FI90723C - electric heater - Google Patents

Description

90723 The present invention relates to an electric heater comprising one or more electric resistors for generating heat in a space for heating 5 heaters, i.e. a steam room in which a fresh air inlet and an air inlet are provided, such as an air inlet and an air outlet and means. in connection with, a controlled valve fitted to the fresh air of the loyal room 10 when the exhaust air of the loyal room leaves through a duct system equipped with an exhaust air extractor or a vacuum cleaner fitted in connection with the exhaust air opening of the loyal room.

One of the most significant factors influencing sauna enjoyment is the quality and quantity of breathing air in the lobby room. Proper air conditioning of the sauna is of great importance for maintaining sufficient air freshness and oxygen content in the lobby room. According to the latest research, when using mechanical ventilation or when the air exits as a free outlet to the flue going to the roof, it is recommended to keep the stove fresh at least 50 cm above the stove. The exhaust air valve, in turn, should be located as far as possible from the heater and relatively low, for example under benches. With the il-25 leveling carried out in this way, divide the temperature difference between the upper and lower part of the lobby room as small as possible.

Although the importance of ventilation in the lobby room has been recognized, no equipment has been provided in use to implement this ventilation in an optimal manner. It is therefore an object of the present invention to provide an electric heater which offers a solution to this problem. This electric heater according to the invention is characterized in that the heater comprises control means for the ventilation means and that the control means for the time and / or temperature-controlled switch are switched on. and return the air exchange to a normal level after the desired time after the heater has been switched off or at another temperature lower than the above-mentioned temperature. Thus, the ventilation of the lobby room, i.e. the level of ventilation, is controlled by means associated with the heater, whereby it is possible to simply and efficiently take into account the different operating modes of the heater and thus also of the 10 lobby rooms.

Separate lobby rooms or sauna rooms have the simplest and most efficient fan located in connection with the fresh air opening. In this way, efficient air supply is guaranteed and the possible 15 leaks in the lobby room do not affect the ventilation operation. If, on the other hand, the apartment sauna is in question, where the ventilation of the lobby room is connected to a ventilation duct equipped with a top extractor, efficient ventilation can be provided by this top extractor by equipping the sauna with fresh air inlet 20 with a valve controlled by the heater. An alternative solution for a fan located in the fresh air opening is provided by a vacuum cleaner fitted to the exhaust air opening, but in this case the structure of the lobby room requires sufficient tightness to allow air to be sucked in from the desired location, i.e. fresh air inlet 25. On the other hand, it should be noted that the use of blowing causes a slight overpressure in the lobby room, rnika may cause moisture to penetrate into the lobby room structures.

According to the invention, the control means by which the mechanical ventilation is controlled are either time-controlled or temperature-controlled switching means or combinations thereof. Switching means controlled in this way make it possible, for example, to vent the ventilation to a level advantageous for saunaing after the desired time after switching on the heater-35 and, accordingly, to return the ventilation to normal.

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90723 3 levels after the desired time after the heater has been switched off, thus ensuring adequate drying of the lobby room. Alternatively, the same operation can be achieved with temperature-controlled switching means which, in the desired temperature, which may correspond to a low sauna lamp temperature, control the ventilation to a suitable level, else- where. It is also possible that the ventilation is started 10 in a temperature-controlled manner, but the cut-out is taken care of in a time-controlled manner.

The electric heater according to the invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows a cross-section of a lobby room and Figure 2 shows an exemplary wiring diagram for means associated with an electric heater for controlling ventilation in a lobby room.

Figure 1 shows a cross-section of the lobby room-20, in which the ventilation is implemented in the most advantageous manner according to current knowledge. Here, the fresh air inlet 6 is located at least about half a meter above the heater 9 and the outlet 10 is located as far as possible from the heater at the bottom of the lobby. Fig. 25 sa 1 is an adjustable valve 7 connected to the fresh air inlet 6 and the outlet 10 is connected to a ventilation duct 8 equipped with an exhaust air device, such as a top extractor 8. By placing the fresh air inlet 6 sufficiently above the heater, fresh air can be mixed as efficiently as possible. to the upper space in the lobby room and at the same time minimize temperature gaps between the upper and lower parts of the lobby room. The exhaust air opening 10, in turn, is located as low as possible in order to keep the exhaust air as cold as possible and thus to minimize the heat losses caused by the exhaust air.

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Further, the lobby room of Fig. 1 is provided with an exhaust air valve brick 11 located at the top of the lobby room. The purpose of this valve 11, which is normally closed during saunaing, is to enhance the cooling 5 and drying of the lobby room after saunaing. However, when using the electric heater according to the invention, the need for this ventilation valve 11 is significantly reduced.

Fig. 2 shows an exemplary wiring diagram for means associated with the electric heater 9, which enable the ventilation of the lobby room to be controlled to the electric heater 9 depending on the operating state. The means shown in Fig. 2 comprise an electric motor M acting as a motor for a fan or a vacuum cleaner, which is intended to be placed either to blow air into the steam room freshly connected to the inlet 6 or to draw air out and 3 for the M ohm-control of the motor.

In the solution shown, the motor M is provided with 20 windings, so that it can be operated with two different powers. When the lobby room is not used for sauna use, the motor M is running at low power, receiving its operating current from the mains phase L via the switch 4, the overload protection 5 and the contact 3A of the relay 3. The second contact plug 3A of the relay 3 is closed when the relay 3 is in the dormant state, as shown in Fig. 2. In this way, the motor M can be used to ensure that the lobby room is well ventilated between saunas.

When the heater 9 is then switched on by closing the control switch 30, on the other hand the heater receives control current via line K from the mains phase L through the control fuse S1 and at the same time the current is connected to relay 2. The other terminal of this relay a traction retarded relay, whereby its contact 2A 35 closes after some time after the switch 1 has closed 90723 5. Thus, the temperature in the lobby room has time to rise significantly and preferably relatively close to the desired sauna temperature before the contact 2A of the relay 2 closes, switching the control current to the relay 3, which in turn closes its contact 3B and opens its contact 3A. Opening of this contact 3A means a power failure from the lower power winding of the motor M and closing of the contact 3B means a current switching to the higher power winding of the motor M, thus increasing the sample power of the motor M.

When the power is switched off from the heater 9 by opening the control switch 1, the current from the relays 2 and 3 is also switched off. However, the relay 3 is a so-called delayed relay, whereby its contact 3B opens only some time after the power 15 In this way, the fan will continue to operate at higher power for some time after the electric heater is switched off. This time, which can be, for example, about 2 hours, ensures efficient cooling and drying of the lobby room.

Figure 2 shows only one means associated with the electric heater for controlling the ventilation of the lobby room. In this example, the lobby room ventilation control means are time-controlled. Instead of these described time-controlled relays, ai-25 controlled switches could of course also be used, in which case their operating times could also be simply set. An alternative to time-controlled switching devices is provided by temperature-controlled switching devices, which bring the lobby room ventilation to the sauna level when the lobby room temperature starts at the desired 30 sauna temperatures. Thus, more efficient ventilation could be considered to be switched on, for example at a temperature of about 60 ° C, and returned to a normal level of paint, for example at a temperature of about 30 ° C.

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Of course, it is possible to use a combination of time- and temperature-controlled switching means. A rather natural entity would be achieved by directing the air exchange to the sauna level on the basis of the loyal room temperature 5 and returning it to the normal level in a time-controlled manner after the desired time after the heater has been switched off.

As shown above, ventilation can be brought to the sauna level, which means conventional ventilation, i.e. so-called more efficient ventilation than normal, by either controlling the vacuum cleaner for the lobby room for higher power or the opening edge for a larger air vent connected to the lobby. In the latter case, the exhaust air opening of the lobby room is connected to a ventilation duct provided with a top extractor 15 or other similar deaeration device. Thus, the exemplary embodiments described above illustrate only one exemplary solution, and it is to be understood that the described solution may be deviated from without significantly departing from the scope of the invention as defined by the appended claims.

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Claims (2)

90723 An electric heater comprising one or more electrical resistors for generating heat in a heater storage space, i.e. a lobby room, in which a fresh air inlet (6) and an exhaust air opening (10) and in connection with the air inlet (6), a controlled valve (7) fitted to the fresh air inlet (6) when the exhaust air of the loyal room exits through a duct (8) equipped with an exhaust air extractor or a vacuum cleaner (M) fitted in the air outlet (10) of the lobby , characterized in that the beam handles the control means for the ventilation means and that the control means comprises time and / or temperature controlled switching means (2,3) which control the ventilation to the sauna level after a desired time in the heater (9). -sa loyal room IMmpot mode and return ventilation to 20 normal levels desired n after the stove has been switched off or in another temperature lower than the above-mentioned temperature. Electric heater according to claim 1, characterized in that the time-controlled switching means 25 comprise a traction-delayed relay (2) for bringing ventilation to the sauna level and a pMM-delayed relay (3) for returning the ventilation to a normal level.