Method of controlling temperature in turbo refrigerator plant

FIELD: machine building.

SUBSTANCE: turbo refrigerator plant comprises, at least, one turbo refrigerator with motor communicated with refrigeration chamber accommodating air cooler and fan. In compliance with this invention, refrigeration chamber temperature is controlled by varying motor rpm. To freeze said chamber to preset temperature, motor rpm are increased from minimum to maximum together with switching fan on and reducing motor rpm from rated to minimum with simultaneous switching fan off on reaching preset temperature.

EFFECT: higher efficiency and reliability, longer life.

2 cl, 1 dwg

 

The invention relates to refrigeration, and in particular to a method of temperature control units with expansion turbomachines designed to produce cold.

The famous "Transport refrigeration unit on avtv of the USSR №1525035, B60H 1/32, F25D 19/00, 30.11.89, bull. No. 44, containing placed on the frame automated refrigeration unit, which includes installed inside the body of the fan to the cooler and out of the body compressor unit, condenser fan driven by belt transmission, and the drive motor of the compressor and the fan, the fan cooler is located on a common shaft of a drive motor, the cooler is installed coaxially with the fan, the compressor unit has two compressors, the axes of which are parallel, symmetrically located relative to the shaft above the motor and connected with it by means of the mentioned belt, and the capacitors are arranged coaxially with the compressor, the axes of which are fans of capacitors.

The disadvantage of the proposed refrigeration unit, as well as all the vapor compression refrigeration systems, is that the cooler (evaporator), mounted inside the body (the cooling chamber), has a temperature close to the boiling point of the refrigerant, which may be on the OST R 12.2.142-99 -4°C to -45,6°C and the leakage air flow on the cooled product from the cooler fan at zero temperature in the chamber (+12°C ÷ +2°C for transporting fruit, vegetables, flowers) there is damage products from the stream of cold air, which is in close proximity to the cooler.

The famous "Air cooling unit, expander electric compressor air refrigeration unit and the turbine wheel of the turbo-expander according to the patent of Russian Federation №2156929, F25 11/00, 28.12.1999, containing turbopropeller, including high-speed motor, on the shaft of which there are wheels refrigeration turbine and compressor, United air line in a closed loop with a freezer.

Cold in the famous turbodelta is formed due to the effect of expansion of the air in the turbine pre-compressed in the compressor. The heat exchangers serially included in the circuit system, provide cooling from compressor hot air, its regeneration and cooling down of the refrigerating chamber heat exchanger-cooler with a fan.

thermal control system maintains the required (specified) temperature inside the refrigerating chamber by incorporating the motor of turbodelta to tahaliyani of the refrigerating chamber to a predetermined temperature. This system turns off the motor when reaching this temperature. The method of regulating the temperature in the specified known turbolader the ICA is selected as the closest analogue declared.

The disadvantage of this method of regulation is that the temperature of the air coming from the cooling turbine air cooler, can reach up to -140°C, which can also cause damage to the products from the stream of cold air, which is in close proximity to the cooler.

The present invention is directed to overcoming the shortcomings of the methods of control are known in the prior art, and the creation of new ways specified destination, providing effective cooling down, and maintaining the desired temperature in turbodelta at safe levels to minimize the risk of damage to stored products and refrigeration equipment.

In the present method of controlling the temperature Turkological installation, comprising at least turbopropeller with an electric motor associated with refrigeration camera placed inside the cooler with fan, in which the regulation of the temperature of the refrigerating chamber is performed by changing the speed of the motor according to the invention for tahaliyani of the refrigerating chamber to a predetermined temperature increase of the motor speed of turbodelta from minimum to nominal with the simultaneous inclusion of the fan cooler and reduces the indicate the motor speed of turbodelta from nominal to minimum with a simultaneous shutdown of the fan of the cooler when the set temperature is reached.

Here and further in the framework of the present invention under a minimum value of revolutions of the motor of turbodelta understood the values of speed, which is not cooling down, cooling chambers, i.e. turbopropeller does not produce cold. Based on the data obtained by the authors of the experiments, this is achieved at speeds of approximately ¼ of the nominal obtained from experiments.

In the particular case of further maintain the desired temperature in the refrigerating chamber after it tahaliyani provide smooth control of the motor speed of turboalternator.

By reducing the motor speed of turbodelta with a simultaneous shutdown of the fan cooler in the claimed method provides a supply of cold air in the refrigerating chamber when reaching into her set temperature. On the contrary, when there is a need to reduce the temperature of the cold air in the chamber can be effectively achieved by increasing the speed of the motor from the minimum value up to par with the simultaneous switching of the fan on the cooler.

Unlike the prior art, this allows you to efficiently regulate the temperature in the chamber with a tolerance in the range of 1-2°C. At this temperature the air in the cooler may be different from the temperature in the chamber is not more than 2-3°C, that will not lead to spoilage of foods from hypothermia. When the temperature in the refrigerating chamber from the target (for example, -20°C) for 1-2°C in one direction or another using known at the current level of technology tools, in particular temperature sensors, may be fed to the motor of turboalternator (the controller of the source of his power), and low (smooth) change of its momentum will be achieved by increasing or decreasing the cooling capacity of turbodelta and bringing the temperature in the chamber to a preset value (for example, -20°C).

While in comparison with the prototype of the claimed method of thermal control allows you to increase the resource, for example, radar, aircraft gas-dynamic bearings, as it reduces the number of start-UPS and shutdowns of the refrigeration unit, which reduces bearing wear due to friction on the shaft of turboalternator.

The invention is illustrated hereinafter in more detail a specific example of its implementation with reference to the attached drawing, which shows a schematic diagram Turkological installation to implement the claimed method in this case.

As shown in the drawing, WTJU contains turbopropeller, including high-speed electric motor (7), on the shaft of which there are wheels refrigeration turbine (6) the compressor (1), United air line closed-loop cooling chamber (3). Cold in turbodelta is formed due to the effect of expansion of the air in the turbine (6), pre-compressed in the compressor (1). Heat exchangers(2), (4), (9), consistently included in the path system, provide cooling coming from the compressor (1) hot air, its regeneration and cooling down, cooling chamber (3). Fans (5) and (10) provide for venting of the heat exchanger (4) and (9) the ambient air. The temperature sensor (11) sends a signal to the controller power supply (8), by adjusting the speed of the motor (7) of turbodelta and thereby supports the required (specified) temperature inside the refrigerating chamber (3).

Cooling down the cooling chamber (3) to a predetermined temperature is carried out by increasing the speed of the motor (7) of turbodelta from minimum speed (typically ¼ of the nominal - 20-30 thousand rpm) to nominal (60-120 thousand rpm) with simultaneous switching of the fan (5) of the air cooler (4) of the refrigerating chamber (3). When the temperature sensor (11) sends a signal to the controller power supply (8), by adjusting the speed of the motor (7) of turbodelta, and thereby supports the required (specified) temperature inside the refrigerating chamber (3). When reaching into Ho is Tilney the camera (3) the required temperature the temperature sensor (11) sends a signal to the controller power supply (8) and the motor (7) of turbodelta and reduces the speed of the motor from nominal to minimum with a simultaneous shutdown of the fan (5) of the air cooler (4) of the refrigerating chamber (3).

Maintaining a predetermined temperature in the cooling chamber (3) when it changes the value of ±2÷3°C is smooth (slight) increase or decrease in speed of the motor (7) of turbodelta by changing its cooling capacity, which depends on the speed of the motor (7).

It should be noted that the described example should not be construed as limiting the amount requested protection, which is completely determined solely by the attached claims.

1. The method of controlling the temperature Turkological installation, comprising at least turbopropeller with an electric motor associated with refrigeration camera placed inside the cooler with fan, in which the regulation of the temperature of the refrigerating chamber is performed by changing the speed of the motor, characterized in that for tahaliyani of the refrigerating chamber to a predetermined temperature increase of the motor speed of turbodelta from minimum to nominal with the simultaneous inclusion of the fan cooler and reduce the motor speed of turbodelta from nominal to minimum with a simultaneous shutdown of the fan Vozduha is adites when the set temperature is reached.

2. The method according to claim 1, wherein maintaining the set temperature in the refrigerating chamber provide smooth control of the motor speed of turboalternator.



 

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FIELD: machine building.

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FIELD: machine building.

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1 dwg

FIELD: machine building.

SUBSTANCE: turbo refrigerator plant comprises, at least, one turbo refrigerator with motor communicated with refrigeration chamber accommodating air cooler and fan. In compliance with this invention, refrigeration chamber temperature is controlled by varying motor rpm. To freeze said chamber to preset temperature, motor rpm are increased from minimum to maximum together with switching fan on and reducing motor rpm from rated to minimum with simultaneous switching fan off on reaching preset temperature.

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EFFECT: invention is aimed at the refrigeration efficiency increase and environment protection improvement.

2 cl, 1 dwg

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