JP2001099505A - Gas compressing/expanding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of a cold heat storage material by impurities such as moisture and the like which are contained in operating gas. SOLUTION: An expanding space 34 is provided with an impurity removing device 40 for removing impurities contained in operating gas in the expanding space 34. The impurities removing device 40 is constituted of a plate member 41, provided at the top of a displacer 31, and an impurity removing agent 42, received in the plate member 41 and adsorbs the impurities or the like. According to this method, the cold heat storage material 33 will not be clogged by the impurities such as moisture or the like even when the operating gas flows through the cold heat storage material 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor / expander which compresses / expands a working gas while removing impurities contained in the working gas to generate cold heat.

[0002]

2. Description of the Related Art Conventionally, gas compressors / expanders have been used in Stirling refrigerators, Stirling engines, reciprocating compressors and the like.

[0003] The gas compressor / expander shown in FIG. 4 includes a driving unit 120 having a crank mechanism 122 and a displacer 13.
1 and a compression unit 150 provided with a compression piston 151.

The expansion section 130 includes an expansion cylinder 132 for accommodating a displacer 131 and an expansion space 13 provided on the head side (upper side in FIG. 4) of the expansion cylinder 132.
4. Insertion hole 1 for transmitting driving force to displacer 131
The load 112 is attached to the head of the expansion cylinder 132, including the displacer rod 135 inserted into the 59 a, the cold storage material 133 provided in the displacer 131, and the like.

[0005] The compression section 150 is provided with a compression piston 15.
1, a compression cylinder 152 for storing
The compression piston 153 is inserted through the compression space 153 and the insertion hole 159b provided on the head side (the upper side in FIG.
And a compression piston rod 158 for transmitting a driving force to the motor.

A gas passage G communicating with the insertion hole 159a is formed on the upper side surface of the compression cylinder 152.

In such a configuration, when the motor 121 is driven and the crank mechanism 122 rotates, the rotational power is transmitted to the compression piston 151 and the displacer 131, and the phase of the compression piston 151 is shifted with respect to the displacer 131. The reciprocating motion is delayed by about 90 degrees.

When the compression piston 151 moves from the bottom dead center to the top dead center, the working gas in the compression space 153 is compressed. During this time, the displacer 131 moves upward and reaches the top dead center, and then moves downward.

[0009] The working gas compressed along with the upward movement of the compression piston 151 flows through the gas flow path G and is sent to the expansion section 130 side. When the displacer 131 moves down, the working gas passes through the cold storage material 133. The heat is exchanged with the cold storage material 133 and sent to the expansion space 134.

As the displacer 131 reaches the bottom dead center, the compression piston 151 moves from the top dead center to the bottom dead center, and the working gas expands and cools down. Since the expansion process at this time is an isothermal expansion process, external heat is absorbed as much as the temperature is reduced by the expansion. That is, heat can be taken from the load 112.

As the compression piston 151 approaches the bottom dead center, the displacer 131 starts moving upward, the working gas passes through the displacer 131, absorbs heat from the cold storage material 133 and returns to the compression space 153.

By such a cycle, the compression space 15
The working gas compressed in 3 is supplied to the gas flow path G and the insertion hole 159a.
, Flows into the displacer 131, passes through the mesh-like cold storage material 133 provided in the displacer 131, flows into the expansion space 134, and expands.

The working gas expanded in the expansion space 134 follows the same path, and the displacer 131 and the insertion hole 159
a, flows into the compression space 153 via the gas flow path G.

[0014]

However, in the above configuration, since the cold storage material 133 is formed of a metal mesh, if the working gas contains impurities such as moisture and impurity gas, it is cooled and frozen. There was a problem that the mesh was clogged.

That is, the regenerator 133 is made of a metal such as stainless steel in a fine mesh (about 50 microns). Further, the working gas (for example, helium) may contain moisture, or a sliding portion such as a resin oil seal may be worn by a long operation, and an impurity gas may be generated at that time.

The working gas expands in the expansion space 134 and cools down, and flows through the cold storage material 133. At this time, the impurities P contained in the working gas freeze on the mesh as shown in FIG. Clogging, thereby increasing the flow resistance of the cold storage material 133 or reducing the heat exchange efficiency between the cold storage material 133 and the working gas, resulting in a decrease in the refrigeration efficiency of the gas compressor / expander. is there.

Accordingly, an object of the present invention is to provide a gas compression / expansion machine in which the refrigerating efficiency is suppressed by preventing the impurities such as moisture from clogging the regenerator.

[0018]

According to a first aspect of the present invention, there is provided a compression cylinder in which a compression piston is reciprocally provided in a compression cylinder, and the compression piston is formed by the compression cylinder and the compression piston. A compression part for compressing the working gas in the space and a displacer containing a regenerative material reciprocating reciprocating with a phase shift of about 90 degrees from the compression piston in the expansion cylinder are reciprocally provided, and formed by the expansion cylinder and the displacer The working gas compressed from the compression section flows into the expansion space, and the expansion section expands the working gas. An impurity removing device for removing impurities present is provided to prevent the impurities from clogging the regenerator material.

The invention according to claim 2 is characterized in that the impurity removing device has a dish member provided on the head of the displacer, and an impurity removing agent housed in the dish member and adsorbing impurities. I do.

The invention according to claim 3 is characterized in that the impurity removing device is provided on the inner wall of the expansion space.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a gas compression / expansion machine according to the present embodiment.

The gas compression / expansion device includes cranks 22a, 2
2b, a drive unit 20 having a crank mechanism 22, a dilation unit 30 with a displacer 31, a compression unit 50 with a compression piston 51, and the like. The expansion unit 30 and the compression unit 50 are driven side by side. It is provided on the upper part of the unit 20.

The drive section 20 includes a motor 21 for applying a rotational driving force to the crank mechanism 22, an oil tank 23 for storing oil for lubricating the crank mechanism 22, and a crank 22.
a, connecting rod 24a connected to 22b,
24b, and cross guides 25a and 25b connected to the connecting rods 24a and 24b.

The cranks 22a and 22b are connected eccentrically to the shaft 22c, and the mounting angles of the cranks 22a and 22b are set so that the phase of the compression piston 51 is delayed by about 90 degrees with respect to the phase of the displacer 31. Is set.

The expansion section 30 includes an expansion cylinder 32 for accommodating the displacer 31, an expansion space 34 provided on the head side (upper side in FIG. 1) of the expansion cylinder 32, and a displacer rod 35 for transmitting a driving force to the displacer 31. , A cold storage material 33 provided in the displacer 31
The load 12 is attached to the head of the expansion cylinder 32.

FIG. 2 is a detailed view showing the configuration of the expansion section 30.
On the side of the head of the displacer 31, there is formed a flow path 36 for the working gas that enters and exits the expansion space 34, and the head of the displacer 31 absorbs impurities P such as moisture and impurity gas contained in the working gas. There is provided an impurity removing device 40 for removing the impurities.

In the impurity removing device 40, an impurity removing agent 42 is placed in a dish member 41 having an opening on the load 12 side.

The compression section 50 covers a compression cylinder 52 for accommodating a compression piston 51, a compression space 53 provided on the head side (upper side in FIG. 1) of the compression cylinder 52, and an outer surface of the compression cylinder 52. Fins 54 for dissipating the heat of the working gas generated by the compression to the outside, the partition wall 55 provided on the drive section 20 side of the compression cylinder 52, and the insertion holes 59b formed in the partition wall 55. And a compression piston rod 58 for transmitting a driving force to the compression piston 51.

An insertion hole 59a is formed in the compression cylinder 52 and the partition wall 55 in parallel with the insertion hole 59b, and the displacer rod 35 is inserted through the insertion hole 59a.

Thus, the compression section 50 and the expansion section 30 can be disposed in the same direction, and the space occupied by the gas compression / expansion machine can be reduced.

A seal member 71 is inserted into an insertion hole 59b through which the compression piston rod 58 is inserted, and a seal member 73 is inserted into an insertion hole 59a through which the displacer rod 35 is inserted, so that oil is compressed. It does not enter the part 50 or the inflatable part 30.

Further, a gas flow path G communicating with the insertion hole 59a is formed on the upper side surface of the compression cylinder 52, and gas seals 72 and 74 are provided in the compression cylinder 52 and the displacer 31, respectively.

Next, the operation of the gas compressor / expander based on the above configuration will be described. When the crank mechanism 22 rotates, the rotational power is transmitted to the compression piston 51 and the displacer 31 via the connecting rods 24a, 24b, etc., and the compression piston 51 reciprocates with a phase delayed by about 90 degrees with respect to the displacer 31. Get to exercise.

When the compression piston 51 moves from the bottom dead center to the top dead center, the working gas in the compression space 53 is compressed. During this time, the displacer 31 moves upward and reaches the top dead center, and then moves downward.

The working gas compressed by the upward movement of the compression piston 51 flows through the gas flow path G and is sent to the expansion section 30 while being radiated by the radiation fins 54. When the displacer 31 moves down, the working gas passes through the cold storage material 33, exchanges heat with the cold storage material 33, and is sent to the expansion space 34.

As the displacer 31 reaches the bottom dead center, the compression piston 51 moves from the top dead center to the bottom dead center, and the working gas expands and cools down. Since the expansion process at this time is an isothermal expansion process, external heat is absorbed as much as the temperature is reduced by the expansion. That is, heat can be taken from the load 12.

As the compression piston 51 approaches the bottom dead center, the displacer 31 starts moving upward, the working gas passes through the displacer 31, absorbs heat from the cold storage material 33, returns to the compression space 53, and one cycle is completed.

In this cycle, if the working gas flowing into the expansion space 34 contains impurities P such as moisture and impurity gas, the cold storage material 33 is clogged.

Therefore, in the present invention, an impurity removing device 40 is provided on the expansion space 34 side to remove impurities P contained in the working gas by adsorption or the like.

At this time, since the impurity removing device 40 is not provided so as to close the flow path of the working gas flowing between the expansion space 34 and the cold storage material 33, there is no possibility of increasing the flow resistance of the working gas. .

In the above description, the case where the impurity removing device 40 is provided at the head of the displacer 31 has been described. However, the present invention is not limited to this. For example, as shown in FIG. It may be provided on the inner peripheral wall of the expansion cylinder 32 at 34 or on the expansion cylinder 32 on the load 12 side as shown in FIG.

[0042]

As described above, according to the first aspect of the present invention, an impurity removing device for removing impurities contained in the working gas in the expansion space is provided in the expansion space. The cold storage material is not clogged, and a decrease in refrigeration efficiency can be suppressed.

According to the second aspect of the present invention, a dish member provided on the head of the displacer includes an impurity removing device;
Since it is constituted by the impurity remover which is accommodated in the dish member and adsorbs impurities, it is possible to prevent the impurities from clogging the cold storage material with a simple structure and to suppress a decrease in refrigeration efficiency. .

According to the third aspect of the present invention, since the impurity removing device is provided on the inner wall of the expansion space, it is possible to prevent impurities from clogging the cold storage material with a simple configuration and to suppress a decrease in refrigeration efficiency. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas compression / expansion machine applied to the description of a first embodiment.

FIG. 2 is a detailed view of an expansion portion of FIG.

FIG. 3 is a detailed view of an expansion section instead of FIG. 2;

FIG. 4 is a cross-sectional view of a gas compression / expansion machine applied to the description of the related art.

FIG. 5 is a detailed view of an inflating section of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 expansion section 31 displacer 32 expansion cylinder 33 cold storage material 34 expansion space 40 impurity removing device 41 dish member 42 impurity remover 50 compression section 51 compression piston 52 compression cylinder 53 compression space

Claims (3)

[Claims] 1. A compression section in which a compression piston is reciprocally mounted in a compression cylinder to compress a working gas in a compression space formed by the compression cylinder and the compression piston; A displacer containing a regenerative material that reciprocates with a phase shift of approximately 90 degrees is provided reciprocally, and the compressed working gas from the compression section flows into an expansion space formed by the expansion cylinder and the displacer. A gas compression / expansion device having an expansion portion for expanding the gas, wherein an impurity removal device is provided in the expansion space to remove impurities contained in the working gas in the expansion space. Gas compression / expansion machine. 2. The apparatus according to claim 1, wherein the impurity removing device includes a dish member provided on a head of the displacer, and an impurity removing agent housed in the dish member and adsorbing impurities. The gas compression / expansion machine according to claim 1, wherein the gas compression / expansion machine is provided. 3. The gas compression / expansion machine according to claim 1, wherein said impurity removing device is provided on an inner wall of said expansion space.