JPH09287568A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve compression efficiency by keeping advantage of a compresor adopting bellows while reducing dead volume in a compression space. SOLUTION: A compressor has a case 2, a piston 3 which reciprocates inside a cylinder 2d in the case 2, driving means 4, 5, 7 which are arranged inside the case 2 and reciprocably drive the piston 3, a driving chamber in which the driving means 4, 5, 7 are housed, a supporting member 16 which is arranged on the piston 3 at its side of a back surface 3a, a circular flexible member 8 which is airtightly connected between the back surface 3a of the piston 3 and the supporting member 16, and a compression chamber 9 formed by the front end 3b of the piston 3. Inner space of the circular flexible member 8 is communicated with the driving chamber 10. Outer space of the flexible member 8 is airtightly interrupted from the driving chamber 10. The compression chamber 9 is shut off from being communicated with the outer space of the flexible member 8 by means of a clearance seal between the piston 3 and the cylinder 2d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly to a compressor using a flexible member such as a bellows.

[0002]

2. Description of the Related Art Conventionally, a compressor using a bellows is disclosed in JP-A-58-150001. This will be described with reference to FIG.

In the figure, a cooling blower 51 is connected to a case 52. In the internal space of the case 52,
A crank chamber 53 and a drive chamber 54 that is airtightly partitioned from the crank chamber 53 are formed. In the crank chamber 53, a crank 55 and a guide piston 56 connected to the crank 55 and reciprocating in the crank chamber 53 are arranged. The guide piston 56 further includes a piston rod 57.
The piston rod 57 is connected to the crank chamber 5
3 protrudes from the upper part of the drawing and extends to the drive chamber 54.

In the drive chamber 54, a first bellows 58 and
A second bellows 59 having a smaller diameter than the first bellows 58 is concentrically arranged.
Is connected to the piston rod 57 at the lower end surface in the figure.
The lower end of the compression chamber A shown in the drawing, which is formed in a space surrounded by the first bellows 58 and the second bellows 59, is closed, and the upper end of the compression chamber A shown in the drawing is a suction port for taking in gas from the outside. A valve 60 and a discharge valve 61 for discharging gas to the outside are arranged.

In the compressor having the above structure, the crank 55
When is rotated, the guide piston 56 and piston rod 5
7. The first bellows 58 and the second bellows 59 reciprocate. At this time, when the guide piston 56 moves upward in the drawing, the gas pressure in the compression chamber A becomes high, and the working gas in the compression chamber A is discharged from the discharge valve 61 to the outside. When the guide piston 56 moves downward in the drawing, the gas pressure in the compression chamber A becomes low, and the gas is sucked into the compression chamber A from the suction valve 60. At this time, the air blown from the blower 51 is
The compression chamber A is cooled from both sides through the outside of the first bellows 58 and the inside of the second bellows 59. In this way, the gas is discharged from the discharge valve 61 and functions as a compressor.

[0006]

A compressor using a bellows compresses a compression chamber in which a working gas is enclosed and a drive chamber in which a drive engine such as a crank is arranged by air-tightly separating the compression chamber by a bellows. There is an advantage in preventing indoor pollution. However, the conventional compressor has the following drawbacks. That is, when the space in the compression chamber is compressed, the bellows forming the compression chamber wall is in a contracted state. At this time, the adjacent peaks or valleys in the bellows do not come into contact with or adhere to each other, and have a certain gap. Therefore, this gap becomes a dead volume in the compression space. In order to improve the compression efficiency of the compressor, it is necessary to reduce the dead volume of the compression space, but in the conventional bellows compressor, the gap formed between the peaks or valleys of the bellows described above is removed. However, there was a limit to improvement of compression efficiency.

Therefore, the present invention has been made in view of the above circumstances, and it is possible to reduce the dead volume of the compression space and improve the compression efficiency while maintaining the advantages of the compressor using the bellows. This is a technical subject of the present invention.

[0008]

In order to solve the above-mentioned technical problem, the technical means taken in claim 1 of the present invention is to reciprocate between a case and a cylinder portion arranged inside the case. A moving piston, a driving means arranged inside the case for reciprocatingly driving the piston, a driving chamber in which the driving means is arranged, a support member arranged on the rear surface side of the piston, and a rear surface of the piston. Section and the support member are airtightly connected, and each include an annular flexible member that is expandable and contractable in the reciprocating direction of the piston, and a compression chamber formed in a space on the front surface side of the piston, The inner space of the flexible member communicates with the drive chamber, the outer space of the flexible member is airtightly isolated from the drive chamber, and the compression chamber is closed by the clearance seal between the piston and the cylinder portion. Resides in that the compressor, characterized in that the communication between the space outside of the member is blocked.

The operation of the above technical means is as follows. That is, when the piston reciprocates, the inner space of the flexible member communicating with the drive chamber is airtightly isolated from the outer space of the flexible member. Further, the compression chamber formed in the space in the front surface of the piston has a clearance seal that blocks communication with the outer space of the flexible member.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic partial sectional view of a compressor showing a first embodiment of the present invention.

In the figure, a compressor 1 has an outer shell formed by a case 2. The case 2 includes a case body 2a having an open end, a flange portion 2b connected to the open end portion of the case body 2a, and a lid portion 2c inserted into an inner peripheral hole of the flange portion 2b. A piston 3 is arranged inside the case 2. One end of a piston rod 4 is connected to the rear surface 3a side of the piston 3, and the other end of the piston rod 4 is connected to a crank pin 6 provided on a crank portion of a crank shaft 5. The crankshaft 5 is
Similarly, the output shaft 7 of the motor 7 arranged inside the case 2
a. Therefore, the motor 7 drives to drive the output shaft 7
When a rotates, the rotation is transmitted to the crankshaft 5, and the crankshaft 5 converts the rotational movement into reciprocating movement and transmits it to the piston rod 4. Therefore, the piston 3 connected to the piston rod 4 reciprocates.

A flange portion 2b forming a part of the case 2
Has an extending portion 2d whose one end extends inside the case 2, and an annular support member 16 is connected and fixed to the end portion. An annular bellows 8 is airtightly connected between one end surface of the support member 16 and the back surface portion 3a of the piston 3. A hole 16a is provided at the center of the support member 16, and the piston rod 4 is inserted into the hole 16a. Here, since the piston 3 reciprocates on the inner surface of the extending portion 2d, the extending portion 2d corresponds to the cylinder portion in the present invention.

The space on the front face 3b side of the piston 3 forms a compression chamber 9 for compressing the working gas. In addition, reference numeral 1
The inner space of the bellows 8 shown by 7 communicates with the drive chamber 10 in which the crankshaft 5 and the like are arranged via a hole 16a. Furthermore, the outer space 18 of the bellows 8 is
This auxiliary chamber 11 communicates with the compression chamber 9 via the clearance 12 between the piston 3 and the extending portion 2d. The clearance 12 is formed with a gap of about 10 to 20 μm. With a clearance as small as this, the working gas in the compression chamber 9 does not flow into the auxiliary chamber 11 through the clearance 12 when the piston 3 reciprocates, and the compression chamber 9 and the auxiliary chamber 11 are shut off from each other. It will be in the state of being. Such a configuration is called a clearance seal.

The compression chamber 9 communicates with a working gas suction / discharge passage 14 through a first passage 13 provided in the lid 2b.

In the compressor 1 having the above structure, the piston 3
Is moved to the left in the drawing, the annular bellows 8 expands, the space in the compression chamber 9 is compressed, and the working gas is discharged from the suction / discharge passage 14 via the first passage 13.
When the piston 3 moves to the right in the figure, the annular bellows 8 contracts and the space inside the compression chamber 9 expands,
The working gas is sucked into the compression chamber 9 from the suction / discharge passage 14 through the first passage 13. Although not shown, a suction passage and a discharge passage are provided in front of the suction / discharge passage 14, and a one-way valve is provided in the suction and discharge passages. Thereby, it is possible to continuously discharge the gas in the discharge passage.

During the reciprocating movement of the piston 3, the compression chamber 9 is blocked from the auxiliary chamber 11 by the clearance seal, and the airtightness is maintained. The gap 15 formed between the peaks or valleys of the bellows 8 is located on the auxiliary chamber 11 side. Therefore, the gap 15 formed between the peaks or valleys of the bellows 8 is excluded from the compression space. Therefore, it is possible to prevent an increase in dead volume due to these and improve the compression efficiency. Further, the inner space of the bellows 8 communicating with the drive chamber 10 and the auxiliary chamber 11 are airtightly partitioned by the bellows 8. Therefore, the compression chamber 9 and the drive chamber 10 are also airtightly partitioned. There is no possibility that dust or the like in 10 will mix into the compression chamber 9 and contaminate the working gas in the compression chamber 9.

[0018]

The invention of claim 1 has the following effects.

When the piston reciprocates, the inner space of the flexible member communicating with the drive chamber is airtightly isolated from the auxiliary chamber formed by the outer space of the flexible member. Further, the compression chamber formed in the space of the front surface of the piston is blocked from communicating with the auxiliary chamber by a clearance seal. Therefore, the gap formed between the peaks or valleys of the flexible member is excluded from the compression space. Therefore, it is possible to prevent an increase in dead volume due to these and improve the compression efficiency. Further, since the compression chamber is separated from the drive chamber by the bellows, dust and the like in the drive chamber does not enter the compression chamber and contaminate the compression chamber. .

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view of a compressor according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of a compressor according to the related art.

[Explanation of symbols]

1 compressor 2 case, 2a case body, 2b flange part, 2c lid part 2d extension part (cylinder part) 3 piston 4 piston rod (driving means) 5 crankshaft (driving means) 7 motor (driving means) 8 bellows ( Ring-shaped flexible member) 9 Compression chamber 10 Drive chamber 11 Auxiliary chamber 12 Clearance 15 Gap formed between the peaks or valleys of the bellows 16 Support member 17 Inner space 18 Outer space

Claims (1)

[Claims] 1. A case, a piston arranged inside the case for reciprocating a cylinder portion in the case, a driving unit arranged inside the case for reciprocatingly driving the piston, and the driving unit are arranged. A drive chamber, a support member arranged on the back surface side of the piston, and an annular flexible ring that is airtightly connected between the back surface of the piston and the support member and is expandable and contractible in the reciprocating direction of the piston. A flexible member and a compression chamber formed in a space on the front surface side of the piston are provided, an inner space of the flexible member communicates with the drive chamber, and an outer space of the flexible member is airtight with the drive chamber. The compressor is characterized in that communication between the compression chamber and the outer space of the flexible member is blocked by a clearance seal between the piston and the cylinder portion.