FI70635C - FLAEKTORGAN AVSEDD FOER INLOPPS- ELLER UTLOPPSLUFTKANALER I VETILATIONSANLAEGGNINGAR - Google Patents

Description

rm «, ν ADVERTISEMENT n n s Ύ r [B] (11) UTLÄGGNINGSSKRIFT / 06 35 99 / PA? C (45) Pciteatti granted, (Patent meJOciat 24 03 I960 (51) Ky.lk.7lnt.CI. * F 24 F 11/04 g | jQ | ^ | j_p || ^^^ | ^ Q (21) Patent application - Patentansökning 773373 (22) Application date - Ansöknlngsdag 10.11 .77 (Fl) (23) Starting date - Glltlghetsdag 10.11.77 (41) Has become public - Blivlt offendIg 11.05.79

National Board of Patents and Registration of Finland Date of publication of the publication

Patent and registration authorities '' Ansökan utlagd och ud.skriften publicerad (86) Kv. application —Int. ansökan (32) (33) (31) Privilege requested - Begärd priority (71) Haiton Oy, 47400 Kausala, Finland-Finland (FI) (72) Erkki Aalto, Kausala, Arvi Tolmunen, Kausala, Finland-Finland (FI) ( 74) Forss £ n S Salomaa Oy (54) Blower for air supply or exhaust air ducts - Fläktorgan avsedd för inlopps- eller utloppsiuft-kanaler i ventilationsanläggningar

The invention relates to a blowing member for supply or exhaust air ducts, comprising a jacketed rectangular flow duct, a control element arranged in the reference duct and a control device by means of which the throttle can be adjusted difference.

for adjusting the volume flow of mucus passing through the supply and firing conditions of the airs. several different devices are used in the immediate vicinity of the organs. The simplest and most common solutions used in rectangular flow channels are sliding perforated plates, pivoting flaps or pivoting controls.

A combination comprising an air volume flow regulator and an injection or exhaust member, which combination is also called a terminal member, is generally desired to e.g. the following features: 2 70635 air volume flow control should be easy to perform through the intake-holding or exhaust member, as the ductwork is often inside structures, - the current air volume flow should be easily and sufficiently precise, , the terminal member should attenuate the sound passing from the reference channel to the room space and from the room space to the comparison channel, respectively.

Air volume flow measurement is usually the most difficult problem to solve. Methods based on the use of either a flow rate meter or a differential pressure meter are generally used to measure the volume flow at the terminals.

When using a flow rate meter, it is difficult to obtain a sufficiently accurate measurement result, regardless of the method, due to the numerous source sources. The flow-speed meter is sensitive to the effects of dirt, temperature, air turbulence and internal factors of the meter. Although these effects can be reduced by means of calibrations, such calibrations are often cumbersome and have to be performed relatively often.

The volume flow of air can be determined by means of a flow rate meter as follows. The air flow rate is measured at several points on the end face of the blow-off or exhaust member. The average of the obtained measurement results multiplies the so-called surface-alate-kljä. Such a method is very inaccurate, as the determination of the area factor is quite difficult and, in addition, depends on several different factors. In addition, the result of the same measurement varies quite a lot depending on the person performing the measurement.

3 70635

In another known method, in addition to a flow rate meter, a so-called anemometritorvea. However, the anemometer horn changes the pressure ratios and volume flows of the climate control plant.

In the above two methods using a flow rate meter, only 10-30% accuracy is achieved in the best cases. Such accuracy cannot, of course, be satisfactory.

When using a differential pressure gauge, the gauge itself does not cause any problems. The air volume flow can be determined by measuring the pressure difference caused by either a fixed or an adjustable throttle member. Without determining the volume flow, it is facilitated that the pressure difference is approximately proportional to the square of the volume flow at a given control position. On the other hand, however, this limits the usability of the fixed throttle member, as the pressure difference quickly becomes either too large or too small. In the case of an adjustable throttle element, the white problem is to determine the adjustment position with sufficient accuracy. Another source of error in differential pressure measurement of air volume flow is in the determination of measuring points. Thus, it has not been possible to measure the air volume flow with satisfactory accuracy using a known differential pressure measurement.

The object of the invention is to provide an improvement on the previously known solutions. A more detailed object of the invention is to provide a blowing element for supply air exhaust ducts, in which it is possible to adjust the volume flow of air in the easiest possible way. It is also an object of the invention to provide a blowing member through which the volume flow of air flowing can be easily determined with sufficient accuracy. Other objects and advantages of the invention will be apparent from the description of the invention.

The objects of the invention are achieved by a blowing valve for the supply or exhaust air ducts of air-conditioning plants, which is mainly characterized in that the measuring scale is arranged inside the flow duct behind the control element.

With the solution according to the invention, e.g. the following advantages: determination of the throttle of the control element can be performed easily and as accurately as possible, 4 70635 measurement result el independent of the measurement performer, the effect of manufacturing tolerance and clearances on the accuracy of the device is almost completely eliminated the effect on the measurement result can be substantially reduced, the accuracy of the device is not prone to damage, the device is easy to achieve 5% better volume flow measurement accuracy.

The invention will be explained in detail with reference to a preferred embodiment of the invention shown in the figures of the accompanying drawing, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a side view of a blower according to the invention.

Fig. 2 shows the blower according to Fig. 1 seen from the direction C.

Fig. 3 shows the blower according to Fig. 1 seen from the direction A.

Fig. A shows a detail from the direction D of the blow member of Fig. 1.

Fig. 5 shows another detail of the blow member according to Fig. 1 seen from the direction E.

In the embodiment according to Figures 1-5, the blower for air supply or exhaust air ducts according to the invention is generally indicated by reference numeral 10. The blower member 10 comprises a jacket 11 delimiting a rectangular flow duct 26. At the other end 13 and an upper edge strip 14. An adjusting member 15 is arranged in the flow channel 26. In this embodiment, the adjusting member 15 is an adjusting plate filled with insulator 17, which is fastened at one end, e.g. by welding with its hinge to the casing 11. 16 diapers. Thanks to the insulations 17, very good sound training is achieved.

The adjusting device of the adjusting plate 15 consists of a pin nut 18 and an adjusting arm 19, as best seen in Fig. 4. The other end of the adjusting arm 19 is fastened by means of spacers 20 and locking rings 21, as shown in Fig. 5. As can be seen from Fig. 5, at the end of the control arm 19 there is a notched recess from which the control arm 19 can be rotated, e.g. by means of a screwdriver, and thus adjust the throttle caused by the control plate 15 in the flow channel 26. In Figures 1-3, one of the throttling positions of the control plate 15 is shown in broken lines.

According to the basic understanding of the invention, a support 24 is provided in the flow channel 26 behind the control plate 15, which is provided with a measuring scale 25.

In this case, the constriction caused in each case by the control plate 15 to the flow channel 26 can be read directly from the measuring scale 25 through the reference channel 26, i.e. through the terminal member 10. At the same time, the support 24 of the measuring scale 25 acts as a support member for the jacket 11.

According to another important feature of the invention, the blowing member 10 is provided with at least one fixed differential pressure measuring element 22, which in this embodiment is located at the top of the flow channel 26 and extends through the flow channel 26. The differential pressure measuring member 22 is a measuring tube which is fastened by bracket-like fastening means 23.

The air flow through the blowing member or terminal member 10 according to the invention can be easily and quickly measured. In this case, it is only necessary to read the current pressure difference and the throttle of the control element 15. The pressure difference is obtained directly, for example, from a U-shaped manometer which is an extension of the measuring tube 22 outside the terminal member 10. The throttle of the control member 15, in turn, is directly readable through the terminal member 10 on a scale 25. From the diagram where the vertical axis has a pressure difference and the horizontal axis the air volume flow, the respective volume flow is directly available when the size of the blower member 6 70635 10 the pressure difference caused by the control element 15. Accordingly, the volume flow of air flowing through the blowing member or terminal member 10 can be easily adjusted to the desired amount. When the pressure difference caused by the throttling of the control element 15 is known, it is seen from the diagram to which control position the control element 15 must be throttled in order for the desired air volume flow to flow in the flow duct 26. The adjusting arm 19 is rotated so that the position of the adjusting member 15 visible directly from the measuring scale 25 through the terminal member 10 is correct. Since the changed throttling position of the control member 15 may also change the pressure difference somewhat, the value of the pressure difference is read again and, if necessary, the fine adjustment is performed again by slightly turning the control arm 19. It should therefore be noted that when adjusting the air flow without the volume flow according to the invention, the value of the pressure difference can be continuously monitored.

Claims (4)

7 70635 A blowing member (10) for supply or exhaust air ducts of air conditioning installations, comprising a rectangular flow channel (26) delimited by a jacket (11), a control element (15) arranged in the flow channel (26) and a control device (18, 19) by means of which the control element (15) the constriction caused by the flow channel (26) is adjustable, and which blowing member is provided with a measuring scale (25) from which the respective constriction of the control element (15) can be read to determine the volume flow by means of a pressure difference, characterized in that the measuring scale (25) is located inside the flow channel (26) behind the control element (15). Blowing element according to Claim 1, characterized in that the support (24) of the measuring scale (25) also acts as a plug for the jacket (11). Blowing element according to Claim 1 or 2, characterized in that the blowing element (10) is provided with at least one fixed differential pressure measuring element (22). Blowing member according to Claim 3, characterized in that the measuring member (22) is a measuring tube which is arranged at the top of the flow channel (26) and extends through the blowing member (10).