JPS6331676B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an arcuate spiral member in a spiral fluid machine such as a compressor.

Conventionally, arc-shaped spiral members manufactured by this type of method include those shown in FIGS. 1A and 1B. In the figure, reference numeral 1 denotes a stationary spiral member (hereinafter referred to as a fixed scroll), which includes a circular end plate 1a, an arcuate spiral side plate 1b provided on this end plate, and a compression member provided at the center of the end plate 1a. It has a fluid discharge hole 1c. Reference numeral 2 denotes an orbiting spiral member (hereinafter referred to as an oscillating scroll), which includes a circular end plate 2a, an arcuate spiral side plate 2b provided on the end plate, and a pin portion 2c protruding from the back surface of the end plate 2a. It has 3
is a rotating shaft having an eccentric hole, and is connected to the pin portion 2c. Note that FIGS. 2A and 2B are a plan view and a sectional view showing only the swinging scroll 2.

Next, the operation will be explained. Now, as an example, a case where a spiral fluid machine acts as a compressor will be described. In FIG. 1, the compressible fluid sucked from the outer periphery of the scroll is surrounded by a crescent-shaped pocket formed by fitting the fixed scroll 1 and the orbiting scroll 2. The oscillating scroll 2 has a protruding pin 2c, a rotating shaft 3 having an eccentric hole that fits into the pin 2c, and a rotary shaft 3 that prevents the oscillating scroll 2 from rotating and keeps the fixed scroll 1 and the oscillating scroll 2 in a fixed angular relationship. The volume of the crescent-shaped pocket becomes smaller as it moves toward the center, and the compressible fluid in the pocket is compressed by performing a non-rotating revolution movement by a coupling means (not shown) for maintaining the crescent shape. The fluid compressed to a high pressure as it moves toward the center is discharged through a discharge hole 1c formed in the center of the fixed scroll 1.
When the fluid moving here is an incompressible fluid, the spiral fluid machine acts as a fluid pump, and when the oscillating scroll 2 rotates in the opposite direction, the spiral fluid machine functions as an expansion engine. do. In this case, it is desirable to have high machining accuracy in the radial and axial directions of the scrolls to achieve good sealing and prevent fluid leakage.

The spiral member used in the spiral fluid machine is composed of spiral side plates and end plates such as an Archimedean spiral or a circular arc. To explain the arc spiral member with reference to Fig. 2, the spiral side plate has an arc with a center angle of 180° whose radius is the diameter of the minimum arc, that is, half the length of the pitch P in Fig. Central angle whose radius is the length of the connected pitch P
An arc of 180° and a circular arc with a center angle of 180° whose radius is the length of 3/2 of the pitch P continuously connected to one end of the arc. The concentric semicircular arcs of 2P, 3/2P, 5/2P, ... and the concentric semicircular arcs of radius P, 2P, 3P, ... form a continuous arc spiral.

Conventionally, such an arcuate spiral member has been manufactured by integrally machining it by cutting with an end mill, and then wrapping it to obtain precision.

Conventional scroll members were manufactured using the method described above, which required special machine tools such as numerically controlled machine tools and dedicated machines. Furthermore, when integrally machining with an end mill, increasing the feed speed of the end mill in order to shorten the machining time has disadvantages such as limits to the surface finish and dimensional accuracy of the scroll's arcuate spiral side plate. It took a long time to ensure dimensional accuracy.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the arc-shaped spiral member is formed by combining the first and second members divided into two, and the arc-shaped spiral member is formed by combining the first and second members divided into two parts. , the center of the second arc-shaped side plate is aligned with the center of the disc, and the center of the arc-shaped side plate on the first disc is shifted by a predetermined pitch from the center of the disc. It is an object of the present invention to provide a method for manufacturing an arcuate spiral member in a spiral fluid machine, which allows the arcuate spiral member with high precision to be easily manufactured by cutting using a lathe or the like by positioning the member.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 3, 4 is a concentric semicircular arc side plate 4 with radius P, 2P, 3P... on the semicircular end plate 4a.
A split scroll 5 as a first member formed by forming a part 5 has a radius of 1/2 on the other semicircular end plate 5a.
2P, 3/2P, 5/2P, ... is a divided scroll as a second member formed by forming concentric semicircular arc-shaped side plates 5b, and the center of the semicircular arc-shaped side plates 5b of the divided scroll 5 is Although it coincides with the center of the end plate 5a, the semicircular arc-shaped side plate 4b of the divided scroll 4 is offset by 1/2P from the center of the end plate 4a.

Next, a method for manufacturing the arcuate spiral member according to the present invention will be explained.

First, a first circular plate (consisting of two end plates 4a) in which a plurality of arc-shaped side plates A (consisting of two semicircular arc-shaped side plates 4b) having different radii are formed concentrically is inserted into two along the diameter. A second circular plate is divided into divided scrolls 4, and a plurality of arcuate side plates B (consisting of two semicircular arc-shaped side plates 5b) having a radius different from that of the arcuate side plate A are concentrically formed ( (consisting of two end plates 5a) is divided into two divided scrolls 5 along the diameter. At this time, that is, when forming each arcuate side plate A, B, the center of the arcuate side plate B is aligned with the center of the second disc, and the center of the arcuate side plate A is relative to the center of the first disc. Shift the pitch by P/2. Next, this split scroll 5
and the divided scroll 4 are connected to both semicircular arc-shaped side plates 4b and 5.
An oscillating scroll (arc spiral member) is formed by combining them so that b is continuous.

In this way, an oscillating scroll (or fixed scroll) can be manufactured.

Such split scrolls 4 and 5 are made by machining the material into concentric circles using a lathe and then cutting it in half, or by cutting the material in half in advance and fixing the cut points together by some method and machining it into concentric circles. It is manufactured by removing it from. Then, by assembling the two divided scrolls 4 and 5 manufactured in this way together on a circular back-up plate 6 with mounting bolts 7, for example, as shown in FIG. 4, an oscillating scroll can be attached. . Of course, fixed scrolls can also be attached in a similar manner.

FIG. 5 shows an example in which the divided scroll described above is applied to a compressor as a compression element. 4 in the figure,
Reference numeral 5 designates a split scroll used for the swinging scroll, which is fixed to the backup plate 6 using mounting bolts 7. 8 and 9 are split scrolls used as fixed scrolls, and are fixed to the casing 15 using mounting bolts 7. 3 is a rotating shaft for eccentrically moving the oscillating scroll; 12 is a balancer for suppressing vibrations in the rotating system; 10 is a coupling means for maintaining the oscillating scroll and the fixed scroll in a fixed angular relationship; 11 is a bearing; 13 is a shaft sealing part, 1
4 is a drive pulley, 16 is a compressed fluid suction pipe, 1
7 is a compressed fluid discharge pipe, and 18 is lubricating oil.

In the above embodiment, the divided scrolls were attached and fixed to the backup plate 6 and the casing 15 by the mounting bolts 7, but the divided scrolls may be connected to each other with adhesive or pins, or by welding. You can also connect them together.

As described above, the present invention forms at least one of the two circular arc spiral members of a spiral fluid machine by combining the first and second members divided into two, and In forming the arc-shaped side plate, the center of the arc-shaped side plate on the second disc is aligned with the center of the disc, and the center of the arc-shaped side plate on the first disc is aligned with the center of the disc at a predetermined distance. Since the positions are shifted by the pitch, there is no need for spiral machining when manufacturing spiral members, and it is possible to manufacture spiral members only by circular machining. It can be finished with. Therefore, since it becomes possible to process with a general-purpose machine such as a lathe, there is an effect that a product with high precision can be easily obtained without requiring special processing equipment.

[Brief explanation of the drawing]

1A and 1B are a cross-sectional plan view and a cross-sectional side view showing a circular arc spiral member of a conventional spiral fluid machine,
FIG. 2A is a plan view showing the swinging scroll in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line B--B. Figures 3 and 4 show one embodiment of the present invention. Figure 3 is a plan view showing a divided scroll, Figure 4 A is a plan view showing the assembled divided scroll, and Figure B is a plan view of the divided scroll. FIG. 5 is a sectional view taken along the line B-B, and a sectional side view showing an example in which the present invention is applied to a compressor. In the figure, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a rotating shaft, 4 and 5 are divided scrolls, 6 is a backup plate, and 7 is a mounting bolt. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. By fitting two arcuate spiral members of equal pitch into each other and rotating one of the arcuate spiral members, there is a gap between the two arcuate spiral members. A first method of manufacturing an arcuate spiral member in a spiral fluid machine that moves a space to be formed and moves fluid in the space, wherein a plurality of arcuate side plates having different radii are formed concentrically.
is divided into two first members along the diameter, and a second disc in which a plurality of arcuate side plates having a radius different from the radius of the arcuate side plates are formed concentrically is divided into two first members along the diameter. After dividing the second member into two second members according to , the second member and the first member are combined so that both semicircular arc-shaped side plates are continuous, so that at least one of the two arcuate spiral members forming an arcuate spiral member, and aligning the center of the arcuate side plate on the second disc with the center of the disc when forming the arcuate side plates on each of the two discs;
A method for manufacturing an arcuate spiral member in a spiral fluid machine, comprising positioning the center of an arcuate side plate on a first disc at a position shifted by a predetermined pitch with respect to the center of the disc. 2 The semicircular arc-shaped side plate of the first member forms a concentric semicircular arc having a radius of (2n-1)P/2 [n is a positive integer], where the diameter of the minimum arc is P,
Claim 1: The semi-circular arc-shaped side plate of the second member forms a concentric semi-circular arc of radius nP with the center point of the arc shifted by P/2 with respect to the semi-circular arc-shaped side plate of the first member. A method for manufacturing an arcuate spiral member in a spiral fluid machine as described in 2.