JPH10285876A - Liquid-cooled type rotating motor with impeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide disuse of a coolant circulating pump, and labor saving with free maintenance by attaching an impeller to a hollow shaft outer periphery part on the shaft end side farther than a position where a mechanical seal is attached. SOLUTION: Coolant is put in the fluid inlet 6b of a coolant inlet pipe 6a attached to a coolant housing 6 and is discharged from a hole 8a of prescribed length formed at the central part of a hollow shaft 8. The coolant bounds at the end surface 8b of the hole, and flows reversely at a clearance 8c between the hole 8a of the hollow shaft and the outer periphery of the coolant inlet pipe 6a, so that the coolant is guided forcibly to the blade 12a part of an impeller from the opening 8d of the hole in a shaft end by action of a pump with the rotation of the impeller. The coolant is poured from a coolant outlet 6c formed at the coolant housing 6 through the inside space of the coolant housing 6 for cooling a rotor. It is thus possible to eliminate a pump which had been provided additionally for circulating coolant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid-cooled rotary electric motor,
In particular, it relates to a liquid-cooled fully-closed motor.

[0002]

2. Description of the Related Art FIG. 5 is an enlarged view of a main part of a conventional liquid-cooled rotary motor. In FIG. 5, reference numeral 1 denotes a bearing, 2 denotes a bearing housing, 3 denotes an outer cover, 4 denotes a rotation detecting gear, and 5 denotes a rotation detecting gear. The mounting base 6 is a cooling liquid box, and the cooling liquid box 6 is provided with a liquid inlet pipe 5a and a liquid discharge port 6c of a predetermined length. A conventional method of cooling a rotor (see 9 in FIG. 1) of a liquid-cooled rotary electric motor is as follows. First, a coolant is introduced from a liquid inlet 6b of a liquid inlet pipe 6a attached to a coolant box 6, and the rotor is cooled. A hole of a predetermined length (8a in FIG. 1) provided in the center of the hollow shaft
(See Reference). The coolant discharged from this hole rebounds at the end face of the hole (see 8b in FIG. 1), flows backward through the gap 8c between the hole of the hollow shaft and the outer periphery of the liquid inlet pipe 6a, and opens the hole at the shaft end. 8d is discharged into the internal space A of the cooling liquid box 6. The coolant discharged into the internal space A is supplied to the coolant box 6.
The rotor is cooled by circulating the cooling liquid flowing out from the drainage port 6c provided in the rotor.

As means for circulating the coolant, a pump (not shown) for circulating the coolant outside is conventionally used.
Is provided separately. Reference numeral 7 denotes a mechanical seal, and a hollow shaft 8 extending to a predetermined position in the internal space A of the coolant box 6 is attached to the outer periphery. The mechanical seal 7 seals the coolant to prevent leakage of the coolant. doing. Also, a small amount of coolant leaking from the mechanical seal 7 is provided with a leak reservoir 5a on the inner peripheral side of the mounting base 5, and is drained from a drain hole 5b communicating with the leak reservoir 5a. You. In such a configuration, the coolant leaked from the mechanical seal 7 does not enter the storage section of the rotation detection gear 4, the storage section of the bearing 1, and the inside B of the rotary electric motor. Next, the stator (see 10 in FIG. 1) is mounted on the frame 11, and the description of the cooling method of the stator is omitted because it does not relate to the content of the present invention.

[0004]

In the liquid-cooled rotary electric motor constructed as described above, a pump is separately provided outside as means for circulating the cooling liquid for cooling the rotor as described above. . This coolant circulation pump is
Naturally, since it is a separate product from the liquid-cooled rotary electric motor, for example, when trying to mount under the body of an electric car,
Its extra storage space is needed. Further, since the cooling liquid circulation pump generally has lower durability than the liquid-cooled rotary electric motor, a period for holding and maintaining the cooling liquid is short, which hinders labor saving. The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid-cooled rotary electric motor with an impeller, which eliminates the cooling liquid circulation pump of the above-described problem.

[0005]

Means for achieving the object are as follows: (1) A structure in which a mechanical seal is attached to the outer periphery of a non-load side shaft end of a hollow shaft having a rotor mounted thereon. In a liquid-cooled rotary electric motor, an impeller is attached to the outer periphery of the hollow shaft on the shaft end side further from the position where the mechanical seal is attached, so that the mechanical seal and the impeller are covered with a cooling liquid box ( Claim 1).

(2) The liquid-cooled rotary motor with blades is a fully-closed motor, and the liquid-cooled fully-closed motor with blades is connected to a gear device of an electric vehicle to constitute an electric vehicle. 2). Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0007]

FIG. 1 is a partial sectional view of a liquid-cooled rotary electric motor with an impeller according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG. 1. In FIG. 2, the same reference numerals in FIG. 5 denote parts having the same configuration and function. 1 and 2, 1 is a bearing, 2 is a bearing housing, 3 is an outer cover, 5 is a mounting base, 6 is a coolant box, and the coolant box 6 has an inlet pipe 6a of a predetermined length. A drain port 6c is provided. 7 is a mechanical seal, 12 is an impeller,
Both are attached to the outer peripheral portion of the shaft end on the non-load side of the hollow shaft 8 on which the rotor 9 is mounted, and the impeller 12 is attached at a position further on the shaft end side than the position where the mechanical seal 7 is attached. These are covered with a coolant box 6.

The method of cooling the rotor 9 of the liquid-cooled rotary electric motor with the impeller 12 is such that when the hollow shaft 8 on which the rotor 9 is mounted rotates, first, the liquid inlet pipe 6a attached to the coolant box 6 is cooled. The cooling liquid flows from the liquid inlet 6b and is discharged into a hole 8a of a predetermined length provided at the center of the hollow shaft 8. This hole 8
The coolant discharged to a rebounds at the end face 8b of the hole,
The gap 8c between the hole 8a of the hollow shaft and the outer periphery of the liquid inlet pipe 6a flows backward, and the blade 1 of the impeller 12 passes through the opening 8d of the hole at the shaft end.
The coolant is forcibly guided to the portion 2a by a pump action accompanying the rotation of the impeller 12. The blade 1 of the impeller 12
A plurality 2a are radially attached along the circumferential direction.

The cooling liquid forcedly guided to the blades 12a of the impeller 12 is provided in the cooling liquid box 6 via the internal space A of the cooling liquid box 6 by a centrifugal action caused by the rotation of the impeller 12. It is discharged from the drainage port 6c. Since the rotor 9 can be cooled by the means for circulating the cooling liquid by the impeller 12 as described above, in the case of the conventional liquid-cooled rotary electric motor, it is separately provided to circulate the cooling liquid to the outside. No pump is required. Reference numeral 7 denotes a mechanical seal, which is attached to the outer periphery of a hollow shaft 8 extending to a predetermined position in the internal space A of the cooling liquid box 6, and seals the cooling liquid with the mechanical seal 7 to prevent leakage of the cooling liquid. doing.

[0010] A small amount of coolant leaking from the mechanical seal is provided with a leak reservoir 5a on the inner peripheral side of the mount 5, and is drained from a drain hole 5b communicating with the leak reservoir 5a. Liquid. In such a configuration, the coolant leaked from the mechanical seal 7 does not enter the storage section of the rotation detection gear 4, the storage section of the bearing 1, and the inside B of the rotary electric motor. Next, 10 is a stator and frame 1
1 and the method of cooling the stator 10 is not easily described in the context of the present invention.

FIG. 3 is a schematic structural view of an electric vehicle drive unit according to a second embodiment of the present invention. In FIG. 3, 1
Reference numeral 3 denotes a liquid-cooled fully-closed motor with an impeller used as a main motor of an electric vehicle, 14 denotes a joint, and 15 denotes a gear device. The driving force of the liquid-cooled fully closed motor 13 with the impeller is transmitted to the gear device 15 via the joint 14. Gear device 1
The driving force transmitted to 5 is further transmitted to the wheels via the axle to drive the electric vehicle.

FIG. 4 shows the shapes of various blades of the impeller shown in FIG. 1, (a) is a side sectional view, (b) is a schematic diagram showing one example of the blade, and (c) is two examples of the blade. Schematic diagram showing
(D) is a schematic diagram showing three examples of a blade. FIG. 4 (a),
In (b), (c), and (d), the impeller 1 shown in FIG.
The second impeller 12a, as shown in FIG.
The blade 12a1 is formed radially toward the axis of the blade, the blade 12a2 is formed in a curved shape as shown in FIG. (C), or the impeller 12 is formed as shown in FIG. The blades 12a3 are formed in a direction slightly deviated toward the axis of the blade.

[0013]

As described above, according to the present invention, there is provided a liquid-cooled rotary electric motor having a structure in which a mechanical seal is attached to an outer periphery of a non-load-side shaft end of a hollow shaft having a rotor mounted thereon. By attaching the impeller to the outer periphery of the hollow shaft on the shaft end side further from the position where the seal is attached, when the hollow shaft with the rotor is rotated, the impeller attached to the hollow shaft is also the same. The rotor can be cooled by forcibly circulating the coolant by the pumping action of the centrifugal force of the impeller. For this reason,
In the case of a conventional liquid-cooled rotary electric motor, a pump separately provided for circulating the cooling liquid to the outside is not required, and the maintenance and maintenance thereof are completely eliminated, thereby enabling labor saving.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a liquid-cooled rotary electric motor with an impeller according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a schematic configuration diagram of an electric vehicle drive unit according to a second embodiment of the present invention.

FIG. 4 is a schematic view showing various shapes of a blade.

FIG. 5 is an enlarged view of a main part of a conventional liquid-cooled rotary motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing 2 Bearing housing 3 Outer cover 4 Rotation detection gear 5 Mounting stand 5a Leakage reservoir 5b Drain hole 6 Coolant box 6a Liquid inlet pipe 6b Liquid inlet 6c Drain outlet 7 Mechanical seal 8 Hollow shaft 8a hole 8b hole 8c Gap 8d Hole opening 9 Rotor 10 Stator 11 Frame 12 Impeller 12a Blade A Internal space B Inside of rotary motor 13 Liquid-cooled fully-closed motor with impeller 14 Joint 15 Gear device

Claims (2)

[Claims] 1. A liquid-cooled rotary motor having a configuration in which a mechanical seal is attached to an outer periphery of a non-load-side shaft end of a hollow shaft on which a rotor is mounted, wherein the shaft end is further extended than a position where the mechanical seal is attached. A liquid-cooled rotary electric motor with an impeller, wherein an impeller is attached to an outer peripheral portion of the hollow shaft on the side, and the mechanical seal and the impeller are covered with a cooling liquid box. 2. The electric vehicle according to claim 1, wherein the liquid-cooled rotary electric motor with the impeller is a fully-closed electric motor, and the liquid-cooled fully-closed electric motor with the impeller is connected to a gear device of the electric vehicle to constitute the electric vehicle. Liquid-cooled rotary motor with blades.