JPH0428204Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric motor having a completely closed liquid cooling section.

[Conventional technology]

Conventionally, as a liquid-cooled electric motor,
As disclosed in Publication No. 34841, (1) a rotating body consisting of a rotor and a rotating shaft integrally connected thereto is provided with a coolant circulation pipe, and a portion of the rotating shaft protrudes from the bearing; The inlet of a liquid cooler is connected to the outlet of the pipe through a circumferential shaft sealing device, and the outlet of the liquid cooler is connected to the outlet of the rotating shaft through an end shaft sealing device attached to the end of the pump and the rotating shaft. Liquid-cooled electric motor connected to the pipe inlet at the end, (2)
A coolant circulation pipe is provided in a rotating body consisting of a rotor and a rotating shaft integrally connected to the rotor, and a cooler casing with a built-in circulation fan is connected to the end of the rotating shaft that protrudes from the bearing. However, there is known a liquid-cooled electric motor having a structure in which an end shaft connected to a casing is supported by a bearing on the side opposite to the rotating shaft, and a magnet is provided outside the casing to face the fan.

[Problem that the invention attempts to solve]

However, in the case of the liquid-cooled electric motor described in (1) above, the rotating shaft protrudes long from the bearing, and the protruding portion of the rotating shaft is provided with a circumferential shaft sealing device and an end shaft sealing device. There is a problem in that the overall length of the electric motor increases, making it larger.Also, in the case of the liquid-cooled electric motor mentioned in (2) above, a large cooler casing is connected to the end of the rotating shaft, and the rotating shaft Since it is necessary to support the end shaft connected to the casing on the opposite side by a bearing, there is a problem that the entire length of the liquid-cooled electric motor becomes significantly long and the size increases.

[Purpose of the invention, structure]

The object of this invention is to provide a completely enclosed liquid-cooled electric motor that can advantageously solve the above-mentioned problems and that can efficiently cool the rotor using simple means. The gist of this is that a large number of fluid passage tubes 2 extending in the longitudinal direction of the rotor are fitted around the rotor 1 of an electric motor at intervals in the rotor circumferential direction, and a rotor supporting intermediate tube body 2 on the rotor shaft 3 is fitted around the rotor 1. A sealed cooling liquid storage hole 7 is provided within the shaft 4 and within the end shafts 5 and 6 connected to both ends thereof, and a cooling liquid is sealed in the cooling liquid storage hole 7. Axis 5, 6
A liquid passage cylinder 1 for cooling an end shaft has an annular inner peripheral liquid passage groove 8 and liquid passage holes 9 and 10 connected to each other at both ends thereof.
1 is fitted and fixed, and a connection ring 12 connecting one liquid passage hole 9 of the liquid passage cylinder 11 and the end of each liquid passage pipe 2 is fitted and fixed to the liquid passage cylinder 11, The pipe body 2 is fixed to the connecting ring body 12, and the annular liquid passage is provided with liquid passages 14 connected to the other liquid passage hole 10 of the liquid passage cylinder 11 at both ends of the casing 13 of the electric motor. The fully enclosed liquid-cooled electric motor is characterized in that a member 15 is fixed and a liquid passage hole 30 connected to the liquid passage passage 14 is provided.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

The drawing shows an embodiment of this invention, in which around the rotor 1 of a three-phase cage-type induction motor, instead of the round bar on the outer circumferential side of the rotor of a conventional cage-type induction motor, a rod is installed in the longitudinal direction of the rotor. A large number of extending liquid passage tubes 2 having a circular cross section are fitted and inserted at intervals in the circumferential direction of the rotor, and are connected to an intermediate shaft 4 for supporting the rotor in the rotor shaft 3, and end shafts 5 connected to both ends thereof. A coolant receiving hole 7 is provided in 6 and extending therethrough, and one end shaft 5
, a liquid supply hole 1 communicating with the cooling liquid storage hole 7;
6 is provided, and a sealing lid 17 is provided in the liquid supply hole 16.
are screwed and fixed, and the diameter of the middle part of the cooling liquid storage hole 7 is larger than the diameter of both ends,
Furthermore, water or other cooling liquid is sealed in the cooling liquid storage hole 7 .

An annular liquid passing member 15 having a liquid passing path 14 opening to the outer circumference and the inner circumference is fitted to both ends of the casing 13 in the electric motor, and the annular liquid passing member 15
The bearing box 18 is fitted into the outer periphery of the bearing box 18 and the annular liquid passing member 15, and the outer peripheral portions of the bearing box 18 and the annular liquid passing member 15 are fixed to the end of the casing 13 by bolts 19 that pass through them and are screwed into the casing 13. The end shafts 5 and 6 are supported by bearings 20 fitted in a bearing box 18, and a bearing box lid 21 fitted to each end shaft 5 and 6 via a seal ring is attached to the bearing box 1.
8 and fixed with bolts 22.

An annular inner peripheral liquid passage groove 8 and a large number of liquid passage holes 9 provided radially so as to communicate around one end thereof.
and a large number of liquid passage holes 10 provided radially so as to communicate around the other end of the annular inner peripheral liquid passage groove 8.
The end shaft cooling liquid passage cylinder 11 is fitted and fixed to the end shafts 5 and 6 between the end of the rotor supporting intermediate shaft 4 of the rotor shaft 3 and the bearing 20, A seal link is fitted into an annular groove provided inside both ends of the liquid passage cylinder 11, and the cylinder is closed by the annular inner peripheral liquid passage groove 8 and the outer surfaces of the end shafts 5 and 6 located inside thereof. A shaped end shaft cooling chamber 23 is configured.

The end of each liquid passage tube 2 is fixed by welding or the like to a connecting ring body 12 that has an annular liquid passage chamber 24 that opens toward the inside, and each tube body 2 is attached to the connecting ring body 12. A hole is provided to communicate the inside of the liquid passage chamber 24 with the annular liquid passage chamber 24, and the liquid passage cylinder 11 is fitted and fixed within the connecting ring body 12, and one liquid passage hole 9 in the liquid passage cylinder 11 is connected to the annular liquid passage chamber 24. It is arranged so as to communicate with the liquid passage chamber 24, and an annular groove is provided on the inner periphery of the connecting ring body 12 on both sides of the annular liquid passage chamber 24, and a seal ring is fitted into the annular groove.

A communication ring 28, which includes an inner annular groove 25, an outer annular groove 26, and a number of communication holes 27 that communicate them, connects the liquid passage cylinder 11 and the annular liquid passage member 1.
A seal ring 29 is disposed on both sides of the communication ring 28, and the other liquid passage hole 10 in the liquid passage cylinder 11 communicates with the inner annular groove 25 in the communication ring 28. At the same time, the inner end of the liquid passageway 14 in the annular liquid passage member 15 communicates with the outer annular groove 26 in the communication ring 28 .

A liquid passage hole 30 communicating with the outer end of the liquid passage passage 14 in the annular liquid passage member 15 and a water passage pipe connection screw hole 31 communicating with the liquid passage hole 30 are provided at both ends of the casing 13, and annular liquid passing member 15
An annular groove is provided on the outer circumferential surface of the liquid passageway 14 on both sides of the outer end thereof, and a seal ring is fitted into the annular groove. In addition, the joint connected to the liquid sending pipe of the circulation pump (not shown) is screwed into one screw hole 31, and the joint connected to one end of the discharge pipe is screwed into the other screw hole 31. connected,
The other end of the discharge pipe and the suction pipe of the pump are arranged in a liquid storage tank, and the cooling liquid pumped by the pump is transferred to one liquid sending path 14, one connecting ring 28, and one connecting ring 28. The liquid flows through each of the liquid passage tubes 2 through the liquid passage tube 11, one of the connection rings 12, and then the other connection ring 12, the other liquid passage tube 11, the other communication ring 28, and the other liquid passage tube 2. It circulates through the liquid feeding path 14.

When assembling the rotor 1, the fluid passage pipe 2, and the connecting ring 12, first, as shown in FIG. Fit so that it does not rotate,
The silicon steel plates are prevented from moving in the longitudinal direction of the rotor shaft by a flange integrally provided at one end of the intermediate shaft 4 and a snap spring 33 fitted and locked in an annular groove at the other end of the intermediate shaft 4. Further, a large number of inner bars 34 are driven and inserted into the group of silicon steel plates, and the end of each inner bar 34 is fixed to the communication ring 35 by welding.

Next, as shown in FIG.
After driving and inserting into the silicon steel plate group, the connecting ring body 12
Then, as shown in FIG. 8, the end of each liquid passage tube 2 is fixed to the connecting ring 12 by welding or the like.

In the case of the fully enclosed liquid-cooled electric motor of the above embodiment, the rotor 1 is cooled from its outer circumferential side by the liquid flowing through the large number of liquid passage tubes 2 provided around the rotor 1. Further, a part of the liquid sealed in the coolant storage hole 7 of the rotor shaft 3 is converted into steam by the heat of the rotor 1, and the steam is transferred to the end shaft cooling chamber 23.
is converted into a liquid by being cooled by the flowing liquid and removing latent heat, and the liquid is returned to the intermediate shaft 4 by the centrifugal force caused by the rotation of the rotor shaft 3, and the rotor 1 is moved through the intermediate shaft 4. Cool it from the inside. Furthermore, the stator 36 is cooled by the wind generated on the rotor surface by the rotation of the rotor 1.

When implementing this invention, a liquid cooling jacket may be provided in the casing 13 to cool the stator 36, and a cooling liquid may be circulated through the jacket. In addition, the end of the liquid passage pipe 2 and the connecting ring 1
As the connection structure with 2, any connection structure other than that shown in the drawings may be adopted.

[Effect of idea]

According to this invention, a large number of fluid passage tubes 2 extending in the longitudinal direction of the rotor are fitted around the rotor 1 at intervals in the circumferential direction of the rotor, so that the rotor 1 can be easily A coolant storage hole 7 that can efficiently cool the rotor from the outer circumferential side and is sealed across the rotor supporting intermediate shaft 4 of the rotor shaft 3 and the end shafts 5 and 6 connected to both ends thereof. is provided, and the cooling liquid flows through the end shaft cooling chamber 23 formed by the annular inner peripheral liquid passage groove 8 of the end shaft cooling liquid passage cylinder 11 and the outer peripheral surfaces of the end shafts 5 and 6. Therefore, due to the heat of the rotor 1, the end shafts 5 and 6
The steam generated within the shaft is cooled by the liquid flowing through the end shaft cooling chamber 23 to convert the steam into a liquid, and the liquid is returned to the intermediate shaft 4 by centrifugal force to cool the rotor 1. The rotor 1 can be cooled from the inside, and therefore the heat generated in the rotor 1 during startup and operation of the motor can be effectively cooled and removed. Since there is no need to connect a shaft seal device or cooler, the length of the liquid-cooled motor can be shortened and the liquid-cooled motor can be made smaller. Since the liquid passage tube 2 is installed in place of the rod, effects such as being able to effectively cool the rotor of the cage-type induction motor by a simple means can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, in which Fig. 1 is a vertical sectional side view of a totally enclosed liquid-cooled electric motor, Fig. 2 is a longitudinal sectional side view showing an enlarged part of the motor, and Fig. 3 is a vertical sectional side view showing an enlarged part of the motor.
The figure is a sectional view taken along the line A-A in Fig. 2, Fig. 4 is a sectional view taken along the line B-B in Fig. 2, Fig. 5 is a sectional view taken along the line C-C in Fig. 2, and Figs. 6 to 8 FIG. 2 is a longitudinal sectional side view showing the assembly order of the rotor, the liquid passage pipe body, and the connecting ring body. In the figure, 1 is a rotor, 2 is a liquid passage pipe body, and 3 is a rotor.
is a rotor shaft, 4 is an intermediate shaft for supporting the rotor, 5 and 6 are end shafts, 7 is a cooling liquid storage hole, 8 is an annular inner peripheral liquid passage hole, 9 and 10 are liquid passage holes, 11 is a liquid passage cylinder, 1
2 is a connecting ring body, 13 is a casing, 14 is a liquid passage, 15 is an annular liquid passage member, 18 is a bearing box, 20 is a bearing, 23 is an end shaft cooling chamber, 24 is an annular liquid passage chamber,
25 is an inner annular groove, 26 is an outer annular groove, 27 is a communication hole, 28 is a communication ring, and 30 is a liquid passage hole.

Claims (1)

[Scope of utility model registration request] A large number of fluid passage tubes 2 extending in the rotor longitudinal direction are fitted around the rotor 1 of the electric motor at intervals in the rotor circumferential direction, and are inserted into the rotor supporting intermediate shaft 4 of the rotor shaft 3 and at both ends thereof. A sealed cooling liquid storage hole 7 is provided in the continuous end shafts 5, 6, and a cooling liquid is sealed in the cooling liquid storage hole 7. An end shaft cooling liquid passage tube 11 having an inner peripheral liquid passage groove 8 and liquid passage holes 9 and 10 connected to both ends thereof is fitted and fixed, and one liquid passage hole 9 of the liquid passage tube 11 and one liquid passage tube 11 are fitted and fixed. A connecting ring body 12 connecting the ends of each liquid passage tube 2 is fitted and fixed to the liquid passage tube 11, and the connecting ring body 12 is fitted and fixed to the liquid passage tube 11.
The pipe body 2 is fixed to the casing 13 of the electric motor, and an annular liquid passage member 15 having a liquid passage 14 connected to the other liquid passage hole 10 of the liquid passage cylinder 11 is fixed to both ends of the casing 13 of the electric motor. At the same time, the liquid passage 14
A fully enclosed liquid-cooled electric motor characterized by being provided with a liquid passage hole 30 connected to the .