RU16201U1 - TEMPERATURE CONTROL DEVICE - Google Patents

Description

The utility model relates to measuring equipment and can be used in instrumentation in temperature sensors, for example, for refrigeration and frying equipment.

Known temperature regulator according to ASSSSR N1057930 (publ. 30.11.83, bull. N44), containing a thermocylinder connected by a capillary to an elastic element connected through a first lever pivotally mounted in the housing with a tuning screw installed in it, with a contact switch, and a tuning mechanism made in the form of a profile cam with an axis and two parallel platforms and fixed in the groove of the housing with the possibility of longitudinal movement and connected through the second pivotally mounted and parallel to the first lever with an elastic element . The temperature controller has the following disadvantages: instability of operation and departure of the settings due to the mounting of levers on the hinges, which have necessarily constructive clearances and wear out quickly; the impossibility of installing the stops of the elastic element - the membrane without distortions; quick wear of the profile cam and the upper lever in the places of their slip; increased deformation of levers during operation and overloads as a result of the natural inertia of the environment when it is heated and, as a result, a short service life. For the above reasons, the thermostat did not find application.

The closest in design to the proposed device is a temperature control device according to the patent of the Russian Federation N2130197 (publ. 10.05.99, bull. N13), containing a housing in which there is a thermal system consisting of a thermowell, a capillary and an elastic element, a setting screw, which has the opportunity axial displacement in the housing.

a micro switch and a switching lever, pivotally mounted on the one hand in the housing, and on the other hand, drawn by a compensation spring, which is rigidly connected to the housing at one end. The device additionally contains 1 piece another tuning screw, also having the possibility of axial movement in the housing, and an elastic element is installed between the tuning screws. The temperature control device according to the RF patent N2130197 has the following disadvantages: instability of operation and deviation of the settings, the longer the operating time, the greater this deviation from the manufacturer’s settings, which reduces the life of the device as a whole.

The purpose of the utility model is to increase the stability of the response parameters by temperature and increase the service life.

This goal is achieved by the fact that in the lower part of the elastic element there is a stop located on the axis of the coil spring sandwiched between the elastic element and the housing to stabilize the position of the elastic element and acting directly on the contact spring of the microswitch, the elastic tongue of which abuts the housing and creates a spring force from a point supporting the tongue of the contact spring into the housing towards the switching group of contacts, and free axial movement of the contact spring of the microswitch additional compensatory bending, increasing the degree of freedom of axial movement at the point of contact with the stop of the elastic element of the thermal system more than its axial movement until the microswitch is activated by the amount of possible movement of the stop of the elastic element of the thermal system after the microswitch is activated.

The figure shows a schematic diagram of the proposed device.

The temperature control device comprises a housing 1, in which a thermal system is located, consisting of a thermocylinder 2, a capillary 3 and an elastic element 4 with stops 5 and 6, in the upper part of which the stop 5 is in contact with a setting screw 7, which is axially movable in a rigidly connected housing 1 nut 8., and in the lower part of which an abutment 6 located on the axis of the coil spring 9 sandwiched between the elastic element 4 and the housing 1 to stabilize the position of the elastic element 4, acts directly on the support point of the contact springs Microswitch 10, the resilient tongue which abuts against the housing 1 and creates dots springing force of the support tongue of the contact spring 10 in the housing 1 in the direction of the switching contact groups 11.

The proposed device operates as follows.

The thermal bulb S is installed in an environment whose temperature must be controlled. Rotating the adjusting screw 7 adjusts the device to the required operating temperature T of the microswitch. When the ambient temperature rises to T, the heat-sensitive fluid in the thermal system expands, the elastic element 4, pressed by the spring 9 stabilizing its position, moves the support point of the contact spring 10 of the microswitch down and stops (or closes) by the value of h, depending on the purpose of the proposed device ) switching group of contacts 11. Due to its inertness, the electric heater continues to increase the ambient temperature for some time. However, there is no overload and deformation of the contact spring 10., since it is at the point of pressing by the stop 6 of the elastic element 4 has the possibility of further movement up to the value H. A prerequisite is that the movement of the contact spring at the point of pressing H should be greater than h. The maximum value of H is limited by the minimum dimensions of the housing 1.

The elastic tongue of the contact spring 10, creating a spring force F holds the micro switch and emphasis 6 of the elastic element 4 in constant contact and in a dynamic state.

When the ambient temperature decreases, the thermosensitive fluid in the thermal system is compressed, the point of pressing of the contact spring 10 moves up together with the stop 6 of the elastic element 4, and closes (or opens, depending on the purpose of the proposed device) the switching group of contacts 11.

Due to the fact that the proposed device does not have an intermediate, pivotally mounted in the housing, the switching lever and the stop of the elastic element of the thermal system acts directly on the contact spring of the microswitch, the elastic tongue of which abuts the housing and creates a spring force from the stop point of the tongue towards the switching group of contacts, and free axial movement of the contact spring of the microswitch, having an additional structural bend, increasing the degree of freedom of axial movement, to the point e of its contact with the stop of the elastic element of the thermal system, more than its axial movement until the microswitch is triggered by the value of the possible movement of the stop of the elastic element of the thermal system after the microswitch is triggered, the control device has high stability, temperature response parameters and better performance compared to known devices of such a type.

At the moment, Orelks Orlovsky CJSC is developing technical documentation for the mass production of a temperature control device.

Claims (1)

A temperature control device comprising a housing in which a microswitch is located, a thermal system consisting of a thermowell, a capillary and an elastic element with an emphasis in the upper part in contact with a setting screw having the possibility of axial movement in a nut rigidly connected to the housing, characterized in that the lower part of the elastic element there is a stop located on the axis of the coil spring, sandwiched between the elastic element and the housing to stabilize the position of the elastic element, and acting directly on the contact spring of the microswitch, the elastic tongue of which abuts against the housing and creates a spring force from the fulcrum of the tongue of the contact spring in the housing toward the switching group of contacts, moreover, the free axial movement of the contact spring of the microswitch having an additional compensation bending that increases the degree of freedom of axial movement at its point contact with the stop of the elastic element of the thermal system, more than its axial movement until the microswitch is triggered by the amount of possible displacement of the stop of the elastic element of the thermal system after the operation of the micro switch.