pipeline pump

Abstract

The present invention provides a pipeline pump, comprising: a pump housing, a pump impeller, a motor assembly, and a porous medium; a support shaft is provided in the pump housing, and the pump impeller is rotatably connected to the support shaft; the inner wall surface of the pump housing is recessed toward the outer wall surface of the pump housing to form a first annular groove and a second annular groove, and a third annular groove is formed by recessing the groove wall of the first annular groove; the motor stator is provided at the groove bottom of the second annular groove, and the motor rotor is provided at the wheel rim of the pump impeller and arranged opposite to the motor stator; the rotor body is located at the first annular groove, the guide plate is embedded in the third annular groove, and the porous medium is located in the third annular groove. In the pipeline pump of the present invention, a first gap, a second gap, and a third gap are formed in sequence between the motor rotor, the motor stator, and the annular grooves. When the fluid flows into the second gap along the first gap or the third gap, the porous medium can effectively intercept impurities in the fluid, thereby improving the reliability of the pipeline pump operation.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline pumps, and in particular to a pipeline pump. Background Art

[0002] Compared with traditional water pumps, pipeline pumps have a more compact overall structure, which can effectively reduce the total volume and weight of the pump and facilitate installation. They change the driving mode of the prime motor and improve the overall vibration and noise characteristics of the pump. At the same time, they have no dynamic sealing components, which effectively solves the problem of pump leakage. They are widely used in shipbuilding, aerospace, petrochemical and other fields.

[0003] The motor rotor in the pipeline pump is arranged at the rim of the pump impeller, and the cooling channel of the motor is located between the motor rotor and the motor stator. In the existing technology, the cooling channel mostly adopts a direct current through channel. Impurities in the cooling fluid can easily enter the cooling channel from the cooling channel entrance, causing wear on the motor stator and motor rotor, affecting the normal operation of the motor, and thus affecting the operation of the pipeline pump. Summary of the Invention

[0004] The present invention provides a pipeline pump for solving the problem in existing pipeline pumps that impurities easily enter the cooling channel between the motor rotor and the motor stator, thereby affecting the reliability of the pipeline pump.

[0005] The present invention provides a pipeline pump, comprising: a pump casing, a pump impeller, a motor assembly and a porous medium;

[0006] A support shaft is provided in the pump housing along its central axis, and the pump impeller is rotatably connected to the support shaft;

[0007] The inner wall surface of the pump housing is recessed toward the outer wall surface of the pump housing to form a first annular groove and a second annular groove, the first annular groove and the second annular groove are communicated with each other, and a third annular groove is recessed by the groove wall of the first annular groove toward the end surface of the pump housing to form a third annular groove;

[0008] The motor assembly includes a motor rotor and a motor stator, wherein the motor stator is arranged at the bottom of the second annular groove, and the motor rotor is arranged at the rim of the pump impeller and is arranged opposite to the motor stator;

[0009] The motor rotor includes a rotor body and a guide plate formed by protruding from the end surface of the rotor body. The rotor body is located at the first annular groove, the guide plate is embedded in the third annular groove, and the porous medium is located in the third annular groove.

[0010] According to a pipeline pump provided by the present invention, there are two guide plates, which are respectively located at the inner edge and the outer edge of the end surface of the rotor body, and the porous medium is located between the two guide plates.

[0011] According to a pipeline pump provided by the present invention, the porous medium is made of iron-nickel-copper or aluminum-nickel-copper.

[0012] According to the pipeline pump provided by the present invention, the porosity of the porous medium is 35% to 45%.

[0013] According to a pipeline pump provided by the present invention, the porous medium is composed of spherical particles of various sizes, and the particle size of the spherical particles is 1 to 2 mm.

[0014] According to a pipeline pump provided by the present invention, the pipeline pump further includes a liquid storage tank;

[0015] The liquid storage tank is arranged on the outer wall surface of the pump housing, and is communicated with the second annular groove or the third annular groove through a delivery pipeline. The liquid storage tank is used to store the drag reducing liquid.

[0016] According to a pipeline pump provided by the present invention, the drag reducing fluid includes polyacrylamide or polyethylene oxide.

[0017] According to a pipeline pump provided by the present invention, the delivery pipeline includes a first branch and a second branch;

[0018] One end of the first branch is in communication with the liquid storage tank, and the other end of the first branch is in communication with the bottom of the third annular groove;

[0019] One end of the second branch is communicated with the liquid storage tank, and the other end of the second branch is communicated with the bottom of the second annular groove.

[0020] According to a pipeline pump provided by the present invention, a first opening and closing valve is provided at one end of the first branch close to the third annular groove, and a second opening and closing valve is provided at one end of the second branch close to the second annular groove;

[0021] The first on-off valve is opened and closed based on the pressure difference on two opposite sides of the first on-off valve, and the second on-off valve is opened and closed based on the pressure difference on two opposite sides of the second on-off valve.

[0022] According to a pipeline pump provided by the present invention, the first on-off valve and the second on-off valve are made of a flexible material.

[0023] The pipeline pump provided by the present invention has a first annular groove, a second annular groove and a third annular groove formed on the inner wall of the pump casing, which are interconnected. The rotor body of the motor rotor is located in the first annular groove, and the guide plate convexly formed on the end surface of the rotor body is embedded in the third annular groove. The porous medium is filled in the third annular groove, and the motor stator is built into the groove bottom of the second annular groove. A first gap, a second gap and a third gap that are connected in sequence are formed between the motor rotor, the motor stator and the annular groove. In the process of the fluid flowing into the second gap along the first gap or the third gap, the porous medium can effectively intercept impurities in the fluid, ensure the reliable operation of the motor rotor and the motor stator, and help improve the reliability of the pipeline pump operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a cross-sectional schematic diagram of the pipeline pump provided by the present invention;

[0026] Figure 2 The present invention shows Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0027] Figure 3 The present invention shows Figure 1 Schematic diagram of the local enlarged structure at B in the middle;

[0028] Figure 4 The present invention shows Figure 1 Schematic diagram of the local enlarged structure at C in the middle;

[0029] Figure 5 This is a right side view of the pipeline pump provided by the present invention;

[0030] Figure 6 It is a left side view of the pipeline pump provided by the present invention;

[0031] Figure 7 It is a side view of the pipeline pump provided by the present invention;

[0032] Figure numerals: 1: support shaft; 2: pump impeller; 3: motor rotor; 301: rotor body; 302: guide plate; 4: second gap; 5: pump housing; 6: guide impeller; 7: first branch; 8: second branch; 9: liquid storage tank; 10: third gap inlet; 11: third gap outlet; 12: support plate; 13: porous medium; 14: first gap inlet; 15: first gap outlet; 16: first opening and closing valve; 17: second opening and closing valve. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The following combination Figures 1 to 7 A pipeline pump according to an embodiment of the present invention is described.

[0036] like Figures 1 to 6 As shown, the pipeline pump provided by the embodiment of the present invention includes: a pump housing 5, a pump impeller 2, a motor assembly and a porous medium 13; a support shaft 1 arranged along its axis is provided in the pump housing 5, and the pump impeller 2 is rotatably connected to the support shaft 1; the inner wall surface of the pump housing 5 is recessed toward the outer wall surface of the pump housing 5 to form a first annular groove and a second annular groove, the first annular groove and the second annular groove are connected, and a third annular groove is recessed by the groove wall of the first annular groove toward the end surface of the pump housing 5 to form; the motor assembly includes a motor rotor 3 and a motor stator, the motor stator is arranged at the groove bottom of the second annular groove, the motor rotor 3 is arranged at the wheel rim of the pump impeller 2, and is arranged opposite to the motor stator; the motor rotor 3 includes a rotor body 301 and a guide plate 302 formed by a protrusion on the end surface of the rotor body 301, the rotor body 301 is located at the first annular groove, the guide plate 302 is embedded in the third annular groove, and the porous medium 13 is located in the third annular groove.

[0037] Specifically, a support shaft 1 is provided in the pump housing 5 along its central axis, and the support shaft 1 and the pump housing 5 are connected by a guide impeller 6. The two opposite ends of the pump housing 5 are defined as the inlet end of the pump housing 5 and the outlet end of the pump housing 5. The fluid flows into the pump housing 5 from the inlet end and flows out from the outlet end of the pump housing 5. The guide impeller 6 is close to the outlet end of the pump housing 5. The guide impeller 6 is used to recover the circumferential velocity of the fluid, increase the static pressure of the fluid, and then send the fluid out from the outlet end of the pump housing 5. The motor assembly includes a motor rotor 3 and a motor stator. The motor rotor 3 is integrated on the rim of the pump impeller 2. The motor rotor 3 cooperates with the motor stator on the inner wall of the pump housing 5 to form a motor assembly, thereby driving the pump impeller 2 to rotate around the support shaft 1, ensuring the compactness of the overall structure of the pipeline pump. The pump housing 5 is a straight cylindrical structure so that the pump impeller 2 can pump the fluid in a straight-in and straight-out manner.

[0038] A first annular groove and a second annular groove are formed radially from the inner wall of the pump housing 5 toward the outer wall of the pump housing 5. The first and second annular grooves are coaxially disposed and communicate with each other. The length of the first annular groove along the axial direction of the pump housing 5 is smaller than the length of the second annular groove along the axial direction of the pump housing 5. A third annular groove is formed by recessing the groove wall of the first annular groove along the axial direction of the pump housing 5. The third annular groove communicates with the first annular groove.

[0039] The motor rotor 3 includes a rotor body 301, which is a rotating body. The inner and outer diameters of the rotor body 301 are set according to actual needs. A guide plate 302 is formed on the end surface of the rotor body 301. Each of the two opposing end surfaces of the rotor body 301 is provided with a guide plate 302. The guide plates 302 are annular and arranged circumferentially around the axis of the rotor body 301. The guide plates 302 can be located near the inner edge of the end surface of the rotor body 301, near the outer edge of the end surface of the rotor body 301, or near the middle of the end surface of the rotor body 301. The motor stator is embedded in the bottom of the second annular groove, while the rotor body 301 of the motor rotor 3 is located in the first annular groove. The guide plates 302 are embedded in the third annular groove. It is understood that there is a gap between the guide plates 302 and the side walls and bottom of the third annular groove.

[0040] The end of the motor rotor 3 near the outlet end of the pump housing 5 is defined as the first end of the motor rotor 3, and the end of the motor rotor 3 near the inlet end of the pump housing 5 is defined as the second end of the motor rotor 3. Thus, the first end of the motor rotor 3 and the third annular groove near the outlet end of the pump housing 5 form a first gap, a second gap 4 is formed between the motor rotor 3 and the motor stator, and a third gap is formed between the second end of the motor rotor 3 and the third annular groove near the inlet end of the pump housing 5. The first gap, the second gap 4, and the third gap are interconnected, and the third annular groove is filled with a porous medium 13.

[0041] The first gap, the second gap 4, and the third gap are connected in sequence, forming a cooling channel for cooling the motor stator and the motor rotor 3. When the pipeline pump is pumping fluid, the fluid pressure downstream is greater than the fluid pressure upstream, that is, the fluid pressure near the outlet end of the pump housing 5 is greater than the fluid pressure near the inlet end of the pump housing 5. Due to this pressure difference, a portion of the fluid will flow into the first gap inlet 14, flow through the second gap 4 between the motor rotor 3 and the motor stator, naturally cooling the motor stator and motor rotor 3, and then flow out through the third gap outlet 11.

[0042] Pipeline pumps can be used in fields such as marine engineering, aerospace, and petrochemicals. For example, in a ship's cooling system, the fluid used is seawater. The pump pumps the seawater into a heat exchanger, allowing the seawater to exchange heat with the hot fluid. Seawater often contains impurities, which flow into the cooling channel and cause wear on the motor rotor 3 and stator. In severe cases, this can cause the pump to stall, affecting its normal operation.

[0043] In the present application, the guide plate 302 at the first end of the motor rotor 3 is embedded in the third annular groove near the outlet end of the pump housing 5. Seawater flows in through the first gap inlet 14, and the flow direction of the seawater is nearly perpendicular to the axial direction of the pump housing 5. The seawater then flows through the gap between the side groove wall of the third annular groove and the guide plate 302, flows through the porous medium 13 provided in the third annular groove, and then flows into the second gap 4 through the first gap outlet 15. As the seawater flows from the first gap into the second gap 4, the porous medium 13 effectively prevents impurities in the seawater from passing through the first gap into the second gap 4, ensuring the reliable operation of the motor rotor 3 and the motor stator.

[0044] The guide plate 302 at the second end of the motor rotor 3 is embedded in the third annular groove near the inlet end of the pump housing 5. After heat exchange with the motor stator and motor rotor 3 in the second gap 4, the seawater flows out through the third gap inlet 10. The seawater then flows through the porous medium 13 disposed within the third annular groove, then through the gap between the side groove wall of the third annular groove and the guide plate 302, before flowing out through the third gap outlet 11. The structure of the guide plate 302, the third annular groove, and the porous medium 13 at the second end of the motor rotor 3 effectively prevents impurities in the seawater from entering the second gap 4 when the seawater flows back into the third gap, thereby ensuring the reliable operation of the motor rotor 3 and the motor stator.

[0045] In an embodiment of the present invention, a first annular groove, a second annular groove and a third annular groove are formed on the inner wall of the pump housing 5, and the rotor body 301 of the motor rotor 3 is located at the first annular groove. The guide plate 302 convexly provided on the end surface of the rotor body 301 is embedded in the third annular groove. The porous medium 13 is filled in the third annular groove, and the motor stator is built into the bottom of the second annular groove. A first gap, a second gap 4 and a third gap that are connected in sequence are formed between the motor rotor 3, the motor stator and the annular grooves. In the process of the fluid flowing into the second gap 4 along the first gap or the third gap, the porous medium 13 can effectively intercept impurities in the fluid, ensure the reliable operation of the motor rotor 3 and the motor stator, and help improve the reliability of the pipeline pump operation.

[0046] like Figure 1 、 Figure 2 and Figure 4 As shown, in an optional embodiment, there are two guide plates 302 , which are respectively located at the inner edge and the outer edge of the end surface of the rotor body 301 , and the porous medium 13 is located between the two guide plates 302 .

[0047] Specifically, two guide plates 302 are provided on each end face of the rotor body 301, positioned near the inner and outer edges of the end face of the rotor body 301, respectively. Both guide plates 302 are embedded in the third annular groove. The guide plate 302 located near the inner wall of the pump housing 5 is defined as the first guide plate, and the guide plate 302 located near the outer wall of the pump housing 5 is defined as the second guide plate. A support plate 12 is formed by protruding from the bottom of the third annular groove. The support plate 12 is arranged circumferentially around the axis of the third annular groove and has opposing first and second walls. A first accommodation space is formed between the first guide plate and the first wall of the support plate 12. The porous medium 13 can be secured to the first wall of the support plate 12 by welding. It is understood that a gap exists between the porous medium 13 and the wall of the first guide plate 302, and between the porous medium 13 and the end face of the rotor body 301, allowing seawater to flow into or out of the cooling channel.

[0048] A second accommodating space is formed between the second guide plate and the second wall surface of the support plate 12. The porous medium 13 can be fixed to the second wall surface of the support plate 12 by welding. It can be understood that there is a gap between the porous medium 13 and the wall surface of the second guide plate 302, and there is also a gap between the porous medium 13 and the end face of the rotor body 301, so that seawater can flow into or out of the cooling channel.

[0049] There can be multiple support plates 12. In this case, the area between two adjacent support plates 12 can also be filled with porous medium 13. Multiple support plates 12 help ensure that the porous medium 13 is not easily deformed by the continuous flushing of the fluid. In the case of a single support plate 12, the porous medium 13 includes two porous medium layers, which are respectively fixed to the first and second walls of the support plate 12. This not only meets the requirement of intercepting impurities, but also provides sufficient strength to ensure that the porous medium 13 is not easily deformed.

[0050] In an embodiment of the present invention, two guide plates 302 are spaced apart at the end face of the rotor body 301, and a ring-shaped support plate 12 is convexly provided on the bottom of the third annular groove. The support plate 12 is located between the two guide plates 302, and the two guide plates 302 are respectively arranged close to the side groove walls of the third annular groove. A porous medium 13 is provided on the opposite wall surface of the support plate 12, which has a compact structure and can effectively intercept impurities in the fluid, thereby ensuring the reliability of the operation of the motor assembly.

[0051] In an optional embodiment, the porous medium 13 is made of copper-nickel alloy or copper-nickel alloy.

[0052] Specifically, the porous medium 13 can be made of corrosion-resistant materials such as copper-nickel alloy, aluminum-nickel alloy, manganese-nickel alloy, or zinc-nickel alloy. Adding nickel to pure copper significantly improves the material's strength, corrosion resistance, and hardness. Copper-nickel alloy has high strength and excellent corrosion resistance, especially resistance to flowing seawater corrosion. Copper-nickel alloy is widely used in equipment with high corrosion resistance requirements, such as condensers and heat exchanger tubes. Aluminum-nickel alloy has good corrosion resistance and weldability. Manganese-nickel alloy has good corrosion resistance and good workability. Zinc-nickel alloy has excellent corrosion resistance and good hot and cold working formability.

[0053] The fluid continuously flows from the first gap inlet 14 through the porous medium 13 into the second gap 4, then flows through the third gap inlet through the porous medium 13 before exiting. Porous medium 13 remains in contact with the fluid for a prolonged period. Using corrosion-resistant materials effectively prevents rust from forming on porous medium 13, which could reduce porosity and affect fluid circulation within the cooling channel.

[0054] In the embodiment of the present invention, the porous medium 13 is made of materials such as copper-nickel alloy or aluminum-nickel alloy, which can effectively prevent the porous medium 13 from being corroded during long-term contact with the fluid and ensure the smooth flow of the fluid in the cooling channel.

[0055] In an optional embodiment, the porosity of the porous medium 13 is 35% to 45%. If the porosity of the porous medium 13 is too large, it cannot effectively prevent impurities in the fluid from entering the cooling channel. Impurities flowing into the cooling channel will damage the motor rotor 3 and the motor stator. If the porosity of the porous medium 13 is too small, the flow resistance of the fluid flowing into the cooling channel from the first gap is large, and the flow resistance of the fluid flowing out of the cooling channel from the third gap is also large, affecting the circulation flow of the fluid in the cooling channel. The heat of the motor rotor 3 and the motor stator cannot be effectively dissipated, affecting the service life of the motor assembly. The porosity of the porous medium 13 is 35% to 45%, which can not only effectively prevent impurities in the fluid, but also facilitate the circulation of the fluid in the cooling channel, which is beneficial to ensuring the service life of the motor assembly.

[0056] In an optional embodiment, the porous medium 13 is composed of spherical particles of various sizes, and the particle size of the spherical particles is 1 to 2 mm.

[0057] Specifically, the porous medium 13 is composed of spherical particles of various sizes of iron-nickel-copper alloy. The particle size of the spherical particles ranges from 1 to 2 mm. The particle size of the spherical particles can be 1 mm, 1.2 mm, 1.4 mm, etc. The spherical particles of various sizes are stacked together to form the porous medium 13, ensuring that the porosity of the porous matrix meets the requirements. The particle size of the spherical particles of the porous medium 13 ranges from 1 to 2 mm. When the porosity of the porous medium 13 is 40%, the permeability of the porous medium 13 is 1.19*10 3 D~4.80*10 3D, the inertia coefficient of the porous medium 13 is about 1.64*10 6 m -2 ~4.10*10 6 m -2 .

[0058] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 7 As shown, in an optional embodiment, the pipeline pump further includes a liquid storage tank 9; the liquid storage tank 9 is provided on the outer wall of the pump housing 5, and the liquid storage tank 9 is connected to the second annular groove or the third annular groove through a delivery pipeline, and the liquid storage tank 9 is used to store the drag reducing liquid.

[0059] Specifically, one end of the delivery pipeline is connected to the liquid storage tank 9, and the other end of the delivery pipeline passes through the bottom of the third annular groove and is connected to the third annular groove; or the other end of the delivery pipeline passes through the bottom of the second annular groove and is connected to the second annular groove; or the delivery pipeline has two branch pipelines, and the other end of the delivery pipeline is respectively connected to the third annular groove and the second annular groove through the two branch pipelines.

[0060] It is understood that the other end of the delivery pipeline is connected to the third annular groove near the outlet end of the pump housing 5. The drag-reducing fluid flows along the delivery pipeline to the first gap in the third annular groove. Seawater flows in through the first gap inlet 14, mixes with the drag-reducing fluid, flows through the first gap, and then flows into the second gap 4 through the first gap outlet 15. The mixing of the drag-reducing fluid and seawater reduces the flow resistance of the seawater, increases the flow rate of the seawater, and accelerates the circulation of the seawater in the cooling channel. The accelerated flow rate of seawater in the cooling channel facilitates the rapid removal of heat generated by the motor rotor 3 and the motor stator by the seawater, thereby ensuring the safe operation of the pipeline pump.

[0061] The pump housing 5 is provided with a through hole connecting the outer wall surface of the pump housing 5 and the bottom of the second annular groove. The other end of the delivery pipeline is connected to the second gap 4 through the through hole. The drag reducing fluid flows into the second gap 4 through the through hole. The drag reducing fluid mixes with seawater to reduce the flow resistance of the seawater, accelerate the flow speed of the seawater toward the third gap, and accelerate the discharge of seawater from the cooling channel to the outside, which is conducive to the seawater quickly dissipating the heat generated by the motor rotor 3 and the motor stator.

[0062] In an embodiment of the present invention, the liquid storage tank 9 is connected to the cooling channel through a delivery pipeline. The drag reducing liquid in the liquid storage tank 9 flows into the cooling channel from the first gap or the second gap 4. After the drag reducing liquid is mixed with the fluid, the flow resistance of the fluid is reduced, and the flow speed of the fluid in the cooling channel is accelerated, which is beneficial to quickly dissipate the heat generated by the motor rotor 3 and the motor stator, thereby ensuring the reliability of the pipeline pump operation.

[0063] In an alternative embodiment, the drag reducing fluid comprises polyacrylamide or polyethylene oxide.

[0064] Specifically, drag-reducing fluids include polyacrylamide, polyethylene oxide, or quaternary salts. The type of drag-reducing fluid can be selected based on the operating environment of the pipeline pump. Taking polyacrylamide as an example, a polyacrylamide solution of a preset concentration, such as 500 to 1500 ppm, is prepared. This polyacrylamide solution flows into the cooling channel and mixes with seawater, diluting the concentration to 50 to 200 ppm. The diluted polyacrylamide solution has a drag-reducing effect of approximately 30% to 60% on the seawater.

[0065] The seawater flow velocity within the cooling channel was compared under preset conditions: a flow length of 100 mm through the porous medium 13 and a driving pressure head of 1000 Pa. The spherical particles in the porous medium 13 had a particle size range of 1 to 2 mm. When the spherical particles were 1 mm in size and no polyacrylamide solution was added, the seawater flow velocity was approximately 0.012 m / s. When the spherical particles were 2 mm in size and no polyacrylamide solution was added, the seawater flow velocity was approximately 0.0244 m / s.

[0066] Under the same driving pressure head and flow length conditions, a polyacrylamide solution is introduced into the cooling channel through a delivery pipeline. When the particle size of the spherical particles of the porous medium 13 is 1 mm, the flow rate of seawater in the cooling channel can be increased from 0.012 m / s to 0.016 m / s to 0.026 m / s; when the particle size of the spherical particles of the porous medium 13 is 2 mm, the flow rate of seawater in the cooling channel can be increased from 0.0244 m / s to 0.027 m / s to 0.03 m / s. The addition of the polyacrylamide solution significantly increases the flow rate of seawater in the cooling channel, facilitating the rapid flow of seawater from the first gap into the second gap 4. After the seawater absorbs heat from the motor rotor 3 and the motor stator in the second gap 4, it is conducive to the rapid outflow of the seawater from the third gap, dissipating the heat from the motor rotor 3 and the motor stator.

[0067] In an embodiment of the present invention, the drag reducing fluid includes polyacrylamide, polyethylene oxide or a quaternary salt, etc. After the drag reducing fluid is mixed with the fluid, the flow resistance of the fluid is significantly reduced, and the process of the fluid flowing from the first gap inlet 14 through the porous medium 13 and then from the outlet of the first gap into the second gap 4 is accelerated, and the flow of the fluid in the second gap 4 is accelerated. At the same time, the process of the fluid flowing from the third gap inlet 10 through the porous medium 13 and then from the third gap outlet 11 into the channel of the pump housing 5 is accelerated, thereby accelerating the heat dissipation of the motor rotor 3 and the motor stator, thereby ensuring the operating reliability of the motor assembly.

[0068] like Figure 1 、 Figure 2 and Figure 3 As shown, in an optional embodiment, the delivery pipeline includes a first branch 7 and a second branch 8; one end of the first branch 7 is connected to the liquid storage tank 9, and the other end of the first branch 7 is connected to the bottom of the third annular groove; one end of the second branch 8 is connected to the liquid storage tank 9, and the other end of the second branch 8 is connected to the bottom of the second annular groove.

[0069] Specifically, the delivery pipeline includes a first branch 7 and a second branch 8. A flow channel is provided on the pump housing 5 near the outlet end of the pump housing 5. The flow channel includes a first flow channel and a second flow channel that are connected in sequence. The first flow channel extends perpendicular to the axis of the pump housing 5. One end of the first flow channel is connected to the outer wall of the pump housing 5, and the other end of the first flow channel is connected to one end of the second flow channel. The second flow channel extends parallel to the axis of the pump housing 5, and the other end of the second flow channel is connected to the bottom of the third annular groove. One end of the first delivery pipe is connected to the liquid storage tank 9, and the other end of the first delivery pipe is connected to one end of the first flow channel. Thus, the first delivery pipe, the first flow channel, and the second flow channel form the first branch 7. The drag reducing fluid flows from the first branch 7 into the first gap, mixes with the seawater flowing into the first gap inlet 14, flows through the porous medium in the first gap, and then flows into the second gap 4 through the first gap outlet 15.

[0070] The pump housing 5 is provided with a through hole, one end of which communicates with the outer wall of the pump housing 5 and the other end of which communicates with the bottom of the second annular groove. The axis of the through hole is perpendicular to the axis of the pump housing 5. A second delivery pipe is perpendicularly provided on the outer wall of the pump housing 5. One end of the second delivery pipe is connected to the liquid storage tank 9, and the other end of the second delivery pipe is connected to the outer wall of the pump housing 5 at the through hole. The second delivery pipe and the through hole thus form a second branch 8. The drag reducing fluid can flow into the second gap 4 through the second branch 8.

[0071] In an embodiment of the present invention, the delivery pipeline includes a first branch 7 and a second branch 8. The drag reducing liquid flows through the first branch 7 to the first gap and mixes with the fluid before flowing into the second gap 4. The drag reducing liquid can also flow into the second gap 4 through the second branch 8. The multiple branches enhance the mixing degree of the drag reducing liquid and the fluid, reduce the flow resistance of the fluid, and help accelerate the flow of the fluid in the cooling channel.

[0072] like Figure 2 and Figure 3As shown, in an optional embodiment, a first opening and closing valve 16 is provided at one end of the first branch 7 close to the third annular groove, and a second opening and closing valve 17 is provided at one end of the second branch 8 close to the second annular groove; the first opening and closing valve 16 is opened and closed based on the pressure difference on the opposite sides of the first opening and closing valve 16, and the second opening and closing valve 17 is opened and closed based on the pressure difference on the opposite sides of the second opening and closing valve 17.

[0073] Specifically, a first on-off valve 16 is provided at one end of the first branch 7 near the first gap entrance 14, and a second on-off valve 17 is provided at the second branch 8 near the second gap 4. The pressure in the liquid storage tank 9 is maintained relatively constant. The first on-off valve 16 and the second on-off valve 17 have the same structure. The on-off valves include a valve flap assembly, which includes multiple valve flaps. These multiple valve flaps are evenly arranged circumferentially around the axis of the on-off valve, with adjacent valve flaps positioned in close contact. The on-off valves open and close based on the pressure differential across the valve flap assembly.

[0074] Taking the first on-off valve 16 as an example, the side of the first on-off valve 16 facing away from the first gap is defined as the first side of the first on-off valve 16, and the side of the first on-off valve 16 facing the first gap is defined as the second side of the first on-off valve 16. When the seawater flow rate within the pump housing 5 is less than the preset flow rate, and the seawater flows from the first gap into the second gap 4, the pressure on the first side of the first on-off valve 16 is less than the pressure on the second side of the first on-off valve 16, and the first on-off valve 16 is in a closed state. As the seawater flow rate within the pump housing 5 increases, the seawater flow rate becomes greater than the preset flow rate, and the pressure on the first side of the first on-off valve 16 becomes greater than the pressure on the second side of the first on-off valve 16. Multiple valve flaps open, i.e., the first on-off valve 16 opens, and the drag reduction fluid flows to the first gap, mixes with the seawater, and then flows into the second gap 4 with the seawater.

[0075] As the speed of the pipeline pump motor increases, the cooling seawater flow rate required by the motor assembly gradually increases, the driving pressure head generated by the rotation of the motor rotor 3 also increases, the flow rate on the seawater side increases, the pressure difference on both sides of the first on-off valve 16 increases, the degree of opening of multiple valve discs increases, and the flow rate of the drag reducing fluid flowing to the first gap also increases, significantly reducing the flow resistance of the cooling seawater and meeting the cooling needs of the pipeline pump under high-speed operation.

[0076] The first on-off valve 16 opens and closes based on the pressure differential across the valve flap assembly. The extent of the valve flap opening can also be adjusted based on the seawater flow rate. When the motor rotor 3 speed is slower than a preset speed, the seawater flow rate within the pump housing 5 is slower than the preset flow rate, and the first on-off valve 16 closes. At this point, the motor assembly cooling requirements can be met without the addition of drag-reducing fluid, thus conserving the use of drag-reducing fluid. When the motor rotor 3 speed is faster than a preset speed, and the seawater flow rate within the pump housing 5 is faster than the preset flow rate, the valve flap assembly can automatically adjust the valve flap opening extent based on the motor's rotational speed, adapting to the motor assembly cooling requirements at varying speeds.

[0077] The second on-off valve 17 operates on the same principle as the first on-off valve 16. The side of the second on-off valve 17 facing away from the second gap 4 is defined as the first side of the second on-off valve 17, and the side of the second on-off valve 17 facing the second gap 4 is defined as the second side of the second on-off valve 17. When the speed of the motor rotor 3 is less than a preset speed, the second on-off valve 17 closes. At this time, the motor assembly's cooling needs can be met without the addition of drag-reducing fluid, which helps conserve the use of drag-reducing fluid. When the speed of the motor rotor 3 is greater than the preset speed, the valve flap assembly can adjust the opening amplitude of the valve flap according to the motor's speed, adapting to the cooling needs of the motor under different speed conditions.

[0078] Furthermore, when the pipeline pump is blocked, the temperature of the motor rotor 3 and the motor stator rises rapidly, the temperature of the seawater in the cooling channel rises, the pressure on the second side of the second on-off valve 17 increases, the valve flap assembly of the second on-off valve 17 opens in the reverse direction, the valve flap opening amplitude reaches the maximum, a large amount of drag reducing fluid flows into the cooling channel, and the flow of cooling seawater in the cooling channel is accelerated, thereby meeting the cooling requirements of the motor assembly under the blocked rotor condition and ensuring the operational safety of the pipeline pump.

[0079] In an embodiment of the present invention, a first opening and closing valve 16 is provided at the outlet end of the first branch 7, and a second opening and closing valve 17 is provided at the outlet end of the second branch 8. The first opening and closing valve 16 and the second opening and closing valve 17 can both be opened and closed based on the pressure difference on both sides of the valve flap assembly. At the same time, the opening amplitude of the valve flap can be adjusted according to the speed of the motor assembly to meet the cooling requirements of the motor assembly at different speeds, which is beneficial to saving operating costs and ensuring the safe operation of the pipeline pump.

[0080] In an optional embodiment, the first on-off valve 16 and the second on-off valve 17 are made of a flexible material.

[0081] Specifically, the valve flap assembly of the first on-off valve 16 and the valve flap assembly of the second on-off valve 17 can be made of liquid silicone. Liquid silicone has better corrosion resistance, better strength, toughness and resilience, and meets the use requirements.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pipeline pump, characterized in that: include: Pump housing, pump impeller, motor assembly, and porous media; A support shaft is provided in the pump housing along its central axis, and the pump impeller is rotatably connected to the support shaft; The inner wall surface of the pump housing is recessed toward the outer wall surface of the pump housing to form a first annular groove and a second annular groove, the first annular groove and the second annular groove are communicated with each other, and a third annular groove is recessed by the groove wall of the first annular groove toward the end surface of the pump housing to form a third annular groove; The motor assembly includes a motor rotor and a motor stator, wherein the motor stator is arranged at the bottom of the second annular groove, and the motor rotor is arranged at the rim of the pump impeller and is arranged opposite to the motor stator; The motor rotor includes a rotor body and a guide plate formed by protruding from the end surface of the rotor body, the rotor body is located in the first annular groove, the guide plate is embedded in the third annular groove, and the porous medium is located in the third annular groove; A first gap is formed between the first end of the motor rotor and the third annular groove near the outlet end of the pump housing, a second gap is formed between the motor rotor and the motor stator, and a third gap is formed between the second end of the motor rotor and the third annular groove near the inlet end of the pump housing. The first gap, the second gap, and the third gap are sequentially connected to form a cooling channel for cooling the motor stator and the motor rotor. There are two guide plates, which are respectively located at the inner edge and the outer edge of the end surface of the rotor body, and the porous medium is located between the two guide plates.

2. The pipeline pump according to claim 1, characterized in that: The porous medium is made of iron-nickel-copper or aluminum-nickel-copper.

3. The pipeline pump according to claim 1, characterized in that The porosity of the porous medium is 35% to 45%.

4. The pipeline pump according to claim 1, characterized in that The porous medium is composed of spherical particles of various sizes, and the particle size of the spherical particles is 1 to 2 mm.

5. The pipeline pump according to any one of claims 1 to 4, characterized in that: The pipeline pump also includes a liquid storage tank; The liquid storage tank is arranged on the outer wall surface of the pump housing, and is communicated with the second annular groove or the third annular groove through a delivery pipeline. The liquid storage tank is used to store the drag reducing liquid.

6. The pipeline pump according to claim 5, characterized in that: The drag reducing fluid includes polyacrylamide or polyethylene oxide.

7. The pipeline pump according to claim 5, characterized in that: The delivery pipeline includes a first branch and a second branch; One end of the first branch is in communication with the liquid storage tank, and the other end of the first branch is in communication with the bottom of the third annular groove; One end of the second branch is communicated with the liquid storage tank, and the other end of the second branch is communicated with the bottom of the second annular groove.

8. The pipeline pump according to claim 7, characterized in that: A first opening and closing valve is provided at one end of the first branch close to the third annular groove, and a second opening and closing valve is provided at one end of the second branch close to the second annular groove; The first on-off valve is opened and closed based on the pressure difference on two opposite sides of the first on-off valve, and the second on-off valve is opened and closed based on the pressure difference on two opposite sides of the second on-off valve.

9. The pipeline pump according to claim 8, characterized in that: The first on-off valve and the second on-off valve are made of flexible material.

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