JP3363653B2 - Stirling refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling refrigerator, and more particularly to a Stirling refrigerator configured to reduce wear of sliding parts.

[0002]

2. Description of the Related Art As a Stirling refrigerator, for example, working gases such as helium, nitrogen and air enclosed in cylinders 1 and 2 which are installed with their directions shifted by 90 degrees as shown in FIG. By the reciprocating motion of the moving pistons 3 and 4, the steps of isothermal compression, isothermal heat dissipation, isothermal expansion, and isothermal heat reception are repeated, and the cylinder chamber of the cylinder 1 (hereinafter,
It is well known that a plurality of coolers 7 each having one end communicating with an expansion chamber 5) are provided to perform a required cooling action.

In the Stirling refrigerator shown in FIG. 2, when the piston 3 slides downward in the drawing, the piston 4 slides leftward in the drawing, and when the piston 3 slides upward in the drawing, the piston 4 slides upward. It slides to the right in the drawing.

An expansion chamber 5 for expanding the working gas,
A cylinder chamber (hereinafter, referred to as a compression chamber) 6 of the cylinder 2 that compresses the working gas communicates with each other through a cooler 7, a regenerator 9, and a connecting pipe 10, and at the base side of the cylinder 1 and the cylinder 2. Cooling fins 12 or 13 on the head side
Is provided, and the working gas sealed in the cylinder repeats the isothermal compression, isothermal heat dissipation, isothermal expansion, and isothermal heat receiving steps by the reciprocating motion of the pistons 3 and 4.

That is, in the illustrated Stirling refrigerator, when the piston 3 moves downward in the drawing and the piston 4 moves leftward in the drawing, the cooling fan 14 generates heat in the compression chamber 6 when the working gas is compressed. An isothermal compression process is performed in which heat is radiated to the atmosphere to be supplied via the cooling fins 13, and an isothermal expansion process is performed in the expansion chamber 5 in which the temperature drop during expansion of the working gas is supplemented by the heat supplied from the surroundings via the cooler 7. In addition, the working gas extruded from the compression chamber 6 radiates heat to the atmosphere via the cooling fins 12, and then is cooled by the regenerator 9 and guided to the expansion chamber 5 at the same time.

When the piston 3 moves upward in the drawing and the piston 4 moves rightward in the drawing, the expansion chamber 5
The working gas extruded from the cooling chamber 9 is configured to perform an equal volume heat receiving process in which it is guided to the compression chamber 6 while cooling the regenerator 9.

Reference numeral 15 is a charging port for charging the working gas into the machine, and the charging port 15 is piped and connected so as to communicate with the crank chamber 16 via the connecting pipe 11. The working gas filled in the crank chamber 16 from the filling port 15 passes through the gap between the cylinder 1 and the piston 3 and the gap between the cylinder 2 and the piston 4, fills the expansion chamber 5 and the compression chamber 6, and fills the pistons 3 and 4. It is configured so that there is no pressure difference between both ends.

In the conventional Stirling refrigerator, the rotation of the crankshaft 21, which is rotated by a prime mover (not shown) as shown in FIG. 3, cooperates with the connecting rod 41 to reciprocate the piston 3 (or 4). The cross guide rod 42 to be converted is press-fitted into the inner surface of the cross guide 43 which is softer than the cross guide rod 42, for example, L
It is configured to slide on the lining metal 44 made of BC-3 (lead bronze casting).

Reference numeral 17 in the drawing denotes an oil pump provided in the crank chamber 16, the starting end of which is the oil pump 17.
Of the first oil supply passage 23, which communicates with the discharge side of the crankshaft 21 and has a terminal end opened to the metal housing 26 of the bearing 25, and the first oil supply passage 23.
A mechanical seal 2 having a starting end opened to a groove 26a continuously recessed in the inner peripheral surface of the metal housing 26 facing the end of the crankcase 16 and the end closing the crank chamber 16 from the outside of the machine.
Lubricating oil discharged from the oil pump 17 can be supplied to the bearing 25 and the mechanical seal 27 via a second oil supply passage 29 that opens toward the valve 7. The second oil supply passage 29 is formed so as to be inclined so as to be separated from the inner peripheral surface of the metal housing 26 toward the end side.
In addition, several pieces are formed around the crankshaft 21 at equal intervals.

[0010]

In the conventional Stirling refrigerator having the above-mentioned structure, since the sliding cross guide rod side is harder than the lining metal press-fitted into the cross guide, this lining metal is the cross guide rod. However, there is a problem that the edge portion is scraped off and uneven wear is caused and the durability is low, and there has been a problem to solve these problems.

[0011]

According to the present invention, working gas enclosed in a cylinder as described above is isothermally compressed, isothermally radiated, isothermally expanded and isothermally received by the operation of a piston sliding in the cylinder. In a Stirling refrigerating machine that repeats the process and performs a required cooling action by a cooler attached to the expansion chamber side of the cylinder,

A sliding metal member, which is softer than the cross guide, is arranged on the side surface of the cross guide rod that converts the rotation of the crankshaft in cooperation with the connecting rod into the reciprocating motion of the piston and faces the cross guide. The first configuration according to

In the above first structure, a second structure in which the sliding metal member is divided into front and rear parts, and

In the first or second configuration, there is provided a third configuration in which the sliding metal member is fixed so as not to fall off by a pressing plate installed so as to intersect the axial direction of the cross guide rod. By doing so, the above problems can be solved.

[0015]

Since the sliding metal member, which is softer than the cross guide, is arranged on the side surface of the sliding cross guide rod, uneven wear of the metal member is reduced and durability is improved.

Further, in the Stirling refrigerator of the second aspect, since the sliding metal member is divided and arranged in front of and behind the side surface of the cross guide rod, there is an effect of reducing sliding resistance.

Further, in the Stirling refrigerator having the structure according to the third aspect of the invention, since the pressing plate fixes the sliding metal member, the sliding metal member falls off even if it receives an axial force from the cross guide during operation. There is nothing to do.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that, in FIG. 1, the portions denoted by the same reference numerals as those in FIGS. 2 and 3 have the same functions as those described with reference to FIGS. 2 and 3, and do not hinder the understanding of the present invention. The explanation is omitted here.

45a and 45b are cross guide rods 4
2 is a sliding metal member that is dividedly arranged on the front and back of the side surface facing the cross guide 43, and is made of a material softer than the SUS-304 cross guide 43, for example, LBC-3 (lead bronze casting). There is.

The sliding metal member 45a is fitted into the small-diameter portion of the side surface of the cross guide rod 42 from above in the drawing, and then fixed by a pressing plate 47a fixed with a countersunk screw 46 from above in the drawing, and the sliding metal member 45b. Is
The cross guide rod 42 is fitted into the small-diameter portion on the side surface from below in the drawing, and then fixed by a pressing plate 47b fixed by a countersunk screw 46 from below in the drawing so that it does not fall off even if it receives an axial force from the cross guide 43. It has become.

That is, in the Stirling refrigerator of the present invention, since the soft sliding metal members 45a and 45b are arranged on the side surface of the sliding cross guide rod 42, the soft lining metal 44 is cross-guided. Like a conventional Stirling refrigerator configured by press-fitting the entire inner surface of 43, the edge portion of the sliding hard cross guide rod 42 scrapes the soft lining metal 44 unevenly to cause uneven wear, I have never said that it would impair durability.

Further, since the cross guide rod 42 can be manufactured by processing the outer surface, it is easier to manufacture than the conventional Stirling refrigerating machine in which the soft lining metal 44 is press-fitted on the inner peripheral surface of the cross guide 43, and the processing accuracy is high. Improved.

Further, soft sliding metal members 45a, 45
Since b is divided and arranged at the front and rear of the side surface of the cross guide rod 42, there is also an advantage that the sliding resistance is small.

Since the present invention is not limited to the above embodiments, various modifications can be made without departing from the spirit of the claims.

[0025]

As described above, according to the present invention, the working gas enclosed in the cylinder is compressed isothermally, radiated isothermally and expanded isothermally by the operation of the piston sliding in the cylinder.
In a Stirling refrigerator that performs a required cooling action by a cooler provided in communication with the expansion chamber of the cylinder by repeating a process of receiving heat of equal volume, the reciprocation of the piston by the rotation of a crankshaft in cooperation with a connecting rod. Since a sliding metal member that is softer than this cross guide is arranged on the side surface of the cross guide rod that is converted into operation to face the cross guide, the sliding metal member is less likely to be unevenly worn and durability is improved. did.

Further, since the cross guide rod can be manufactured by processing the outer surface, not only is it easier to manufacture than the conventional Stirling refrigerator in which a soft lining metal is press-fitted into the inner peripheral surface of the cross guide, but also the processing accuracy is improved. It has the feature of being improved.

Further, in the Stirling refrigerator of the second construction, the contact area with the cross guide is reduced, so that the sliding resistance can be greatly reduced.

Further, in the Stirling refrigerator having the structure according to the third aspect of the present invention, since the pressing plate fixes the sliding metal member, the sliding metal member falls off even if it receives an axial force from the cross guide during operation. There is nothing to do.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part of one embodiment.

FIG. 2 is an explanatory diagram of a Stirling refrigerator.

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

1/2 cylinder 3.4 Piston 5 expansion chamber 6 compression chamber 7 cooler 9 regenerator 10 ・ 11 Connection pipe 12 ・ 13 Cooling fin 14 Cooling fan 15 Filling port 16 crank chambers 17 Oil pump 21 crankshaft 23 First oil supply path 25 bearings 26 Metal Housing 26a groove 27 Mechanical seal 29 Second oil supply path 30 oil return hole 41 connecting rod 42 Cross guide rod 43 Cross Guide 44 Lined metal 45a ・ 45b Sliding metal member 46 flat head screw 47a / 47b Press plate

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Claims (3)

(57) [Claims] 1. A process of isothermal compression, isothermal heat dissipation, isothermal expansion, and isothermal heat reception is repeated by a reciprocating motion of a piston in which a working gas enclosed in a cylinder slides in the cylinder, and a process is performed on the expansion chamber side of the cylinder. In a Stirling refrigerator that performs a required cooling action by an attached cooler, the side facing the cross guide of the cross guide rod that converts the rotation of the crankshaft in cooperation with the connecting rod into the reciprocating motion of the piston, A Stirling refrigerator having a sliding metal member softer than the cross guide. 2. The Stirling refrigerator according to claim 1, wherein the sliding metal member is arranged so as to be divided into front and rear parts. 3. The Stirling refrigerator according to claim 1, wherein the sliding metal member is fixed so as not to fall off by a pressing plate installed so as to intersect the axial direction of the cross guide rod.