Internal circulation insulating oil cooling pump

Abstract

The utility model relates to the technical field of circulating pumps, in particular to an internal circulation insulating oil cooling pump. Comprising a motor and a pump head, the motor comprises a shell, a stator and a rotor are arranged in the shell, the two ends of the rotor are supported through a shell rear end cover and a bearing on a shell front end bearing seat respectively, the front end of the rotor penetrates out of the bearing seat to be connected with an impeller in the pump head, and an insulating oil inlet and an insulating oil outlet are formed in the pump head. A cooling cavity is formed in the shell, a plurality of internal cooling inlets communicated with the cooling cavity are formed in the bearing seat, a cooling backflow channel is formed in the side wall of the shell, one end of the cooling backflow channel is communicated with the cooling cavity, and the other end of the cooling backflow channel is communicated with the insulating oil inlet. Electric appliance insulating oil enters the cooling cavity through the internal cooling inlet in the bearing seat to cool the stator, the rotor and the bearing, and meanwhile, the bearing can be lubricated, so that the stator, the rotor and the bearing are well protected, and the normal work and the service life of the circulating pump are ensured.

Description

Technical field:

[0001] The utility model relates to the technical field of circulating pumps, in particular to an internal circulating insulating oil cooling pump. Background technology:

[0002] At present, the heat generated during the operation of the transformer causes the oil near the core and winding to expand and rise due to the heat. Through the up and down convection of the transformer oil, the heat is dissipated through the radiator to ensure the normal operation of the transformer. The function of the transformer oil is mainly to insulate and dissipate heat. Transformer oil is an electrical insulating oil with a much higher insulation strength than air. When in use, the transformer oil needs to be pressurized by a circulating pump to provide power for the circulation of the transformer oil. The existing circulating pump also needs to be cooled when working. Now it is generally set up with external air cooling or a water cooling channel in the shell. Although it can play a certain cooling role, the cooling effect is poor. The internal heat of the motor of the circulating pump is not easy to dissipate. When working for a long time, it is easy to cause the internal bearing to overheat and shut down due to untimely heat dissipation, thereby affecting the normal operation and service life of the circulating pump.

[0003] In summary, the cooling problem of the circulating pump during the circulation and pressurization process of electrical insulating oil has become a technical problem that urgently needs to be solved in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides an internal circulation insulating oil cooling pump, which solves the problem of poor cooling effect of the previous circulation pumps provided with external air cooling or water cooling channels in the shell.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An internal circulation insulating oil cooling pump comprises a motor and a pump head, wherein the motor comprises a shell, a stator and a rotor are arranged in the shell, two ends of the rotor are supported by bearings on a rear end cover of the shell and a front end bearing seat of the shell respectively, the front end of the rotor passes through the bearing seat and is connected to an impeller in the pump head, an insulating oil inlet and an insulating oil outlet are arranged on the pump head, a cooling cavity is arranged in the shell, a plurality of internal cooling inlets connected to the cooling cavity are arranged on the bearing seat, a cooling reflux channel is arranged in the side wall of the shell, one end of the cooling reflux channel is connected to the cooling cavity, and the other end is connected to the insulating oil inlet.

[0007] The impeller and the rotor are locked and fixed by a fastening nut.

[0008] A first sealing ring is arranged between the shell and the pump head.

[0009] The shell and the pump head are connected via a plurality of fastening bolts.

[0010] One side of the housing is provided with a junction box, and a second sealing ring is provided between the junction box and the housing.

[0011] A process plug is provided at the connection between the cooling cavity and the cooling return channel on the housing.

[0012] The utility model adopts the above scheme and has the following advantages:

[0013] By providing a cooling cavity inside the housing, several internal cooling inlets connected to the cooling cavity are provided on the bearing seat, and a cooling return channel is provided inside the side wall of the housing. The electrical insulating oil entering the pump head from the insulating oil inlet is, on the one hand, discharged from the insulating oil outlet after being pressurized by the impeller, and on the other hand, enters the cooling cavity through the internal cooling inlet on the bearing seat to cool the stator, rotor and bearings, and at the same time can lubricate the bearings, and then returns to the insulating oil inlet through the cooling return channel to continue circulating. Due to the insulating and heat dissipation characteristics of the electrical insulating oil, it will not only not affect the normal operation of the motor, but also can take away the heat inside the motor faster, with good cooling effect, and play a good protective role for the stator, rotor and bearings, ensuring the normal operation and service life of the circulation pump. Description of the drawings:

[0014] Figure 1 It is a schematic cross-sectional structure diagram of the utility model.

[0015] In the figure, 1. housing, 2. stator, 3. rotor, 4. bearing seat, 5. bearing, 6. pump head, 7. impeller, 8. insulating oil inlet, 9. insulating oil outlet, 10. cooling cavity, 11. internal cooling inlet, 12. cooling return channel, 13. fastening nut, 14. first sealing ring, 15. fastening bolt, 16. junction box, 17. second sealing ring, 18. process plug. Specific implementation manners:

[0016] To clearly illustrate the technical features of this solution, the utility model will be elaborated in detail below through specific implementation manners and in conjunction with its drawings.

[0017] As Figure 1 shown, an internal circulating insulating oil cooling pump includes a motor and a pump head. The motor includes a housing 1, a stator 2 and a rotor 3 are provided inside the housing 1. Both ends of the rotor 3 are supported by bearings 5 on the rear end cover of the housing 1 and the front bearing seat 4 of the housing 1 respectively. The front end of the rotor 3 passes through the bearing seat 4 and is connected to the impeller 7 inside the pump head 6. The pump head 6 is provided with an insulating oil inlet 8 and an insulating oil outlet 9. A cooling cavity 10 is provided inside the housing 1. Several internal cooling inlets 11 connected to the cooling cavity 10 are provided on the bearing seat 4. A cooling return channel 12 is provided inside the side wall of the housing 1. One end of the cooling return channel 12 is connected to the cooling cavity 10, and the other end is connected to the insulating oil inlet 8.

[0018] The impeller 7 and the rotor 3 are locked and fixed through a fastening nut 13.

[0019] A first sealing ring 14 is provided between the housing 1 and the pump head 6, which can prevent the electrical insulating oil from leaking out through the gap between the housing 1 and the pump head 6.

[0020] The housing 1 and the pump head 6 are connected by a plurality of fastening bolts 15.

[0021] A junction box 16 is provided on one side of the housing 1, and a second sealing ring 17 is provided between the junction box 16 and the housing 1, which can prevent the electrical insulating oil from leaking out through the gap between the housing 1 and the junction box 16.

[0022] A process plug 18 is provided at the connection between the cooling cavity 10 and the cooling return passage 12 on the housing 1 to facilitate processing.

[0023] Working principle:

[0024] During operation, when the motor starts, the rotor 3 drives the impeller 7 to rotate at a high speed. The electrical insulating oil enters the pump head 6 from the insulating oil inlet 8. On the one hand, after being pressurized by the impeller 7, it is discharged from the insulating oil outlet 9 for use in circulating heat dissipation of electrical components such as transformers. The present utility model is not limited to use in transformers, and can be used for any electrical components that require the use of electrical insulating oil. On the other hand, the electrical insulating oil in the pump head 6 enters the cooling cavity 10 through the internal cooling inlet 11 on the bearing housing 4 to cool the stator 2, rotor 3 and bearing 5, and can also lubricate the bearing 5. Then it returns to the insulating oil inlet 8 through the cooling return passage 12 to continue circulating. Since the electrical insulating oil enters the cooling cavity 10 after being pressurized by the impeller 7, the oil pressure in the cooling cavity 10 is higher than the oil pressure at the insulating oil inlet 8. Therefore, the situation that the electrical insulating oil flows back from the cooling return passage 12 into the cooling cavity 10 will not occur, ensuring the normal circulation of the electrical insulating oil in the motor. Due to the insulating and heat dissipation characteristics of the electrical insulating oil, it will not only not affect the normal operation of the motor, but also can take away the internal heat of the motor faster, with good cooling effect, playing a good protective role for the stator 2, rotor 3 and bearing 5, and ensuring the normal operation and service life of the circulating pump.

[0025] The above specific embodiments cannot be used as a limitation to the protection scope of the present utility model. For those skilled in the art of this technology, any alternative improvement or transformation made to the embodiments of the present utility model falls within the protection scope of the present utility model.

[0026] The parts not detailed in the present utility model are all well-known technologies to those skilled in the art of this technology.

Claims

1. An internal circulation insulating oil cooling pump, characterized in that: It includes a motor and a pump head. The motor includes a housing. Inside the housing, there is a stator and a rotor. Both ends of the rotor are supported by bearings on the rear end cover of the housing and the front end bearing seat of the housing respectively. The front end of the rotor passes through the bearing seat and is connected to the impeller inside the pump head. The pump head is provided with an insulating oil inlet and an insulating oil outlet. Inside the housing, there is a cooling cavity. The bearing seat is provided with several internal cooling inlets communicating with the cooling cavity. Inside the side wall of the housing, there is a cooling return channel. One end of the cooling return channel communicates with the cooling cavity, and the other end communicates with the insulating oil inlet.

2. The internal circulation insulating oil cooling pump according to claim 1, wherein: The impeller and the rotor are locked and fixed through a fastening nut.

3. The internal circulation insulating oil cooling pump according to claim 1, characterized in that: A first sealing ring is provided between the housing and the pump head.

4. The internal circulation insulating oil cooling pump according to claim 1, characterized in that: The housing and the pump head are connected through several fastening bolts.

5. An internal circulation insulating oil cooling pump according to claim 1, characterized in that: A junction box is provided on one side of the housing. A second sealing ring is provided between the junction box and the housing.

6. The internal circulation insulating oil cooling pump according to claim 1, characterized in that: A process plug is provided on the housing at the connection between the cooling cavity and the cooling return channel.

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