JPS6321822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an oil separator for a Stirling engine seal.

Generally, a Stirling engine has a working space filled with working gas at a fairly high pressure to form a thermal cycle, but it is difficult to completely seal off the high-pressure gas in the working space without any lubrication, and it is not durable. Therefore, the seal member is often used in an oil-lubricated state. In this case, since the working gas and oil are mixed, the oil separator separates them into gas and oil, and the gas is returned to the working space and the oil is returned to the crank chamber. A funnel valve is used as a method of returning oil to the crank chamber, but conventional float members have the disadvantage of being damaged during use in an extremely high pressure atmosphere.

The object of the present invention is to provide an oil separator that has the function of separating a mixture of gas and oil released from a sealing device of a Stirling engine into gas and oil, and easily returning the gas to the working space and the oil to the crank chamber. To provide a gas and oil separator that will not be damaged even under abnormally high pressure.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a sealing device for a Stirling engine according to the present invention.
A piston 2 connected to the piston 2 is disposed within the cylinder 1, and the inside of the cylinder is separated into an expansion space 6 and a compression space 7 by a piston ring 5. The compression space 7 is communicated with a cooler (not shown) via a passage. The passage 8 communicates with a first check valve 9 that opens only in the direction of the compression space 7 and a second check valve 10 that opens only in the opposite direction, and the first check valve 9 The second check valve 10 is communicated with the storage tank 12 through a pressure-reducing valve 13 and a compressor 14.

A sealing device 15 is disposed below the compression space 7 so as to pass through the rod 3. The sealing device 15 includes a first sealing material 16 that seals gas without lubrication, a second sealing material 17 that scrapes off oil, and a third sealing material 17 that seals gas with oil lubrication.
A gas space 19 between the first seal material 16 and the second seal material 17 is connected to the oil separator 100 via a conduit 20. and communicates with a conduit between the first check valve 9 and the pressure increase valve 11,
The second sealing material 17 and the third sealing material 1
8 is communicated with the oil separator 100 via a conduit 22. Also,
The oil separator 100 is connected to a crank chamber (not shown) via a conduit 23.

Next, the configuration of the oil separator 100 will be explained based on FIG. 2.

The upper lid 101 and the lower lid 102 are screwed together with a barrel 103 and sealed with O-rings 104 and 105. A filter box 1 is attached to the upper lid 101.
06 is attached, and a filter 107 made of felt, wire mesh, etc. is built into the filter box 106 and fixed by a ring 108. Further, a plurality of ventilation holes 109 and a ventilation pipe 110 are provided at the upper end of the filter box 104, and the ventilation pipe 110 extends to the float chamber 111 through the filter 107. A float valve is provided at the bottom of the float chamber 111. The float valve 120 has a float 12
1 and the lever 122 are integrated, and the lever pin 12
3 as a fulcrum, the needle 124 is attached to the lever 122 by a needle pin 125 and opens and closes the valve hole 127 of the valve seat member 126. or,
An O-ring 12 is attached to the outer periphery of the valve seat member 126.
8 is provided. The inner space 129 of the float 121 has a tube 130 made of a flexible material.
It communicates with the ventilation pipe 110 through.
The upper lid 101 is connected with the conduit 20 communicating with the ventilation pipe 110 and with the conduit 22 communicating with the float chamber 111. Further, the lower lid 102 has an oil groove 13.
1 is provided to communicate with the valve hole 127, and further communicates with the conduit 23.

In the above structure, in the sealing device and oil separator, the gas space 19 and the mist space 21 are filled with working gas at the lowest cycle pressure, and the third seal member 1
8 prevents the working gas from leaking into the atmosphere. Oil that enters the mist space 21 from the sliding surface between the third seal member 18 and the rod 3 is scraped off by the second seal member 17, accumulates in the mist space 21, and passes through the conduit 22 to the oil separator 100 as working gas. Enter in a mixed state. The mixture of oil and working gas entering the oil separator 100 is stored in a float chamber 111.
The oil and working gas are separated from each other, the oil accumulates in the lower part of the float chamber 111, and the working gas flows into the conduit 20 through the filter 107 and the vent hole 109.
Therefore, no oil components enter the gas space 19 and the working space which communicate with the conduit 20. Float chamber 1
The oil accumulated at the bottom of the float 11 lifts the float 121 by buoyancy, and the needle valve 124 opens. When the needle valve 124 opens, the float chamber 111, the valve hole 127, and the conduit 23 communicate with each other, and the float chamber 111
The oil that has accumulated at the bottom of the engine is returned to the crank chamber. When the oil is released into the crank chamber and the oil level at the bottom of the float chamber 111 decreases, the needle valve 124 closes and stops releasing oil.

The internal space 129 of the float 121 is the tube 1
30 and a ventilation pipe 110, it is filled with a working gas free of oil components and is maintained at the same pressure as the float chamber 111. Therefore, the float 121 does not break even if placed under high pressure, and the internal space 129
Since oil does not enter the system, it can operate continuously.

As described above, conventional thin-wall type floats may break due to high pressure and cannot fulfill the role of floats. Alternatively, the float chamber 11 can be opened by simply providing a hole in the float 121.
If the pressure is the same as 1, oil will enter through the hole and the float will not function as a float.

According to the oil separator according to the present invention, since there is no pressure difference between the float internal space and the float external space, the float will not be destroyed no matter how high the pressure in the float chamber becomes, and the float internal space Because only working gas with no oil components enters the float, oil does not accumulate in the internal space of the float.

In the Stirling engine of the sealing device and gas separator according to the present invention, even under the action of extremely high working gas, the float in the gas separator will not be damaged at all, and the sealing device and gas separator will function normally, making it extremely practical. It is something like that.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram including a partial sectional view showing an embodiment of a sealing device for a Stirling engine according to the present invention, and FIG. 2 is an enlarged sectional view of an oil separator according to the present invention. 1: cylinder, 2: piston, 15: sealing device, 100: oil separator, 107: filter, 121: float, 124: needle valve.

Claims (1)

[Claims] 1 The oil separator of the Stirling engine separates the oil and gas of the gas and oil mixture released from the sealing device of the Stirling engine, and returns the oil to the crank chamber and the gas to the working space. It has a device for returning the separated oil to the crank chamber, and the device is composed of a float that responds to the oil level and a needle valve that is interlocked with the float, and the hollow part of the float is connected to a hose made of a flexible material. An oil separator for a sealing device of a Stirling engine, characterized in that the oil separator is in communication with the upper space of the filter.