Apparatus for stabilising air temperature of altitude test chamber

FIELD: physics.

SUBSTANCE: apparatus for stabilising temperature in an altitude test chamber has series-connected thermoelectric modules and heat exchanger radiators, digital-to-analogue converters with a current output, a temperature sensor and a pressure sensor. By using thermoelectric modules to stabilise air temperature in an altitude test chamber, the present invention enables to achieve high quality of installing and controlling temperature regulators since all mechanical elements of the temperature regulators are not exposed to temperature fluctuations.

EFFECT: stabilising temperature in an altitude test chamber when controlling temperature regulators to reduce additional error in operation of the temperature regulators and preventing forbidden deformation of the bellows of the temperature regulators.

1 dwg

 

The invention relates to the field of test and output control thermostats with sensitive gauge elements including a temperature sensitive element and the bellows is filled with vapor-liquid mixture of propane, spring master devices and actuators in the form of the contact groups, is intended for performance evaluation of controllers for mass production and can be used to assess the functioning of the controllers of the specified type at different points in time under normal conditions of control.

Known invention "Device settings of the sensors relay the temperature vapor-liquid filler", 17222 EN U1, publ. 20.03.2001, containing a control unit, associated electric lines with a manual screwdriver, with contacts configurable relay-sensor and temperature with a thermocouple cooling bath having a fixed temperature, characterized in that the device has a sealed lid, which houses the mechanical screwdriver, and which can be summed up with solenoids pneumatic supply line and air vent and electromanometer associated electric lines to the control unit.

The disadvantage of this device is the lack of temperature control in the chamber, which is necessary for kachestvennostju thermostat to reduce error settings which may be caused by a deviation of the air temperature in the chamber from the normal temperature.

The closest is "Device test output parameters of the sensors relay the temperature vapor-liquid filler", EN 63063 U1, publ. 10.05.2007, containing a pressure chamber, consisting of a cooling bath with a fixed temperature, which is controlled by a thermocouple, and a sealed cover. Inside the pressure chamber for connection of sensors-temperature switch is located contact device, a pneumatic supply line and discharge air pressure controlled by the pressure transducer associated electric lines with unit management, is connected to a personal computer. The pressure in the chamber change according to a certain law, when thermostat is fixed, in accordance with the dependence of T(p) gain temperature operation of thermostats and make a conclusion about their suitability.

A disadvantage of this device is the lack of temperature control in the chamber. Temperature control in the chamber is necessary, because its value must be always higher than the temperature of the cooling bath. This is a necessary condition for the presence of a liquid phase propane in the heat-sensitive element of thermostat. Otherwise, when the temperature is aerocamera below the temperature refrigerated baths, under the influence of excess pressure in the pressure chamber can happen unacceptable deformation of the bellows thermostat, which can cause a change in its mechanical characteristics (Weinstein E, Low-temperature refrigeration / [Text] Weinstein E, Kantorovich V. - M.: Publishing house"Food industry", 1972. - 342 C., str). Thus the deviation of the temperature in the chamber from the accepted normal value (20C) causes an additional error response contact groups controlled thermostat because the temperature dependence of the linear dimensions and mechanical properties of the elements defining and executing device.

Instability temperature in the chamber is the high rate of change of pressure. They cause an additional change in air temperature in the chamber: heating associated with spent outside working on the compression of air at the discharge pressure in the pressure chamber, cooled by expansion works at the discharge of air from the chamber.

The problem to which the invention is directed, is to stabilize the temperature in the chamber during testing thermostats to reduce additional error operation of thermostats and exceptions invalid deformation of the bellows thermostats.

The task of dostigao is the, the device stabilizing the temperature of the air in the pressure chamber containing a pressure chamber, consisting of a cooling bath with a fixed temperature, which is controlled by the temperature sensor, and a sealed cover within which to connect sensors-temperature switch is a contact device, a pneumatic supply line and discharge air pressure controlled by the pressure sensor, and controlled by solenoids associated electric lines with unit pressure regulation, connected to a personal computer equipped with an additional temperature sensor air pressure chambers, two thermoelectric devices, each of which consists of two heat exchangers air coolers and thermoelectric module, with one thermoelectric device is placed in the air pressure chamber, the second in the cooling bath, one of the radiators of each thermoelectric device remains in the outdoor atmosphere, and to each thermoelectric module, thermoelectric devices summed d / a Converter with a current output connected to a personal computer.

The invention is illustrated by the drawing, which shows the proposed device.

Device for stabilizing the temperature in the bar is the camera contains connected in series thermoelectric modules 16-17 and radiators heat exchangers 18-21, digital-analog converters with current output 11-12, the temperature sensor 10 and the pressure sensor 9.

For ease of description figure 1 presents one thermostat.

The device operates as follows.

Controlled thermostat 1 is placed in the air 2 chamber 3, the sensing element is immersed in the cooling tank 4. The air pressure in the chamber change according to a certain law in accordance with a modification of the controller through the control pressure of 5, which is connected by electric lines to the solenoids 6 and chokes 7, connected to the pneumatic supply lines and air vent. At the moment of closing of the contact group of thermostat 1, the program contained in the computer 8 determines the appropriate temperature operation of thermostat and concludes that it is suitable.

The control program residing in the computer 8, monitors the temperature and pressure in the chamber using the temperature sensor 10, the pressure sensor 9 and an analog-to-digital converters 11, 12 through the interface unit 13.

The control program on the computer 8 is connected with d / a converters 14, 15 with current outputs, and to stabilize the air temperature and the temperature of the cooling bath changes the value of the current flowing through turmoil kricheskii modules 16, 17. Depending on the magnitude and direction of the current is heated or cooled heat exchangers 18, 19, and the heat exchangers 20, 21 are placed into the external environment. The fans 22 and 23 are designed to enhance heat transfer.

The proposed device eliminates fluctuations in air temperature in the sealed chamber through the use of thermoelectric modules.

The advantage from the use of thermoelectric modules as a controlled source of heat in the proposed device, compared to the other is seamless and precise temperature regulation due to changes in the constant electric current flowing through the module. This is easily accomplished the transition from the heating mode to the cooling mode by changing the direction of electric current.

This invention allows for the use of thermoelectric modules for stabilizing the temperature of the air in the chamber to achieve high quality settings and control thermostats, because all the mechanical elements of thermostats is not exposed to fluctuations in temperature.

Device for stabilizing the air pressure chamber containing a pressure chamber, consisting of a cooling bath with a fixed temperature, which is controlled by the sensor is temperature, a sealed cover within which to connect the sensors relay temperature are the contact device, a pneumatic supply line and discharge air pressure controlled by the pressure sensor and controlled solenoids associated electric lines with unit pressure regulation, connected to a personal computer, wherein is further provided with a temperature sensor air pressure chambers, two thermoelectric devices, each of which consists of two heat exchangers air coolers and thermoelectric module, with one thermoelectric device is placed in the air pressure chamber, and the second in the cooling bath, one of the radiators of each thermoelectric device remains in the outdoor atmosphere, and to each thermoelectric module, thermoelectric devices summed d / a Converter with a current output connected to a personal computer.



 

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