JP2599737Y2 - Rotary compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor in which when a compressing section compresses a fluid to be compressed, pressure balances applied to both sides of the compressing section are substantially equalized.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional rotary compressor used for an air conditioner for a vehicle or the like has a compression section P, a suction section I and a discharge section O in a casing 1. As shown in FIG.
And

The compression section P holds the cylinder 2 in the casing 1 between the front side block 4 and the rear side block 5 and tightens and fixes it with a tightening bolt (not shown).
As shown in FIGS. 4 and 5, the rotor unit 6 is housed.
The rotor portion 6 has a rotor main body 7 and a slide vane 8 and is rotatably provided in a state in which a part thereof is close to an inner peripheral surface 3a of the oval-shaped bore 3. Five vane grooves 9 are formed radially in the rotor body 7, and slide vanes 8 are provided in the vane grooves 9 so as to be able to come and go.

The suction section I is located on the left side of the casing 1 in the drawing, and is separated from the compression section P by the side block 4. A fluid to be compressed such as a relatively low-pressure refrigerant flows into the suction portion I, and the fluid to be compressed is guided into a compression chamber C formed in the bore 3 of the cylinder 2 of the compression portion P. I have.

[0005] The discharge portion O is located on the right side of the casing 1 in the drawing, is partitioned from the compression portion P by a side block 5 in the casing 1, and discharges the fluid to be compressed compressed in the compression chamber C. It has become so.

In a rotary compressor, power from a drive source (not shown) is transmitted to a shaft 10 via an electromagnetic clutch Cl. When the shaft 10 rotates the rotor section 6, the slide vanes 8 move the vane grooves 9 by centrifugal force or the like. And slides along the inner peripheral surface 3a of the bore 3,
The volume of the compression chamber C defined by the space between the slide vanes 8 and the inner peripheral surface 3a of the bore 3 changes with the rotation of the rotor section 6, and flows into the suction section I from the inflow port 11 of the casing 1. The fluid to be compressed sucked into the compression section P through the suction port 12 opened in the front side block 4 is compressed.

[0007] The compressed fluid to be compressed is discharged from a discharge port formed in the cylinder 2 to a discharge portion O against a discharge valve (none of which is shown). 14 to the outside.

A vane back pressure chamber 9 is provided at the base of the vane groove 9.
a is formed, and the pressure of the fluid to be compressed causes the vane back pressure chamber 9
The lubricating oil guided to a gives an appropriate back force in the direction of pushing the vane 8 out of the vane groove 9, so that the vane 8 slides smoothly along the inner peripheral surface 3 a of the bore 3. In addition,
The lubricating oil stored in the casing 1 is guided to the vane 8 and the bearing portion by the pressure of the fluid to be compressed.

[0009]

[Problems to be Solved by the Invention] As described above, the compression unit P
On the other hand, in a rotary compressor in which a low-pressure suction section I and a high-pressure discharge section O are distributed to both the left and right sides, compression is performed in a compression section P, and the compression section P is compressed more than the pressure in the suction section I.
When the internal pressure increases, the front side block 4 bends toward the suction portion I, and the clearance between the cylinder 2 and the front side block 4 increases by the amount of the bend.

When the clearance becomes large, the fluid to be compressed causes an internal leak in the compression portion P, which causes a reduction in compression performance. In addition, the amount of deflection is
Is proportional to the pressure difference between the pressure in the compression unit P and the pressure in the compression unit P. Therefore, the larger the discharge pressure of the compression unit P, the larger the pressure and the larger the clearance.

However, since the lubricating oil pressurized by the fluid to be compressed is guided to the vane back pressure chamber 9a in the radially inner portion of the rotor portion 6 and is in a relatively high pressure state, there is a possibility of bending. Is less.

In Japanese Utility Model Laid-Open Publication No. 53-150,518, a high-pressure refrigerant pressure accumulating chamber is provided in the vane back pressure chamber 9a, and the suction section I and the discharge section O are connected via the high-pressure refrigerant accumulating chamber. Although the communication is disclosed, this is only to provide a high-pressure refrigerant pressure accumulating chamber for the back pressure of the vane, and is not intended to prevent the clearance caused by the deflection of the side block 4 due to the pressure fluctuation during compression. Absent.

Japanese Utility Model Application Laid-Open No. 54-120,709 discloses a system in which a low-pressure gas chamber and a high-pressure gas chamber are connected to each other by a lubricating oil separating chamber, which improves lubricating oil supply. It is for.

The present invention has been made in view of the above-mentioned problems of the prior art, and is designed to prevent the high-pressure compressed fluid compressed by the compression section from bending the side block. It is an object of the present invention to provide a rotary compressor configured to guide a high pressure of a fluid to be compressed to a suction portion corresponding to a zone for compressing a fluid.

[0015]

In order to achieve the above object, according to the present invention, a rotor portion is provided in a cylinder sandwiched between both side blocks, and a compressed fluid such as a refrigerant is supplied by rotation of the rotor portion. A compression section for compressing, a suction section for introducing the fluid to be compressed into the compression section, and a discharge section for discharging the fluid to be compressed compressed by the compression section are provided in the casing. In a rotary compressor in which a casing is partitioned and a suction part is located on one side of the compression part and a discharge part is located on the other side, the suction part corresponding to a zone for compressing a fluid to be compressed in the compression part is provided in the rotary part. the high pressure fluid to be compressed in Rutotomoni in said discharge portion is provided a high-pressure chamber pressure fluid to be compressed is introduced in the discharge portion
A pressure guiding passage leading into the high pressure chamber is formed in the casing.
And introduced into the high-pressure chamber through the pressure guiding passage.
Side where high-pressure compressed fluid separates the compression section and the suction section
A rotary compressor wherein a block is configured to be pressurized toward the compression section.

[0016]

In this way, when the compression action is performed in the compression section, the high pressure of the fluid to be compressed is guided also to the suction section, so that the difference between the pressures applied to both side blocks inside and outside the compression section. Is almost eliminated, and there is no possibility that the side block is bent, so that the generation or increase of the clearance due to the bent side block can be prevented, and a decrease in the compression capacity can be prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an entire rotary compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a main part of FIG. 1, FIG. 3 is a pressure inside a compression chamber accompanying rotation of the rotor section. 6 is a graph showing a fluctuating state, in which members common to those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof is partially omitted.

As shown in FIG. 1, the rotary compressor includes a compression section P, a suction section I and a discharge section O in a casing 1.
And

The compression portion P is a portion in which the cylinder 2 is sandwiched between the front side block 4 and the rear side block 5 in the closed casing 1.
As shown in FIGS. 1 and 2, a rotor portion 6 is housed in the bore 3, and by rotating the rotor body 7 and the five slide vanes 8, the vanes 8 protrude and retract from the rotor body 7 so that a compression chamber is formed. The fluid to be compressed in C is compressed.

The suction section I is separated from the compression section P by a side block 4, and is located on the left side of the compression section P in the casing 1. Further, the discharge part O is partitioned from the compression part P by the side block 5, and the compression part P in the casing 1 is formed.
It is located on the right side.

As shown in FIGS. 2 and 3, the compression by the compression section P is performed when the rotor section 6 rotates about 75 degrees at the center angle θ with respect to the horizontal center line OO. The rear end side vane of the compression chamber C partitioned by the adjacent vane starts compression of the fluid to be compressed sucked into the compression section P through the suction port 12.

[0023] Thus, in this embodiment, the outer peripheral surface of the inner circumferential surface 3a and the near contact portion of the bore 3 of the rotor portion 6 central angle θ from a position of substantially 75 degrees in the compression chamber C, up to a so-called contact points A high-pressure chamber 20 is provided in the suction section I corresponding to a compression zone S (a portion indicated by a broken line in the figure) between the suction section I and the discharge section O in the high-pressure chamber 20. A pressure guiding passage 21 is provided through the cylinder 2, the front side block 4 and the rear side block 5 so that the compressed high pressure of the compressed fluid is introduced.

In this rotary compressor, since there are two compression chambers C, two high-pressure chambers 20 and two pressure-guiding passages 21, although not shown, are also provided.

Next, the operation of the embodiment will be described.

When the rotor section 6 is rotated via a shaft 10 by a drive source (not shown), the slide vanes 8 protrude from the vane grooves 9 by centrifugal force and an appropriate back force.
It slides along the inner peripheral surface 3a of the bore 3. Then, the refrigerant flowing from the inflow port (not shown) of the casing 1 is introduced into the compression chamber C through the suction port 12 opened in the front side block 4.

Since the volume of the compression chamber C changes with the rotation of the rotor section 6, the refrigerant sealed therein is compressed, and after being compressed, is discharged from the discharge port opened in the cylinder 2 to the discharge valve. Oil separator 1
After colliding with No. 3, it flows out from the outlet 14 to the outside.

[0028] In this compression step, in the present embodiment, the high pressure of the compressed fluid discharged into the discharge unit O is through the cylinder 2, the front side block 4 and a rear side block 5 pressure introducing path 21 penetrating the pressure It is introduced into the chamber 20. Therefore, the pressure in the high-pressure chamber 20 provided on the suction section I side, the pressure in the compression section P, and the pressure in the discharge section O are substantially balanced, and the front side block 4 is Does not bend.

For this reason, the clearance between the cylinder 2 and the front side block 4 does not increase, and the fluid to be compressed may cause an internal leak in the compression section P and the compression performance may be reduced. Absent.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the claims for utility model registration.

For example, in the above embodiment, the high pressure chamber 2 is provided in the suction section I corresponding to the compression zone S between the position where the center angle θ in the compression chamber C is approximately 75 degrees and the contact point.
0, but not limited to this, the high-pressure chamber 20 may be provided in a wider area in the suction part I.
The high-pressure chamber 20 may be provided in a narrower area, for example, in a region where the fluid to be compressed pushes the discharge valve by the rotation of the rotor unit 6 and is discharged (a region where the pressure in the compression chamber is equal to or higher than Pv in FIG. 3). .

Further, in the present invention, the cylinder and both side blocks may be made of any material, but in particular, it is relatively deformable, such as aluminum or its alloy, which is recently used for weight reduction. If the high-pressure chamber 20 is provided in a compressor using a material which is easy to perform, a more remarkable effect can be expected.

[0033]

As described above, according to the present invention, since the high pressure of the fluid to be compressed is guided also to the suction side of the side block, there is almost no pressure difference inside and outside the compression zone of the compression chamber. Deflection is prevented, and the accompanying increase in clearance in the compression chamber can be prevented, thereby preventing a reduction in compression capacity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a graph showing a pressure fluctuation state in a compression chamber accompanying rotation of a rotor unit.

FIG. 4 is a sectional view showing a conventional rotary compressor.

FIG. 5 is a schematic sectional view taken along line 5-5 in FIG.

[Explanation of symbols]

1 ... casing, 2 ... cylinder, 3 ... bore, 4 ... front side block, 5 ... rear side block,
6 ... rotor part, 20 ... high pressure chamber,
I: suction unit, O: discharge unit,
P: compression unit.

Claims (1)

(57) [Scope of request for utility model registration] A rotor (6) is provided in a cylinder (2) sandwiched between both side blocks (4, 5), and the rotation of the rotor (6) compresses a fluid to be compressed such as a refrigerant. Compression section (P), a suction section (I) for introducing the compressed fluid into the compression section (P), and a discharge section (O) from which the compressed fluid compressed by the compression section (P) is discharged. ) In the casing (1),
A rotary compressor in which the inside of the casing (1) is partitioned by the side blocks (4, 5) such that the suction section (I) is located on one side of the compression section (P) and the discharge section (O) is located on the other side. In the high-pressure chamber, the high-pressure compressed fluid in the discharge section (O) is introduced into the suction section (I) corresponding to the zone (S) for compressing the compressed fluid in the compression section (P). (20) is provided Rutotomoni before
The high-pressure compressed fluid in the discharge section (O) is introduced into the high-pressure chamber (20).
Forming a guiding pressure passage (21) in the casing (1);
Introduced into the high-pressure chamber (20) through the pressure-guiding passage (21).
The compressed high-pressure fluid that has been compressed forms the compression section (P) and the suction section (I).
Press the side block (4) to be cut to the compression part (P) side
A rotary compressor characterized by having a configuration as described above .