JP2621037B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor used for an air compressor, a refrigerant compressor, and the like.

[Conventional technology]

FIG. 2 is a longitudinal sectional view of a conventional scroll compressor according to the technique disclosed in Japanese Patent Application Laid-Open No. 63-117191. In the figure, reference numeral 1 denotes a fixed scroll in which a spiral projection 1b is provided on the lower surface of a base plate portion 1a, and a discharge port 4 is opened at the center. Reference numeral 2 denotes an orbiting scroll provided on the upper surface of the base plate portion 2a, and an orbiting scroll combined with the orbital projection 1b. An orbiting shaft 2c is provided at a lower portion of a central portion. 3 is a suction port formed on the outer peripheral side between both scrolls 1 and 2, 5 is a compression chamber formed by both spiral projections 1b and 2b, 6 is a main shaft, and an eccentric hole is formed in a large diameter portion 6a at the upper end. 6b is provided to swing the swing scroll 2 via the swing bearing 18. The main shaft 6 is provided with an eccentric oil supply hole 6c eccentric from the shaft center. 7 is the main shaft 6
The centrifugal pump means is constituted by the oil cap fixed to the lower end of the oil pump and the oil supply hole 6c.

8 is an upper bracket for fixing the fixed scroll 1;
The orbiting scroll 2 is supported from below through an upper slide bearing 19, and the large diameter portion 6 a of the main shaft 6 is supported via an upper bearing 20.
Are supported in the radial direction. The upper bracket 8 is provided with a plurality of oil return holes 8a and a plurality of outer gas passages 8b. Reference numeral 9 denotes a lower bracket fixed to the lower container 12a, which fixedly supports the upper bracket 8, and supports the main shaft 6 from below and in a radial direction via a lower thrust bearing 21 and a lower bearing 22.

The lower bracket 9 is, as shown in FIGS. 3 and 4,
A balancer chamber 9a is provided in the upper part, an oil return groove 9b extending downward from the chamber to the side, and a gas branching concave part 9c and a plurality of branch gas grooves 9d are provided in the side circumference. A branch chamber 23 is formed between the circumference and the periphery. 9e is a plurality of ribs.
An upper branch hole 23a, a lower branch hole 23b, and a central branch hole 23c are provided in the partition wall of the gas branch concave portion 9c, and branch the suction gas from the suction pipe 16 in three directions.

Referring back to FIG. 2, reference numeral 10 denotes a driving motor, which comprises a rotor 11a fixed to the main shaft 6, and a stator attached to a lower portion of the lower bracket 9 by bolts (not shown).
Reference numeral 12 denotes a closed container in which the upper container 12b is hermetically coupled to the lower container 12a by welding or the like. Reference numeral 13 is interposed between the bracket 8 and the orbiting scroll 2, and prevents the orbiting scroll 2 from rotating and revolving. Oldham fittings to guide, 14 a sealing plate,
Reference numeral 15 denotes a sump formed at a lower portion in the closed container 12, and a lubricating oil
25 have been accumulated. 16 is a suction pipe airtightly fixed to the lower container 12a, 17 is fixed to the fixed scroll 1, and
This is the discharge pipe discharged through 12b.

Next, the operation of the conventional scroll compressor will be described. When the main shaft 6 is rotated by the rotor 11a of the electric motor 10, the orbiting scroll 2 revolves while being prevented from rotating by the Oldham coupling 13. As a result, the compression chamber 5 formed by the combination of the two spiral projections 1b and 2b moves toward the center side, gradually reduces the volume, increases the gas pressure, and is pressure-fed from the discharge port 4 by the discharge pipe 17. .

In this case, the suction gas is sucked from the suction pipe 16 and
As shown by the solid arrow, a part of the lower branch hole 23b
Through the space 26 between the back of the stator 11a and the lower container 12a,
The electric motor 10 is cooled by flowing through the lower end of the stator coil. However, the temperature of the diverted gas is increased by the stator 11a while passing through the space 26, and the diverted gas grooves shown in FIG. Most of the downward diverted gas from around the gas grooves A and B in 9d did not reach the lower end of the stator coil of the stator 11a and floated up. For this reason, the cooling of the electric motor 10 is insufficient.

On the other hand, a part of the suction gas in the branch chamber 23 rises in the gas passage 8b from the upper branch hole 23a, is taken into the compression chamber 5 from the suction port 3, and is compressed.

Further, the remainder of the suction gas in the branch chamber 23 flows through the upper end portion of the stator coil from the center branch hole 23c to be cooled, and reaches the suction port 3 through the branch gas groove 9d and the gas passage 8b. However, the gas passing through the central branch hole 23c is
Due to the negative pressure suction on the side, most of the gas passes through A and B, which are the end paths of the respective diverting gas grooves 9d, and the cooling is offset.

[Problems to be solved by the invention]

In the conventional scroll compressor as described above, the branch chamber 23
Most of the gas introduced into the diverting gas groove 9d through the lower diverting hole 23b and the central branching hole 23c passes through the shortest path A and B of each diverting gas groove 9d, and is suctioned at a negative pressure. And there is a problem that the cooling of the electric motor 10 is biased toward the gas introduction side to cause an inconvenience.

As a countermeasure, if the flow rate and flow velocity of the gas led from the branch name hole 23b are increased, the lubricating oil 25 of the lower oil sump 15 will be splashed and mixed into the gas, and the oil in the gas system of the compressor will There is a problem that the content is increased.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to obtain a scroll compressor in which a gas introduced into a branch chamber effectively cools an electric motor by simple means. The purpose is.

[Means for solving the problem]

In the scroll compressor according to the present invention, the bracket is provided with a flange portion whose outer periphery is in close contact with the inner periphery of the closed container, and a branch chamber is formed on a part of the side of the bracket with the inner periphery of the closed container, The gas is introduced from the suction pipe. The branch chamber is provided with an upper branch hole, a center-direction branch hole and a lower branch hole, and the flange portion is provided with an axial communication hole at a position opposite to the branch chamber, so that a branch which enters below the bracket. The gas is circulated to the upper part.

[Action]

In the present invention, a part of the gas introduced into the branch chamber from the suction pipe is sucked under a negative pressure from the upper branch hole to the suction port of the scroll portion above. Another part of the introduced gas is
It descends from the lower branch hole, circulates and cools the stator back part and the stator coil lower end part of the electric motor, is sucked up by a negative pressure through the communication hole of the flange part, rises, and enters the suction port of the upper scroll part. Further, the remaining portion of the introduced gas is cooled by flowing through the upper end of the stator coil from the central branch hole, is sucked by the negative pressure through the communication hole, rises, and enters the inlet of the scroll portion. Thereby, the electric motor is cooled almost uniformly and effectively.

〔Example〕

FIG. 1 is a perspective view of a lower bracket of a scroll compressor according to one embodiment of the present invention. In the figure, reference numeral 30 denotes a lower bracket, which is formed with a flange portion 30a at an upper portion and is in close contact with the inner periphery of the lower container 12a so as to partition the inside of the container 12 into an upper scroll portion side and a lower electric motor 10 side. .
30b is a balancer chamber, 30c is an oil return groove extending downward from the balancer chamber 30b to the side, 30d is a recess provided on a part of the outside,
A branch chamber 31 is formed between the lower chamber 12a and the inner periphery. Reference numeral 30e denotes a plurality of ribs extending downward, and the stator 11b is fixed to a lower portion. The upper branch hole 31a and the lower branch hole 3
1b and a central branch hole 31c are provided. Reference numeral 32 denotes one axial communication hole provided in the flange portion 30a at a position opposite to the branch chamber 31, and communicates the space between the lower side and the upper side of the lower bracket 30.

The structure of the scroll compressor according to the embodiment is the same as that of the conventional scroll compressor except for the lower bracket 30, and the description is omitted.

Electric motor by suction gas through the lower bracket 30
The cooling action of 10 is as follows. Branch from suction pipe 16
Part of the suction gas introduced into 31 is sucked into the suction port from upper branch hole 31a through gas passage 8b. In addition, branch room 31
The other part of the gas descends from the lower branch hole 31b, flows through the back of the stator 11b and the lower end of the stator coil, cools, rises, passes through the communication hole 32, the gas passage 8b, and is sucked. It is sucked in the mouth 3. At this time, since the space in the lower container 12a is partitioned by the flange portion 30a into the scroll portion side and the electric motor 10 side, the entire amount of the gas descending to the electric motor 10 effectively cools. Further, the remainder of the gas in the branch chamber 3 is
Cooling is performed by flowing through the upper end of the stator coil from the central branch hole 31c, and is sucked into the suction port 3 through the communication hole 32 and the gas passage 8b.

〔The invention's effect〕

As described above, according to the present invention, the bracket is provided with the flange portion, the space is divided into the upper scroll portion side and the lower motor portion side in close contact with the inner periphery of the sealed container, and a part of the outside of the bracket is provided. A branch chamber is formed between the container and the closed vessel to introduce gas from the suction pipe. The branch chamber is provided with an upper branch hole, a center branch hole, and a lower branch hole, and the flange portion is branched. Since an axial communication hole is provided at a position opposite to the chamber, of the gas introduced into the branch chamber, the gas from the lower branch hole descends and flows through the lower end of the stator coil of the electric motor to cool, Ascending through the communication hole, the gas from the branching hole in the center direction among the gas in the branching chamber flows through the upper end side of the stator coil and cools, and is raised through the communication hole. Is cooled almost uniformly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lower bracket of a scroll compressor according to one embodiment of the present invention, FIG. 2 is a sectional view of a conventional scroll compressor, and FIGS. 3 and 4 are diagrams of the lower bracket of FIG. It is a top view and a perspective view. 1 ... fixed scroll, 1a ... base plate part, 1b ... spiral projection, 2 ... swinging scroll, 2a ... base plate part, 2b ... spiral projection, 4 ... discharge port, 5 ... compression chamber , 6 ... spindle, 6a ...
… Large diameter part, 6b …… Eccentric hole, 8 …… Upper bracket, 8b…
... gas passage, 10 ... electric motor, 11a ... rotor, 11b ... stator, 12 ... sealed container, 16 ... suction pipe, 25 ... lubricating oil,
30 lower bracket, 30a flange portion, 30d recess, 31 branch chamber, 31a upper branch hole, 31b lower branch hole, 31c central branch hole, 32 communication hole In the drawings, the same reference numerals indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-117378 (JP, A) JP-A-61-265380 (JP, A) JP-A-60-224991 (JP, A) JP-A 57-117 198384 (JP, A) Japanese Utility Model Showa 63-12687 (JP, U) Japanese Utility Model Showa 61-37492 (JP, U)

Claims (1)

(57) [Claims] 1. A fixed scroll having a spiral projection provided below a base plate portion and a discharge port opened upward at a center portion, and a spiral projection provided above a base plate portion and combined with the spiral projection. A plurality of compression chambers are formed between them, and a oscillating scroll compresses the fluid in the compression chambers by oscillating motion and discharges the fluid from the discharge port. A main shaft that receives the driving shaft portion and performs oscillating movement by rotation, a bracket that supports the oscillating scroll via a thrust bearing, and supports the main shaft through bearing means, and a rotor that is closer to a lower portion of the main shaft. And an electric motor fixed to the lower part of the bracket,
A scroll compressor having a bracket, a scroll portion, and a motor portion, and a closed container into which a suction pipe is connected to an outer portion and into which suction gas is introduced, wherein the bracket is in close contact with an inner periphery of the closed container. It is provided on a part of the lower part and the side part of the lower part,
A concave portion that forms a branch chamber into which gas is introduced from the suction pipe between the inner periphery of the closed container and an upper branch hole that is provided in the branch chamber and branches the suction gas upward; and a lower branch hole that branches the suction gas downward. A scroll compressor comprising: a branch hole, a central branch hole for branching intake gas upward from the electric motor, and a communication hole provided in a flange portion in an axial direction at a position opposite to the branch chamber.