DE71575C

DE71575C - Device to control the draft in ventilation ducts

Info

Publication number: DE71575C
Application number: DENDAT71575D
Authority: DE
Original assignee: H. RECKNAGEL in Winter thur, Schaffhauserstr. 1724, Schweiz
Anticipated expiration: 1913-02-23

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Vorliegende Erfindung betrifft eine Vorrichtung, welche dazu dient, die Ueber- oder Unterschreitung einer bestimmten Luftgeschwindigkeit in Ventilationskanälen etc. zur Anzeige zu bringen. Die Erfindung gründet sich auf das bekannte Princip der mit tafelförmiger Winddruckflä'che wirksamen Anemometer und die Neuerung besteht in der Hauptsache darin, dafs, um die Bewegungen der um eine horizontale Drehachse schwingenden Tafel unter dem Einflufs des Luftzuges stetiger zu machen, eine Vermehrung des Trägheitsmomentes mit Einrichtung eines wirksamen Gewichtsausgleiches unter gleichzeitiger Erzielung der gröfstmöglichen Empfindlichkeit herbeigeführt wird. Für den bei vorliegender Vorrichtung mit in Betracht kommenden Zweck einer elektrischen Fernübertragung der Anzeige sind nämlich die wie gewöhnlich construirten Anemometer deshalb unanwendbar, weil sie, wenn mit grofser Empfindlichkeit ausgerüstet, pendelartig die dem zeitweisen Luftgeschwindigkeitsmittel entsprechende Lage (Ableslage) vor- und rückwärts durchschwingen und somit abwechselnd an jedem Contactpunkt anschlagen würden. Die neue, insbesondere für Schulen, Krankenhäuser und Gebäude mit centraler Ventilationsanlage· bestimmte Vorrichtung kennzeichnet sich durch fast pendelfreien Uebergang während der Einstellungswechsel bezw. durch eine ruhige, leicht ablesbare Zeigerstellung, welche zur sicheren Bethätigung von elektrischen Contacten behufs Fernmeldung einer bestimmten unteren oder oberen Grenze der Luftgeschwindigkeit ausgenutzt werden kann.The present invention relates to a device which serves to the over or Undershooting a certain air speed in ventilation ducts etc. for display bring to. The invention is based on the well-known principle of the tabular Anemometer effective wind pressure area and the innovation consists mainly in dafs to the movements of the panel swinging around a horizontal axis of rotation to make the influence of the draft more steady, an increase in the moment of inertia with Establishing an effective weight balance while at the same time achieving the greatest possible Sensitivity is brought about. For the present device with consideration The coming purpose of an electrical remote transmission of the display are namely as usual, anemometers are inapplicable because they, if larger, Sensitivity equipped, pendulum-like corresponding to the temporary air velocity mean Position (reading position) swing backwards and forwards and thus strike alternately at each contact point. the new ones, especially for schools, hospitals and buildings with central ventilation systems A certain device is characterized by an almost pendulum-free transition during the change of setting respectively by a calm, easy-to-read pointer position, which is used for the safe actuation of electrical contacts Remote reporting of a certain lower or upper limit of the air speed is exploited can be.

Auf der Zeichnung ist:On the drawing is:

Fig. ι eine perspectivische Uebersichtsdarstellung, die Welle mit dem durch den Luftzug bewegten Flügel einerseits und mit der Ausgleichvorrichtung andererseits veranschaulichend,Fig. Ι a perspective overview representation, the shaft with the wing moved by the draft on the one hand and with the compensating device on the other hand, illustrating

Fig. 2 ein Längsschnitt durch eine Ausführungsform des Ventilations-Controlapparates mit. Darstellung des Einbaues bei einem steigenden Ventilationskanal,2 shows a longitudinal section through an embodiment of the ventilation control apparatus. Representation of the installation with a rising ventilation duct,

Fig. 3 eine Vorderansicht zu dem Apparat nach Fig. 2 von der Zeigerseite gesehen, an welcher der mit Glas versehene Deckel aufgeklappt erscheint, wie zur Vornahme der Justirung nöthig.Fig. 3 is a front view of the apparatus of Fig. 2 seen from the pointer side which the lid provided with glass appears opened, as for making the adjustment necessary.

Wie aus Fig. 2 ersichtlich, tritt als wesentlicher Theil der Vorrichtung die Zeigerwelle a hervor, die, in Körnerspitzen gelagert, einer leichten Drehung oder Schwingung fähig ist und welche an dem in den Luftkanal hineinreichenden Ende den aus einer Aluminiumplatte bestehenden Flügel f trägt; am äufseren Wellenende ist die mit den Ausgleichmitteln versehene Scheibe d angebracht. Die stellbaren Schrauben s s¹, an denen die bezeichnete Spitzenlagerung der an dieser Stelle gekröpften Welle α stattfindet, sind an gegenüberliegenden Armen eines Ständers oder Pfostens b angeordnet. Derselbe sitzt an der Innenseite des Gehäuseringes B, mit dem die ganze Vorrichtung unter Einfügung in einen die Maueröffnung umrahmenden Ring A festgelegt wird, jedoch so, dafs nach Vollendung der staubenden Maurerarbeit der seither geschützte Apparat nachträglich in den eingemauerten Ring eingesetzt werden kann.As can be seen from Fig. 2, the pointer shaft a emerges as an essential part of the device, which, supported in grain tips, is capable of a slight rotation or oscillation and which at the end reaching into the air duct carries the wing f consisting of an aluminum plate; on the outer end of the shaft, the washer d provided with the compensating means is attached. The adjustable screws ss ¹ , on which the designated point bearing of the shaft α cranked at this point takes place, are arranged on opposite arms of a stand or post b . It sits on the inside of the housing ring B, with which the whole device is fixed by inserting it into a ring A framing the wall opening, but in such a way that after the dusty masonry work has been completed, the device, which has been protected since then, can be subsequently inserted into the walled-in ring.

Claims

The pointer shaft α goes on the side of the wing f on this side through the plate e, which forms a kind of sealing cover on the housing ring B, and on the other hand through the fixed pointer plate D, which is provided with appropriate designations or marks, so that it moves freely and with the least possible resistance can rotate within a certain angular deflection.

The seated disk α on the shaft d in front of which the Abschlufs according aufsen issued a glass panel hinged door E forms, transmits (Fig. I) besides the pointer \ two gh on each other perpendicular to rod-shaped arms g with displaceable ballast weights ¹ h ^{1 are} equipped. These weights, which can thus be regulated by changing their effective lever arm, form on the one hand a means of balancing the weight of the wing f and on the other hand a lifting weight for the same in the sense that it strives back into a horizontal position (with a vertically rising ventilation shaft) when it is not operated. On the disk d are also to balance the pointer \ and the lifting weight h,. when it is initially in the position of the axis of rotation, diametrically opposite the metal pieces q are attached.

If one wants to adjust the device for bringing the pointer to the normal mark with a certain air draft, one uses an ordinary anemometer in connection with the same, regulates the pull to the certain measure and then shifts the lifting weight h so that the pointer shows what is normal is possible at any current strength by suitable selection of the torque of the lifting weight. The deviation of the pointer from the normal position in one or the other direction will then always be taken as a sign that the draft strength in the ventilation duct exceeds or falls below the predetermined level.

The deflection movement of the pointer can now be used to close a circuit formed by three wires in such a way that the abnormal condition of the ventilation is reported to a control room (for example, to the doctor's room in a hospital). The related device shown in the drawing includes the contacts xy arranged on both sides of the pointer \ in connection with the terminals i, 2, the pointer \ itself being made into a conductor by the fact that the common return line r , which includes a battery, is connected to the Terminal 3, Fig. 3, is brought up, which is directly connected to the metallic housing of the device, while those terminals 1, 2 are isolated from the metal base. It will be appreciated that these Strömkreisanordnung, wherein the pointer ^ twofold Stromschliefsung according as it swings in the one sense or another ^1, occasioned can be verwerthet for delivering an (optical or acoustic) signal to BEZW. to display a too strong or too weak draft. By changing the position of the flap, the control of the pull can then be carried out, with a weakening or reinforcement of the same, so that the normal pointer position and thus the condition prevailing and intended at the time of the adjustment occurs again. The device can also be arranged according to the same system with ventilation ducts that run differently than vertical.

Patenτ claim:

A device for controlling the pull in ventilation ducts, in which a shaft mounted in grain tips carries on the one hand a plate ffJ to be exposed to the draft and on the other hand a pointer disk (d) , on whose arms (gh) adjustable weights (g ¹ h ^l ) one for the respective pull Enable the appropriate setting and, by increasing the moment of inertia, cause a smooth gait.

1 sheet of drawings.