JP2001073972A - Discharge structure of scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve compression efficiency when a discharge port is formed in a moving scroll base plate. SOLUTION: A discharge port 25 and a containing hole 26 are recessed in a moving scroll base plate 33. The discharge port 26 communicates with the discharge port 25. A disc-shasped valve element 29 is containing in a floating state in the containing hole 26. A snap ring 30 is locked in a fitted-in state at the peripheral wall of the containing hole 26. A gas passage 261 is notched in the peripheral wall of the containing hole 26. The valve element 29 containing in a floating state in the containing hole 26 is moved between a closing position where, as shown by a solid line, the valve element makes contact with the discharge port 25 and the bottom 263 of the containing hole 26 to close the discharge port 25 and an opening position where, as shown by a chain line, the valve element makes contact with the snap clip 30 to open the discharge port 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed scroll having a fixed scroll wall formed on a fixed scroll substrate and a movable scroll having a movable scroll wall formed on a movable scroll substrate. The present invention relates to a discharge structure in a scroll compressor in which a closed space whose volume decreases based on the revolution of the movable scroll is formed between the movable scroll wall on the movable scroll side and the fixed scroll wall.

[0002]

2. Description of the Related Art The closed space converges between the inner ends of the scroll walls of the fixed scroll and the movable scroll based on the revolution of the movable scroll. The compressed gas in the final sealed space converged between the inner end portions is discharged from a discharge port communicating with the final sealed space. The discharge port is provided on a fixed scroll substrate as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 4-93781,
No. 3, JP-A-6-264875, which is provided on a movable scroll substrate.

In a configuration in which a discharge port is provided on a substrate of a fixed scroll, it is necessary to provide a discharge chamber on the back side of the fixed scroll substrate, but the presence of the discharge chamber increases the overall length of the compressor.

In the configuration in which the discharge port is provided in the movable scroll substrate, it is not necessary to provide a discharge chamber on the back side of the fixed scroll substrate, and the problem that the total length of the compressor is increased due to the presence of the discharge chamber is solved.

In the device disclosed in Japanese Patent Application Laid-Open No. 6-264875, the discharge port is opened and closed by a discharge valve that is deformed and deformed, and the opening of the discharge valve is regulated by a retainer. The discharge valve and the retainer are attached to the movable scroll board by screws, but securing the space required for such an attachment structure increases the overall length of the compressor.

In the device disclosed in Japanese Patent Application Laid-Open No. 2-227585, a discharge port provided on a movable scroll substrate communicates with a discharge hole in a rotary shaft, and a check valve is provided in the discharge hole.

[0007]

The check valve is of the float valve type, and the float valve type check valve has the advantage that the installation space can be reduced as compared with the flexural deformation of the discharge valve. However, the configuration in which the check valve is disposed in the discharge hole in the rotating shaft also makes the gas passage from the final sealed space to the check valve a part of the final sealed space,
The gas in the gas passage is recompressed in the next final enclosed space. The greater the amount of gas to be recompressed, the lower the volume efficiency and the worse the compression efficiency.

An object of the present invention is to improve the compression efficiency when a discharge port is provided in a movable scroll substrate.

[0009]

According to a first aspect of the present invention, a discharge port is provided on a movable scroll substrate, and the movable scroll substrate is moved by a gas flow between an open position for opening the discharge port and a closed position for closing the discharge port. The movable scroll substrate is provided with a discharge opening / closing means provided with a valve element.

The gas passage from the final closed space to the discharge opening / closing means is short, and the amount of gas to be recompressed is reduced as compared with the conventional case.
According to a second aspect of the present invention, in the first aspect, a receiving hole recessed in the rear surface of the movable scroll substrate so as to be continuous with the discharge port, the valve body received in the receiving hole, and the receiving hole The discharge opening / closing means includes an opening position regulating means for preventing the valve body from coming off from inside and regulating the opening position of the valve body.

The structure in which the valve body is housed in the housing hole formed in the movable scroll substrate is most suitable for shortening the gas passage from the final sealed space to the discharge opening / closing means. According to a third aspect of the present invention, in the second aspect, a circlip fitted to a side wall of the accommodation hole is used as the open position regulating means.

The circlip is most suitable as an opening position regulating means. In the invention of claim 4, claims 1 to 3
Any one of the above, further comprising a revolving mechanism for revolving the orbiting scroll by transmitting a rotating force of a rotating shaft, the revolving mechanism comprising: an eccentric shaft that rotates integrally with the rotating shaft; and the eccentric shaft and the movable shaft. Bearing means interposed between the movable scroll substrate and the scroll, and the discharge opening / closing means is provided in the axial direction of the rotating shaft. In the surrounding area of the tube.

[0013] The inside of the surrounding area of the cylinder is optimal as the arrangement position of the discharge port, and therefore, the inside of the surrounding area of the cylinder is optimal as the arrangement position of the discharge opening / closing means. According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a motor for driving the rotating shaft is incorporated.

The gas discharged from the discharge port on the movable scroll substrate can be used for cooling the motor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, a center housing 12 is joined to the fixed scroll 11, and a motor housing 13 is joined to the center housing 12. Center housing 12 and motor housing 13
, A rotating shaft 14 is rotatably supported via radial bearings 15 and 16, and an eccentric shaft 17 is formed integrally with the rotating shaft 14.

A balance weight 18 and a bush 19 are supported on the eccentric shaft 17. A movable scroll 20 is supported by the bush 19 via a needle bearing 21 so as to be relatively rotatable so as to face the fixed scroll 11. The needle bearing 21 is a cylinder 3 protruding from the back surface of the movable scroll substrate 33 of the movable scroll 20.
32. The fixed scroll substrate 31 and the fixed spiral wall 32 of the fixed scroll 11 and the movable scroll substrate 33 and the movable scroll wall 34 of the movable scroll 20 form closed spaces So and S1, as shown in FIG. The orbiting scroll 20 revolves with the rotation of the eccentric shaft 17, and the balance weight 18 cancels the centrifugal force caused by the orbiting motion of the orbiting scroll 20. The eccentric shaft 17, the bush 19, which rotates integrally with the rotating shaft 14, and the needle bearing 21 interposed between the eccentric shaft 17 and the cylinder 332 of the movable scroll 20, constitute a revolving mechanism. Needle bearing 2
1 is a bearing means.

The orbiting ring 22 is interposed between the movable scroll substrate 33 and the center housing 12.
A plurality of (four in the present embodiment) rotation prevention pins 23 having a columnar shape penetrate and are fixed to the revolving ring 22. An annular pressure receiving plate 24 is interposed between the center housing 12 and the turning ring 22. As shown in FIG. 3, the pressure receiving plate 24 is provided with the same number of rotation prevention holes 241 as the rotation prevention pins 23 in the circumferential direction. The same number of rotation prevention holes 331 as the rotation prevention pins 23 are arranged in the movable scroll substrate 33 in the circumferential direction. Anti-rotation hole 24
The reference numerals 1 and 331 are arranged at equally spaced angular positions. The ends of the rotation preventing pins 23 are inserted into the rotation preventing holes 241, 331.

A stator 27 is fixed to the inner peripheral surface of the motor housing 13, and a rotor 28 is supported on the rotating shaft 14. The stator 27 and the rotor 28 constitute a motor, and the rotor 28 and the rotating shaft 14 rotate integrally by energizing the stator 27.

With the rotation of the eccentric shaft 17 formed integrally with the rotary shaft 14, the orbiting scroll 20 revolves and the entrance 111
The refrigerant gas introduced from above flows into the space between the fixed scroll substrate 31 and the movable scroll substrate 33 from the peripheral side of both scrolls 11 and 20. With the revolution of the orbiting scroll 20, the peripheral surface of the rotation preventing pin 23 becomes the rotation preventing holes 331, 24.
The sliding contact is made along the peripheral surface of No. 1. Anti-rotation holes 331, 241
The relationship of D = d + r is set among the diameter D of the rotation prevention pin 23, the diameter d of the rotation prevention pin 23, and the revolution radius r of the bush 19.
By this relationship, the orbital radius of the orbiting scroll 20 is defined as r, and the orbiting ring 22 revolves at a radius of の of the orbital radius r of the orbiting scroll 20.

The turning ring 22 tends to rotate. However, since the three or more rotation prevention pins 23 are in contact with the inner peripheral surface of the rotation prevention hole 241 in which the rotation ring 2 is fixed, the rotation ring 2
2 does not spin. The orbiting scroll 20 tends to rotate around the central axis of the bush 19. But,
Since the inner peripheral surface of the rotation preventing hole 331 on the movable scroll substrate 33 is in contact with three or more rotation preventing pins 23 on the orbiting ring 22 that does not rotate, the movable scroll 20 rotates around the central axis of the bush 19. Never. That is,
The orbiting scroll 20 and the orbiting ring 22 revolve without rotating. The closed spaces S1 and So shown in FIG. 2 decrease in volume as the orbiting scroll 20 revolves, and the inner end portions 321, 34 of the spiral walls 32 and 34 of the scrolls 11 and 20.
341 converge. The final closed space So converges to zero volume.

The movable scroll substrate 33 has a discharge port 2
5 are formed. The discharge port 25 communicates with the final sealed space So. An accommodation hole 26 is formed in the back of the movable scroll substrate 33. The accommodation hole 26 is connected to the discharge port 25. A disc-shaped valve body 29 is movably accommodated in the accommodation hole 26. An annular mounting groove 262 is formed in the peripheral wall of the accommodation hole 26, and the circlip 30 is fitted and fixed in the mounting groove 262. As shown in FIG. 3, a plurality of gas passages 261 are formed in the peripheral wall of the housing hole 26 by cutting. The valve body 29 movably accommodated in the accommodation hole 26 is in contact with the step between the discharge port 25 and the accommodation hole 26, that is, the bottom portion 263 of the accommodation hole 26 and closes the discharge port 25 as shown by a solid line in FIG. It moves between a closed position and an open position in which the discharge port 25 is opened by contacting the circlip 30 as shown by a chain line in FIG.
The circlip 30 serves as an open position regulating means for regulating the open position of the valve body 29. The accommodation hole 26, the valve element 29, and the circlip 30 constitute a discharge opening / closing unit. The discharge opening / closing means is in the surrounding area of the cylinder 332 when viewed in the axial direction of the rotating shaft 14.

The refrigerant gas compressed by the reduction in the volumes of the closed spaces S1 and So is discharged from the final closed space So to the space 35 in the cylinder 332 via the discharge port 25 and the gas passage 261. The space 35 is the needle bearing 2
The space 36 communicates with the space 36 outside the cylinder 332 through the gap of the motor housing 13 through the passage 37.
Communicates within. The refrigerant gas in the motor housing 13 passes through the passage 141 in the rotating shaft 14 and the motor housing 1.
It exits to the external refrigerant circuit 38 via the outlet 131 on the end wall of No.3.

In the first embodiment, the following effects can be obtained. (1-1) The accommodation hole 26 for accommodating the valve element 29 and the discharge port 25 are formed in the movable scroll substrate 33, and the gas passage from the final sealed space So to the discharge opening / closing means is substantially the discharge port 25. Only. The amount of the refrigerant gas to be recompressed is only the volume of the discharge port 25, and the gas passage of only the discharge port 25 formed in the movable scroll substrate 33 is short. Therefore, the volume of gas to be recompressed is smaller than in the past, the volume efficiency is increased, and the compression efficiency is improved.

(1-2) The circlip 30 fitted into the side wall of the housing hole 26 prevents the valve body 29 from coming off from the inside of the housing hole 26 and regulates the open position of the valve body 29. The circlip 30 is reduced in diameter against the elasticity so that the mounting groove 262 is formed.
The fitting operation is easy. Valve 2
The circlip 30 that determines the opening position of the ninth 9 is optimal as an opening position regulating means.

(1-3) The final sealed space So is at the center of the movable scroll board 33, and the discharge port 25 communicating with the final sealed space So is in the surrounding area of the cylinder 332.
In order to converge the final sealed space So to zero volume, it is desirable to arrange the discharge port 25 near the central axis of the eccentric shaft 17. The surrounding area of the cylinder 332 including the central axis of the eccentric shaft 17 is optimal as the arrangement position of the discharge port 25, and therefore, the surrounding area of the cylinder 332 is optimal as the arrangement position of the discharge opening / closing means.

(1-4) The refrigerant gas discharged from the discharge port 25 into the space 35 passes through the inside of the motor housing 13. The temperature of the discharged refrigerant gas is determined by the stator 27 and the rotor 2.
The refrigerant gas, which is lower than the temperature of the motor 8 and passes through the motor housing 13, cools the motor. The gas passage from the discharge port 25 to the motor housing 13 in the present embodiment has a simpler structure than the gas passage from the discharge port to the motor housing in a compressor having a discharge port on the fixed scroll substrate 31 side.

Next, a second embodiment shown in FIG. 4 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. A plurality of gas passage holes 391 are provided through the valve body 39. The gas passage hole 391 is arranged at a position separated from the discharge port 25 when viewed in the axial direction of the rotating shaft 14. When the valve body 39 is in contact with the bottom 263 of the accommodation hole 26, the gas passage hole 391 is closed.

In this embodiment, the same effects as in the first embodiment can be obtained. Further, the configuration in which the gas passage hole 391 is formed in the valve body 39 contributes to the weight reduction of the valve body 39,
The response of the valve body 39 is improved.

Next, a third embodiment shown in FIG. 5 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. At the tip of the eccentric shaft 17, a position regulating projection 171 is integrally formed. The diameter of the position regulating projection 171 is the accommodation hole 2
6 is smaller than the diameter, and the tip end surface 172 of the position regulating projection 171 enters the accommodation hole 26. Valve body 29
Moves between a closed position in contact with the bottom 263 of the housing hole 26 as shown by a solid line and an open position in contact with the distal end surface 172 of the position regulating projection 171 as shown by a chain line.

A position regulating projection 171 serving as an open position regulating means.
Can be easily formed on the eccentric shaft 17, and the mounting groove 262 and the circlip 30 in the first embodiment become unnecessary. Next, a fourth embodiment shown in FIGS. 6 to 9 will be described.
The same components as those in the first embodiment are denoted by the same reference numerals.

As shown in FIG. 6, the center housing 1
A fixed scroll 40 is joined to 2, and a front cover 41 is joined to the fixed scroll 40.
A movable scroll 42 is housed between the front cover 41 and the fixed scroll 40. Movable scroll 4
A tube 421 is protrudingly provided on the second movable spiral wall 43 side.
The bush 19 is inserted into the cylinder 421, and the needle bearing 21 is interposed between the bush 19 and the cylinder 421. That is, the movable scroll 42 is
The bush 19 is rotatably supported by a bush 19 via a needle bearing 21 as bearing means. The fixed scroll substrate 44 and the fixed scroll wall 45 of the fixed scroll 40 and the movable scroll substrate 46 and the movable scroll wall 43 of the movable scroll 42 form closed spaces So, S1, S2 as shown in FIGS. The movable scroll 42 revolves with the rotation of the eccentric shaft 17.

A plurality of (four in the present embodiment) rotation preventing pins 4 are provided on the back surface of the movable scroll substrate 46.
7 is fixed. A pressure receiving plate 48 is interposed between the front cover 41 and the movable scroll substrate 46. As shown in FIG. 9, the same number of rotation prevention holes 49 as the rotation prevention pins 47 are arranged in the pressure receiving plate 48 and the front cover 41 in the circumferential direction. The rotation preventing holes 49 are disposed at equal angular positions, and the ends of the rotation preventing pins 47 are inserted into the rotation preventing holes 49.

With the rotation of the eccentric shaft 17 formed integrally with the rotary shaft 14, the orbiting scroll 42 revolves, and refrigerant gas introduced from the entrance 401 of the peripheral wall of the fixed scroll 40 flows from the peripheral sides of the scrolls 40 and 42. The liquid flows between the fixed scroll substrate 44 and the movable scroll substrate 46. With the revolution of the movable scroll 42, the peripheral surface of the rotation preventing pin 47 slides along the peripheral surface of the rotation preventing hole 49. Diameter D of anti-rotation hole 49, diameter d of anti-rotation pin 47 and bush 1
A relationship of D = d + 2r is set between the orbital radii r of nine. This relationship defines the orbital radius of the orbiting scroll 42 as r.

The orbiting scroll 42 tends to rotate around the central axis of the bush 19, that is, the central axis of the eccentric shaft 17. However, the 3 fixed to the movable scroll substrate 46
Since more than one rotation prevention pin 47 is in contact with the inner peripheral surface of the rotation prevention hole 49, the orbiting scroll 42 does not rotate around the central axis of the bush 19. That is, the orbiting scroll 42 revolves without rotating.

The movable scroll substrate 46 has a discharge port 5
0 is formed. As shown in FIG. 7, the end of the movable scroll substrate 46 in the surrounding area of the cylinder 421 is provided with the receiving hole 2.
6. Discharge opening / closing means including a valve body 29 and a circlip 30 is provided. The accommodation hole 26 is connected to the discharge port 50. The closed spaces S2, S1 and So decrease in volume with the revolution of the movable scroll 42 while the scrolls 4
It converges between the inner end portions of the spiral walls 45, 43 of 0,42. The compressed refrigerant gas is discharged from the final sealed space to the space 35 via the discharge port 50.

A discharge passage 51 is formed in the rotating shaft 14. The discharge passage 51 extends from the distal end surface of the eccentric shaft 17 to the middle of the rotary shaft 14 and opens to the peripheral surface of the rotary shaft 14. The refrigerant gas discharged into the space 35 flows into the motor housing 13 via the discharge passage 51.

The eccentric shaft 17, the bush 19 and the needle bearing 21 constitute a revolving mechanism for revolving the orbiting scroll 42. The revolving mechanism and the rotating shaft 14 are disposed on the movable scroll wall 43 side with respect to the movable scroll substrate 46, and the fixed scroll substrate 44 is disposed at a position surrounding the cylinder 421 and the eccentric shaft 17. In the conventional configuration in which the revolving mechanism and the rotating shaft are arranged on the back side of the movable scroll board, the fixed scroll 40 is connected to the front cover 4 shown in FIG.
1, and a space for providing a discharge chamber is required further on the front side (left side in FIG. 6) of the front cover 41 of the compressor of the present embodiment. Therefore, the configuration in which the revolving mechanism and the rotating shaft 14 are arranged on the movable scroll wall 43 side with respect to the movable scroll substrate 46 enables the length of the scroll compressor in the axial direction of the rotating shaft 14 to be reduced.

The structure in which the discharge opening / closing means is provided on the movable scroll substrate 46 of the scroll compressor having such advantages brings about a further reduction in the length of the scroll compressor and an improvement in compression efficiency.

[0040]

As described above in detail, according to the present invention, a discharge port is provided in a movable scroll substrate, and a valve body which is moved by a gas flow between an open position for opening the discharge port and a closed position for closing the discharge port. Since the discharge opening / closing means provided with the movable scroll substrate is provided on the movable scroll substrate, there is an excellent effect that the compression efficiency when the discharge port is provided in the movable scroll substrate can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an entire compressor according to a first embodiment.

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an essential part cross-sectional view showing a second embodiment.

FIG. 5 is a sectional side view of a main part showing a third embodiment.

FIG. 6 is a side sectional view of the entire compressor showing a fourth embodiment.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view taken along line DD of FIG. 6;

FIG. 9 is a sectional view taken along line EE of FIG. 6;

[Explanation of symbols]

11 ... fixed scroll. 14 ... Rotary axis. 17: Eccentric shaft.
19 ... Bush. 20: movable scroll. 21 ... Needle bearings serving as bearing means. 25 ... Discharge port. 2
6 ... Accommodation hole constituting discharge opening / closing means. 27. A stator constituting the motor. 28 ... A rotor constituting a motor. 2
9, 39: Valve body constituting discharge opening / closing means. Reference numeral 30: a circlip serving as an open position regulating means constituting the discharge opening / closing means.
31 ... fixed scroll substrate. 32: Fixed spiral wall. 33 ...
Movable scroll board. 34 ... Movable spiral wall.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasushi Watanabe 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Toshiro Fujii 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Shares F term in Toyota Industries Corporation (reference) 3H029 AA02 AA15 AA21 AB03 BB43 CC05 CC07 CC15 CC17 CC25 3H039 AA02 AA12 BB28 CC02 CC08 CC11 CC29 CC30 CC32

Claims (5)

[Claims] A fixed scroll having a fixed scroll wall formed on a fixed scroll substrate and a movable scroll having a movable scroll wall formed on a movable scroll substrate are opposed to each other. In a scroll compressor in which a closed space whose volume is reduced based on the revolution of the movable scroll is formed between the movable scroll wall and the fixed spiral wall, a discharge port is provided in the movable scroll substrate, and the discharge port is opened. A discharge structure in a scroll compressor in which a discharge opening / closing means including a valve element moved by a gas flow between a position and a closed position for closing the discharge port is provided on the movable scroll substrate. 2. The storage device according to claim 1, wherein the discharge opening / closing means includes a receiving hole recessed in the rear surface of the movable scroll substrate so as to be continuous with the discharge port, the valve element received in the receiving hole, 2. An open position restricting means for restricting an opening position of the valve body by preventing the valve body from being detached from the valve body.
2. The discharge structure in the scroll compressor according to 1. 3. The discharge structure according to claim 2, wherein said open position restricting means is a circlip fitted into a side wall of said housing hole. 4. A revolving mechanism for revolving the movable scroll by transmitting a rotating force of a rotating shaft, wherein the revolving mechanism includes an eccentric shaft that rotates integrally with the rotating shaft, and an eccentric shaft and the movable scroll. Bearing means interposed between them, the bearing means being housed in a cylinder projecting from the back of the movable scroll substrate, the discharge opening / closing means being viewed in the axial direction of the rotary shaft. The discharge structure of the scroll-type compressor according to any one of claims 1 to 3, wherein the discharge structure is located within a surrounding area of the cylinder. 5. A discharge structure in a scroll compressor according to claim 1, further comprising a motor for driving said rotary shaft.