A multi-stage pump driven by a shielded permanent magnet high-speed motor

Abstract

The invention discloses a multistage pump driven by a shielded permanent magnet high-speed motor, comprising a suction chamber, a pump housing and an extrusion chamber connected in sequence, a motor assembly is arranged in the pump housing, the motor assembly comprises a motor housing and a rotor shaft rotatably connected in the pump housing, a rotor is connected to the middle of the rotor shaft, a spindle and a coil are arranged on the outside of the rotor, a motor housing is arranged on the outside of the spindle and the coil, a first wear-resistant sleeve and a second wear-resistant sleeve are connected to the two sides of the rotor shaft respectively, a first wear-resistant outer sleeve and a second wear-resistant outer sleeve are connected to the outside of the two wear-resistant sleeves respectively, a first friction plate and a second friction plate are connected to the side of the two wear-resistant outer sleeves away from the rotor respectively, the two friction plates are respectively installed on the friction plate seat, a pressure tank is connected to the outside of the extrusion chamber, a frequency converter is installed on the motor assembly, and a pressure gauge is respectively connected to the pressure tank and the frequency converter. The multistage pump of the invention can withstand greater pressure, improve the pump head and pump efficiency, and can realize constant pressure water supply at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of drive pumps, and in particular to a multi-stage pump driven by a shielded permanent magnet high-speed motor. Background Art

[0002] The non-negative pressure water supply equipment is a pressurized water supply unit, which is directly connected to the municipal water supply network, and supplies water in series based on the residual pressure of the municipal network to ensure that the pressure of the municipal network is not less than the set protection pressure (the set pressure must be higher than the pressure requirement of the community direct supply area, generally not less than 1.2Kg). It is a secondary pressurized water supply equipment.

[0003] An existing set of non-negative pressure water supply equipment takes up about 2 square meters of space, which is relatively large. The multi-stage pumps that can replace the non-negative pressure water supply equipment mostly adopt a dry structure. The defect of the dry structure is that it relies on sealing rings and mechanical shaft seals to seal the contact between the motor and the fluid. The pump head cannot exceed the tolerance pressure of the seal, so the head has certain limitations and is easily damaged by seal failure.

[0004] Therefore, there is an urgent need in the market for a multi-stage pump driven by a shielded permanent magnet high-speed motor that can withstand greater pressure, has a higher pump head and is smaller in size. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-stage pump driven by a shielded permanent magnet high-speed motor to solve the above-mentioned problems existing in the prior art.

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

[0007] A multistage pump driven by a shielded permanent magnet high-speed motor of the present invention comprises a suction chamber, a pump body shell and an extrusion chamber connected in sequence, a motor assembly is arranged in the pump body shell, the motor assembly comprises a motor shell and a rotor shaft rotatably connected in the pump body shell, a rotor is connected to the middle part of the rotor shaft, a spindle and a coil are arranged on the outside of the rotor, the motor shell is arranged on the outside of the spindle and the coil, a first wear-resistant sleeve and a second wear-resistant sleeve are connected to the two sides of the rotor shaft respectively, a first wear-resistant sleeve and a second wear-resistant sleeve are connected to the outside of the first wear-resistant sleeve and the second wear-resistant sleeve respectively, a first friction plate and a second friction plate are connected to the first wear-resistant sleeve and the second wear-resistant sleeve respectively on the side away from the rotor, and the first The friction plate is installed on the first friction plate seat, and the second friction plate is installed on the second friction plate seat. A universal adjustment baffle is connected to the side of the second friction plate seat away from the second friction plate. The first friction plate seat and the second friction plate seat are respectively engaged with the rotor shaft. A first bearing seat and a second bearing seat are respectively connected on the rotor shaft and located on both sides of the rotor. Spindle shielding sleeves are respectively connected to the outside of the first bearing seat and the second bearing seat. The spindle shielding sleeve and the motor housing are both filled and sealed with epoxy resin. The first impeller and the second impeller are respectively connected at both ends of the rotor shaft. A pressure tank is connected to the outside of the extrusion chamber. A frequency converter is installed on the motor assembly, and a pressure gauge is respectively connected to the pressure tank and the frequency converter.

[0008] Furthermore, a rotor shielding sleeve is provided between the rotor, the spindle and the coil.

[0009] Furthermore, a first nut is connected to the rotor shaft and located on the outer side of the first impeller, and a second nut is connected to the rotor shaft and located on the outer side of the second impeller.

[0010] Furthermore, a third nut is connected to the rotor shaft and is located on the outer side of the universal adjustment baffle.

[0011] Furthermore, an impeller suction baffle is connected to the rotor shaft and located on the inner side of the second impeller.

[0012] Furthermore, a first leakage-proof plate is provided between the side wall of the suction chamber and the first impeller, and a second leakage-proof plate is provided between the impeller suction partition and the second impeller.

[0013] Furthermore, a first sealing ring is provided at a connection between the suction chamber and the pump body shell, and a second sealing ring is provided at a connection between the extrusion chamber and the pump body shell.

[0014] Furthermore, the pressure gauge is a remote pressure gauge.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The multi-stage pump driven by the shielded permanent magnet high-speed motor of the present invention can be directly installed on the pipeline, replacing the non-negative pressure water supply equipment, effectively saving space, and the motor adopts a synchronous permanent magnet high-speed motor, the motor structure is shielded, and epoxy resin is filled between the shielding sleeve and the motor housing to form an overall seal. The fluid can directly enter the gap between the motor rotor and the stator for cooling, and can withstand greater pressure, thereby improving the pump head and pump efficiency. In addition, because the rotation speed is increased, the volume is smaller, saving material costs, and by arranging a pressure tank, a pressure gauge and a frequency converter, constant pressure water supply and non-negative pressure water supply can be achieved. The overall structural design of the present invention is compact and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the internal structure of a multi-stage pump driven by a canned permanent magnet high-speed motor of the present invention;

[0019] Figure 2 This is a schematic diagram of the external structure of a multi-stage pump driven by a shielded permanent magnet high-speed motor of the present invention.

[0020] Explanation of the accompanying drawings: 1. suction chamber; 2. pump body casing; 3. rotor shaft; 4. spindle and coil; 5. motor casing; 6. first anti-leakage plate; 7. first impeller; 8. first nut; 9. first wear-resistant sleeve; 10. first wear-resistant outer jacket; 11. first friction plate; 12. first friction plate seat; 13. first sealing ring; 14. first bearing seat; 15. spindle shielding sleeve; 16. rotor shielding sleeve; 17. epoxy resin; 18. second wear-resistant sleeve; 19. second wear-resistant outer jacket; 20. second friction plate; 21. second friction plate seat; 22. universal adjustment baffle; 23. third nut; 24. second bearing seat; 25. impeller suction partition; 26. second impeller; 27. second nut; 28. second sealing ring; 29. ​​extrusion chamber; 30. second anti-leakage plate; 31. pressure tank; 32. pressure gauge. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1 , Figure 2As shown, the multi-stage pump driven by the shielded permanent magnet high-speed motor of this embodiment includes a suction chamber 1, a pump body shell 2 and an extrusion chamber 29 connected in sequence, a motor assembly is arranged in the pump body shell 2, the motor assembly includes a motor shell 5 and a rotor shaft 3 rotatably connected in the pump body shell 2, a rotor is connected to the middle part of the rotor shaft 3, a spindle and a coil 4 are arranged on the outside of the rotor, a motor shell 5 is arranged on the outside of the spindle and the coil 4, a first wear-resistant sleeve 9 and a second wear-resistant sleeve 18 are connected to the two sides of the rotor shaft 3 respectively, a first wear-resistant sleeve 10 and a second wear-resistant sleeve 19 are connected to the outside of the first wear-resistant sleeve 9 and the second wear-resistant sleeve 18 respectively, a first wear-resistant sleeve 10 and a second wear-resistant sleeve 19 are connected to the first wear-resistant sleeve 10 and the second wear-resistant sleeve 19 away from the rotor The side is connected to the first friction plate 11 and the second friction plate 20, the first friction plate 11 is arranged It is mounted on the first friction plate seat 12, and the second friction plate 20 is mounted on the second friction plate seat 21. The side of the second friction plate seat 21 away from the second friction plate 20 is connected with a universal adjustment baffle 22. The first friction plate seat 12 and the second friction plate seat 21 are respectively engaged with the rotor shaft 3. The first bearing seat 14 and the second bearing seat 24 are respectively connected on the rotor shaft 3 and located on both sides of the rotor. The first bearing seat 14 and the second bearing seat 24 are respectively connected to the spindle shielding sleeve 15. The gap between the spindle shielding sleeve 15 and the motor housing 5 is filled and sealed with epoxy resin 17. The first impeller 7 and the second impeller 26 are respectively connected at both ends of the rotor shaft 3. The pressure tank 31 is connected to the outside of the extrusion chamber 29. A frequency converter is installed on the motor assembly. The pressure tank 32 is respectively connected to the pressure tank 31 and the frequency converter.

[0025] Optionally, a rotor shielding sleeve 16 is provided between the rotor, the spindle and the coil 4 .

[0026] In addition, a first nut 8 is connected to the rotor shaft 3 and located outside the first impeller 7, and a second nut 27 is connected to the rotor shaft 3 and located outside the second impeller 26. At the same time, a third nut 23 is connected to the rotor shaft 3 and located outside the universal adjustment baffle 22.

[0027] In another embodiment, an impeller suction baffle 25 is connected to the rotor shaft 3 and located inside the second impeller 26. In addition, a first leakage prevention plate 6 is provided between the side wall of the suction chamber 1 and the first impeller 7, and a second leakage prevention plate 30 is provided between the impeller suction baffle 25 and the second impeller 26.

[0028] On the other hand, a first sealing ring 13 is provided at the connection between the suction chamber 1 and the pump housing 2 , and a second sealing ring 28 is provided at the connection between the extrusion chamber 29 and the pump housing 2 .

[0029] The pressure tank 32 is a remote pressure tank 32 .

[0030] When the multi-stage pump driven by the shielded permanent magnet high-speed motor of the present embodiment is in use, the first impeller 7 located on the left side works to suck water into the suction chamber 1 from the left side. After the water flows in, it is discharged to the second impeller 26 located on the right side through the cavity between the motor housing 5 and the pump body housing 2, and then thrown out from the second impeller 26, and sent to the extrusion chamber 29 through the guide shell installed on the extrusion chamber 29; in this process, because a permanent magnet motor is installed in the multi-stage pump, and a frequency converter is installed on the permanent magnet motor, the pressure tank 31 is connected with the extrusion chamber 29, and the water pressure will be transmitted to the pressure tank 31 and reflected in the pressure tank 3 2, the pressure tank 32 is a remote pressure tank 32, the pressure tank 32 can transmit the pressure signal to the inverter and control the inverter, the start and stop of the water pump, and the pressure operation index of the water pump. The inverter can control the operating parameters of the motor. The function of the pressure tank 31 is to maintain pressure. For example, after turning off the faucet and not using water, if the pressure value exceeds the set value, the inverter controls the motor to stop working, and the pressure tank 31 can maintain the pressure. The inverter and the motor do not need to work, which saves energy and electricity. When water is needed, open the faucet, the pressure is released, the pressure value is less than the set pressure value, and the water pump starts to achieve constant pressure.

[0031] In the multi-stage pump driven by the shielded permanent magnet high-speed motor of the present embodiment, the left side of the pump is connected by a first wear-resistant sleeve 9 arranged on the rotor shaft 3, a first wear-resistant outer jacket 10 and a first friction plate 11 arranged on the motor housing. After the motor is running, the first wear-resistant sleeve 9 and the first wear-resistant outer jacket 10 as well as the first wear-resistant outer jacket 10 and the first friction plate 11 are frictionally connected, and there is no need to set a rolling bearing. Similarly, the right side of the pump is provided with a second wear-resistant sleeve 18, a second wear-resistant outer jacket 19 and a second friction plate 20, which is also provided with a universal adjustment baffle 22 with an arc-shaped contact surface to facilitate automatic adjustment of the flatness of the second friction plate 20, and the setting of the third nut 23 can achieve axial push.

[0032] The multi-stage pump driven by the shielded permanent magnet high-speed motor of the present invention can be directly installed on the pipeline, replacing the non-negative pressure water supply equipment, effectively saving space, and the motor adopts a synchronous permanent magnet high-speed motor, the motor structure is shielded, and epoxy resin 17 is filled between the shielding sleeve and the motor housing 5 to form an overall seal. The fluid can directly enter the gap between the motor rotor and the stator for cooling, and can withstand greater pressure, thereby improving the pump head and pump efficiency, and has a small volume. At the same time, by arranging pressure tanks 31, 32 and inverters, constant pressure water supply and non-negative pressure water supply can be achieved. The overall structural design of the present invention is compact and easy to use.

[0033] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-stage pump driven by a canned permanent magnet high-speed motor, characterized in that: It comprises a suction chamber, a pump body shell and an extrusion chamber connected in sequence, wherein a motor assembly is arranged in the pump body shell, and the motor assembly comprises a motor shell and a rotor shaft rotatably connected in the pump body shell, a rotor is connected to the middle part of the rotor shaft, a spindle and a coil are arranged on the outside of the rotor, and the motor shell is arranged on the outside of the spindle and the coil, a first wear-resistant sleeve and a second wear-resistant sleeve are connected to the two sides of the rotor shaft respectively, a first wear-resistant outer sleeve and a second wear-resistant outer sleeve are connected to the outside of the first wear-resistant sleeve and the second wear-resistant sleeve respectively, a first friction plate and a second friction plate are connected to the first wear-resistant outer sleeve and the second wear-resistant outer sleeve on the side away from the rotor respectively, the first friction plate is mounted on a first friction plate seat, the second friction plate is mounted on a second friction plate seat, and a side of the second friction plate seat away from the second friction plate A universal adjustment baffle is connected to the side, and the contact surface of the universal adjustment baffle is arc-shaped, which is convenient for automatically adjusting the flatness of the second friction plate. A third nut is connected to the rotor shaft and located on the outside of the universal adjustment baffle, and the setting of the third nut can realize axial push. The first friction plate seat and the second friction plate seat are respectively engaged with the rotor shaft, and the first bearing seat and the second bearing seat are respectively connected to the rotor shaft and located on both sides of the rotor. The first bearing seat and the second bearing seat are respectively connected to the outside of the first bearing seat and the second bearing seat, and the spindle shielding sleeve is filled and sealed with epoxy resin between the spindle shielding sleeve and the motor housing. The first and second impellers are respectively connected at both ends of the rotor shaft, and a pressure tank is connected outside the extrusion chamber. A frequency converter is installed on the motor assembly, and a pressure gauge is respectively connected to the pressure tank and the frequency converter.

2. A multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: A rotor shielding sleeve is arranged between the rotor, the spindle and the coil.

3. A multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: A first nut is connected to the rotor shaft and located on the outer side of the first impeller, and a second nut is connected to the rotor shaft and located on the outer side of the second impeller.

4. The multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: An impeller suction baffle is connected to the rotor shaft and located on the inner side of the second impeller.

5. A multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 4, characterized in that: A first leakage-proof plate is arranged between the side wall of the suction chamber and the first impeller, and a second leakage-proof plate is arranged between the impeller suction partition and the second impeller.

6. The multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: A first sealing ring is provided at the connection between the suction chamber and the pump body shell, and a second sealing ring is provided at the connection between the extrusion chamber and the pump body shell.

7. A multi-stage pump driven by a canned permanent magnet high-speed motor according to any one of claims 1 to 6, characterized in that: The pressure gauge is a remote pressure gauge.

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