JPS6154998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bearing lubricating device used, for example, in a bearing of a rotating electrical machine such as a high-speed rotating electrical machine.

[Technical background of the invention]

In general, in this type of rotating electric machine, each bearing supports a rotating shaft that is integrated with the rotor shaft, so bearings are lubricated to extend the life of the bearings. The lubricating oil system for the bearings of high-speed rotating electric machines not only eliminates wear, noise, and vibration, but also protects the bearings by helping them rotate smoothly.

Therefore, conventionally, as a bearing lubrication method for high-speed rotating electric machines, so-called oil mist lubrication, in which lubricating oil is supplied to the bearings in the form of a mist, has been used, but this oil mist lubrication method causes environmental pollution. In addition, it is difficult to recover the lubricating oil in the form of a mist, and the lubricating oil is uneconomically consumed.

On the other hand, as shown in FIG. 1, an already proposed bearing lubricating system for a rotating electrical machine of this type operates intermittently over a long period of time by using an intermittent supply controller b to feed a lubricating oil pump a. The lubricating oil is intermittently driven to the metering element c, while the air tank d stores compressed air.
supplying compressed air to the metering element c from
A certain amount of lubricating oil and compressed air are mixed in this metering element c and are supplied in a non-mist state to the bearing e of the rotating electric machine.

[Problems with background technology]

However, although the above-mentioned conventional bearing oil supply device does not cause the problem of environmental pollution due to mist, the above-mentioned oil supply pump a is forced to perform intermittent operation at high frequency for a long period of time due to the intermittent controller b. , the failure rate is high, and there are problems with reliability as a refueling device.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and is capable of lubricating a bearing by mixing lubricating oil in a non-mist state without using an oil supply pump or a metering element, and supplying the bearing with compressed air continuously. The purpose of the present invention is to provide a bearing lubrication device for cooling a bearing by supplying oil to the bearing.

[Summary of the invention]

In particular, the present invention connects an air supply source to the bearing with an air supply pipe, connects a side path branched from the middle of the air supply pipe to the air supply pipe near the bearing,
This side passage is constructed by installing an on-off valve that opens and closes intermittently, an oil injection system equipped with an oil supply source, and an oil-air mixer in this order.

[Embodiments of the invention]

Hereinafter, an illustrated embodiment in which the present invention is applied to a bearing of a rotating electric machine will be described.

In FIGS. 2 to 4, reference numeral 1 denotes a bearing in a rotating electrical machine, and an air supply source 2 is connected to this bearing 1 through an air supply pipe 3.
This air supply pipe 3 has a side path 4 branched from the middle.
is located near the bearing 1, and the air supply pipe 3 is located near the bearing 1.
It is connected in an almost perpendicular direction. Also, this side road 4
is equipped with an on-off valve 5, such as an electromagnetic three-way valve, which opens and closes intermittently in order from a position close to the air supply source 2, an oil injection 7 and an oil-air mixer 8, which are equipped with an oil supply source 6. has been done.

On the other hand, the on-off valve 5 supplies compressed air from the air supply source 2 to the side path 4 in response to a pulse signal from a timer or an intermittent supply controller 5a, for example.
The oil injector 7 is intermittently supplied through the oil injector 7, and the oil injector 7 is capable of pumping the lubricating oil vacuum-supplied from the oil supply source 6 to the gas-oil mixer 8. Further, this air/oil mixer 8 is composed of a check valve 8a and a spout 8b formed at the connection part with the air supply pipe 3, and this air/oil mixer 8 is configured to reversely feed lubricating oil. The compressed air from the air supply source 2 is mixed into the bearing 1 through the air supply pipe 3 together with the compressed air in a non-mist state.
It is now possible to supply to Furthermore, even when the intermittent refueling from the air-oil mixer 8 is stopped, that is, when the on-off valve 5 is closed (see Fig. 3), compressed air from the air supply source 2 is still supplied from the air supply pipe 3. Since it is continuously supplied to the bearing 1, the bearing 1 is always cooled.

The lubricating oil located at the spout 8b of the air-oil mixer 8 is supplied into the bearing 1 while being pushed by compressed air along the inner wall surface of the air supply pipe 3 up to the bearing 1. Therefore, even when the lubricating oil from the oil injector 7 is temporarily stopped, a small amount of lubricating oil flows into the bearing 1 along with the compressed air.
will be supplied to Furthermore, the time interval (pulse interval) for supplying this lubricating oil is approximately several minutes to several minutes.
It takes 10 minutes, and the amount of refueling per time is preferably about 0.03cc.

Next, the oil injection system 7 equipped with the oil supply source 6 has the configuration shown in FIG. 4. That is, this oil injection extension 7 has an oil supply port 10 connected to an oil supply source 6 in the middle of a cylindrical housing (main body) 9, and applies lubricating oil to a check retainer 11 at the tip of the housing 9. A one-way valve (check valve) 13 is provided which connects a part of the side passage 4 which is pressurized and discharged, and is equipped with a spring 12 that provides a valve closing habit to the housing 9 in which the check retainer 11 is located;
An end cap 15 having an adjustment knob 14 screwed thereon is screwed onto the rear end of the housing 9, a cylinder 16 is formed in the housing 9 where the end cap 5 is located, and a piston 17 is slidably inserted into the cylinder 16. A metering pin 18 having a flange 18a is provided on the piston 17 so as to pass through the housing 9 so as to penetrate the oil supply port 10 and push the one-way valve 13 to open it. The measuring pin 18 can be moved back by the elasticity of a coil spring 20 interposed between the flange 18a and a washer 19 attached to the cylinder 16. Note that the reference numeral 21 is a manual operation lever.

Therefore, the compressed air intermittently pumped from the side passage 4 passes through the air supply port 22 formed in a part of the housing 9 and moves the piston 17 in which the cylinder 16 is located against the elasticity of the coil spring 20. Press and move. Then, the measuring pin 18 integrated with the piston 17 presses the one-way valve 13 against the elasticity of the spring 12 together with the lubricating oil previously injected into the oil filler port 10 to open the valve. Therefore, a certain amount of lubricating oil is supplied by the measuring pin 18 into the oil sump 9a where the one-way valve 13 is located, and furthermore, the lubricating oil in the side passage 4 is pumped to the air-oil mixer 8. It's becoming like that.

On the other hand, when the supply of compressed air that is intermittently pumped from the on-off valve 5 is stopped, the piston 17 and the measuring pin 18 return to their original positions by the stored elasticity of the coil spring 20; The directional valve 13 can be closed by the stored elasticity of the spring 12.

In this way, the oil injection system 7 intermittently supplies lubricating oil to the gas/oil mixer 8, and as described above, the gas/oil mixer 8 is connected to the air supply pipe 3. The mixed lubricating oil is supplied to the bearing 1 in a non-mist state by the cooperation with the compressed air. Further, the compressed air from the air supply pipe 3 is continuously supplied to the bearing 1, so that the bearing 1 can be cooled.

[Effects of the Invention] As described above, according to the present invention, the air supply source 2 is connected to the bearing 1 through the air supply pipe 3, and the side passage 4 branched from the middle of the air supply pipe 3 is connected to the bearing 1. It is connected to a nearby air supply pipe 3, and an on-off valve 5 that opens and closes intermittently in this side passage 4, an oil injection 7 equipped with an oil supply source 6, and an oil-oil mixer 8 are installed in this order, so the proposal has already been made. Unlike this type of bearing lubrication system, a lubrication pump is not required, which not only simplifies maintenance and inspection, but the lubricating oil does not turn into a mist, so excess oil can be collected and reused. The compressed air has excellent effects such as being able to constantly cool the bearing 1.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a bearing oil supply device that has already been proposed, FIG. 2 is a system diagram of a bearing oil supply device according to the present invention, FIG. 3 is a system diagram for explaining the operation of the present invention, and FIG. 4 FIG. 1 is an enlarged cross-sectional view of an oil injection system incorporated in the present invention. 1...Bearing, 2...Air supply source, 3...Air supply pipe, 4...Side channel, 5...Opening/closing valve, 6...Oil supply source, 7...Oil injection, 8...Air and oil mixer.

Claims (1)

[Scope of Claims] 1. An air supply source is connected to the bearing through an air supply pipe, and a side passage branched from the middle of the air supply pipe is connected to an air supply pipe near the bearing, and an air supply source is intermittently connected to the side passage. A bearing oil supply device characterized in that an on-off valve that opens and closes, an oil injection system equipped with an oil supply source, and an air-oil mixer are installed in this order. 2. The bearing oil supply device according to claim 1, wherein the on-off valve can be opened and closed intermittently by a timer or an intermittent supply controller.