JPH06159276A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce loss caused by thermal explanation during suction of Coolant so as to enhance the function by forming a plurality of compression chambers in a single cylinder so as to reduce the number of necessary and to form a large diameter suction port spanning over the chambers. CONSTITUTION:A cylinder 25 is fixed and supported between a main bearing 17 and an auxiliary bearing 19 fitted on a main shaft 11 laid the rotating axis center of a drive part 7 for urging a rotary power. The inside of the cylinder 25 is divided into a plurality of chambers by means of partition walls 23, axially of the main shaft 11. A plurality of rollers 27 are located in the chambers, which are eccentrically rotated, with respect to the center axis of the main shaft 11. Meanwhile, a blade is extended and retracted in association with the eccentric rotation of the rollers 27 so that compression chambers 31 which are independent from each other are defined. By the way, coolant is sucked into the compression chambers 31 from a suction port 33, and is discharged from a discharge port 41. With this arrangement, two compression chamber 31 can be formed in a single cylinder 25, and the suction port is enlarged so as to reduce loss caused by thermal expansion, thereby it is possible to enhance the function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor.

[0002]

2. Description of the Related Art An outline of a general rotary compressor is as follows: a drive unit that applies rotational power, a main shaft that is provided at the center of rotation of the drive unit, a main bearing and a sub bearing that are mounted on the main shaft. A cylinder fixedly supported between the rollers, a roller that rotates in the cylinder eccentrically with respect to the axis of the main shaft, and expands and contracts by advancing and retracting in response to the eccentric rotation motion of the roller. And a suction port for introducing the refrigerant into the compression chamber, and a discharge port for discharging the compressed refrigerant.

[0003]

According to the rotary compressor described above, the refrigerant taken in from the suction port is compressed in the compression chamber and discharged from the discharge port. In this case, two cylinders are combined. There is a 2-cylinder type that doubles the capacity.

In this two-cylinder type rotary compressor, a means is employed in which independent cylinders are completely brought into close contact with each other by screws and fixed together. As a result, the number of parts is increased and the assembling work becomes very troublesome, which is not desirable in terms of man-hours for managing parts and productivity.

Further, if the port diameter of the suction port is increased,
Since the cylinder wall thickness around the port becomes thin, there is a problem that the port diameter cannot be made too large. As a result, when the refrigerant is sucked, there is a problem that performance is deteriorated due to excessive expansion and large loss.

Therefore, it is an object of the present invention to provide a rotary compressor having a high performance by reducing the number of parts.

[0007]

In order to achieve the above-mentioned object, the present invention is directed to a drive unit for applying rotational power, a main shaft provided at the center of rotation of the drive unit, and a main shaft mounted on the main shaft. A cylinder fixedly supported between the main bearing and the sub bearing, a partitioning member for partitioning the inside of the cylinder into a plurality of chambers in the axial direction of the main shaft, and a main shaft that receives rotation of the main shaft inside each cylinder A plurality of rollers that eccentrically rotate with respect to the shaft center, a blade that advances and retreats in response to the eccentric rotational movement of the rollers to form an independent compression chamber, a suction port that introduces refrigerant into each compression chamber, and a compression The suction port for discharging the refrigerant is provided over the region of the plurality of compression chambers and is a common suction port for each compression chamber.

In a preferred embodiment, a partition plate having an outer periphery inscribed in the cylinder is inserted into the cylinder and held in a state of being sandwiched between the rollers, or a peripheral groove is formed on the inner periphery of the cylinder. The partition plate provided and fixed in the cylinder is fixed in the circumferential groove by shrink fitting.

[0009]

According to such a rotary compressor, the number of main parts can be reduced because only one cylinder is required to form a plurality of compression chambers.

On the other hand, the refrigerant taken in from the suction port is compressed in each compression chamber and discharged from the discharge port to the outside. During this operation, the suction port has a large port diameter that extends over each compression chamber, so that there is no loss due to overexpansion when the refrigerant is sucked. Further, the assembling becomes easy, and moreover, the partition member can be securely fixed.

[0011]

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, reference numeral 1 denotes a closed case having a suction pipe 3 and a discharge pipe 5. A drive unit 7 serving as a drive unit is provided in an upper portion of the closed case 1, and a compressor unit 9 is provided in a lower portion thereof. ing.

The drive unit 7 is a rotor 1 fixed to a main shaft 11.
3 and a stator 15 fixed to the hermetically sealed case 1 side, and when a current flows through the stator 15, rotational power is applied to the main shaft 11 via the rotor 13.

The main shaft 11 is rotatably supported by a main bearing 17 and a sub bearing 19, and the main shaft 11 is provided with a pair of cam portions 21 and 21 which are eccentric from the shaft center W by a predetermined amount. 21 and 21 are arranged 180 degrees apart,
An eccentric rotation with a phase difference of 180 ° is performed with respect to the rotation of the main shaft 11.

On the other hand, the compressor section 9 includes a cylinder 25 partitioned into two chambers by a partition member 23, and a cylinder 25.
And a pair of cam portions 21 and 21 in each room
Due to the eccentric rotation of the rollers 1, 21, a pair of rollers 27 with which the peripheral wall of the cam 21 is slidably contacted is incorporated. The peripheral wall of the pair of rollers 27 rotates in the cylinder 25 while slidably contacting the inner wall of the cylinder 25, and the pair of rollers The pair of blades 29 advance and retreat in the blade groove 35 formed in the circumferential groove of the cylinder 25 by the rotational movement of 27, and the cam portion 21, the roller 27, and the blade 29 form the compression chambers 31, 31. .

The cylinder 25 is partitioned into two chambers by a partition member 23 and is fixedly supported by a fixing bolt 32 in a state of being sandwiched between the side housings 17a, 19a of the main bearing 17 and the sub bearing 19 described above.
Further, the cylinder 25 is bolted to a support bracket 34 extending from the closed case 1 via a mounting bolt 36.

The cylinder 25 is provided with a suction port 33 and a blade groove 35, and the suction port 33 is provided.
Has a large port diameter over the region of each compression chamber 31, 31.

The partition member 23 is formed in a ring shape having an opening at the center, and the outer diameter d is set to be substantially the same as the inner diameter of the cylinder 25. In addition, the partition member 23 has a shape having a protrusion 37 that is inserted into the blade groove 35 of the cylinder 25, and is positioned at a substantially central portion of the cylinder 25 by the pair of rotors 27, 27.

In this case, with respect to the means for positioning the partition member 23 substantially at the central portion of the cylinder 25, for example,
As shown in FIG. 3, a partitioning member 23 formed in a ring shape may be inserted into a heated cylinder 25, and then the cylinder 25 may be cooled so as to be fixedly supported by shrink fitting. According to this means, the partition member 2
3 can be fixed in a stable manner, which is extremely advantageous for gas leakage and the like.

Further, as shown in FIG. 4, the ring-shaped partitioning member 23 is inserted into the cylinder 25, and it is used as a positioning means for fixedly supporting it by the retaining rings 39, 39 press-fitted from above and below the cylinder 25. Is also possible. According to this means, the assembling becomes easy and it is very preferable in terms of workability.

On the other hand, the rotor 27 is formed in a thick ring shape having a fitting hole, and the fitting hole is fitted and inserted into the cam portions 21 and 21. Therefore, the rotor 27 is
By the rotation of 1, the outer peripheral surface of the rotor 27 is partly in line contact with the inner peripheral surface of the cylinder 25 so that eccentric rotation is given.

The blade 29 is installed in the blade groove 35 of the cylinder 25 so as to be able to move forward and backward, and is biased by a biasing means 41 such as a spring so as to always move forward, and its tip edge is in contact with the rotor 27. . Thus, the eccentric rotation of the rotor 27 allows the blades 29 to move forward and backward, thereby providing compression chambers 31 and 31 that expand and contract.

The compression chamber 31 comes into communication with the discharge ports 41 provided in the side housings 17a and 19a of the main bearing 17 and the sub bearing 19 at the time of maximum compression.

In FIG. 1, 43 is the discharge port 41.
An on-off valve that is provided on the and that opens and closes by pressure is shown.

According to the rotary compressor having such a structure, the cylinder 25 is a twin type having two compression chambers 31 and 31, but only one cylinder 25 is required as a main functional component. .

On the other hand, the refrigerant taken in from the suction port 33 is compressed in the compression chambers 31 and 31 and discharged from the discharge ports 41 and 4.
1 will be discharged respectively. At the time of this operation, since the suction port 33 has a large port diameter, the loss due to overexpansion at the time of suction is eliminated and the performance is improved.

[0027]

As described above, according to the present invention, the following effects can be obtained.

(1) Since the number of main parts can be reduced, it is very preferable in terms of man-hours for parts management, cost and productivity.

(2) Since the suction port can have a large diameter, the loss due to overexpansion is reduced and the performance can be improved.

(3) The partition member can be securely fixed and supported while facilitating the assembling.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary compressor according to the present invention.

FIG. 2 is an exploded perspective view of a cylinder and a partition member.

FIG. 3 is an explanatory view showing an embodiment in which a partition member is positioned by shrink fitting at an intermediate portion of a cylinder.

FIG. 4 is an explanatory view showing an example in which a partition member is positioned by a retaining ring at an intermediate portion of a cylinder.

[Explanation of symbols]

 7 Drive means (driving part) 11 Main shaft 17 Main bearing 19 Sub bearing 23 Partition member 25 Cylinder 27 Roller 29 Blade 31 Compression chamber 33 Suction port 41 Discharge port

Front page continued (72) Inventor Masao Ozu 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside Toshiba Living Space System Technology Research Laboratory (72) Inventor Tsuneo Itami 8-sugi, Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa (72) Inventor, Naoya Ryukaku, Ltd. 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd.

Claims (4)

[Claims] 1. A drive unit for urging rotational power, a main shaft provided at the center of rotation of the drive unit, and a cylinder fixedly supported between a main bearing and a sub bearing mounted on the main shaft. ,
A partition member that partitions the inside of the cylinder into a plurality of chambers in the axial direction of the main shaft, a plurality of rollers that are arranged in each chamber and that rotate eccentrically with respect to the axis of the main shaft in response to the rotation of the main shaft, and eccentric rotation of the rollers. Characterized by including blades that move in and out in response to movement to form independent compression chambers, suction ports that take in refrigerant into each compression chamber, and discharge ports that discharge compressed refrigerant Rotary compressor. 2. The rotary compressor according to claim 1, wherein the suction port for taking in the refrigerant is provided over the region of the plurality of compression chambers and is a common suction port for the respective compression chambers. 3. The rotary compressor according to claim 1, wherein a partition plate having an outer periphery inscribed in the cylinder is inserted into the cylinder and held in a state of being sandwiched between the rollers. 4. The rotary compressor according to claim 1, wherein a peripheral groove is provided on the inner periphery of the cylinder, and the partition plate inserted in the cylinder is fixed in the peripheral groove by shrink fitting.