JPH07103166A - Multicylinder type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent and sealing leakage in enlarging a tight range as well as to secure an efficient compression. CONSTITUTION:This compressor is provided with two cylinders 13 and 15 with each of rollers 17 and 18 in a closed case 1, an intermediate partition plate 11 partitioning off both these cylinders 13 and 15, while having a shaft through hole 11a coming into contact with these rollers 17 and 18 with each other, a main shaft 19 piercing through both these cylinders 13, 15 and the intermediate partition plate 11 and given a rotary motion by a driving means 5, and two eccentric shaft part 19a and 19b being installed in the main shaft 19 and imparting an eccentric rotation to each of these rollers 17 and 18 of both the cylinders 13 and 15. In this constitution, it is made up of installing a ringlike sealing member 31 enlarging a contact area with each side of these rollers 17 and 18 in the shaft through hole 11a of the intermediate partition plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder rotary compressor having a plurality of cylinders partitioned by an intermediate partition plate.

[0002]

2. Description of the Related Art Generally, in a multi-cylinder type rotary compressor, as shown in Japanese Patent Laid-Open No. 63-205486, two rotary compressors are provided in a hermetically sealed case and provided with rollers different in compression phase by about 180 degrees. A cylinder and an intermediate partition plate that partitions both cylinders and has a shaft through hole that comes into contact with the side surface of each roller, a spindle that penetrates both cylinders and intermediate partition plates, and is given a rotational motion by drive means. And an eccentric shaft portion that provides eccentric rotation to the rollers of both cylinders. The side surface of each roller contacts the intermediate partition plate, and the intermediate partition plate constitutes the side wall of the compression chamber.

[0003]

As described above, in the multi-cylinder type rotary compressor, the main shaft having the eccentric shaft portion penetrates both cylinders and the intermediate partition plate.

For this reason, the shaft through hole provided in the intermediate partition plate is set to be larger than the shaft diameter of the eccentric shaft portion of the main shaft so that the eccentric shaft portion can pass through the shaft through hole without trouble during assembly. Has become.

The side surface of the roller during the compression operation secures a seal by contacting with the wall surface of the intermediate partition plate, but when the roller is deviated to the main spindle side of the center, it is caught in the shaft through hole, and therefore the seal is formed. The tight width of the surface is significantly reduced.

In particular, in recent years, an environment-friendly alternative refrigerant has been used from CFCs (refrigerants) which adversely affect the environment, but the alternative refrigerant tends to have a large pressure difference between the discharge gas and the suction gas. . FIG. 25 shows the relationship between the differential pressure and the tight width, but if the tight width is small, there is a problem in that seal leakage easily occurs and the performance deteriorates.

Therefore, an object of the present invention is to provide a multi-cylinder type rotary compressor in which the tight width of the shaft through hole region is enlarged to improve the sealing performance.

[0008]

In order to achieve the above object, the present invention is directed to two cylinders having rollers in a hermetically sealed case and a shaft for partitioning both cylinders and contacting side surfaces of the rollers. An intermediate partition plate having a through hole, a main shaft penetrating both cylinders and the intermediate partition plate and given a rotary motion by a drive means, and an eccentric shaft portion provided on the main shaft for eccentrically rotating the rollers of both cylinders, A ring-shaped seal member is provided in the shaft through hole of the intermediate partition plate so as to enlarge the contact area with the side surface of each roller.

In a preferred embodiment, the intermediate partition plate is divided into two parts, and the seal member is sandwiched by the two intermediate partition plates and provided in the shaft through hole. Alternatively, the seal member provided in the shaft through hole of the intermediate partition plate may be provided with a flange portion that comes into contact with the side surface of the roller, or the seal member in the shaft through hole of the intermediate partition plate may be provided only in the discharge side region. It is to be placed.

[0010]

According to such a multi-cylinder type rotary compressor, the seal member can be securely attached to the shaft through hole, and a compression chamber for compressing the refrigerant is formed on the outer peripheral surface of the roller. .

On the other hand, during operation, when the roller is eccentrically rotated toward the main shaft side of the center, even if the side surface of the roller is caught in the region of the shaft through hole, the tight width is surely ensured by the seal member, so that the seal is ensured. There is no risk of leaks.

[0012]

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

In FIG. 1, 1 is a multi-cylinder rotary compressor 3
The closed case of is shown. The closed case 1 has a suction pipe 6 and a discharge pipe 10, and an electric motor section 5 is provided on the upper side of the closed case 1 and a compressor section 9 is provided on the lower side thereof.

The electric motor section 5 comprises a stator 7 and a rotor 8. The stator 7 is fixedly supported on the inner wall surface of the closed case 1, and the rotor 8 is fixed to a main shaft 19 described later.

The compressor section 9 is composed of a first cylinder 13 and a second cylinder 15 which are partitioned by a partition plate 11 in the middle, and the first and second cylinders 13 and 15 are eccentrically rotatable. Rollers 17, 18 are provided. A blade 21 that is in constant contact with each of the rollers 17 and 18 acts on the rollers 17 and 18 by a biasing means such as a back pressure or a spring, and the cylinder 1
The inside of 3, 15 is configured so that a compression chamber partitioned by the blade 21 into a suction side and a discharge side is created.

The first and second cylinders 13 and 15 communicate with each other via a suction passage 23 provided in the intermediate partition plate 11,
The refrigerant taken in from the suction pipe 6 is transferred to each cylinder 13, 1
After being compressed in the discharge pipe 5, it is discharged from the discharge pipe 10 through the discharge ports 25 and 26.

The first and the first partitions partitioned by the intermediate partition plate 11
The main shaft 19 penetrates through the second cylinders 13 and 15 and the intermediate partition plate 11.

The main shaft 19 is composed of the first and second cylinders 13,
It is rotatably supported by upper and lower main bearing members 27 and auxiliary bearing members 29, which are bolted so as to sandwich 15 from above and below.

On the main shaft 19, the first and second cylinders 1
Eccentric shaft portions 19a and 19b, which are out of phase with each other by 180 degrees, are provided at the portions corresponding to 3, 15 and the rollers 1 of the cylinders 13 and 15 are attached to these eccentric shaft portions 19a and 19b.
7, 19 are inserted. This allows each roller 17,1
The eccentric shaft 9 is eccentrically rotated by 180 degrees out of phase by the rotation of the eccentric shafts 19a and 19b.

On the other hand, the intermediate partition plate 11 has a shaft through hole 11a through which the eccentric shaft portions 19a, 19 and b of the main shaft 19 pass, and the shaft through hole 11a has a ring shape having a predetermined thickness. The seal member 31 is provided.

As shown in FIG. 5, the relationship between the seal member 31 and the side surfaces of the rollers 17 and 18 is such that the side surface of the roller 18 is within the area b of the seal member 31 when the roller 18 is eccentrically rotated on the center side. It is set to fit. As a result, a reliable tight width D is secured, while the rollers 17,
The seal member 31 is fixedly supported by 18 so that the seal member 31 can be pressed from the left and right.

The seal member 31 is divided into two parts, the main shaft 1
The shaft 9 can be retrofitted to the shaft through hole 11a through which the shaft 9 penetrates without any trouble.

FIG. 4 shows a mounting procedure for mounting the seal member 31. That is, after temporarily assembling the first cylinder 13 and the main bearing member 27 with the bolts 33 (FIG. A), the roller 17 is assembled into the first cylinder 13 and the roller 17 is fitted and inserted into the eccentric shaft portion 19a. The main shaft 19 is penetrated from the 1-cylinder 13 side (Fig. B). Next, on the first cylinder 13 side through which the main shaft 19 penetrates, the intermediate partition plate 11 into which the main shaft 19 is fitted is temporarily supported by the shaft through hole 11a,
The seal member 31 divided into two is provided with the shaft through hole 11a.
It can be installed without trouble by installing it inside (Fig. D). Next, after inserting the roller 18 into the eccentric shaft portion 19b of the main shaft 19, the second cylinder 15 and the auxiliary bearing member 29 are fitted and temporarily assembled (Fig. E), and then the mounting bolt is penetrated. (Fig. F).

In this case, as shown in FIG. 7, each of the two divided seal members 7 is provided with a flange portion 31a in the same direction which comes into contact with the side surface of the roller 18 on the second cylinder 15 side. Good. Note that the flange portion 31a can be provided so as to face the first and second cylinders 13 and 15, respectively, as shown in FIG.

Further, as shown in FIG. 11, the flange portion 31
of the intermediate partition plate 11 by extending the flange portion 31a so that a is directed toward the first cylinder 13 side and the second cylinder 15 or, as shown in FIG. The shape may be the entire area. In the case of this embodiment, the boundary between the intermediate partition plate 11 and the seal member 31 is eliminated, and good sealing performance can be secured.

As a modification, as shown in FIG. 14, the seal member 31 is provided on the suction side (PS side) of the intermediate partition plate 11.
Alternatively, the tight width on the discharge side (Pd side) with a large amount of gas leakage may be secured to be large. Alternatively, as shown in FIG. 15, the intermediate partition plate 11 may be eccentric to the suction side (PS side) by α, or as shown in FIG. 16, the discharge side region (Pd) of the shaft through hole 11a of the intermediate partition plate 11 may be formed.
By providing a half-moon shaped seal member 31 on the side), a tight width on the discharge side (PS side) where the gas pressure becomes high may be secured large. In particular, in the embodiment of FIG. 16 in which the seal member 31 has a half-moon shape, there is an advantage that it can be assembled into the shaft through hole 11a without dividing into two.

As shown in FIG. 18, a flange portion 31b is provided on the outer periphery of the center of the seal member 31 which is divided into two parts, while the intermediate partition plate 11 is divided into two parts so as to be orthogonal to the axis.
Shaft through hole 11a
On the other hand, the flange portion 31b of the seal member 31 may be sandwiched between the intermediate partition plates 11 so as to be fixedly supported.

In the case of this embodiment, the flange portion 31b
As a result of being sandwiched by the intermediate partition plate 11, there is an advantage that the seal member 31 is securely fixed and supported.

According to the multi-cylinder type rotary compressor constructed as described above, each roller 1 is constituted by the eccentric shaft portions 19a and 19b.
By giving eccentric rotation to 7 and 18, the refrigerant taken in from the suction pipe 6 is compressed and discharged from the discharge ports 25 and 26.

In this operation, when the rollers 17 and 18 are deviated toward the central spindle 19 side, the tight width D is surely secured by the seal member 31 on the side surfaces of the rollers 17 and 18, and as a result, seal leakage does not occur. In other words, an efficient compressed state can be obtained.

[0031]

As described above, according to the multi-cylinder rotary compressor of the present invention, the tight width can be expanded by the seal member provided in the shaft through hole, so that the seal leakage is prevented and the efficiency is improved. A good compressed state can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a multi-cylinder rotary compressor embodying the present invention.

FIG. 2 is an explanatory diagram in which a seal member is provided on an intermediate partition plate.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an assembly explanatory diagram (a), (b), (c), (d),
(E), (f).

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is an explanatory view similar to FIG. 2, in which a flange portion is provided on the seal member.

7 is a cross-sectional view taken along the line CC of FIG.

8 is a sectional view similar to FIG. 7, in which the orientation of the flange portion is different by 180 degrees.

9 is a sectional view similar to FIG. 1 in which the seal member of FIG. 7 is provided on the intermediate partition plate.

FIG. 10 is an explanatory view similar to FIG. 2 in which the flange portion is extended to the outer peripheral edge of the intermediate partition plate.

FIG. 11 is a central longitudinal sectional view of FIG.

FIG. 12 is a sectional view similar to FIG. 11, in which the flange portions are oriented in the same direction.

13 is a sectional view similar to FIG. 1 in which the seal member of FIG. 11 is provided on the intermediate partition plate.

FIG. 14 is an explanatory view similar to FIG. 2 in which the seal member is eccentric to the suction side.

15 is an explanatory view similar to FIG. 2 in which the intermediate partition plate is eccentric to the suction side.

FIG. 16 is an explanatory view similar to FIG. 2, in which the seal member has a half-moon shape and is provided in the discharge side region of the shaft through hole.

FIG. 17 is a view in which a flange portion is provided on the outer periphery of the seal member, and the flange portion is sandwiched by an intermediate partition plate having two cracks.
Explanatory drawing similar to FIG.

FIG. 18 is a central longitudinal sectional view of FIG.

19 is a sectional view similar to FIG. 1 in which the sealing member of FIG. 18 is implemented.

FIG. 20 is an explanatory diagram showing the relationship between the amount of leakage due to the differential pressure and the tight width.

[Explanation of symbols]

 5 Electric Motor Section (Driving Means) 11 Intermediate Partition Plates 13 and 15 Cylinders 17 and 18 Rollers 19 Spindles 19a and 19b Eccentric Shafts 31 Sealing Members

Front page continuation (72) Inventor Makoto Hayano 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside Toshiba Living Space System Technology Research Laboratories (72) Inventor, Hitoshi Hattori 8-Shin-sugita-cho, Isogo-ku, Yokohama, Kanagawa Company Toshiba Living Space Systems Engineering Laboratory (72) Inventor Katsuya Minami 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Ltd. Inside Toshiba Living Space Systems Engineering Laboratory (72) Inventor Isshin Myojin 3-chome, Shinbashi, Minato-ku, Tokyo No. 3-9 Toshiba Abu E Co., Ltd.

Claims (4)

[Claims] 1. A cylinder provided with two rollers in a hermetically sealed case, an intermediate partition plate having a shaft through hole that partitions both cylinders and is in contact with a side surface of each roller, and both cylinders and an intermediate partition plate. A main shaft that penetrates and is given a rotational motion by a drive means; and an eccentric shaft portion that is provided on the main shaft and that provides eccentric rotation to the rollers of both cylinders.
A multi-cylinder rotary compressor characterized in that a ring-shaped seal member for enlarging a contact area with a side surface of each roller is provided in a shaft through hole of the intermediate partition plate. 2. The multi-cylinder type rotary compression according to claim 1, wherein the intermediate partition plate is divided into two parts, and the seal member is sandwiched by the two divided intermediate partition plates and provided in the shaft through hole. Machine. 3. The multi-cylinder rotary compressor according to claim 1, wherein the seal member provided in the shaft through hole of the intermediate partition plate is provided with a flange portion that comes into contact with the side surface of the roller. 4. The multi-cylinder rotary compressor according to claim 1, wherein the seal member provided in the shaft through hole of the intermediate partition plate is provided only in the discharge side region.