhance the mixing and transportation capabilities of the medium under low-pressure conditions and effectively avoid the situation of large air masses blocking the flow channel. Therefore, the gas-liquid mixed transportation pump of the present application, with the innovative design of the vortex impeller assembly and the optimized structure of the transition pipeline, solves the "gas coalescence" and flow channel blockage problems faced by traditional centrifugal gas-liquid mixed transportation pumps when dealing with gas-liquid two-phase media with a high gas content rate, and significantly improves the transportation capacity and stability of the mixed transportation pump. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Structural schematic diagram of the gas-liquid mixed transportation pump provided by the embodiment of the present application;

[0021] Figure 2 Structural schematic diagram of an implementation manner of the support assembly provided by the embodiment of the present application;

[0022] Figure 3 Structural schematic diagram of another implementation method of the support assembly provided by the embodiment of the present application;

[0023] Figure 4 Structural schematic diagram of an implementation manner of the centrifugal impeller provided by the embodiment of the present application;

[0024] Figure 5 Structural diagram of the exhaust hole provided by the embodiment of the present application;

[0025] Figure 6 Structural schematic diagram of the angle adjustment mechanism provided by the embodiment of the present application;

[0026] Figure 7 Structural schematic diagram of the transition pipeline provided by the embodiment of the present application;

[0027] Figure 8 Structural schematic diagram of another implementation manner of the centrifugal impeller provided by the embodiment of the present application;

[0028] Figure 9 Structural schematic diagram of adjusting the outer blades through the angle adjustment mechanism provided by the embodiment of the present application;

[0029] Figure 10 Structural schematic diagram of adjusting the inner blades through the angle adjustment mechanism provided by the embodiment of the present application.

[0030] Icon: 1 - Vortex impeller assembly; 2 - Centrifugal impeller; 21 - Cover plate; 22 - Blade assembly; 221 - Inner blade; 222 - Outer blade; 3 - Rotating shaft; 4 - Support assembly; 41 - First support; 42 - Second support; 5 - Suction port; 6 - Discharge port; 7 - Angle adjustment mechanism; 71 - Adjusting screw; 8 - Exhaust hole; 9 - Transition pipeline; 10 - Bubble breaking filter screen. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0032] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0033] The embodiments of the present application provide a gas-liquid mixed transportation pump, as Figures 1 to 10 shown. The gas-liquid mixed transportation pump includes a vortex impeller assembly 1, a centrifugal impeller 2, a rotating shaft 3, and a support assembly 4. The vortex impeller assembly 1 and the centrifugal impeller 2 are arranged at intervals along the length direction of the rotating shaft 3. The support assembly 4 is sleeved on the outer wall of the rotating shaft 3 and is respectively installed in the corresponding bearing boxes.

[0034] The suction chamber of the vortex impeller assembly 1 is communicated with the suction port 5. The discharge chamber of the vortex impeller assembly 1 is communicated with the suction chamber of the centrifugal impeller 2 through a transition pipeline 9. The discharge chamber of the centrifugal impeller 2 is communicated with the discharge port 6.

[0035] Specifically, a bionic blade-shaped groove array is evenly distributed in the outer circumferential direction of the vortex impeller assembly 1. When it rotates in the flow channel, the shear layer instability is induced through periodic flow field disturbance to achieve efficient turbulent mixing of the gas-liquid medium.

[0036] It should be noted that after the mixed transportation pump is started, the gas-liquid two-phase medium enters the suction chamber of the vortex impeller assembly 1 through the suction port 5. The vortex impeller assembly 1 induces the shear layer instability during rotation through the bionic blade-shaped groove array evenly distributed in its outer circumferential direction to achieve efficient turbulent mixing and pre-compression of the gas-liquid two-phase medium. Subsequently, the mixed medium smoothly transitions to the suction chamber of the centrifugal impeller 2 through the carefully designed transition pipeline 9. Inside the centrifugal impeller 2, the medium is further affected by the centrifugal force to complete deep mixing and pressure increase. Finally, the fully mixed and pressurized gas-liquid two-phase medium is discharged from the discharge chamber of the centrifugal impeller 2 and enters the subsequent technological process.

[0037] The introduction of the vortex impeller assembly 1 in this application enables the medium to obtain preliminary mixing and pre-compression before entering the centrifugal impeller 2, thereby significantly improving the mixing uniformity of the medium in the centrifugal impeller 2 and effectively reducing the "gas coalescence" phenomenon. The design of the transition pipeline 9 fully considers the flow characteristics of the gas-liquid two-phase medium to ensure a smooth transition of the medium from the vortex impeller assembly 1 to the centrifugal impeller 2, avoiding problems such as flow channel blockage and medium separation.

[0038] Aiming at the "gas coalescence" problem that easily occurs in traditional centrifugal gas-liquid mixed transportation pumps when the pump inlet pressure is low, the mixed transportation pump of this application optimizes the design of the vortex impeller assembly 1 and the centrifugal impeller 2 to enhance the mixing and transportation ability of the medium under low-pressure conditions, effectively avoiding the situation of large air masses blocking the flow channel. Therefore, the gas-liquid mixed transportation pump of this application, with the innovative design of the vortex impeller assembly 1 and the optimized structure of the transition pipeline 9, solves the "gas coalescence" and flow channel blockage problems faced by traditional centrifugal gas-liquid mixed transportation pumps when dealing with gas-liquid two-phase media with a high gas content, significantly improving the transportation ability and stability of the mixed transportation pump.

[0039] Furthermore, for special working conditions with a low gas content but a high head requirement, the series connection order of the centrifugal impeller 2 and the vortex impeller assembly 1 can be reversed to form a composite structure of "vortex impeller assembly 1 + centrifugal impeller 2". At this time, the vortex impeller assembly 1 can be set as single-stage or multi-stage series connection according to the system head requirement:

[0040] When the medium flow rate is large, two or more vortex impeller assemblies 1 are arranged in parallel, and the single-channel load is reduced by shunting to avoid vortex cavitation;

[0041] When the head requirement is large, multi-stage single-suction vortex impellers are connected in series to achieve ultra-high pressure output through the superposition of pressure gradients.

[0042] Since the closed-channel structure of the vortex impeller assembly 1 can increase the single-stage head by 3 - 5 times compared with the centrifugal impeller 2, compared with traditional multi-stage centrifugal mixed transportation pumps, the number of impeller stages can be greatly reduced, shortening the axial dimension of the mixed transportation pump and reducing the cost.

[0043] In the embodiment of this application, the vortex impeller assembly 1 includes a single-stage double-suction vortex impeller or two parallel single-stage single-suction vortex impellers. Given the low flow rate characteristic of the vortex impeller, by adopting the single-stage double-suction vortex impeller design or the parallel connection of two single-stage single-suction vortex impellers, the transportation flow rate of the vortex impeller assembly 1 can be increased to 1.8 - 2.0 times that of the single-suction structure.

[0044] Specifically, the suction chamber of the vortex impeller assembly 1 is a semi-helical structure, aiming to reduce the inlet flow loss and effectively reduce the possibility of separation of the gas-liquid mixed medium.

[0045] In the embodiments of the present application, the centrifugal impeller 2 includes a cover plate 21 and a plurality of blade assemblies 22 circumferentially and uniformly distributed on the end face of the cover plate 21. The blade assembly 22 includes an inner blade 221 and an outer blade 222 that are radially spaced apart on the end face of the cover plate 21. The inner blade 221 and the outer blade 222 are detachably connected to the end face of the cover plate 21. The pressure surfaces of the inner blade 221 and the outer blade 222 are arranged in the same direction, and the suction surfaces are arranged in the same direction. The pressure surface of the inner blade 221 and the suction surface of its corresponding outer blade 222 form a diversion transition flow channel.

[0046] It should be noted that a unique diversion transition flow channel is formed between the pressure surface of the inner blade 221 and the suction surface of the corresponding outer blade 222. This design realizes the secondary rectification of the gas-liquid two-phase flow through a double streamline cooperative control mechanism. Specifically, the diversion transition flow channel cleverly promotes the stratified flow of the gas between the inner and outer blades 222, effectively avoiding the coalescence of bubbles and the formation of gas plugs. In addition, since both the inner blade 221 and the outer blade 222 are detachably connected to the end face of the cover plate 21, this brings great convenience in practical applications. When a certain blade assembly 22 is damaged due to wear, corrosion or other reasons, or needs to be regularly maintained, the staff can easily detach and replace the blade assembly 22 alone without disassembling and replacing the entire impeller. This design not only reduces the maintenance cost, but also significantly improves the reliability and operating efficiency of the equipment.

[0047] Under normal operating conditions (gas volume fraction ≥ 25%), there is no overlapping area between the pressure surface of the inner blade 221 and the suction surface of its corresponding outer blade 222 on their axial projection planes. The normal distance from the pressure surface of the inner blade 221 to its suction surface gradually decreases along the medium flow direction, that is, a "thinning" design is carried out at the outlet of the pressure surface of the inner blade 221, forming a structure similar to a "nozzle". This design not only increases the flow velocity of the medium, but also significantly enhances the impact kinetic energy on the gas accumulation area of the suction surface of the outer blade 222, making the guiding effect more significant. The extension surface of the pressure surface of the inner blade 221 is tangent to the suction surface of the corresponding outer blade 222 to ensure the smoothness of the flow channel transition.

[0048] As Figure 8 shown, the inner blade 221 and the outer blade 222 adopt a clever staggered arrangement. This layout design not only significantly increases the flow area at the break of the inner blade 221 and the outer blade 222, thus effectively improving the gas flow capacity; but also makes the gas mainly concentrate on the suction surfaces of the inner blade 221 and the outer blade 222 in the middle of the flow channel of the centrifugal impeller 2, optimizing the gas flow path.

[0049] In this application, a tangency design is adopted between the extension surface of the pressure side of the inner blade 221 and the suction side of the outer blade 222. This design ingeniously guides the high-speed medium at the outlet of the inner blade 221 to the suction side of the outer blade 222, generating a strong impact on the gas gathered here. This impact not only effectively breaks up the gas inside the centrifugal impeller 2 but also promotes the mixing and uniform distribution of the gas.

[0050] Meanwhile, the staggered arrangement of the inner blade 221 and the outer blade 222 further intensifies the flow turbulent kinetic energy at the fracture. The increase in this turbulent kinetic energy not only benefits the mixing of the gas in the middle of the centrifugal impeller 2 but also improves the gas flow efficiency and energy conversion efficiency.

[0051] In summary, the staggered arrangement of the inner blade 221 and the outer blade 222 not only optimizes the gas flow path and enhances the gas circulation capacity but also effectively breaks up the gas inside the centrifugal impeller 2 through the ingenious diversion design and the increased flow turbulent kinetic energy, promotes the mixing and uniform distribution of the gas, and improves the performance and efficiency of the centrifugal impeller.

[0052] In the embodiment of this application, the gas-liquid mixed transportation pump further includes a plurality of angle adjustment mechanisms 7 arranged between the cover plate 21 and the corresponding blade assembly 22. The angle adjustment mechanism 7 includes: a first connection hole provided on the inner blade 221 and a second connection hole provided on the outer blade 222. A first positioning hole group and a second positioning hole group correspondingly provided on the cover plate 21. A plurality of adjustment screws 71 sequentially pass through the first positioning hole group and the first connection hole, and the second positioning hole group and the second connection hole to realize the fixation of the inner blade 221 and the cover plate 21, and the outer blade 222 and the cover plate 21. Among them, the inner blade 221 and the outer blade 222 rotate and adjust within a preset range around the axis of the adjustment screw 71 to synchronously change their installation angles and the widths of the diversion transition channels of the inner blade 221 and the corresponding outer blade 222.

[0053] It should be noted that as Figure 9 shown, by making a counterclockwise adjustment with the axis of the adjustment screw 71 as the rotation center, the installation angle of the outer blade 222 will increase accordingly. This adjustment enhances the work capacity of the centrifugal impeller 2, and the generated head also increases accordingly, so as to ensure that the centrifugal impeller 2 can still maintain a strong work capacity under high gas content conditions.

[0054] In addition, as Figure 10As shown, the rotation adjustment of the inner blade 221 positions it between two adjacent outer blades 222. The inner blade 221 serves to divert the medium between these two outer blades 222, while the two outer blades 222 exert a constraining effect on the medium. Such a design avoids more diffusion losses, effectively suppresses gas-phase separation, that is, reduces the possibility of separation between the gas-liquid two-phase, thereby reducing the risk of sudden drop in head caused by gas-phase separation.

[0055] Under special working conditions (gas volume fraction ≤ 15%), by adjusting the angle adjustment mechanism 7 to adjust the installation angle of the outer blade 222, a local overlapping area is formed between the pressure surface of the inner blade 221 and the suction surface of its corresponding outer blade 222 on their axial projection planes to enhance the gas-liquid mixing intensity.

[0056] In the embodiment of the present application, a plurality of adjusting screws 71 extend into the corresponding first positioning hole group and second positioning hole group. This not only ensures the stability and working reliability of the pump body structure, but also effectively avoids the influence of the adjustment process on the normal operation of the centrifugal impeller 2, providing strong support for the performance optimization of the mixed-flow pump.

[0057] In the embodiment of the present application, as Figure 4 shown, the gas-liquid mixed-flow pump further includes a plurality of exhaust holes 8. The plurality of exhaust holes 8 are evenly distributed along the circumference of the cover plate 21. The edge of each exhaust hole 8 is respectively tangent to the suction surface contour line and the inlet surface contour line of two adjacent inner blades 221. The exhaust holes 8 of the present application penetrate the entire inlet flow passage, effectively avoiding the gas blockage problem at the inlet of the centrifugal impeller 2.

[0058] In the embodiment of the present application, the suction chamber of the centrifugal impeller 2 is a semi-spiral structure. When the gas-liquid mixed medium pressurized by the vortex impeller assembly 1 enters the centrifugal impeller 2, under the dominant action of pressure energy, the gas solubility increases significantly. At the same time, the forced swirling effect generated by the semi-spiral structure further suppresses the gas-liquid two-phase separation, enabling the medium to flow uniformly within the centrifugal impeller 2.

[0059] In the embodiment of the present application, the transition pipeline 9 is of a gradually expanding structure, and a bubble-breaking filter screen 10 is arranged inside it, and the bubble-breaking filter screen 10 is close to the centrifugal impeller 2.

[0060] It should be noted that the transition pipe 9 between the vortex impeller assembly 1 and the centrifugal impeller 2 adopts a gradually expanding structure. This design aims to avoid a large secondary separation phenomenon of the gas-liquid mixed medium in the flow channel, so as to ensure that the medium can transition to the centrifugal impeller 2 smoothly and efficiently. At the position near the outlet of the transition pipe 9 (i.e., the inlet of the centrifugal impeller 2), a bubble-breaking filter screen 10 is added in this application. Since the medium already has a large pressure energy after doing work through the front vortex impeller assembly 1, it can easily pass through the bubble-breaking filter screen 10. The main function of this bubble-breaking filter screen 10 is to secondarily break the bubbles that may be separated and aggregated in the transition pipe 9 to ensure that the inlet of the centrifugal impeller 2 is a gas-liquid two-phase medium with uniform mixing. In this way, the mixed transportation capacity of the centrifugal impeller 2 can be further improved, and it shows more excellent performance when dealing with gas-liquid mixed media.

[0061] In the embodiment of this application, both the first support member 41 and the second support member 42 are sleeved on the outer wall of the rotating shaft 3 and are respectively installed in the corresponding bearing boxes. Both the vortex impeller assembly 1 and the centrifugal impeller 2 are located between the first support member 41 and the second support member 42, forming a two-end support structure. This structure can effectively resist the radial and axial forces generated during rotation and ensure the smooth operation of the rotating shaft 3.

[0062] This application is not limited to the above structure. In another layout, both the first support member 41 and the second support member 42 are located on the other side of the centrifugal impeller 2 relative to the vortex impeller assembly 1, that is, they jointly support one end of the centrifugal impeller 2 far from the vortex impeller assembly 1, forming a cantilever support structure. The cantilever support structure locates both the first support member 41 and the second support member 42 on the other side of the centrifugal impeller 2 relative to the vortex impeller assembly 1, making the whole structure more compact.

[0063] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0064] The above embodiments are only used to illustrate the technical solutions of this application, rather than limiting this application; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of this application.

Claims

1. A gas-liquid mixed delivery pump, characterized in that: It comprises a vortex impeller assembly (1), a centrifugal impeller (2), a rotating shaft (3) and a supporting assembly (4); The vortex impeller assembly (1) and the centrifugal impeller (2) are arranged at intervals along the length direction of the rotating shaft (3); the support assembly (4) is sleeved on the outer wall of the rotating shaft (3) and is respectively installed in the corresponding bearing box; The suction chamber of the vortex impeller assembly (1) is connected to the suction port (5), the discharge chamber of the vortex impeller assembly (1) is connected to the suction chamber of the centrifugal impeller (2) through a transition duct (9), and the discharge chamber of the centrifugal impeller (2) is connected to the discharge port (6); The centrifugal impeller (2) comprises a cover plate (21) and a plurality of blade assemblies (22) uniformly distributed on the end surface of the cover plate (21) along the circumferential direction; The blade assembly (22) comprises inner blades (221) and outer blades (222) which are radially spaced apart and arranged along the end surface of the cover plate (21); the inner blades (221) and the outer blades (222) are both detachably connected to the end surface of the cover plate (21); the pressure surfaces of the inner blades (221) and the outer blades (222) are arranged in the same direction, and the suction surfaces are arranged in the same direction; the pressure surface of the inner blade (221) and the corresponding suction surface of the outer blade (222) form a split flow transition channel; The pressure surface of the inner blade (221) and the suction surface of the corresponding outer blade (222) have no overlapping area on their axial projection surfaces; The normal distance from the pressure surface of the inner blade (221) to its suction surface gradually decreases along the flow direction of the medium; The extended surface of the pressure surface of the inner blade (221) is tangent to the suction surface of the corresponding outer blade (222) to form a continuous transitional flow channel profile; It also includes a plurality of angle adjustment mechanisms (7) arranged between the cover plate (21) and the corresponding blade assemblies (22); The angle adjustment mechanism (7) comprises: A first connection hole provided on the inner blade (221) and a second connection hole provided on the outer blade (222); A first positioning hole group and a second positioning hole group are correspondingly arranged on the cover plate (21); A plurality of adjustment screws (71) are passed through the first positioning hole group and the first connecting hole, and the second positioning hole group and the second connecting hole in sequence, so as to achieve the fixing of the inner blade (221) and the cover plate (21), and the fixing of the outer blade (222) and the cover plate (21); The inner blade (221) and the outer blade (222) are rotatably adjusted within a preset range around the axis of the adjustment screw (71) to synchronously change their placement angles and the widths of the flow splitting transition channels of the inner blade (221) and the corresponding outer blade (222).

2. The gas-liquid mixed transfer pump according to claim 1, characterized in that: The vortex impeller assembly (1) comprises a single-stage double-suction vortex impeller or two parallel-connected single-stage single-suction vortex impellers.

3. The gas-liquid mixed transfer pump according to claim 1, characterized in that: The pressure surface of the inner blade (221) and the suction surface of the corresponding outer blade (222) form a local overlapping area on their axial projection surfaces.

4. The gas-liquid mixed transfer pump according to claim 1, characterized in that: The plurality of adjusting screws (71) extend into the corresponding first positioning hole group and second positioning hole group.

5. The gas-liquid mixed transfer pump according to claim 1, characterized in that: Also includes a plurality of exhaust holes (8); The plurality of exhaust holes (8) are evenly distributed along the circumference of the cover plate (21); The edge of each exhaust hole (8) is tangent to the suction surface contour line and the inlet surface contour line of two adjacent inner blades (221) respectively.

6. The gas-liquid mixed transfer pump according to claim 1, characterized in that: The transition duct (9) is of a gradually expanding structure and is provided with a bubble breaking filter (10) inside, wherein the bubble breaking filter (10) is close to the centrifugal impeller (2).

7. The gas-liquid mixed transfer pump according to claim 1, characterized in that: The support assembly (4) comprises a first support member (41) and a second support member (42); The first support member (41) and the second support member (42) are both sleeved on the outer wall of the rotating shaft (3), and are respectively installed in corresponding bearing boxes; The vortex impeller assembly (1) and the centrifugal impeller (2) are both located between the first support member (41) and the second support member (42); Alternatively, the first support member (41) and the second support member (42) are both located on a side of the centrifugal impeller (2) facing away from the vortex impeller assembly (1).

Images