DE102007024999A1 - Thermostat for regulating temperature of e.g. automatic dishwasher, has closed circuit contact attached to fixed contact for opening or closing electrical continuity over independent transmission units for closed circuit contact - Google Patents

Abstract

The thermostat has an external housing comparing a massive negative temperature coefficient unit for temperature regulation. Two bimetal units (3, 4) act on closed circuit contacts (5, 6). Each closed circuit contact is attached to a fixed contact for opening or closing the electrical continuity over independent transmission units for the closed circuit contacts. The bimetal units have two parallel disk-shaped bodies. The transmission units are formed from a pin (8), which is connected with the bimetal units at one end and with the closed circuit contacts at another end.

Description

The The present invention relates to a thermostat for temperature control with a double security system.

State of the art

It is known in electrical household appliances such as automatic dishwashers to carry out a regulation of the temperature size by, if the water has reached a certain temperature, a bimetallic element opens an electrical circuit, to the implementation to cause another action or damage Furthermore Part of the household electrical appliance to avoid. Another example of performing these operations is the use of fuses, although this embodiment the main one Disadvantage is that it is not reusable and therefore by a specialized operator needs to be replaced.

Description of the invention

Of the present invention is based on the object, an improved To provide a thermostat, which eliminates the aforementioned disadvantages and also additional Benefits that result from the following description.

Of the improved thermostat for temperature control according to the invention is characterized by an outer housing, the a solid NTC element for temperature control and two bimetal elements contains each of which acts on a normally open contact, which is a fixed contact for opening or closing the Current passage over independent transmission elements for each the normally open contacts are assigned so that the thermostat thereby gets a double security, unlike the currently used thermostats that only a simple safety of temperature control and not a double enable, as is apparent according to the invention.

by virtue of of these properties a single thermostat with a double safety system, the reusable or overloadable is and for example the use of a double fuse avoids, with the thermostat is easy to assemble and low production costs Has.

According to one another embodiment According to the invention, the bimetallic elements have two parallel disk-shaped bodies.

Preferably are the transmission elements formed by a pin, which at one end with a bimetallic element and being in contact with a working contact at the other end, being a pen for Each bimetallic element is provided.

The Invention will be described below with reference to the accompanying drawings, for example explained.

Brief description of the drawings

1 is a side view of a thermostat according to the invention;

2 is from another point from a side view of the thermostat according to the invention;

3 is a longitudinal section of the thermostat of the previous figures;

4 is an enlarged longitudinal section of the thermostat according to the invention, and

5 is a cross section of the thermostat along the line AA.

Description of a preferred embodiment

As the figures show, the thermostat for temperature control with double safety, preferably in an electrical household appliance, an outer housing 1 made of a molded plastic material, which is a solid NTC element 2 (please refer 3 ), which performs the temperature control in conjunction with a conventional external connection, and two bimetallic elements 3 . 4 which respond in a preset temperature range, each of which is to a normally open contact 5 . 6 acting on a fixed contact for opening or closing the flow of current through independent transmission elements through one of the contacts 5 . 6 is assigned, whereby the thermostat is given a double security. The NTC element 2 is in a holder 12 on the outer casing 1 is fixed and at one end an external, protruding connection 13 having.

The fixed contact is with connections 10 connected to signal the control system of the device in which it is installed, the occurrence of a failure or a change of a functional section of the household electrical appliance. The bimetal elements 3 . 4 include two disc-shaped bodies arranged in parallel and under a metal cover 7 are included, which is located in the lower part of the thermostat. The upper part of the thermostat is with a protective cover 11 covered by plastic material.

The transmission elements are formed from a pin made of a suitable ceramic material, which is at one end with a bimetallic element and at the other end in contact with a normally open contact, wherein two pins 8th . 9 , one for each bimetallic element, are provided, which are concentric with each other, as clearly 5 shows.

the As far as described thermostat can be a pulse or the like be assigned to the normally open contact in its initial position such that the thermostat works again, this process by the actual use or a Operator performed becomes.

Claims (3)

Thermostat for temperature control, characterized by an outer casing ( 1 ), a solid NTC temperature control element and two bimetallic elements 3 . 4 each of which has a working contact ( 5 . 6 ) acting on a fixed contact for the opening or closing of the current passage via independent transmission elements for each of the working contacts ( 5 . 6 ) is assigned, so that the thermostat receives a double security. Thermostat according to claim 1, characterized in that the bimetallic elements ( 3 . 4 ) comprise two parallel disc-shaped bodies. Thermostat according to claim 1, characterized that the transmission elements are formed of a pin which at one end with a bimetallic element and at the other with a normally open contact in contact.