DE60109577T3 - Tangential ventilation device - Google Patents

Abstract

There is provided a tangential ventilating device (1) wherein the fan (2; 2a) is defined by one (6) or more (6a, 6b) ventilating units; each unit in turn being defined by a one-piece body molded from plastic material and having two opposite longitudinal end portions (7, 8; 7a, 8a, 7b, 8b) substantially perpendicular to the axis of rotation (R) of the fan, and a number of longitudinal blades (10; 10a, 10b) spaced circumferentially apart and substantially parallel to one another and to the axis of rotation. <IMAGE> <IMAGE> <IMAGE>

Description

The The invention relates to an improved tangential ventilating device, in particular for household ovens, refrigerators, air conditioners and electric domestic appliances generally suitable.

As is known, the trend is increasing in the ventilation of stoves and in cooling technology and air conditioning systems generally to tangentially driven fans whose characteristics (eg low noise level, good pressure / air flow ratio and Compactness) represent an excellent cost / design compromise.

in the Generally known fans of this type have an engine, usually a shaded pole motor and a tangential rotor inside a snail up.

Of the Engine basically has a packet of laminations and a Rotor whose shaft rotates on bushes which are supported by two supports, which is made of a non-magnetic material (usually punched out or die-cast aluminum). At least one socket is spherical for self-alignment and is held in place by means of a metal spring, which occurs in different forms and on the support different ways can be adapted.

Of the Tangential rotor (i.e., which is substantially tangential to the flow to its outer diameter works and usually longer than its diameter is) is usually from a number of longitudinal blades which are each held from or to any one Proportion are used in respective seats, which in a number of Transverse discs are formed, and both the blades and the discs are made of a stamped metal (typically Aluminum). Rotors of this type obviously have the disadvantage that they manufacture and arrange a large number of component parts exhibit.

The Snail also has a number of stamped metal components, which are riveted or welded together, and what is the same Problems in axial alignment, squareness and in parallelism, a high rate of ejection, sharp edges, poor appearance, from stringent painting of the parts and regular waiting the punching and mounting equipment means.

GB-A-1421795 discloses a plastic rotor which incorporates one or more rotor wheels which are joined together by riveting, ie by a permanent connection which can not be released.

It is therefore an object of the invention, the aforementioned disadvantages of the known prior art, in particular by eliminating a tangential ventilator is provided which is practical for a high level of Performance and long-term reliability and cheap and easy to produce.

According to the invention is a tangential ventilator as in the appended claim 1 is provided.

The inventive device Therefore, has a rotor, which unlike the prior art not manufacturing and mounting a large number of separate component parts and therefore for a considerable saving in terms of the production costs and time. The rotor can too by axially connecting two or more modular ventilation units be produced, so that, in addition to simple juxtaposition of the individual units without complicated assembly (which is really special simple and fast), the blades of each unit can be offset for cutting off the resonant frequency of the rotating rotor and to achieve optimum airflow and air pressure and to reduce the noise level.

The Snail is also in one piece formed, which is cast from suitable plastic material is, so they are cheap, of desired Appearance (color, finish, not flammable) and desired Dimensions and within certain tolerances with respect to axial Alignment and parallelism is.

According to one Another aspect of the invention is the rotor and motor mounts also made of plastic (and therefore non-magnetic) material and need in contrast to known holders no springs. The spring is actually going through elastic approaches replaced, which, define the seat of the spherical socket, so that the holder is still complete is functional, including, that he is self-aligning, but at the same time for a significant Saving in terms of the number of component parts and the assembly time ensures.

A not restrictive Embodiment of The invention will be described by way of example with reference to the accompanying drawings described in which:

1 shows a plan view of a tangential-ventilating device according to the invention;

2 a partial sectional side view of the Figure 1 device shows;

3 shows an exploded perspective view of a rotor which is applicable in the Figure 1 device;

4a . 4b show a side or front view of a first component of the Figure 3 rotor;

5a . 5b show a side or front view of a second component of the Figure 3 rotor;

6 shows a detail on a larger scale of the Figure 3 rotor;

7 shows a perspective view of a screw, which forms part of the figure-1 device;

8th shows a perspective view of a rotary element holder, which is suitable for the figure-1 device.

Regarding 1 and 2 shows number 1 a total of a tangential-ventilator, z. B. for a known household stove (not shown). The device 1 has a tangential rotor 2a that is rotatable within a snail 3 is housed, a grant 4 and a motor 5 on which mechanically with the rotor 2a connected is.

Regarding 3 to 6 has a rotor 2a two modular ventilation units 6a . 6b on which axial connection means 26 have for axial endwise assembly.

The unit 6a is defined by a one-piece body of molded plastics material (e.g., polyamide) and has two opposite longitudinal end portions 7a . 8a which is substantially perpendicular to the axis of rotation R of the rotor 2a are, and a number of longitudinal blades 10a which are arranged circumferentially at a distance from each other and which are substantially parallel to each other and to the axis of rotation R and between the end portions 7a and 8a extend longitudinally.

The end section 7a is essentially disc-shaped and has a central disc 31 which is coaxial with the axis of rotation R; the end section 8a is from a ring 32 defined, which is radially outward with respect to the disc 31 extends; the blades 10a extend radially at one end from a radially outer, peripheral edge 33 the disc 31 and are butt-joined at the opposite end and substantially at one end 34 from ring 32 inscribed; and the blades 10a to that they are at the peripheral edge 33 the disc 31 are connected, each have reinforcing sections 35 on, which with a front side 36 the disc 31 connected, which the end portion 8a is facing.

Equally, the unit is 6b defined by a one-piece body of molded plastic material (e.g., polyamide) and has two opposite longitudinal end portions 7b . 8b substantially perpendicular to the axis of rotation R of the rotor 2a are, and a number of longitudinal blades 10b which are circumferentially spaced from each other and are substantially parallel to each other and to the axis of rotation R and extending longitudinally between the end portions 7b and 8b extend. The end section 7b is essentially disc-shaped and has a disc 41 which is coaxial with the axis of rotation R; and the end section 8b is from a ring 42 defined, which is radially outward with respect to the disc 41 extends. In this embodiment also have the end portions 7a . 8a and 7b . 8b from each unit 6a . 6b Therefore, each solid sections and hollow portions, wherein the solid portions of the one end portion are inserted into the hollow portions of the opposite end portion.

The shovels 10b are at one end radially from a radially outer, peripheral edge 43 the disc 41 and are butt-joined at the opposite end and substantially in one face 44 from ring 42 enrolled. The shovels 10b each have reinforcing sections 45 on, which with an end face. 46 the disc 41 connected, which the end portion 8b is facing.

To hold the rotor 2a in a rotatable way is the disc 31 with a hollow shaft 50 united provided; and the disc 41 has a central passage seat 51 for accommodating a known drive element, for. B. a disc of elastic material as previously described.

The axial connection means 26 has a number of (eg four) connection pins 52 on which of the ring 32 the unit 6a be worn and from the front and in interlocking - or bayonet wise as shown in the non-limiting example - in each passing seats 53 in the ring 42 of unity 6b can be used.

As in detail in 6 shown is every pen 52 essentially L-shaped and has a root portion 54 which axially from a surface 55 , ent opposite to the surface 34 , the ring 32 protrudes, and a head 56 which is substantially perpendicular to the root section 54 to be engaged with ring 43 is. Every seat 53 has a peripheral insertion section 57 on which a narrow or narrow section 58 for latching connection to a respective pin 52 Has; and shovels 10b which to the seats 53 are adjacent, have respective recesses 59 for enabling the insertion of the heads 56 ,

Two alignment notches 60 are on respective outer edges of rings 32 . 42 designed for correct positioning of units 6a . 6b during installation.

The ring 32 has a centering collar 61 on which axially from a radially inner, peripheral edge 62 of the ring 32 protrudes and into the ring 42 is pluggable.

Advantageously, the units 6a . 6b connected so that the respective blades 10a . 10b instead of being axially aligned with each other, are circumferentially offset to cut off the resonant frequency of the rotating rotor 2a and so as to achieve optimum airflow and air pressure and to reduce the operating noise level. More special are the blades 10a . 10b of the units 6a . 6b offset by half a gap (ie each blade 10a the unit 6a It's halfway between two shovels 10b of unity 6b arranged).

Regarding 7 is the snail 3 molded from one piece of plastic material, eg. As polyamide, and has two parallel, longitudinally opposite sides 70 . 71 on, which by means of a curved air-conveying wall 72 and by means of a front longitudinal element 73 connected, which is the curved wall 72 is facing and an air outlet 74 Are defined. The pages 70 . 71 also have respective side flanges 75 in which holes 76 are designed for attachment to a support surface.

The conveyor 4 (for the sake of clarity not in 7 shown; please refer 1 and 2 ) is on the longitudinal element 73 fastened: advantageously, the conveyor is 4 in one piece with the snail 3 poured, so the device 1 has a unified unit which is ready for mounting on the application device.

The pages 70 . 71 each have self-aligning holders 100 . 101 (shown in 7 respectively. 8th ) for supporting the rotor 2 or 2a and the engine 5 in a rotatable way.

Every holder 100 . 101 has a base element 102 with a seat 103 for a known, spherical bush 104 on. The basic element 102 has a circular collar 105 on which axially from a surface 106 of the base element 102 projecting; and three elastic approaches 107 that of the base element 102 protrude, are at a distance from each other (eg 120 ° from each other) around the collar 105 arranged circumferentially, define the seat 103 and are block-shaped for resilient cooperation with the bushing 104 and so the jack 104 inside the seat 103 to wear and to hold.

More specifically, the respective free ends of the lugs 107 the respective contact sections 108 which cooperate with a curved side outer surface 109 the socket 104 are designed to prevent any axial or rotational movement of the socket 104 and only allowing substantially transverse alignment movement of the sleeve 104 which within the seat 103 due to the elasticity of the lugs 107 axially locked.

The approaches 107 and the collar 105 are united in one piece with the base element 102 trained, z. B. from the same plastic material as the screw 3 cast.

In the non-limiting example, which is incorporated in 7 is shown is the holder 100 in one piece united with the page 70 from snail 3 designed so that the respective base element 102 from a section of the snail 3 is defined in itself. It is understandable, however, that the holder 100 may be a separate component, which is connected to the screw 3 is adjusted, for. B. is inserted in a seat, which in the side 70 is formed as with the dashed line in 7 shown.

The holder 101 on the other hand, a substantially known disc-shaped body 110 which is with the side 71 through bayonet fasteners 111 is connected, which in respective seats 112 are inserted, which are around a central hole 113 in the page 71 are formed, in which case the base element 102 from a portion of the disc-shaped body 110 is defined, which in one piece with the base element 102 the collar 105 and the approaches 107 is poured.

Claims (12)

Tangential ventilation device ( 1 ), which has a rotor ( 2a ) of the type with longitudinal blades, which are substantially parallel to the axis of rotation (R) of the rotor, wherein the rotor ( 2a ) two or more modular ventilation units ( 6a . 6b ), which axial connecting means ( 26 ) have for axial endwise assembly, each unit being defined by a body made of Plastic is cast in one piece and two opposite longitudinal end sections ( 7a . 8a . 7b . 8b ), which are substantially perpendicular to the axis of rotation (R), and a number of longitudinal blades ( 10a . 10b ) which are circumferentially spaced apart, substantially parallel to one another and to the axis of rotation and extend longitudinally between the end sections, the device being characterized in that the blades ( 10a . 10b ) of each unit ( 6a . 6b ) at one end from a peripheral edge ( 33 . 43 ) of a first end section ( 7a . 7b ) of the unit protrude radially and are bluntly connected to the opposite end and into a ring ( 32 . 42 ) of a second end section ( 8a . 8b ) of the unit are substantially inscribed; and that the axial connection means ( 26 ) one of the ring ( 32 ) of a first unit ( 6a ) held number of connecting pins ( 52 ), which in respective seats ( 53 ) in the ring ( 42 ) of a second unit ( 6b ) interlocking frontally or bayonettweise are plugged to the snap connection of each seat ( 53 ) with a respective pen ( 52 ). Device according to claim 1, characterized in that the end sections ( 7a . 8a . 7b . 8b ) of each unit ( 6a . 6b ) are formed to have respective solid portions and hollow portions, the solid portions of one end portion being insertable into the hollow portions of the opposite end portion. Device according to one of the preceding claims, characterized in that the units ( 6a . 6b ) are interconnected so that the respective number of blades ( 10a . 10b ) are offset. Device according to one of the preceding claims, characterized in that each pin ( 52 ) is substantially L-shaped and has a root portion ( 54 ) and a head ( 56 ) which is substantially perpendicular to the root portion (FIG. 54 ), each seat ( 53 ) a peripheral insertion section ( 57 ) with a narrow or narrow section ( 58 ) has for latching connection with a respective pin ( 52 ). Device according to claim 4, characterized in that the blades ( 10b ), which are adjacent to the seats ( 53 ), respective recesses ( 59 ) have to allow the insertion of the heads ( 56 ). Device according to one of the preceding claims, characterized in that the units ( 6a . 6b ) respective first end sections ( 7a . 7b ), which respective discs ( 31 . 41 ), and respective second end portions ( 8a . 8b ), which of respective rings ( 32 . 42 ) which are directed radially outwards with respect to the respective disks, the blades ( 10a . 10b ) units of the respective peripheral edges ( 33 . 43 ) of the discs ( 31 . 41 ) extend radially and in the respective end faces ( 34 . 44 ) The Rings ( 32 . 42 ) are inscribed. Device according to one of the preceding claims, comprising a screw ( 3 ) having the rotor ( 2a ) rotatably accommodates and two parallel, opposite longitudinal sides ( 70 . 71 ) which has a curved, air-conveying wall ( 72 ) and via a front longitudinal element ( 73 ), which faces the curved wall and an air outlet ( 74 ), the device being characterized in that the screw ( 3 ) is molded in one piece from plastic. Device according to one of the preceding claims, characterized in that it comprises at least one of a side ( 70 . 71 ) of the snail ( 3 ) held self-aligning holder ( 100 . 101 ) for rotatably holding the rotor ( 2a ), the holder ( 100 . 101 ) a base element ( 102 ) with a seat ( 103 ) for a spherical bushing ( 104 ) and wherein the seat of a number of elastic approaches ( 107 ) defined by the base element ( 102 ) protrude, are arranged circumferentially at a distance from each other and are block-shaped for elastic interaction with the bushing ( 104 ), so that the socket ( 104 ) in the seat ( 103 ) is supported and recorded. Device according to one of the preceding claims, characterized in that the respective free ends of the lugs ( 107 ) respective contact sections ( 108 ) which cooperate with a curved, outer side surface (FIG. 109 ) of the socket ( 104 ) are adapted to prevent any axial or rotational movement of the sleeve and to allow only a substantially transverse alignment movement of the sleeve. Device according to the preceding claims, characterized in that the lugs ( 107 ) with the base element ( 102 ) are integrally formed and are preferably molded from plastic. Device according to one of the preceding claims, characterized in that the base element ( 102 ) axially out of the base element ( 102 ) projecting circular collar ( 105 ) and three at intervals of 120 ° around the collar ( 105 ) approaches ( 107 ) having. Device according to one of claims 8 to 11, characterized in that the base element ( 102 ) with one side ( 70 ) of the snail ( 3 ) is integrally formed.