DE2021159A1 - Rotating pump with a silencer for gaseous flow media - Google Patents

Description

202115-3

Dipl.-Ing. Egon Prince _ Dr. Gertrud Hauser 2 7. Apfj'lΊ970 Pee. - Ing.Gottfried Leiser

Patent Attorneys -

MM HOiKhWi-Pasing Ernsbtrgaritraii 19

Our reference: E 691

cas J

ETUDES TEGHHIQUES. ET REPRESENTATIONS IFBUSTRIELLES '■ 8, rue Boutard, NBuilly-sur-Seine / France.

Rotating pump fitted with a silencer ± üf gaseous fluids.

The invention relates to a rotating,

in particular with vortex motion pump, which mainly is intended as a fan for air or another gaseous medium. The inventive pump has a by a paddle wheel or the like. formed rotor, which rotates within an annular channel, which it does not completely fill, so that the vortex movements of the air favors will. The pump also has a silencer arranged between the inlet and outlet ducts and the rotor on.

When used for pumping or conveying fluids (especially as a result of the strong pressures or suction effects achieved), the vortex pumps have

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interesting properties, but present certain difficulties.

First of all, they generate as they work

a considerable noise, so that they have to be provided with a silencer, which, however, is difficult to manufacture is because, when it is effective, it significantly degrades the performance of the pump.

Furthermore, in general, such

Pumps are difficult to use with low flow rates and high pressure due to the heating of the fluid. It is therefore there is a more or less extensive zone in which the pump cannot be used.

After all, it is important that this

Pumps have the smallest possible volume, which is difficult with an intricate bulky design of the silencer is compatible.

In a known embodiment, the

Silencer is provided in a ring around the drive motor. This solution has the advantage of a small footprint, since it makes the best use of the overall dimensions of the apparatus determined by the tubular ring containing the rotor will.

However, this design has several disadvantages:. -

The gaseous heated by the compression or the negative pressure and by the losses of the fan Fluid maintains a high temperature atmosphere over a significant portion of the engine. In addition, he takes Motor with its own losses participate in the heating of the fluid. These from the start-up of the device Occurring warming can now only stabilize after several hours, so that that of the fan in the steady state delivered pressure is reduced compared to that achieved with a cold apparatus * '

This disadvantage is exacerbated by the fact that in certain applications the pressure generated or Underpressure in certain upper and lower limits a pretty good must have exact value. This impermanence can cause the

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Force users to make frequent adjustments. Certain machines are provided with an adjustable capacitor for this purpose. With such fans it can happen that the (e.g. measured by the changes in the winding resistance) internal heating of the motor exceeds 100 C even if one outside of the above-mentioned forbidden zone of the operational core line remain. This requires a higher level of insulation and causes an accelerated wear of the rolling bearings through the smaller destruction of the grease, as this Apparatus in general must be lubricated once and for all.

In another known embodiment are connected to the inlet and outlet openings of the den Rotor containing annular housing, if necessary. With a sound-absorbing smock filled chambers combined, which in the axis of these openings parallel to the motor axis are arranged. However, such chambers have the disadvantage that they have a small volume when they are not supposed to take up excessive space so that they do not Allow attenuation of the noises in the entire frequency range.

The rotating pump according to the invention

with one combined with the annular housing of the rotor The silencer is intended to overcome the above disadvantages by largely attenuating the noise without noticeably increasing the space requirement remedy the housing of the pump.

The rotating according to the invention, in particular working with a vortex movement, mainly a fan for a gaseous fluid * forming pump,

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at which / with at least one of the openings for entry of the fluid is combined into the housing containing the rotor or the outlet therefrom, this silencer has a circulation chamber arranged between one of the connecting pieces of the pump and the opening of the housing, is characterized in that this chamber has at least one curvature of the flow circle of the gaseous fluid forcing labyrinth member, whereby a very substantial attenuation of the noise can be achieved.

The axis of the connecting piece of the sound

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damper is preferably perpendicular to the center plane zi of the curved flow circuit of the fluid in the chamber of the muffler, thereby reducing it again of the noise is achieved.

<In an advantageous embodiment

the invention is the housing of the motor outside the housing of the rotor, and the chambers of the acoustic damper lie in a third housing which is supported at the same time on the motor housing and on the rotor housing. Ber through this Arrangement of the motor and rotor resulting in free space for the installation of a silencer of suitable length exploited.

According to another embodiment of the

Invention, which incidentally can be combined with the preceding, the housing of the silencer has a removable Front wall which delimits the chambers of the silencer and is filled with a sound-absorbing agent on the inside can be*

The invention is explained below by way of example with reference to the drawing.

Pig. 1 is a perspective view, partially in section, of an inventive view from the rotor side gemässen vortex pump with breaking away of parts.

Fig. 2 is a corresponding to Pig · 1,

from the side of the auxiliary fan same pump.

Pig »3 is a section along the line III-III of FIG.

Fig. 4 is a section along the line IV-IV of Fig. 3 ..

Fig. 5 is a section of the muffler along the line V-V of FIG. 3.

Pig. 6 is a section on line VI-VI of Pig. 3.

Pig, 7 is a section corresponding to FIG. 5 of a variant embodiment.

8 and 9 are schematic diagrammatic

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Borrowed, Fig. 1 and 2 corresponding views of two Ausfühirungsabwandlungen part of the muffler.

Figs. 10 and 11 are a side view

and a small-scale end view of an embodiment modification of the pump, respectively.

Pig, 12 and 13 are corresponding views another design modification.

Pig. 14 and 15 are two operational diagrams. In Pig «1 to 6 the application of the invention is to a vortex pump for air or other fluid shown. Your motor 1 with its stator 2 is housed in a housing 3 through which an axially Wave 4 occurs, which at one end by a paddle wheel 6 formed rotor 5 of the pump carries. The rotor 5 rotates in an annular housing 7, which the housing 3 of the Motor 1 at the front end of the same surrounds a ring. That The housing 7, which forms an annular channel 8 with a semicircular cross-section opposite the blades 6, is supported by a rotor 5 including lid 9 completed.

On the side facing away from the rotor 5

the shaft 4 carries an impeller 11, which forms the fan of the motor 1 and is accommodated in an enveloping housing 12 with openings 13 open in the direction of the housing 7. ■ .- ■ '■

According to the invention with the above

Way trained pump combines a muffler 14, which housed in an approximately parallelepiped housing 15 which extends transversely to the axis of the engine 1 and tangentially to the housing 3 of the same and at the front the rear wall of the housing 7 is supported «

The muffler 14 is divided by a central partition l ^ into two chambers 16a, 16b which the inlet or the outlet of the fluid are assigned.

Each of the chambers 16a, 16b (hereinafter

generally designated 16) is in two channels 18, 19 through a wall 21 divided, which on the housing 15 of the

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The silencer 14 terminating removable end wall 22 is tapered. The wall 21 is interrupted at a certain distance from the wall 22, so that a labyrinth is created and the fluid is given a curved path F or »G, the center plane of which is practically parallel to the axis of the motor 4» This path connects at the chamber 16a UeR inlet stub 23a with the inlet opening 24a of the annular housing 8 and in the chamber 16b the outlet opening 24b of the housing with the outlet connection 23b,

In the version under consideration, the

Axes of the nozzle 23a, 23b parallel and approximately perpendicular to the curved paths F, @ · The housing 15 of the muffler and the End wall 22 are preferably made of a light metal formed in the mold and have a sound-absorbing inside coating 25 »z» B. made of felt or any other non-woven or pressed, natural or artificial material.

The muffler formed in this way proves to be very effective. Sr gives namely the Fluid stream filaments have a number of curvatures and Twists, which is very beneficial for sound absorption.

Furthermore, the housing of the muffler

serve as a base for the pump ₉ whose length expansion as well as the overall length © is not changed, which is very advantageous β The inner B © lay of the chambers 16 can have a considerable thickness _s in particular verm the pump should work with low delivery rate.

In the execution of the Mg. 7 therefore carries

the end wall 22 has a composite coating with an inner Felt layer 31 and an outer layer 32 made of synthetic foam while the other walls are covered with glued-on felt *, by changing the thickness of layer 32 one can see the value of the at the place of the labyrinth member 21 set the constriction E formed »

In the variant embodiment of FIG

the labyrinth element 33 extends to the (remotely imagined) End wall 22 which connects the channels 18, 19 producing constriction is here through a window formed between the stupid part of the housing 15 and this wall

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34 formed. These two versions already enable most of the for the flow rate, the pressure and that Noise to meet the desired parameters.

The execution of the pig. 9 is thereby

It is noteworthy that the channels 16, 19 are tubular and are united in the vicinity of the wall 22 by a window 35 delimited by a projection 36 of a certain height. This design creates a lower pressure drop than the previous ones with the same noise absorption. Furthermore, with a suitable tool, the entire silencer 15 can be produced, in particular by molding in the mold. It can consist directly of a sound-absorbing material.

The position of the connecting pieces 23a, 23b opposite | The flow circuits of the chambers 16 can of course be geniäsa as required to be changed.

Thus, in Fig. 10, 11 the connecting pieces 23c,

23d arranged on the side walls of the housing 15. However, since Often only a single nozzle is used, the housing 15 only needs to have one nozzle, as at 23e in Fig. 12 and 13 shown.

14 shows the characteristics of the pressure P.

and the internal heating T of the motor as a function of the flow rate D. The forbidden zone Z present in such fans is traced back to Z by the invention. improves the | The stability of these characteristics is considerable. The limit point ^ ₁ *, which is 100 ° C in a known fan, is only 35 ° C in a design according to the invention with a smaller delivery rate. This improves the pressure characteristic even further, as shown in FIG. 15 (characteristic P / D) , in which the curve P ₁ corresponds to working in a cold state and P «to working in a warm state. As you can see, it is expedient to work at the lowest possible temperature, which is made possible by the invention.

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Claims (8)

Claims 1.) 'Rotating, especially with a Vortex motion pump designed primarily for use as a fan for gaseous fluids, in which a silencer with at least one of the openings for the entry of the fluid into the rotor containing housing or the outlet from the same is combined, this silencer between a the connection piece of the pump and the relevant opening of the housing has a circulation chamber, characterized in that that this chamber (16a or 16b) has at least one curvature of the S-flow circle of the gaseous fluid has forcing labyrinth member (21). 2 ») Pump according to claim 1, characterized in that the axis of the connecting piece (23a or 23b) of the Silencer (14) approximately perpendicular to the center plane of the curved flow circle (F, G) of the fluid in the chamber (16) of the muffler (14) is located. 3 _S ) pump according to claim 1, wherein the The housing of the motor lies outside the housing of the rotor, characterized in that the chambers (16a, 16b) of the muffler (14) in a housing (15) supported simultaneously on the motor housing (3) and on the rotor housing (7) are housed. 4.) Pump according to claim 3, characterized in that the housing (15) of the silencer (14) one delimiting the chambers (16a, 16b) of the muffler has removable end wall (22) which is covered on the inside with a sound-absorbing material. 5.) Pump according to claim 1, characterized in that the chamber (16a, 16b) of the silencer (14) connected to each opening (24a, 24b) of the rotor housing has two channels (18 ₉ 19) separated by a labyrinth element (21) which run approximately parallel to the axis of the motor. 6 «,) Pump according to claim 1, characterized in that that the axis of each opening (24a, 24b) 009887/1307 of the housing (7) of the rotor (5) approximately perpendicular to the center plane of the flow circle (F, G) of the fluid in the Chamber (16) of the silencer (14) is located. 7.) Pump according to claim 1, characterized in that the housing (15) of the silencer (14) forms a base for the motor housing (3). 8.) Pump according to claim 7, characterized in that the nozzle (13a, 13b) of the silencer (14) in the spaces left between the housings (3 or 7 or 15) of the motor or the rotor or the silencer are housed. 9 «) Pump according to claim 7, characterized in that that the nozzle (23c, 23d) of the silencer arranged on the sides of the housing (15) of the muffler are. 009887/1307