Dry stator built-in rotor pump

Abstract

A rotor pump with a built-in dry stator comprises a water inlet guide vane body and a water outlet guide vane body of a through-flow vane rotor pump, and a motor cavity, a wiring chamber and a wire outlet chamber which share the same pump shaft are sequentially arranged between the water inlet guide vane body and the water outlet guide vane body. A motor stator, a motor rotor assembly and a motor winding wire formed by penetrating dry type insulation winding wires in a stator groove are arranged in the motor cavity, a hub is arranged on the outer side of the motor rotor assembly, water pump blades are installed on the hub according to the required angle of flow lift, and two rotor rotating supports are arranged on the two sides of the hub respectively. The other end of each rotor rotating support is connected with a bearing assembly which is connected to the pump shaft. The hub, the rotor rotating support, the junction box and other water pump components are used for sealing the motor cavity, it is guaranteed that the motor cavity is dry, rotating resistance and friction force of the stator and the rotor in water are reduced, and efficiency is improved by about 80%; the stator in the closed motor cavity is a dry-type stator, and a special water-resistant insulating winding wire is not needed any more, so that the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vane pumps, and particularly to a dry stator internal rotor pump. Background Art

[0002] A vane pump is a machine that converts the mechanical energy of a prime mover into liquid energy by the high-speed rotation of vanes. Vane pumps are further divided into centrifugal pumps, axial pumps, and mixed-flow pumps, which are applied in various fields. In the fields of flood control and drainage and large pumping stations, axial and mixed-flow pumps are mainly used. With the development of technology, at present, a wet stator tubular pump has emerged in the market to replace axial and mixed-flow pumps. This wet stator tubular pump combines the motor and the water pump into one. The stator and rotor can operate in water and are recognized as wet stators. Its inlet and outlet water flow channels are on a straight line, approximately straight cylindrical, with less hydraulic loss, compact structure, and simple pumping station engineering. However, this type also has the following drawbacks:

[0003] 1. The wet stator tubular pump combines the motor and the water pump into one, making the stator and rotor operate in water. This wet operation will inevitably increase the rotational resistance and friction of water during the operation of the stator and rotor. After repeated tests, it is found that the performance curve of the water pump in the most efficient area has a reduced maximum efficiency value.

[0004] 2. The wet stator of the tubular submersible pump requires water-resistant insulating winding wires. These wires need to be immersed in water for a long time. For this tubular pump, there is a water flow gap required between the two end guide bodies and the motor barrel wall in terms of structure, but this also causes hydraulic loss of the water pump. Coupled with what is described in item 1 above, the maximum efficiency of the tubular pump can only reach about 60% of the required efficiency, far less efficient than that of an axial flow pump.

[0005] 3. Due to the particularity of the wet stator motor, compared with dry motors and ordinary submersible motors, the application environment is special and the operating environment requirements are strict. If the water quality of the use environment is poor with a lot of debris or the water quality is corrosive, a long soaking time will shorten the service life of the water pump. Summary of the Invention

[0006] The present invention aims to solve the deficiencies of the prior art and provides a dry stator internal rotor pump, which seals the stator and rotor inside the motor cavity, keeps the motor cavity sealed and dry, reduces the cost of the equipment, and extends the service life of the water pump.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A dry stator built-in rotor pump includes an inlet guide vane body and an outlet guide vane body of a tubular vane rotor pump. An electric motor cavity coaxial with the pump shaft, a wiring chamber, and an outlet line chamber are sequentially arranged between the inlet guide vane body and the outlet guide vane body. The electric motor cavity includes an electric motor stator, an electric motor rotor assembly, and an electric motor winding wire formed by threading dry insulating winding wires in stator slots. The electric motor rotor assembly is externally disposed around the electric motor stator. A hub is arranged on the outer side of the electric motor rotor assembly. Water pump vanes are installed on the hub at an angle according to the requirements of flow rate and head. The two sides of the hub are respectively connected to a rotor rotating bracket I and a rotor rotating bracket II. The other ends of the two rotor rotating brackets are both connected to a bearing assembly. The bearing assembly is connected to the pump shaft. One end of the pump shaft is fixed in a flow guiding cap of the inlet guide vane body. The other end of the pump shaft is sleeved into a shaft collar sleeve and fixed in the wiring chamber. The lead-out wire of the electric motor winding wire passes through a shaft collar sleeve outlet hole on the shaft collar sleeve and enters the wiring chamber. A wiring chamber guide vane is arranged in the wiring chamber. A wiring chamber gland is arranged between the wiring chamber and the outlet line chamber. A lead-out wire joint is arranged on the wiring chamber gland. Outlet line chamber guide vanes are arranged on the inner wall of the outlet line chamber. Guide vane outlet holes are opened on the outlet line chamber guide vanes. The port of the outlet line chamber is connected to an outlet line chamber gland.

[0009] The outer wall of the electric motor stator is closely adjacent to the inner wall of the electric motor rotor assembly.

[0010] Bearing assemblies are arranged at both ends of the electric motor rotor assembly on the pump shaft in the electric motor cavity, and a mechanical seal is respectively arranged on both sides of each bearing assembly. The four mechanical seals enclose the hub, the bearing assemblies at both ends, the rotor rotating bracket I, the rotor rotating bracket II, and the junction box into a dry electric motor inner cavity.

[0011] One end of the pump shaft is fixed in the flow guiding cap by a shaft key I, the middle of the pump shaft is fixed at the central position of the electric motor stator by a shaft key II, and the other end of the pump shaft is sleeved into a shaft collar sleeve and fixed in the wiring chamber with a sealed gap by a gland.

[0012] The two ends of the bearing assembly in the flow guiding cap are respectively installed and composed of a mechanical seal I and a mechanical seal II, and the two ends of the bearing assembly in the shaft collar sleeve are respectively installed and composed of a mechanical seal III and a mechanical seal IV.

[0013] Outlet guide vanes are arranged in the outlet guide vane body.

[0014] A cable seal is installed at the outlet position of the lead-out wire on the outlet line chamber guide vane outlet hole.

[0015] The inlet guide vane body, the electric motor cavity, the wiring chamber, the outlet line chamber, and the outlet guide vane body are connected by connecting bolts.

[0016] The beneficial effects of the present invention are as follows: The present invention uses water pump components such as a hub, a rotor rotating bracket, and a junction box to seal the motor cavity, ensuring the dryness of the motor cavity, reducing the rotational resistance and friction of the stator and rotor in water, and increasing the efficiency to about 80%. In the sealed motor cavity, the stator is a dry-type stator, and there is no longer a need for special water-resistant insulating winding wires, reducing the manufacturing cost. After the motor cavity is sealed, it no longer operates in water for a long time, increasing the service life of components such as bearings and extending the service life of the water pump. The integrated design of the motor and the water pump improves the structure of the motor and increases the operating stability of the water pump. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic cross-sectional structural diagram of the shaft collar sleeve of the present invention;

[0019] In the figure: 1 - inlet guide vane body; 2 - inlet guide vane; 3 - mechanical seal I; 4 - bearing assembly; 5 - rotor rotating bracket I; 6 - motor winding wire; 7 - hub; 8 - water pump blade; 9 - rotor rotating bracket II; 10 - pump shaft; 11 - junction chamber guide vane; 12 - junction chamber; 13 - junction chamber gland; 14 - cable seal; 15 - guide vane outlet hole; 16 - outlet chamber gland; 17 - outlet guide vane; 18 - outlet guide vane body; 19 - shaft key I; 20 - flow guide cap; 21 - mechanical seal II; 22 - motor rotor assembly; 23 - motor rotor assembly; 24 - shaft key II; 25 - mechanical seal III; 26 - shaft collar sleeve; 27 - shaft collar sleeve outlet hole; 28 - mechanical seal IV; 29 - oil seal; 30 - lead wire; 31 - outlet chamber guide vane; 32 - outlet chamber; 33 - lead wire joint; 34 - motor cavity;

[0020] The following will describe in detail with reference to the accompanying drawings in combination with the embodiments of the invention. Detailed Embodiments

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0022] As Figure 1 - Figure 2As shown in the figure, a dry stator built-in rotor pump includes an inlet guide vane body 1 and an outlet guide vane body 18 of a tubular vane rotor pump. Between the inlet guide vane body 1 and the outlet guide vane body 18, a motor cavity 34, a wiring chamber 12, and an outlet chamber 32 of the same pump shaft 10 are arranged in sequence. The motor cavity 34 includes a motor stator 23, a motor rotor assembly 22, and a motor winding wire 6 formed by threading dry insulation winding wires in the stator slots. The motor rotor assembly 22 is externally disposed around the motor stator 23. A hub 7 is arranged on the outer side of the motor rotor assembly 22. Water pump vanes 8 are installed on the hub 7 at an angle according to the requirements of flow rate and head. The two sides of the hub 7 are respectively connected to a rotor rotating bracket I 5 and a rotor rotating bracket II 9. The other ends of the two rotor rotating brackets are both connected to a bearing assembly 4. The bearing assembly 4 is connected to the pump shaft 10. One end of the pump shaft 10 is fixed in the guide cap 20 of the inlet guide vane body 1. The other end of the pump shaft 10 is sleeved into a collar sleeve 26 and fixed in the wiring chamber 12. The lead wire 30 of the motor winding wire 6 passes through the collar sleeve outlet hole 27 on the collar sleeve 26 and enters the wiring chamber 12. A wiring chamber guide vane 11 is arranged in the wiring chamber 12. A wiring chamber gland 13 is arranged between the wiring chamber 12 and the outlet chamber 32. A lead wire connector 33 is arranged on the wiring chamber gland 13. An outlet chamber guide vane 31 is arranged on the inner wall of the outlet chamber 32. A guide vane outlet hole 15 is opened on the outlet chamber guide vane 31. The port of the outlet chamber 32 is connected to an outlet chamber gland 16. Cable outlet mode: The lead wire 30 of the dry motor winding wire 6 in the motor stator 23 passes through the collar sleeve outlet hole 27 in the collar sleeve 26, enters the wiring chamber 12 and the lead wire connector 33, then passes through the wiring chamber gland 13 and enters the outlet chamber 32, and is led out of the water pump by the outlet chamber guide vane outlet hole 15, and a cable seal 14 is installed at the outlet position.

[0023] The outer wall of the motor stator 23 is closely adjacent to the inner wall of the motor rotor assembly 22.

[0024] On the pump shaft 10 in the motor cavity 34, bearing assemblies 4 are arranged at both ends of the motor rotor assembly 22, and a mechanical seal 3 is arranged on each side of each bearing assembly 4. The four mechanical seals 3 enclose the hub 7, the bearing assemblies 4 at both ends, the rotor rotating bracket I 5, the rotor rotating bracket II 9, and the junction box into a dry motor inner cavity, realizing the integration of the motor and the water pump in the tubular water pump mode and also realizing a dry stator motor.

[0025] One end of the pump shaft 10 is fixed in the guide cap 20 by a shaft key I 19, the middle of the pump shaft 10 is fixed at the central position of the motor stator 23 by a shaft key II 24, and the other end of the pump shaft 10 is sleeved into the collar sleeve 26 and fixed in the wiring chamber 12 with a gland seal 29 to seal the gap.

[0026] Both ends of the bearing assembly 4 inside the flow guiding cap 20 are respectively installed by the mechanical seal I 3 and the mechanical seal II 21, and both ends of the bearing assembly 4 inside the shaft collar 26 are respectively installed by the mechanical seal III 25 and the mechanical seal IV 28.

[0027] The inlet guide vane 2 is arranged inside the inlet guide vane body 1, and the outlet guide vane 17 is arranged inside the outlet guide vane body 18.

[0028] A cable seal 14 is installed at the outlet position of the lead wire 30 on the outlet guide vane lead wire hole 15 of the outlet chamber guide vane. The shaft collar 26 is used as the connecting wall of the bearing assembly 4 and the seal, and the lead wire 30 of the motor winding wire 6 is led out from the shaft collar outlet hole 27.

[0029] The inlet guide vane body 1, the motor chamber 34, the wiring chamber 12, the outlet chamber 32 and the outlet guide vane body 18 are connected by connecting bolts. The device adds the wiring chamber 12 and the outlet chamber 32, improves the motor structure more perfectly in the whole water pump structure, and ensures the reliability of use.

[0030] When the present invention works, the electric pump starts, and the bearing assembly 4 at both ends of the electric pump rotates. Through the rotor rotating bracket I 5 and the rotor rotating bracket 9, the hub 7 installed with the water pump blade 8 rotates, so that the motor rotor assembly 22 of the tubular turbine blade rotor pump rotates to pump the water medium. The water medium enters the inlet guide vane body 1, passes through the motor chamber 34, the wiring chamber 12, the outlet chamber 32, and is discharged from the outlet guide vane body 18. Inside the water pump, due to the mechanical seal I 3, the mechanical seal II 21, the mechanical seal III 25, the mechanical seal IV 28 and an oil seal 29, the water medium cannot enter the motor chamber 34, the wiring chamber 12 and the outlet chamber 32, so that the motor winding wire 6, the lead wire 3 and the main cable are in a dry state and are no longer immersed in water. The service life of the water pump is improved. It also reduces the frictional loss generated by the operation of the motor stator 23 and the motor rotor assembly 22 in water. The integration structure of the motor and the pump improves the efficiency of the water pump to 80%, and reduces the cost of the product. This invention realizes the effects to be achieved by the present invention and opens a new water pump structure mode on the basis of the integration structure of the motor and the pump.

[0031] In the description of the invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the 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 should not be construed as a limitation to the invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0033] In the invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0034] The invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the invention, or directly applied to other occasions without improvement, they are all within the protection scope of the invention.

Claims

1. A dry stator internal rotor pump, characterized in that: The invention comprises an inlet guide vane body (1) and an outlet guide vane body (18) of a cross-flow vane rotor pump, wherein a motor chamber (34), a wiring chamber (12) and an outlet chamber (32) which are connected to a pump shaft (10) are arranged in sequence between the inlet guide vane body (1) and the outlet guide vane body (18), wherein the motor chamber (34) comprises a motor stator (23), a motor rotor assembly (22) and a motor winding wire (6) formed by passing dry-type insulating winding wires in stator slots, wherein the motor rotor assembly (22) is externally arranged on the periphery of the motor stator (23), a wheel hub (7) is arranged on the outer side of the motor rotor assembly (22), and a water pump blade (8) is installed on the wheel hub (7) according to the required angle of flow head, and the two sides of the wheel hub (7) are respectively connected to a rotor rotating bracket I (5) and a rotor rotating bracket II (9), and the other ends of the two rotor rotating brackets are connected to a bearing assembly (4 ), a bearing assembly (4) is connected to a pump shaft (10), one end of the pump shaft (10) is fixed in a guide cap (20) of a water inlet guide vane body (1), the other end of the pump shaft (10) is inserted into a shaft ring sleeve (26) and fixed in a wiring chamber (12), a lead wire (30) of a motor winding wire (6) passes through a shaft ring sleeve lead wire hole (27) on the shaft ring sleeve (26) and enters the wiring chamber (12), a wiring chamber guide vane (11) is arranged in the wiring chamber (12), a wiring chamber gland (13) is arranged between the wiring chamber (12) and the lead wire chamber (32), a lead wire connector (33) is arranged on the wiring chamber gland (13), an lead wire guide vane (31) is arranged on the inner wall of the lead wire chamber (32), a guide vane lead wire hole (15) is provided on the lead wire guide vane (31), and a port of the lead wire chamber (32) is connected to the lead wire chamber gland (16).

2. A dry stator internal rotor pump according to claim 1, characterized in that: The outer wall of the motor stator (23) is adjacent to the inner wall of the motor rotor assembly (22).

3. A dry stator internal rotor pump according to claim 2, characterized in that: Bearing assemblies (4) are arranged on both ends of the motor rotor assembly (22) on the pump shaft (10) in the motor cavity (34), and a mechanical seal (3) is arranged on both sides of each bearing assembly (4). The four mechanical seals (3) seal the wheel hub (7), the bearing assemblies (4) at both ends, the rotor rotating bracket I (5), the rotor rotating bracket II (9) and the terminal box to form a dry motor cavity.

4. A dry stator internal rotor pump according to claim 3, characterized in that: One end of the pump shaft (10) is fixed in the guide cap (20) by a shaft key I (19), the middle of the pump shaft (10) is fixed in the center position of the motor stator (23) by a shaft key II (24), and the other end of the pump shaft (10) is inserted into a shaft ring sleeve (26) and fixed in the wiring chamber (12) to seal the gap with an oil seal (29).

5. A dry stator internal rotor pump according to claim 4, characterized in that: The two ends of the bearing assembly (4) in the guide cap (20) are respectively installed by mechanical seal I (3) and mechanical seal II (21), and the two ends of the bearing assembly (4) in the shaft ring sleeve (26) are respectively installed by mechanical seal III (25) and mechanical seal IV (28).

6. A dry stator internal rotor pump according to claim 5, characterized in that: The water inlet guide vane body (1) is provided with a water inlet guide vane (2), and the water outlet guide vane body (18) is provided with a water outlet guide vane (17).

7. A dry stator internal rotor pump according to claim 6, characterized in that: A cable seal (14) is installed on the outlet hole (15) of the outlet chamber guide vane at the outlet position of the lead-out wire (30).

8. A dry stator internal rotor pump according to claim 7, characterized in that: The water inlet guide vane body (1), the motor cavity (34), the wiring chamber (12), the outlet chamber (32) and the water outlet guide vane body (18) are connected by connecting bolts.

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