DE19721367A1 - Fan or impeller volute in pair of half shells for suction fan of sealed boiler combustion chamber - Google Patents

Abstract

The fan or impeller has two cast aluminium mouldings forming a scroll-shaped housing for centrifugal fan which is driven by an electric motor mounted on one of the castings by means of bosses raised on the casting and rubber bushes attached through holes in the motor bracket. The two half shells (1,2) are assembled together to form the air volute for a centrifugal fan (6) which is driven by an electric motor (7). The upper half shell (1) has three equispaced pegs (3) on its upper surface on equal radii. The motor and fan assembly is carried on a mounting bracket (5) with three corresponding holes into which are fitted rubber bushes (4).

Description

The present patent application relates to a screw for the suction impeller, which is on boilers with tight or abge closed combustion chamber is made up of a pair of opposing half shells.

As is known, these boiler models are equipped with a centrifuge Galventilator provided that the burner a suction Combustion air flow guaranteed and the the forced smoke train allows.

The worm housing the impeller becomes more normal as firmly attached to the support frame of the boiler, during the Motor on the outside of the closed bottom of the snail is attached by a bracket, which consists of a three arm plate, with each arm regularly in one Angle distance of 120 ° and a mounting hole points.

The attachment of said bracket of the group that made Motor and impeller is made at the bottom of the screw by interposing rubber damping elements to avoid a complete transmission of group vibrations Motor impeller on the worm and from there to the kes sel housing and consequently to avoid arising from it the annoying noises.

In detail, the three mounting holes of the above Support bracket used as many cylindrical rubber sleeves, each being outside a pin that comes from the bottom of the Protruding snail, which is generally made of pressed sheet metal is manufactured, inserted and fastened.

In other words, the bracket of the group outsources that  The motor and impeller consist of three cylindrical rubbers sleeves, each supported by corresponding pins the one that comes out of one piece with the screw bottom are working on which when pressing the sheet as well many holes for the fastening screws of the said pin are to be attached.

The attachment of these three pins outside the snail flooring is time-consuming and labor-intensive, especially if you considering that the cost of assembly has a significant balance item of the general manufacturing cost of this particular Model of centrifugal fans on the boilers with a sealed combustion chamber.

The invention has for its object the manufacturer costs of the mentioned types of centrifugal ventilators by reducing the assembly cost of the three pins on the Screw bottom in which the three cylindrical rubber sleeves used and attached to the bracket of the group Support the motor impeller of said centrifugal fans, omitted.

This object is achieved by the screw according to the invention the features of the characterizing part of claim 1 ge solves.

The said three, protruding from the bottom of the snail Pins are built into the same screw, said ones three pens of the same material and during the same Press phase as the screw is made.

In detail, the screw model according to the invention consists of two opposing, pressure-pressed aluminum half-shells, the rear half-shell on the bottom three outside Has pins that are at an angular distance of 120 ° Find.

Forming the pins in one piece with the snail bo  that solves the above problem by not at all occurs and consequently all disadvantages arising from it are automatically eliminated.

The screw is preferably in the form of die-cast aluminum snail trained.

The invention is described below with reference to the accompanying drawing explained in more detail; show in it:

Fig. 1 shows a centrifugal fan, with which he inventive screw according to the line passing through the center of rotation of the impeller;

Fig. 2 is a top view of the outside of the rear half-shell of the snail according to the invention;

Fig. 3 is a cross section of Fig. 2 along the line AA.

Referring to the above There are illustrations of the invention appropriate snail from an opposite pair of Druckge pressed aluminum half-shells.

1, three pins 3 are formed on the rear half-shell 1 in a single piece with the half-shell, the side of its outer projecting and located at an angular distance of 120 °.

These three pins 3 serve as a holder for as many zy-cylindrical rubber sleeves 4 , which are inserted into corresponding holes, which are worked out from the bracket 5 of the group consisting of the impeller 6 and the corresponding electric motor 7 .

The device according to the invention makes it possible both the cost of the three pens previously closed on the Screw bottom were attached, as well as their assembly and Avoid mounting costs on this floor.

Claims (2)

1. worm for the suction impeller, which is attached to boilers with a sealed combustion chamber, consisting of a pair of opposing half-shells ( 1 and 2 ), characterized in that on the rear half-shell ( 1 ) three pins in one piece with this half-shell ( 1 ) are formed, which protrude from its outside, are at an angular distance of 120 ° and mimuffen serve as a holder for as many cylindrical rubber ( 4 ), the latter being inserted into corresponding holes, which worked out of the bracket ( 5 ) of the group are, which consists of the impeller ( 6 ) and the corre sponding electric motor ( 7 ). 2. Screw for the suction impeller, which is attached to boilers with a sealed combustion chamber, according to claim 1, characterized in that the half-shells ( 1 and 2 ) are made of pressure-pressed aluminum.