JPS633503Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shaft sealing device for a rotating machine, and in particular, the shaft sealing device of the present invention is effective when used in a refrigerant compressor for an air conditioner of an automobile.

A conventional shaft sealing device for a rotating machine will be explained based on a shaft sealing device used in an open-type refrigerant compressor for an automobile air conditioner.The conventional shaft sealing device has a structure shown in Fig. 1. The rotary shaft 3 held in the housing 1 by the bearing 2 is airtight.
a driven ring 4 that is in close contact with the shaft surface to maintain airtightness with the shaft surface; and a fixed ring 6 that is fixed to the housing 1 via an O-ring 7 and maintains airtightness with the housing 1.
and a sliding ring 5 that slides between these rings 4 and 6 while maintaining oil tightness and maintains airtightness between the driven ring 4 and the fixed ring 6. . In the shaft sealing device having this configuration, an oil film caused by lubricating oil in the compressor exists on the contact surface between the fixed ring 6 and the sliding ring 5, and this oil film enhances the sealing effect. .

However, since the pressure inside the compressor is usually higher than atmospheric pressure, and the compressor vibrates due to vibrations of the vehicle, it is inevitable that the oil film will leave the contact surface and leak.

Therefore, in the conventional shaft sealing device, there was a problem in that this leaked oil flows outside the compressor (in the direction A in the figure) and is scattered around due to the rotation of the rotating shaft 3, contaminating the area around the rotating machine.

The present invention was devised in view of the shortcomings of the conventional devices, and includes a shaft seal device and a shaft seal device disposed on the outside of the rotating machine to prevent fluid leaking from the shaft seal device. a leak prevention member for preventing further leakage to the outside of the rotating machine, one end of which opens near the bottom between the shaft sealing device of the housing and the leakage member, and the other end of which is located below the one end on the outer surface of the housing; an oil pool mechanism for preventing the discharged oil from contaminating the lower part of the rotating machine; This prevents problems such as leaked oil from contaminating the rotating machine and its surroundings.

The present invention will be described below based on embodiments shown in the drawings.

Fig. 2 shows an embodiment of the device of the present invention used in a refrigerant compressor for an automobile air conditioner. 1 is a housing of a compressor A, and a cylindrical hub portion 1a and a diameter larger than the hub portion 1a are shown. It consists of a large disk-shaped portion 1b. 3 is a rotating shaft, and 4 is a rubber driven ring, which is in close contact with the rotating shaft 3 and rotates together with the shaft 3 to maintain airtightness between the shaft 3 and the rotating shaft 3. 4a is a case that supports this driven ring 4; 6 is a fixed ring that maintains airtightness between it and the housing 1; its outer circumferential surface is fixed to the housing 1 via an O-ring 7; and its inner circumferential surface has a rotating shaft 3. It is loosely inserted. Reference numeral 5 denotes a sliding ring made of carbon, which is brought into close contact with the support case 4a of the driven ring 4 through a sliding ring receiver 5a to maintain oil tightness between the fixed ring 6 and the driven ring 5.

Reference numeral 8 denotes a leakage prevention member made of rubber, which prevents leakage oil from the shaft sealing device from flowing out through the shaft 3 to the outside of the rotating machine. Reference numeral 12 designates a discharge hole, one end of which opens at the bottom between the fixing ring 6 and the leakage prevention member 8 of the housing 1, and the other end of which opens at the outer surface of the housing 1 below this one end.

The opening of the discharge hole 12 on the outer surface of the housing is the upper part of the space 14 formed by the outer surface of the housing and the cover 9 fixed to the entire surface of the disc-shaped portion of the housing 1 via an O-ring 10 on the outer surface. Located in Therefore, a space 14 between the housing 1 and the cover 9 formed below the discharge hole 12 is a space (hereinafter referred to as a tank 14) in which leaked oil can be stored since the housing 1 and the cover 9 are sealed by the O-ring 10. becomes.

The cover 9 is provided with an O-ring 10 on the outer periphery of the hub portion 1a of the housing 1 at a portion closest to the disc-shaped portion 1b.
At the same time, it is fixed to the stator 11 of the electromagnetic clutch B, and is fixed to the housing 1 at the same time as the electromagnetic clutch stator 11 by the fixing circular clip 21.

The operation of the device of the present invention having the above configuration will be explained next. When the excitation coil 11a of the electromagnetic clutch B is energized from an external power source, the friction surface 15 of the rotor 15
The armature 16 is attracted and attracted to the armature 16, and the rotational force received from the pulley 15a is transmitted to the rotating shaft 3 via the rotor 15, the armature 16, the cushion rubber 17, and the hub 20. and excitation coil 11
When the power supply to a is cut off, the armature 16 separates from the rotor 15 due to the restoring force of the cushion rubber 17, so that rotation transmission to the rotating shaft 3 is cut off.

Here, as mentioned above, the shaft seal device maintains airtightness with the rotating shaft 3 with the driven ring 4 and airtightness with the housing 1 with the fixed ring 6, and also between the driven ring 4 and the fixed ring. 6 is maintained airtight by the sliding ring 5. The airtightness between the sliding ring 5 and the fixed ring 6 is maintained particularly by a lubricating oil film formed on the sliding surface between the rings 5 and 6.

The lubricating oil that forms this oil film is compressor A.
Due to internal pressure, vibrations of the compressor A, etc., a small amount leaks from the sliding surface, flows into the inner circumferential surface of the fixing ring 6, and is further guided inside the housing to move toward the electromagnetic clutch B side. In this case, the leaked oil may flow along the rotating shaft 3 to the electromagnetic clutch B side, so in this example, a leak prevention member 8 is especially provided to prevent the lubricating oil leaking from the shaft sealing device from flowing along the rotating shaft 3. This prevents leakage. Therefore, the leaked oil is stored in the oil storage chamber 13 surrounded by the leakage prevention material 8, the shaft seal device 6, and the housing 1, and then, by gravity, the oil is drained into the drain hole 12 provided on the housing side at the bottom of the oil storage chamber 13. flows into. The upper part of the oil storage chamber 13 communicates with the outside of the housing 1 through the vent hole 22, and therefore the pressure inside the chamber 13 is approximately atmospheric pressure, so that the sealing function by the prevention member 8 is improved. It is starting to be achieved.

One lower end of the drain hole 12 opens into an upwardly open tank 14 formed by the cover 9, the O-ring 10, and the housing 1, so that leaked oil flows through the drain hole 12 into the tank 14 due to gravity. It falls and is stored.

Therefore, the entire amount of leaked oil is stored in the tank 14, and it is prevented from scattering to the electromagnetic clutch B side and causing loss of the clutch B.

In the above embodiment, the leakage prevention material 8 was provided on the outside of the shaft sealing device, but as shown in FIG.
The weir 19 may be formed by, for example.

Furthermore, in the embodiment described above, a discharge hole 12 is provided to guide the leaked oil from the oil storage chamber 13 to the tank 14, but as shown in FIG. It is also good to lead inside. In this case, since the leaked oil is reliably guided by the felt, rope, etc., this is particularly effective when machining the discharge hole 12 leading from the oil storage chamber 13 to the tank 14 is difficult.

Further, in the embodiment described above, the O-ring 10 was used to seal the cover 9 and the housing 1 and to fix the cover 9 to the housing 1. The ring may be omitted.

Further, in the above-described embodiment, the tank 14 for storing leaked oil is hollow, but a material that easily absorbs oil, such as felt fiber, may be inserted into the tank 14. In this case, if the rotating machine is subject to large vibrations, this is an effective means to prevent stored oil from overflowing due to vibrations.

In addition, in the above-mentioned embodiment, an example was shown in which the shaft sealing device of the present invention was used in an open compressor for an air conditioner of an automobile. Needless to say, the driving source of a rotating machine using the sealing device of the present invention is not limited to an automobile engine.

As explained above, the shaft sealing device of the present invention includes a leakage prevention member provided outside the shaft sealing device of a rotating machine to form an oil storage chamber between the shaft sealing device, the leakage prevention member, and the rotating machine housing 1, Furthermore, the housing discharge hole at the bottom of this oil storage chamber is opened, and the other end of this discharge hole is configured to communicate with the tank 15 formed by the cover and the housing, so that the oil leaking from the shaft seal device is discharged into the oil storage chamber. - Discharge hole - can flow into the tank and pool in the tank 14, resulting in an excellent effect of preventing leaked oil from contaminating the outer surface of the rotating machine and the surroundings of the rotating machine. is obtained. In addition, by pooling the leaked oil inside the rotating machine, there is also the excellent effect of preventing the leaked oil leaked from the rotating machine from contaminating other equipment disposed around the rotating machine. Furthermore, in the present invention, since the housing is provided with a ventilation hole, leakage can flow smoothly through the discharge hole. Furthermore, in the present invention, the cover is shaped to cover the entire disk-shaped portion of the housing, and the cover is fitted into the housing, which facilitates the process of assembling the cover. In particular, in the present invention, the cover is also fixed at the same time using the locking piece for locking the electromagnetic clutch stator 11, which makes the cover fixing procedure extremely easy and reduces the cost for fixing the cover. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional shaft sealing device, Fig. 2 is a sectional view showing an embodiment of the shaft sealing device of the present invention, and Fig. 3 is a sectional view showing an embodiment of the shaft sealing device of the present invention.
4 are sectional views showing other embodiments of the bearing device of the present invention. DESCRIPTION OF SYMBOLS 1...Housing, 3...Rotating shaft, 6...Fixing ring, 8...Leakage prevention member, 9...Cover, 1
2...Discharge hole, 13...Oil storage chamber, 14...Tank.

Claims (1)

[Scope of utility model registration request] A housing 1 for a rotating machine having a cylindrical hub portion 1a and a disc-shaped portion 1b having a larger diameter than the hub portion 1a.
a rotary shaft 3 rotatably disposed inside the housing 1 and having one end exposed outwardly from the hub portion 1a of the housing; and a rotary shaft 3 disposed between the housing 1 and the rotary shaft 3; Shaft sealing devices 4, 5, 6, and 7 that prevent the fluid inside the housing 1 from leaking along the rotating shaft 3; and a shaft sealing device 4,
5, 6, and 7, the shaft sealing device 4,
a leakage prevention member 8 for preventing leakage oil from flowing out from 5, 6, and 7; and the hub portion 1a of the housing 1.
Stator 11 fixed by locking piece 21 to
a pulley 15a that is rotatably supported on the hub portion 1a via a bearing and a rotor 15 and transmits external rotational force to the rotating shaft; and the shaft sealing device 4, 5, whose one end is the housing 1. a discharge hole 12 that opens near the bottom between the leakage member 8 and the leakage member 8; 4, 5, 6, 7 and the leak prevention member 8, and the other end thereof is above the one end and opens on the outer surface of the housing 1; Disc shaped part 1
b is fitted onto the entire outer surface of the housing 1 through a sealing material 10, and is fixed to the housing 1 at the same time as the stator 11 by the locking piece 21, and is fixed to the discharge hole 12 at the same time as the stator 11.
A shaft sealing device for a rotating machine, comprising a cover 9 that is disposed to cover the other end and forms a leaked oil storage space 14 that is closed together with the housing 1.