SU666523A1 - Manometric heat relay - Google Patents

Description

(54) MONOMETRIC TERMORVEL

The invention relates to the field of instrumentation, namely, to sensors with a pressure thermometer system, and is a pressure thermostat with a base temperature failure.

A thermostatic thermostat is known, which contains a thermal system, including a thermal bulb, a remote capillary tube, and an elastic sensitive object filled with a filler, as well as setting sags and switches of electrical contacts ij,

In such a thermal switch, when the filler leaks, the ksetakty opens, due to the fact that a stop is located in the swing area of the shift lever, which, when the pressure drops as a result of the filler leakage, forms a fulcrum for the lever, and the lever changes the direction of the switch.

A disadvantage of the known device is the need to use part of the working stroke of the elastic element.

to ensure its constant tension, which reduces the sensitivity of the device and the range of controlled temperatures. in addition, the regulator does not provide a safe failure in case of partial leakage of the filler, as well as in case of failure of other elements.

The closest to the technical essence of the invention is a pressure thermo-switch containing a thermal bulb connected by a remote capillary tube with an elastic sensitive element connected to switch 2.

Claims (3)

This thermal switch, in addition to the main contacts used for regulation, contains additional contacts held in the closed position by a fusible metal safety plate. In case of failure of the controller and the temperature of the object above a predetermined value, the plastic melts and the additional contacts open, interrupting the power supply circuit. what provides .safe failure thermorepe. Such a thermorepe cannot be used with a remote control of temperature, for example, in gauge thermostats with a remote thermal system. This thermostat can be used as a chamber device, i.e. The whole ryrynffrop should take the temperature of the object. At high temperatures and in a number of other cases, the thermostats are built with a remote temperature sensor, and it is impossible to ensure their safe failure by known technical means. The aim of the invention is to improve the reliability of a thermal relay by providing a safe-failure pressure gauge thermostat with remote temperature control. The goal is achieved by the fact that the proposed thermal switch contains a spring, a safety element made of a material with a predetermined melting rate, and a cable, one end of which is attached to a thermal bulb with the aid of a safety element and a spring connected to a switch. The drawing schematically depicts a manometric thermorepe with a safe failure. The manometric TepMqjene contains a temperature-sensitive system consisting of an elastic sensing element (syphon) I, a remote capillary tube 2, and a thermal bulb 3, which are filled with a heat-sensitive working medium (liquid or gas). Element 1- is installed in housing 4, in which the spring 5 is placed, I support ntasica on the transfer lever 6, connected via the spring element 7 to the off lever 8, acting through the stop 9 on the switch. The latter consists of an elastic plate Yus with a movable vector contact 11, a contact sleeve with a fixed electrical contact 12. The fail-safe failure of the thermal relay is ensured by the spring 13 held in a compressed state by the flange 14, which is pressed to the spring fixed on it by a cable 15 placed in the tube channel 2. The other end of the cable is fixed on the thermowell 3 by means of a safety element consisting of a flange 16, which is supported through an anchoring ring 17 on the protrusions of the walls of the ternalponon. 3. The ring 17 is made of a melt with a closed melting tekteture. Gauge thermal relay works in the following way. When the object’s thermocouple 3 is changed, the pressure or volume of the filler changes in it, which is transmitted to element 1 through tube 2. Element I expands as the temperature of the object increases and opens contacts 12 and 13 through stop 9 by reversing lever 8 with the spring element 7 after the transition of the unstable equilibrium position by the lever 6. When the temperature decreases, the elastic element 1 is compressed by the spring 5, and the lever 8 is moved to the initial position from the stop 9 on the support in the housing, and the contacts 11 and 12 are closed due to the elasticity of the plate 10. Thus, during normal operation, the thermal relay 13 does not displace the element 1. But in the event of a complete or partial leakage of the filler from the thermal system, as well as in other emergency situations that caused the TeNffering of an object above a certain permissible value, the retaining ring 17 melts and the cable 15 releases the spring 13, to torus, expands to, forcibly expands the element 1 and rotates the lever 6 so that the contacts 11 and 12 are opened forcibly. In this case, the force of the spring 13 is chosen greater than the total force of the spring 5. and element 1. Thus, a safe failure of the thermal relay is ensured, in particular when the filler leaks. The technical and economic efficiency of the invention consists in a substantial increase in the reliability of the thermostatic thermostats, as well as in the elimination of the need to install additional safety devices at the facilities. Claims of the invention A thermostatic thermostat comprising a thermal bulb connected by a remote capillary tube with an elastic sensitive element associated with a switch, characterized in that, in order to increase the thermal relay, it contains a spring, a safety element extracted from the material with melting point, and a cable, one end of which is attached to a bulb by means of a safety element, and the other end to a spring connected to a switch. /five / 7/6 3 Sources of information taken into account during the examination 1. German patent I 21088О9, cl. O-05 D 23/12, 1972, 2. French Patent No. 2239751, cl. H O1 H 37 / OO, 1975.