An energy-saving centrifugal pump

Abstract

The present invention discloses an energy-saving centrifugal pump, belonging to the field of centrifugal pumps. An energy-saving centrifugal pump includes a pump body and a housing. An inlet and an outlet are provided on the pump body. The pump body and the housing are connected by an outer shell. An electric motor stator is fixedly connected to the inner side of the outer shell. An impeller is arranged inside the housing. One end of the impeller extends into the pump body. The outer wall of the other end of the impeller is fixedly connected with an electric motor rotor. Both sides of the impeller are respectively in contact with the pump body and the outer shell. A leakage hole communicating with the electric motor rotor is opened at one end of the impeller away from the electric motor rotor. The outer shell is hermetically connected to the pump body and the housing respectively by bolts. Moreover, the electric motor rotor and the impeller are integrally arranged, without the need for a transmission shaft for transmission, without the need for a shaft seal to seal between the pump body and the housing, and the connections between the pump body, the housing and the outer shell are all static seals, solving the possible water leakage problem of traditional centrifugal pumps.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and particularly relates to an energy-saving centrifugal pump. Background Art

[0002] A centrifugal pump refers to a pump that transports liquids by the centrifugal force generated when the impeller rotates.

[0003] In a traditional centrifugal pump, the motor rotates to drive the centrifugal pump to work. The axial length of the pump is long, and a dynamic sealing method is often used to seal between the motor and the centrifugal pump. This reduces the stability and reliability of the pump. At the same time, water leakage is likely to occur at the connection of the pump shaft between the motor and the centrifugal pump. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide an energy-saving centrifugal pump. The outer shell is hermetically connected between the pump body and the housing through bolts. The motor stator, the motor rotor, and the impeller are all arranged inside the housing. There is no need for shaft sealing between the pump body and the housing, so that the connection between the pump body and the housing is all static sealing, solving the possible water leakage problem of the traditional centrifugal pump. At the same time, the pump body and the housing are directly connected and fixed to the outer shell, so the structure is simple, disassembly and maintenance are very easy, the axial length is shorter than that of the traditional centrifugal pump, the weight is lighter, saving space and reducing economic costs.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An energy-saving centrifugal pump includes a pump body and a housing. The pump body is provided with a water inlet and a water outlet. The pump body and the housing are connected by an outer shell. The inner side of the outer shell is fixedly connected with a motor stator. An impeller is arranged inside the housing. One end of the impeller extends into the pump body. The outer wall of the other end of the impeller is fixedly connected with a motor rotor. The motor stator and the motor rotor are concentrically arranged. The two sides of the impeller are respectively in contact with the pump body and the outer shell. A leakage hole communicating with the motor rotor is opened at one end of the impeller away from the motor rotor.

[0007] As a further scheme of the present invention: A bearing sleeve is fixedly connected to the inner wall of the housing. A thrust bearing is rotatably connected to the outer wall of the bearing sleeve. The thrust bearing is connected to one end of the impeller.

[0008] As a further scheme of the present invention: A thrust ring is fixedly connected to one side of the inner wall of the housing. The thrust ring is in contact with the side walls of the bearing sleeve and the thrust bearing.

[0009] As a further scheme of the present invention: The motor rotor and the impeller are integrally formed.

[0010] As a further solution of the present invention: a driving wire box is fixedly connected to the outer wall of the housing, and the driving wire box penetrates through the outer wall of the motor stator and is electrically connected to the motor stator.

[0011] As a further solution of the present invention: mouth rings are provided at the contacts between the impeller and the pump body and the outer shell of the motor stator.

[0012] Beneficial effects of the present invention:

[0013] 1. In the present invention, the two sides of the outer shell are hermetically connected to the pump body and the housing respectively through bolts, so that the motor stator, the motor rotor and the impeller are all arranged inside the housing. There is no need for shaft seals to seal between the pump body and the housing, and the connection between the pump body and the housing is all static sealing, solving the possible water leakage problem of traditional centrifugal pumps.

[0014] 2. In the present invention, the pump body, the housing and the outer shell are connected and fixed through bolts, so the structure is simple, the disassembly and maintenance are convenient. The motor rotor and the impeller are integrally arranged, and there is no need for a transmission shaft for transmission, making the axial length shorter than that of traditional centrifugal pumps, lighter in weight, saving space and reducing economic costs.

[0015] 3. In the present invention, water flows circulate between the motor stator, the bearing sleeve, the motor rotor and the leakage holes, reducing the heat dissipation problem during the operation of the centrifugal pump and improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 is the overall sectional structure schematic diagram of the present invention;

[0018] Figure 2 is the schematic diagram of the impeller structure in the present invention Figure 1 ;

[0019] Figure 3 is the schematic diagram of the impeller structure in the present invention Figure 2 。

[0020] In the figure: 1. Pump body; 101. Water inlet; 102. Water outlet; 2. Housing; 201. Thrust ring; 3. Outer shell; 301. Motor stator; 302. Driving wire box; 4. Bearing sleeve; 5. Thrust bearing; 6. Impeller; 601. Leakage hole; 7. Motor rotor; 8. Mouth ring. DETAILED DESCRIPTION OF THE INVENTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figures 1 - 3 shown, an energy-saving centrifugal pump includes a pump body 1 and a housing 2. An inlet 101 and an outlet 102 are provided on the pump body 1. The inlet 101 is located on one side of the pump body 1, and the outlet 102 is located on the upper side of the pump body 1. Both sides of the outer shell 3 are fixed to the outside of the pump body 1 and the housing 2 by bolts to seal the inside of the pump body 1 and the housing 2. A motor stator 301 is fixedly connected to the inner side of the outer shell 3. An impeller 6 is arranged inside the housing 2. One end of the impeller 6 extends into the pump body 1 and one side of the impeller 6 is in contact with the inner wall of the pump body 1. The other side of the impeller 6 is in contact with the outer wall of the motor stator 301. One end of the impeller 6 away from the pump body 1 is fixedly connected to a motor rotor 7. The motor rotor 7 and the impeller 6 are integrally formed, and the motor stator 301 and the motor rotor 7 are concentrically arranged to drive the motor rotor 7 to rotate. A drive wire box 302 is fixedly connected to the outer wall of the outer shell 3. The drive wire box 302 penetrates the outer shell 3 and is electrically connected to the motor stator 301. A leakage hole 601 communicating with the motor rotor 7 is provided at one end of the impeller 6 away from the motor rotor 7.

[0023] As Figure 1 shown, a bearing sleeve 4 is fixedly connected to the inner wall of the housing 2. A thrust bearing 5 is rotatably connected to the outer wall of the bearing sleeve 4. The thrust bearing 5 is connected to the inner wall of the impeller 6 to improve the smoothness and stability of the rotation of the motor rotor 7.

[0024] As Figure 1 shown, a thrust ring 201 is fixedly connected to the inner wall of the housing 2. The thrust ring 201 is in contact with the bearing sleeve 4 and the thrust bearing 5 to reduce the friction between the rotation of the bearing sleeve 4 and the thrust bearing 5 and the housing 2.

[0025] As Figure 1 shown, mouth rings 8 are provided at the contact positions of the impeller 6 with the pump body 1 and the outer shell 3. When the motor rotor 7 rotates, friction will occur between the motor rotor 7 and the pump body 1 and the outer shell 3. The mouth rings 8 are used to reduce frictional damage.

[0026] In the present invention, both sides of the outer shell 3 are hermetically connected to the housing 2 and the pump body 1 respectively through bolts, and the motor rotor 7 and the impeller 6 are integrally arranged, reducing the transmission distance of the transmission shaft, improving the rotational stability of the impeller 6. At the same time, there is no need for shaft sealing between the pump body 1 and the housing 2, so that the connections between the pump body 1 and the housing 2 and the outer shell 3 are all static seals, solving the possible water leakage problem at the connection between the traditional centrifugal pump and the motor; and the motor rotor 7 and the impeller 6 are integrally arranged, without the need for a transmission shaft for transmission, with a simple structure, convenient disassembly and maintenance, making the axial length shorter than that of the traditional centrifugal pump, lighter in weight, saving space and reducing the economic cost.

[0027] The working principle of the present invention: The motor stator 301 is powered by the drive wire box 302, the motor stator 301 drives the motor rotor 7 to rotate, the motor rotor 7 drives the impeller 6 to rotate, and the impeller 6 drives the water entering the pump body 1 through the water inlet 101 to rotate at an accelerated speed. The water enters the motor stator 301 part through the gap between the impeller 6 and the housing 2 to cool the motor stator 301, and then the water flow enters the inside of the motor rotor 7 through the bearing sleeve 4, while cooling the motor rotor 7, the bearing sleeve 4 and the thrust bearing 5, and then returns to the inside of the pump body 1 again through the leakage hole 601 on the impeller 6. By circulating the water flow among the motor stator 301, the bearing sleeve 4, the motor rotor 7 and the leakage hole 601, the problem of heat dissipation during the operation of the centrifugal pump is reduced, and the heat dissipation effect is improved.

[0028] The above has described a specific embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An energy-saving centrifugal pump, comprising a pump body (1) and a housing (2). The pump body (1) is provided with a water inlet (101) and a water outlet (102). It is characterized in that the pump body (1) and the housing (2) are connected by an outer shell (3). The inner side of the outer shell (3) is fixedly connected with a motor stator (301). An impeller (6) is arranged inside the outer shell (3). One end of the impeller (6) extends into the pump body (1). The outer wall of the other end of the impeller (6) is fixedly connected with a motor rotor (7). The motor stator (301) and the motor rotor (7) are concentrically arranged. Both sides of the impeller (6) are in contact with the pump body (1) and the outer shell (3) respectively. A leakage hole (601) communicating with the motor rotor (7) is formed at one end of the impeller (6) away from the motor rotor (7). The middle part of the housing (2) is recessed towards the impeller to form an impeller support part. The outer wall of the impeller support part is fixedly connected with a bearing sleeve (4). A thrust bearing (5) is rotatably connected to the outer wall of the bearing sleeve (4). The outer wall of the thrust bearing (5) is connected to the inner wall of the right side of the impeller (6). The impeller support part is fixedly connected with a thrust ring (201). The thrust ring (201) is in contact with the side walls of the bearing sleeve (4) and the thrust bearing (5).

2. The energy-saving centrifugal pump according to claim 1, It is characterized in that the motor rotor (7) and the impeller (6) are integrally formed.

3. The energy-saving centrifugal pump according to claim 1, It is characterized in that a driving wire box (302) is fixedly connected to the outer wall of the housing (2). The driving wire box (302) penetrates through the outer wall of the motor stator (301) and is electrically connected to the motor stator (301).

4. The energy-saving centrifugal pump according to claim 1, It is characterized in that gland rings (8) are arranged at the contact positions between the impeller (6) and the pump body (1) and the outer shell (3).

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