DE1958643U - TWO-POINT TEMPERATURE CONTROLLER. - Google Patents

Description

560 * 211166

ED. HiETIIII - 24.II.66

706I Schornbach near Schorndorf / Württ.

Description with eye protection

The application relates to a two-point temperature controller based on fluidic expansion with abstinence possibility on the Eegleraehse and adjustable switching differential, its expansion link directly on one Microswitch works.

In the case of temperature regulators of the usual design, the Target temperature between a minimum position and a maximum position infinitely variable on the controller axis * To shut off the Control circuit, however, a separate switch is required. That brings you additional effort in the circuit and a corresponding increase in price with it.

For hot water heating systems of all types for which the registered control device is mainly intended, there is almost always the need to the switching frequency (i.e. the number: of switching operations in the unit of time) and thus the control accuracy of the temperature controller after the local conditions, by adjusting the Sehaltdifferenz d. H. the Optimally adjust the difference in degrees between turning off the controller and turning it on again.

There are known temperature controllers in which by changing the transmission ratio the transfer lever between the expansion member of the Thermostat and actuator of the electrical switch contact the Switching differential, is adjustable.

Furthermore, an embodiment is known in which the contact spacing of the Switching contact and thus the switching differential of the controller by a can be changed on a pivotable lever.

In addition to the relatively large structural effort, these devices have the disadvantage that the switching differential is not accurate enough and can only be adjusted using a tool is.

Another disadvantage of the devices on the market is that that metal membranes or flat metal bellows with max.

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three shafts are used, which inevitably have a very small stroke result. In order to keep the friction within tolerable limits, the Lever bearings are carried out correspondingly expensive, apart from that, the size is essential due to the additional transmission elements influenced.

To avoid the disadvantages listed you need a temperature controller the following requirements are made for the above-mentioned purposes

Ability to shut off the control circuit on the temperature controller itself. The maintenance difference can be subsequently set manually with the built-in controller. Compact design and maximum accuracy, so that it warps on leverage between the thermostatic part and the electrical part of the Regulator.

These requirements are largely met in the device described below with reference to the drawing.

The device consists of two units, the holder housing made of insulating material (9) with the retaining spring (8) and the screwed-on sheet metal housing (14) which contains the thermostatic part. By means of a sensor attached to the material to be measured, a pressure is exerted in a known manner on the basis of liquid expansion via the capillary (I3) on the metal bellows soldered in the bellows housing (5) with a large number of waves. The resulting stroke on the bellows is transferred directly to the retaining spring (θ) via the adjustable push rod (6) and switch pin (7). ^:

To preselect the temperature, turn the control axis (2) using the rotary knob (l). turned. A threaded connection between the controller axis. (2) and the im. " Guide piece (4) axially guided bellows housing secured against rotation (5) results in the required adjustment movement of the bellows housing.

The control circuit is switched off by turning the controller axis (2) reached beyond the minimum position. The one on the controller axis (2) The attached cam (3) actuates the one in the guide piece (4) Push button (l2). This presses a leaf spring (ll) fastened on one side, the free end of which is recessed accordingly, onto the shoulder of the switch pin (?)

The maintenance difference is adjusted by turning the lever Adjusting screw (10) adjusted between two stop faces (15).

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Claims (1)

: - ■■ - te Claim to protection I »Single-pole two-point temperature controller based on liquid expansion with isolation possibility on the controller axis and adjustable switching differential, II. Characterized in that the disconnection of the Eegler contact j by additionally turning the control axle (2) over the temperature preselection area addition is effected. ■ ■ III, temperature controller according to claim I, characterized in that the Disconnection according to Claim II via a device attached to the Eegleraehse (2): Lock washer (5) is effected via an axially guided pressure ram (12) and a leaf spring (11) acting as a lever on one side actuates the switching pin (7) of the regulator contact. TV. Temperature regulator according to claim Iy, characterized in that the Sehaltdifferenz via a setting which changes the contact distance; screw (lO), the head of which with a between two stops (l5) | pivotable lever is provided, is effected. T. temperature controller according to claim I, characterized in that the The threaded portion of the adjusting screw (io) according to claim IT consists of a self-locking thermoplastic material. VI. Temperature controller according to.Anspruch I, characterized in that as A metal bellows with a large number of ellipses is used as the expansion element, the stroke movement of which directly acts on the solenoid spring without lever transmission (8) a microswitch is transmitted.