JPS6338669A - Oil separating device for power engine - Google Patents

Abstract

PURPOSE:To prevent entrance of oil, by a method wherein oil in oil steam passing an oil separator located between a power piston and a crank chamber is separated by passage of the oil through a pipe for cooling through which to intercommunicated two spaces partitioned by a shield plate 29. CONSTITUTION:A power piston 15 for a stirling engine is coupled to a crank in a crank chamber through a power piston rod 14. An oil separator 23 adapted to prevent entrance of oil from a crank chamber to an actuating space above the power piston is situated between the power piston 15 and the crank chamber. Though oildrops are removed through a filterlike oil separator, oil steam passes, and since the oil steam produces oildrops in an upper space, a shield plate 29 is situated in order to remove the oildrops. A first space 30a above the shield plate 29 and a second space 30b are intercommunicated through a pipe 28 for cooling which is cooled during passage of it within a jacket 16a for cooling, and oil steam produces oildrops for recovery.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil separation device for a power engine that prevents lubricating oil from entering the working space of, for example, a Stirling engine or a non-lubricated compressor.

[Conventional technology]

In this specification, a case where the method is applied to a Stirling engine will be explained as an example.

FIG. 2 is a sectional view of a main part of a conventional Stirling engine which has the same structure as that shown in, for example, Japanese Patent Laid-Open No. 59-85457. In the figure, (1) is the crankcase, and all the parts of the Stirling engine are assembled based on this part. (2) is a flange that is fixed to a hole drilled in the crankcase (1) with fastening parts such as bolts, and (3) is a bearing housing that is fastened to the crankcase (1) in the same way as the flange (2). , (4
) is the flange fastened and fixed to the crankcase (1), (5) is the main bearing fixed to the bearing housing (3),
(6) is the main bearing fixed to the flange (2), (7) is the crankshaft, the main bearing (5) and the main iI! B [1st place (
It is held rotatably by 6) and transmits the power generated by the Stirling engine to the outside. (8) A mechanical seal attached to the beam rank shaft (7) to seal off the gas in the crankcase (1). (9) and 00 are balance weights for balancing the rotation of the crankshaft (7), which are fixed to the crankshaft (7).

In addition, Ql), ■ is a power piston connecting rod connected to the crankshaft (7) by a bearing, a3 is a power piston connecting rod α force, and a crosshead connected to (2) is connected to the power piston. The power rod α→ and the power piston α0 are connected. Also crosshead a3
The outer periphery of the cylinder 0Q is tightly fitted with the inner periphery of the cylinder 0Q so that it can slide back and forth with a bearing action.

The α force is applied to the displacer nozzle, and the crankshaft (7
) and are rotatably connected by bearings. (To) is the piston pin, and α Yu is the rod for the displacer. It is connected to the connecting rod α for the displacer using the piston pin 0 barrel as a contact point, and also passes through the cross head α, the power piston rod Q4, and the power piston Q5. and is fixedly connected to the displacer piston (1).

(C) is the lubricating oil collected at the bottom of the crankcase (1) to lubricate the moving parts of the Stirling engine, (Foundation) is the ring seal, and the trowel is the oil separator. The oil separator ■ is fixed to the crankcase αQ side, and slides into contact with the power piston rod α→ at its contact surface (28a).

Normally, the contact surface (213a) is made of something like a rod seal, and the outer periphery is made of a breathable filter-like material that filters out oil particles that come up from the crosshead α section. , the structure is such that oil particles do not enter into the moving capiston α pupil direction. Since the oil separator (to) allows gas to pass through, the crankcase (1) has the function of a buffer space.

Note that explanations of structural parts such as the combustor part and the heat exchanger part of the Stirling engine will be omitted. In addition, power piston αG, displacer piston (1) and cylinder 0
The space sealed at e is defined as the working space.

FIG. 3 is an enlarged sectional view showing the oil separator portion. @ is the piston ring attached to the power piston 0.9, (2
) is a rod seal and has a gas seal function. (
16a) is a cooling jacket for cooling the sliding heat generated by the piston ring (c) provided in the cylinder QQ section, and cooling water flows inside it. (1) is an oil separation space closed by a moving capiston αQ1 cylinder an and an oil separator). The power piston Q! is located in the oil separation space (1) below the dynamic piston QQ! Along with the reciprocating movement of 9, the crankcase (1
) gas flows in and out.

[]Problem that the invention seeks to solve]

In the conventional Stirling engine as described above, during operation, gas passes through the oil separator @ to enter and exit the oil separation space. When the power piston α moves upward, it moves from the inside of the crankcase (1) to the oil separation space (1), and when it moves downward, it moves from the oil separation space (to) to the crankcase (
1) When gas enters the oil separation space (1) from inside the crankcase (1), oil droplets are separated, but the oil vapor contained in the gas is separated. Passes through an oil separator (g). If the engine is operated for a long period of time in this state, as shown in Figure 3, it will condense and adhere to the surface inside the cooled cylinder αQ, and the condensed oil scum will also be deposited on the back surface of the power piston αQ and on the rear surface of the power piston αQ. It scatters and adheres to the raindrops. And finally, the piston ring (
c) Oil enters the operating space. As a result, oil adheres to a heat exchanger (not shown) and is carbonized by heat, resulting in a reduction in engine performance.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an oil separation device that can prevent oil from entering the working space of a power engine and prevent the performance of the power engine from deteriorating. shall be.

[Means for solving problems]

The oil separation device for a power engine of the present invention is provided in a cylinder in which a power piston moves reciprocally, through which a heat medium flows, and a cooling jacket is provided below the working piston to absorb heat generated by sliding of the power piston. , an oil separator that separates lubricating oil by allowing gas to pass through and preventing lubricating oil from passing through;
A baffle plate fixed to the cylinder between the power piston and the oil separator and formed with a gap between the power piston rod and a first baffle plate between the power piston and the baffle plate.
The space communicates with a second space between the shield and the oil separator, the cross-sectional area of the passage is larger than the gap area, and the oil vapor contained in the gas is cooled by the heat medium of the cooling jacket. It is equipped with a cooling pipe that condenses the oil and returns it to the oil separator.

[Effect]

In this invention, the gas containing oil vapor that has passed through the oil separator flows through the cooling pipe, and the gas containing oil vapor is cooled by the cooling pipe and the oil component is condensed. Oil vapor in gas can be separated.

Therefore, it is possible to prevent oil from entering the working space of the power engine, thereby preventing the performance of the power engine from deteriorating.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of the present invention. In the figure, (to) is the cooling pipe, and the cooling jacket (1
The inside of the cooling jacket (16a) is arranged in the form of a coil that wraps around the cylinder 00, and gas flows through the inside and water from the cooling jacket (16a) flows through the outside.

(28a) and (28b) are the openings of the cooling pipe, which are formed in the inner surface of the cylinder αQ, through which gas enters and exits. The shield plate is a shielding plate that is fixed to the inner circumferential side of the cylinder αQ, and is provided in a non-contact manner with the power piston rod (L) with a small gap (29a).The area S of the gap (29a) is: When the cross-sectional area of the openings (28a) and (28b) of the cooling pipe is 82, they are formed in the state of S2 >> Sl.

Note that not only the opening portion but also the passage cross-sectional area S2' of the cooling pipe (G) is S2'>> S l. (8
0a) is the first space surrounded by the power piston αG and the shielding plate, and (30b) is the second space surrounded by the shielding plate and the oil separator (to).

In the oil separator configured in this way, the power piston α
The volumes of the first space (80a) and the second space (30b) change as G moves up and down. That is, the power piston α
When 9 moves upward, the volume of the first space (30a) increases. At this time, the gas is in the second space ((capital) b)
The liquid flows further into the first space (30a). The gas is in the gap (29
a) and the first space (8 oa) through the cooling pipe.
However, as described earlier, Sz, S2'>>
Since it is set to S1, most of the gas flowing into the space (80a) will pass through the cooling pipe (to). Since it is cooled by water in the cooling pipe or cooling jacket (16a), the gas containing oil vapor flowing through the cooling pipe is also cooled, and the oil vapor in the gas is cooled by the water in the cooling pipe (support). ) is condensed on the internal walls and separated. Therefore, it is possible to prevent oil vapor from flowing into the first space (30a).

When the power piston moves downward, the liquefied oil droplets flow from the first space (30a) to the second space (3o).
b) downward oil separator I due to gas flow and gravity to
z3t will be returned. The returned oil droplets are retained in the oil separator because the oil separator is made of something like a porous sponge. When the oil droplets accumulate and become heavy, they fall due to gravity.

In the oil separation device of this embodiment, since it is possible to prevent oil vapor from entering the first space, it is also possible to prevent oil from entering the working space, thereby suppressing a decrease in the performance of the power engine.

In the above section, the cooling pipe (g) has a circular tube shape, but the same effect can be obtained even if the cooling pipe is provided with fins inside the pipe to improve the cooling effect. Furthermore, although water cooling has been described as a cooling method, similar effects can be achieved by using other refrigerants.

Further, in the above embodiments, the case where the present invention is applied to a Stirling engine has been described, but the same effect can be obtained even when the present invention is applied to other power engines such as a non-slip compressor.

〔Effect of the invention〕

As described above, according to the present invention, a cooling jacket is provided in a cylinder in which a power piston moves reciprocally, through which a heat medium flows, and absorbs heat generated by sliding of the power piston, and a cooling jacket is provided below the power piston. oil separators that separate lubricating oil by allowing gas to pass through and preventing lubricating oil from passing through;
a shield plate fixed to the cylinder between the power piston and the oil separator and formed with a gap between the power piston rod and a first shield plate between the power piston and the shield plate;
The space communicates with a second space between the shielding plate and the oil separator, and the cross-sectional area of the passage is larger than the gap area, and the oil vapor contained in the gas is cooled by the heat medium of the cooling jacket. By having a cooling pipe that condenses the oil and returns it to the oil separator, an oil separator for a power engine can be obtained that prevents oil from entering the power engine and prevents the performance of the power engine from deteriorating. There is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an oil separation device for a power engine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of essential parts of a Stirling engine to which a conventional example is applied, and FIG. It is an enlarged sectional view showing an oil separator part. In the figure, 04 is the power piston rod, Qυ is the power piston, Qe is the cylinder, (16a) is the cooling jacket, (g) is the oil separator, (to) is the cooling pipe, (28
a) (28b) is the opening of the cooling jacket, the shield is the shield plate, (29a) the gap between the shield plate (to) and the power piston rod On, (80a) is the first space, (30b)
is the second space. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. 1st figure 2J9 head &'Kotake JOb

Claims (1)

[Claims] A cooling jacket is provided in the cylinder in which the power piston moves reciprocatingly, through which a heat medium flows, and absorbs heat generated by sliding of the power piston.A cooling jacket is provided below the power piston to allow gas to pass through and lubricating oil to pass through. an oil separator for preventing and separating lubricating oil; a shield plate fixed to the cylinder between the power piston and the oil separator and formed with a gap between the power piston rod and the power piston rod; A first space between the shield plate and the oil separator is connected to a second space between the shield plate and the oil separator, and the cross-sectional area of the passage is larger than the gap area, and the oil is cooled by the heat medium of the cooling jacket and is contained in the gas. An oil separator for power engines equipped with cooling pipes that condense oil vapor and return it to the oil separator.