DE102013017422A1 - Fan - Google Patents

Abstract

A fan (1) with flexible funnels (10) or (11), which can be pivoted about the axis (2), can be applied in a plane-sealing manner on a wall (7) during conveyance. Free space for pivoting arises with the distance (4), which is variable by means of lifting drive (15) via parallel joints (5), (6) on which the pivot drive (3) sits. As a result of the parallel movement frictional wear is advantageously prevented at the sealing points. Also, structural tolerances due to the flexible and planned sealing can be compensated. In the hopper (11) can advantageously install a two-point controller (40) for the amount of air.

Description

The present invention relates in the preamble to a pivoting fan for regenerative heat recovery during ventilation.

Air is alternately conveyed in both directions by an immobile heat storage, to which the entire fan is pivoted periodically about an axis transverse to the flow by about 180 degrees.

Here, sealing against leakage flow and the equality of the periodically reciprocating air flow should be sought so that the degree of heat recovery is optimal even with fluctuating wind pressure.

From the DE-41 15 710 A1 is a swivel fan known.

Shown is there in 3 a fan 40 , which can be seen with air gap in a shaft 11 is pivotally mounted.

With regard to the dimensional tolerances of the shaft cross-section, the fan housing and the pivot bearing, the air gap must have a minimum size for the purpose of smooth pivoting, which leads disadvantageously to significant leakage.

Shown is also in 4 and 5 a barrier layer 46 for sealing, the latter by oblique, rubbing the edges of the fan housing to the barrier layer 46 arises.

Adversely, this results in increased wear and stiffness when panning.

In addition, formed as a result of multiple edges and the pivoting of far less than 180 degrees air turbulence, which reduce the efficiency of the fan and amplify the running noise.

The DE-833 78772 U1 shows a radial fan which is pivotable about an axis transverse to the flow. Here, in each case the suction side against the pressure side by flexible sealing lips "Ringlippe" 31 ' sealed at an inlet nozzle 34 issue.

The sealing lips are bent at every turn and dragged over the inlet nozzle. Since in normal operation of the heat recovery due to the here rotating heat storage is not very frequent swinging, but only occasionally when switching z. B. summer operation, a longer life of the sealing lips is to be expected in this embodiment.

In an immobile heat storage and correspondingly very frequent swivels of the fan, the sealing lips would wear out disadvantageously fast.

The object of the invention is to make a fan for regenerative heat recovery with a stationary heat storage such that with a simple design a long-term, reliable and effective operation is achieved.

This object is solved by the features of the main claim.

The inventors started from the idea of performing pivoting and sealing as two separate operations, thus preventing friction and wear at the sealing point.

It was recognized that the thus somewhat greater effort due to two drives and the additional construction volume of the overall achievable benefits is more than offset.

In the dependent claims advantageous embodiments and details are explained, which relate to the design of the devices for pivoting and sealing and the control of the amount of air.

Based on the following 1 to 5 the invention will be explained in more detail.

It show schematically, partially cut:

1 the top view of an axial fan with lifting and pivoting devices

2 the side view of 1 transverse to the flow with lifted axial fan

3 the side view of a tight-fitting radial fan

4 the side view of a only swiveling fan with perforated disc for lifting

5 a two-position controller for regulating the amount of air

In a first embodiment is in 1 and 2 an axial fan 1 around a pivot axis 2 stored on two diametrically opposite sides.

One of the bearings can directly as a rotary actuator 3 be executed.

The bearings are made of parallel joints 5 and 6 carried by which the fan 1 according to size and direction of the double arrow 4 as a hub 4 is mobile. This provides enough space for panning (as in 2 shown) and a nearly vertical movement of the fan 1 to a flat wall 7 for sealing around an air passage 71 around possible.

Thus, sliding with fretting at the sealing points is significantly reduced in a particularly advantageous manner.

Also, there may be some coaxial dimensional tolerances between fans 1 and air outlet 71 are allowed, which only slightly disturb the sealing effect and simplify the production.

An attack 9 on the fan 1 limits pivoting to 180 degrees when applied to one on the parallel link 5 sitting outrigger 8th ,

The funnels 10 . 11 , to the fan 1 attached, are flexible elastic, so that they are also at some deviation of the fan 1 from the parallel position to the wall 7 Seal with little pressure on its entire circumference.

At the parallel joints 5 . 6 sit lever 12 . 13 , rigid over a torsionally stiff rod 14 are interconnected so that the movement at both joints is the same, reducing the location of the pivot axis 2 parallel to the wall 7 is secured.

A lifting drive 15 moves the parallel joints 5 . 6 by crank 16 and rod 17 , where the hub 4 through a stop 18 is fixed.

An attack 19 stops the further movement of the crank 16 when the funnels 10 or 11 on the wall 7 issue.

This form crank 16 and rod 17 almost a common line with the action of a toggle lever, so that the force for application increases significantly and thereby advantageously occurs a self-locking.

Preferably, the pivot axis 2 vertically aligned, wherein the lifting movement in a horizontal plane runs. As a result, restoring forces and moments due to gravity are avoided, so that the rotary actuator 3 and the linear actuator 15 have to do far less.

For this reason, and because of the aforementioned increase in force while avoiding elaborate limit switch both drives 3 and 15 controlled only by timers.

3 shows a radial fan 20 , which is pivotable and movable in reference to 1 and 2 can be arranged with the details described there.

Flexible funnels 21 . 22 serve here for sealing on the wall 24 ,

As an alternative shows 4 a non-displaceable axial fan 30 with the pivot axis 31 ,

First, the fan is located on a perforated disc 32 on which wall 33 tightly seated. With the perforated disc removed 32 (shown in dashed lines) is clearance with the hub 34 to pan. For this purpose, similar devices as described in 1 and 2 be used, for. B. parallel joints 5 . 6 for guiding perforated disc 32 ,

It is recognizable that the perforated disc 32 must seal at two coaxial circumferential points. For rigid and flat design, the perforated disc seals 32 on the wall 33 sufficiently from, as well as the flexible funnels 10 and 11 ,

Because the fan 30 is not moved, this can also accommodate large pressure differences without yielding.

On a device for moving the perforated disc 32 , such as B. a parallel joint 5 . 6 (Sat. 1 and 2 ), therefore acts as a load only the pressure difference on the disk surface, which advantageously makes up a fraction of the end face of the fan.

The radial fan 20 in 3 can also be based on 4 arrange (not shown).

It settles in the area of the funnel 10 or 11 respectively. 22 detect the flow rate reproducibly and use it to regulate the amount of air.

Particularly simple and reliable is a known two-step controller 40 in 5 in which a leaf spring 41 from the dynamic pressure of the air flow in the direction of the arrow 42 is charged.

The back pressure acts as a set point in the direction of the arrow for a restoring force 43 opposite. As soon as the dynamic pressure predominates, the bending causes the leaf spring 41 a switching signal by means of a scan 44 , z. As a light barrier to reduce the drive power of the fan or the opening of a throttle valve (the necessary, known means are not shown).

In accordance with the resulting drop in dynamic pressure, the leaf spring bends 41 back, so that the drive power increases or the throttle opens further.

The process takes place periodically, for a sufficiently high switching frequency, the leaf spring 41 should respond as low as possible.

The restoring force as setpoint can be inventively advantageous with a magnetic coil 45 generate whose current is given. This is the leaf spring 41 with a thin, soft magnetic pole surface 46 Mistake.

This has an air gap 47 to the opposite pole of the solenoid 45 , which is at least ten times the deflection of the leaf spring 41 between the attacks 48 and 49 is.

As a result, in the case of a given coil current, the field line profile changes only slightly during deflection, so that the restoring force is essentially determined by the coil current.

The thin pole surface 46 has a low mass, so that the leaf spring responds with little inertia. In contrast, a known plunger coil requires considerably more mass and higher construction costs.

In the fan 1 . 20 . 30 sits the two-position controller 40 and is swiveled so that it must be designed and connected in a particularly simple manner only for one direction of flow (in 2 . 3 and 4 shown in dashed lines).

LIST OF REFERENCE NUMBERS

1

Axial

2

swivel axis

3

Rotary actuator

4

stroke

5

parallel link

6

parallel link

7

wall

71

Air passage

8th

boom

9

attack

10

funnel

11

funnel

12

lever

13

lever

14

Rod

15

Linear actuator

16

crank

17

pole

18

attack

19

attack

20

radial fans

21

funnel

22

funnel

23

wall

30

Axial

31

swivel axis

32

perforated disc

33

wall

34

distance

40

Two Punk regulator

41

leaf spring

42

arrow

43

arrow

44

Wegabtastung

45

solenoid

46

pole

47

air gap

48

attack

49

attack

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4115710 A1 [0004]
• DE 83378772 U1 [0010]

Claims (10)

Fan with device for alternately conveying air in both directions, for which the fan is pivotable about an axis transverse to the conveying direction by approximately 180 degrees, characterized in that a) the fan ( 1 ) 20 ) 30 ) with its pressure or suction funnels ( 10 ) 11 ) 21 ) 22 ) when conveyed on walls ( 7 ) 23 ) or on a perforated disc ( 32 ) substantially flush sealing. b) the fan ( 1 ) 20 ) 30 ) at non-funding distance ( 4 ) 34 ) to the walls ( 7 ) 23 ) or the perforated disc ( 32 ) in order to have free space for panning. c) a pivoting drive ( 3 ) and a linear actuator ( 15 ) for changing the distance ( 4 ) 34 ) are provided. Fan according to claim 1, characterized in that a fan ( 1 ) 20 ) for changing the distance ( 4 ) to the wall ( 7 ) is movable back and forth. Fan according to claim 1, characterized in that a perforated disc ( 32 ) for changing the distance ( 34 ) to the wall ( 33 ) and the fan ( 30 ) is movable back and forth. Fan according to claims 1 to 3, characterized in that the perforated disc ( 32 ) or the fan ( 1 ) 20 ) together with swivel drive ( 3 ) by parallel joints ( 5 ) 6 ). Fan according to claims 1 to 4, characterized in that the movement of each two parallel joints ( 5 ) 6 ) by a torsionally stiff rod ( 14 ) is synchronized. Fan according to claims 1 to 5, characterized in that stops ( 18 ) 19 ), () the maximum distance ( 4 ) 34 ) and a stop ( 9 ) limit the pivoting to about 180 degrees. Fan according to claims 1 to 6, characterized in that the pivot axis ( 2 ) vertically and the lifting are aligned in a horizontal plane. Fan according to claims 1 to 7, characterized in that at the funnel ( 10 ) or ( 11 ) respectively. ( 22 ) a two-position controller ( 40 ) to regulate the amount of air befinded, which is swung and the acted upon by a dynamic pressure leaf spring ( 41 ), wherein the setpoint of the amount of air with the current of a magnetic coil ( 45 ) as restoring force against the back pressure of the leaf spring ( 41 ) is given. Fan according to claims 1 to 8, characterized in that a soft magnetic pole ( 46 ) an air gap ( 47 ) to the opposite pole of the magnetic coil ( 45 ), the air gap ( 47 ) At least ten times the deflection of the leaf spring ( 41 ) between the attacks ( 48 ) and ( 49 ) is. Fan according to claims 1 to 9, characterized in that for controlling the amount of air, the speed of the fan ( 1 ) 20 ) 30 ) and / or the opening of a seated in the air flow throttle body is changed.

Images