KR20180007814A - Method for manufacturing scroll case - Google Patents

Abstract

The present invention discloses a method of manufacturing a scroll case. The present invention provides a method of manufacturing a scroll case having an inner space in which a rotating machine is installed and a volute disposed outside the inner space, wherein the method includes: manufacturing an external wooden pattern from a mock-up model; manufacturing a plurality of core wooden patterns of different sizes of a first volute portion corresponding to a volute of a scroll case; installing a first core wooden pattern of the plurality of core wooden patterns inside the external wooden pattern; and casting a first scroll case by inserting molten metal between the external wooden pattern and the first core wooden pattern.

Description

[0001] METHOD FOR MANUFACTURING SCROLL CASE [0002]

The present invention relates to a manufacturing method, and more particularly, to a method of manufacturing a scroll case.

BACKGROUND ART Compressors, pumps, blowers, and the like for compressing fluids and the like generally have a structure of a rotating machine having a rotating body therein. Generally, such a rotating machine has an impeller and a scroll casing. Among them, the impeller is configured to transmit rotational kinetic energy to the fluid to increase the pressure of the fluid. To this end, the impeller is provided with a plurality of blades for transferring energy to the fluid, .

The scroll case is complicated in shape and is difficult to manufacture by machining, and is mainly manufactured by a casting method. Casting is a way to produce wooden products with the same shape as wooden products by making wooden products. It is economical when mass production of one product as a single wooden product. So it is not economically suitable.

Parameters such as flow rate and flow rate are set according to the purpose of use of the rotating machine, and the shape and size of the rotating machine can be designed by parameters. If the flow rate or flow rate is different, the size of the scroll case must be changed and a wooden form is required for each scroll case.

In particular, when a scroll case is manufactured by a casting method, an outer wooden body and a core wooden body are required for each scroll case, which limits the production and management of the wooden body.

In addition, a scrolling case of various sizes is required for the performance test of the rotating machine. Since the scroll case for casting is expensive and time consuming to manufacture, the economical efficiency is very low.

A lot of efforts have been made to improve the efficiency of the casting process. Korean Patent Registration No. 10-1104646 discloses a technique of adjusting the size of a mold frame corresponding to the size of a wooden mold.

Korean Patent Registration No. 10-1104646 (published Jan. 14, 2012)

Embodiments of the present invention provide a method of manufacturing a scroll case with improved manufacturing efficiency.

According to an aspect of the present invention, there is provided a method of manufacturing a scroll case having an inner space in which a frame and a rotating machine are installed and a volute disposed outside the inner space, the method comprising the steps of: The method comprising the steps of: preparing a plurality of hollow bodies of different sizes of the first bolt portion corresponding to the bolts of the case; installing a first hollow body of the plurality of hollow bodies in the outer wooden body; And casting the first scroll case by inserting molten metal between the first and second hollows.

In addition, the step of fabricating the plurality of hollow bodies may include setting a limit of the size of the first volute part along the outer diameter of the volute of the first scroll case.

Further, the method may further include the step of installing the second heavy wooden among the plurality of middle wooden types inside the outer wooden, and the step of casting the second scroll case by inserting molten metal between the outer wooden and the second heavy wooden And the size of the first inner diameter of the volute of the first scroll case may be different from the size of the second inner diameter of the volute of the second scroll case.

A method of manufacturing a scroll case according to an exemplary embodiment of the present invention includes the steps of manufacturing one outer wooden model using one mock-up model and manufacturing a plurality of middle wooden types having different sizes of the bolt portion to manufacture scroll cases of various sizes .

The method of manufacturing a scroll case according to an embodiment of the present invention can manufacture a scroll case having a different size of a volute or a collector by making the external wooden molds common and different sizes of the wooden molds, Do.

1 is a perspective view showing a rotating machine equipped with a scroll case manufactured according to an embodiment of the present invention.
Fig. 2 is a partial cross-sectional view taken along line II-II of the scroll case of Fig. 1;
Fig. 3 is a sectional view showing a wooden mold for manufacturing the scroll case of Fig. 1. Fig.
4 is a flowchart illustrating a method of manufacturing a scroll case according to an embodiment of the present invention.
FIG. 5A is a view showing one of the plurality of middle tree types shown in FIG. 3. FIG.
FIG. 5B is a view showing another one of the plurality of middle tree types shown in FIG. 3. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the following embodiments, when a part of a film, an area, a component or the like is on or on another part, not only the case where the part is directly on the other part but also another film, area, And the like.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

1 is a perspective view showing a rotating machine 100 equipped with a scroll case 120 manufactured according to an embodiment of the present invention.

Referring to FIG. 1, a rotating machine 100 is a centrifugal compressor for compressing a fluid, and includes a large impeller 110 and a scroll case 120.

The rotary machine according to the present embodiment is a centrifugal compressor, but the present invention is not limited thereto. That is, the rotating machine according to the present invention is applicable to a device capable of changing the pressure and speed of the fluid by rotating the rotating body. For example, the rotating machine according to the present invention may be a pump, a blower, or the like.

The fluid to be compressed by the rotary machine 100 according to the present embodiment may be various fluids such as air, gas, water vapor, and liquid.

The impeller 110 includes a hub 111 and a blade 112 installed on the hub 111. The hub 111 is fixed to a rotary shaft (not shown) so that when the rotary shaft rotates, do.

A plurality of blades 112 are installed on the hub 111. The blades 112 function to guide the movement of the fluid and transmit the rotational kinetic energy of the impeller 110 to the fluid.

The scroll case 120 is generally referred to as a structure or an assembly in which the pressure increases as the fluid passing through the impeller 110 moves. The scroll case 120 includes an inlet 121, a diffuser 122, 123 and a collector section 124. [

The inlet 121 is formed in a central portion of the rotary machine 100 and is an inlet through which the fluid to be compressed flows.

The diffuser portion 122 is provided with a diffuser vane 122b for guiding the movement of the fluid to the bottom surface of the diffuser portion 122 as a place for reducing the speed of the fluid passing through the impeller 110 and increasing the pressure.

Although the diffuser portion 122 according to the present embodiment includes the diffuser vane 122b, the present invention is not limited thereto. That is, the diffuser portion 122 according to the present invention may not include the diffuser vane 122b.

The volute 123 is installed at the outer periphery of the diffuser portion 122, at which the fluid discharged from the impeller 110 passes after passing through the diffuser portion 122.

It is common that the volute 123 is formed so as to have a shape in which its flow cross-sectional area increases from its starting portion to its end portion, such that the speed of the fluid is reduced and the pressure is increased.

The collector section 124 is installed at one end of the volute 123 and the compressed fluid that has passed through the inside of the volute 123 is discharged to the outside through the collector section 124.

FIG. 2 is a partial cross-sectional view taken along II-II of the scroll case 120 of FIG. 1, FIG. 3 is a cross-sectional view showing a tree form of the scroll case 120 of FIG. 1, Fig. 3 is a flowchart showing a method of manufacturing the scroll case 120 according to the embodiment.

2 to 4, the outer case of the scroll case 120 may be shared by the outer case, and the size of the inner case may be different, so that the bolt 123 having different inner diameters may be manufactured.

2, the outer diameter of the bolt 123 is constant at Do, but the outer diameter of the bolt 123 may be selected to be Da, Db or Dc depending on the type of the core. That is, it is possible to manufacture a scroll case having different inner diameters of the bolts by using the single wooden body 10 and the central wooden molds 20a, 20b, and 20c having different sizes of the volute portions corresponding to the bolsters.

3, when the diameter of the portion corresponding to the bolt of the outer wooden mold 10 is set to a constant value of Do and the scroll case is manufactured by selecting the first central wooden mold 20a, A scroll case with a diameter of Db can be manufactured. When the scroll case is manufactured by selecting the second middle wooden mold 20b, a scroll case with a diameter of Db can be manufactured, and the third middle wooden mold 20c can be selected , A scroll case having a diameter of Dc of the volute can be manufactured.

 The method for manufacturing the scroll case 120 may include a step of manufacturing a mock-up model (not shown) and an outer wooden mold 10 (S10), a step of manufacturing a plurality of hollow wooden molds of different sizes S20), a step S30 of selecting a first middle tree among a plurality of middle tree types, a step S30 of setting an outer tree type, and a step S40 casting a scroll case.

In addition, it may be determined whether or not it is necessary to produce scroll cases of different volute sizes (S50), and if necessary, step S60 may be performed to select the second mid-tree among the plurality of mid- .

The step of fabricating the mock-up model and the outer structure 10 (S10) first produces a mock-up model to be manufactured. At this time, since the mock-up model is for making the outer wooden mold 10 to be shared, the outer diameter of the portion corresponding to the volute is constant at Do. Since the scroll case according to the manufacturing method of the present invention has a constant outer diameter of the volute, it is possible to manufacture a scroll case having a plurality of inner diameter sizes by manufacturing only one mock-up model. That is, only one outer wooden mold 10 can be manufactured to manufacture the scroll case 120 of various sizes.

In the step S20 of manufacturing a plurality of hollows having different sizes of the volute portion, a plurality of hollows having different shapes of the bolt portion and the discharge portion may be manufactured taking into account the shape and size of the inner flow path of the scroll case.

FIG. 5A is a view showing one of the plurality of middle tree types 20a of FIG. 3, and FIG. 5B is a view showing another one of the plurality of middle tree types 20c of FIG. However, the design of the core wood type is not limited to the following embodiments, and may be variously formed according to the shape, use purpose, and capacity of the rotating machine.

5a, the first central wooden mold 20a includes a central portion 21 forming a space for installing a rotating machine, a first bolt portion 22a extending along the outer side of the central portion 21, And a first discharge portion 23a formed at one end of the lute portion 22a. The first volute portion 22a and the first discharge portion 23a correspond to the volute 123 and the collector portion 124 of the scroll case, respectively.

The first heavy body 20a may be formed so that its diameter increases from the first bolt portion 22a to the first discharge portion 23a. The diameter of the first volute portion 22a is Va and the discharge diameter in the first discharge portion 23a can be increased to Ra.

Referring to FIG. 5B, the center part 21 of the third middle piece 20c is the same as the first middle piece 20a. The size of the center portion 21 is the same because the size of the volute 123 or the collector portion 124 is different and the space for installing the rotating machine is constant.

The third heavy body 20c may be formed so that the difference between the diameters of the third bolt portion 22c and the third discharge portion 23c is not large. Further, the diameter of the third volute portion 22c may be larger than Va by Vc, and the diameter of the third discharge portion 23c may be formed to be smaller than Ra by Rc.

The plurality of the weft tweezers 20a, 20b, and 20c may be set to a size limit of the volute portion along the outer diameter Do of the volute 123 of the scroll case. The thickness of the volute 123 of the scroll case 120 has a limit thickness depending on the flow rate, flow rate, etc. of the rotating machine. When the external wooden mold 10 is shared, the outer diameter of the bolt 123 of the scroll case 120 is constant, so the upper limit of the inner diameter must be set. Therefore, the upper limit of the inner diameter of the bolus 123 of the scroll case 120 is set, and the size of the volute portion can be set to correspond to the upper limit of the inner diameters of the plurality of hollows.

2 to 4, a step S30 of selecting a first mid-tree 20a among the plurality of middle tree types and installing the same on the outer tree is performed in accordance with the designer's selection, The middle tree 20b or the third middle tree 20c can be selected and installed in the inner space of the outer wooden body 10. [ Hereinafter, for convenience of explanation, the case in which the first heavy-duty wooden body 20a is selected will be mainly described.

 In the step of casting the scroll case S40, molten metal may be injected between the outer wooden 10 and the selected first hollow 20a to manufacture the first scroll case.

Then, it is determined whether or not the second scroll case having different volute sizes is required (S50). If necessary, the second heavy wood 20b among the plurality of heavy wood types can be selected and installed in the external wood 10 (S60). Thereafter, molten metal is injected between the outer wooden mold 10 and the second middle wooden mold 20b to manufacture a second roll case.

The scroll case manufactured using the first heavy-duty wooden body 20a has a thickness of the Do-Da and the scroll case manufactured using the second heavy-duty wooden body 20b has a thickness of the bolt of Do- Db, and the scroll case manufactured using the third heavy metal mold 20c may have a thickness of the volute of Do-Dc. That is, a scroll case having various sizes can be manufactured by using one outer wooden mold 10. Further, a scroll case having different thicknesses of volutes can be manufactured.

Traditionally, to create a scroll case, one outer and one middle wooden piece are required for each scroll case. In addition, in the conventional scroll case, the thickness of the volute is constant. Therefore, when the inner diameter of the volute is changed, that is, when the size of the wooden body is different, the size of the outer wooden body must be changed.

In detail, the scroll case is designed in such a way that the middle type wooden structure reflecting the size of the paid shape and the discharge portion is designed first, and the outer wooden structure is designed so as to have a constant thickness corresponding to the designed wooden structure. In the above method, since the outer shape of the scroll case is changed as the inner shape of the scroll case is changed, one central wooden body and an outer wooden body are required for each inner body.

Since outer wooden or middle wooden can not be used in common, when manufacturing scroll cases of different sizes, it is necessary to manufacture the outer wooden and the middle wooden, so that it is limited in terms of cost and difficult to manage.

The method for manufacturing the scroll case 120 according to an exemplary embodiment of the present invention includes the steps of manufacturing one outer wooden mold 10 using one mock-up model and forming a plurality of middle wooden molds 20a, 20b, 20c can be manufactured to produce scroll cases of various sizes.

The method of manufacturing the scroll case 120 according to an embodiment of the present invention includes the steps of sharing the external wooden mold 10 and making the sizes of the wooden molds 20a, 20b, and 20c different, The case can be manufactured.

The method of manufacturing the scroll case 120 according to the embodiment of the present invention can manufacture the scroll case by combining a plurality of the wooden molds 20a, 20b, and 20c on one outer wooden mold 10, It is inexpensive and easy to manage.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

10: outer wooden type 20a: first middle wooden type
20b: second heavy wood 20c: third heavy wood
100: rotating machine 110: impeller
120: scroll case 121: inlet
122: diffuser part 123: volute
124:

Claims (3)

A method of manufacturing a scroll case having an inner space in which a rotating machine is installed and a volute disposed outside the inner space,
Producing an outer wooden form from a mock up model;
Fabricating a plurality of polygonal wooden shapes having different sizes of the first volute portion corresponding to the volute of the scroll case;
Installing a first polyhedron of the plurality of polyhedrons inside the outer polyhedron; And
And casting a first scroll case by inserting molten metal between the outer wooden body and the first hollow body. The method according to claim 1,
Wherein the step of fabricating the plurality of hollow-
And setting a limit of the size of the first volute portion along the outer diameter of the volute of the first scroll case. The method according to claim 1,
Installing a second one of the plurality of middle wooden types inside the outer wooden form; And
And casting the second scroll case by inserting the molten metal between the outer wooden body and the second hollow body,
Wherein the size of the first inner diameter of the bolt of the first scroll case is different from the size of the second inner diameter of the bolt of the second scroll case.

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