DE2720408A1 - Fan impeller insert bush - has releasable fixing in impeller hub bore by grooves in bush engaged by complementary projections - Google Patents

Abstract

The insert bush (3) is intended for fitting in the bore (1) of a fan impeller. The fixing consists of elements on the outer bush wall releasably engaging complementary elements (2) on the inner wall of the bore. The elements may be grooves in the bush wall engaged by corresponding projections in the bore. There may be three such elements on the bush and in the bore. The elements may have curved, triangular or rectangular section. The bush may have a flanged end and may be a plastic extrusion moulding.

Description

DR. STEPHAN G. BESZEDES PATENT ADVOCATE

8060 DACHAU NEAR MÖNCHEN

POST BOX 11

ON HEIDE \

TELEPHONE: DACHAU «TI • ostKfMKfcfconto MOnchen (KZ Τ» «β M)

Account no. 138 »Tl bank account no. SMtNMAr Creto- m

0mtmt4nttnaoi1 (BLZ IM SU «) (WA BayartodM tataM

P 988

description

for patent application

CHRISTIAN SIMON

Munich

concerning

Insert socket for ventilator holes

The invention relates to an insert socket for ventilator bores.

The known blade fans have the disadvantage that their Bores have different dimensions or diameters and therefore when they are wedged onto the motor shaft, which also has different dimensions,

by the fan-side shaft ends of electric motors are not subject to standardization, tear or break if the dimensions are not suitable. This disadvantage will still be aggravated by the fact that the hole in the blade fan cannot be unscrewed, as there is no possibility of clamping consists in that their webs stand in the way, so that it is not possible to measure the irregularities in correct this way.

With these well-known difficulties in wedging the blade fan on motor shafts, the State of the art obviously largely accepted, with hardly any special mention in publications is received.

The invention is based on the object, while eliminating the disadvantages of the prior art, a means for achieving the ability to wedge the blade fans onto motor shafts of different dimensions with adaptability to create this.

The above has surprisingly been achieved by the invention.

The subject of the invention is an insert bushing which is characterized in that it can be fastened in a ventilator bore. The insert socket has how As its name suggests, an expediently continuous bore, which is expedient as usual ventilator bores for the Wedging is carried out on the motor shaft ends.

The invention brings with it the great technical progress that the insert bushing according to the invention prevents the wedging of the fan blades on different motor shafts

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Dimensions permitted. Namely, if the bore of the insert bushing is not on the motor shaft, on which it and by wedging the vane fan, it fits, in contrast to the bores of the previous vane fan can easily be turned to the desired size without difficulty. It is even possible to use insert sockets a so-called "zero shaft hole" (diameter: approx. 20 mm), ie a hole into which the boring tool can just be inserted, to have it ready and to turn it to the desired size. This is for example, of importance when electric motors of the same size with strongly fluctuating dimensions their fan-side shaft ends or electric motors of unknown type are to be used.

According to a particularly advantageous embodiment According to the invention, the insert bushing has guides on its outer wall for its releasable fastening in the vane fan bore by means of complementary guides on the boundary wall of the ventilator hole. This has the particular advantage of simplicity and low effort.

The guides on the outer wall of the insert bushing are preferably guide grooves and the complementary ones Guides on the boundary wall of the ventilator bore guide webs.

The outer wall of the insert socket and the boundary wall of the ventilator bore expediently have at least two tours each. There can also be a large number of guides, for example 20. Particularly preferred but has the outer wall of the insert socket and the loading

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Boundary wall of the ventilator hole three guides each. This is because this involves the least possible effort with a secure attachment of the insert socket.

The guides can be semicircular, triangular, rectangular or square in shape. Preferably they extend over the entire length of the outer wall of the insert socket or the boundary wall of the ventilator hole, But you can also only cover part of the length of the outer wall of the insert socket or the boundary wall the blade fan bore extend; there may also be interrupted tours. Also in the rest of the guides can be arranged in any way.

The insert bushing advantageously has a flange-like extension serving as a stop at one end on.

According to other embodiments of the invention, the Insert socket on its outer wall for fastening in the ventilator hole with the boundary wall of the ventilator hole Can be screwed or glued. In the former case, the outer wall of the insert socket a screw thread, which in a complementary screw thread on the boundary wall of the vane fan bore is screwed, and in the latter case, both the outer wall of the insert socket and the Boundary wall of the ventilator hole smooth (without grooves and bars).

The size of the insert socket and the dimensions of the individual components are variable and each dimensioned in such a way that that they correspond to the intended application. Of the

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Diameter of the blade fan bore in which the inventive Insert bush is to be attached, must of course with the same diameter of the shaft end of the motor, on which the blade fan is to be wedged must be larger than with the known designs, which are not for the Inserting an insert socket are set up.

The insert socket is advantageously manufactured from plastic by injection molding. The blade fan, in which the insert socket is to be used can advantageously be made of such a plastic. It Both the insert socket and the blade fan can be made from plastics commonly used for blade fans be made.

The appropriate wall thickness of the insert socket depends on the required mechanical strength and the Material from which it is made from.

The use of the insert socket according to the invention can simply done in such a way that it is inserted into the blade fan hole and fixed in it, for example, in the event that the insert socket is flanged at one end and the outer wall of the insert socket guide grooves extending over their entire length and the boundary wall of the blade fan bore has complementary guide webs extending over its entire length by inserting the insert bushing with their guide grooves on the complementary guide webs of the boundary wall of the vane fan bore sliding into the ventilator hole until the flange-like extension of the insert socket hits the

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I "272CU08

Wall of the blade fan hole. The hole in the insert socket, which now practically represents the bore of the blade fan, can now be keyed onto motor shaft ends in a known manner.

The invention will be explained with reference to the following exemplary presentations in conjunction with the accompanying drawings explained in more detail.

Here are:

Figure 1 is a side view of an embodiment of the insert socket according to the invention,

Figure 2 is a plan view from below of the embodiment of the invention shown in Figure 1 Insert socket,

Figure 3 is a plan view of the embodiment of the invention shown in Figure 1 Insert socket with an associated blade fan in which it is inserted,

Figure 4- a section along the line A B of

Figure 3 and

FIG. 5 is a broken plan view of the embodiment shown in FIG Insert socket according to the invention with an associated Blade fan hub, also broken off.

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In the figures, an insert bush 3 has three guide grooves 4- of semicircular shape, which in three guide webs of a semicircular shape of a blade fan bore 1, which is formed in a hub part of the blade fan, can be fitted are on. The blade fan bore 1 thus acts as an insert socket carrier. The insert socket 3 has one end of a flange-like extension serving as a stop 5. usual grooves 6 on the boundary wall the bore of the insert bushing 3 are used for wedging onto engine shaft ends.

Claims

809843/0536

AO

L eerse ι \ e

Claims (7)

Claims Insert socket, characterized in that it can be fastened (4, 2) in a ventilator hole (1) is. 2.) insert socket according to claim 1, characterized in that it guides (4) on its outer wall their detachable fastening in the ventilator hole (1) by means of complementary guides (2) on the boundary wall of the ventilator hole (1) having. 3.) insert socket according to claim Λ or 2, characterized in that the guides (4) on the outer wall of the insert socket (3) guide grooves (4) and the complementary guides (2) on the boundary wall of the vane fan bore (1) guide webs (2) are. 4.) insert socket according to claim 1 to 3 »characterized in that the outer wall of the insert socket (3) and the boundary wall of the ventilator hole (1) each have three guides (4, 2). 5.) insert socket according to claim 1 to 4, characterized in that that the guides (4, 2) are semicircular, triangular, rectangular or square in shape are. 6.) Insert socket according to claim 1 to 5 »characterized in that that it has a flange-like extension (5) at one end. - 9 809843/0536 ORIGINAL INSPECTED 7.) insert socket according to claim 1 to 6, characterized in that it is made of plastic Injection molding is made. / 0536