DD211855A1 - DEVICE FOR CONTROLLING THE AIR FLOW IN USE OF INDUSTRIAL OVEN - Google Patents

Abstract

The invention relates to a device for controlling the air flow in Nutzraeumen of industrial furnaces, in particular laboratory glassware. The invention has the goal to reduce the energy required for the generation of the air flow to the required level and the energy losses occurring. It was the object of the invention to provide such a device that allows a combined adjustment of the air flow and the set temperature. According to the invention it is provided that in the forced air duct, an actuator is arranged and its Betetigungselement is coupled to the Betetigungselement for the desired temperature setting.

Description

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Device for controlling the flow of air in the utility rooms of industrial ovens. ___

International Patent Classificationί F 27 B 17/00, 17/02; F 27 D 7/00, 19/00 Field of application of the invention?

The invention relates to a "device for controlling the air flow rate in forced ventilated utility rooms of industrial ovens." Such devices can be used, for example, in laboratory heat and laboratory dryers, bacteriological incubators, HeUB air sterilizers and related products regardless of their type of heating

Characteristic of the known technical solutionsί

To realize a minimum spatial temperature gradient in the utility rooms of preferably electrically heated industrial furnaces depending on the design horizontal

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or -Viritual forced air ducts applied »By appropriately directed Yolumenströme the heated air such a flooding of the Eutzraumes is achieved _s that the temperature stratifications remain limited to the application-technically justified minimum ·

The conventional example, in the laboratory techniques industrial furnaces allow the use in the temperature range between + 30 ° C and S-300 ⁰ G. As a result of the temperature dependence of the density of the air contained in the chamber at the high working temperatures, a pronounced Temperaturschich · "must auftrittj tung the be Yolumenstrom of air blown through forced ventilation air dimensioned _$ that this matter is counteracted "

High flow rates require high energy expenditure and promote technical reasons Snergieverluste * Inevitably cause such high velocities is very loud, "In performance terms are indeed _s required low temperature gradients but the high air velocities in Butzraum are undesirable ₅ because the heating lighter substances is eliminated in open vessels and Contamination of furnace components (ducts, flow generators) can not be ruled out,

Aim of the invention

The invention has the purpose of reducing the energy required for the generation of the air flow to the required level and thus the energy losses and to reduce the risk of contamination in light j substances contained in open vessels *

Explanation of the essence of the invention

The invention had the object of providing a device for controlling the air flow for the forced ventilation in dependence on the preselected setpoint temperature.

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The solution of this object according to the invention is ₉ that in the forced air duct, an actuator is arranged and the actuating element of the actuator is coupled to the actuator for the target temperature setting ·

In a first embodiment is provided: As an actuator air control flaps in the Mhe freshluftzuführungsklappe and the recirculation damper are arranged «They are kinematically coupled via a lever arrangement with a cam which sits as well as a cam of a temperature controller on a rotatable by a knob adjustment shaft

In a second embodiment is provided: As an actuator, the valve between the Prischluftzuführungs- and the recirculation flap arranged forced air generator is determined · His drive motor is connected via a control circuit to a Sinstellregler _s the. is kinematically coupled to the Sinsteilregier a temperature controller «

Embodiment:

In the accompanying drawing show:

Pig «1 the schematic diagram of the first embodiment of the device

Pig · 2 the schematic diagram of the second embodiment of the device

Both embodiments relate to a laboratory heat cabinet *

The outer casing 2 of the forced air shaft 10 is surrounded by a heat insulation layer 1 to prevent energy losses. The inner casing 3 delimits the dirty space 20 and forms the forced air shaft 10 simultaneously with the outer casing 2. The forced air generator 5 with drive motor generates the desired volume flow.

In the illustrated in Figure 1 principle of recirculation mode are the Prischluftzuführungsklappe 6 and the exhaust air valves

19 closed while the recirculating air flap 7 is open «The flaps 6 ₉ 7 and 19 are actuated simultaneously by a common slide 9.

The sucked in from the ITutzraum 20 air promotes the forced air generator 3 via the arranged in the forced air duct 10 radiator 4- to hot air supply 8 and thus again in the Uutzraum 20 _β

On the knob 11, the desired working temperature in the working space 20 is preselected, via the temperature controller 16 and a temperature sensor, not shown, and installed in the utility room 20, the temperature of the inevitable flowing air is controlled. As a result of the mechanical coupling between the cam 12 for the target temperature and the cam 14 for the air flow preselection via a lever assembly 21 at the same time the opening of the air control flaps 18 changed so that at low operating temperatures in ITutzrauni 20 only a small air flow and at high working space temperatures ensures a higher air flow becomes.'

The fresh air supply flap 6 and the exhaust air flap 19 are opened while the recirculating air flap 7 is closed. The flaps 7j 9 and 19 are in turn actuated simultaneously by a common slide.

The air sucked in from the environment promotes the forced air generator 5 via the arranged in the forced air duct 10 radiator 4 to the hot air supply 8 and thus in the ITutsraum 20 _o The acted example with moisture leaves the air space 20 through the exhaust air valves 19,

On the adjustment knob 11, which is coupled with two electrical adjustment controls 13 »15 via an adjusting shaft 22, the desired operating temperature for the trimming space 20 is selected. About the temperature controller 16 and the not shown and in. Uutzraum 20 arranged temperature sensor is

regulated the temperature of the forced air flowing. Due to the mechanical coupling between the electrical control regulators 13 , 15 ¹ ^ - ^e ~ * ~ additionally provided control circuit 17 for the drive motor cause changes to the knob 11 simultaneous changes in the set temperature and the air flow in the working space 20 · With correct dimensioning of the slopes of the cams 12 and 14 * bzw., the characteristics of the adjustment controls 13 and 15 is achieved daJ3 each working temperature in the working space 20, the optimum air flow rate is assigned synchronously ·

In a further embodiment, between the electrical adjustment controls 13; 15 for the temperature and air volume preselection one preferably equipped with microelectronic components and fixed or freely programmable circuit arrangement are installed so that a program-dependent control of the amount of air as a function of the Hutzraumtemperatur is realized «Such embodiments cause the technical advantages of shortening of heating sides and the. program-controlled influencing of vVarmbehandlungsprozesse running in the Hutzraum 20 «

9fi.M 1983 * 064563

Claims (3)

- 6 claim of invention: 1 · Device for controlling the air flow in the utility rooms of industrial ovens j, in particular laboratory heat cabinets? characterized in that in the forced air shaft (10) an actuator (5; 18) is arranged and the actuating element (14-j 15) of the actuator (5; 18) is coupled to the actuating element (12; 13) for the desired temperature setting _e 2ο apparatus for controlling the airflow according to item 1, characterized in that _s as an actuator air control flaps (18) in the Fähe the Frischluftzuführungsklappe (6) .and the recirculation flap (7) and arranged via a lever assembly (21) kinematically with a cam (14). when. Actuator are coupled _? which sits on a cam disc (12) of a temperature regulator (16) and an adjustment knob (11) having Sinstellwelle (22) » 3 · Apparatus for controlling the airflow according to item 1j, characterized in that _{3 is provided} as an actuator of the Prisehluftzuführungsklappe (6) and the Ualuftklappe (7) arranged forced air generator (5) whose .Antriebsmotor via a control circuit (17) to an adjustment ( 15) is connected as an actuator j which is kinematically coupled to the IDinstellregler (13) of a temperature controller (16). For this 2 sheets patent drawing: η, η I. K £ 2 *?