JPS6026525Y2 - In-machine abnormality monitoring device for rotating electrical machines - Google Patents

Description

[Detailed explanation of the invention] This invention detects the abnormality by detecting the fine particles generated when a rotating electric machine such as a generator has an abnormality such as overheating inside the machine, and collects a sample of the fine particles. Concerning improvements in monitoring equipment.

In a fully enclosed rotating electric machine, if there is an abnormality such as partial overheating inside the machine, fine particles are generated from organic materials such as insulators in that part and mix into the cooling gas (for example, hydrogen gas) circulating inside the machine.

In large-capacity rotating electric machines, such as turbine generators, cooling gas is branched outside the small-flow machine and passed through an abnormality monitor to detect an abnormality.The flow path of the branched cooling gas is switched to the sample collector side based on the signal. Some aircraft are equipped with an in-flight abnormality monitoring device that collects fine particles as samples.

A conventional in-flight abnormality monitoring device of this type has a schematic configuration diagram shown in FIG.

1 is a rotating electric machine such as a generator, and a cooling gas such as hydrogen gas is circulated inside the machine in the direction of an arrow by a rotor fan (not shown) to cool the machine.

The cooled gas, which has been cooled and whose temperature has risen, passes through a gas cooler (not shown) in the circulation path and is cooled.

Reference numeral 2 denotes an abnormality monitor, through which a small flow of cooling gas within the rotating electric machine 1 is branched from the high pressure side H through a branch conduit 4, and returned to the low pressure side through a return conduit 5.

The abnormality monitor 2 is configured as follows.

The introduced gas is ionized by irradiation with a radiation source, and then a high voltage is passed between a pair of collector electrodes and a negative voltage.

When fine particles are mixed in the cooling gas, ions adhere to the fine particles, resulting in a decrease in the current between the collector electrodes.

As a result, the presence of an overheated area inside the aircraft is detected and an indication is given, a recorder is used to record the information, and an alarm is issued to issue an alarm.

Reference numeral 3 denotes a sample collector, which has a built-in filter (not shown), through which branched gas is passed through a branch conduit 6 and returned to the return conduit 5 via a return tube 7.

If particulates are mixed in the branched gas, they will be collected as a sample by a filter.

The stop valve 8 is normally open and the branched gas is sent to the abnormality monitor 2.
The stop valve 9.10 is normally closed.

In the conventional apparatus described above, while the rotating electric machine 1 is in operation, a small amount of cooling gas is constantly branched to the abnormality monitor 2 for inspection.

At this time, stop valves 9 and 10 are closed.

When an accident occurs in an aircraft and an overheated spot occurs, fine particles generated from the superheated organic matter mix into the cooling gas.

An abnormality monitor 2 through which this cooling gas is branched and passed through detects mixed particles and issues a signal.

In response to this signal, electromagnetic opening/closing means (not shown) close the operating stop valve 8 and open the stop valves 9 and 10, respectively.

The branch cooling gas containing fine particles] is passed to the sample collector 3 via a branch conduit 6.

When the particulate sample reaches a set amount, it is detected by the set amount detection means (not shown), and the output signal causes the electromagnetic opening/closing means (not shown) to operate the stop valves 6 and 10 to open the stop valve 8. Switch back.

The particulate sample collected by the sample collector 3 is analyzed by an analyzer to determine the part of the insulating material that is abnormally heated, and prompt maintenance measures are taken.

In the conventional in-machine abnormality monitoring device, the abnormality monitor 2 and the particulate collector 3 are located at a considerable distance (several meters to several tens of meters) from the rotating electric machine 1, and the branch conduits 4 and 6 are of considerable length.

The longer this branch pipe becomes, the more fine particles will be adsorbed on the inner surface of the pipe.
This caused condensation, detection errors, and inability to collect particles.In addition, the amount of collected particulate samples was insufficient and the time required to collect the particles was long.

This idea heats the branch pipe with a heating device, and applies the physical phenomenon that the adsorption amount of fine particles on the solid surface decreases as the temperature of the solid increases. The object of the present invention is to provide an in-machine abnormality monitoring device for a rotating electric machine that prevents condensation, improves the reliability of abnormality detection, and reliably collects a sample.

FIG. 2 is a schematic configuration diagram showing an in-flight abnormality monitoring device according to an embodiment of this invention, in which numerals 1 to 10 are the same as the conventional device described above.

Reference numeral 11 denotes a heater installed around the outer periphery of the first branch conduit 4 and the second branch conduit 6, and is composed of, for example, an electric heater.

12 is a heating controller, which connects the heater 11 with a connecting wire 13;
is connected to adjust the temperature to the appropriate temperature.

Thus, branch conduit 43. By heating the particles to an appropriate temperature, even if an abnormality occurs inside the machine and fine particles are generated, adsorption to the inner surfaces of the branch conduits 4 and 6 will be prevented, and the abnormality monitor 2 will reliably detect abnormalities. be able to.

When the rotating electric machine 1 is operated and the abnormality monitor 2 is used, the interlocking signal operates the heater 12 through the connection line 14, so that the heater 11 is energized.

In this way, when the abnormality monitor 2 is in use, the branch conduits 4 and 6 are always
is heated.

In the apparatus of the above embodiment, the branched cooling gas from the rotating electric machine 1 normally returns to the inside of the machine through the branch conduit 4, the abnormality monitor 2, and the return conduit 5.

At this time, the stop valve 8 is open and the stop valves 9 and 10 are closed.

Further, the branch pipes 4 and 6 are heated and heated by a heater 11.

If there is an abnormality such as partial heat generation inside the aircraft, fine particles are generated from that area and mixed into the cooling gas.

Then, the abnormality monitor 2 detects this and activates the alarm, and the stop valve 8 is closed by a signal.
10 is switched to open.

The sample collector 3 through which the branched cooling gas is passed starts collecting particulates.

As mentioned above, the branch conduits 4 and 6 are constantly heated,
Fine particles generated due to an abnormal condition and mixed into the cooling gas are prevented from adhering to the inner surfaces of the branch conduits 4 and 6, allowing the abnormality monitor 2 to accurately detect them, and the sample collector 3 to collect fine particles in a sufficient amount. The time required for collection is also reduced.

As described above, according to this invention, the branch conduit that leads the branch cooling gas to the abnormality monitor and sample collector is heated with a heater, which prevents adsorption and condensation of particulates on the inner surface of the tube. , the reliability of abnormality detection is improved, and particulate samples can be collected reliably.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a conventional in-flight abnormality monitoring device, and FIG. 2 is a schematic configuration diagram showing an in-flight abnormality monitoring device according to an embodiment of this invention. 1... Rotating electric machine, 2... Abnormality monitor,
3... Sample collector, 4, 6... Branch conduit, 8, 9. 10... Stop valve, 11...
- Heater, 12... Heating controller. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The cooling gas circulating inside the rotating electric machine is led to the abnormality monitor through the first branch conduit, and the abnormality monitor detects fine particles generated from organic matter due to overheating inside the machine. In the apparatus, the branched cooling gas from the branched conduit is switched to a sample collector through a second branched conduit, and a sample of fine particles generated by the overheating is collected by the sample collector. An in-machine abnormality monitoring device for a rotating electrical machine, comprising a heater attached to the first and second branch conduits to heat these conduits and prevent the fine particles from being adsorbed to the inner surface of the tubes.