NL8101716A - THERMOSTAT. - Google Patents

Description

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P. Denz - 7 1 τΓ - - I £. V. L--. . j -S APR 1981 j

Thermostat. ____ |

The invention relates to a thermostat with an expandable material arranged in a substantially rigid housing which acts on a push pin via a membrane.

In known thermostats of this type, the expandable material is enclosed in a rigid cup-shaped enclosure. The expandable material hereby takes the form of a solid cylinder, the surface of which is relatively small in proportion to its volume. In conjunction with a relatively poor thermal conductivity of the conventional expandable materials, these thermostats exhibit a slow behavior over time, respectively. a low response speed, so that these elements are less suitable especially for sanitary cold and hot water valves. To overcome this drawback, it is known from German patent application 24 41 224 to arrange the expandable material in a hollow body, which is delimited by two outer and inner casings coaxially interlocking, a hollow cylinder and in the transition region to the membrane is traversed by passages-forming sleeves which connect the spaces inside and outside the hollow body. This embodiment improves the speed of response, but the manufacture and filling of the housing is difficult and very expensive.

The object of the invention is therefore to provide a thermostat with a high response speed that can be manufactured by simple means.

This task is solved according to the invention in that a non-compressible displacer body is provided in the housing, which forms the expandable material on the house walls into a relatively thin layer. Further features of the invention are discussed in more detail below.

With the measures according to the invention it is achieved in a surprisingly simple manner that the expandable material, for example wax, can be applied in an optimum distribution relative to the surface of the thermostat housing, so that the response speed of the heating required for sanitary cold and hot water mixing valves is 35. thermostat can be reached. The inexpensive form of the thermostat housing, the introduction of the expandable material and the closure of the encapsulation, for example by conversion, can be carried out in a known manner.

8101716 2 • Ϋ

The displacer body can be produced inexpensively by compression molding of aluminum or zinc alloy reap, of plastic material with low coefficient of thermal expansion.

The invention will be described in more detail below with reference to a drawing, in which an exemplary embodiment 5 is shown.

Fig. 1 shows a thermostat element in longitudinal section.

Fig. 2 shows the thermostat element according to FIG. 1 in section over the plane II-II.

The thermostat element consists of a housing 1, which consists of a cup-shaped bottom part 2 and a concentric guide and a concentric holding member for a push pin 5> a disc 6 and a membrane 4 carrying top part 3. A displacer body 7 with spacer ribs ring is arranged in the cylindrical lower part 2 at a small distance from the wall of the housing 1. The spacing ribs 8 are formed in a number of four on the jacket face of the displacer body 7 and extend the distance dimension beyond both ends of the housing so that displacer body 7 is axial as well as radial in its center -r position in housing 1 is maintained. The thin-walled space between the housing 1 and the displacer body 7 is filled with an expandable material 9, for example. After the insertion of the expandable material 9 and the insertion of the displacer body 7 in the lower part and the placing of the membrane in the upper part, both parts are brought together and joined together by means of a conversion 10 on the part 2. .

When temperature changes occur in the vicinity of the thermostat thus produced, these are caused by the displacement body 7 in proportion to the large surface area. transferred directly to the expandable material 9 and thus cause a change in volume, which deforms the membrane 4 accordingly and thus shifts the push pin 5.

The membrane 4 in this case is made of rubber or a similar material and at the same time serves with its outer edge as a seal between the lower and the upper part 2, 3 in the region of the conversion 10. However, of course, instead of the rubber membrane a metal membrane can be used and the top part can be connected to the bottom part by welding. The displacer body 7 can advantageously be produced by die-casting from zinc or aluminum alloys or also from plastic material with a low coefficient of thermal expansion.

8101716

Claims (6)

Thermostat with an expandable material arranged in a substantially rigid housing which acts on a push pin through a membrane, characterized in that an incompressible displacer body (7) is arranged in the housing (1), the expandable material ( 9) forms on the house wall into a relatively thin layer. Thermostat according to claim 1, characterized in that the displacer body (7) is held in a central position in the housing (1) by means of spacers. Thermostat according to claims 1 and 2, characterized in that the displacer body (7) carries formed spacer ribs (8). Thermostat according to claim 3, characterized in that three or more spacer ribs (8) are formed on the lateral surface 15 of the displacer body (7), the spacer ribs (8) outside the front sides of the displacer body 7 over a distance from the housing (1) and thereby also hold the displacer body (7) axially in its position at a distance from the housing (1). 20 Thermostat according to claims 1 to 4, characterized in that the displacer body (7) is made of an aluminum or zinc alloy. Thermostat according to claims 1 to 4, characterized in that the displacer body (7) is made of a plastic material with a low coefficient of thermal expansion. --- 000O000 --- 810171 6