| Apparatus and method for aligning scroll compressor -> Monitor Keywords |
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Apparatus and method for aligning scroll compressorRelated Patent Categories: Pumps, MiscellaneousApparatus and method for aligning scroll compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060159578, Apparatus and method for aligning scroll compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to an apparatus for aligning a scroll compressor and, more particularly, to a technique capable of performing alignment in a short time without reducing aligning accuracy. BACKGROUND ART [0002] In a scroll compressor, scroll wraps formed in spiral shape on end plates of a fixed scroll and an orbiting scroll are brought into mesh with each other thereby to internally form a hermetically closed working chamber and the orbiting scroll is caused to perform an orbital motion, whereby a crescent-shaped space formed between the scroll wraps moves from the periphery to the center while reducing its volume, and a cooling medium is compressed by utilizing this phenomenon. [0003] Incidentally, in the above-described scroll compressor, the positional relationship of the fixed scroll and the orbiting scroll in a meshed condition, i.e., an assembly accuracy of a wrap clearance between the scroll wrap of the fixed scroll and the scroll wrap of the orbiting scroll or the like has a great effect on the compression performance and durability of a cooling medium. [0004] Therefore, it is necessary to align the fixed scroll and the orbiting scroll in an optimum position (alignment). Usually, in the aligning work of a scroll compressor, a dedicated aligning apparatus is often used. An example of this aligning apparatus is described in Patent Document 1 (the Japanese Patent Application Publication No. 2002-70763), for example. [0005] The aligning apparatus of the scroll compressor of Patent Document 1 is provided with fixed scroll moving means which moves a fixed scroll in the X-Y direction, .theta. revolving means which revolves a main frame in a .theta. direction, a driving section which revolves and drives an orbiting scroll via a driving shaft, and a displacement sensor which measures an X-Y displacement of the fixed scroll. [0006] First, while the orbiting scroll is being revolved by the driving section via the driving shaft, the main frame is revolved by the .theta. rotating means through a prescribed angle of .theta..degree., the displacement is read by use of the displacement sensor, and positioning of a relative revolution direction (.theta. revolution compensation) of the fixed scroll and orbiting scroll is performed. After that, the fixed scroll is forcedly moved in the X-Y direction by use of the fixed scroll moving means, variations in displacement are measured by use of the displacement sensor, and a minimum displacement value of the fixed scroll in the X-Y direction is determined (translation compensation), whereby the determination of the relative position (alignment) of the fixed scroll and the orbiting scroll is performed. [0007] However, in conventional aligning apparatus, the measurement of displacements in the directions of the X axis and Y axis is performed in each of the steps of .theta. rotation compensation and translation compensation in order to ensure high aligning accuracy, thereby requiring time to calculate a position for positioning. For this reason, production efficiency is low and this poses a problem in mass production. SUMMARY OF THE INVENTION [0008] Therefore, the present invention has been made to solve the above-described problem and has as its object the provision of an apparatus and a method for aligning a scroll compressor which can perform both .theta. revolution compensation and translation compensation on the basis of a moving displacement obtained by one measurement operation. [0009] To achieve the above object, the present invention provides an apparatus for aligning a scroll compressor, which has a compression section which is internally formed a hermetically closed working chamber by bringing scroll wraps of a fixed scroll and an orbiting scroll into mesh with each other, a main frame which supports the compression section, and a crank shaft which is connected to the orbiting scroll at a top end thereof, and performs positioning of the scroll wraps of the scroll compressor including a driving shaft held by the main frame while revolving the orbiting scroll via the driving shaft. This aligning apparatus comprises: X-Y moving means which is restricted in revolutions in a .theta. direction around a Z axis and supports the main frame or the fixed scroll so as to be movable in directions of an X axis and a Y axis; .theta. revolution compensation means which is restricted in movements in the directions of the X axis and the Y axis and supports the orbiting scroll or the fixed scroll via the main frame so as to be revolvable in the .theta. direction around the Z axis; orbiting scroll driving means which is connected to the driving shaft and drives the orbiting scroll; X-Y displacement measuring means which detects a moving displacement of the fixed scroll or the main frame in the directions of the X axis and the Y axis, which result from an orbital motion of the orbiting scroll; and control means which controls at least the X-Y moving means, the .theta. revolution compensation means, the orbiting scroll driving means and the X-Y displacement measuring means. In this aligning apparatus, the control means measures a moving displacement of the fixed scroll or the main frame, which results from the revolutions of the driving shaft, by use of the X-Y displacement measuring means by revolving and driving the driving shaft by use of the orbiting scroll driving means and by revolving the orbiting scroll or the fixed scroll in increments of a prescribed angle of .theta..degree. by use of the .theta. revolution compensation means each time the driving shaft performs a prescribed revolution, performs revolution compensation from obtained measured values by controlling the .theta. revolution compensation means so that the moving displacement of the fixed scroll or the main frame becomes a minimum, and performs translation compensation by determining an optimum position of the fixed scroll or the main frame from the measured values on the basis of displacement components in the directions of the X axis and the Y axis and by moving the fixed scroll or the main frame to the optimum position. [0010] As a result of this, both the alignment of the orbiting scroll and the fixed scroll in a relative revolution direction (.theta. revolution compensation) and the alignment in the directions of the X axis and the Y axis (translation compensation) can be adjusted at a time on the basis of a moving displacement measured during .theta. revolution compensation. [0011] Also, the control means performs arithmetic processing as stated in Formula 1, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position, [Formula 1] ( X C , Y C ) = { ( X max + X min ) 2 , ( Y max + Y min ) 2 } Formula .times. .times. 1 where a maximum point and a minimum point of a locus of the fixed scroll or the main frame in the direction of the X axis which are obtained when the driving shaft performs one revolution are denoted respectively by Xmax and Xmin, and a maximum point and a minimum point of the locus in the direction of the Y axis are denoted respectively by Ymax and Ymin. [0012] As a result of this, the center position for positioning (Xc, Yc) can be calculated as the center position of a maximum displacement value and a minimum displacement value in each of the directions of the X axis and the Y axis. [0013] Furthermore, the control means performs arithmetic processing as stated in Formula 2, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position, [Formula 2] ( X c , Y c ) = { i = 1 n .times. X i n , i = 1 n .times. Y n } Formula .times. .times. 2 where the number of all samplings of a locus of the fixed scroll or the main frame in the directions of the X axis and Y axis which are obtained when the driving shaft performs one revolution is denoted by n. [0014] As a result of this, the center of coordinate points of all sampling number n is averaged by integral calculation and this center is regarded as the optimum position (Xc, Yc) of the fixed scroll (or the main frame). Therefore, even when exceptional data by sampling errors is included, more stable positioning can be performed because leveling is performed by integration. [0015] Furthermore, the control means performs arithmetic processing as stated in Formula 3, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position, [Formula 3] ( X c , Y c ) = { X C1 + X C2 2 , Y C1 + Y C2 2 } Formula .times. .times. 3 where an optimum compensation angle of the orbiting scroll or the fixed scroll is denoted by .theta.c, a maximum displacement difference when the revolution angle of the orbiting scroll or the fixed scroll is .theta.1 is denoted by GAP1, the center of the locus in the directions of the X axis and the Y axis at this time is denoted by (X.sub.c1, Y.sub.c1), a maximum displacement difference when the revolution angle is .theta.2 is denoted by GAP2, with the optimum compensation angle .theta.c being intermediate between .theta.1 and .theta.2, the center of the locus in the directions of the X axis and the Y axis at this time is denoted by (X.sub.c2, Y.sub.c2), and the relationship GAP1 .English Pound. GAP2 holds in the maximum displacement difference. [0016] As a result of this, when a minimum point of the fixed scroll (the orbiting scroll) is an optimum compensation angle .theta.c, an optimum position (Xc, Yc) of the fixed scroll 1 is found from the center of a locus of revolution angles .theta.1, .theta.2, which provide almost the same displacement difference on a quadratic curve which appears symmetrically. Therefore, stable positioning can be performed. [0017] As a more preferable mode, it is preferred that abnormality detection means which is connected to the driving shaft and detects an abnormality in the orbiting scroll driving means which drives the orbiting scroll be further provided. [0018] As a result of this, it is possible to prevent an abnormal load from being applied to a work during aligning work and the work from being broken and it is also possible to positively prevent the aligning apparatus itself from being broken. [0019] A method for aligning the scroll compressor is also included in the present invention. That is, the present invention provides a method for aligning a scroll compressor, which uses a compression section which is internally formed a hermetically closed working chamber by bringing scroll wraps of a fixed scroll and an orbiting scroll into mesh with each other, a main frame which supports the compression section, and a crank shaft which is connected to the orbiting scroll at a top end thereof, and performs positioning of the scroll wraps of the scroll compressor including a driving shaft held by the main frame while revolving the orbiting scroll via the driving shaft. This method uses: X-Y moving means which is restricted in revolutions in a .theta. direction around a Z axis and supports the main frame or the fixed scroll so as to be movable in directions of an X axis and a Y axis; .theta. revolution compensation means which is restricted in movements in the directions of the X axis and the Y axis and supports the orbiting scroll or the fixed scroll via the main frame so as to be revolvable in the .theta. direction around the Z axis; orbiting scroll driving means which is connected to the driving shaft and drives the orbiting scroll; X-Y displacement measuring means which detects a moving displacement of the fixed scroll or the main frame in the directions of the X axis and the Y axis, which result from an orbital motion of the orbiting scroll; and control means which controls at least the X-Y moving means, the .theta. revolution compensation means, the orbiting scroll driving means and the X-Y displacement measuring means. And this method comprises: a displacement measuring step of measuring a moving displacement of the fixed scroll or the main frame, which results from the revolutions of the driving shaft, by use of the X-Y displacement measuring means by revolving and driving the driving shaft by use of the orbiting scroll driving means and by revolving the orbiting scroll or the fixed scroll in increments of a prescribed angle of .theta..degree. by use of the .theta. revolution compensation means each time the driving shaft performs a prescribed revolution, a revolution compensation step of performing revolution compensation from obtained measured values by controlling the .theta. revolution compensation means so that the moving displacement of the fixed scroll or the main frame becomes a minimum and a translation compensation step of performing translation compensation by determining an optimum position of the fixed scroll or the main frame from the measured values on the basis of displacement components in the directions of the X axis and the Y axis and by moving the fixed scroll or the main frame to the optimum position. [0020] As a result of this, it is possible to perform both the relative alignment (.theta. revolution compensation) of the orbiting scroll and the fixed scroll and the alignment in the directions of the X axis and the Y axis by measuring only one moving displacement. BRIEF DESCRIPTION OF THE DRAWINGS Continue reading about Apparatus and method for aligning scroll compressor... Full patent description for Apparatus and method for aligning scroll compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Apparatus and method for aligning scroll compressor patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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