A self-priming multistage centrifugal pump with an integrated disc motor

Abstract

The present invention discloses a self-priming multi-stage centrifugal pump with an integrated disc motor, including a housing assembly, a rotating mechanism and a driving mechanism, wherein the housing assembly includes an outer shell, a volute and a water inlet pipe; the rotating mechanism includes an impeller, and the impeller is rotatably arranged in the volute; the driving mechanism includes a rotor, a stator and a winding, the rotor is fixed on the impeller, the stator is fixed on the inner wall of the volute and coupled with the rotor, and the winding is wound on the stator. The beneficial effects of the present invention are: by integrating the stator and the rotor into the volute and the impeller respectively, there is no need to drive the impeller to rotate by an external motor, and the volume of the entire self-priming centrifugal pump can be reduced. At the same time, the stator and the rotor are arranged in the water in the volute, and the water inside the volute can also be used for natural heat dissipation. At the same time, since there is no need to set a fan for heat dissipation, the noise can be reduced, and since the motor is directly driven by electricity, there is no other device to consume energy, which is more efficient and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a self-priming multi-stage centrifugal pump with an integrated disc motor. Background Art

[0002] The centrifugal pump works by using the rotation of the impeller to make the water centrifugal. Before starting the water pump, the pump casing and the water suction pipe must be filled with water, and then the motor is started, so that the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing.

[0003] The existing centrifugal pump achieves the fluid conveying effect by driving the impeller to rotate through the rotating shaft on the motor. However, this combination includes a motor and a transmission shaft, which makes the centrifugal pump larger in size and longer in length. At the same time, the motor needs to be cooled by a radiator such as a fan after long-term use, and a large amount of noise will be generated when the fan is running. In addition, the shaft seal between the motor shaft and the centrifugal pump is prone to leakage after long-term use, which has certain defects. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a self-priming multi-stage centrifugal pump with an integrated disc motor, which can reduce the volume of the centrifugal pump while improving energy efficiency, reduce noise and achieve self-heating of the motor through the water flow inside the pump body. The motor is integrated into the interior of the centrifugal pump and will not leak due to long-term use of the shaft seal.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The present invention provides a self-priming multi-stage centrifugal pump with an integrated disc motor, comprising:

[0007] A shell assembly, the shell assembly comprising an outer shell, a volute and a water inlet pipe, the outer shell having a accommodating cavity, the outer shell being provided with a water inlet and a water outlet and a water injection port communicating with the accommodating cavity, the volute being fixed in the accommodating cavity, a drain port communicating with the accommodating cavity being provided on a side wall of the volute, two ends of the water inlet pipe being respectively communicated with the water inlet and one end of the volute, and a reflux port communicating with the accommodating cavity being provided on the water inlet pipe;

[0008] a rotating mechanism, the rotating mechanism comprising an impeller, the impeller being rotatably disposed in the volute; and,

[0009] The driving mechanism comprises a rotor, a stator and a winding, wherein the rotor is fixed on the impeller, the stator is fixed on the inner wall of the volute and coupled with the rotor, and the winding is wound on the stator.

[0010] In some embodiments, the outer shell includes a left shell, a middle shell, and a right shell that are detachably connected in sequence, the water inlet is opened in the left shell, and the volute is fixed to the middle shell.

[0011] In some embodiments, the left shell, the middle shell and the right shell are respectively provided with a coaxial first fixing hole, a second fixing hole and a third fixing hole, and the shell assembly also includes a long screw and a first fixing nut and a second fixing nut, the long screw passes through the first fixing hole, the second fixing hole and the third fixing hole in sequence, the first fixing nut and the second fixing nut are respectively threadedly mounted on both ends of the long screw and respectively abut against the left shell and the right shell.

[0012] In some embodiments, the left shell and the middle shell are fixedly connected via a plurality of first bolts, and the middle shell and the right shell are fixedly connected via a plurality of second bolts.

[0013] In some embodiments, the shell assembly further includes a lifting ear, one end of which is fixed to the middle shell, and the other end of which is fixedly connected to the volute.

[0014] In some embodiments, the water injection port is a threaded water injection port, and the shell assembly further includes a first plug body, which is threadedly inserted into the water injection port.

[0015] In some embodiments, the rotating mechanism further includes a bearing, an inner ring of the bearing is fixedly sleeved on the impeller, and an outer ring of the bearing is fixed on the inner wall of the volute.

[0016] In some embodiments, the number of the impellers is two, and the rotating mechanism further includes a guide vane, the guide vane is fixed to the middle casing, and both ends of the guide vane are respectively rotatably connected to the two impellers.

[0017] In some embodiments, the rotor includes a permanent magnet and an iron core, the permanent magnet is fixed on the impeller, and the iron core is embedded in the permanent magnet.

[0018] In some embodiments, the driving mechanism further includes a first protective layer and a second protective layer, wherein the first protective layer covers the stator, and the second protective layer covers the rotor;

[0019] The first protective layer comprises a first high thermal conductivity polymer sealing layer, a first titanium alloy sheet coating layer and a first high molecular elastic waterproof polyurea coating layer, wherein the first high thermal conductivity polymer sealing layer covers the stator, the first titanium alloy sheet coating layer covers the first high thermal conductivity polymer sealing layer, and the first high molecular elastic waterproof polyurea coating layer is coated on the first titanium alloy sheet coating layer;

[0020] The second protective layer includes a second high thermal conductivity polymer sealing layer, a second titanium alloy thin plate coating layer and a second polymer elastic waterproof polyurea coating. The second high thermal conductivity polymer sealing layer covers the rotor, the second titanium alloy thin plate coating layer is coated on the second high thermal conductivity polymer sealing layer, and the second polymer elastic waterproof polyurea coating is coated on the second titanium alloy thin plate coating layer.

[0021] Compared with the prior art, the beneficial effects of the self-priming multi-stage centrifugal pump device with an integrated disc motor provided by the present invention are: by integrating the stator and the rotor into the volute and the impeller respectively, there is no need to drive the impeller to rotate by an external motor, so the volume of the entire self-priming centrifugal pump can be reduced, and leakage between the motor shaft and the pump body can be prevented. At the same time, the stator and the rotor are arranged in the water in the volute, and the water inside the volute can be used for natural heat dissipation. At the same time, since there is no need to set up a fan for heat dissipation, noise can be reduced. Moreover, since the motor is directly driven by electricity, there is no other device to consume energy, which is more efficient and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a self-priming multi-stage centrifugal pump with an integrated disc motor provided by an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 An exploded view of a self-priming multistage centrifugal pump with an integrated disc motor;

[0024] Figure 3 yes Figure 1 Left view in;

[0025] Figure 4 yes Figure 3 Sectional view of mid-section AA;

[0026] Figure 5 yes Figure 4 Sectional view of the middle section BB;

[0027] Figure 6 yes Figure 4 A schematic diagram of the exhaust process of the first stage after the self-priming multi-stage centrifugal pump with an integrated disc motor is connected to an external water suction pipe and a water outlet pipe, and the centrifugal pump is started;

[0028] Figure 7 yes Figure 6 Schematic diagram of the process of the centrifugal pump delivering water after exhausting;

[0029] Description of reference numerals: 1-shell assembly, 11-housing, 111-accommodating chamber, 112-water inlet, 113-water outlet, 114-water injection port, 115-left shell, 1151-first fixing hole, 1152-first bolt, 116-middle shell, 1161-drain outlet, 117-right shell, 1171-third fixing hole, 1172-second bolt, 118-first plug body, 119-second plug body, 12-volute, 121-drain port, 13-water inlet pipe, 131-return port, 14-long screw, 15-first fixing nut, 16-second fixing nut, 17-lifting ear, 18-return pipe, 19-cable pipe, 2-rotating mechanism, 21-impeller, 22-bearing, 23-guide vane, 3-driving mechanism, 31-rotor, 311-permanent magnet, 32-stator, 33-winding, 4-water pumping pipe, 5-water outlet pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] See also Figure 1 , Figure 1 Schematic diagram of the structure of a self-priming multi-stage centrifugal pump with an integrated disc motor in one embodiment of the present invention. The self-priming multi-stage centrifugal pump with an integrated disc motor includes a housing assembly 1, a rotating mechanism 2 and a driving mechanism 3.

[0032] See also Figure 1-Figure 5 The shell assembly 1 includes an outer shell 11, a volute 12 and a water inlet pipe 13. The outer shell 11 has a accommodating chamber 111. The outer shell 11 is provided with a water inlet 112, a water outlet 113 and a water injection port 114 connected to the accommodating chamber 111. The volute 12 is fixed in the accommodating chamber 111. A drain port 121 connected to the accommodating chamber 111 is provided on the side wall of the volute 12. Both ends of the water inlet pipe 13 are respectively connected to the water inlet 112 and one end of the volute 12. A reflux port 131 connected to the accommodating chamber 111 is provided on the water inlet pipe 13. The other end of the volute 12 is closed.

[0033] The rotating mechanism 2 includes an impeller 21 , and the impeller 21 is rotatably disposed in the volute 12 .

[0034] The driving mechanism 3 includes a rotor 31 , a stator 32 and a winding 33 . The rotor 31 is fixed on the impeller 21 . The stator 32 is fixed on the inner wall of the volute 12 and coupled with the rotor 31 . The winding 33 is wound around the stator 32 .

[0035] When using, Figure 6 As shown, the water inlet 112 is first connected to one end of the water pumping pipe 4, the other end of the water pumping pipe 4 is connected to the water source, the water outlet 113 is connected to one end of the water outlet pipe 5, and then the water injection port 114 is opened, and water is injected into the water injection port 114. The injected water enters the water inlet pipe 13 through the reflux port 131 and then enters the volute 12. Then, the winding 33 is connected to electricity and AC is passed. After the AC is passed into the winding 33, a rotating magnetic field is generated. The rotating magnetic field acts on the rotor 31 to form a magneto-electrical rotation torque, which drives the rotor 31 to rotate. The rotor 31 drives the impeller 21 to rotate. When the impeller 21 rotates, the water in the volute 12 is thrown out under the action of centrifugal force and is discharged to the volute 12 through the drain port 121. The water is discharged into the accommodating chamber 111. If the water pressure is sufficient, it is discharged to the outlet pipe 5 through the outlet port 113. When the water pressure is not enough to discharge, the water returns to the water inlet pipe 13 through the reflux port 131, and then returns to the volute 12, and is thrown into the accommodating chamber 111 by the rotating impeller 21. This cycle continues. During the water circulation process, the air in the volute 12, the accommodating chamber 111, the water inlet pipe 13 and the water suction pipe 4 can be discharged to form a negative pressure, so that self-priming water delivery can be achieved, so that the water in the water source enters the volute 12 through the water suction pipe 4 and the water inlet pipe 13, and is then thrown into the accommodating chamber 111 by the rotating impeller 21, and then discharged to the outlet pipe 5 through the outlet port 113 (such as Figure 7 ).

[0036] The technical solution provided by the present invention can reduce the volume of the entire self-priming centrifugal pump by integrating the stator 32 and the rotor 31 into the volute 12 and the impeller 21 respectively, without the need for an external motor to drive the impeller 21 to rotate, and can also prevent leakage between the motor shaft and the pump body. At the same time, the stator 32 and the rotor 31 are arranged in the water in the volute 12, and the water inside the volute 12 can be used for natural heat dissipation. At the same time, since there is no need to use a fan for heat dissipation, noise can be reduced. Moreover, since the motor is directly driven by electricity, there is no other device to consume energy, which is more efficient and environmentally friendly.

[0037] In one embodiment, see Figure 1-Figure 4The housing 11 includes a left housing 115, a middle housing 116 and a right housing 117 which are detachably connected in sequence. The water inlet 112 is provided in the left housing 115, and the volute 12 is fixed to the middle housing 116. The left housing 115, the middle housing 116 and the right housing 117 are provided with a first coaxial fixing hole 1151, a second fixing hole and a third fixing hole 1171, respectively. The housing assembly 1 also includes a long screw 14, a first fixing nut 15 and a second fixing nut 16. The long screw 14 passes through the first fixing hole 1151, the second fixing hole and the third fixing hole 1171 in sequence. The first fixing nut 15 and the second fixing nut 16 are respectively threadedly sleeved on both ends of the long screw 14 and respectively abut against the left housing 115 and the right housing 117, so as to realize the detachable connection of the left housing 115, the middle housing 116 and the right housing 117.

[0038] In one embodiment, see Figure 1-Figure 4 The left housing 115 and the middle housing 116 are fixedly connected via a plurality of first bolts 1152, and the middle housing 116 and the right housing 117 are fixedly connected via a plurality of second bolts 1172. Thus, the fixing strength of the left housing 115, the middle housing 116 and the right housing 117 is further improved.

[0039] It should be understood that sealing rings are also provided between the left shell 115, the middle shell 116 and the right shell 117 to improve the sealing of the joints. This is a prior art and will not be described in detail.

[0040] In one embodiment, see Figure 1-Figure 4 The housing assembly 1 further includes a lifting ear 17 , one end of which is fixed to the middle housing 116 , and the other end of which is fixedly connected to the volute 12 .

[0041] In one embodiment, see Figure 1-Figure 4 The water injection port 114 is a threaded water injection port, and the shell assembly 1 also includes a first plug body 118, which is threadedly inserted into the water injection port 114. When the water injection is completed, the first plug body 118 should be screwed into the water injection port 114 to seal the water injection port 114 to prevent water from being discharged from the water injection port 114.

[0042] In one embodiment, see Figure 1-Figure 4The lower end of the middle shell 116 is also provided with a drain port 1161 connected to the accommodating chamber 111, and the drain port 1161 is a threaded drain port. The shell assembly 1 also includes a second plug body 119, and the second plug body 119 is threadedly inserted in the drain port 1161. When it is necessary to drain the sewage inside the accommodating chamber 111, the second plug body 119 is opened. After the drainage is completed, the second plug body 119 is screwed into the drain port 1161.

[0043] In one embodiment, see Figure 1-Figure 4 The housing assembly 1 further includes a reflux pipe 18 , one end of which is in communication with the reflux port 131 , and the other end of which is in communication with the accommodating chamber 111 .

[0044] In one embodiment, see Figure 1-Figure 4 The shell assembly 1 also includes a cable tube 19 and a cable. The cable tube 19 is fixed in the accommodating cavity. The cable passes through the cable tube 19. One end of the cable is electrically connected to the winding 33, and the other end of the cable is electrically connected to the controller. The controller is a power controller. The input end of the power controller is connected to a plug, and the plug is used to connect electricity. The output end of the power controller is electrically connected to the winding 33 for controlling the current in the winding 33. The power controller is a prior art and can be purchased directly on the market.

[0045] In one embodiment, see Figure 1-Figure 4 The rotating mechanism 2 also includes a bearing 22, the inner ring of the bearing 22 is fixedly sleeved on the impeller 21, and the outer ring of the bearing 22 is fixed on the inner wall of the volute 12, thereby realizing the rotating connection of the impeller 21.

[0046] In one embodiment, see Figure 1-Figure 4 The number of the impellers 21 is two, and the rotating mechanism 2 further includes a guide vane 23, which is fixed to the middle casing 116, and the two ends of the guide vane 23 are respectively rotatably connected to the two impellers 21.

[0047] In one embodiment, see Figure 1-Figure 4 The rotor 31 includes a permanent magnet 311 and an iron core. The permanent magnet 311 is fixed on the impeller, and the iron core is embedded in the permanent magnet 311.

[0048] In one embodiment, see Figure 1-Figure 4 , the driving mechanism 3 further includes a first protective layer and a second protective layer, the first protective layer covers the stator 32, and the second protective layer covers the rotor 31;

[0049] The first protective layer includes a first high thermal conductivity polymer sealing layer, a first titanium alloy sheet coating layer and a first high molecular elastic waterproof polyurea coating layer, wherein the first high thermal conductivity polymer sealing layer covers the stator 32, the first titanium alloy sheet coating layer covers the first high thermal conductivity polymer sealing layer, and the first high molecular elastic waterproof polyurea coating is coated on the first titanium alloy sheet coating layer;

[0050] The second protective layer includes a second high thermal conductivity polymer sealing layer, a second titanium alloy thin plate coating layer and a second polymer elastic waterproof polyurea coating. The second high thermal conductivity polymer sealing layer covers the rotor 31, the second titanium alloy thin plate coating layer is coated on the second high thermal conductivity polymer sealing layer, and the second polymer elastic waterproof polyurea coating is coated on the second titanium alloy thin plate coating layer.

[0051] The first protective layer and the second protective layer can not only provide waterproof protection for the stator 32 and the rotor 31 , but also dissipate heat for the stator 32 and the rotor 31 .

[0052] Preferably, the three-layer redundant watertight seal adopted by the rotor 31 and the stator 32 is firstly sealed by silicone potting glue; further, the semiconductor components and other components are arranged, fixed and connected on the frame or substrate by titanium alloy thin plates, and the wiring terminals are led out and fixed by potting with plastic insulating medium; further, polypropylene material is applied to the surface of the titanium alloy to neutralize the sealing properties of the previous layers.

[0053] In order to better understand the present invention, the following Figures 1 to 7 The technical solution of the present invention is described in detail: when used, Figure 6As shown, first connect the water inlet 112 to one end of the water pumping pipe 4, the other end of the water pumping pipe 4 is connected to the water source, connect the water outlet 113 to one end of the water outlet pipe 5, then open the water injection port 114, and inject water into the water injection port 114. The injected water enters the water inlet pipe 13 through the return pipe 18, and then enters the volute 12. Then, connect the winding 33 to electricity and pass alternating current. After the alternating current is passed into the winding 33, a rotating magnetic field is generated. The rotating magnetic field acts on the rotor 31 to form a magneto-electrical rotation torque, which drives the rotor 31 to rotate. The rotor 31 drives the impeller 21 to rotate. When the impeller 21 rotates, the water in the volute 12 is thrown out under the action of centrifugal force and discharged upward into the accommodating chamber 111 through the drain port 121. If the water pressure is sufficient, the water in the volute 12 is discharged upward into the accommodating chamber 111 through the outlet 121. The water outlet 113 is discharged to the water outlet pipe 5. When the water pressure is not enough to discharge, the water returns to the water inlet pipe 13 through the reflux pipe 18, and then returns to the volute 12, and is thrown into the accommodating chamber 111 by the rotating impeller 21, and is continuously circulated (this is the first stage of the operation process of the centrifugal pump, i.e., the exhaust stage). During the water circulation process, the air in the volute 12, the accommodating chamber 111, the water inlet pipe 13 and the water suction pipe 4 can be discharged to form a negative pressure, so that self-priming water delivery can be achieved, so that the water in the water source enters the volute 12 through the water suction pipe 4 and the water inlet pipe 13, and is then thrown into the accommodating chamber 111 by the rotating impeller 21, and then discharged to the water outlet pipe 5 through the water outlet 113 (this is the second stage of the operation process of the centrifugal pump, i.e., the water delivery stage, as shown in FIG. Figure 7 ).

[0054] The technical solution provided by the present invention can reduce the volume of the entire self-priming centrifugal pump by integrating the stator 32 and the rotor 31 into the volute 12 and the impeller 21 respectively, without the need for an external motor to drive the impeller 21 to rotate, and can also prevent leakage between the motor shaft and the pump body. At the same time, the stator 32 and the rotor 31 are arranged in the water in the volute 12, and the water inside the volute 12 can be used for natural heat dissipation. At the same time, since there is no need to use a fan for heat dissipation, noise can be reduced. Moreover, since the motor is directly driven by electricity, there is no other device to consume energy, which is more efficient and environmentally friendly.

[0055] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A self-priming multistage centrifugal pump with an integrated disc motor, characterized in that: include: A shell assembly, comprising an outer shell, a volute and a water inlet pipe, wherein the outer shell has a receiving chamber, the outer shell is provided with a water inlet, a water outlet and a water injection port connected to the receiving chamber, the volute is fixed in the receiving chamber, a water outlet connected to the receiving chamber is provided on the side wall of the volute, two ends of the water inlet pipe are respectively connected to the water inlet and one end of the volute, and a reflux port connected to the receiving chamber is provided on the water inlet pipe; A rotating mechanism, comprising an impeller, wherein the impeller is rotatably disposed in the volute; as well as, A driving mechanism, comprising a rotor, a stator and a winding, wherein the rotor is fixed to the impeller, the stator is fixed to the inner wall of the volute and coupled to the rotor, and the winding is wound around the stator; The housing comprises a left housing, a middle housing and a right housing which are detachably connected in sequence, the water inlet is opened in the left housing, and the volute is fixed to the middle housing; The left housing, the middle housing and the right housing are respectively provided with a coaxial first fixing hole, a second fixing hole and a third fixing hole, the housing assembly further comprises a long screw and a first fixing nut and a second fixing nut, the long screw passes through the first fixing hole, the second fixing hole and the third fixing hole in sequence, the first fixing nut and the second fixing nut are respectively threadedly sleeved on both ends of the long screw and abut against the left housing and the right housing respectively; The number of the impellers is two, and the rotating mechanism further includes a guide vane, the guide vane is fixed to the middle casing, and the two ends of the guide vane are respectively rotatably connected to the two impellers; The driving mechanism further includes a first protective layer and a second protective layer, wherein the first protective layer covers the stator, and the second protective layer covers the rotor; The first protective layer comprises a first high thermal conductivity polymer sealing layer, a first titanium alloy sheet coating layer and a first high molecular elastic waterproof polyurea coating layer, wherein the first high thermal conductivity polymer sealing layer covers the stator, the first titanium alloy sheet coating layer covers the first high thermal conductivity polymer sealing layer, and the first high molecular elastic waterproof polyurea coating layer is coated on the first titanium alloy sheet coating layer; The second protective layer includes a second high thermal conductivity polymer sealing layer, a second titanium alloy thin plate coating layer and a second polymer elastic waterproof polyurea coating. The second high thermal conductivity polymer sealing layer covers the rotor, the second titanium alloy thin plate coating layer is coated on the second high thermal conductivity polymer sealing layer, and the second polymer elastic waterproof polyurea coating is coated on the second titanium alloy thin plate coating layer.

2. The self-priming multi-stage centrifugal pump with an integrated disc motor according to claim 1, characterized in that: The left housing and the middle housing are fixedly connected via a plurality of first bolts, and the middle housing and the right housing are fixedly connected via a plurality of second bolts.

3. The self-priming multi-stage centrifugal pump with an integrated disc motor according to claim 1, characterized in that: The shell assembly also includes a lifting ear, one end of which is fixed to the middle shell, and the other end of which is fixedly connected to the volute.

4. The self-priming multi-stage centrifugal pump with an integrated disc motor according to claim 1, characterized in that: The water injection port is a threaded water injection port, and the shell assembly also includes a first plug body, which is threadedly inserted into the water injection port.

5. The self-priming multi-stage centrifugal pump with an integrated disc motor according to claim 1, characterized in that: The rotating mechanism further comprises a bearing, wherein an inner ring of the bearing is fixedly sleeved on the impeller, and an outer ring of the bearing is fixed on the inner side wall of the volute.

6. The self-priming multi-stage centrifugal pump with an integrated disc motor according to claim 1, characterized in that: The rotor comprises a permanent magnet and an iron core, wherein the permanent magnet is fixed on the impeller, and the iron core is embedded in the permanent magnet.

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