DE2657164A1 - Warm air hand dryer - incorporates motor with fan electric heater, and sensor, with rotationally symmetrical interior preventing air escape - Google Patents

Abstract

The warm air hand dryer contains a motor with a fan (1) on the back of the gadget which conveys air round a guide piece (2) to the outer sides. Behind the electric heater (3) is a temp. sensor (4) which regulates the air temp. The air passage is rotationally symmetrical, so that the air is conveyed in a widening section so that there is slight excess pressure (7) at the inlet for the hands. This prevents any air from passing outwards through the inlet. Air is brought in from outside in the under-pressure area (9) near the fan axis pref. through a filter or disinfectant system (13) (14). The air circulation can be increased around the hands by turbulence producer (6).

Description

Patent application «v

Warm air hand dryer with temperature-controlled circulating air

The invention relates to a hot air hand dryer containing a fan and an electrical heating element. The new device is characterized by considerable energy savings, because only the relatively small amount of outside air mixed in needs to be heated up. The intended temperature control of the circulating air allows the air to be heated up quickly at the beginning and at a rate favorable for quick and pleasant drying of the hands Limit value.

The advantages of the new device are in particular:

Since only small amounts of air from the environment are mixed in, is it is relatively easy to make the circulating air sterile, e.g. by using UV lamps or electrostatic filters in the intake duct (Fig. 1) the outside air to be mixed in.

By guiding the circulating air symmetrically to the hands, the drying time can be shortened considerably, since the air is not as with the usual hand dryers from one side but at the same time is blown on the hands from all sides. In addition, by means of devices for swirling the air that is on the hands is blown, the drying time can be further shortened, since the heat transfer to the hands with increasing turbulence grows.

809825/0255

Section T shows the air flow in the hand dryer and its basic structure.

A motor with a fan (1) is transported to the rear of the device the air around an air deflector (2) along the outer walls. The air comes from the fan (1) to the heater (3) ter which a temperature sensor (4) is attached, which has a suitable Electronics (5) regulate the air temperature.

Before the circulating air reaches the hands, it can pass through suitable turbulence generator (6) are swirled in order to then come into contact with the hands to be dried.

On the wall side of the device is to compensate for the high pressure area (7) circulated air escaped from below via a filter system (8) small amounts of outside air into a negative pressure area (9) via a Sucked in channel (10) and mixed in circulating air. This sucked in outside air also serves to cool the engine.

A contactlessly functioning switch (11) is known per se Art can be accommodated at any point in the device where the desired change direction occurs with the hand close to it.

On the underside of the device holes (12) are made so that no significant exchange of air can take place there However, water can run off.

To kill or filter out germs that are still in the circulating air, filters (13) can be placed in the air flow, e.g. in front of the blower. or attach UV lamps (14).

809825/0255

eerseite

Claims (8)

Claims hot air hand dryer with convection Warm air hand dryer, containing a blower and an electric one Heating element, characterized in that it is used to dry the hands on these and on a temperature sensor Most of the air is sucked in again by the fan and then on again after it has been heated up again to a setpoint value is passed by the hands. 2. Warm air hand dryer according to claim 1, characterized by a Almost rotationally symmetrical shape of the air flow, which means that the circulating warm air is blown onto the hands from all sides will. 3. Warm air hand dryer according to claims 1 and 2, characterized in that that the air is guided in a widening cross-section, so that at the introduction opening for the hands inside there is a slight overpressure, so that at this opening no air flow from the outside to the inside can take place. 4. Warm air hand dryer according to claims 1 to 3, characterized in that that the air supply from the outside in the negative pressure area (9) near the fan axis preferably via a filter or a Disinfection system happens. 5. Warm air hand dryer according to claims 1 to 4, characterized in that that the air temperature inside the device through a temperature sensor (4) controlling the heating power on a fixed setpoint is maintained. 6. Warm air hand dryer according to claims 1 to 5, characterized in that that the heating power is regulated as a function of a radiation sensor that polls the hand temperature. 7. Warm air hand dryer according to one of claims 1 to 6 thereby characterized in that germicidal or fil tering in the stream of circulating air Devices (13, 14) are installed, such as UV lamps or electrostatic filters. 8. Warm air hand dryer according to one of claims 1 to 6 thereby characterized that the "blown on dle ^, Hä.näea" by a joined Vortex formers emöR'te 'iurbliTehz. 8 0 9 8 2 5/0 2 5 S ORIGINAL INSPECTED