An efficient spiral axial-flow gas treatment pump

Abstract

The present invention discloses an efficient spiral axial-flow gas treatment pump, belonging to the technical field of axial-flow mixed transportation pumps. It includes a mounting frame and a pump body installed on the mounting frame. A motor is fixed on the mounting frame, and the pump body is connected to the motor through a main shaft. At least two impellers are assembled on the main shaft, and a rectifier is assembled between the two impellers; through the arranged impellers, rectifier and space adjustment unit, when the crude oil and associated gas advance spirally under the action of the moving blades, part of the crude oil and associated gas enter the front acceleration channel through the liquid inlet to be accelerated, and impact the crude oil and associated gas in the pump body through the liquid outlet, breaking the air bags, promoting gas-liquid mixing and reducing the gas-phase aggregation area. At the same time, after passing through the rectifier and cooperating with the impeller, the medium can move axially, further preventing gas-liquid separation. And when the fluid contacts the surface of the stationary blade, part of it will enter the flow channel for circulation to impact the fluid flowing between two adjacent stationary blades, further reducing the situation of gas-liquid separation.

Description

Technical Field

[0001] The present invention relates to the technical field of axial-flow mixed-flow pumps, and particularly to an efficient helical axial-flow gas treatment pump. Background Art

[0002] The products of offshore oil fields are multiphase mixtures containing oil, gas, water and various impurities, and their gas-liquid ratio exceeds the normal operating range of ordinary pumps or compressors. The helical axial-flow mixed-flow pump can directly transport multiphase media, and its direct transportation method simplifies the production process of chemical enterprises and reduces infrastructure costs.

[0003] The working principle of the helical axial-flow mixed-flow pump is as follows: the multiphase medium to be transported obtains energy through the rotation of the impeller. It consists of several compression units, and each compression unit includes an impeller and a rectifier. When the transported medium enters the impeller, due to the rotation of the impeller, the medium is accelerated to obtain kinetic energy. When the accelerated medium passes through the rectifier, the speed decreases and the kinetic energy is converted into pressure energy. Each time the medium passes through a unit stage, a part of energy is increased.

[0004] Axial-flow mixed-flow pumps are manufactured with reference to the principles of single-phase pumps and compressors, and can transport both single-phase flows and multiphase flows. When transporting multiphase flows, complex phenomena such as the aggregation and separation of bubbles and the separation and mixing of phases often occur in the mixed-flow pump, which easily leads to phenomena such as flow separation and local gas blockage, and thus it is impossible to ensure the efficient and stable operation of the pump. Summary of the Invention

[0005] The purpose of the present invention is to propose an efficient helical axial-flow gas treatment pump to solve the problem that when an axial-flow mixed-flow pump transports multiphase flows, complex phenomena such as the aggregation and separation of bubbles and the separation and mixing of phases often occur in the mixed-flow pump, which easily leads to phenomena such as flow separation and local gas blockage, and thus it is impossible to ensure the efficient and stable operation of the pump.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An efficient helical axial-flow gas treatment pump includes a mounting frame and a pump body mounted on the mounting frame. A motor is fixed on the mounting frame, the pump body is connected to the motor through a main shaft, at least two impellers are assembled on the main shaft, and a rectifier is assembled between the two impellers;

[0008] The impeller includes a frustum-shaped hub assembled on the main shaft, multiple moving blades are provided on the frustum-shaped hub, and a front acceleration channel is provided in the moving blade;

[0009] Driven by the motor, the main shaft drives the moving blades spirally distributed on the conical hub to rotate and do work, enabling the crude oil and associated gas entering the pump body to obtain kinetic energy. At the same time, part of the crude oil and associated gas enters the front acceleration channel through the inlet for accelerated circulation, and impacts the crude oil and associated gas in the pump body through the outlet, promoting gas-liquid mixing and reducing gas phase aggregation.

[0010] As a further description of the above technical solution:

[0011] The pump body includes a pump casing. The main shaft is rotatably connected inside the pump casing, and two connecting flanges are fixedly communicated with the pump casing.

[0012] As a further description of the above technical solution:

[0013] A liquid inlet communicating with the front acceleration channel is provided on one side of the moving blade, a liquid outlet communicating with the front acceleration channel is provided on the other side of the moving blade, and a defoaming unit is provided on the inner wall of the front acceleration channel.

[0014] As a further description of the above technical solution:

[0015] The defoaming unit includes a front inclined thorn rod fixed on the inner wall at the inlet of the front acceleration channel and a rear inclined thorn rod fixed on the inner wall at the outlet of the front acceleration channel. A cross thorn rod is fixed in the middle of the inner cavity of the front acceleration channel. The front inclined thorn rod, the rear inclined thorn rod and the cross thorn rod are all sheet-shaped and have smooth surfaces.

[0016] As a further description of the above technical solution:

[0017] The rectifier includes a cylindrical hub, on which at least nine stationary blades are fixed. Two flow channels are provided in the stationary blades, and two inlet / outlet slots communicating with the two flow channels are respectively provided on both sides of the stationary blades.

[0018] As a further description of the above technical solution:

[0019] A space adjustment unit is assembled on one side wall of the pump casing;

[0020] The space adjustment unit includes a piston seat sleeved on the main shaft. A guiding inclined surface is formed on one side of the piston seat close to the conical hub. The piston seat is slidably connected to the pump casing through a slider, enabling the piston seat to slide along the main shaft.

[0021] As a further description of the above technical solution:

[0022] A pressure groove is provided on the side of the piston seat away from the conical hub. Buffer pads are fixed on the inner wall of the pressure groove and one side wall of the pump casing, and an elastic member is fixedly connected between the two buffer pads.

[0023] As a further description of the above technical solution:

[0024] There are two symmetric rear acceleration channels provided in the piston seat. An inlet groove communicating with the inlet of the rear acceleration channel is opened at the bottom of the guiding inclined surface, and an outlet groove communicating with the outlet of the rear acceleration channel is opened at the top of the guiding inclined surface.

[0025] To sum up, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0026] By providing the impeller, the rectifier and the space adjustment unit, when the frustum-shaped hub drives the moving blades to rotate following the main shaft, the crude oil and associated gas entering the pump body can obtain kinetic energy, and under the action of the stationary blades on the cylindrical hub, the energy conversion is completed, the velocity circulation of the crude oil and associated gas is transformed, and the kinetic energy is converted into pressure energy;

[0027] When the crude oil and associated gas advance spirally under the action of the moving blades, part of the crude oil and associated gas enters the front acceleration channel through the liquid inlet for acceleration during the process, and impacts the crude oil and associated gas in the pump body through the liquid outlet, which can break the airbag, promote gas-liquid mixing and reduce the gas-phase aggregation area. At the same time, after passing through the rectifier and cooperating with the impeller, the medium can move axially, further preventing gas-liquid separation. At the same time, the design of the stationary blades can effectively slow down the erosion of the inner wall of the pump shell by the fluid, and when the fluid contacts the surface of the stationary blades, part of it will enter the flow channel for circulation to impact the fluid flowing between two stationary blades, further reducing the situation of gas-liquid separation;

[0028] At the same time, when the flow rate is in the normal state, the pressure generated by the fluid during axial flow can drive the elastic member to compress, and then the vertical surface of the piston seat is in contact with the inner wall of the pump shell. In this state, the outlet on the pump shell is completely opened, and the fluid can quickly pass through after normal pressurization. When the flow rate is small, the pressure of the fluid on the piston seat cannot continue to drive the elastic member to compress. At this time, the piston seat moves towards the impeller side, compressing the space at the outlet end of the pump shell and reducing the outlet at the same time. At this time, even when the flow rate is small, the fluid can flow quickly. In both states, the guiding inclined surface can guide the fluid to the outlet. At the same time, during the guiding process, part of the fluid will enter the rear acceleration channel for acceleration and rush out from the outlet groove to the pump shell outlet to impact the fluid flowing into the pump shell outlet, further reducing the situation of gas-liquid separation, etc.;

[0029] With the combined use of these components, the separation of gas-liquid flow and local gas blockage are effectively prevented, ensuring the efficient and stable operation of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shows a three-dimensional structural schematic diagram provided according to an embodiment of the present invention;

[0031] Figure 2 It shows a schematic structural diagram of the interior of a pump casing cut open from a first perspective according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the structure of the interior of a pump casing cut open from a second perspective according to an embodiment of the present invention is shown;

[0033] Figure 4 A schematic diagram of the structure of a main shaft provided in an embodiment of the present invention is shown;

[0034] Figure 5 A schematic structural diagram of an impeller from a first viewing angle provided by an embodiment of the present invention is shown;

[0035] Figure 6 A schematic diagram of the structure of an impeller according to a second viewing angle provided by an embodiment of the present invention is shown;

[0036] Figure 7 A schematic diagram of the planar structure of a moving blade provided according to an embodiment of the present invention is shown;

[0037] Figure 8 It shows a schematic diagram of the structure of a piston seat cut away according to an embodiment of the present invention;

[0038] Figure 9 The embodiment of the present invention provides Figure 4 Schematic diagram of the structure enlarged at point A in the middle.

[0039] Legend:

[0040] 10. Mounting frame;

[0041] 20. Pump body; 21. Pump casing; 22. Connecting flange; 23. Main shaft;

[0042] 30. Motor;

[0043] 40. impeller; 41. truncated cone hub; 42. moving blades; 43. front acceleration channel; 44. liquid inlet; 45. liquid outlet; 46. defoaming unit; 461. front oblique thorn rod; 462. rear oblique thorn rod; 463. cross thorn rod;

[0044] 50. rectifier; 51. cylindrical hub; 52. stationary blade; 53. flow slot; 54. inlet and outlet slot;

[0045] 60. Space adjustment unit; 61. Piston seat; 62. Guide slope; 63. Pressure groove; 64. Buffer pad; 65. Elastic member; 66. Rear acceleration channel; 67. Inlet groove; 68. Outlet groove. DETAILED DESCRIPTION

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] As Figure 1 - Figure 9 shown, the present invention provides:

[0048] An efficient spiral axial-flow gas treatment pump, including a mounting frame 10 and a pump body 20 mounted on the mounting frame 10. A motor 30 is fixed on the mounting frame 10. The pump body 20 is connected to the motor 30 through a main shaft 23. At least two impellers 40 are assembled on the main shaft 23, and a rectifier 50 is assembled between the two impellers 40;

[0049] The pump body 20 includes a pump casing 21. The main shaft 23 is rotatably connected inside the pump casing 21. Two connecting flanges 22 are fixedly connected to the pump casing 21. A space adjusting unit 60 is assembled on one side wall of the pump casing 21.

[0050] As Figure 2 , Figure 3 , Figure 5 and Figure 6 shown, the impeller 40 includes a frustum-shaped hub 41 assembled on the main shaft 23. A plurality of moving blades 42 are provided on the frustum-shaped hub 41, and a front acceleration channel 43 is provided inside the moving blade 42;

[0051] Driven by the motor 30, the main shaft 23 drives the moving blades 42 spirally distributed on the frustum-shaped hub 41 to rotate and do work, so that the crude oil and associated gas entering the pump body 20 obtain kinetic energy. At the same time, part of the crude oil and associated gas enters the front acceleration channel 43 through the liquid inlet 44 to accelerate the flow, and impacts the crude oil and associated gas in the pump body 20 through the liquid outlet 45, promoting gas-liquid mixing and reducing gas phase aggregation.

[0052] As Figure 5 , Figure 6 and Figure 7 shown, a liquid inlet 44 communicating with the front acceleration channel 43 is opened on one side of the moving blade 42, and a liquid outlet 45 communicating with the front acceleration channel 43 is opened on the other side of the moving blade 42. A defoaming unit 46 is provided on the inner wall of the front acceleration channel 43;

[0053] The defoaming unit 46 includes a front inclined thorn rod 461 fixed on the inner wall at the inlet of the front acceleration channel 43 and a rear inclined thorn rod 462 fixed on the inner wall at the outlet of the front acceleration channel 43. A cross thorn rod 463 is fixed in the middle of the inner cavity of the front acceleration channel 43. The front inclined thorn rod 461, the rear inclined thorn rod 462 and the cross thorn rod 463 are all sheet-shaped and have a smooth surface;

[0054] Specifically, when part of the crude oil and associated gas enter the front acceleration channel 43 through the liquid inlet 44, they will first come into contact with the front inclined thorn rod 461. The front inclined thorn rod 461 can puncture the airbag formed in the incoming fluid. Then the fluid will come into contact with the cross thorn rod 463 and the rear inclined thorn rod 462. The cross thorn rod 463 and the rear inclined thorn rod 462 can puncture the airbag generated during the continuous acceleration of the fluid in the channel. At the same time, since the inner cavity of the front acceleration channel 43 gradually decreases, while driving the fluid to accelerate, it will also squeeze the attached airbag, causing the airbag to burst.

[0055] Such as Figure 2 、 Figure 3 、 Figure 4 and Figure 9 As shown, the rectifier 50 includes a cylindrical hub 51. At least nine stator vanes 52 are fixed on the cylindrical hub 51. Two flow channels 53 are provided in the stator vanes 52. Two inlet and outlet channels 54 communicating with the two flow channels 53 are respectively formed on both sides of the stator vanes 52.

[0056] Preferably, the stator vanes 52 are in a "wavy" shape. The inner cavity sizes of the two flow channels 53 are the same, and the inner diameters of the flow channels 53 are the same from the inlet to the outlet.

[0057] Specifically, when the helically advancing fluid contacts the stator vanes 52, the kinetic energy of the fluid is converted into pressure energy. At the same time, part of the fluid will enter the flow channels 53 during the process. The fluid is re-injected into the fluid between two adjacent stator vanes 52 through the inlet and outlet channels 54 at the tail of the flow channels 53 to promote gas-liquid mixing and reduce gas-liquid flow separation.

[0058] Such as Figure 2 、 Figure 3 、 Figure 4 and Figure 8 As shown, the space adjustment unit 60 includes a piston seat 61 sleeved on the main shaft 23. A guiding inclined surface 62 is formed on one side of the piston seat 61 close to the conical hub 41. The piston seat 61 is slidably connected to the pump housing 21 through a slider, enabling the piston seat 61 to slide along the main shaft 23.

[0059] Chute grooves adapted to the sliders are respectively formed on both side walls of the pump housing 21 close to the piston seat 61, enabling the piston seat 61 to slide in the pump housing 21 along the main shaft 23. At the same time, since the piston seat 61 is sleeved on the main shaft 23, it will not rotate along with the rotation of the main shaft 23, and a sealed state is always maintained between the outer wall of the piston seat 61 and the pump housing 21.

[0060] A pressure groove 63 is formed on one side of the piston seat 61 far from the conical hub 41. Buffer pads 64 are respectively fixed on the inner wall of the pressure groove 63 and one side wall of the pump housing 21. An elastic member 65 is fixedly connected to the two buffer pads 64 together.

[0061] There are two symmetric post-acceleration channels 66 inside the piston seat 61. An inlet groove 67 communicating with the inlet of the post-acceleration channel 66 is opened at the bottom of the guiding inclined surface 62. The inlet groove 67 is in a conical shape with a larger outer diameter and a smaller inner diameter, enabling external fluid to easily enter the post-acceleration channel 66 through the inlet groove 67. An outlet groove 68 communicating with the outlet of the post-acceleration channel 66 is opened at the top of the guiding inclined surface 62. The outlet groove 68 is in a conical shape with a larger inner diameter and a smaller outer diameter, making it difficult for external fluid to enter the post-acceleration channel 66 through the outlet groove 68.

[0062] Specifically, when this high-efficiency spiral axial-flow gas treatment pump is in operation / use:

[0063] First, start the motor 30 to rotate the main shaft 23, thereby driving the impeller 40 and the rectifier 50 to rotate. The crude oil and associated gas entering the pump casing 21 through the connecting flange 22 far from the space adjustment unit 60 advance in a spiral axial-flow manner, and obtain kinetic energy under the action of the front moving blades 42 and flow rapidly. During this process, part of the crude oil and associated gas enters the pre-acceleration channel 43 through the liquid inlet 44, gradually accelerates, and flows out through the liquid outlet 45, impacting the crude oil and associated gas in the pump casing 21, thereby being able to break the airbag, promoting gas-liquid mixing and reducing the gas-phase aggregation area;

[0064] As the fluid continues to flow, it passes through the rectifier 50, and under the action of the stationary blades 52, the kinetic energy of the fluid is converted into pressure energy. At the same time, part of the fluid will enter the flow-through groove 53 during the process, and the fluid is re-injected into the fluid between two adjacent stationary blades 52 through the inlet-outlet groove 54 at the tail of the flow-through groove 53 to promote gas-liquid mixing and further reduce the separation of gas-liquid flow;

[0065] Finally, the fluid flows out to the next stage through the connecting flange 22 close to the space adjustment unit 60. During the outflow process, when the flow rate is in a normal state, the pressure exerted by the fluid on the piston seat 61 can drive the elastic member 65 to compress, and then the piston seat 61 is in a state where its vertical surface is in contact with the inner wall of the pump casing 21. In this state, the outlet on the pump casing 21 is completely opened, and the fluid can quickly pass through after normal pressurization;

[0066] When the flow rate is small, the pressure of the fluid on the piston seat 61 cannot continue to drive the elastic member 65 to compress. At this time, the piston seat 61 moves towards the impeller 40 side, compressing the space at the outlet end of the pump casing 21 and reducing the outlet at the same time. In this way, even when the flow rate is small, the fluid can still flow rapidly. In both states, the guiding inclined surface 62 can guide the fluid to the outlet. At the same time, during the guiding process, part of the fluid will enter the post-acceleration channel 66 to accelerate and rush out from the outlet groove 68 to the outlet of the pump casing 21, impacting the fluid flowing into the outlet of the pump casing 21 and further reducing the situation of gas-liquid separation, etc.

[0067] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An efficient spiral axial-flow gas treatment pump, comprising a mounting frame (10) and a pump body (20) mounted on the mounting frame (10), a motor (30) is fixed on the mounting frame (10), and the pump body (20) is connected to the motor (30) through a main shaft (23), characterized in that, At least two impellers (40) are assembled on the main shaft (23), and a rectifier (50) is assembled between the two impellers (40); The impeller (40) includes a frustum hub (41) assembled on the main shaft (23). A plurality of moving blades (42) are provided on the frustum hub (41), and a front acceleration channel (43) is provided in the moving blade (42); Driven by the motor (30), the main shaft (23) drives the moving blades (42) spirally distributed on the frustum hub (41) to rotate and do work, so that the crude oil and associated gas entering the pump body (20) obtain kinetic energy. At the same time, part of the crude oil and associated gas enter the front acceleration channel (43) through the inlet to accelerate the flow, and impact the crude oil and associated gas in the pump body (20) through the outlet, promoting gas-liquid mixing and reducing gas phase aggregation; A liquid inlet (44) communicating with the front acceleration channel (43) is formed on one side of the moving blade (42), and a liquid outlet (45) communicating with the front acceleration channel (43) is formed on the other side of the moving blade (42). A defoaming unit (46) is provided on the inner wall of the front acceleration channel (43); The defoaming unit (46) includes a front inclined thorn rod (461) fixed to the inner wall at the inlet of the front acceleration channel (43) and a rear inclined thorn rod (462) fixed to the inner wall at the outlet of the front acceleration channel (43). A cross thorn rod (463) is fixed in the middle of the inner cavity of the front acceleration channel (43); The rectifier (50) includes a cylindrical hub (51). At least nine stationary blades (52) are fixed on the cylindrical hub (51). Two flow channels (53) are provided in the stationary blade (52). Two inlet and outlet channels (54) communicating with the two flow channels (53) are respectively formed on both sides of the stationary blade (52).

2. The high-efficiency spiral axial-flow gas treatment pump according to claim 1, characterized in that, The pump body (20) includes a pump casing (21). The main shaft (23) is rotatably connected in the pump casing (21), and two connecting flanges (22) are fixedly connected to the pump casing (21).

3. An efficient helical axial gas treatment pump according to claim 1, characterized in that, The front inclined thorn rod (461), the rear inclined thorn rod (462) and the cross thorn rod (463) are all sheet-shaped and have smooth surfaces.

4. An efficient helical axial-flow gas treatment pump according to claim 2, characterized in that, A space adjusting unit (60) is assembled on one side wall of the pump casing (21); The space adjusting unit (60) includes a piston seat (61) sleeved on the main shaft (23). A guiding inclined surface (62) is formed on one side of the piston seat (61) close to the frustum hub (41). The piston seat (61) is slidably connected to the inside of the pump casing (21) through a slider, so that the piston seat (61) can slide along the main shaft (23).

5. An efficient helical axial flow gas treatment pump according to claim 4, characterized in that, A pressure groove (63) is formed on the side of the piston seat (61) away from the frustum hub (41). Buffer pads (64) are fixed to the inner wall of the pressure groove (63) and one side wall of the pump casing (21). An elastic member (65) is fixedly connected to the two buffer pads (64).

6. An efficient spiral axial flow gas treatment pump according to claim 4, characterized in that, Two symmetrical post-acceleration channels (66) are provided in the piston seat (61). An inlet groove (67) communicating with the inlet of the post-acceleration channel (66) is formed at the bottom of the guiding inclined surface (62), and an outlet groove (68) communicating with the outlet of the post-acceleration channel (66) is formed at the top of the guiding inclined surface (62).

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