JPH06221281A - Scroll compressor - Google Patents

Abstract

PURPOSE:To promote satisfactory lubrication of the respective bearings fitted to the outers of a bush and a crank pin by communicating a third passage opened to the point of a crank pin with a second passage near the closed end of the second passage to let a sufficient quantity of coolant gas which flows from the first passage into the second passage flow into the third passage. CONSTITUTION:When a shaft 30 is rotated by the drive of a motor 50, a movable scroll 20 is revolved while being checked from rotating on its own axis by a rotation checking mechanism 40. Whereupon, the capacity of a pressurization chamber 21 formed between the engaged spiral bodies 20b, 10b of both movable and fixed scrolls 20, 10 is decreased. Accordingly, coolant gas flows from an inlet port 4a of a rear housing 4 into a first passage 30a of the shaft 30. Some of coolant gas flows from a second passage 30b through a communicating hole 3b of a center housing 3 into an intake chamber 12. Some of coolant gas flows from the third passage 30c into a boss 20c of the movable scroll 20 to lubricate a needle bearing 35 fitted to the outer of a bush 34, and then flows into the intake chamber 12.

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 A fixed scroll having a housing and a spiral scroll formed on one surface of a plate member and fixed in the housing, and a spiral scroll of a fixed scroll formed on one surface of the plate member. Is arranged in the housing having an eddy wound body that forms a pressure chamber between the eddy wound body of the fixed scroll and an annular boss formed on the other surface of the plate member. A movable scroll, a shaft disposed in the housing and rotatably supported by the housing, and a crank pin eccentrically fixed at one end, and a shaft rotatably fitted to the crank pin via a bearing and a bearing. A bush that is rotatably fitted in the annular boss via the first passage extending from the vicinity of the one end to the other end, and the shaft passing through the shaft in the vicinity of the one end. There is known a scroll compressor in which a second passage that extends in the radial direction and communicates with the first passage and a third passage that communicates with the second passage at one end and opens at the tip of the crank pin at the other end are formed. Has been. In the scroll compressor, a part of the refrigerant gas (hereinafter simply referred to as refrigerant gas) containing the mist of lubricating oil flowing through the first passage formed in the shaft passes through the second passage and the third passage. Flow into the annular boss, and lubricate the bearing externally fitted to the crank pin and the bearing externally fitted to the bush.

[0003]

In the scroll type compressor having the conventional structure described above, most of the refrigerant gas flowing from the first passage into the second passage flows into the casing through the open end of the second passage. However, since the amount of the refrigerant gas flowing into the third passage is extremely small, the lubrication between the bearing fitted on the crank pin and the bearing fitted on the bush becomes insufficient, which causes wear and seizure of the crank pin and the bush. There was a problem. The present invention has been made in view of the above problems, and an object of the present invention is to provide a scroll compressor configured such that a sufficient amount of refrigerant gas flows into the third passage.

[0004]

In order to solve the above-mentioned problems, in the present invention, a housing and a spiral member formed on one surface of a plate member are provided in the housing.
Of the fixed scroll and the plate member that forms a pressure chamber between the fixed scroll that is fixed and the spiral scroll of the fixed scroll that is formed on one surface of the plate member and that is offset from the spiral scroll. A movable scroll having an annular boss formed on the other surface and disposed in the housing, and a movable scroll disposed in the housing and rotatably supported by the housing, and a crank pin eccentrically fixed to one end. A shaft, and a bush rotatably fitted on the crank pin via a bearing and rotatably fitted on an annular boss via the bearing. A first passage extending in the radial direction near the one end, one end opening to the side surface of the shaft and the other end closed, and a second passage communicating with the first passage.
Provided is a scroll compressor in which one end communicates with a second passage in the vicinity of the closed end and a third passage having the other end opened to the tip of a crankpin is formed. Further, in the present invention, the housing, the fixed scroll having the spiral wound body formed on one surface of the plate member and fixed in the housing, and the fixed scroll formed on one surface of the plate member Arranged in a housing having a spiral scroll that forms a pressure chamber between the spiral scroll and the spiral scroll of a fixed scroll that meshes with each other at an angle with respect to the spiral scroll and an annular boss formed on the other surface of the plate member. And a movable scroll that is disposed in the housing and is rotatably supported by the housing.
A shaft with an eccentric fixed crank pin at one end,
A first bush that rotatably externally fits to the crank pin via a bearing and rotatably internally fits to the annular boss via the bearing; A passage, a second passage extending radially through the shaft near the one end and communicating with the first passage, and a third passage having one end communicating with the second passage and the other end opening at the tip of the crankpin. And a communication portion between the third passage and the second passage is provided close to the side wall on the rear side in the rotation direction of the shaft of the second passage.

[0005]

In the present invention, since the third passage communicates with the second passage in the vicinity of the closed end of the second passage, the sufficient amount of the refrigerant gas flowing from the first passage to the second passage can be obtained. The quantity flows into the third passage. In the present invention, the third passage and the second passage
Since the communication portion with the passage is arranged close to the side wall on the rear side in the rotation direction of the shaft of the second passage, the rotation of the shaft in the refrigerant gas in the second passage causes the rotation of the second passage. A portion having a high pressure near the rear side wall in the rotation direction of the shaft surely flows into the third passage. That is, a sufficient amount of refrigerant gas flows into the third passage.

[0006]

Embodiments of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a compressor housing. The housing 1 includes a bottomed cylindrical front housing 2 having a common center axis X, a cylindrical center housing 3, and a bottomed cylindrical rear housing 4. A discharge port 2 a is formed on the bottom of the front housing 2 coaxially with the axis line X. In the center housing 3,
A bearing portion 3a and a communication hole 3b are formed coaxially with the axis line X. On the bottom of the rear housing 4, coaxial with the axis X,
An intake port 4a and a bearing portion 4b are formed. The front housing 2, the center housing 3, and the rear housing 4 are integrally connected by bolts 5 and 6.

A fixed scroll 10 is arranged in the front housing 2. The fixed scroll 10 includes a disk-shaped side plate 10a fitted to the front housing 2,
Swirl body 10b formed on one side surface of the side plate 10a
And a leg 10c formed on the other side surface of the side plate 10a. A discharge hole 10d is formed at the center of the side plate 10a. The fixed scroll 10 is fixed to the front housing 2 with bolts 11 in a state where the legs 10c are in contact with the bottom portion of the front housing 2. The inner space of the front housing 2 is partitioned into a suction chamber 12 and a discharge chamber 13 by the side plate 10a of the fixed scroll. A fixed scroll 10 is provided in the front housing 2.
A movable scroll 20 is disposed adjacent to. The movable scroll 20 includes a disc-shaped side plate 20a and a side plate 20a.
The spiral member 20b formed on one side surface of the side plate 2 and the side plate 2
0a and an annular boss 20c formed on the other side surface. Whirlpool 20b of movable scroll 20
Is a spiral scroll 10b of the fixed scroll 10 and 180
Engage with an angle deviation of °. A spiral scroll 10b of a fixed scroll and a spiral scroll 2 of a movable scroll
A pressure chamber 21 is formed between the pressure chamber 21 and 0b.

Center housing 3 and rear housing 4
A shaft 30 is arranged coaxially with the axis line X inside. The shaft 30 has one end rotatably supported by a bearing portion 3a of the center housing 3 via a bearing 31 and the other end rotatably supported by a bearing portion 4b of the rear housing 4 via a needle bearing 32. There is. A crank pin 33 is fixed to the one end of the shaft 30 so as to be eccentric from the axis X and parallel to the axis X. The crank pin 33 includes an eccentric hole 3 formed in a thick disk-shaped bush 34 through a needle bearing (not shown).
It is rotatably fitted in the 4a. The bush 34 is rotatably mounted on the boss 20c of the movable scroll via a needle bearing 35. As a result, the shaft 3
When 0 rotates, the orbiting scroll 20 revolves around the axis X, that is, makes a circular orbital motion. The shaft 30 has
Balance weights 36a, 36b, 36c for canceling the unbalanced force generated by the rotation are attached.

The shaft 30 has a first passage 30a extending coaxially with the axis X from the other end to a position near the one end. The passage 30a opens at the other end of the shaft 30. The opening faces a suction port 4a formed in the rear housing 4. As shown in FIGS. 1 and 2, a second passage 30b is formed in the shaft 30 in the vicinity of the one end so as to penetrate the shaft 30 in the radial direction orthogonal to the axis X and communicate with the first passage 30a. Has been done. One open end of the second passage 30b is closed by a stopper 37. The shaft 30 and the crank pin 33 are eccentric from the axis X and extend parallel to the axis X, and one end thereof is a stopper 37.
A passage 30c that communicates with the second passage 30b in the vicinity of and is open at the other end at the tip of the crank pin 33 is formed. Between the center housing 3 and the movable scroll 20,
A rotation blocking mechanism 40 having a ball coupling is provided. A motor 50 is arranged inside the center housing 3 and the rear housing 4. Mauri 50
Includes a rotor 51 and a stator 52. The rotor 51 is fixed to the shaft 30. Stator 5
2 is press-fitted and fixed to the rear housing 4.

The operation of the scroll compressor according to this embodiment having the above structure will be described. The shaft 30 is rotationally driven by the motor 50. The rotation of the shaft 30 causes the orbiting scroll 20 to move in a circular orbit around the axis X. The rotation of the movable scroll 20 associated with the circular orbital motion is
It is blocked by the rotation blocking mechanism 40. Movable scroll 2
A spiral scroll body 20b of a movable scroll and a spiral scroll body 10 of a fixed scroll which mesh with each other by a circular orbital motion of 0.
The pressurizing chamber 21 formed between b and b moves toward the center of the vortex winding while reducing its volume. Refrigerant gas containing mist of lubricating oil from the external refrigeration circuit is formed in the rear housing 4 as shown by the arrow.
It flows into the 1st passage 30a of the shaft 30 through a.
A part of the refrigerant gas flowing into the first passage 30a flows into the center housing 3 through the end opening of the second passage 30b as shown by the arrow, and further, the communication hole 3b formed in the center housing 3 is formed. Then, it flows into the suction chamber 12 through the gap formed in the rotation blocking mechanism 40. First passage 30
A part of the refrigerant gas flowing into the a passes through the third passage 30c as shown by a double arrow, and the boss 20 of the movable scroll.
After lubricating the needle bearing 35 and the needle bearing 35 which flow into c and are fitted on the crank pin 33,
It flows into the suction chamber 12 through the gap formed in the rotation blocking mechanism 40. Since one end of the third passage 30c communicates with the second passage 30b near the plug 37, the first passage 30a
A part of the refrigerant gas flowing from the second passage 30b into the boss 20c of the movable scroll surely passes through the third passage 30c.
It lubricates the needle bearing 35 and the needle bearing that flows into the crankshaft 33 and fits securely to the crank pin 33. The refrigerant gas flowing into the second passage suction chamber 12 is
After being taken into the pressurization chamber 21 and compressed in the pressurization chamber 21, it flows into the discharge chamber 13 through the discharge hole 10d, and further passes through the discharge port 2a formed in the front housing 2 to perform external refrigeration. It flows to the circuit.

In the second embodiment of the present invention shown in FIG.
The end of the passage 30b on the side close to the third passage 30c ends before reaching the side surface of the shaft 30. According to this structure, the plug 37 can be omitted. In the third embodiment of the present invention shown in FIG. 4, both ends of the second passage 30b are opened, and the communication portion 30d between the third passage 30c and the second passage 30b is arranged in the rotation direction of the shaft 30 of the second passage 30b. It is arranged close to the side wall on the rear side when viewed. According to such a configuration, a part of the refrigerant gas flowing from the first passage 30a into the second passage 30b, that is, the side wall of the second passage 30b on the rear side in the rotation direction of the shaft 30 due to the rotation of the shaft 30. The portion having a high pressure in the vicinity surely flows into the third passage 30c. In the fourth embodiment of the invention shown in FIG. 5, the second passage 3
0b is composed of _two passages 30b ₁ and 30b ₂ extending in parallel with each other, one end of which communicates with the first passage 30a and the other end of which opens to the side surface of the shaft 30. Passage 30b ₁
And 30b ₂ are arranged in such a positional relationship that the refrigerant gas discharged through the passages 30b ₁ and 30b ₂ generates torque in the same direction as the rotation direction of the shaft. The third passage 30c communicates with the passage 30b ₁ ,
Communicating portions 30d ₁ of the passage 30c and the passage 30b ₁ is disposed close to the side wall of the rear side as seen in the direction of rotation of the shaft 30 of the passage 30b _1. According to this structure, as in the third embodiment, a part of the refrigerant gas flowing from the first passage 30a into the second passage 30b ₁ surely flows into the third passage 30c. Further, since the refrigerant gas discharged through the passages 30b ₁ and 30b ₂ generates torque in the same direction as the rotation direction of the shaft, the load on the motor 50 is reduced.

[0012]

As described above, according to the present invention, the third
Since the passage communicates with the second passage in the vicinity of the closed end of the second passage, a sufficient amount of the refrigerant gas flowing from the first passage into the second passage flows into the third passage. Therefore, the bearing externally fitted to the bush and the bearing externally fitted to the crank pin are sufficiently lubricated and are not worn or seized. Further, in the present invention, the communication portion between the third passage and the second passage is arranged close to the side wall on the rear side in the rotation direction of the shaft of the second passage, so that the inside of the second passage is The portion of the refrigerant gas having a high pressure in the vicinity of the side wall on the rear side in the rotation direction of the shaft of the second passage due to the rotation of the shaft surely flows into the third passage. That is, a sufficient amount of refrigerant gas flows into the third passage. Therefore, the bearing externally fitted to the bush and the bearing externally fitted to the crank pin are sufficiently lubricated and are not worn or seized.

[Brief description of drawings]

FIG. 1 is a side view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view corresponding to FIG. 2 of a scroll compressor according to a second embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 2 of a scroll compressor according to a third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2 of a scroll compressor according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Housing 2 Front Housing 3 Center Housing 4 Rear Housing 10 Fixed Scroll 20 Movable Scroll 30 Shaft 30a First Passage 30b Second Passage 30c Third Passage 33 Crank Pin 34 Bush 35 Needle Bearing

Claims (2)

[Claims] 1. A fixed scroll having a housing and a spiral scroll formed on one surface of a plate member and fixed in the housing, and a spiral scroll of a fixed scroll formed on one surface of the plate member. Is arranged in the housing having an eddy wound body that forms a pressure chamber between the eddy wound body of the fixed scroll and an annular boss formed on the other surface of the plate member. A movable scroll, a shaft disposed in the housing and rotatably supported by the housing, and a crank pin eccentrically fixed at one end, and a shaft rotatably fitted to the crank pin via a bearing and a bearing. A bush that is rotatably fitted in the annular boss via the first passage that extends from the vicinity of the one end to the other end, and extends in the radial direction near the one end, A second passage having one end open to a side surface of the shaft and the other end closed to communicate with the first passage; and a second passage having one end communicating with the second passage near the closed end and the other end opening to the tip of the crank pin. A scroll compressor with three passages. 2. A fixed scroll having a housing and a spiral scroll formed on one surface of a plate member and fixed in the housing, and a spiral scroll of a fixed scroll formed on one surface of the plate member. Is arranged in the housing having an eddy wound body that forms a pressure chamber between the eddy wound body of the fixed scroll and an annular boss formed on the other surface of the plate member. A movable scroll, a shaft disposed in the housing and rotatably supported by the housing, and a crank pin eccentrically fixed at one end, and a shaft rotatably fitted to the crank pin via a bearing and a bearing. A bush that is rotatably fitted in the annular boss via the first passage that extends from the vicinity of the one end to the other end, and the shaft penetrates the shaft in the vicinity of the one end. A second passage communicating with the first passage, and a third passage having one end communicating with the second passage and the other end opening at the tip of the crank pin.
In the scroll compressor, the communication portion between the passage and the second passage is arranged close to the side wall on the rear side in the rotation direction of the shaft of the second passage.