DE1428195A1 - Room heater equipped with a fan and method for generating a gas flow - Google Patents

Description

II.Vo Philips'GIoeilWpenfabrieken, Eindhoven / Holland

"Hit a fan-equipped space heater and Method for generating a gas flow "

The invention particularly relates to a fan on a fan with an electric heating body for space heating.

In fans for household use, such as air extraction devices for pressure fans, air circulation For cooling purposes in warm weather and heating rooms in cold weather, silence during operation is the most elegant .Requirement.

Certain industrial purposes for me, e.g. 3 «grain drying, Silence is not particularly important, but 7 fans for these purposes must generally work as expediently as possible and a uniform, essentially not deliver turbulent air flow »

Secondary requirements, which are made of fans for the Z: vs, especially for room heating, the so-called "fanheaters", are small dimensions for a certain heat yield, an appropriate heating of the air flow, a small temperature control of the housing when needed and safety both mechanically and also electric.

,, V ^ r ₇ ,. “. ... ,,,,,, _ef; . ·. _c htspunkt it is or \ / ünscht that fans,

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? both industrial types and Τν ±, \ ι for: -.. £ A "-sbedarf, are made up of parts that relatively t ^ iach manufacture and assemble Next Wheeling I ¹ GiIe Preferably, must be able to be easily produced, so that there are no static, dynamic or aerodynamic balancing prolulsions.

The invention aims at a Yentilator or space heater create that meets the above and other requirements.

The Yentilator according to the invention contains means for generating two gas flows which each have a combined longitudinal and rotational movement, v / whether the rotational components are in the same direction and the longitudinal components are opposite to each other and the flows are combined by at least one to run outgoing electricity _{or similar}

By the term "gas" is meant any gaseous!, Tedium inclusive To understand air.

The means generating the current preferably consist of two more or less coaxially arranged at some distance from one another. bladed propellers driven by a drive mechanism, ζ. Β * an electric motor, rotated in the same direction .. These propellers can be arranged at the end and preferably just inside a partially cylindrical channel or / indkanal of essentially elongated cross-section, which no further guide means for the gas flows "and an outflow opening which extends essentially over the whole or a rope of the length of the channel.

With a suitable arrangement of the I bracket leaves, each Propeller draw a stream of gas into the duct into which the '

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LMng component of each stream -converted into a rotation component becomes, 30 that the currents combine and with exit the opening at a considerable speed.

It has been found that with a suitable lorm of the canal, Arrangement of the propellers and shape of the blades dc, s gas leaves the opening at a speed which is essentially constant over the entire width and length is essentially not turbulent. Also has the electricity in front of the opening a tendency to converge and generates on this way a focusing effect. This is important especially when the air is heated as this is at a distance creates a heat area of suitable size in front of the fan.

Experiments have shown that a fan of the above Type is silent during operation, and it has been shown that this is partly the opposite of the guest flows and partly It is thanks to the fact that the channel acts as a damper that suppresses the audible frequency oscillations caused by the entering Gas being given through the blades cushions before the combined gas flow exits the duct.

The invention is explained in more detail with reference to the drawings. Fig. 1 is a front view of a fan heater.

Figure 2 is a perspective view of a fan and heater unit.

Figure 3 is a top plan view of the Iotor blade assembly without Casing.

? ir. 4 is a fedsrnae ^ avoplunc, shown in enlarged hatred.

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tig, 3 is a sndaasicfct length of $ i & le IMf from I ¹ Ig. 1 · Hg «β is a view of the volume along the j & iaie 7Ι * ΎΧ from fig '. fig »T is an end view of the heater near" Pig »1 $ and

Pig, 8 is eliu cross-section of the endab & eoktt & g of the lrhitiseyge-; house along the line YIII-VIlX from fig »? ·

In OCE Zeichnu "g shows Jig · 1 a Heizlti $ tes> geäöß dter invention in front view" A housing 4§ one ^bent: Porm has has on the front a rechtgokige opening! in which a protective grille 2, through which the air escapes, is attached. The front of the housing has switches 3 for controlling the ventilation of the ventilator and the heating element, which are described below · ^ j

The actual fan is shown in perspective in FIG. It essentially consists of a channel or wind tunnel 4 »which is open at both ends and iffl essential has a son-oken-shaped cross-section * Br is in front of, preferably "made by a rectangular metal plate is bent to the desired shape. Sii rigidity des XCanal'es can also be increased in that in certain At intervals, depressions or hips 5 can be arranged * 33as one end of the plate is turned outward. li & d forms one Piansoh 6, who is at 'a certain distance from the other End of the plate is, whereby a "rectangular outflow opening is formed.

A Motpr propeller unit is arranged in the canal, such as in Pig. 3 is shown · The motor 7 is preferably'vom Type with shielded poles for use on AC networks,

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but can of course be of any other suitable type depending on the puncture and the available feed stream. The motor rotor has bearings 8, 9, which are supported in bridge portions which are attached to the laminated block, and an equal pair of bearings 10 _t 11, which may be type "oiliten" from the self-centering, is applied to the ends of the rods 12, 15 by similar bridge parts carried. The rods 12, 13 extend through the laminated engine block and are suitably secured, e.g. B. duroh fit with oversize, attached.

Multi-bladed propellers H, 15 are attached to half-shafts 16, 17 which are mounted in bearings 10 and 11. Any of these Shafts is connected to the motor shaft 18 by a resilient coupling 19, 20. One of these couplings is according to a preferred embodiment in Pig. 4 shown in cross section and contains a cylindrical bushing made of resilient material, e.g. B Rubber, with a smaller inner diameter in the free state than the shafts · The motor shaft 18 is with a circumferential Groove 21 is provided and each half shaft 16 of the propeller provided with a similar hat 22 of smaller dimensions. the The resilient Buohse is only stretched by a suitable tool and brought onto shaft 18. When the tool is withdrawn, the bushing contracts resiliently so that they the shaft 6 engages and establishes a firm connection with it because it lies in the relatively deep hat 21. The socket

is then brought onto the shafts 16, 17 via the hat 22, whereby Erwüneohtenfalle a resilient spacer 23 between the ends of the shafts can be arranged. In this way creates a resilient connection between the waves, which a small electrical fault or vibration during operation

. cancels · Since the groove 22 is less deep than the hat 21, the shafts t6> t7 can be removed more easily from the couplings than the motor shaft 18. This is advantageous for assembly and maintenance purposes.

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The daxgestellten in Example propellers 14 _S 15 are the six leaves · The propellers are "bent out of a flat circular metal plate have been shown _SiOH% that flat blades * which are bent at an angle of about 50 ° from the flat plate, provide a gutsn airflow with the desired longitudinal and Eotationskomponenten and no noise during operation do, "other forms and Yfinkel as well as other blades number can be chosen, of course ^ depending on specific circumstances, and propellers of a material other than metal, for" B ₉ plastic, can can also be used · In this case the propellers can be produced by injection molding, γ / whether nylon is a suitable material «

The entire motor-propeller unit from Fig. 3 can be fastened in the channel 4 in that the motor body is fastened in the channel by suitable means, e.g. B with a non-dargerstellt en ironing wherein the channel is provided with openings _0, as shown in Figure "2 and _5? so that the structure with its terminals can extend through the channel into the space between the channel 4 and the housing 1 (see Fig. 5). Resilient means can be used in the attachment ^ to prevent = that the channel works as a baffle for mechanical vibrations of the motor-air screw unit.

The propellers are arranged such that they L _u ft in the channel suck with the correct direction of rotation (clockwise in Figs. 5 and 6), so that the air substantially tangentially exits the outlet opening at the lower part of the fan.

The air heating resistance bodies are supported on their ends by ceramic plates 24 and 25 and between these ends by ke-

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ramieohe plates 26 and 27, supported. The plates 24 and 25 have projections on their upper and lower edges which land in the flange 6 and the side edges of the lower wall of the Kanalea lie (see Pig · 2 and 6), these plates due to the natural spring force of the spiral heating element are held in place until the Sinheit is placed in the housing is · The intermediate plates 26, 27 can also be similar Beware of lying in the side edge of the flange 6 and the front edge of the lower rope of the kenales to keep them at the correct distance to hold in their place

This fan heater unit can pass through one end of the housing to be placed in the housing and by self-tapping Screws or screws which extend through holes in the bottom of the housing and which are screw-threaded in Have 27 rests (Fig. 6) formed on the duct or attached to it to be attached in their place.

The Hint -shaped with ^tt eohlüsselloch "grooves can (not shown) since e of the housing are provided, the hung the device to the wall may earth v / · Also, or in addition, as shown in FIG ·, Sohenkel can be arranged so that the device does not rest on the floor. These legs can preferably be easily removed so that the device can be packed for transport.

The electrical connections to the switch and heater and motor can be made before the fan-heater unit is placed in the housing, with the final assembly being completed before the end cover of Figures 7 and 8 is attached to it Place is arranged · This Deekf! vmjk a similar cover at the other end of the housing 1 can be made in a suitable manner, e.g. B · be fastened to the housing with screws.

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To have a visual indication when the device is on, -what a generally recommended safety measure for heaters fan of this type, a monitoring lamp 29 (fig. 5), gate can be seen, which is about in the middle of the channel opposite · the motor 7 through the wall. The lj_oht "illuminates the inside of the channel and can be seen through the grille 2. As usual with three types of devices, the switches can be connected to * - be arranged so that they can operate the device for different speeds of the fan and switch for different degrees of heating, whereby the electrical system is preferably such » d.that the heater cannot be switched on if the fan is not working.

The following serves as an indication of the compact design of the example described: the external dimensions of the housing are about 25 cm long, 15 cm high and 12 cm deep. The heater has a load of 2 kW and the fan, which has blades 10 cm in diameter with 1500 revolutions per minute, delivers at least 30 nr air per minute. The temperature control of the housing is negligible as the incoming air flows over practically the entire surface of the duct. The motor and the shaft bearings are also adequately supported by the air currents chilled. .

As mentioned above, during normal operation with the heating, fully switched on, there is little or no temperature increase in the Channel on. If, however, one or both inlet openings (or the outlet opening) are inadvertently completely or partially blocked could seriously increase the temperature of the heater and the housing. To eliminate this eventuality, a temperature-sensitive body, e.g. a bimetal switch, arranged at a suitable point in the channel and electrically connected v / ground that he the heater and / or

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, the GTQie OertSt switches off when such a temperature increase occurs »The Sohalter is preferably of a type which has to be postponed from Hani, so that he does not automatically returns to "an" on "position when the temperature again, becomes normal.

The relatively small dimensions of the described οέ- [ advice "are partly due to the fact that the propeller of the propellers is arranged in the channel. It has been found that this does not adversely affect the air flow in the duct.

The invention is not limited to this arrangement iet Jedooh, \ AUOH since the motor outside of the channel at the ends of which a

can be arranged, or in some palls two mo- ; gates that each drive a propeller are arranged.

It will be evident that the device described above is only one ^; Example of the application of a fan according to the invention, which can also be used for other purposes. It will also be evident that the speed of the exiting air flow is somewhat dependent on the surface area of the opening, and this in turn will depend on the length of the duct and the spacing of the air clusters. The channel need not have as * in the example described has a substantially constant cross-section but may, for example, for 'outside abge-Rounded ainfluß- and / or orifices. Also can

mehr.ale a drain opening can be provided, for example if a "bleed" feed is required, the independent one. acts depending on the main gas outlet. In such babble the etched opening can preferably be substantially tan. be arranged gentially 'as with the main outlet opening "

Patent claims:

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Claims (12)

Patent claims % Yerfahren for generating a gas flow with considerable Speed, characterized; that a first stream with combined longitudinal and rotational components and also a second stream that has similar motion components , the two streams being joined so that the rotational components are in the same direction and the longitudinal components lie in opposite directions and the two streams are combined into at least one exiting stream will. 2. Yentilator with means for generating τοπ two gas streams, thereby characterized in that each gas stream has a combined longitudinal and rotational movement, the rotational components being in the same direction and the longitudinal components facing each other, the streams being combined and providing at least one exiting stream. -o ¹ 3. Tentilator according to claim 2, characterized in that «it has a partially cylindrical channel without further mitigation means for the gas streams and with at least one outlet opening which extends over practically all or part of the length of the channel, further two separate air, screws that are coaxial in the channel and each. of the channel are arranged in the vicinity of one end and a drive train for rotating the L _u ftschrauben in the same direction. 4. "Fan according to claim 3? Characterized in that the propellers each have a number of blades and their direction of rotation is such that the gas sucked in at the ends of the channel leaves the channel essentially tangentially through the outlet opening. 809812/0445 5 · Fan according to claim 3 or 4 »characterized in that the drive mechanism is an electric motor which is arranged essentially in the middle of the channel between the propellers 6. Fan according to claim 5 # characterized in that it contains a Jäotor-Iruftsohrauben unit in which each propeller duroh a half-shaft is carried, which is mounted in a bearing that is supported by a stiffener attached to the motor is carried, each half-shaft being resiliently coupled to the motor shaft. ; 7. Fan according to claim 6, characterized in that the Engine-air-drilling unit by means of connecting the engine to the Connect channel, is arranged in the channel. 8. Fan according to claim 7 # daduroh characterized in that the , ί mentioned fastening means have a resilient member or resilient ^f members. 9 · üaumerhiteer with a fan according to one of the claims to 8, characterized in that it has one or more heating body, which is arranged in the exiting stream | are· 10 · Haumerhitaer according to claim 9, characterized in that it Tone hand operated switch has the motor and a or selectively excite several of the mentioned heating bodies, the device being such that the heater body (s) cannot be energized unless the motor is energized is· 11. Tree heater according to claim 9 or 10, daduroh marked - 12 -809812 / 0U5 net that it has a temperature sensitive switch, which reacts to the temperature in the duct to switch off the power supply to the heating body (s) or the heater and the liotor if the air flow through the duct from any Is basically blocked. 12. Space heater according to claim 9, 10 or 11, characterized in that that it "has a lamp which is arranged in the duct and connected to the power source in order to illuminate it when the device is switched on. 809812/0-U5