Efficient spiral axial flow type gas treatment pump

Abstract

The invention discloses an efficient spiral axial-flow type gas treatment pump, and belongs to the technical field of axial-flow type multiphase pumps, the efficient spiral axial-flow type gas treatment pump comprises a mounting rack and a pump body mounted on the mounting rack, a motor is fixed on the mounting rack, the pump body is connected with 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; by means of the impeller, the rectifier and the space adjusting unit, when crude oil and associated gas spirally advance under the action of the movable blades, part of the crude oil and associated gas enter the front acceleration channel through the liquid inlet to be accelerated, the crude oil and associated gas in the pump body are impacted through the liquid outlet, an air bag is broken, gas-liquid mixing is promoted, and a gas phase gathering area is reduced; meanwhile, after the fluid passes through the rectifier and is matched with the impeller, the medium can move in the axial direction, gas-liquid separation is further prevented, when the fluid makes contact with the surfaces of the stationary blades, part of the fluid enters the circulating grooves to circulate, the fluid flowing between every two stationary blades is impacted, and the gas-liquid separation situation is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of axial flow mixed-flow pumps, and in particular to a high-efficiency spiral axial flow gas processing pump. Background Art

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

[0003] The working principle of the spiral axial flow mixed flow pump is: the multiphase medium being transported obtains energy through the rotation of the impeller. It consists of several compression units, each of which includes an impeller and a rectifier. When the transported medium enters the impeller, the medium is accelerated to obtain kinetic energy due to the rotation of the impeller. 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 the energy is increased.

[0004] The axial flow mixed flow pump is manufactured based on the principles of single-phase pumps and compressors. It can transport both single-phase and multi-phase flows. When transporting multi-phase flows, the mixed flow pump is often accompanied by complex phenomena such as the aggregation and separation of bubbles and the separation and mixing of phases, which can easily cause flow separation and local air blockage, making it 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 a high-efficiency spiral axial flow gas treatment pump to solve the problem that when an axial flow mixed pump transports multiphase flow, there are often complex phenomena such as the aggregation and separation of bubbles and the separation and mixing of phases in the mixed pump, which is very likely to cause flow separation and local air blockage, and thus the efficient and stable operation of the pump cannot be guaranteed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-efficiency spiral axial flow gas treatment pump comprises 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 mounted on the main shaft, and a rectifier is mounted between the two impellers;

[0008] The impeller comprises a truncated cone hub mounted on the main shaft, the truncated cone hub is provided with a plurality of moving blades, and a front acceleration channel is provided in the moving blades;

[0009] The main shaft, driven by the motor, drives the spirally distributed moving blades on the truncated cone hub to rotate and work, so that the crude oil and associated gas entering the pump body gain kinetic energy. At the same time, part of the crude oil and associated gas enter the front acceleration channel through the inlet to accelerate circulation, and impact the crude oil and associated gas in the pump body through the outlet, thereby promoting gas-liquid mixing and reducing gas phase aggregation.

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

[0011] The pump body comprises a pump casing, the main shaft is rotatably connected in the pump casing, and two connecting flanges are fixedly connected on the pump casing.

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

[0013] A liquid inlet connected to the front acceleration channel is provided on one side of the moving blade, a liquid outlet connected to 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 comprises a front oblique piercing rod fixed on the inner wall at the inlet of the front acceleration channel and a rear oblique piercing rod fixed on the inner wall at the outlet of the front acceleration channel. A cross piercing rod is fixed in the middle of the inner cavity of the front acceleration channel. The front oblique piercing rod, the rear oblique piercing rod and the cross piercing rod are all in sheet shape and have smooth surfaces.

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

[0017] The rectifier comprises a cylindrical hub, on which at least nine stationary blades are fixed, two flow slots are arranged in the stationary blades, and two inlet and outlet slots connected with the two flow slots are respectively arranged on both sides of the stationary blades.

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

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

[0020] The space adjustment unit comprises a piston seat sleeved on the main shaft, a guide slope is formed on one side of the piston seat close to the truncated cone hub, and the piston seat is slidably connected to the pump housing via a slider, so that the piston seat can slide along the main shaft.

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

[0022] A pressure groove is provided on one side of the piston seat away from the truncated cone hub, and a buffer pad is fixed to the inner wall of the pressure groove and a side wall of the pump housing, and an elastic member is fixedly connected to the two buffer pads.

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

[0024] Two symmetrical rear acceleration channels are arranged in the piston seat, an inlet groove connected to the inlet of the rear acceleration channel is opened at the bottom of the guide slope, and an outlet groove connected to the outlet of the rear acceleration channel is opened at the top of the guide slope.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] Through the impeller, rectifier and space adjustment unit, the truncated hub with moving blades rotates with the main shaft, so that the crude oil and associated gas entering the pump body can obtain kinetic energy, and complete the energy conversion under the action of the stationary blades on the cylindrical hub, converting the velocity circulation of the crude oil and associated gas, and converting the kinetic energy into pressure energy;

[0027] When the crude oil and associated gas advance in a spiral 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 accelerate, and impact the crude oil and associated gas in the pump body through the liquid outlet, which can break the air pocket, promote gas-liquid mixing and reduce the gas phase aggregation area. At the same time, after passing through the rectifier, the impeller can make the medium move axially to further prevent gas-liquid separation. At the same time, the design of the stationary blades can effectively slow down the scouring of the inner wall of the pump casing by the fluid, and when the fluid contacts the surface of the stationary blades, part of it will enter the circulation groove for circulation to impact the fluid flowing between the two stationary blades, further reducing the gas-liquid separation.

[0028] At the same time, when the flow rate is in a normal state, the pressure generated by the fluid on the piston seat during axial flow can drive the elastic member to compress, thereby making the vertical surface of the piston seat fit with the inner wall of the pump casing. In this state, the outlet on the pump casing is fully open, and the fluid can pass quickly after normal pressurization. When the flow rate is small, the pressure of the fluid on the piston seat can no longer drive the elastic member to compress. At this time, the piston seat moves toward the impeller side, so that the space at the outlet end of the pump casing is compressed, and the outlet is reduced at the same time. At this time, the fluid can flow quickly even when the flow rate is small. In both states, the guiding slope can guide the fluid to the outlet. At the same time, during the diversion process, part of the fluid will enter the rear acceleration channel for acceleration, and rush out from the outlet groove to the pump casing outlet, impacting the fluid flowing into the pump casing outlet, further reducing gas-liquid separation and other conditions;

[0029] The coordinated use of the above can effectively prevent gas-liquid flow separation and local gas blockage, ensuring efficient and stable operation of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a three-dimensional structure provided in an embodiment of the present invention is shown;

[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 structural diagram 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] Fig. 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] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0048] A high-efficiency spiral axial flow gas treatment pump comprises 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 mounted on the main shaft 23, and a rectifier 50 is mounted between the two impellers 40;

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

[0050] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the impeller 40 includes a truncated cone hub 41 mounted on the main shaft 23, a plurality of moving blades 42 are disposed on the truncated cone hub 41, and a front acceleration channel 43 is disposed in the moving blades 42;

[0051] The main shaft 23, driven by the motor 30, drives the spirally distributed moving blades 42 on the truncated cone hub 41 to rotate and work, so that the crude oil and associated gas entering the pump body 20 gain kinetic energy. At the same time, part of the crude oil and associated gas enter the front acceleration channel 43 through the liquid inlet 44 to accelerate the circulation, and impact the crude oil and associated gas in the pump body 20 through the liquid outlet 45, thereby promoting gas-liquid mixing and reducing gas phase aggregation.

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

[0053] The defoaming unit 46 includes a front oblique piercing rod 461 fixed on the inner wall of the inlet of the front accelerating channel 43 and a rear oblique piercing rod 462 fixed on the inner wall of the outlet of the front accelerating channel 43. A cross piercing rod 463 is fixed in the middle of the inner cavity of the front accelerating channel 43. The front oblique piercing rod 461, the rear oblique piercing rod 462 and the cross piercing rod 463 are all in sheet shape and have smooth surfaces.

[0054] Specifically, when part of the crude oil and associated gas enters the front acceleration channel 43 through the liquid inlet 44, they will first contact the front oblique piercing rod 461, and the front oblique piercing rod 461 can puncture the air bags formed in the entering fluid. Then the fluid will contact the cross piercing rod 463 and the rear oblique piercing rod 462, and the cross piercing rod 463 and the rear oblique piercing rod 462 can puncture the air bags generated in the process of the fluid continuously accelerating in the channel. At the same time, since the inner cavity of the front acceleration channel 43 gradually decreases, the fluid can be accelerated while squeezing the attached air bags, causing the air bags to be squeezed and ruptured.

[0055] like Figure 2 , Figure 3 , Figure 4 and Fig. 9 As shown, the rectifier 50 includes a cylindrical hub 51, on which at least nine stationary blades 52 are fixed, two flow slots 53 are provided in the stationary blades 52, and two inlet and outlet slots 54 connected to the two flow slots 53 are respectively provided on both sides of the stationary blades 52;

[0056] Preferably, the stationary blade 52 is "wave-shaped", the inner cavities of the two flow slots 53 are of the same size, and the inner diameters of the flow slots 53 from the inlet to the outlet are the same;

[0057] Specifically, when the spirally advancing fluid contacts the stationary blades 52, the kinetic energy of the fluid is converted into pressure energy. At the same time, part of the fluid in the process will enter the circulation groove 53, and the fluid will be re-injected into the fluid between the two stationary blades 52 through the inlet and outlet grooves 54 at the tail of the circulation groove 53 to promote gas-liquid mixing and reduce gas-liquid flow separation.

[0058] like 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, and a guide slope 62 is formed on one side of the piston seat 61 close to the truncated cone hub 41. The piston seat 61 is slidably connected to the pump housing 21 through a slider, so that the piston seat 61 can slide along the main shaft 23;

[0059] The two side walls of the pump housing 21 near the piston seat 61 are provided with a slide groove adapted to the slider, so that the piston seat 61 can slide along the main shaft 23 in the pump housing 21. At the same time, the piston seat 61 is sleeved on the main shaft 23, so it will not rotate with the rotation of the main shaft 23, and the outer wall of the piston seat 61 and the pump housing 21 are always kept in a sealed state;

[0060] A pressure groove 63 is formed on one side of the piston seat 61 away from the truncated cone hub 41. A buffer pad 64 is fixed to 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.

[0061] Two symmetrical rear acceleration channels 66 are provided in the piston seat 61. An inlet groove 67 connected to the inlet of the rear acceleration channel 66 is provided at the bottom of the guide slope 62. The inlet groove 67 is in a cone shape with a larger outside and a smaller inside, so that the external fluid can easily enter the rear acceleration channel 66 through the inlet groove 67. An outlet groove 68 connected to the outlet of the rear acceleration channel 66 is provided at the top of the guide slope 62. The outlet groove 68 is in a cone shape with a larger inside and a smaller outside, so that it is difficult for the external fluid to enter the rear acceleration channel 66 through the outlet groove 68.

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

[0063] First, the motor 30 is started to rotate the main shaft 23, thereby driving the impeller 40 and the rectifier 50 to rotate, and the crude oil and associated gas entering the pump housing 21 through the connection flange 22 away from the space adjustment unit 60 are advanced in a spiral axial flow, and obtain kinetic energy under the action of the moving blades 42 at the front end, and flow rapidly. During the process, part of the crude oil and associated gas enter the front acceleration channel 43 through the liquid inlet 44 and gradually accelerate, and flow out through the liquid outlet 45, impacting the crude oil and associated gas in the pump housing 21, and then breaking the air bag, thereby 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 is converted into pressure energy under the action of the stationary blades 52. At the same time, part of the fluid enters the flow slot 53. The fluid is re-injected into the fluid between the two stationary blades 52 through the inlet and outlet slots 54 at the tail of the flow slot 53 to promote gas-liquid mixing and further reduce gas-liquid flow separation.

[0065] Finally, the fluid flows out to the next stage through the connection 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, thereby making the vertical surface of the piston seat 61 fit the inner wall of the pump housing 21. In this state, the outlet on the pump housing 21 is fully opened, and the fluid can pass quickly after normal pressurization.

[0066] When the flow rate is small, the pressure of the fluid on the piston seat 61 can no longer drive the elastic member 65 to compress. At this time, the piston seat 61 moves toward the side of the impeller 40, so that the space at the outlet end of the pump casing 21 is compressed, and the outlet is reduced. At this time, the fluid can flow quickly even when the flow rate is small. In both states, the guide slope 62 can guide the fluid to the outlet. At the same time, during the diversion process, part of the fluid will enter the rear acceleration channel 66 for acceleration, 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, further reducing gas-liquid separation and the like.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency 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) being fixed on the mounting frame (10), the pump body (20) being connected to the motor (30) via a main shaft (23), characterized in that: At least two impellers (40) are mounted on the main shaft (23), and a rectifier (50) is mounted between the two impellers (40); The impeller (40) comprises a truncated cone hub (41) mounted on the main shaft (23), a plurality of moving blades (42) are arranged on the truncated cone hub (41), and a front acceleration channel (43) is arranged inside the moving blades (42); The main shaft (23) is driven by the motor (30) to drive the spirally distributed moving blades (42) on the truncated cone hub (41) to rotate and perform 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 circulation, and impact the crude oil and associated gas in the pump body (20) through the outlet, thereby promoting gas-liquid mixing and reducing gas phase aggregation.

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

3. A high-efficiency spiral axial flow gas treatment pump according to claim 1, characterized in that: A liquid inlet (44) connected to the front acceleration channel (43) is provided on one side of the moving blade (42), a liquid outlet (45) connected to the front acceleration channel (43) is provided on the other side of the moving blade (42), and a defoaming unit (46) is provided on the inner wall of the front acceleration channel (43).

4. A high-efficiency spiral axial flow gas treatment pump according to claim 3, characterized in that: The defoaming unit (46) comprises a front oblique piercing rod (461) fixed on the inner wall at the entrance of the front acceleration channel (43) and a rear oblique piercing rod (462) fixed on the inner wall at the exit of the front acceleration channel (43); a cross piercing rod (463) is fixed in the middle of the inner cavity of the front acceleration channel (43); the front oblique piercing rod (461), the rear oblique piercing rod (462) and the cross piercing rod (463) are all in sheet shape and have smooth surfaces.

5. A high-efficiency spiral axial flow gas treatment pump according to claim 1, characterized in that: The rectifier (50) comprises a cylindrical hub (51), on which at least nine stationary blades (52) are fixed, two flow grooves (53) are arranged in the stationary blades (52), and two inlet and outlet grooves (54) connected to the two flow grooves (53) are respectively arranged on both sides of the stationary blades (52).

6. A high-efficiency spiral axial flow gas treatment pump according to claim 2, characterized in that: A space adjustment unit (60) is installed on one side wall of the pump housing (21); The space adjustment unit (60) comprises a piston seat (61) sleeved on the main shaft (23), a guide inclined surface (62) being formed on a side of the piston seat (61) close to the truncated cone hub (41), and the piston seat (61) is slidably connected to the pump housing (21) via a slider, so that the piston seat (61) can slide along the main shaft (23).

7. A high-efficiency spiral axial flow gas treatment pump according to claim 6, characterized in that: A pressure groove (63) is provided on the side of the piston seat (61) away from the truncated cone hub (41), and a buffer pad (64) is fixed to the inner wall of the pressure groove (63) and a side wall of the pump housing (21), and an elastic member (65) is fixedly connected to the two buffer pads (64).

8. A high-efficiency spiral axial flow gas treatment pump according to claim 6, characterized in that: Two symmetrical rear acceleration channels (66) are arranged in the piston seat (61); an inlet groove (67) communicating with the inlet of the rear acceleration channel (66) is arranged at the bottom of the guide slope (62); and an outlet groove (68) communicating with the outlet of the rear acceleration channel (66) is arranged at the top of the guide slope (62).

Images