JPH08105392A - Scroll type compressor - Google Patents

Abstract

PURPOSE: To improve the reliability by cutting a passage to introduce the gas refrigerant sucked into a sealed housing into the space demarcated by a frame and an end plate of a turning scroll in the frame to sufficiently feed the oil to each slidable part in the space. CONSTITUTION: In a scroll type compressor where a scroll type compressor mechanism consisting of a fixed scroll 1, a main bearing scroll 2, a rotation preventing mechanism 6, etc., a frame 5 on which a main bearing 50, etc., is mounted, and an electric motor, etc., are arranged in a sealed housing 4 consisting of a plurality of members, a passage 55 for introducing the gas refrigerant is cut in the frame 5. The gas refrigerant (including the mist-like lubrication oil) flown into the low pressure side 48 in the sealed housing 4 is introduced into a space 50 to be demarcated by the outer side of the frame 5 and the end plate 21 of the turning scroll 2 by this passage 55. The oil can be sufficiently fed to each slidable part such as the bearing in the vicinity of the space 50.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional scroll type compressor. In the drawing, reference numeral 4 denotes a closed housing, which is composed of a deep cup-shaped right end plate 49 and a shallow cup-shaped left end plate 43 fastened thereto with bolts 56. Sub bearing 5 inside the right end plate 49
1. The electric motor M, and the frame 5 at its end,
A scroll type compression mechanism C is provided inside the left end plate 43.
Are arranged, and the electric motor M and the compression mechanism C are interlockingly connected to each other via the rotary shaft 3.

The rotary shaft 3 is mounted on the right end plate 49 via a sub bearing 51 and a main bearing 52.
It is rotatably supported by. The electric motor M is a rotor M
The rotor Ma is fixed to the rotating shaft 3, and the stator Mb is fixed by being pressed into the right end plate 49.

The frame 5 has its inner fitting portion 5a fitted to the end portion of the right end plate 49, and its flange portion 5b.
Is sandwiched between the flange portion of the right end plate 49 and the flange portion of the left end plate 43, and is fastened together with the above flange portions by bolts 56, thereby being fixed in the closed housing 4. A main bearing 52 is attached to the center of the frame 5, and a thrust bearing 53 is fixed to the outer peripheral edge of the frame 5 to support the rotation preventing mechanism 6. There is also a passage 5 in the frame 5.
4 are drilled.

The scroll type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, a rotation preventing mechanism 6 such as an Oldham link for preventing the rotation of the orbiting scroll 2 from rotating. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and the end plate 11 is fastened to the left end plate 43 by a bolt 57. By closely contacting the outer peripheral surface of the end plate 11 and the inner peripheral surface of the left end plate 43, the inside of the closed housing 1 is partitioned, the discharge chamber 46 is formed outside the end plate 11, and the suction chamber 47 is formed inside. Be limited. A discharge port 13 is formed in the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17.

The orbiting scroll 2 has an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21.
The drive bush 32 is installed in the boss 23 provided upright on the outer surface of the
Is rotatably fitted through a swivel bearing 34, and an eccentric drive pin 31 eccentrically provided at an inner end of the rotary shaft 3 is slidably mounted in a slide groove 33 formed in the drive bush 32. It is fitted. A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and engaging them by shifting the angle by 180 degrees.

By driving the electric motor M, the rotary shaft 3, the eccentric drive pin 31, the drive bush 3
2. The orbiting scroll 2 is driven through a orbiting drive mechanism including a boss 23, and the orbiting scroll 2 is revolved on a circular orbit having an orbiting radius while being prevented from rotating by a rotation preventing mechanism 6. Then, the gas enters the low pressure side 48 through the suction pipe 44. This gas is in the passage 58 provided in the outer circumference of the stator Mb and in the gap between the stator Mb and the rotor Ma. After passing through the suction chamber 47 through the passage 54 provided in the frame 5, the air is sucked into the closed space 24, and compressed as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2. While reaching the central portion, the discharge valve 17 is pushed open from the discharge port 13 to be discharged into the discharge chamber 46, and from there, through the discharge pipe 45, flows out to the external system.

FIG. 4 is a sectional view of a rotation preventing mechanism portion in a conventional compressor, FIG. 4A is a cross sectional view of a scroll type compressor in the rotation preventing mechanism portion, and FIG. (a) BB sectional drawing, the same figure (c) is C- of the same figure (a).
It is C sectional drawing. In the figure, 7 is an Oldham link, which is the main part of the rotation preventing mechanism 6, and a horseshoe-shaped ring 71, a horizontal key 72 protruding in the outer peripheral direction on the horizontal center line thereof, and an outer surface on the vertical center line thereof. The vertical key 73 is provided. Then, two key grooves 61 are formed on the horizontal center line of the outer peripheral portion of the frame 5,
The two horizontal keys 72 of the Oldham link 7 are slidably fitted. In addition, the end plate 2 of the orbiting scroll 2
A key groove (not shown) is formed in the peripheral edge of the outer surface of 1, and the above-described two vertical keys 73 of the Oldham link 7 are slidably fitted therein.

As shown in FIG. 3, the fixed scroll 1 is positioned and fixed to the frame 5 via the left end plate 43, so that the orbiting scroll 2 is the Oldham link 7.
It is connected to the fixed scroll 1 via the horizontal key 72 of the book and the vertical keys 73 at two places, meshes with each other by shifting the angle by 180 degrees, and revolves on a circular orbit of the revolution radius while preventing rotation. can do.

[0010]

In the conventional scroll type compressor described above, oil is supplied to the sliding parts in and around the scroll type compression mechanism C by gas flowing into the low pressure side 48 of the hermetic housing 4. This is so-called mist lubrication, which is performed by coming into contact with a lubricating oil contained in the refrigerant in the form of mist and getting wet. However, the flow path for introducing the gas refrigerant from the low pressure side 48 into the space 50 that is limited by the outer surface side of the frame 5 and the outer surface side of the end plate 21 of the orbiting scroll 2 is the main bearing 52.
Since there is only a gap between the inner ring / outer ring and the ball, the amount of the inflowing gas refrigerant cannot be sufficiently secured, and the thrust bearing 53 around the space 50 and the horizontal key 72 of the Oldham link 7 are fitted and slid on the frame 5 , A key groove (not shown) formed in the outer peripheral edge of the end plate 21 of the orbiting scroll into which the vertical key 73 of the Oldham link 7 fits and slides, and a rotary bearing. There was a risk that lubrication to 34 and the like would be insufficient and seizure would occur in these sliding parts, impairing the reliability of the compressor.

The present invention is intended to solve the above-mentioned drawbacks of the prior art and to sufficiently lubricate the sliding portion in the space limited by the frame and the end plate of the orbiting scroll to improve the reliability. is there.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes a fixed scroll, an orbiting scroll, a rotation preventing mechanism, etc. in a closed housing formed by bolting a plurality of members. The present invention relates to a scroll type compressor having the following features in a scroll type compression mechanism, a frame to which a main bearing and the like are mounted, an electric motor, and the like. (1) The frame is provided with a passage for introducing the gas refrigerant sucked into the closed housing into a space limited by the frame and the end plate of the orbiting scroll. (2) In the scroll compressor described in the item (1), a plurality of the passages are provided.

[0013]

In the present invention, since the gas refrigerant (including the mist-like lubricating oil) flowing into the hermetically sealed housing has the above-described structure, the inner and outer rings of the main bearing and the balls, which have been the conventional flow paths, In addition to the gap of the above, it is possible to flow into the space limited by the outer surface side of the frame and the outer surface side of the orbiting scroll end plate through the passage formed in the frame, so that a sufficient gas refrigerant flow rate to the space is provided. Can be ensured and lubrication is sufficiently performed.

[0014]

1 is a vertical sectional view of a scroll type compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of a rotation preventing mechanism portion of the compressor, and FIG. A cross-sectional view of the compressor in the section, FIG. 2B is a BB line in FIG.
A sectional view and the same figure (c) are CC sectional views of the same figure (a).

In FIGS. 1 and 2, reference numeral 55 denotes a passage for introducing a gas refrigerant formed in the frame 5 for introducing the gas refrigerant (including mist-like lubricating oil) flowing into the low pressure side 48 in the closed housing 4. It is a passage for introducing into the space 50 that is limited by the outer surface side of the frame 5 and the outer surface side of the end plate 21 of the orbiting scroll 2. Other configurations and operations are the same as those of the conventional one shown in FIGS. 3 and 4, and corresponding members are designated by the same reference numerals, and the description thereof will be omitted.

Conventionally, the gas refrigerant introduction flow path from the low-pressure side 48 into the space 50 is only the gap between the inner ring / outer ring of the main bearing 52 and the ball, but the passage 55 is provided therein.
Is added, it is possible to secure a sufficient gas refrigerant flow rate into the space 50. Therefore, the lubrication of the thrust bearing, the key groove, the slewing bearing, etc. around the space is sufficiently retained, so that the sliding part is prevented from seizing and the reliability of the compressor is ensured. be able to.

[0017]

In the scroll compressor of the present invention, the gas refrigerant (including mist-like lubricating oil) sucked into the hermetically sealed housing is enclosed in the space limited by the frame and the end plate of the orbiting scroll. Since the passage to be introduced into the frame is bored in the frame, it is possible to sufficiently lubricate each sliding part in the space limited by the frame and the end plate of the orbiting scroll to improve reliability. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a rotation prevention mechanism portion of the compressor of the same embodiment, (a) is a cross-sectional view of the compressor in the rotation prevention mechanism portion, and (b) is a BB cross section of (a). The figure and (c) are CC sectional views of (a).

FIG. 3 is a vertical sectional view of a conventional scroll compressor.

FIG. 4 is a cross-sectional view of a rotation preventing mechanism portion in a conventional scroll compressor, (a) is a cross-sectional view of the compressor in the rotation preventing mechanism portion, and (b) is a BB section of (a). The figure and (c) are CC sectional views of (a).

[Explanation of symbols]

1 Fixed Scroll 2 Orbiting Scroll 4 Closed Housing 5 Frame 6 Rotation Blocking Mechanism 7 Oldham Link 21 End Plate 43 Left End Plate 48 Low Pressure Side 49 Right End Plate 50 Space Limited by Frame Outer Side and Orbiting Scroll End Plate Outer Side 52 main bearing 55 passage 56 bolt

Claims (2)

[Claims] 1. A frame in which a scroll type compression mechanism including a fixed scroll, an orbiting scroll, a rotation prevention mechanism, etc., a main bearing, etc. are mounted in an enclosed housing formed by bolting a plurality of members, and an electric motor. In the scroll type compressor in which the above-mentioned elements are arranged, a passage for introducing the gas refrigerant sucked into the closed housing into the space limited by the frame and the end plate of the orbiting scroll is opened in the frame. A scroll type compressor characterized by being installed. 2. The scroll compressor according to claim 1, wherein a plurality of the passages are provided.