JPH0210280Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a shaft sealing device for a Stirling engine.

The Stirling engine has a structure in which the working piston, which creates the working space, and the crank mechanism or swash plate mechanism of the crank chamber are connected by a rod, and one chamber of the crank chamber is sometimes used as a Freon gas compression chamber. On the other hand, since the output of a Stirling engine is approximately proportional to the average gas pressure in the working space, an intermediate chamber and an oil chamber are provided between the working space and the crank chamber to maintain the intermediate chamber at the lowest pressure of the working gas. Although this prevents working gas from leaking, it cannot completely prevent gas from flowing into the oil chamber. When the crank chamber is used as a Freon gas compression chamber, when comparing the pressure of working gas such as helium gas and Freon gas, the pressure of the working gas is higher, and the working gas enters the crank chamber and increases the pressure of the Freon gas compression chamber.

This idea was intended to solve the above-mentioned problems of the conventional technology.Basically, the lowest pressure of working gas acts between the intermediate chamber and the crank chamber, and the high-pressure oil chamber acts between the atmospheric pressure and the intermediate chamber. Using technical means, the high-pressure oil chamber communicates with the high-pressure oil tank and the low-pressure oil chamber communicates with the low-pressure oil tank. Working gas and freon gas from the crank chamber flow into the low-pressure oil chamber, and the low-pressure Both gases are released to the atmosphere through the oil tank, and working gas is prevented from flowing into the freon gas compression chamber of the crank chamber.

The working gas and Freon gas that have flowed into the low pressure oil chamber along the rod are guided into the low pressure oil tank and are discharged from this tank without being recovered to the outside. In fact, working gas and helium gas are mixed together with oil in the low-pressure oil tank. Therefore, complicated equipment is required to separate and recover these gases. Therefore,
It is most economical to release the oil from the low-pressure oil tank without recovering it. Furthermore, if the low-pressure oil tank were to be sealed in an attempt to recover the oil, the pressure inside the low-pressure oil tank would rise due to the leaked working gas and Freon gas, making it impossible to maintain the internal pressure at atmospheric pressure.

Since the low-pressure oil tank communicates with the oil chamber of the crank chamber, when the oil level in the low-pressure oil tank drops, it is possible to replenish the oil by operating a pump or the like. In this case, the Freon gas filled chamber in the crank chamber is a compression chamber for Freon gas, and the inside of the crankcase is a sealed space filled with the suction pressure in the compression chamber, and the pressure is always higher than the pressure in the low-pressure oil tank. It's summery. Therefore, the pressure difference between the two pressures can be used to replenish oil from the crank chamber to the low-pressure oil tank, reducing the pump load.

An embodiment of this invention will be described with reference to the accompanying drawings.

The working piston 2 of the Stirling engine 1 is
It is connected to a guide piston 4 in the crank chamber 3 via a rod 5. A gas seal 7, an intermediate chamber 8, a scraper seal 9, a high pressure oil chamber 10, A triangular oil seal 11, a low pressure oil chamber 12, and a gas seal 13 are arranged side by side. The intermediate chamber 8 is communicated with the working space 6 via a filter 14 and a check valve 15.

A high pressure oil chamber 10 is communicated with an intermediate chamber 8 via a high pressure oil tank 16. As a result, the lowest working pressure of the working gas in the working space 6 is applied to the high-pressure oil chamber 10 via the high-pressure oil tank 16. The low pressure oil chamber 12 is communicated with a low pressure oil tank 17 opened to the atmosphere, and the low pressure oil tank 17 is communicated with the oil chamber of the crank chamber 3,
When the oil level in the low pressure oil tank 17 drops, oil is supplied from the crank chamber 3 to the low pressure oil tank chamber 17.

In the above-described configuration, the high pressure oil chamber 1 is passed from the working space 6 through the intermediate chamber 8 via the gas seal 7.
The working gas that has entered the tank returns to the intermediate chamber 8 via the high-pressure oil tank 16. On the other hand, the working gas entering the low pressure oil chamber 12 from the high pressure oil chamber 10 is
It is captured by oil in the low pressure oil chamber 12 and released into the atmosphere from the low pressure oil tank 17. Further, the Freon gas that has entered the low pressure oil chamber 12 from the Freon gas filling chamber 18 of the crank chamber 3 is also released from the low pressure oil tank 17 to the atmosphere. The oil leaking from the low pressure oil chamber 12 to the crank chamber 3 via the gas seal 13 is kept constant at all times by replenishing the oil in the crank chamber 3 to the low pressure oil tank 17. In this way, the low pressure oil chamber 12 is provided, and the working gas of the Stirling engine 1 is released to the atmosphere and is not allowed to flow into the Freon gas chamber 18, so that the pressure rise due to the inflow of working gas such as helium gas into the Freon gas chamber 18 is prevented. There is no.

[Brief explanation of the drawing]

The figure is an explanatory view of a shaft sealing device for a Stirling engine as an example of this invention. In the diagram: 1... Stirling engine, 2... Working piston, 3... Crank chamber, 5... Rod,
6...Working space, 8...Intermediate chamber, 10...High pressure oil chamber, 12...Low pressure oil chamber, 16...High pressure oil tank, 17...Low pressure oil tank, 18...
...Freon gas filled chamber.

Claims (1)

[Scope of utility model registration request] An intermediate member located between the working space of the Stirling engine and the crank chamber, a part of which serves as a Freon compressor, and which passes through the rod, includes an intermediate chamber and a high-pressure oil chamber in order from the working space side to the crank chamber side. and a low-pressure oil chamber, the high-pressure oil chamber communicates with the working space and the intermediate chamber upstream of the check valve via a high-pressure oil tank and a check valve, and the low-pressure oil chamber communicates with the upstream side of the check valve. A shaft sealing device for a Stirling engine, which communicates with the oil chamber of the crank chamber through a tank, and releases working gas and Freon gas that have flowed into the low-pressure oil chamber without recovering them through the low-pressure oil tank. .