JP2009243404A - Discharge port formation method for fixed scroll of scroll type compressor and scroll type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed scroll having an easy-to-form discharge port which can discharge gas from a compression chamber as much as possible and whose fixed convolution wall has excellent strength. <P>SOLUTION: The fixed scroll 18 is composed of a fixed base board 19, a fixed convolution wall 20 erected on the fixed base board 19, and a circumferential wall 181 fitted to a motor housing 14. A compression chamber 21 is formed between a movable convolution wall 17 and the fixed convolution wall 20 and between the mating surface 191 of the fixed base board 19 and the mating surface 161 of a movable base board 16. The discharge port 24 penetrating the fixed base board 19 is formed from a circular hole 27 formed at the back face 192 of the fixed base board 19 and a recess 28 to serve as an inlet to be opened in the mating surface 191 of the fixed base board 19. The circular hole 27 communicates with the recess 28 to serve as an inlet. The recess 28 is die-molded simultaneously with the die molding of the fixed scroll 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scroll type compressor that forms a compression chamber whose volume is reduced based on the revolution of the movable scroll between the movable spiral wall of the movable scroll that revolves so as not to rotate and the fixed spiral wall of the fixed scroll, and the scroll type The present invention relates to a method for forming a discharge port in a fixed scroll of a compressor.

In the scroll compressor disclosed in Patent Document 1, the discharge port provided on the end plate (substrate) of the fixed scroll includes a circular hole formed on the outer surface of the end plate, and a concave surface of the end plate (on the spiral side). And a communication passage formed on the surface). When the gas in the compression chamber is discharged from the discharge port, it is desirable to discharge the gas in the compression chamber as much as possible. The communication passage is provided to discharge gas as much as possible, but neither the communication passage nor the circular hole is formed so as to cut out the fixed spiral wall of the fixed scroll. Accordingly, the strength in the vicinity of the discharge port of the fixed spiral wall disclosed in Patent Document 1 is such that the discharge port formed so as to cut out the fixed spiral wall (for example, a circular hole cuts out the fixed spiral wall and communicates with the compression chamber). This is higher than the case of a discharge port having a different shape.
JP-A-1-187390

The communication passage is formed by cutting using an end mill. However, such a cutting process takes time.
An object of the present invention is to provide a fixed scroll having a discharge port that can discharge the gas in the compression chamber as much as possible, is excellent in securing the strength of the fixed spiral wall, and is easy to form.

  In the inventions of claims 1 to 3, the fixed scroll in which the fixed spiral wall is formed on the fixed substrate and the movable scroll in which the movable spiral wall is formed on the movable substrate are opposed to each other, and revolves so as not to rotate. A discharge chamber in a fixed scroll in a scroll compressor in which a compression chamber whose volume is reduced based on the revolution of the movable scroll is formed between the movable spiral wall of the movable scroll and the fixed spiral wall, and the fixed scroll is molded. According to a first aspect of the present invention, when the fixed scroll is molded, an inlet recess is simultaneously molded on the spiral wall side of the fixed substrate, and the fixed scroll of the fixed scroll is molded. A discharge port is formed by machining and forming an outlet hole that reaches the inlet recess from the back surface.

Since the concave portion for inlet that can discharge the gas in the compression chamber as much as possible is molded, the fixed spiral wall is not cut out, and the discharge port can be easily formed.
In a preferred example, the inlet recess is molded away from the fixed spiral wall.

The configuration in which the inlet recess is provided at a position away from the fixed spiral wall is preferable in terms of securing the strength of the fixed spiral wall.
In a preferred example, a part of the inlet recess overlaps with the outlet hole when viewed in the standing direction of the fixed spiral wall.

The passage cross-sectional area of the outlet hole can be set to the minimum necessary, and the strength near the discharge port can be easily secured.
According to a fourth aspect of the present invention, the fixed scroll having a fixed spiral wall formed on a fixed substrate and the movable scroll having a movable spiral wall formed on the movable substrate face each other, and the movable scroll that revolves so as not to rotate is movable. The present invention is directed to a scroll compressor in which a compression chamber whose volume is reduced based on revolution of the movable scroll is formed between a spiral wall and the fixed spiral wall, and the fixed scroll is molded. The recessed surface that has the discharge port formed by the forming method according to any one of 3 and forms the recess for inlet of the discharge port is a casting surface.

  The structure that leaves the casting surface formed by the mold forming contributes to the reduction in labor for forming the discharge port.

  The present invention is excellent in that it can discharge the gas in the compression chamber as much as possible, is excellent in securing the strength of the fixed spiral wall, and can provide a fixed scroll having an easily formed discharge port. There is an effect.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1A, the rotor 11 constituting the rotating electrical machine M is fixed to the rotating shaft 12, and the stator 13 constituting the rotating electrical machine M is disposed on the inner peripheral surface of the motor housing 14. It is fitted and fixed. The rotor 11 and the rotating shaft 12 are rotated by energization of the coil 131 of the stator 13. The movable scroll 15 constituting the scroll compressor 10 is turned by the rotation of the rotary shaft 12.

  The movable scroll 15 is composed of a movable substrate 16 and a movable spiral wall 17 erected on the movable substrate 16. The fixed scroll 18 fixed to the motor housing 14 includes a fixed substrate 19, a fixed spiral wall 20 erected on the fixed substrate 19, and a peripheral wall 181 fitted to the motor housing 14. A compression chamber 21 is formed between the movable spiral wall 17 and the fixed spiral wall 20 and between the opposed surface 191 of the fixed substrate 19 and the opposed surface 161 of the movable substrate 16. The volume of the compression chamber 21 decreases as the movable scroll 15 turns.

  The introduction port 22 provided on the peripheral wall of the motor housing 14 is connected to an external refrigerant circuit (not shown), and refrigerant (gas) is introduced from the external refrigerant circuit into the motor housing 14 via the introduction port 22. The refrigerant introduced into the motor housing 14 is sucked into the compression chamber 21 via the suction port 23 by the turning of the movable scroll 15. The refrigerant in the compression chamber 21 is discharged to the discharge chamber 26 by pushing the discharge valve 25 away from the discharge port 24 by the turning of the movable scroll 15. The refrigerant in the discharge chamber 26 flows out into the external refrigerant circuit and returns to the motor housing 14.

  As shown in FIGS. 1B and 1C, the discharge port 24 that penetrates the fixed substrate 19 includes a circular hole 27 that opens on the back surface 192 of the fixed substrate 19 and an inlet that opens on the opposing surface 191 of the fixed substrate 19. It is comprised from the recessed part 28 for use. A circular hole 27 serving as an outlet hole communicates with the inlet recess 28.

  As shown in FIGS. 2A and 2B, the entrance recess 28 opens in the vicinity of the start end 201 of the fixed spiral wall 20. That is, the entrance recess 28 is provided at a position away from the start end 201 of the fixed spiral wall 20 when viewed in the standing direction of the fixed spiral wall 20 (the axial direction of the rotary shaft 12). The passage sectional area of the circular hole 27 is smaller than the passage sectional area of the inlet recess 28.

Next, a method for manufacturing the fixed scroll 18 will be described with reference to FIGS. 3 (a), (b), and (c).
As shown in FIG. 3B, the fixed scroll 18 is molded by die casting using two molds 29 and 30. FIG. 3A shows a state in which the first mold 29 and the second mold 30 are combined. The first mold 29 and the second mold 30 are arranged to face each other. The combination mold obtained by combining these two molds 29 and 30 is filled with the molten metal N. FIG. 3B shows a state where the two molds 29 and 30 are separated.

  The first mold 29 forms the back surface 192 of the fixed substrate 19 and the outer peripheral surface 182 of the peripheral wall 181, and the second mold 30 includes the end surface 183 of the peripheral wall 181, the inner peripheral surface 184 of the peripheral wall 181, and the side wall surface of the fixed spiral wall 20. 202, the front end surface 203 of the fixed spiral wall 20, the opposing surface 191 of the fixed substrate 19, and the inlet recess 28 are formed. The recessed surface 281 that forms the entrance recess 28 is left as a cast surface.

As shown in FIG. 3C, a circular hole 27 is formed using a drill 31 in the fixed substrate 19 of the fixed scroll 18 that is molded.
In the first embodiment, the following effects can be obtained.

  (1) The inlet recess 28 is formed by molding into an opening shape (opening shape on the facing surface 191) capable of discharging the gas in the compression chamber 21 as much as possible independently of the circular hole 27. It can be formed. That is, the opening on the opposing surface 191 of the discharge port 24 can be disposed at a position where the fixed spiral wall 20 is not cut out and at a position where the gas in the compression chamber 21 can be discharged as much as possible. Therefore, it is easy to ensure the strength of the proximal end portion of the fixed spiral wall 20.

  (2) The configuration of leaving the casting surface of the inlet recess 28 formed by molding reduces the labor for forming the discharge port 24 compared to the case of cutting the inlet recess 28 with an end mill or the like. Contribute.

  (3) The passage cross-sectional area of the circular hole 27 that overlaps a part of the inlet recess 28 can be set to the minimum necessary for discharge. Therefore, even when the circular hole 27 is very close to the starting end 201 as viewed in the standing direction of the fixed spiral wall 20 or when a part of the circular hole 27 overlaps the starting end 201, the circular hole 27 A decrease in strength of the fixed scroll 18 in the vicinity of the discharge port 24 due to the presence of is suppressed.

Next, a second embodiment of FIG. 4 will be described. The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.
A recess 193 is molded on the back surface 192 of the fixed substrate 19 shown in FIG. FIG. 4B shows a state in which a circular hole 32 is formed by the drill 31 at the bottom of the recess 193. The circular hole 32 reaches the bottom of the inlet recess 28, and the inlet recess 28, the circular hole 32, and the recess 193 constitute the discharge port 24.

  In the second embodiment, since the concave portion 193 is molded in advance, the wall thickness for forming the circular hole 32 is thinner than that in the first embodiment. Therefore, the configuration in which the concave portion 193 is molded in advance facilitates the processing formation (penetration processing) of the circular hole 32.

Next, a third embodiment of FIG. 5 will be described. The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.
As shown in FIG. 5B, the inlet recess 28 </ b> A formed on the opposing surface 191 of the fixed substrate 19 is an inclined portion that gradually becomes deeper as the distance from the side wall surface 202 of the start end 201 of the fixed spiral wall 20 increases. 282. FIG. 5B shows a state in which the circular hole 27 is formed by the drill 31.

  As shown in FIG. 5A, the circular hole 27 is located away from the side wall surface 202 and opens at the deepest portion of the inclined portion 282. The inlet recess 28 </ b> A and the circular hole 27 constitute the discharge port 24.

  In the third embodiment, the thickness of the fixed substrate 19 near the start end 201 of the fixed spiral wall 20 is thicker than that of the first embodiment, and the strength of the start end 201 of the fixed spiral wall 20 is the first implementation. It becomes higher than the case of form. The configuration in which the inclined portion 282 is provided in the entrance concave portion 28 </ b> A is a simple configuration for securing the strength in the vicinity of the start end portion 201 of the fixed spiral wall 20.

In the present invention, the following embodiments are also possible.
In the first to third embodiments, the fixed scroll 18 and the inlet recess 28 are formed by die casting, but the present invention is not limited to this, and may be formed by forging or the like.

The technical idea that can be grasped from the embodiment described above will be described below.
[1] The scroll compressor according to claim 4, wherein the recessed portion has an inclined portion that gradually becomes deeper as the distance from the starting end portion of the fixed spiral wall increases.

    According to the configuration of the technical idea [1], the thickness of the fixed substrate in the vicinity of the start end portion of the fixed spiral wall is thicker than that in the case where the inclined portion is not provided. Therefore, it is easy to ensure the strength near the starting end of the fixed spiral wall.

1 shows a first embodiment, (a) is a side sectional view of the whole compressor. (B) is a partial expanded side sectional view. (C) is a partial enlarged front sectional view. (A) is the sectional view on the AA line of FIG. (B) is a partial enlarged line sectional view. (A), (b), (c) is a sectional side view for demonstrating a manufacturing process. (A), (b) is a partial expanded sectional side view for demonstrating the manufacturing process of 2nd Embodiment. (A), (b) shows 3rd Embodiment, (a) is a partial expanded rear view. (B) is the BB sectional drawing of Fig.5 (a).

Explanation of symbols

  10 ... Scroll type compressor. 15 ... Moveable scroll. 16: movable substrate. 17 ... Moveable spiral wall. 18: Fixed scroll. 19: Fixed substrate. 192 ... Back side. 20: Fixed spiral wall. 21 ... Compression chamber. 24: Discharge port. 27, 32: Circular holes as outlet holes. 28, 28A ... recess for entrance. 281 ... concave surface. 31 ... Drill.

Claims (4)

The fixed scroll having a fixed spiral wall formed on a fixed substrate and the movable scroll having a movable spiral wall formed on the movable substrate are opposed to each other, and the movable scroll wall and the fixed spiral wall of the movable scroll revolve so as not to rotate. In the discharge port forming method in the fixed scroll of the scroll compressor, the compression chamber having a volume decreasing based on the revolution of the movable scroll is formed between the fixed scroll and the molded scroll.
When forming the fixed scroll, the inlet recess is simultaneously formed on the spiral wall side of the fixed substrate, and the outlet hole reaching the inlet recess from the rear surface of the fixed substrate of the molded scroll is drilled. A discharge port forming method in a fixed scroll of a scroll compressor, wherein the discharge port is formed by forming a discharge port.   The discharge port forming method for a fixed scroll of a scroll compressor according to claim 1, wherein the inlet recess is molded at a position away from the fixed spiral wall.   3. The fixed scroll of the scroll compressor according to claim 1, wherein a part of the concave portion for the inlet overlaps with the outlet hole when viewed in the standing direction of the fixed spiral wall. Discharge port forming method. The fixed scroll having a fixed spiral wall formed on a fixed substrate and the movable scroll having a movable spiral wall formed on the movable substrate are opposed to each other, and the movable scroll wall and the fixed spiral wall of the movable scroll revolve so as not to rotate. In the scroll type compressor in which a compression chamber whose volume is reduced based on the revolution of the movable scroll is formed, and the fixed scroll is molded,
It has a discharge port formed by the formation method of any one of Claims 1 thru | or 3, The recessed surface which forms the recessed part for inlet_port | entrance of the said discharge port is provided with the fixed scroll which is a casting surface. Scroll type compressor.

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