JPH08270580A - Hermetically sealed rotary compressor - Google Patents

Abstract

PURPOSE: To perform supply of suction gas efficiently and besides, perform the mixing of oil into suction gas inexpensively without lowering compression capacity. CONSTITUTION: This compressor is equipped with a rotary compression element 4 being driven with the crankshaft 3 of an electromotive element 2, within the sealed container 1, and this rotary compression element is composed of cylinders 5 and 5 partitioned with a partition plate 10 into plural stages and piston rollers 6 and 6 provided capable of alternately eccentric rotation with a crankshaft within these several cylinders. The suction passages 8A and 8B of suction gas G partitioned with the partition plate are made to front on the compression chambers 7 and 7 of each cylinder, and these suction ports are connected to each other by the suction port 11 provided at the partition plate, and a suction pipe 9 is made to front on this suction passage 8 from outside the sealed container, and suction gas sucked through this suction pipe is supplied alternately to the compression chamber of each cylinder. The suction port of the partition plate is made to front on the interior from inside the sidewalls 5a and 5b of each cylinder, whereby a suction gas passage 21 leading to the compression chamber side of each cylinder is made to be used at the time of suction process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder type hermetic rotary compressor mounted in, for example, an air conditioner or a refrigerator, and more particularly to supplying intake gas to a compression chamber of each cylinder of a rotary compression element. By devising the structure and the structure of mixing oil into the intake gas, it is possible to efficiently supply the intake gas, and at the same time, to mix the oil into the intake gas at a low cost without reducing the compression capacity. It was done like this.

[0002]

2. Description of the Related Art Conventionally, in a hermetic rotary compressor of this type, as shown in FIGS. 5 and 6, as a rotary compression element 4 driven by a crankshaft 3 of an electric element 2 in a hermetic container 1. , The piston rollers 6 and 6 provided in the respective cylinders 5 and 5 composed of two cylinders are connected to the crankshaft 3 of the electric element 2.
Are alternately eccentrically rotated by the side walls 5a and 5a of the cylinders 5 and 5 and the side walls 6a and 6a of the piston rollers 6 and 6, respectively.
And compression chambers 7, 7 formed by the upper and lower cylinder surfaces 10a, 10b of the partition plate 10 for partitioning the cylinders 5, 5 from each other.
To the suction passages 8A and 8B for the suction gas G,
These suction passages 8A, 8B are communicated with each other at a suction port portion 11 provided on the partition plate 10, and a single type suction pipe 9 is piped so as to face the suction passage 8 from the outside of the closed container 1, or As shown in FIGS. 7 and 8, one having a configuration in which the suction gas G sucked from the twin suction pipes 9 and 9 is alternately supplied to the compression chambers 7 and 7 of the cylinders 5 and 5, respectively. is there.

[0003]

However, in the above-described conventional hermetic rotary compressor, the inner wall surface 11a of the suction port portion 11 on the side wall surface 5a, 5a side of each cylinder 5, 5 of the partition plate 10 is Side wall surfaces 5a, 5a of each cylinder 5, 5
Located outside from the compression chambers 7 and 7 of the cylinders 5 and 5, respectively.
Since the suction passages 8A and 8B are formed independently of each other, as shown in FIGS. 5 and 6, the suction pipe 9 is arranged in the suction passage 8A along the radial direction to the upper cylinder 5. In the single-type piping structure, the suction passage 8 in the direction of the rotation axis that communicates from one upper cylinder 5 to the other lower cylinder 5 is located outside the side wall surfaces 5a, 5a of the cylinders 5, 5 and has a large construction area. Absent.

Moreover, the suction passage 8B to the lower cylinder 5
Is longer than the suction passage 8A to the upper cylinder 5 in order to form the suction passage 8 that branches off from the suction passage 8A in the radial direction to the upper cylinder 5, so the passage resistance increases, As a result, the suction efficiency into the lower cylinder 5 is reduced.

Even in the twin type suction pipes 9 and 9 shown in FIGS. 7 and 8, since the suction passages 8A and 8B are independent of each other, the suction gas flow rate changes alternately. However, since the intake passage to the other cylinder having the smaller gas flow becomes ineffective against the cylinder having the larger gas flow, improvement of the intake efficiency due to the reduction of the passage resistance cannot be expected.

Further, in order to maintain the sealing property of the sliding portion of the compression mechanism constituting each cylinder 5, 5, and to reduce the sliding noise of the compression mechanism and the hitting noise of the discharge valve and the valve seat, When supplying an appropriate amount of oil to the compression chambers 7, 7, there are a method of mixing the oil in the suction gas G and a method of supplying it through a gap of a sliding portion of the compression mechanism. In the case where oil is mixed into the suction gas by providing a passage such as a capillary tube from the oil storage portion at the inner bottom portion, a component for forming the passage is required, resulting in an increase in cost, and the compression chamber 7, The gap between the sliding surfaces forming 7 is the same as the gap between the opposing suction chambers, and it is not only difficult to increase the gap only on the suction chamber side for refueling, but when the gap is increased, the The sealing performance of the Decrease.

An object of the present invention is to provide a hermetically-sealed rotary compressor capable of efficiently supplying suction gas and, at the same time, mixing oil into suction gas at a low cost without lowering the compression capacity. To provide.

[0008]

In order to solve the above-mentioned problems, the present invention comprises an electric element in a closed container and a rotary compression element driven by the crankshaft of the electric element. The compression element is composed of a cylinder divided into a plurality of stages via partition plates, and a piston roller provided in each of the cylinders so as to be eccentrically rotatable by the crankshaft, and is provided in the compression chamber of each cylinder. The intake passages for the inhaled gas, which are partitioned by the partition plate, are made to face each other, and the intake passages are made to communicate with each other through the intake port portion provided in the partition plate, and the intake pipe is connected to the intake passage from the outside of the closed container. In a hermetically-sealed rotary compressor that is made to face and suction gas sucked through the suction pipe is alternately supplied to the compression chambers of the cylinders, the suction port portion of the partition plate from the side wall surface of the cylinders. on the inside Mase, is obtained by a configuration in which the by forming a suction gas passage communicating with the compression chamber side of the cylinder during the suction stroke.

Further, according to the present invention, in the above structure,
An oil sump formed around the center axis of rotation between the cylinders and at least one suction port of the partition plate on at least one of the cylinder faces on the suction port side facing inward from the side wall surface of each cylinder of the partition plate. It is characterized in that a groove communicating with and is provided.

[0010]

That is, according to the present invention, by adopting the above-mentioned structure, the compression chambers of the cylinders partitioned by the partition plates are made to face the suction gas suction passages, and the suction passages communicate with each other. The intake port portion provided on the inside of the cylinder faces the inside from the side wall surface of each cylinder to form an intake gas passage communicating with the compression chamber side of each cylinder during the intake process. In the piping structure,
Intake gas from the intake gas passage reduces passage resistance, and the intake gas can be efficiently supplied at low cost.

In addition, even in the piping structure of a plurality of types of suction pipes, the gas flowing from the suction passage to the other cylinder having the smaller gas flow may flow into the other cylinder having the smaller suction gas flow. This can be done effectively and the inhalation efficiency can be improved.

Further, an oil sump formed around the center axis of rotation between the cylinders and the suction of the partition plate on at least one of the cylinder surfaces on the suction port side facing inward from the side wall surface of each cylinder of the partition plate. Since the groove communicating with the mouth is provided, the oil in the oil sump is directly supplied to the compression chamber of each cylinder through the suction passage and the suction gas passage, which prevents the oil from mixing with the suction gas. In addition to being inexpensive, it is possible to maintain the gap of the sliding portion forming the compression chamber at the optimum dimension for sliding, which enhances the sealing property of the compression chamber and prevents the compression capacity from decreasing.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings shown in FIGS. In the illustrated embodiment of the present invention, the same parts as those of the conventional structure shown in FIGS. 5 to 8 will be described with the same reference numerals.

1 to 3 show a first embodiment applied to a piping structure of a single type suction pipe in a hermetic rotary compressor according to the present invention.

This hermetic rotary compressor has an overall structure basically the same as that of the conventional structure shown in FIG.
As the rotary compression element 4 driven by the crank shaft 3 of the electric element 2 in the closed container 1, for example, piston rollers 6, 6 provided in each cylinder 5, 5 consisting of two cylinders are used as cranks of the electric element 2. The shafts 3 are alternately eccentrically rotated, and the side walls 5a and 5a of the cylinders 5 and 5, the side walls 6a and 6a of the piston rollers 6 and 6 and the cylinders 5 and 5 are rotated.
Upper and lower cylinder surfaces 10a, 10 of the partition plate 10 for partitioning the space
Intake passages 8A, 8B for the inhaled gas G are made to face the compression chambers 7, 7 formed by b, respectively.
B are communicated with each other at the suction port portion 11 provided in the partition plate 10, and the suction pipe 9 is provided from the outside of the closed container 1.
Of the intake gas G sucked from the suction pipe 9 is alternately supplied to the compression chambers 7, 7 of the cylinders 5, 5 by facing the suction passage 8A along the radial direction of the suction passage 8. It is a thing.

Then, as shown in FIGS. 1 to 3, the suction port portion 11 of the partition plate 10 has its inner wall surface 11a exposed from the side wall surfaces 5a, 5a of the respective cylinders 5, 5 to the inside. The intake gas passage 21 communicating with the compression chambers 7, 7 side of each of the cylinders 5, 5 at the time of the suction step is formed, and as shown by a solid arrow in FIG. The intake gas G is directly supplied from the one intake passage 8A to the upper compression chamber 7 during the suction process by 5, while bypassing the other intake passage 8B side facing the compression chamber 7 of the lower cylinder 5. The suction gas G is further supplied to the upper compression chamber 7.

Further, as shown in FIG. 2, the partition plate 10
Of at least one of the cylinder surfaces 10a and 10b, for example, the cylinder surface 10 corresponding to the upper cylinder 5 side.
A groove 12 communicating with the oil reservoir 22 formed around the rotation center axis between the cylinders 5 and 5 and the suction port portion 11 of the partition plate 10 is provided in a along the radial direction. By forming the groove 12, the oil from the oil sump 22 is transferred to the upper cylinder 5 as shown by the solid arrow in FIG.
Is directly supplied to the suction passage 8B side facing the compression chamber 7 and the lower cylinder 5.

FIG. 4 shows a second embodiment of the hermetic rotary compressor according to the present invention, which has a construction applied to the conventional twin type suction pipes 9, 9 shown in FIG. It is a thing.

[0019]

As is apparent from the above description, the present invention includes an electric element in a closed container and a rotary compression element driven by the crankshaft of the electric element. It is composed of cylinders divided into multiple stages via partition plates, and piston rollers that are alternately eccentrically rotatable by crankshafts inside each of these cylinders.The compression chambers of each cylinder are partitioned by partition plates. The suction passages for the suctioned gas are made to face each other, and the suction passages are made to communicate with each other through the suction port portion provided on the partition plate, and the suction pipe is made to face the suction passage from the outside of the closed container. In a hermetic rotary compressor in which suction gas to be sucked is alternately supplied to the compression chambers of each cylinder, the suction port portion of the partition plate faces the inside from the side wall surface of each cylinder, Compression chamber side Since the intake gas passage that communicates with each other is formed, in the piping structure of the single type intake pipe, the passage resistance can be reduced by inhaling the gas from the intake gas passage, and the intake gas can be efficiently supplied. It can be done cheaply.

Further, even in the piping structure of a plurality of types of suction pipes, the inflow of gas from the suction passage to the other cylinder having the smaller gas flow is made to flow into the other cylinder having the smaller gas flow. It can be effectively performed, and inhalation efficiency can be improved.

Further, according to a second aspect of the present invention, an oil sump formed around the center axis of rotation between the cylinders on at least one of the cylinder surfaces of the partition plate facing the inside from the side wall surface of each cylinder Since a groove that communicates with the suction port of the partition plate is provided, the oil in the oil sump can be directly supplied to the compression chamber of each cylinder through the suction passage and the suction gas passage. It is possible to mix the oil with the gas at a low cost, and it is also possible to maintain the gap of the sliding portion that constitutes the compression chamber at the best dimension for sliding, thereby improving the sealing property of the compression chamber,
It is possible to prevent the compression capacity from decreasing.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part of a rotary compression element showing a first embodiment of a hermetic rotary compressor according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a portion A of FIG.

FIG. 3 is an enlarged cross-sectional view of the same main part.

FIG. 4 is an enlarged cross-sectional view of a main part of a rotary compression element showing a second embodiment of the hermetic rotary compressor according to the present invention.

FIG. 5 is a cross-sectional view of the entire configuration of a conventional hermetic rotary compressor.

FIG. 6 is an enlarged sectional view of an essential part of a conventional rotary compression element.

FIG. 7 is a cross-sectional view of the overall configuration of another example of a conventional hermetic rotary compressor.

FIG. 8 is an enlarged sectional view of an essential part of another example of the conventional rotary compression element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container, 2 ... Electric element, 3 ... Crank shaft, 4 ... Rotary compression element, 5,5 ... Cylinder, 5a, 5a ... Side wall surface, 6,6. ..Piston rollers, 7, 7 ... Compression chambers, 8, 8A, 8B ... Suction passages, 9 ... Suction pipes, 10 ... Partition plates, 10a, 10b ... Cylinder surfaces, 11. ..Suction port, 11a ... Side wall surface, 12 ... Groove, 21 ... Suction gas passage, 22 ... Oil sump.

Claims (2)

[Claims] 1. A sealed container comprising an electric element and a rotary compression element driven by a crankshaft of the electric element, the rotary compression element being a cylinder divided into a plurality of stages via partition plates. , A piston roller provided in each of the cylinders so as to be eccentrically rotatable by the crankshaft alternately, and a suction passage of the intake gas partitioned by the partition plate faces the compression chamber of each cylinder. , These communication passages are communicated with each other through the suction port provided on the partition plate,
The suction pipe is exposed to the suction passage from the outside of the closed container,
In a hermetic rotary compressor in which the suction gas sucked through the suction pipe is alternately supplied to the compression chambers of the cylinders, the suction port portion of the partition plate is exposed from the side wall surface of the cylinders to the inside. No, the hermetic rotary compressor is characterized in that an intake gas passage communicating with the compression chamber side of each of the cylinders during the suction step is formed. 2. A closed container comprising an electric element and a rotary compression element driven by a crank shaft of the electric element, the rotary compression element being a cylinder divided into a plurality of stages via partition plates. , A piston roller provided in each of the cylinders so as to be eccentrically rotatable by the crankshaft alternately, and a suction passage of the intake gas partitioned by the partition plate faces the compression chamber of each cylinder. , These communication passages are communicated with each other through the suction port provided on the partition plate,
The suction pipe is exposed to the suction passage from the outside of the closed container,
In a hermetic rotary compressor in which the suction gas sucked through the suction pipe is alternately supplied to the compression chambers of the cylinders, the suction port portion of the partition plate is exposed from the side wall surface of the cylinders to the inside. No, while forming an intake gas passage that communicates with the compression chamber side of each cylinder during the suction step, and at least one cylinder surface of the partition plate facing the inside from the side wall surface of each cylinder A hermetic rotary compressor characterized in that a groove communicating with an oil reservoir formed around a rotation center axis between the cylinders and a suction port of the partition plate is provided.