DK177428B1

DK177428B1 - axial blower

Info

Publication number: DK177428B1
Application number: DKPA200900058A
Authority: DK
Inventors: Martin Rasmussen; Jens Hoepfner Moeller
Original assignee: Novenco As
Priority date: 2009-01-14
Filing date: 2009-01-14
Publication date: 2013-05-21
Also published as: DK200900058A; NO2387670T3; HUE036151T2; ES2662049T3; PL2387670T3; DK2387670T3; EP2387670B1; WO2010081813A1; EP2387670A1

Abstract

Der angives en aksiatblæser I at den type, der omfatter et i hovedsagen cir kulærcylindrisk blæserrør 2 med en indre og en ydre diameter, hvori der er indrettet en blæserrotor 11 med en ydre diameter, der ar lidt mindre end blæ serrørets 2 indre diameter, hvilken blæserrotor 11 har en rotoraksel, der i hovedsagen falder sammen med centeraksen i det cirkutærcylindriske blæ serrør 2, og er indrettet således, at blæserrøret 2 i sin ene ende har en suge- side og i sin modsatte ende en udstødningsside defineret ved blæserotorens I I udformning og omdrejningsretnir¿g, og hvor der foran blæserrørets 2 Su gesida er indrettet en tragt 3 med en indre overflade, der konvergerer ind mod blæserrørets 2 indre diameter. Aksialblæseren i er optimeret ved, at tragten 3 foran aksialblæserens sugeside er afskåret på en side, således at tragtens 3 yderste kant, set fra blæserrørets 2 centerakse, er mindre på den ne side end på andre sider.An axial blower is disclosed that the type comprising a generally circular cylindrical blower tube 2 having an inner and an outer diameter, in which is arranged a blower rotor 11 having an outer diameter slightly smaller than the inner diameter of the blower tube 2, which the blower rotor 11 has a rotor shaft which coincides substantially with the center axis of the circular cylindrical blower tube 2, and is arranged so that the blower tube 2 has at one end a suction side and at its opposite end an exhaust side defined by the design of the blower rotor II and rotational direction, and where in front of the blower tube 2 Su side is arranged a funnel 3 with an inner surface which converges towards the inner diameter of the blower tube 2. The axial fan i is optimized in that the funnel 3 in front of the axial fan suction side is cut off on one side, so that the outer edge of the funnel 3, seen from the center axis of the blower tube 2, is smaller on the ne side than on other sides.

Description

DK 177428 B1DK 177428 B1

Aksialblæser.Axial blower.

OPFINDELSENS ANVENDELSESOMRÅDEFIELD OF THE INVENTION

5 Den foreliggende opfindelse vedrører en aksialblæser af den type, der omfatter et i hovedsagen cirkulærcylindrisk blæserrør med en indre og en ydre diameter, hvori der er indrettet en blæserrotor med en ydre diameter, der er lidt mindre end blæserrørets indre diameter, hvilken blæserrotor har en rotoraksel, der i hovedsagen falder sammen med centeraksen i det cirkulærcylindri-10 ske blæserrør og er indrettet således, at blæserrøret i sin ene ende har en sugeside og i sin modsatte ende en udstødningsside defineret ved blæsero-torens udformning og omdrejningsretning, og hvor der foran blæserrørets sugeside er indrettet en tragt med en indre overflade, der konvergerer ind mod blæserrørets indre diameter.The present invention relates to an axial blower of the type comprising a generally circular cylindrical blower having an inner and an outer diameter in which is arranged a blower rotor having an outer diameter slightly smaller than the blower tube inner diameter having a blower rotor. rotor shaft which substantially coincides with the center axis of the circular cylindrical blower tube and is arranged such that at one end the blower tube has a suction side and at its opposite end an exhaust side defined by the design and direction of rotation of the blower rotor. The suction side of the blower tube is arranged with a funnel with an inner surface which converges towards the inner diameter of the blower tube.

15 TEKNIKKENS STANDPUNKTBACKGROUND OF THE PRIOR ART

Der kendes i dag adskillige forskellige udførelsesformer for aksialblæsere af den ovennævnte type, hvor tragten på blæserrørets sugeside har til formål at optimere virkningsgraden af aksialblæseren samt at minimere støjdannelse ved aksialblæserens sugeside.Today, several different embodiments of axial blowers of the above type are known, in which the funnel on the suction side of the blower tube is intended to optimize the efficiency of the axial blower and to minimize noise formation at the axial blower side.

2020

En konstant udfordring ved udvikling af sådanne aksialblæsere er således at opnå, at der under givne forhold, og med en given motoreffekt til at drive blæserrotoren, opnås en høj trykstigning og/elier en stor luftgennemstrømning.Thus, a constant challenge in developing such axial fans is to achieve that under given conditions, and with a given engine power to operate the fan rotor, a high pressure rise and / or a large air flow is achieved.

2 DK 177428 B12 DK 177428 B1

OPFINDELSENS FORMÅLOBJECT OF THE INVENTION

Det er på denne baggrund formålet med den foreliggende opfindelse at angive en aksialblæser af den indledningsvist anførte art, som egner sig specielt til placering i områder med begrænset højde, såsom garageanlæg og tunnel-5 ler, og som samtidig med simple midler og på en kosteffektiv måde tilveje-bringer en effektiv udnyttelse af den motoreffekt, der er til rådighed.Accordingly, it is the object of the present invention to provide an axial blower of the type mentioned in the introduction, which is particularly suitable for placement in areas of limited height, such as garage systems and tunnels, and which at the same time with simple means and at a cost effective way provides efficient utilization of the engine power available.

Dette opnås ved brug afen aksialblæser af den indledningsvist anførte art, som er speciel ved, at tragten foran aksialblæserens sugeside er afskåret på 10 en side, således at tragtens yderste kant, set fra blæserrørets centerakse, er mindre på denne side end på andre sider.This is achieved by the use of an axial blower of the type mentioned initially, which is special in that the hopper in front of the axial blower suction side is cut on one side, so that the outer edge of the hopper, seen from the center axis of the blower tube, is smaller on this side than on other sides.

Derved muliggøres nemlig, at aksialblæseren kan monteres på en overflade såsom et loft eller en væg, således at blæserrørets yderside er placeret tæt 15 på denne overflade, således at der, med et begrænset rum til rådighed, kan placeres en aksialblæser med en blæserrotor, som haren relativt stor ydre diameter.This allows the axial blower to be mounted on a surface such as a ceiling or wall, so that the outside of the blower tube is placed close to this surface, so that, with a limited space available, an axial blower with a blower rotor can be placed which hare relatively large outer diameter.

Ved at tragten er afskåret på to sider i forhold til blæserrørets centerakse, 20 opnås det, at aksialblæseren alt andet lige vil optage endnu mindre plads.By cutting the hopper on two sides with respect to the center axis of the blower pipe, 20 it is achieved that the axial blower will otherwise take up even less space.

Dette er specielt fordelagtigt, hvis de to steder, hvor tragten er afskåret, er placeret diametralt overfor hinanden, idet aksialblæseren dermed kan monteres direkte under f.eks. et loft, uden at rage væsentligt ned i det rum, hvori 25 den er monteret.This is particularly advantageous if the two locations where the hopper is cut off are located diametrically opposite each other, since the axial blower can thus be mounted directly under e.g. a ceiling, without projecting substantially into the space in which it is mounted.

Ved en foretrukken udførelsesform, som giver den mindste mulige byggehøjde alt andet lige, er tragten afskåret således, at dens ydre periferi, der hvor den er afskåret, i det mindste delvist ligger i et plan, der i hovedsagen svarer 30 til et tangentplan for den ydre diameter på det cirkulærcylindriske blæserrør.In a preferred embodiment, which gives the smallest possible building height all else equal, the hopper is cut so that its outer periphery, where it is cut off, lies at least partially in a plane substantially corresponding to a tangent plane of the outer diameter of the circular cylindrical fan tube.

3 DK 177428 B1 Såfremt aksialblæseren skal monteres direkte på en væg eller under et loft, er det fordelagtigt, såfremt der til tragtens ydre periferi, der hvor den er afskåret, er fastgjort et monteringsbeslag omfattende en pladedel, der strækker sig 5 i hovedsagen i tangentplanet for den ydre diameter på det cirkulærcylindriske blæserrør, og hvor monteringsbeslaget er forsynet med et antal huller indrettet med henblik på indføring af monteringsskruer. På denne måde opnås, at beslaget kan fastgøres meget stabilt til blæserrøret og tragten uden væsentlig anvendelse af forstærkningsdeie.3 DK 177428 B1 If the axial fan is to be mounted directly on a wall or under a ceiling, it is advantageous if a mounting bracket comprising a plate portion extending 5 substantially in the tangent plane is attached to the outer periphery of the hopper, where it is cut off. for the outer diameter of the circular cylindrical fan tube, and wherein the mounting bracket is provided with a plurality of holes arranged for insertion of mounting screws. In this way, it is achieved that the bracket can be attached very stably to the blower tube and the hopper without substantial application of reinforcing dough.

10 I en foretrukken udførelsesform for opfindelsen er der ved i det mindste ét af de steder, hvor tragten er afskåret, indrettet en materialeoverflade, som afgrænser aksialblæserens strømningsareal på tværs af strømningsretningen i aksialblæseren, og som strækker sig fra den forreste ende og bagud på in- 15 dersiden af tragten og et stykke ind i blæserrøret, hvilken materialeoverflade på det forreste stykke reducerer strømningsarealet, og på det sidste stykke øger strømningsarealet, indtil materialeoverfladen slutter, hvorved strømningsarealet svarer til strømningsarealet i blæserrøret.In a preferred embodiment of the invention, at least one of the locations where the hopper is cut off, a material surface is defined which defines the flow area of the axial blower across the flow direction in the axial blower and extends from the front end and rearwardly into the - the outside of the hopper and a piece into the blower tube, which material surface on the front piece reduces the flow area, and on the last piece the flow area increases until the material surface ends, whereby the flow area corresponds to the flow area in the blower tube.

20 Specielt i situationer, hvor aksialblæseren ikke skal monteres direkte mod et loft eller en væg eller en anden plan flade, vil det være fordelagtigt, såfremt der er indrettet en materialeoverflade ved begge steder, hvor tragten er afskåret, og hvor de to materialeoverflader i hovedsagen er udformet symmetrisk omkring blæserrørets centerakse.Especially in situations where the axial blower is not to be mounted directly against a ceiling or wall or other flat surface, it will be advantageous if a material surface is arranged at both locations where the hopper is cut off and where the two material surfaces are substantially is designed symmetrically around the center axis of the blower tube.

2525

Materialeoverfladen er fordelagtigt dannet af en indsats, som i hovedsagen udgøres af et i forhold til blæserrøret og tragten separat element, der er fastgjort på indersiden af tragten og blæserrøret ved svejsning, limning, nitning, eller ved hjælp af en anden fastgørelsesmetode. Derved opnås det, at en 30 stor del af aksialblæseren kan bygges op af standardkomponeneter, hvoref- 4 DK 177428 B1 ter der kan monteres en eller to indsatser afhængigt af behov, og som eventuelt kan være optimeret til specifikke forhold I denne sammenhæng er det specielt fordelagtigt, såfremt indsatsen er ud-5 formet af et støbt materiale, såsom formplast. Hvis der er krav til, at aksial-blæseren skal kunne modstå høje temperaturer, kan indsatsen eller indsatsene være fremstillet af metal eller lignende.Advantageously, the material surface is formed by an insert, which is essentially a separate element relative to the blower tube and the hopper, which is secured to the inside of the hopper and blower tube by welding, gluing, riveting, or by another attachment method. Thereby it is achieved that a large part of the axial blower can be built up of standard components, whereby one or two inserts can be mounted according to need, and which may be optimized for specific conditions In this context, it is special advantageously if the insert is formed of a molded material such as plastic. If the axial blower is required to withstand high temperatures, the insert or inserts may be made of metal or the like.

Aksialblæseren kan endvidere omfatte en diffuser ved aksialblæserens ba-10 geste ende ved blæserrørets udstødningsside, og denne diffuser kan fordelagtigt være udformet således, at den har en indre overflade, der divergerer fra blæserrørets indre diameter og bagud, og hvor diffuseren er afskåret helt eller delvist på i det mindste én side af aksialblæseren, således at diffuseren, set fra blæserrørets centerakse, er mindre på denne side end på andre sider.The axial blower may further comprise a diffuser at the rear end of the axial blower at the exhaust side of the blower tube, and this diffuser may advantageously be designed to have an inner surface that diverges from the inside diameter of the blower tube to the rear and the diffuser is cut off completely or partially. on at least one side of the axial fan, so that the diffuser, seen from the center axis of the fan tube, is smaller on this side than on other sides.

15 Herved opnås der på samme måde som ved aksialblæserens sugeside, at diffuseren ikke optager plads der, hvor den er afskåret.15 This is achieved in the same way as at the suction side of the axial fan, that the diffuser does not take up space where it is cut off.

På samme måde som ved tragten kan diffuseren fordelagtigt være afskåret på to sider i forhold til blæserrørets centerakse, og derudover kan der opnås 20 tilsvarende fordele som ved tragten, hvad angår udformning og placering af de afskårne sider på diffuseren, udformning og placering af materialeoverfla-den/indsatsen og udformning og indretning af monteringsbeslag efter samme princip som ved tragten.Similarly to the hopper, the diffuser may advantageously be cut on two sides relative to the center axis of the blower tube, and in addition, 20 similar advantages can be obtained as with the hopper in designing and positioning the cut sides of the diffuser, shaping and positioning of the material surface. the insert and the design and arrangement of mounting brackets according to the same principle as the hopper.

25 I forbindelse med diffuseren vil det dog være fordelagtigt, specielt i situationer, hvor aksialblæseren skal monteres tæt mod en plan overflade, såsom et loft eller en væg, at de to materialeoverflader i er udformet forskelligt, på en sådan måde at de bevirker, at luftstrømmen i udstødningssiden afbøjes i en retning bort fra monteringsbeslaget.In connection with the diffuser, however, it will be advantageous, especially in situations where the axial fan must be mounted tightly against a flat surface, such as a ceiling or wall, that the two material surfaces in are designed differently, in such a way that they the air flow in the exhaust side is deflected in a direction away from the mounting bracket.

30 5 DK 177428 B130 5 DK 177428 B1

Opfindelsen er især hensigtsmæssig i forbindelse med anbringelse af aksial-blæseren tæt ved et loft eller en væg, men aksialblæseren kan selvfølgelig også anbringes et sted på en væg, hvor aksialblæseren ikke sidder tæt op ad et loft eller en væg.The invention is particularly useful in connection with placing the axial fan close to a ceiling or wall, but of course the axial fan can also be placed on a wall where the axial fan does not sit close to a ceiling or wall.

5 FIGURFORTEGNELSE5 FIGURE LIST

Fig. 1: er en perspektivisk afbildning af en aksialblæser ifølge den foreliggende opfindelse, set skråt ovenfra.FIG. Figure 1 is a perspective view of an axial blower of the present invention as seen from above.

Fig. 2: viser den på fig. 1 viste aksialblæser set lige fra forfra fra sugesiden.FIG. 2: shows that in FIG. 1 is a front view from the suction side.

1010

Fig. 3: viser den på fig. 1 viste aksialblæser set lige bagfra fra udstødningssiden.FIG. 3: shows that in FIG. 1 from the exhaust side as seen from the rear.

Fig. 4: er en perspektivisk afbildning af aksialblæseren ifølge fig. 1 set skråt 15 ovenfra og i et snit gennem aksialblæseren langs med linjen C-C som vist på fig. 2.FIG. 4: is a perspective view of the axial blower of FIG. 1 is an oblique view from above in section through the axial fan along the line C-C as shown in FIG. 2nd

Fig. 5: Er en snitafbildning af aksialblæseren ifølge fig. 1 set fra siden af aksialblæseren langs med snittet C-C som vist på fig. 2.FIG. 5 is a sectional view of the axial blower of FIG. 1 is a side view of the axial fan along the section C-C as shown in FIG. 2nd

20 UDFØRELSESFORM FOR OPFINDELSENEMBODIMENT OF THE INVENTION

På figurerne ses således en aksialblæser 1 ifølge den foreliggende opfindelse, hvilken aksialblæser 1 omfatter et cirkulærcylindrisk blæserrør 2, hvor der er indrettet en blæserrotor 11 med vinger 12, hvilken blæserrotor 11 bringes til at rotere om sin aksel ved hjælp af en elektromotor 13, som på kendt vis er 25 fastgjort inde i blæserrøret 2 f.eks. ved hjælp af et antal ledeflader 14.Thus, the figures show an axial blower 1 according to the present invention, which axial blower 1 comprises a circular cylindrical blower tube 2, which is arranged with a blower rotor 11 with wings 12, which blower rotor 11 is caused to rotate about its shaft by an electric motor 13 which in known manner, 25 is secured within the blower tube 2 e.g. using a plurality of guides 14.

6 DK 177428 B16 DK 177428 B1

Ved den ene ende på blæserrøret 2, som udgør sugesiden på aksialblæse-ren 1, er der indrettet en tragt 3, som bevirker, at luften, som suges ind i ak-sialblæseren, så vidt muligt strømmer ind i denne uden væsentlig turbulens og deraf følgende øget støjniveau og tab af virkningsgrad. På samme måde 5 er der ved den anden ende på blæserrøret 2, som udgør udstødningssiden på aksialblæseren 1, indrettet en diffuser 4, med det samme formål som ved tragten 3. Diffuseren 4 er ikke altid nødvendig at anvende, men i den viste udførelsesform er den med.At one end of the blower pipe 2, which forms the suction side of the axial blower 1, a funnel 3 is arranged which causes the air which is sucked into the axial blower to flow as far as possible without substantial turbulence and hence following increased noise levels and loss of efficiency. Similarly 5, a diffuser 4 is provided at the other end of the blower tube 2, which forms the exhaust side of the axial blower 1, for the same purpose as the hopper 3. The diffuser 4 is not always necessary to use, but in the embodiment shown, the one with.

10 Som det ses på figurerne, og specielt på figur 2 og 3, er både tragten 3 og diffuseren 4 ifølge opfindelsens princip afskåret to steder, som er diametralt modsat hinanden i forhold til aksialblæserens 1 centerakse. Derved vil aksialblæseren ifølge opfindelsen kunne indbygges i et rum med begrænset plads, uden at dette forudsætter, at hele aksialblæseren 1 og specielt blæ-15 serrotoren 11 skal dimensioneres ned. På den ene side, hvor tragten 3 og diffuseren 4 er afskåret, er der indrettet monteringsbeslag 5, 6, som er forsynet med huller for optagelse af monteringsskruer, og som den/ed muliggør, at aksialblæseren 1 kan monteres direkte op ad en plan flade, såsom en væg eller et loft, og derved vil aksialblæseren rage minimalt ud fra væggen eller 20 loftet, set i forhold til den plads, som blæserotoren 11 kræver for at kunne rotere.10 As can be seen in the figures, and especially in Figures 2 and 3, both the hopper 3 and the diffuser 4 according to the principle of the invention are cut in two places which are diametrically opposed to each other relative to the center axis of the axial fan 1. In this way, the axial blower according to the invention can be built into a space with limited space without the need for the entire axial blower 1 and especially the blower rotor 11 to be dimensioned down. On one side, where the hopper 3 and the diffuser 4 are cut off, mounting brackets 5, 6 are provided, which are provided with holes for mounting mounting screws, and which enable the axial fan 1 to be mounted directly on a flat surface , such as a wall or ceiling, and thereby the axial fan will project minimally from the wall or ceiling relative to the space required by the blower rotor 11 to rotate.

For at reducere turbulens i sugesiden på aksialblæseren 1 ved tragten 3 er der monteret indsatser 7, 8, som i strømningsretningen først indsnævrer 25 strømningsarealet gennem aksialblæseren på tværs af dens centerakse og derefter udvider dette strømningsareal indtil indsatsen slutter, hvorved strømningsarealet svarer til strømningsarealet omkring blæserrotoren 11.In order to reduce turbulence in the suction side of the axial fan 1 at the hopper 3, inserts 7, 8 are mounted which in the flow direction first narrow the flow area through the axial blower across its center axis and then extend this flow area until the insert ends, whereby the flow area corresponds to the flow area around the fan rotor. 11th

Dette bevirker, at turbulens i sugesiden ved tragten 3 og ind i blæserrøret 2, 30 kan reduceres væsentligt, uden at dette medfører væsentligt tab af virkningsgrad, og på samme tid reduceres lydniveauet.This means that turbulence in the suction side at the hopper 3 and into the blower tube 2, 30 can be substantially reduced without causing significant loss of efficiency, and at the same time the noise level is reduced.

7 DK 177428 B1 Såfremt aksialblæseren 1 er monteret direkte mod en væg ved hjælp af monteringsbeslagene 5, 6, kan indsatsen 7, ved den side, hvor monteringsbeslaget 5 er placeret, udelades. Dette skyldes, at indsatsens effekt ikke vil være 5 stor i denne situation.7 DK 177428 B1 If the axial fan 1 is mounted directly against a wall by means of the mounting brackets 5, 6, the insert 7, at the side where the mounting bracket 5 is located, can be omitted. This is because the effect of the effort will not be large in this situation.

Ved udstødningssiden, hvor diffuseren 4 er anbragt, er der ligeledes indrettet indsatser 9, 10 der, hvor diffuseren 4 er afskåret. Disse indsatsers 9,10 funktion er primært at afbøje den luftstrøm, der blæses ud af aksialblæseren 1, 10 og derfor er de ikke udformet ens, idet den indsats 9, der er indrettet ved monteringsbeslaget 6, har en relativt plan materialeoverflade, som former en rampe i forhold til indersiden af blæserrøret 2, og den diametralt modsat placerede indsats 10 har en afrundet materialeoverflade, som virker som oversiden på en vinge, hvormed den skaber et relativt undertryk. Derved vil luft-15 strømmen, som kommer ud af aksialblæseren 1 som vist på figurerne, blive rettet væk fra monteringsbeslaget 6 ved diffuserenAlso, at the exhaust side where the diffuser 4 is arranged, inserts 9, 10 are provided where the diffuser 4 is cut off. The function of these inserts 9,10 is primarily to deflect the air flow blowing out of the axial blower 1, 10 and therefore they are not designed in the same way, the inserts 9 arranged at the mounting bracket 6 having a relatively flat material surface which forms a ramp relative to the inside of the blower tube 2, and the diametrically opposed insert 10 has a rounded material surface which acts as the upper surface of a blade, thereby creating a relative negative pressure. Thereby, the air flow coming out of the axial fan 1 as shown in the figures will be directed away from the mounting bracket 6 by the diffuser

Disse indsatser 9,10 ved diffuseren 4 kan i øvrigt anvendes i alle former for aksialblæsere med det samme formål for øje, uanset om disse blæsere er af 20 den kendte type, hvor tragt og diffuser ikke er afskåret på den måde som defineret ved den foreliggende opfindelse.Moreover, these inserts 9,10 at the diffuser 4 can be used in all types of axial fans for the same purpose, whether or not these fans are of the known type, where the hopper and diffuser are not cut in the manner defined by the present invention. invention.

Indsatserne 7, 8, 9, 10 er udført i et materiale, der kan støbes, såsom plast, og derefter er de monteret på kendt vis til indersiden på tragten 3 eller diffu-25 seren 4 og blæserrøret 2. Hvis der er krav til, at aksialblæseren 1 skal kunne modstå høje temperaturer, kan indsatsene 7, 8, 9, 10 være fremstillet af metal eller lignende.The inserts 7, 8, 9, 10 are made of a moldable material such as plastic, and then they are mounted in known manner to the inside of the hopper 3 or the diffuser 4 and the blower tube 2. If required, for the axial blower 1 to withstand high temperatures, the inserts 7, 8, 9, 10 may be made of metal or the like.

I en udførelsesform for aksialblæseren 1 kan denne være reverserbar, såle-30 des at omløbsretningen på blæserrotoren 11 kan vendes, og luftstrømmen kan blæses den modsatte vej.In one embodiment of the axial blower 1, this can be reversible so that the direction of rotation of the blower rotor 11 can be reversed and the air flow can be blown the opposite way.

Claims

An axial blower comprising a generally circular cylindrical blower having an inner and an outer diameter and wherein in the blower tube is provided a blower rotor, said blower rotor having a rotor shaft substantially coinciding with the center axis of the circular cylindrical blowing tube and the blower rotor has an outer diameter which is slightly smaller than the inside diameter of the blower tube and is arranged so that the blower tube at a front end, seen in the flow direction of the air operated through the axial blower 10, has a suction side, and in its the opposite rear end has an exhaust side for air, and where at the suction side of the blower tube in front of the circular cylindrical blower is arranged a funnel with an inner surface which converges towards the inner diameter of the blower at least one side of the axial blower, so that the outer edge of the hopper , seen from the center of the blower tube, is smaller on this side than on other sides.

Axial blower according to claim 1, characterized in that the hopper is cut off on two sides relative to the center axis of the blower tube. 20

Axial blower according to claim 2, characterized in that the two places where the hopper is cut off are located diametrically opposite each other.

Axial blower according to claim 1,2 or 3, characterized in that the hopper is cut so that its outer periphery, where it is cut off, lies at least partially in a plane substantially corresponding to a tangent plane of the hopper. outer diameter of the circular cylindrical fan tube.

Axial blower according to claim 4, characterized in that the outer periphery of the hopper, where it is cut off, is attached a mounting bracket comprising a plate part extending substantially in the tangent plane of the outer slide 2 circular cylindrical blower pipes, and wherein the mounting bracket is provided with a plurality of holes arranged for insertion of mounting screws.

Axial blower according to one or more of the preceding claims, characterized in that at least one of the places where the hopper is cut off, a material surface is defined which defines the flow area of the axial blower across the flow direction in the axial blower and which extends from the front end and backward on the inside of the hopper and a piece into the blower tube, which material surface on the front piece reduces the flow area, and on the last piece the flow area increases until the material surface ends, whereby the flow area corresponds to the flow area in the blower tube.

Axial blower according to claims 2 and 6, characterized in that a material surface is arranged at both places where the hopper is cut off and where the two material surfaces are substantially symmetrically arranged around the center axis of the blower tube.

Axial blower according to claim 6 or 7, characterized in that the material surface ends before it reaches the blower rotor inside the blower tube.

Axial blower according to one or more of claims 6 to 8, characterized in that the material surface is formed by an insert, which is essentially a separate element relative to the blower tube and the hopper, which is fixed to the inside of the hopper and the blower tube by welding, bonding, riveting, or by any other attachment method.

Axial blower according to claim 9, characterized in that the insert is formed of a molded material such as plastic. 3 DK 177428 B1

An axial blower according to one or more of the preceding claims, characterized in that a funnel is formed at the rear end of the blower tube at its rear end, and behind the circular cylindrical blower tube, in relation to the flow direction during operation. air flowing through the axial blower during operation, the diffuser having an inner surface that diverges from the inner diameter of the blower tube and backward, the diffuser being cut off in whole or in part on at least one side of the axial blower, so that the diffuser blower center axis, is smaller on this side than on other sides. 10

Axial blower according to claim 11, characterized in that the diffuser is cut off on two sides with respect to the center axis of the blower tube.

Axial blower according to claim 12, characterized in that the two locations where the diffuser is cut off are located diametrically opposite each other.

Axial blower according to claim 11, 12 or 13, characterized in that the diffuser is cut off so that its outer periphery, where it is cut off, lies at least partially in a plane which corresponds substantially to a tangent plane of the diffuser. outer diameter of the circular cylindrical fan tube.

Axial blower according to claim 14, characterized in that a mounting bracket comprising a plate portion extending substantially in the tangent plane of the outer diameter of the circular cylindrical blower tube is affixed to the outer periphery of the diffuser. and wherein the mounting bracket is provided with a plurality of holes arranged for insertion of mounting screws.

Axial blower according to one or more of claims 11 to 15, characterized in that at least one of the places where the diffuser is cut off, a material surface is defined which defines the flow area of the axial blower across. of the flow direction in the axial blower extending from the rear end to the inside of the hopper and a portion into the blower tube, which material surface of the rear portion increases the flow area and, in the first section, seen in the flow direction, reduces the flow area .

Axial blower according to claims 12 and 16, characterized in that a material surface is arranged at both places where the hopper is cut off and wherein the two material surfaces are formed differently, in such a way that the air flow in the the exhaust side deflects in a direction away from the mounting bracket.

Axial blower according to claim 16 or 17, characterized in that the material surface begins after the blower rotor inside the blower tube. 15

Axial blower according to one or more of claims 16 to 18, characterized in that the material surface is formed by an insert, which is essentially a separate element relative to the blower tube and the hopper, which is secured to the inside of the hopper and the blower tube by welding. , gluing, riveting, 20 or by any other attachment method.

The axial blower according to claim 19, characterized in that the insert is formed of a molded material, such as plastic.