JP3000903B2 - Rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine, and more particularly, to detection of refrigerant leakage in a rotating electric machine cooled by a liquid refrigerant.

[0002]

2. Description of the Related Art In recent years, the capacity of rotating electric machines, such as generators for vehicles, has increased with the increase in on-board electric equipment, and various cooling structures for preventing heat generation have been proposed. For example, Japanese Unexamined Utility Model Publication No. 2-72658 discloses a rotary electric machine in which a cooling jacket having a spiral refrigerant flow path is provided on the outer periphery of a frame. The figure shows a case in which a steel pipe is placed on the outer periphery of the formed casting frame via an O-ring to form a coolant flow path.

[0003] However, such a cooling structure has the drawbacks that it is not easy to exchange the refrigerant and that the center of the axis of the rotating part and the center of the axis of the stator are easily shifted. In addition, the size of the rotating electric machine tends to be large, and it takes time to assemble the rotating electric machine. Therefore, in order to solve this problem, a cylindrical container body having a cylindrical shape with one end closed is fitted with the cylindrical openings facing each other to form a closed container body, and the outer periphery of the small-diameter container body is formed. A rotating electric machine having a cooling structure in which a concave groove formed in a surface is closed by an inner peripheral surface of a large-diameter container body in contact with the outer peripheral surface to form a flow path of a liquid refrigerant has been previously filed (Japanese Patent Application No. 2002-214,197). Flat 7-3
No. 5163). According to this, the problem that the shaft center of the rotating part is deviated from the shaft center of the stator is solved, and there is an excellent effect that the size of the rotating electric machine is reduced and the assembling property is improved.

[0004]

In the rotating electric machine of the present invention, an O-ring as a seal member is provided from the above-mentioned concave groove, which is a refrigerant flow passage, to the opening edge of the container body, so that the liquid refrigerant is supplied. It does not enter the rotating electrical machine. Since the O-ring may be deteriorated by long-term use, a plurality of O-rings are provided to more reliably prevent leakage of the liquid refrigerant. However, whether or not the O-ring has deteriorated cannot be known from the outside of the rotating electric machine, and the leakage of the liquid refrigerant is known only after an accident such as a short circuit actually occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating electric machine capable of reliably detecting leakage of a liquid refrigerant due to deterioration of an O-ring and preventing occurrence of an accident such as a short circuit. Aim.

[0006]

SUMMARY OF THE INVENTION A feature of the present invention is a small-diameter container (11).
Between the outer peripheral surface closer to the opening edge than the concave groove (13) and the inner peripheral surface of the large-diameter container body (12).
1, 32), and leakage of the liquid refrigerant from the refrigerant flow path (P) between the seal member (31) closest to the concave groove (13) and the seal member (32) located next to the groove. (14) for detecting the The means for detecting the leakage of the liquid refrigerant can be realized by forming a small hole (14) in the cylindrical wall of the large-diameter container (12).

In such a structure, the deterioration of the seal member is usually the fastest in contact with the liquid refrigerant, and in order for the liquid refrigerant to enter the rotary electric machine, it is essential that the seal member leaks. Therefore, if the leakage of the liquid refrigerant is detected between the seal member closest to the concave groove and the seal member adjacent thereto, it is possible to prevent intrusion into the rotating electric machine.

Further, it is simple and inexpensive to realize the means for detecting leakage of the liquid refrigerant by using small holes.

[0009]

FIG. 1 is an overall sectional view of a generator as a rotating electric machine. In the figure, a housing 1 is constituted by a pair of left and right container bodies 11 and 12. Each of the container bodies 11 and 12 has a cylindrical shape with one end closed, the front side container body 11 has a relatively small cylindrical diameter, and the outer peripheral surface of the peripheral wall has a spiral groove 13 with a constant depth in most parts. Is formed. At the outer periphery of the opening edge of the container body 11, mounting grooves 15 and 16 are formed on the entire circumference at intervals in the axial direction, and O-rings 31 and 3 are respectively formed in these mounting grooves 15 and 16.
2 are stored.

The rear-side container body 12 has a relatively large cylinder diameter, and when the cylindrical portion of the container body 11 is fitted into the container body 12 with the cylinder openings facing each other, the O-rings 31 and 32 become A closed housing 1 is formed on the inner peripheral surface of the housing 12. At this time, the cylindrical opening edge of the container body 12 is sealed by the O-ring 33 provided here. A shaft 3 is provided through front and rear end walls of the closed housing 1, and the shaft 3 is rotatably supported at both ends by bearings 41 and 42 provided at the center of each end wall. On the outer periphery of the shaft 3, a cylindrical central portion 51 of the rotor 5 is provided.
On the outer periphery of the central portion 51, a rotor core 52 in which a large number of sheet-like iron plates are stacked in the axial direction is provided, and a coil 53 is wound around the rotor core 52.

[0011] Near the outer periphery of the rotor core 52, similarly, a stator core 21 in which a large number of sheet-like iron plates are stacked in the axial direction.
The stator core 21 is press-fitted into the container body 11 from the cylindrical opening and fixed. A coil 22 is wound around the stator core 21 to form the stator 2. The rear end of the shaft 3 protrudes into the space S1 covered by the cover 17 outside the end wall of the container body 12, and a pair of slip rings 61 for supplying electricity to the rotor coil 53 are provided on the outer periphery of the protruding portion. Press-fit fixed. The tips of the brushes 62 are in contact with the respective slip rings 61. Further, a lead wire 23 extending from the stator coil 22 is connected to a rectifier 24 provided in the space S1.

Now, as described above, the container 11 is
2, the concave groove 13 on the outer peripheral surface of the container body 11 is closed with a small gap by the inner peripheral surface of the container body 12 to form a spiral flow path P of the liquid refrigerant. The refrigerant flow path P is
2 communicates with an unillustrated injection port and discharge port provided on the outer periphery, and a required amount of liquid refrigerant flows. The reason why a small gap is formed between the outer peripheral surface of the container body 11 in which the concave groove 13 is formed and the inner peripheral surface of the container body 12 is to facilitate exchange of the liquid refrigerant.

The coolant flow path P is isolated from the housing interior space S2 by the O-rings 31 and 32 provided on the outer periphery of the opening edge of the container body 11. A small hole 14 is provided in the lower surface of the cylindrical wall of the container 12, and the small hole 14 is located between the O-rings 31 and 32 in a state where the container 11 is fitted. The diameter of the small hole 14 is preferably about 3 mm. The reason is that O-ring 3
This is because it is not preferable in view of the installation intervals of the nozzles 1 and 32. On the other hand, if the diameter is small, leakage of the liquid refrigerant described later is not performed smoothly.

In the power generator having such a structure, when the shaft 3 is rotated by the driving force from the engine, the magnetic field of the rotor 5 rotating integrally therewith crosses the stator 2 to generate the generated power in the coil 22 thereof. . Although the stator coil 22 through which a large generated current flows generates heat, since the outer periphery of the stator core 21 is in contact with the refrigerant flow path P via a relatively thin cylindrical wall, the heat of the stator coil 22 is transferred to the refrigerant through the stator core 21 in the refrigerant. And excessive temperature rise is suppressed.

The refrigerant flow path P is sealed by the O-rings 31 and 32 to prevent the liquid refrigerant from entering the housing space S2. However, the O-ring 31 that directly contacts the liquid refrigerant is easily deteriorated. Often, liquid refrigerant leaks. Here, the liquid refrigerant leaked from the O-ring 31 is prevented from entering the housing space S2 by the undegraded O-ring 32, and the liquid refrigerant outside the housing 1 passes through the small hole 14 opened to reach the O-ring 32. Leaks out to

Therefore, by confirming the leakage of the liquid refrigerant from the small holes 14, it is possible to easily detect the leakage of the liquid refrigerant due to the deterioration of the O-ring 31, and to take necessary measures such as replacing the O-ring 31. Can be taken promptly. In addition, even if raindrops or the like enter through the small holes 14 in a normal use state, the O-rings 31 and 32 prevent entry into the refrigerant flow path P and the housing space S2.

The number of the small holes 14 is not limited to one, and may be provided at a plurality of positions in the circumferential direction of the container 12 between the O-rings 31 and 32. Instead of visually checking the leakage of the liquid refrigerant from the small holes 14, the leakage may be detected by various sensors. Alternatively, the leakage of the liquid refrigerant may be directly detected, for example, by inserting a detection electrode between the O-rings 31 and 32 instead of the small holes 14.

The number of O-rings is not limited to two, and three or more O-rings may be provided. In this case, a small hole is provided between at least the O-ring directly in contact with the liquid refrigerant and the O-ring located adjacent to the O-ring. .

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view of a rotating electric machine according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 11, 12 ... Container body, 13 ... Groove, 1
4 ... Small hole, 2 ... Stator, 31, 32 ... O-ring, P ...
Channel.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 9/00-9/28

Claims (2)

(57) [Claims] 1. A relatively small-diameter first container body (11) having a closed one end and a relatively large diameter second container body (12) having a closed one end. The cylindrical openings are opposed to each other to be fitted to each other to form a closed housing (1), and a concave groove (1) formed on the outer peripheral surface of the first container body (11).
3) is closed on the inner peripheral surface of the second container body (12) which is in contact with the outer peripheral surface with a small gap, and the liquid refrigerant flow path (P) is closed.
Thus, a stator (2) is provided so as to be in contact with the inner peripheral surface of the first container (12), and the groove (13) of the first container (11) is provided.
Outer peripheral surface closer to the opening edge than the second container body (12)
A plurality of seal members (31, 32) are provided between the seal member (31, 32) and an inner peripheral surface of the seal member (31). A rotating electric machine provided with means (14) for detecting leakage of the liquid refrigerant from the flow path (P). The means for detecting the leakage of the liquid refrigerant includes a small hole (1) formed in a cylindrical wall of the second container (12).
The rotating electrical machine according to claim 1, wherein 4).