JP2007138877A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor wherein projecting parts in an undulation phenomenon generated in cutting by an end-mill on the wall surfaces of both laps of a fixed scroll and a swirl scroll are machined so that the projections in both laps do not overlap with one another, the man-hour for the cutting is reduced to make favorable on the cost aspect, leakage of a compressed gas is reduced, and compression efficiency can be improved. <P>SOLUTION: In the scroll compressor, both the laps 5b, 6b respectively of the fixed scroll 5 and the swirl scroll 6 have involute curve, and have each a thickness and height. The laps 5b, 6b erected from respective end plates are machined by cutting work with an end-mill. In the cutting work of the wall-surfaces of both the laps, projections 10a, 10b in undulations generated in the wall surfaces are constituted so that they do not overlap with one another. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor. More specifically, the present invention relates to a wrap for processing the convex portions of the undulation phenomenon generated during the end milling of the wall surfaces of both the fixed scroll and the orbiting scroll lap so that they do not overlap each other. It relates to a processing method.

When cutting a wall surface of a lap formed of an involute curve of a scroll compressor or a scroll of a scroll compressor, it is generally performed with an end mill tool 51 having a twist 50 as shown in FIGS. 6 (A) and 6 (B). is there. In this case, convex portions (protrusions) 54 and concave portions 55 are formed as shown in FIG. 7 due to the shape accuracy of the end mill 52 itself and the misalignment when the end mill 52 is attached to the spindle 53 (hereinafter referred to as swell). ).
In general, the end mill 52 used for the orbiting scroll 56 and the fixed scroll 57 is of the same shape. Therefore, when the undulation occurs, the convex portions of the wall surface of the involute can be located at the same position and overlap each other. Since the clearance 58 becomes large and the compressed gas leaks from the high pressure side to the low pressure side due to the pressure difference between the adjacent compression chambers, and the work amount of the leakage becomes useless energy, it is desirable to make it as small as possible in terms of performance. ing. (See FIG. 2). Therefore, it is desirable that the wrap wall surfaces of both scrolls have a similar shape as much as possible, but it is difficult to make the undulation zero due to the characteristics of the end mill tool 51, and the cost increases when sorted.

Further, as a conventional method of processing a scroll wrap for reducing the swell, a method as shown in FIGS. 8 and 9 is known (see, for example, Patent Document 1).
In this processing method, after cutting (for example, end milling) at least one of the sliding side surfaces and the end plate of the scroll-shaped lap rising from the end plate of the fixed scroll and the orbiting scroll, The side surface is ground by a grindstone and finished.

  The scroll compressor 6 ′ includes at least one of the side surfaces 1b1 ′, 2b2 ′ with which the scroll-like wraps 1b ′, 2b ′ slide, and at least one of the side surfaces 1b2 ′, 2b1 ′, for example, the fixed scroll 1 Side surfaces 1b1 'and 1b2' of 'lapping 1b' are used as grinding surfaces ground with a grindstone 9 'shown as one embodiment in FIG. 9A. A base material having a basic shape cast by a metal material such as iron or aluminum is cut and then ground by a grindstone 9 '.

  As described above, when at least one is finished by grinding, as shown in FIG. 9B, the side faces 1b1 ′ and 1b2 ′ of the wrap 1b ′ of the fixed scroll 1 ′ There is no undulation in the direction, even if it exists, as shown in FIG. 9 (b), as represented by the side surfaces 2b1 ′ and 2b2 ′ of the orbiting scroll 2 ′, as shown by the end mill without being ground. Very small compared to the swell. This is because there is no periodic unevenness in the grinding with an end mill, where there is no edge, and even if there is a slight inclination in the mounting accuracy, it is easy to adapt to the surface of the work piece. This is because the waviness in the longitudinal direction due to grinding cannot be performed. Further, since the surface obtained by grinding is fine, the laps 1b ′ and 2b ′ of the fixed scroll 1 ′ and the orbiting scroll 2 ′ are slid between the side surfaces 1b1 ′ and 2b2 ′ and between the side surfaces 1b2 ′ and 2b1 ′. If one of them is ground between each other, as shown in FIG. 9 (b), both laps 1b 'and 2b' leak compressed gas over the entire sliding portion in the rising direction. Since such a gap does not occur, such compressed gas leakage can be prevented, and the compression efficiency is improved.

  However, in the case of the above-described processing method, after cutting, grinding and finishing is performed with a grindstone 9 'or the like, which increases the number of processing steps and is disadvantageous in terms of cost. Therefore, a scroll compressor that has a small number of processing steps and is advantageous in terms of processing cost is desired.

JP 2001-32786 A

  In view of the above-described problems, the present invention reduces the number of processing steps by processing the convex portions of the undulation phenomenon that occurs during cutting by the end mill on the wall surfaces of both the fixed scroll and the orbiting scroll so that they do not overlap each other. An object of the present invention is to provide a scroll compressor that is small and advantageous in terms of cost, can reduce the leakage of compressed gas, and can improve the compression efficiency.

In order to solve the above-mentioned problems, the present invention is a scroll compression formed by cutting both a fixed scroll and an orbiting scroll using an end mill, which have a thickness and a height, and a wrap made of an involute curve stands upright from the end plate surface. In the machine
At the time of cutting the wall surfaces of both laps, the undulating convex portions generated on the wall surfaces are processed so as not to overlap each other.

  Further, the convex portions of both wraps are configured such that one is an even number, the other is an odd number, or both are an even number or an odd number.

  In addition, the same number of protrusions are provided on both wraps, and each protrusion is disposed between the other protrusions.

  Further, a plurality of convex portions of the other wrap are arranged between the convex portions of the one wrap.

  According to the present invention, the convex portions of the undulation phenomenon that occurs when the wall surfaces of both laps are machined, one is an even number, the other is an odd number, or both are an even number or an odd number. By arranging so that the convex portions of the two do not overlap each other and the wall surfaces of the laps of both scrolls mesh with each other, the number of processing steps is small, it is advantageous in terms of cost, and the leakage of compressed gas can be reduced. It can be set as the scroll compressor which can aim at the improvement of compression efficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.
FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention, FIG. 2 is an enlarged sectional view of an essential part of a compression section, and FIG. 3 is a top view showing a state where the wall surfaces of both scrolls of an involute curve are engaged.

1, 2 and 3, the inside of the sealed shell 1 is partitioned into an upper refrigerant discharge chamber 1 a and a lower motor chamber 1 b with the main frame 2 interposed therebetween, and a compression unit is provided in the refrigerant discharge chamber 1 a. 3 is accommodated, and the electric motor 4 is accommodated in the electric motor chamber 1b.
And the high pressure gas produced | generated by the said compression part 3 is sent out from the said refrigerant | coolant discharge chamber 1a through the said electric motor chamber 1b to the refrigerant circuit from the discharge pipe 20, and the scroll compressor is comprised.

  The compression unit 3 includes a fixed scroll 5 in which a spiral wrap 5b having an involute curve is erected on the inner surface of the end plate 5a, and a wrap 6b having the same involute curve on the inner surface of the fixed scroll 5 and the end plate 6a. The orbiting scroll 6 that forms a plurality of meshing compression chambers 7 and an orbiting bearing 6 c formed on the back surface of the orbiting scroll 6 are configured. Lubricating oil for inserting the turning shaft 8a at the tip into the orbiting bearing 6c, transmitting the rotational force of the electric motor 4 to the orbiting scroll 6, and supplying lubricating oil to each sliding portion of the compression portion 3. A scroll compressor is mainly constituted by the shaft 8 provided with the feed path 8b and the main frame 2 that supports the fixed scroll 5 while supporting the upper portion of the shaft 8.

  Cutting of the wall surface 5b1 of the wrap 5b of the fixed scroll 5 and the wall surface 6b1 of the wrap 6b of the orbiting scroll 6 made of the involute curve is the same as that of the conventional example using an end mill 9 having a twist 9a shown in FIG. By the way. In this case, due to the shape accuracy of the end mill 9 itself and the misalignment when the end mill 9 is attached to the spindle, as shown in FIG. A convex portion (protrusion portion) 10b on the scroll 6 side, a recess 11a on the fixed scroll 5 side, and a recess 11b on the orbiting scroll 6 side are formed.

  Therefore, the contact points of the cutting edge 9b of the end mill 9 for cutting the wall surfaces 5b1 and 6b1 of both the laps 5b and 6b, one is an even number and the other is an odd number, and the wall surfaces 5b1 and 5b1 of the wraps 5b and 6b are formed after processing. The convex portions 10 of the undulation phenomenon 6b1 are arranged so as not to overlap each other at the time of assembling the compression portion, and the wall surfaces 5b1, 6b1 of the wraps 5b, 6b of the scrolls 5, 6 are engaged with each other.

4A, two convex portions 10a are provided on the wall surface 5b1 of the wrap 5b of the fixed scroll 5 (even numbers), and three convex portions 10b are provided on the wall surface 6b1 of the wrap 6b of the orbiting scroll 6 (odd number). ) And arranged so that the convex portion 10a is in the center between the convex portions 10b and the convex portion 10b is in the middle between the convex portions 10a, and these are meshed with each other so that the convex portions 10a and 10b do not overlap. In the embodiment, this reduces the clearance 12 between the wall surfaces, reduces the leakage of compressed gas from the high pressure side to the low pressure side due to the pressure difference between the adjacent compression chambers 7, and improves the compression efficiency. be able to.
In addition, when one of the convex portions of the two wraps is an even number of 2 or more, the other is formed into an even minus one or an even plus one, and each convex portion is in the center between the other convex portions. It is set as the structure which arranges so that it may come.

  4B, two convex portions 10a are provided on the wall surface 5b1 of the wrap 5b of the fixed scroll 5 (even numbers), and two convex portions 10b are provided on the wall surface 6b1 of the wrap 6b of the orbiting scroll 6 (even numbers). ) And arranged so that the convex portion 10a is in the center between the convex portions 10b and the convex portion 10b is in the middle between the convex portions 10a, and these are meshed with each other so that the convex portions 10a and 10b do not overlap. In the embodiment, this reduces the clearance 12 between the wall surfaces, and as in the embodiment of FIG. 4A, leakage of compressed gas can be reduced, and compression efficiency can be improved.

  5A, six convex portions 10a (even number) are provided on the wall surface 5b1 of the wrap 5b of the fixed scroll 5, and two convex portions 10b are provided on the wall surface 6b1 of the wrap 6b of the orbiting scroll 6 (even number). In an embodiment in which two of the convex portions 10a are arranged so as to be between the convex portions 10b, and these are meshed with each other so that the convex portions 10a and 10b do not overlap with each other. As a result, the clearance 12 between the wall surfaces is reduced, and similarly to the embodiment of FIG. 4A, the leakage of the compressed gas can be reduced, and the compression efficiency can be improved.

  In FIG. 5B, five convex portions 10a (odd number) are provided on the wall surface 5b1 of the wrap 5b of the fixed scroll 5, and three convex portions 10b (odd number) are provided on the wall surface 6b1 of the wrap 6b of the orbiting scroll 6. 4), and these are meshed with each other so that the convex portions 10a and 10b do not overlap. As a result, the clearance 12 between the wall surfaces is reduced. Leakage can be reduced and compression efficiency can be improved.

  As described above, the contact points of the cutting edge 9b of the end mill 9 that cuts the wall surfaces 5b1 and 6b1 of both the laps 5b and 6b, one is an even number, the other is an odd number, or both are an even number or an odd number. The wall surfaces 5b1 and 6b1 of the wraps 5b and 6b formed after processing are arranged so that the convex portions 10a and 10b of the undulation phenomenon do not overlap each other when the compression unit is assembled, and the wall surfaces of the wraps 5b and 6b of the scrolls 5 and 6 By adopting a configuration in which 5b1 and 6b1 are engaged with each other, a scroll compressor is obtained that has a small number of processing steps, is advantageous in cost, can reduce the leakage of compressed gas, and can improve the compression efficiency.

It is a longitudinal cross-sectional view of the scroll compressor by this invention. It is a principal part expansion top view by this invention. It is a principal part expanded sectional view by this invention. It is a principal part enlarged top view which shows the 2nd Example of the discharge gas channel | path by this invention. It is a principal part enlarged top view which shows the 3rd Example of the discharge gas channel | path by this invention. It is a principal part enlarged top view which shows the 4th Example of the discharge gas channel | path by this invention. It is a principal part enlarged top view of the scroll compressor by a prior art example. It is a principal part expansion longitudinal cross-sectional view of the scroll compressor by a prior art example. It is a principal part enlarged top view of the scroll compressor which shows the other Example by a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing shell 2 Main frame 3 Compression part 4 Electric motor 5 Fixed scroll 5a End plate 5b Lapping 5c Discharge port 6 Orbiting scroll 6a End plate 6b Wrap 6c Orbiting bearing 8 Shaft 8a Orbiting shaft 8b Lubricating oil feed path 9 End mill 9a Wound 9a Cutting blade 9b 10b Convex part 11a, 11b Concave

Claims (4)

In a scroll compressor that has a thickness and a height, and a wrap made of an involute curve stands upright from the end plate surface, and both the scroll of the fixed scroll and the orbiting scroll are cut using an end mill,
A scroll compressor characterized in that, when cutting the wall surfaces of both laps, the wavy convex portions generated on the wall surfaces are processed so as not to overlap each other. The scroll compressor according to claim 1, wherein one of the convex portions of the wraps is an even number, the other is an odd number, or both are an even number or an odd number. The scroll compressor according to claim 1 or 2, wherein the number of convex portions of the two wraps is the same, and each convex portion is disposed between the other convex portions. The scroll compressor according to claim 1 or 2, wherein a plurality of convex portions of the other wrap are arranged between the convex portions of the one wrap.

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