JP2884883B2 - Refrigerant gas discharge structure in scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression chamber whose volume is reduced between a fixed scroll and a movable scroll which is opposed to the fixed scroll so as to be non-rotatable and revolvable, based on the revolution of the movable scroll. The present invention relates to a refrigerant gas discharge structure in a scroll compressor to be formed.

[0002]

2. Description of the Related Art The compression chamber converges between the start ends of the spiral walls of the fixed scroll and the movable scroll, and compressed refrigerant gas in the compression chamber is discharged from a discharge port provided on a scroll substrate of the fixed scroll. You. Due to such a compression stroke, a larger compression reaction force acts on the start end of the spiral wall than on other parts. Therefore, the starting end of the spiral wall is required to have higher pressure resistance than other parts.

Japanese Patent Application Laid-Open No. 59-58187 discloses a scroll type compressor in which the starting end of a spiral wall is formed thick. In general, the spiral wall of both scrolls uses an involute curve from the beginning to the end of both the outer wall and the inner wall, but in this conventional device, a part of the inner wall at the beginning of the spiral wall has a linear shape. . By adopting this linear shape, the inner wall surface of the spiral wall start end protrudes, and the thickness of the spiral wall start end increases on both the inner and outer wall surfaces compared to the involute curve adoption. This increase in thickness increases the pressure resistance of the spiral wall start end.

In order to improve the performance of a compressor, a high sealing performance and a low discharge resistance are required in addition to the improvement of the pressure resistance. In order to enhance the sealing property between the sliding portions of the scroll substrate and the end surface of the spiral wall of both scrolls, for example, Japanese Utility Model Publication No. 63-25345
As disclosed in Japanese Unexamined Patent Publication, there is a measure for interposing a seal member between the scroll substrate and the end surface of the spiral wall. In addition, the discharge resistance affects the generation of discharge pulsation causing noise and the operating efficiency.
In the scroll type compressor disclosed in Japanese Patent No. 60093, a notch groove communicating with the discharge port is formed at the beginning of the spiral wall of the fixed scroll to take measures to increase the hole diameter of the discharge port.

[0005]

In order to prevent the refrigerant gas once compressed in the compression chamber in the discharge stroke from re-expanding in the subsequent compression chamber, the discharge port should not enter the subsequent compression chamber when the discharge is completed. Therefore, the size of the hole diameter of the discharge port is restricted. JP-A-59-
In the case where the spiral wall start end portion disclosed in Japanese Patent No. 58187 is adopted, the hole diameter of the discharge port can be increased. This is because the area of the scroll wall start end on the movable scroll side that covers the discharge port increases due to the increase in the thickness of the scroll wall start end. However, simple enlargement of the hole diameter of the discharge port affects the position of the seal member. The starting position of the seal member has a great effect on the prevention of high-pressure gas leakage in the compression chamber connected to the discharge port, and the starting position of the seal member is preferably as close to the start of the spiral wall as possible. If the hole diameter of the discharge port is simply enlarged, the seal member that moves integrally with the orbiting scroll and the discharge port overlap. Such overlap leads to a decrease in the sealing performance between the seal member and the substrate, and the start end of the movable scroll side seal member cannot extend beyond the relative position of the discharge port at the time of completion of discharge to near the start end of the spiral wall.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerant gas discharge structure in a scroll type compressor which provides a high pressure resistance, a high sealing property and a low discharge resistance at the beginning of a spiral wall.

[0007]

According to the present invention, there is provided:
At the time when the discharge of the refrigerant gas in the compression chamber from the discharge port on the scroll substrate of the fixed scroll is completed, the inner wall surfaces of the spiral walls of the scrolls are formed so as to secure a space in the compression chamber, and the spiral wall starts. The thickness of the scroll wall is made larger than the thickness of the other part of the scroll wall, and a scroll-shaped sealing member that slides on the scroll substrate is interposed between the scroll substrate facing each scroll and the tip end surface of the scroll wall, At the time of forming the gap, the discharge port is connected to the gap between the start end position of the seal member on the movable scroll side and the wall surface facing the gap of the spiral wall of the fixed scroll, and the peripheral edge of the port is connected to the fixed scroll. Swirl
It was provided so as to be separated from the wall .

[0008]

When the discharge of the refrigerant gas is completed, a gap is secured between the start ends of the spiral walls of the fixed scroll and the movable scroll, and the discharge port communicates with the gap. Therefore, the refrigerant gas in the compression chamber that converges between the spiral wall start ends is not over-compressed.

By making the thickness of the spiral wall start end larger than the thickness of the other part of the spiral wall, the pressure resistance of the spiral wall start end is increased, and the area of the movable scroll side spiral wall start end covering the discharge port is increased. Increase. By disposing a discharge port between the start end of the spiral seal member interposed between the scroll substrate on the fixed scroll side and the spiral wall on the movable scroll side and the gap, the start end position of the seal member is movable. It can be as close as possible to the beginning of the scroll wall.

When the discharge port is arranged between the starting end of the sealing member and the gap, the passage cross section of the discharge port can be ensured by making the discharge port enter the spiral wall of the fixed scroll or making the hole shape other than circular. It is done by making it irregular. In this case, if the edge of the discharge port is separated from the inner wall surface of the spiral wall start end, the durability of the spiral wall start end is compared with the case where the edge of the discharge port is in contact with the inner wall surface of the spiral wall start end. Get better.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
Explanation will be given based on FIG. As shown in FIG. 1, a front housing 2 is joined and fixed to a fixed scroll 1 also serving as a rear housing. An annular fixed substrate 3 is fitted and fixed in the outer peripheral wall of the fixed scroll 1 so as to be in contact with the front end surface of the front housing 2.

A rotary shaft 4 is rotatably supported in the front housing 2. An eccentric shaft 5 is formed integrally with the rotating shaft 4. The eccentric shaft 5 protrudes through the central hole of the fixed substrate 3 and into the surrounding area of the outer peripheral wall of the fixed scroll 1.

A balance weight 6 and a bush 7 are rotatably supported on the eccentric shaft 5. The bushing 7 is rotatably supported movable scroll 8 is joined stationary scroll 1 and the opposing scroll substrate 1a of the scrolls l, 8, 8a and spiral walls 1b, the compression chamber S by 8b, is S ₀ form Is done.

A fixed ring 9 is fixed to the surface of the fixed substrate 3 facing the movable scroll 8.
, A plurality of circular orbital position regulating holes 9a are provided at evenly spaced positions. Scroll substrate 8 of movable scroll 8
A movable ring 10 is fixed to the back surface of a. The movable ring 10 is provided with a circular orbital position regulating hole 10a at an evenly spaced position. Disc-shaped shoes 11A and 11B having a smaller diameter are inserted into the orbiting position regulating holes 9a and 10a, and a ball 1 is inserted between the opposed shoes 11A and 11B.
2 is interposed.

The two shoes 11A, 11B and the ball 12 are press-fitted between the fixed substrate 3 and the orbiting scroll 8 by a compression reaction, and are apparently integrated. Shoe 11A,
11B has a circular movable area in the orbiting position regulating holes 9a and 10a, and the movable diameter of the shoes 11A and 11B matches the orbital radius of the eccentric shaft 5. Therefore, FIG.
As shown by a chain line, all the shoes 11A and 11B orbit the orbital position regulating holes 9a and 10a while being sandwiched between the peripheral surfaces of the orbital position regulating holes 9a and 10a by the revolution of the eccentric shaft 5, and the movable scroll 8 revolves without rotating.

The refrigerant gas introduced from the inlet 1c on the outer peripheral wall of the fixed scroll 1 flows into the compression chamber S between the scrolls 1 and 8. The volume of the compression chamber S decreases with the revolution of the orbiting scroll 8, and the scroll walls 1 b,
It converges between the start ends 1e and 8c of 8b. The refrigerant gas compressed by the volume reduction of the compression chambers S, S ₀ is discharged from the discharge port 1 d on the scroll substrate 1 a into the discharge chamber 13. The discharge port 1d is openably closed by the discharge valve 14 on the discharge chamber 13 side.

Sealing members 15 and 16 are fitted and supported on the tip surfaces of the spiral walls 1b and 8b. The seal member 15 is in contact with the scroll substrate 8a of the movable scroll 8, and the seal member 16 is in contact with the scroll substrate 1a of the fixed scroll 1. The two seal members 15 and 16 are in sliding contact with the scroll substrates 8a and 1a as the movable scroll 8 revolves. As shown in FIG. 4, the start ends 1e, 8c of both spiral walls 1b, 8b.
Are thicker than other portions of the spiral walls 1b and 8b. Thickness formation of beginning 8c is arcuate R _11, R ₁₂ and the straight line L ₁
And the thickness of the starting end 1e is formed by arcs R ₂₁ ,
Performed connects the R ₂₂ and the line L _2. The arcs R ₁₁ and R ₂₁ have the same radius and the same length, and the arcs R ₁₂ and R ₂₂ have the same radius and the same length. Lines L ₁ is the common tangent of the circular arc R _11, R _12, the straight line L ₂ is a common tangent of the circular arc R _21, R _22.

The inner and outer wall surfaces of the spiral walls 1b, 8b have involute curves E ₁ , E except for a part of the start ends 1e, 8c.
₂ Involute curves E ₁ and E _{2 of the} spiral wall 8b
Is created from the base circle C ₀ . The arcs R ₁₁ , R ₂₁ are smoothly connected to the involute curve E ₁ , and the arcs R ₁₂ , R ₂₁
R ₂₂ is smoothly connected to the involute curve E _2. Connection point of the arc R ₁₁ and involute curve E ₁ p ₁
Is the end position of the involute of any involute angle alpha, arc R ₂₁
A connection point p ₂ between the involute curve E ₂ and the involute curve E ₂ is the tip position of the extension line at the extension angle (α + 180 °) further advanced by 180 ° from the extension angle α. The spiral wall 1b is made similarly. With such a wall shape, the straight lines L ₁ and L ₂ are joined at a predetermined revolution position of the movable scroll 8 as shown in FIG.

As shown in FIG. 5, a spiral seal member 1 is provided.
Involute curve E at the beginning of 5,16₁, E_TwoBetween
It is sandwiched and extends to near the start ends of the start ends 1e and 8c.
Straight line L ₁, L_TwoAre joined, that is, the compression chamber S₀Or
When the discharge of refrigerant gas to the protruding port 1d is completed,
The discharge port 1d is sandwiched between the starting ends of the sealing members 15 and 16.
It is in a state of being caught.

[0020] The wall surface of the straight line L ₂ void formation groove 1f is formed. The hole shape of the discharge port 1d is substantially elliptical, and a part of the hole edge of the discharge port 1d is
f. That is, at the time of completion of the discharge of the refrigerant gas, the discharge port 1d is relatively disposed between the start end of the seal member 16 and the gap forming groove 1f, and the gap S ₁ formed between the start ends 1e and 8c. Communicates with the discharge port 1d. Notch 8d is formed in the corner between the wall and the starting end 8c distal end surface of the straight line L _1. Notch 8
When the two straight lines L ₁ and L ₂ are joined, d faces the gap forming groove 1f and communicates with the discharge port 1d.

FIG. 5 and the gap S ₁ is formed in the projecting end point shown in FIG. 6 prevents overpressure <br/> shrinkage in the final compression process in the compression chamber S _0. Moreover, it notches 8d relaxes the resistance to the discharge of the refrigerant gas from the compression chamber S ₀ to the discharge port 1d. Therefore, noise due to overcompression or discharge resistance is reduced.

As shown in FIG. 5 , since the seal member 16 and the discharge port 1d do not overlap in the revolving region of the seal member 16, the start end of the seal member 16 extends to near the start end of the start end 8c of the spiral wall 8b. Does not impair the high sealing performance.

The starting end of the sealing member 16 and the gap forming groove 1f
In a configuration in which the discharge port 1d is arranged in a limited area between the discharge ports 1 and 2, the size of the discharge port 1d is limited. However, the adoption of the wall surface shape of the straight line L ₁ which projects from the inside of the involute curve E ₂ in this embodiment,
The area of the start end 8c on the movable scroll 8 side covering the discharge port 1d is greatly increased as compared with a scroll employing only the involute curve. Therefore, the passage cross-sectional area of the discharge port 1d can be enlarged. If the periphery of the discharge port 1d is inserted into the gap forming groove 1f, the discharge port 1d is further increased.
Can be enlarged. In this case, the gap forming groove 1f
Is essentially important, and if there is no gap forming groove 1f, the peripheral edge of the discharge port 1d only penetrates below the spiral wall 1b of the fixed scroll 1, and the discharge port 1d
Cannot be substantially increased.

An advantageous configuration in which the discharge resistance is reduced by increasing the cross sectional area of the discharge port 1d is as follows.
This is made possible by increasing the thickness of the start ends 1e, 8c. Although the peripheral edge of the discharge port 1d and the formation surface of the gap forming groove 1f may overlap each other, the configuration in which the peripheral edge of the discharge port 1d is separated from the formation surface of the void formation groove 1f as in the present embodiment is advantageous in terms of pressure resistance. Is advantageous. That is, the peripheral edge of the discharge port 1d is separated from the surface on which the gap forming groove 1f is formed, so that the surface on which the gap forming groove 1f is formed and the scroll substrate 1a are separated.
And a concave corner portion 1g is formed. The presence of the concave corner portion 1g disperses the stress as compared with the case where the surface on which the gap forming groove 1f is formed and the peripheral surface of the discharge port 1d are flush, and the starting end portions 1e and 8c
Is improved in pressure resistance.

The present invention is, of course, not limited to the above-described embodiment, and for example, the embodiments shown in FIGS. 7 and 8 are also possible. In the embodiment shown in FIG. 7, the concave surface 1g between the surface on which the gap forming groove 1f is formed and the scroll substrate 1a is formed into a curved surface. By adopting such a curved surface, the degree of stress distribution is further improved. Therefore, the pressure resistance of the starting end portion 1e is further improved as compared with the embodiment.

[0026] In addition, of the variable dynamic scroll 8 side notch 8d
May be omitted. In the embodiment of FIG. 8, the discharge port 1d
Is formed into an oval shape along the straight lines L ₁ and L ₂ , and a part of the periphery is inserted into the gap forming groove 1 f. The shape of the compression chamber S ₀ of the final stage becomes progressively long thin but oval shape of the discharge port 1d is along the elongated shape of the compression chamber S _0,
The flow of the refrigerant gas is improved. That is, the ejection resistance is reduced.

[0027] Also, Ru Oh the present invention can be applied with respect to scroll shape disclosed in Figure 5 of JP 59-5818 7 JP. In this scroll shape, portions corresponding to the wall surfaces of the straight lines L ₁ and L _{2 in} the above embodiment are slightly concave, and a long and narrow gap is formed between the start ends of both spiral walls when the discharge is completed.

[0028]

As described above in detail, according to the present invention, the thickness of the spiral wall start end portion is made larger than the thickness of the other portion of the spiral wall, and a gap is formed between the scroll end portions when the discharge is completed. , the Po discharge port communicating with the gap
So that the peripheral edge of the
Since there is provided between the starting end position of the discharge completion time of the seal member and the gap in the high <br/> have pressure resistance based on the stress distribution of the spiral wall beginning, provides high sealability and low discharge resistance It has an excellent effect of obtaining.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an entire compressor according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged side view of a main part near the center of a scroll.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is an enlarged front sectional view of a main part showing a discharge completion state.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is an enlarged side sectional view of a main part showing another example.

FIG. 8 is an enlarged front sectional view of a main part showing another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll 1a ... Scroll board | substrate, 1b ... Spiral wall, 1d ... Discharge port, 1e ... Start end part, 1f ... Void formation groove, 8 ... Movable scroll, 8a ... Scroll board, 8
b: spiral wall; 8c: starting end; 15, 16: sealing member;
S, S ₀ ... compression chamber, S ₁ ... void.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tetsuo Yoshida 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (56) References JP-A-1-290988 (JP, A) JP-A Sho 64-63686 (JP, A) Japanese Utility Model 63-196493 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A scroll compressor having a compression chamber whose volume is reduced based on the revolution of a movable scroll between a fixed scroll and a movable scroll which is non-rotatably and revolvably supported in opposition to the fixed scroll. At the time when the discharge of the refrigerant gas in the compression chamber from the discharge port on the scroll substrate of the fixed scroll is completed, the inner wall surfaces of the start ends of the scroll walls of both scrolls are formed so as to secure a gap in the compression chamber, and the spiral wall is formed. The thickness of the starting end is made larger than the thickness of the other part of the scroll wall, and a scroll-shaped sealing member that slides on the scroll substrate is interposed between the scroll substrate and the tip surface of the scroll wall of each scroll. And the wall surface of the spiral scroll of the fixed scroll facing the gap at the start end position of the seal member on the movable scroll side when the gap is formed. Spiral periphery of the fixed scroll of the port said discharge port in a position to be connected to the gap between the
Refrigerant gas discharge structure in a scroll compressor provided so as to be separated from a wall .