JPS611894A - Method of producing multiple stage annular blower - Google Patents

Abstract

PURPOSE:To enable series or parallel coupling type of high blast amount multiple stage blowers to be rearranged and changed to each other if necessary during and after production by utilizing divided casings in common for annular blower sections on the respective stages. CONSTITUTION:When a series coupling type multiple stage annular blower is rearranged and changed to a parallel type multiple stage annular blower the partition wall between a front stage 2a and rear stage 2b is arranged on an axial straight line, so that respective openings 14, 15 of intermediate divided casings 12, 13 are disposed in face to face combination with each other. In this case since the openings 14, 15 are defined to have same radius and interval, they coincide with each other. Silencers 3a, 3b are arranged repectively outside an intake port 9 on the front stage 2a and a discharge port 10 of the rear stage 2b in the outside divided casing 12 on the respective stages 2a, 2b. Thus, gas introduced from the intake port 9 is diverged to the front stage 2a and rear stage 2b through the intake opening 14. Air is sent to the discharge port 10 from the front stage 2a through the rear stage 2b and a discharge opening 15 so that sent blast amount reaches increasingly the sum of that in the respective stages 2a, 2b.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a multi-stage annular blower, and in particular to a series-coupled high-pressure multi-stage annular blower, or The present invention relates to an annular blower which is advantageous in terms of production, in which parallel-coupled high air volume multi-stage annular blowers can be manufactured and rearranged according to needs after manufacturing.

[Prior art and its points of interest]

The structure and operation of the annular blower that is the subject of this invention are as follows:
The explanation will be made using the one-stage annular blower shown in the structural diagram 1ζ of FIGS. 1 to 3. The annular blower is broadly divided into a driving electric motor 1, a blower section 2) and a silencer 3, which are combined and connected to each other. The blower section 2 includes an impeller 4 and casings 5 and 6 surrounding the impeller 4. The impeller 4 has a central boss supported by the electric motor rotating shaft 7, and a large number of blades 4a are arranged on the circumference of the impeller 4, slightly tilted forward with respect to the rotation direction B, and at the base of the blades 4a, A cross-sectional convex portion 4b is formed that bulges toward the center. Casing 5, 6
As a result, side grooves 8 as air passages are formed along both sides of the blades 4a. The suction port 9 and the discharge port 10 are arranged to open close to each other on the side gutter 8, and especially at the castle t between the suction port 9 and the discharge port 10', high pressure air from the discharge port lo side flows to the suction port 9 side. In order to prevent backflow, the blade 4a and the casing 5.
A partition structure is formed in which a partition wall 11 is formed with almost no gap between the partition walls 6 and 6. Similarly, the side surface of the impeller 4 is made so that there is no gap between it and the casing.

Such an annular blower can obtain a high blowing pressure with a relatively small amount of air, and is used for a variety of purposes. In particular, when a higher blowing pressure is required due to the load requirements, a serial type multi-stage annular blower in which a plurality of stages of the annular blower sections 2 are connected in series is used. - When a high airflow rate is required, - parallel type multi-stage annular fans connected in parallel are used. In the multi-stage annular blower as described above, it is structurally difficult to connect a connecting air pipe separate from the casing between the casings of each stage as a means of connecting the air passages of the annular blower sections of each stage. Becomes multiple chicks.

Also, since the impeller is built into each stage, two casings are required for each stage, but in order to avoid this, the casings of adjacent stages are integrated, and the intermediate casing and the casings for both ends are combined. The variety will increase. In particular, a distinction must be made between intermediate housings by series and parallel connections. Increasing the variety of casings not only causes problems in terms of parts management, but also requires mold placement when manufacturing casings from aluminum die-casting for annular fans that require high precision such as side grooves and where improved cooling is desired. There was also the problem of falling prices.

[Object of the Invention] ' In view of the above-mentioned problems, the present invention aims to simplify the structure while supporting series or parallel multi-stage annular blowers by using as few types of casings as possible.

[Key points of the invention]

In order to achieve the above-mentioned objectives, the present invention essentially divides the casing of each stage into two, and creates substantially one identical divided casing for the left and right sides of each stage and throughout each stage in series or parallel. Correspondingly, the aim is to solve the difference in the connection of back-to-back split housings in series or parallel connections by means of communication-closable means. That is, the structure of the invention is as follows.

The casing of the annular blower section of each stage is composed of split casings that are perpendicular to the rotation axis and divided into two at the center plane of the impeller, and are arranged in combination on both sides of the impeller.
The number of split casings corresponding to twice the number of split casings are formed from substantially the same mold 2'17, and are provided with an opening as a suction port or a discharge port on one side with a partition wall between them, and an opening as a suction port or a discharge port on the other side. Alternatively, a continuous communication closable means that can be communicated or closed to the outside as a suction port is provided, and a flange portion having the same radius and shape from the center is provided on the communication closable means and the opening, and the divided casings are placed back to back. They can be joined when butted against each other, and when connecting each stage in parallel, the partition walls of each stage are arranged in a straight line in the axial direction, and the communication and closing means of adjacent intermediate split casings of each stage are connected. The communication and closing means of the split casing for both ends is closed, and when the stages are connected in series, the discharge side of each stage is arranged to communicate with the suction side of the succeeding stage, and the A method for manufacturing a multi-stage annular blower, characterized in that a means for communicating and closing between a middle split casing and both end split casings is closed.

[Embodiments of the invention]

Embodiments of the invention will be described with reference to the drawings. First, FIGS. 4 to 7 show an embodiment of a two-stage serial multi-film blower, in which two front and rear annular blower sections 2a are disposed on the rotating shaft 7 of an electric motor 1 as a drive machine.

2b are installed with their casings abutting each other in the axial direction. The casing in each stage 2a, 2b has a rotating shaft 7
The impeller 4 is perpendicular to
It consists of split casings 12 and 13 arranged and assembled on both sides of the casing. The divided casings 12 as divided casings for both ends located on the outside of the plane in the structure of the annular blower parts 2a and 2b are provided with silencers 3a and 3b on the suction side and the discharge side, respectively, which open into the side grooves 8 and serve as outer piping. Only one of the suction port 9 and the discharge port 10, which communicate with each other, is provided as an opening. The split casings 12 of 2a and the split casings 12 of 2b have exactly the same shape but are used in opposite directions. In other words, if the opening is used as 2a, it will become the suction port, and 2
If used as b, it becomes a discharge port. On the other hand, if we explain the split casing 13 as an intermediate split casing that faces each other between the annular blower parts 2a and 2b of each stage from the 2a side, as shown in FIG. in,
As shown in FIG. 3, an opening 14 on the suction side opening into the side groove 8 and an opening 15 on the discharge side having the same shape as the opening 15 are bored at intervals t' in the partition wall 11 (not shown), and each Flange portions 14a and 15a of the same shape are formed protrudingly surrounding the openings 14 and 15. Further, a flange portion 1 as a closing lid body having no opening is adjacent to the flange portion 15a of the opening portion 15 and separated by a distance t′ on the radius r.
6 is formed in the same shape as the flange portions 14a and 15a. 8 is used as the divided casing 13 of the annular blower section 2a, but as the divided casing 13 of the annular blower section 2b, the same shape as that in FIG. 8 is used back to back with the direction opposite. . In this case, as shown in Fig. 8, the openings 14 and 15 are
It is clear that the function as a discharge port and the function as a suction port are opposite to those of the former stage 2a (arrow B in FIG. 8 is also reversed).

In this way, the split casings 13 facing each other back to back between the stages 2a and 2b have a structure in which the perforated openings 14 and 15 are provided with the same radius r and the same spacing l' as shown in FIG.
The openings 14 and 15 are arranged with an interval t' between them, and the discharge opening 15 of the divided casing 13 in the front stage 2a is connected to the suction opening 14 of the divided casing 13 in the rear stage 2b. , its flange portion 15a
By matching 148 with 148, the air passages of each stage 2a and 2b are connected in series, and the air pressure boosted at the front stage 2a is further boosted at the rear stage 2b, resulting in a high air blow pressure. Note that due to this arrangement, the opening on the suction side of the front stage 2a and the opening on the discharge side of the rear stage 2b, which are not used, are positioned opposite to the closing flange portions 16 of the rear stage 2b and the front stage 2a, respectively, and are closed. This situation is shown in FIGS. 5 to 7.

Now, in the above, the relationship between the divided casing 12 for both ends and the divided casing 13 for intermediate and the communication/closable means will be explained. It has already been described that the split casing 12 for both ends is the same but the direction is reversed so that it is shared by the 2a side and the zb side, and the same is true for the middle split casing 13. The split casing 12 for both ends and the split casing 13 for the middle are designated by reference numerals 14 (15) and 14a in FIG.
(15a) The other shapes except for the part indicated by [Suction side when used on the 2a side, that is, discharge side when used on the 2b side] are completely the same (especially the code 15 (14)
and 15a (the part indicated by 14a)). Moreover, the different parts are also shown in Fig. 7, as shown in Figure 7.
2 is also provided with a flange part (number not shown) having the same shape as the one described above, and only the extension part of the side groove 8 exists, so this extension part of this flange part is drilled by machining etc. The split casing 12 for both ends is made into the split casing 13 for the middle. Therefore, the suction port 9 when used on the 2a side of the split casing 12 for both ends, the discharge port when used on the 2b side, and the openings on the 2a side and 2b side that are interconnected back to back in the split casing 13 for the middle. 1 is an opening as a suction port or a discharge port shown in the gist of the present invention.On the other hand, the flange portion of the split casing 12 for both ends which has not yet been machined and the split casing 1 for the middle
The openings closed by the flange portions 16 as back-to-back closing lids of No. 3 are communication and closable means shown in the gist of the present invention. In addition, as a means for closing an unused opening, in addition to forming the closing flange 16 integrally with the intermediate divided casing 13 as described above, a closing lid is prepared as an independent closing member and is attached at the time of assembly to close it. It is also possible to have a structure that allows Furthermore, it is also possible to use the intermediate split casing on both end sides and close off the openings that are not used with Dokzu's closing member.

Next, FIGS. 9 to 11 show an embodiment in which the multistage annular fans connected in series in the previous embodiment are coupled in parallel. When manufacturing this parallel multi-stage annular blower, the partition walls of the front stage 2a and rear stage 2b are arranged on a straight line in the axial direction, and the openings 14 and 15 of the intermediate split casing are aligned and butted against each other. Combine. In this case openings 14, 15
are determined to have the same radius r and the same interval t', so they match. In the outer divided casing 12 of each stage 2a, 2b, silencers 3a, 3b are piped outwardly to the suction port 9 of the front stage 2a and the discharge port 10 of the rear stage 2b, respectively, as in the previous embodiment. Therefore, the gas introduced from the suction port 9 is divided into the rear stage 2b via the front stage 2a and the suction opening 14.

Since the air from the front stage 2a is sent to the discharge port 10 through the rear stage 2b and the discharge opening 15, the air volume sent out is in phase with each stage 2a and 2b, and a high air volume is obtained.

Note that in this parallel type, the seven closing flange portions 16 do not close the opening of the other party and are not used.

Although each of the above embodiments has been described with respect to a two-stage multi-stage annular blower, a structure having three or more stages is similarly configured. In addition, multi-stage annular fans manufactured in series can be rearranged and operated in parallel depending on load requirements.

As described above, according to the present invention, there is no need to prepare casing parts of different shapes for the series type and the parallel type, and by using the parts of each divided casing that are gun-shaped in the same shape, each membrane is Either assemble the blower by shifting its relative position, or
By matching and assembling them, it is possible to manufacture serial or parallel type multi-stage annular blowers, which is extremely advantageous for back-end production, such as parts inventory management. In addition, even after manufacturing, it is possible to switch between parallel and series types, allowing one annular blower to be used in two different ways. Moreover, since the openings of the casings in each stage are located opposite each other, the casings can be connected directly to each other without going through a separate connecting pipe, which is advantageous for manufacturing. We can provide a multi-stage annular blower.

[Brief explanation of drawings]

Figure 1 is a perspective view of a one-stage annular blower, Figure 2 is a vertical side view of Figure 1, Figure 3 is a 1m-II sectional view of Figure 2, and Figure 4 is a 1m-II cross-sectional view of Figure 2.
The figure is an end view of the serial type embodiment of the present invention, and FIGS. 5, 6, and 7 are V-V and VI-V in FIG. 4, respectively.
1, ■--■ sectional view, FIG. 8 is an outer side view of the divided casing shown in FIG. 4 and opposing between each stage on the opposite side, FIG. 9 is an end view of the parallel type embodiment, FIG. 1O and FIG. 11 are cross-sectional views taken along line xx and line xt-xi in FIG. 9, respectively. DESCRIPTION OF SYMBOLS 1... Drive electric motor, 2a, 2b... Each stage layered blower part, 4... Impeller, 4a... Vane, 7... Rotating shaft, 8... Side gutter, 9.10.・・Opening, 12.13
...split casing, ni? f ℃n31 years old 2ri! J' ” 16 Figure 3 Ryosai 8 Figure Sai 91121 Urisai 10 Garden

Claims (1)

[Scope of Claims] 1) An impeller having a large number of blades arranged upright on its outer peripheral surface, and a suction port that surrounds the impeller and forms a side groove for the blades, and that opens into the side groove by sandwiching a partition wall. An annular blower section consisting of a casing having a discharge port is connected and assembled by axially abutting each other on a rotating shaft in multiple stages, and at this time, the air passages of the blower sections of each stage are connected in series or parallel to each other. In a method for manufacturing a series or parallel multi-stage annular blower, the casing of each stage annular blower is divided into two halves at right angles to the rotation axis and at the center of the impeller, and the casings are arranged on both sides of the impeller. Consisting of a split casing, with two stages.
The number of split casings corresponding to twice the number of split casings are formed from substantially the same mold, and are provided with an opening as a suction port or a discharge port on one side, sandwiching the partition wall portion, and a discharge port or suction port on the other side. When the divided casings are butted back to back by providing a means for communicating or closing the communication with the outside and providing a flange portion having the same radius and shape from the center as the means for communicating and closing the opening. When connecting each stage in parallel, the partition walls of each stage are arranged in a straight line in the axial direction, and the communication and closing means of the adjacent intermediate split casings of each stage are connected, and the The means for connecting and closing the divided casings is closed, and when the stages are connected in series, the discharge side of each stage is arranged to communicate with the suction side of the subsequent stage, and the adjacent intermediate divided casings of each stage are A method for manufacturing a multi-stage annular blower, characterized in that the means for communicating and closing between the casing and the split casing for both ends is closed. 2) In the method for manufacturing a multi-stage annular blower according to claim 1, the communicating and closing means of the divided casing as a component is communicated with the outside in advance, and the communicating and closing means is made to have the same shape as the flange portion of the communicating and closing means. By providing the split casing with a flange portion serving as a closing box body without an opening at a position on the radius and sandwiching the opening at the same distance l' as the communication/closable means, the split casing can be connected in series. A multi-stage annular blower characterized in that the communication closable means of adjacent intermediate divided casings are closed, and the communication closable means of both end divided casings are closed by independent closing members when connected in series or in parallel. production method. 3) In the method for manufacturing a multi-stage annular blower as set forth in claim 1, the communicating and closable means has a side groove extension and a flange, and the side groove of the communicating and closable means to be communicated is bored. A method of manufacturing a multi-stage annular blower characterized by providing a multi-stage annular blower.