RU2519282C1 - Temperature stabilisation device - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: temperature stabilisation device of a temperature-controlled object contains a heater placed at the substrate with a temperature sensor and control system. The heater is equipped with a stand-by heating element with a temperature sensor. The control system is intended for regulation of temperature of a temperature-controlled object by means of switching on/off of heating element. The substrate can be represented by a body of a temperature-controlled object made of high heat-conductive material or by a high heat-conductive metal shell. The shell limits a temperature-controlled object. The main and stand-by heating elements have identical heat and geometric characteristics and they are placed at a dielectric base with s shift equal to a pitch of painted design. Auxiliary heaters with temperature sensors can be installed at the substrate.

EFFECT: expansion of functionality, improvement of operational reliability, quality of temperature stabilisation, in particular, for space distributed objects in a wide range of temperature changes.

6 cl, 2 dwg

Description

The invention relates to means for monitoring and controlling the temperature field of spatially distributed objects and can be used in automated control systems for thermal conditions in space rocket technology.

A well-known heater (RF patent for utility model No. 86372, IPC H05B 3/56, published August 27, 2009) of increased reliability, made of two heating cables that duplicate each other. Moreover, each cable is folded in half and twisted into a spiral so that there is an alternation of turns of the main and backup cables, but this heater is not intended for heating extended surfaces.

The closest is a device for stabilizing the temperature of elements of microcircuits and microassemblies (RF, patent for invention No. 2348962, IPC G05D 23/19, published on March 10, 2009). The device comprises a substrate, a temperature control circuit, and a temperature sensor and a heater electrically connected to it, located on the working surface of the substrate. The temperature sensor is located at the edge of the substrate. This device uses only one heating element, and when redundant heaters to increase reliability, it is impossible to obtain the identity of thermostating processes, installation of heaters is complicated. In addition, the high accuracy of temperature control is achieved only near the location of the temperature sensor, and sections of the substrate remote from the temperature sensor have a low accuracy of temperature control due to the finite size of the heater. At the same time, the use of only one heater and one temperature sensor in the device does not allow eliminating temperature differences that occur on the substrate.

The objective of the invention is to provide a device with enhanced performance characteristics.

The technical result consists in expanding the functionality, increasing the reliability and quality of temperature stabilization, in particular spatially distributed objects in a wide range of temperature changes.

This is achieved by the fact that the device for stabilizing the temperature of a thermostatically controlled object contains at least one heater located on a substrate with a temperature sensor and a control system. Unlike the known heater, it is supplemented by a backup heating element, which, together with the main heating element, are located on a thin dielectric base, in a flexible printed circuit board, under a protective insulating coating. The backup heating element is also equipped with a temperature sensor, the heater is rigidly fixed to the outer surface of the substrate, and temperature sensors for the main and backup heating elements are located on the inner surface of the substrate in the region of the geometric center of the heater. Moreover, the control system is designed to control the temperature of the thermostatically controlled object by turning on / off the power of the heating elements.

The substrate may be a body of a thermostatic object made of a highly conductive material, or a thin-walled highly conductive metal shell. The shell limits the temperature control object. The main and backup heating elements have identical thermal and geometric characteristics and are located on a dielectric base with a shift equal to the pitch of the printed pattern. Additional heaters with temperature sensors can be located on the substrate.

The invention is illustrated by drawings, where figure 1 shows a heater, and figure 2 control system.

The temperature stabilization device comprises a heater 1 (Fig. 1), which is a flexible printed circuit board on a thin dielectric base 2, on which the main 3 and backup 4 independent heating elements are located in the form of a conductive printed pattern of manganin foil 0.3 mm thick, closed with a protective insulating coating 5. A conductive printed pattern in the form of lines with a width of 1.1 mm and a distance between them of at least 0.1 mm ends with pads 6 that are not covered by an insulating coating. When electric current is passed through the printed conductors, heat is generated. The heater 1 is rigidly mounted on the outer surface of the substrate 7 with a dielectric base 2 using glue K-300-61. The substrate 7 is made in the form of a housing of a highly heat-conducting material or a thin-walled highly heat-conducting metal shell, which limits the temperature control object. The sizes, power and number of heaters 1 are selected based on weight and size characteristics and design features of the thermostating object. Temperature sensors 8 and 9 are installed on the inner side of the substrate 7 in the region of the geometric center of the heater 1, respectively, for the main heating element 3 and the backup heating element 4. Such an arrangement of temperature sensors makes it possible to obtain accurate temperature information inside a thermostatically controlled object. The contact area of the temperature sensor does not exceed 0.5 cm ² , which ensures the identity of the main and backup temperature sensors. The identity of the main heating element 3 and the backup heating element 4 and their close location allow the failure of the main heating element 3 or the temperature sensor 8 to connect the backup heating element 4 and the temperature sensor 9 without reconfiguration, which increases the reliability of the device. As temperature sensors, digital temperature sensors are used, manufactured by the DALLAS SEMICONDUCTOR company of the DS1820 or DS1624 series.

The control system (figure 2) contains a power supply 10, supplying voltage to the control unit 11 and the information processing device 12. In the control system, the power leads of the heating elements 3 and 4 of the heater 1 and temperature sensors 8 and 9 are connected to the outputs of the control unit 11, bidirectional the data bus of temperature sensors 8 and 9 is connected through the control unit 11 to the inputs of the information processing device 12, and the output of the information processing device 12 to the input of the control unit 11.

The temperature stabilization device operates in two modes.

In the measurement mode, after applying voltage from the power supply unit 10, the control unit 11 conducts periodic (with a period of P≈1 min) interrogation of temperature sensors 8 (when using the main heating elements 3) or temperature sensors 9 (when using backup heating elements 4). The measurement results via a bi-directional data bus are sent to the control unit and then to the information processing device 12, where the accumulation, processing and storage of the measurement results in the storage device takes place.

In the control mode, after polling the temperature sensors 8 or 9, the measurement results via the bi-directional data bus are sent to the control unit 11 and then to the information processing device 12, which analyzes the measured temperatures and generates control actions for the heaters 1 that are transmitted using a special algorithm for processing temperature measurements to the control unit 11, where commands for turning on / off the heaters are generated. The regulation principle is based on the heating of colder sections of the equipment. The criteria of the temperature regime is the permissible operating temperature range from T _min to T _max , with an allowable temperature difference between the given measurement points ΔT _add .

Thus, a reliable device for stabilizing the temperature of spatially distributed objects with high accuracy of temperature control and the quality of temperature stabilization in a wide range of temperature changes has been created.

Claims (6)

1. The device for stabilizing the temperature of a thermostatically controlled object, containing at least one heater located on the substrate, with a temperature sensor and a control system, characterized in that the heater is supplemented by a backup heating element, which together with the main heating element is located on a thin dielectric base, in a flexible circuit board, under a protective insulating coating, in addition, the backup heating element is also equipped with a temperature sensor, the heater is rigidly fixed to the outer surface of the substrate, and temperature sensors for the main and backup heating elements are located on the inner surface of the substrate in the region of the geometric center of the heater, and the control system is designed to control the temperature of the thermostated object by turning on / off the power of the heating elements. 2. The device according to claim 1, characterized in that the substrate is made in the form of a body of a thermostatically controlled object from a highly heat-conducting material. 3. The device according to claim 1, characterized in that the substrate is made in the form of a thin-walled highly conductive metal shell. 4. The device according to claim 3, characterized in that the highly conductive metal shell limits the temperature control object. 5. The device according to claim 1, characterized in that the main and backup heating elements are made with identical thermal and geometric characteristics and are located on the same dielectric base with a shift equal to the pitch of the printed pattern 6. The device according to claim 1, characterized in that additional heaters with temperature sensors are located on the substrate.

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