GB2044351A

GB2044351A - Silencers for Fluid-machines

Info

Publication number: GB2044351A
Application number: GB8006113A
Authority: GB
Original assignee: Aerzener Maschinenfabrik GmbH
Current assignee: Aerzener Maschinenfabrik GmbH
Priority date: 1979-02-22
Filing date: 1980-02-22
Publication date: 1980-10-15
Also published as: DE2906991A1; EP0014743B1; IT1233004B; EP0014743A1; NL8001107A; DE2964313D1; IT8015134V0; SE8001346L; FR2449842B1; FR2449842A1; DE2906991C2; SE450593B; CH643036A5; BE881868A; GB2044351B; IT8012451A0

Description

1 GB 2 044 351 A 1

SPECIFICATION

Base Support for a Blower with Drive Motor The present invention relates to a base support for a blower with drive motor, comprising a.1 boxshaped base element, in the interior of which an absorption damper in the form of a perforated duct enveloped by a jacket of absorbent material is arranged, one end of which duct communicates, in use, with the pressure side of the blower and the other end with a pressure pipe connection. Such a support will hereinafter be referred to as "of this type".

Compared to conventional base support constructions, base supports of this type possess the advantage that in addition to their function as a machine frame for the blower and the drive motor, they simultaneously constitute the housing for the absorption damper, which is provided as a separate component in known constructions.

The overall height of base supports of this type is in fact lower than the overall height of conventional constructions. However, this advantage is offset against a relatively large volume configuration, a large material requirement and a large production outlay.

It is the aim of the present invention to provide a base support of this type in which the dimensions are reduced to the greatest possible extent without sacrificing the noise damping, and at the same time, the production costs are kept to a minimum.

According to the invention there is provided a base support for a blower with drive motor, comprising a base element formed of square- section tube, in the interior of which an absorption damper in the form of a perforated duct enveloped by a jacket of absorbent material is arranged, one end of which duct is adapted to communicate with the pressure side of the rotary piston blower and the other end with a pressure pipe connection, at least two horizontally projecting arms being attached to said tube so as to extend laterally, the square tube carrying mounting means for the drive motor and the perforated duct being constituted by a metal bar 110 grille.

By virtue of the features according to the invention, for the first time a base support has been produced which consists virtually exclusively of normally available standardised commercial 115 profiles or semi-finished pieces which can easily be prefabricated. The onerous welding together of sheet metal plates to form a boxshaped base element, as is necessary for base supports of the known type, can thus be eliminated. The use of a bar grille, which is preferably of steel, instead of a conventional perforated plate to form the duct enveloped by the jacket of absorbent material is furthermore technically more effective and easier.

According to a preferred embodiment, the mounting means is constituted by a slidable bracket resting upon the top side of the square section tube and located laterally by its lateral surfaces, which abut lateral side surfaces of the tube, the bracket being anchorable to the tube. By this means the arrangement of complicated clamping rails for the drive motor can be eliminated.

It is convenient to make the bracket of U- shaped construction, in which case the bridge of the U can be produced from a flat steel and the arms of the U from drop-forgings.

In order to attach the bracket to the tube it is convenient to provide either at least one strirrup passing under the tube or at least two clamps gripping the tube.

The bracket preferably consists of two sections which are mutually connected so as to be relatively adjustable by a screwthreaded rod. By this means an adaptation to different pediment sizes of drive motor is possible.

If a belt drive is used, it is convenient if the bracket is braced against the base support or against parts connected thereto or against the arm through at least one screw-threaded rod so as to be adjustable relative thereto. By this means a simple tensioning of the belt transmission is permitted, without the necessity for separate tensioning devices for this purpose.

In the case of a direct coupling of the drive motor to the rotary piston blower it is convenient if the mounting means comprises a sheet metal plate which is attached in the region of the top side of the squaresection tube. In this case, an additional economy of material is achieved if the sheet metal plate consists of two parts which are respectively arranged at the side of the tube in alignment with its surface and are braced against at least one arm.

It is advantageous for vibration damping that the arms carry vibrationdamping feet on the underside in the region of their free ends.

Two embodiments of the invention will now be described, by way of example, with reference to the accompanying drawing, wherein:

Fig. 1 shows a side elevation of a base support according to the invention, the arrangement of a rotary piston blower and of a drive motor including belt transmission being indicated by chain dotted lines, Fig. 2 shows a plan of the base support of Fig. 1, but without the rotary piston blower with drive motor, and Fig. 3 shows a cross-section through the base support according to the invention, of which the left-hand half shows a variant of embodiment according to Figs. 1 and 2 and the right-hand half shows a further variant of embodiment.

Figure 1 shows a base support constituted by a base element 1 which is formed by a customary commercial i.e. standardised, normally available, square tube, the end faces of which are closed by means of respective sheet metal plates 2 welded to the tube. To each of two vertically extending side surfaces of the square tube are welded horizontally projecting arms 3, 4 and 5, 6, each of which carries a vibration-da m ping foot 7 on the underside in the region of its free end.

A rotary piston blower G and a drive motor M 2 GB 2 044 351 A 2 for driving the blower, through a belt pulley transmission system, are mounted on top of the base element 1.

Because the belt pulleys of the rotary piston blower G and of the drive motor M, and the belt transmission, project laterally beyond the base element 1 on the one side and must be guarded by means of a cover, the arms 5 and 6 are constructed somewhat longer than the arms 3 and4,asshowninFigure2.

In order to secure the rotary piston blower G, a plurality of bores 8 are arranged on the top side of the base element, each of which carries a female screwthread to accommodate fixing bolts, and which surround an aperture 21 in the top side of the base element which communicates with the pressure side of the rotary piston blower G.

The drive motor M on the other hand rests upon a fixing device in the form of a slidable mounting bracket 9 resting upon the top side of the base element 1 and guided laterally by its lateral surfaces. The mounting bracket 9 comprises two sections 10 and 11 which are connected mutually through the intermediary of screwthreaded rods 12 and 13 and are adjustably connected through said screwthreaded rods to the arms 4 and 6. The two sections 10 and 11 of the bracket 9 each consists of a standardised commercial flat steel strip resting upon the top side of the base element 1, to the ends of which drop-forgings abutting against the lateral surfaces of the base element are firmly welded.

As is clear from Fig. 1 and from the left-hand half of Fig. 3, each section 10 or 11 of the bracket 9 is equipped with a stirrup 14 or 15 passing under the square tube, which permits a secure anchorage of the sections of the bracket 9 to the base element 1 in a simple manner.

According to a second embodiment which is illustrated in the right-hand half of Fig. 3, the sections 10 and 11 of the bracket 9 may also be anchored on the base element 1 by means of clamps 16, 17. For this purpose in the present embodiment an angle iron 17 is firmly welded to 105 the side of the square tube, which is engaged by the hook-like end of the clamp 16.

As Fig. 3 clearly shows, a steel bar grille 19 bent to form a rectangular duct 18 is provided in the interior of the square tube constituting the base element 1, and is enveloped by a jacket 20 of absorbent material. The one end of said duct 18 communicates with the pressure side of the rotary blower through the aperture 21 (Fig. 2), whereas the other end of the duct issues into a pressure pipe connection 22 which is arranged on the top side of the base element.

Claims

1. A base support for a blower with drive motor, comprising a base element formed of square-section tube, in the interior of which an absorption damper in the form of a perforated duct enveloped by a jacket of absorbent material is arranged, one end of which duct is adapted to communicate with the pressure side of the rotary piston blower and the other end with a pressure pipe connection, at least two horizontally projecting arms being attached to said tube so as to extend laterally, the square tube carrying mounting means for the drive motor and the perforated duct being constituted by a metal bar grille.

2. A base support according to claim 1, wherein the mounting means is constituted by a slidable bracket resting upon the top side of the square-section tube and located laterally by lateral surfaces which abut lateral side surfaces of the tube, the bracket being anchorable to the tube.

3. A base support according to claim 2, wherein the bracket is of U-shaped construction.

4. A base support according to claim 3, wherein the bridge of the bracket of U-shaped construction is constituted by a steel strip and the arms of the U are drop-forgings welded to the steel strip.

5. A base support according to claim 3 or 4, wherein the bracket is anchorable to the square tube through the intermediary of at least one stirrup passing thereunder.

6. A base support according to claim-3 or 4, wherein the bracket is anchorable to the square tube through the intermediary of clamps gripping the latter.

7. A base support according to claim 2, wherein the bracket is constituted by two sections which are mutually connected so as to be relatively adjustable by at least one screwthreaded rod.

8. A base support according to claim 2, wherein the bracket is braced against the base support or against parts connected thereto through at least one screwthreaded rod so as to be adjustable relative thereto.

9. A base support according to claim 8, wherein the bracket is braced against the arms through two screwthreaded rods.

10. A base support according to claim 1, wherein the mounting means comprises a sheet metal plate which is attached in the region of the top side of the square-section tube.

11. A base support according to claim 10, wherein the sheet metal plate comprises two sections which are respectively arranged at the side of the square tube. aligned with its top surface and are braced against at least one arm.

12. A base support according to claim 1, wherein the arms carry vibrationdamping feet in the region of their free ends.

13. A base support for a rotary piston blower with a drive motor substantially as described herein with reference to, and as illustrated in, Figures 1 to 3 of the accompanying drawings.

Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1980. Published by the Patent Office, 25 Southampton Buildings, London, WC2A 1 AY, from which copies may be obtained.

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