JP2006242173A - Low pressure large capacity scroll fluid machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll fluid machinery structured so as to obtain a large gas capacity with a low pressure, without changing the total dimensions and the rotating speed of a scroll. <P>SOLUTION: An outside volume fluctuating chamber is formed by providing a spiral wrap connected to an inlet with its interval enlarged to obtain a low pressure compressed gas, and an inside volume fluctuating chamber connected to the inlet, in which the compression ratio is made practically identical to that in the outer volume chamber is provided between the outside volume fluctuating chamber and the center part of the end plate. As the end plate eccentrically rotates, the low pressure gas having practically identical pressures is made to discharge from the inside and outside volume fluctuating chambers. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll fluid machine capable of obtaining a large capacity at a relatively low pressure.

  In a scroll fluid machine including a scroll compressor and a scroll vacuum machine, the volume of the sealed space from the winding end side of the wrap at the outer peripheral part to the winding start side of the wrap in the vicinity of the center is sequentially reduced to suck from the outer peripheral part. The pressurized gas is pressurized and discharged from the vicinity of the center, or conversely, the air is sucked from the vicinity of the center and discharged from the outer periphery.

  Such a conventional general scroll fluid machine is, so to speak, for medium and high pressure, and can obtain a compressed gas having a considerably high pressure, and can perform an effective pressure reducing action.

  However, according to such a conventional scroll fluid machine, a large volume of compressed gas cannot be obtained at a low pressure of about 0.2 to 0.3 MPa, for example, in order to transport powder such as wheat flour. In order to obtain a large volume of compressed gas at such a low pressure, it is necessary to increase the wrap interval and reduce the number of turns.

  When the interval between the laps is increased, the radius of the orbiting scroll is naturally increased, and the outer diameter of the orbiting scroll is increased. For this reason, the orbiting scroll having increased mass must be largely orbited. Further, the load at the orbiting bearing portion of the orbiting scroll is increased, and accordingly, a bearing having a large load resistance is required, and the weight and size are increased, and the manufacturing cost is increased.

  In order to avoid such a problem, the wrap may be formed as close as possible to the center of the orbiting scroll so that the diameter of the orbiting scroll does not become as large as possible. As a result, the desired low-pressure compressed gas cannot be obtained.

  For this reason, conventionally, in the scroll compressor for low pressure, the orbiting wrap is removed in the vicinity of the center portion of the orbiting scroll, and the wrap having a large interval is provided only in the portion away from the center. However, with this arrangement, the center portion of the orbiting scroll does not function at all for output, and is inefficient and uneconomical.

  In the present invention, the interval between the wraps is the same as that for the conventional medium and high pressure, and a compressed gas having a low pressure equivalent to the compressed gas generated by the wraps in the outer peripheral portion is also provided in the vicinity of the central portion which has not been conventionally used. An object of the present invention is to provide a scroll fluid machine in which a low pressure and large air volume can be obtained without changing the overall dimensions and the rotation speed of the scroll by providing a wrap that can be generated.

According to the present invention, the above object is achieved by adopting the following configuration.
(1) An outer volume fluctuation chamber is formed by providing a spiral wrap that is connected to the air inlet and has a large interval to obtain a low-pressure compressed gas on the outer peripheral portion of the end plate, and this outer volume fluctuation. An inner volume fluctuation chamber is provided between the chamber and the central portion of the end plate, and an inner volume fluctuation chamber is provided with a compression ratio substantially the same as that of the outer volume fluctuation chamber. Accordingly, low-pressure gas having substantially the same pressure is discharged from the inner and outer volume fluctuation chambers.

(2) In the above item (1), an outer start volume change chamber communicating with the outer intake port at the outer end of the outer volume change chamber, and an outer end volume change chamber communicating with the air outlet at the inner end of the outer volume change chamber; The volume ratio of the inner start volume change chamber that communicates with the inner intake port at the outer end of the inner volume change chamber and the inner end volume change chamber that communicates with the inner vent at the inner end of the inner volume change chamber. To be substantially equal.

(3) In the above item (1) or (2), the air outlet of the outer volume fluctuation chamber is connected to the air inlet of the inner volume fluctuation chamber.

(4) In any of the above items (1) to (3), a scroll compressor is used.

(5) An inner volume fluctuation chamber is formed by providing a spiral wrap which is connected to the air inlet and has a large interval in order to obtain a low-pressure compressed gas at the center of the end plate. An inner volume fluctuation chamber that is connected to the air inlet and has a compression ratio substantially the same as that of the outer volume fluctuation chamber is provided between the outer peripheral portion of the end plate and the outer peripheral portion of the end plate. Accordingly, low-pressure gas having substantially the same pressure is discharged from the inner and outer volume fluctuation chambers.

(6) In the above item (5), an outer start volume change chamber that communicates with the outer air outlet at the outer end of the outer volume change chamber, and an outer terminal volume change chamber that communicates with the intake port at the inner end of the outer volume change chamber; The volume ratio of the inner start volume change chamber that communicates with the inner vent at the outer end of the inner volume change chamber and the inner end volume change chamber that communicates with the inner intake port at the inner end of the inner volume change chamber. To be substantially equal.

(7) In the above item (5) or (6), the air outlet of the inner volume fluctuation chamber is connected to the air inlet of the outer volume fluctuation chamber.

(8) In any one of the above items (5) to (7), a scroll decompressor is used.

  Invention according to claim 1:-Gases sucked into the inner and outer volume fluctuation chambers as the end plates are swung are simultaneously pressurized and discharged from the inner and outer volume fluctuation chambers at substantially the same pressure. Even if the overall dimensions are not increased, the total amount of the discharge pressure gas from the two volume fluctuation chambers is larger than that in the conventional case where the wrap is provided only on the outer peripheral portion.

  Invention of Claim 2: A large amount of compressed gas of substantially equal pressure is discharged from the outer and inner volume fluctuation chambers.

  Invention of Claim 3: Since the compressed gas discharged from the outer volume fluctuation chamber is recompressed in the inner volume fluctuation chamber, a somewhat high pressure compressed gas is obtained.

  Invention of Claim 4: A compressor with a large discharge pressure gas amount is obtained.

  The invention according to claim 5:-The gas sucked into the inner and outer volume variation chambers is simultaneously decompressed and discharged from the inner and outer volume variation chambers at substantially the same pressure as the end plate turns. Even if the overall dimensions are not increased, the total amount of gas discharged from both volume change chambers is larger than that of conventional wraps only on the outer periphery, and effective decompression is performed. .

  Invention of Claim 6: A large amount of gas of substantially equal pressure is discharged from the inner and outer volume fluctuation chambers, and effective pressure reduction is performed.

  Invention of Claim 7: The compressed gas suck | inhaled to the inner side volume fluctuation | variation chamber is pressure-reduced by an outer side volume fluctuation | variation chamber, and effective pressure reduction is performed.

  Invention of Claim 8:-A decompressor with a large decompression effect is obtained.

  FIG. 1 is a longitudinal side view showing an embodiment in which the present invention is applied to the present invention described in claims 1 to 4, that is, a scroll compressor as an example of a scroll fluid machine.

  In the present invention, as a feature thereof, the volume fluctuation chamber composed of a fixed lap and a swirl lap is divided into an outer peripheral side and an inner peripheral side.

  Since the basic structure of the scroll compressor shown in FIG. 1 is the same as that of the conventional one, it will be briefly described. In FIG. 1, the left side is the front and the right side is the rear.

  An outer intake port (3a) is located at a suitable position on the outer periphery of the fixed end plate (2) of the fixed scroll (1) at the front end, that is, the left end of FIG. 1, and an inner exhalation port (4b) is also located at the center. An outer air outlet (4a) and an inner air inlet (3b) are provided between them.

  A spiral fixed wrap (5) is erected on the rear surface of the fixed end plate (2). Similarly, on the front surface, loose, wave-shaped, uniform cooling fins (6) facing the horizontal direction are arranged at almost equal intervals. It is erected with.

  The orbiting scroll (7) arranged facing the rear side of the fixed scroll (1) has a spiral orbit on the front surface of the circular orbiting end plate (8), that is, the surface facing the fixed scroll (1). The wrap (9) is erected, and a plurality of wavy cooling fins (10) that are horizontally oriented and are erected at substantially equal intervals on the rear surface.

  A bearing plate (11) is superposed and secured to the rear surface of the orbiting scroll (7). A cylindrical boss (15) that pivotally supports the eccentric shaft portion (13) of the drive shaft (12) via the bearing (14) projects from the center portion of the rear surface of the bearing plate (11).

  For example, a known crankpin type anti-rotation mechanism (16) is incorporated at three locations on the outer peripheral portion of the rear surface of the bearing plate (11), and the orbiting scroll (7) is housed in a housing (17 ) With respect to the drive shaft (12).

  A cover plate (18) is brought into contact with the front surface of the fixed scroll (1) and is fastened and fixed by an appropriate fastening screw (19).

  The orbiting scroll (7) and the bearing plate (11) superposed on the rear surface are integrated by tightening with a tightening screw (20).

  The rear plate (21) of the fixed scroll (1) is superposed on the front surface of the housing (17), and both are fastened by bolts (22) and nuts (23).

  Fitting grooves (24) and (25) are formed on the front end surfaces of the fixed wrap (5) and the orbiting wrap (9), respectively, and the orbiting scrolls facing each other in the fitting grooves (24) and (25), respectively. The revolving end plate (8) of (7) and the seal member (S) that comes into sliding contact with the fixed end plate (4) of the fixed scroll (1) are fitted.

  As shown in FIGS. 2 and 3, which are longitudinal sectional views taken along line II-II in FIG. 1, the fixed wrap (5) includes an outer volume fluctuation chamber fixed wrap (5 a) connected to the outer intake port (3 a) and an inner side. The swirl wrap (9) is divided into an inner volume fluctuation chamber swirl wrap (9a) and an inner volume fluctuation chamber swirl wrap (9b). ).

  Therefore, the distance between the outer volume fluctuation chamber fixed wrap (5a) and the outer volume fluctuation chamber swirl wrap (9a) is increased, and the inner volume fluctuation chamber fixed wrap (5b) and the inner volume fluctuation chamber swirl wrap. The distance from (9b) is a little small.

  In addition, the volume ratio between the outer start volume change chamber (A) communicating with the outer intake port (3a) and the outer end volume change chamber (B) communicating with the outer exhalation port (4a), and the inner intake port (3b) The volume ratio of the inner start end volume fluctuation chamber (C) communicating with the inner end volume fluctuation chamber (D) communicating with the inner vent (4b) is substantially equal.

  Therefore, compressed gas having substantially equal pressure is generated in both the outer and inner volume fluctuation chambers, and a large amount of low-pressure compressed gas is obtained as compared with the conventional one in which the wrap at the center of the scroll is removed.

  FIG. 4 shows the present invention described in claims 5 to 8, that is, FIG. 2 in an embodiment in which the present invention is applied to a scroll decompressor (including a scroll vacuum machine) as an example of a scroll fluid machine. It is the same vertical side view.

  In FIG. 4, the inner air outlet (4b) in FIG. 2 is the inner air inlet (3b), the outer air outlet (4a) is the outer air inlet (3a), and the inner air inlet (3b) is the inner air outlet. (4b), and the outer intake port (3a) is also used as the outer exhalation port (4a). Other than that, there is no difference from the one shown in FIGS.

  As shown in FIG. 4, it is apparent that the gas sucked from the inner air inlet (3b) is discharged from the outer air outlet (4a) and decompressed.

It is a vertical side view which shows one Embodiment of this invention of Claims 1-4. It is the II-II line longitudinal cross-sectional view in FIG. In what is shown in FIG. 2, it is a figure which shows the state which the meshing state of the lap | wrap changed. It is a figure similar to FIG. 2 which shows embodiment of this invention of Claims 5-8.

Explanation of symbols

(1) Fixed scroll
(2) Fixed end plate
(3a) Outer air inlet
(3b) Inner air inlet
(4a) Outer vent
(4b) Inside nausea
(5) Fixed wrap
(5a) Outer volume fluctuation chamber fixed wrap
(5b) Inner volume fluctuation chamber fixed wrap
(6) Cooling fin
(7) Orbiting scroll
(8) Revolving end plate
(9) Turning lap
(9a) Swirling wrap for outer volume fluctuation chamber
(9b) Swivel wrap for inner volume fluctuation chamber
(10) Cooling fin
(11) Bearing plate
(12) Drive shaft
(13) Eccentric shaft
(14) Bearing
(15) Cylindrical boss
(16) Anti-rotation mechanism
(17) Housing
(18) Cover plate
(19) (20) Clamping screw
(21) Rear plate
(21a) Outward flange
(22) Bolt
(23) Nut
(24) (25) Fitting groove
(S) Seal member A Outer start volume change chamber B Outer end volume change chamber C Inner start volume change chamber D Inner end volume change chamber

Claims (8)

  An outer volume fluctuation chamber is formed on the outer peripheral portion of the end plate by providing a spiral wrap that is connected to the intake port and has a large interval to obtain a low-pressure compressed gas. An inner volume fluctuation chamber is provided between the end plate and the central portion of the end plate, and the compression ratio is substantially the same as that of the outer volume fluctuation chamber. A low-pressure, large-capacity scroll fluid machine characterized in that low-pressure gas having substantially the same pressure is discharged from the inside and outside volume fluctuation chambers.   The volume ratio between the outer start volume change chamber communicating with the outer intake port at the outer end of the outer volume change chamber and the outer end volume change chamber communicating with the air outlet at the inner end of the outer volume change chamber, The volume ratio between the inner start volume change chamber communicating with the inner intake port at the outer end and the inner end volume change chamber communicating with the inner exhaust port at the inner end of the inner volume change chamber is substantially equal. The low-pressure large-capacity scroll fluid machine according to claim 1.   The low-pressure, large-capacity scroll fluid machine according to claim 1 or 2, wherein an air outlet of the outer volume fluctuation chamber is connected to an air inlet of the inner volume fluctuation chamber.   The scroll fluid machine according to any one of claims 1 to 3, wherein the scroll fluid machine is a scroll compressor.   An inner volume fluctuation chamber is formed in the center portion of the end plate by providing a spiral wrap that is connected to the air inlet and has a large interval to obtain a low-pressure compressed gas. An inner volume fluctuation chamber is provided between the outer periphery of the plate and connected to the air inlet, and the compression ratio is substantially the same as that of the outer volume fluctuation chamber. A low-pressure, large-capacity scroll fluid machine characterized in that low-pressure gas having substantially the same pressure is discharged from the inside and outside volume fluctuation chambers.   The volume ratio of the outer start volume change chamber communicating with the outer air outlet at the outer end of the outer volume change chamber and the outer end volume change chamber communicating with the intake port at the inner end of the outer volume change chamber, The volume ratio of the inner starting volume changing chamber communicating with the inner air outlet at the outer end and the inner terminal volume changing chamber communicating with the inner inlet at the inner end of the inner volume changing chamber is substantially equal. The low-pressure large-capacity scroll fluid machine according to claim 5.   The low-pressure, large-capacity scroll fluid machine according to claim 5 or 6, wherein an air outlet of the inner volume fluctuation chamber is connected to an air inlet of the outer volume fluctuation chamber. The scroll fluid machine according to any one of claims 5 to 7, wherein the scroll fluid machine is a scroll decompressor.

Images