Water Pump

Abstract

The present application provides a water pump. The water pump includes a casing, a motor rotor, an impeller and an anti-disturbance bearing. The motor rotor is installed in the casing, and a pump port is provided at the first end of the casing away from the motor rotor. A pumping space connected to the pump port is also formed in the casing, and the rotating shaft of the motor rotor extends into the pumping space. The impeller is installed in the pumping space and is drivingly connected to the rotating shaft of the motor rotor. The anti-disturbance bearing is installed in the pump port at intervals with the inner wall of the pump port through a connecting structure, and a flow channel is formed between the anti-disturbance bearing and the inner wall of the pump port, and the rotating shaft of the motor rotor extends to the anti-disturbance bearing to cooperate with it. The rotating shaft of the motor rotor extends to the anti-disturbance bearing to cooperate with it, providing the most effective support for the rotating shaft at the impeller, minimizing the influence of radial stress on the rotating shaft, and reliably reducing the deflection of the shaft section at the impeller of the water pump while ensuring the inlet flow state, reducing the hydraulic excitation force, and improving the product life and reliability.

Description

Technical Field

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

[0002] Some water pumps, such as ship water pumps, usually adopt a bottom-inlet and side-outlet structure due to the limited installation space. Figure 1 As shown, the water pump includes an upper bearing 1, a motor rotor 2, a main shaft 3, a lower bearing 4, an impeller 5 and a casing 6. The motor rotor 2 of the water pump with this structure can only adopt a cantilever structure, that is, the entire motor rotor 2 is only constrained by the upper bearing 1 and the lower bearing 3, and the impeller 5 is only under the lower bearing 4, resulting in the shaft section of the impeller 5 only having a single-sided constraint.

[0003] In actual use, radial force will be generated in the impeller 5, and large deflection will be easily generated under the action of radial force, so that the impeller 5 will move eccentrically, resulting in increased vibration of the water pump, reduced service life, and serious harm to the safety of the hull. Summary of the invention

[0004] The embodiment of the present invention provides a water pump to solve the technical problem in the prior art that the impeller of the motor rotor of the water pump has no bearing, which easily causes the impeller to completely perform eccentric motion.

[0005] An embodiment of the present application provides a water pump, comprising a casing; a motor rotor, which is installed in the casing, a pump port is formed at a first end of the casing away from the motor rotor, a pumping space connected to the pump port is also formed in the casing, and the rotating shaft of the motor rotor extends into the pumping space; an impeller, which is installed in the pumping space and is drivingly connected to the rotating shaft of the motor rotor; it is characterized in that the water pump also includes: an anti-disturbance bearing, which is installed in the pump port to be isolated from the inner wall of the pump port by a connecting structure, a flow channel is formed between the anti-disturbance bearing and the inner wall of the pump port, and the rotating shaft of the motor rotor extends to the anti-disturbance bearing to cooperate with the anti-disturbance bearing.

[0006] In one embodiment, there are a plurality of connection structures, which are arranged at intervals, and a portion of the flow channel is formed between two adjacent connection structures.

[0007] In one embodiment, a plurality of connection structures are arranged at equal intervals along the radial direction of the anti-disturbance bearing.

[0008] In one embodiment, the number of connecting structures is equal to the number of blades of the impeller.

[0009] In one embodiment, the connecting structure presents a first streamline shape from outside the pump port to inside the pump port.

[0010] In one embodiment, the anti-disturbance bearing includes: a mounting sleeve connected to the inner wall of the pump port via a connecting structure; and a bearing mounted in the mounting sleeve.

[0011] In one embodiment, one end of the mounting sleeve facing the outside of the pump port has a second streamlined shape.

[0012] In one embodiment, a motor installation cavity is formed in the housing, and the motor rotor is installed in the motor installation cavity.

[0013] In one embodiment, an upper bearing and a lower bearing are respectively installed at opposite ends of the motor installation cavity, and the rotating shaft of the motor rotor is matched with the upper bearing and the lower bearing respectively.

[0014] In one embodiment, the pump port includes a water inlet and a water outlet, the water inlet is arranged at the bottom of the casing and opposite to the end of the rotating shaft of the motor rotor, the anti-disturbance bearing is installed in the water inlet, and the water outlet is arranged on the side of the casing.

[0015] In one embodiment, the water pump is a ship's water pump.

[0016] In the above embodiment, the flow channel is used for passing water, and the rotating shaft of the motor rotor extends to the anti-disturbance bearing to cooperate therewith. On the one hand, the rotating shaft at the impeller is supported, and on the other hand, the impeller, the main force-bearing component, is arranged between the anti-disturbance bearing and the motor rotor, thereby providing the most effective support for the rotating shaft at the impeller, minimizing the influence of radial stress on the rotating shaft, and reliably reducing the deflection of the shaft section at the water pump impeller while ensuring the inlet flow state, reducing the hydraulic excitation force, and improving the product life and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of a water pump in the prior art;

[0019] Figure 2 is a schematic diagram of the overall structure of an embodiment of a water pump according to the present invention;

[0020] Figure 3 yes Figure 2 A schematic diagram of the structure of a water pump viewed from above;

[0021] Figure 4 yes Figure 3 Schematic diagram of the partial cross-sectional structure of the water pump at BB. DETAILED DESCRIPTION

[0022] 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 embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0023] In order to solve the technical problem that the impeller is easily completely eccentrically moved due to the lack of bearings in the impeller of the motor rotor shaft in the prior art water pump, the present invention provides a water pump, and also provides structural support at the part where the motor rotor shaft 21 is connected to the impeller 30 to improve the anti-interference performance of the motor rotor shaft 21 at the impeller 30, and avoid the motor rotor shaft 21 bending at the impeller 30. Specifically, as Figure 2 and Figure 3 As shown, an embodiment of the water pump of the present invention includes a casing 10, a motor rotor 20, an impeller 30 and an anti-disturbance bearing 40. The motor rotor 20 is installed in the casing 10, and a pump port is formed at the first end of the casing 10 away from the motor rotor 20. A pumping space 11 connected to the pump port is also formed in the casing 10, and the rotating shaft 21 of the motor rotor 20 extends into the pumping space 11. The impeller 30 is installed in the pumping space 11 and is drivingly connected to the rotating shaft 21 of the motor rotor 20. The anti-disturbance bearing 40 is installed in the pump port in isolation from the inner wall of the pump port through a connecting structure 50, and a flow channel a is formed between the anti-disturbance bearing 40 and the inner wall of the pump port, and the rotating shaft 21 of the motor rotor 20 extends to the anti-disturbance bearing 40 to cooperate with it.

[0024] By applying the technical solution of the present invention, the flow channel a is used for passing water, and the rotating shaft 21 of the motor rotor 20 extends to the anti-disturbance bearing 40 to cooperate therewith. On the one hand, the rotating shaft 21 at the impeller 30 is supported, and on the other hand, the impeller 30, the main force-bearing component, is arranged between the anti-disturbance bearing 40 and the motor rotor 20, thereby providing the most effective support for the rotating shaft 21 at the impeller 30, minimizing the influence of radial stress on the rotating shaft 21, and reliably reducing the deflection of the shaft section at the water pump impeller while ensuring the inlet flow state, reducing the hydraulic exciting force, and improving the product life and reliability.

[0025] Optionally, the anti-disturbance bearing 40 may be a sliding bearing or a rolling bearing.

[0026] As an optional implementation, Figure 3 As shown, there are multiple connection structures 50, and the multiple connection structures 50 are arranged at intervals, and a portion of the flow channel a is formed between two adjacent connection structures 50. The multiple connection structures 50 can achieve a more effective connection to the anti-disturbance bearing 40, thereby achieving stable support for the rotating shaft 21. More preferably, the multiple connection structures 50 are arranged at equal intervals along the radial direction of the anti-disturbance bearing 40, thereby improving the effective support effect for the anti-disturbance bearing 40.

[0027] More preferably, the number of the connecting structures 50 is equal to the number of blades of the impeller 30, thereby ensuring that the inlet flow field segmentation areas and the impeller flow field segmentation areas remain consistent in number, thereby ensuring the stability of the entire water inlet flow field.

[0028] like Figure 4 As shown, as a preferred embodiment, in the technical solution of this embodiment, the connection structure 50 is a first streamlined shape from outside the pump port to inside the pump port, so as to avoid the connection structure 50 interfering with the water inlet of the pump port, making the water inlet smoother. Optionally, the connection structure 50 is a connection rib connected between the anti-disturbance bearing 40 and the inner wall of the pump port. As other optional embodiments, the connection structure 50 can also be other structural components.

[0029] As an optional implementation, Figure 2 and Figure 3 As shown, the anti-disturbance bearing 40 includes a mounting sleeve 41 and a bearing 42. The mounting sleeve 41 is connected to the inner wall of the pump port through a connecting structure 50, and the bearing 42 is installed in the mounting sleeve 41. In the technical solution of this embodiment, the mounting sleeve 41 and the bearing 42 are two parts, which are manufactured separately. As another optional embodiment, the mounting sleeve 41 and the bearing 42 can also be an integrally manufactured part. More preferably, as Figure 4 As shown, the end of the mounting sleeve 41 facing the outside of the pump port is in a second streamlined shape to prevent the anti-disturbance bearing 40 from interfering with the water inlet of the pump port, allowing the water inlet to be smoother.

[0030] like Figure 2 As shown, in the technical solution of this embodiment, a motor installation cavity 14 is formed in the housing 10, and the motor rotor 20 is installed in the motor installation cavity 14. More preferably, an upper bearing 141 and a lower bearing 142 are respectively installed at opposite ends of the motor installation cavity 14, and the rotating shaft 21 of the motor rotor 20 is matched with the upper bearing 141 and the lower bearing 142 respectively. In this way, the upper bearing 141 and the lower bearing 142 can effectively support the shaft section of the rotating shaft 21 in the motor installation cavity 14, while the lower bearing 142 and the anti-disturbance bearing 40 can effectively support the shaft section of the rotating shaft 21 in the pumping space 11. Thereby, a three-point constraint on the rotating shaft 21 is formed, and the motor rotor 20 and the impeller 30 are respectively located between the constraints, thereby minimizing the influence of radial stress on the rotating shaft 21.

[0031] Specifically, Figure 2As shown, the rotating shaft 21 runs through it, and forms a rotating system with other components assembled thereon, and performs high-speed operation of 3000 rpm under the action of electromagnetic force. When the water pump is running, a radial force acting on the impeller 30 is generated, so that the shaft section at the impeller 30 is subjected to alternating stress and produces directional deflection. The rotor system components are, from top to bottom, the upper bearing 141, the motor rotor 20, the lower bearing 142 and the impeller 30. The motor rotor 20 is in the support section of the upper bearing 141 and the lower bearing 142, and it is not easy to produce a large deflection. The impeller 30 is in the cantilever section under the lower bearing 142, which is easy to produce a large deflection. For this reason, in the technical solution of the present invention, an anti-disturbance bearing 40 is configured, and the rotating shaft 21 is extended to the anti-disturbance bearing 40, so as to add a constraint below the impeller 30, so that the entire rotating shaft 21 has three-point constraints, and the motor rotor 20 and the impeller 30 are respectively between the constraints, so as to minimize the influence of radial stress on the rotating shaft 21.

[0032] like Figure 2 As shown, optionally, the pump port includes a water inlet 12 and a water outlet 13, the water inlet 12 is arranged at the bottom of the casing 10 and opposite to the end of the rotating shaft 21 of the motor rotor 20, the anti-disturbance bearing 40 is installed in the water inlet 12, and the water outlet 13 is arranged on the side of the casing 10. In combination with the overall structure, the anti-disturbance bearing 40 is arranged at the water inlet 12, and it is integrated with the casing through the connecting structure 50. When the water pump is running, the flow state of the inlet has a great influence on its performance, vibration and hydrodynamic safety. In order to ensure a good movement state of the inlet fluid, the anti-disturbance bearing 40 and the connecting structure 50 are both designed to be streamlined.

[0033] Its contour line must conform to the following equation:

[0034] X=Y / tan[π*RY / R],Y>0

[0035] X=-R / π,Y=0

[0036] X——streamline horizontal coordinate, m;

[0037] Y——streamline ordinate, m;

[0038] R——The streamline limit radial dimension is set according to actual needs, m.

[0039] At the same time, the number Z of the connecting structures 50 needs to be equal to the number of blades of the impeller 30, so as to ensure that the inlet flow field segmentation areas and the impeller flow field segmentation areas are consistent in number, thereby ensuring the stability of the entire water inlet flow field.

[0040] It should be noted that the technical solution of the present invention is particularly suitable for marine water pumps. The technical solution of the present invention can effectively solve the problem of excessive shaft deflection at the impeller of marine water pumps and optimize the inlet flow pattern difference problem caused by adding the anti-disturbance bearing 40.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water pump, comprising Housing (10); The motor rotor (20) is installed in the casing (10); a pump port is formed at a first end of the casing (10) away from the motor rotor (20); a pumping space (11) connected to the pump port is formed in the casing (10); a rotating shaft (21) of the motor rotor (20) extends into the pumping space (11); An impeller (30) is installed in the pumping space (11) and is drivingly connected to the rotating shaft (21) of the motor rotor (20); It is characterized in that The water pump also includes: an anti-disturbance bearing (40), the anti-disturbance bearing (40) being installed in the pump port in isolation from the inner wall of the pump port via a connecting structure (50), a flow passage (a) being formed between the anti-disturbance bearing (40) and the inner wall of the pump port, and a rotating shaft (21) of the motor rotor (20) extending to the anti-disturbance bearing (40) to cooperate therewith; There are a plurality of the connection structures (50), the plurality of the connection structures (50) are arranged at intervals, and a portion of the flow passage (a) is formed between two adjacent connection structures (50); A plurality of the connection structures (50) are arranged at equal intervals along the radial direction of the anti-disturbance bearing (40); The number of the connecting structures (50) is equal to the number of blades of the impeller (30); The connection structure (50) presents a first streamline shape from outside the pump port to inside the pump port.

2. The water pump according to claim 1, characterized in that: The anti-disturbance bearing (40) comprises: A mounting sleeve (41), wherein the mounting sleeve (41) is connected to the inner wall of the pump port via the connecting structure (50); The bearing (42) is installed in the installation sleeve (41).

3. The water pump according to claim 2, characterized in that: One end of the mounting sleeve (41) facing the outside of the pump port is in a second streamline shape.

4. The water pump according to claim 1, characterized in that: A motor installation cavity (14) is formed in the housing (10), and the motor rotor (20) is installed in the motor installation cavity (14).

5. The water pump according to claim 4, characterized in that: An upper bearing (141) and a lower bearing (142) are respectively installed at opposite ends of the motor installation cavity (14), and the rotating shaft (21) of the motor rotor (20) is matched with the upper bearing (141) and the lower bearing (142) respectively.

6. The water pump according to claim 1, characterized in that: The pump port comprises a water inlet (12) and a water outlet (13); the water inlet (12) is arranged at the bottom of the housing (10) and is opposite to the end of the rotating shaft (21) of the motor rotor (20); the anti-disturbance bearing (40) is installed in the water inlet (12); and the water outlet (13) is arranged on the side of the housing (10).

7. The water pump according to claim 1, characterized in that: The water pump is a ship water pump.

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