JPS59106851A - Gas purity maintaining method in hydrogen cooling rotary electric machine - Google Patents

Abstract

PURPOSE:To enable to maintain gas purity in a rotary electric machine by a simple operation by exhausting gas in the machine through an oiler when a vacuum pump is defective and automatically supplying hydrogen gas. CONSTITUTION:An oiler 12 is connected to air side spaces Q, Q' of hydrogen separators 3, 3' in a shaft oil sealer through exhaust gas amount regulating valves 10, 10' and stop valves 11, 11', respectively. When a vacuum pump 9 is stopped, the gas in a rotary electric machine is exhausted through an oiler 12 out of room by opening the valves 11, 11'. Thus, the gas pressure in the machine temporarily decreases, but hydrogen has having high purity is automatically supplied into the machine through a gas supply pipe system E from a gas supply unit, thereby preventing the gas purity in the machine from decreasing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for maintaining in-machine gas purity in a hydrogen-cooled rotating electric machine having a vacuum treatment type shaft seal oil supply device.

In a hydrogen-cooled rotating electrical machine, a shaft seal is provided at the rotating shaft penetrating portion to prevent hydrogen gas inside the machine, which is a cooling medium, from leaking to the outside, and a shaft seal oil seals the hydrogen gas. One type of shaft seal oil supply device that collects and cleans this shaft seal oil and supplies it to the shaft seal portion is a vacuum processing type. The feature of this method is that the oil supplied to the shaft seal is collected and led to a vacuum tank, where hydrogen gas, air, water, etc. contained in the oil are removed from the tank, which is maintained in a vacuum state. Degas it. The degassed oil is then pumped back to the shaft seal. In the shaft seal of a rotating electric machine, shaft seal oil is interposed between high pressure hydrogen gas and atmospheric pressure air, so hydrogen gas and air dissolve into the pond. The air contained in the pond diffuses into the interior of the rotating electric machine at the shaft seal and reduces the purity of hydrogen gas inside the machine, so to prevent this, the oil is degassed.

A system diagram of this shaft seal oil supply device is shown in Fig. 1. In the figure, 1 is the rotating electric machine, 2 and 2' are the shaft seals, and 3.3' is the u
lj bracket 4 is an intermediate oil tank, 5 is a vacuum tank,
6 is a regular oil circulation pump, 7 is an oil cooler, 8 is an oil filter, and 9 is a vacuum pump.As the piping system connecting these, A is a shaft seal oil supply piping system, and B is an air side shaft seal oil discharge. The piping system, C represents the hydrogen gas side shaft sealing oil discharge piping system, D represents the degassing piping system, and E represents the gas supply piping system. To explain the operation of this shaft-sealed oil painting device, first, the oil in the vacuum tank 5 is sent out by the regular oil circulation pump 6 (if the regular oil circulation pump 6 breaks down, the emergency oil circulation pump 6' starts and continues to flow). (oil is sent out) oil cooler7. oil filter 8
After being cooled and filtered through the shaft seal oil supply piping system A
It is then pressure-fed to the shaft sealing section 2°2'. The oil flowing out from the shaft seals 2 and 2' is transferred to the air side space Q of the bearing bracket) 3.3'.
, Q', hydrogen separation chamber, and R/. Hydrogen separation 4J11. The oil that has leaked out to / enters the intermediate oil tank 4 via the hydrogen gas side shaft seal oil discharge piping system C, and returns from the intermediate oil tank 4 to the vacuum tank 5. Also, the air side space Q.

The oil flowing out to Q' returns to the vacuum tank 5 via the air-side shaft seal oil discharge piping system B. The intermediate oil tank 4 has the same hydrogen gas atmosphere as the interior of the rotating electric machine. Hydrogen gas and air in the oil are diffused into the air within the vacuum tank 5, and a mixture of hydrogen gas and air is formed within the tank 5. This tank 5
is maintained in a substantially vacuum state by the operation of the vacuum pump 9, and the above-mentioned air-fuel mixture is degassed through the degassing piping system. In this device, the oil that has leaked into the air side spaces Q, Q' and the oil that has leaked into the hydrogen gas side spaces R, , R/ are combined in the vacuum tank, so a mixture of hydrogen gas and air is always formed. Therefore, if the vacuum pump 9 breaks down, the shaft seal oil in the sealed vacuum tank 5 will not be vacuum degassed.

That is, the shaft seal oil is sent to the shaft seal oil supply piping system by the circulation pump 6 while containing air, and is supplied to the shaft seal parts 2, 2'. When the shaft seal oil containing air flows out from the shaft seal parts 2, 2' and mixes into the interior of the rotating electric machine 1, the purity of hydrogen gas inside the machine gradually decreases due to this. Since this deteriorates the cooling effect of the rotating electric machine, it is necessary to prevent a decrease in the hydrogen gas purity and always maintain the purity Kjl+.

Conventionally, the best way to maintain the gas purity inside the glaze was to install a backup vacuum pump so that the vacuum was always evacuated. However, this single method had the following drawbacks. That is, (1) a mounting space for the preliminary vacuum pump is required, and the occupancy rate of the shaft sealing oil supply device with wi increases.

■Equipment costs will increase due to the addition of pumps and attached piping/control systems.

■New maintenance management of the pump and control system was required.

This is a drawback.

This invention eliminates the above-mentioned drawbacks and provides a method for maintaining the purity of in-flight gas with simple operation and at low cost.For this purpose, according to the present invention, a stop valve and an exhaust valve are installed in the hydrogen separation chamber. An oiler is provided which is connected via a quantity adjustment valve, and when the vacuum pump fails, the stop valve is opened to exhaust hydrogen gas from the oiler and to automatically replenish hydrogen gas into the machine from the gas supply device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for maintaining in-flight gas purity, which is an embodiment of the present invention, will be described below with reference to the drawings. That is, in the present invention,
In the system diagram of the shaft seal oil supply device shown in FIG. 1, the air side space Q of the hydrogen separators 3 and 3'.

The oiler 12 shown in FIGS. 2a and 2 is connected to Q' through a displacement/adjustment valve 10.10' and a stop valve 11.11'. The oiler 12 is shown in the longitudinal cross-sectional view of FIG.
i. Attachment using nuts 12j forms a sealed container.

An inflow pipe 12c is inserted through the upper lid 12b, and the tip opening 12d is made thin so that it is placed in the oil 13 contained in a sealed container, and an exhaust pipe 12e is further provided in the upper part 1j12b. Connect the oil filler port 12f provided on the upper unit 12b to the plug 12.
Drain port 1 provided in the lower cover 12'b by screwing in g and sealing it.
211 is also sealed by screwing in the plug 12g. The tip of the inflow pipe 12C of this oiler 12 is connected between the air side walls of the hydrogen separators 3 and 3' via a stop valve 11.11' and an air adjustment valve 10.10', as shown in FIG. It is connected to Q and Q'.

In this way, when the vacuum pump 9 is stopped and the stop valves 11 and 11' are opened, the gas inside the machine will pass through the oiler 12 to the outside t1. It bothers me. As a result, the gas pressure inside the machine decreases temporarily, but highly pure hydrogen gas is automatically supplied into the machine from a gas supply device (not shown) via the gas supply piping system E. Note that since oil 13 is injected into the oiler 12, by counting the number of bubbles, the amount of exhaust gas in the cabin to the outside can be measured. The outdoor exhaust amount is adjusted by operating the exhaust amount regulating valve 10.10'.

The present invention is equipped with an oiler, and when the vacuum pump fails, the in-machine gas is discharged via the oiler, and hydrogen gas is automatically replenished. Therefore, the purity of the in-machine gas is always maintained without deterioration, and the cost is low. Therefore, maintenance can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a piping system diagram of a shaft sealing oil supply device, Fig. 2a is a conceptual diagram of an oiler used in a method for maintaining in-flight gas purity according to an embodiment of the present invention, and Fig. 2 is an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of an oiler used in the in-flight gas purity maintenance method. 1: Hydrogen cooled rotating electric machine, 2. 2': Shaft seal, 5: Vacuum tank, 9: Vacuum pump, lO: Exhaust +41 adjustment valve, 11st stop valve, 12: Euler, R, R/:
Hydrogen separation chamber. 71 Closed! 7z mouth 12'I

Claims (1)

[Claims] 1) Shaft seal oil is collected from the shaft seal part of a hydrogen-cooled rotating electric machine that has a gas supply device that automatically replenishes hydrogen gas into the machine through a hydrogen separation chamber, and introduced into a vacuum tank, and this shaft seal oil is transferred to a vacuum pump. In the vacuum treatment type shaft seal oil supply device that deaerates the air and supplies it again to the shaft seal section, an oiler is provided which is connected to the hydrogen separation chamber via a stop valve and a displacement adjustment valve, and when the vacuum pump malfunctions, the stop valve is connected to the hydrogen separation chamber. A method for maintaining gas purity in a hydrogen-cooled rotating electric machine, comprising opening a valve to exhaust hydrogen gas from the oiler and automatically replenishing hydrogen gas into the machine from a gas supply device.