| 摘要 |
Electric heating device for beds, in particular water beds, incubators and other similar applications in which there are strict requirements as to temperature accuracy and to safety. The problem with such devices is to obtain a sufficiently accurate temperature control without making the design too expensive. The heating device preferably comprises a flat heating element (1) and a switch and control unit (2) with a thermostat (8 - 11). This unit is connected to the heating element through electrical leads (6, 7). Between the heating element (1) and the switch and control unit (2) there is provided a hollow, preferably somewhat flexible hose member (3) which in addition to accommodating the electrical leads (6, 7) also accommodates other components in the device, in particular a sensing element (9) for the thermostat. There is also a general description of a thermostat for electrical heating devices having strict requirements as to temperature accuracy, and comprising an accelaration element (14), in which the heating effect from the acceleration element (14) is adjustable, preferably by means of an adjustable series resistor (17) or a potentiometer in a current supply circuit (15, 16) for the acceleration element (14). |
