SU787874A1 - Heat transfer apparatus - Google Patents

Description

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The invention relates to heat and mass transfer and can find wide application in the technique for heating, cooling or thermostating various. objects.

A heat transfer device is known, which contains a closed circulation circuit with inlet and outlet valves, in which a evaporator, a condenser and a reservoir partially filled with gas 1 are included.

The disadvantage of such a heat transfer device is the inability to control the temperature mode of operation of the dosing of the supply of the working bone to the evaporator.

The purpose of the invention is to increase the operational reliability

This goal is achieved in that the device additionally contains a compressed gas receiver, and the reservoir is divided by means of a floating piston with an elastic diaphragm into a gas and liquid cavity, the gas cavity communicating with the receiver and an adjustable height stop is installed coaxially with the piston, and the exhaust valve is equipped with choke cyclic supply of the working fluid in the circuit.

The drawing shows a diagram of the device.

The device contains a closed circulation loop filled with working fluid, in which the evaporator 1 is connected to the condenser 2 by the steam line 3, the tank 4 partially filled with gas, connected to the evaporator 1 and the condenser 2 by pipes 5 and 6 with the inlet and exhaust valves 7 and 8 respectively .

The inlet valve 7 is equipped with a choke 9 for cyclic supply of the working fluid to the circuit, and the tank 4 is divided by means of the floating piston 10 with the elastic diaphragm 11 into the gas and liquid cavities 12 and 13, respectively. stately. The gas cavity 12 of the reservoir 4 through the pipeline 14 and the valve 15 communicates with the receiver 16 of the compressed gas, and in it, the stop 17, which is height-adjustable, is installed coaxially with the piston 10.

Heat transfer device operates as follows.

Before starting, a certain pressure or gas pressure is created in the gas cavity 12 of the tank 4, which determines the temperature of the device, for which the valve 15 is set to the position in which the gas cavity 12 of the tank 4 communicates, or with the receiver 16 of the compressed gas, with a pressure reducer or with a vacuum pump (not shown). When the required pressure in the tank 4 is reached, the valve 15 is closed.

When thermal energy is supplied from any source to the evaporator 1, the working fluid in it is heated and boils. The resulting vapor displaces the liquid from the steam line 3 and the condenser 2 through the pipe 5 and the flow valve 8 opened by the flow of liquid into the tank 4, while compressing the gas in the gas cavity 12. The liquid inlet closed by the pressure in the tank 6 displaces the liquid into the tank 4 valve 7. When the steam begins to condense, the pressure in the condenser 2 drops, and accordingly in the evaporator 1 ..

Due to the resulting pressure difference between the steam condenser (evaporator, condenser and steam line) and tank 4, the exhaust valve 8 is closed, and the inlet valve 7 is opened and the piston 10 under the pressure of gas displaces the liquid from the tank 4 through the inlet valve 7 and pipe 6 to evaporator 1.

The flow of working fluid to the evaporator 1 intensifies the process of condensation of the remaining steam, increasing the pressure difference and thereby the flow of working fluid. An increase in the pressure difference will lead to an additional movement of the inlet valve 7, while the throttle 9 will partially or completely block the outlet in the inlet valve body 7. The evaporator will stop filling and the resulting vapor from the injected liquid will raise the pressure in it.

When the pressures in the evaporator 1 and in the tank 4 are equalized, the exhaust valve 8 closes, opening the outlet opening of the throttle 9 in the valve body 7 and the cycle repeats.

If it is necessary to increase the temperature of the coolant (steam) entering the condenser 2, it is necessary to increase the gas pressure in the gas cavity 12 of the tank 4 by a corresponding value. For this, the valve 15 is set to a position in which the gas cavity 12 communicates with the receiver 16. The pressure is set by the pressure reducer, after which the valve 15 is closed.

In the case of operation of this device in the cooling mode of an object whose temperature is below the boiling point of the working fluid at ambient pressure, in the gas cavity 12 of the tank 4, it is necessary to create a vacuum of the depth at which boiling of the liquid begins in the evaporator.

The presence in the tank 4 of the piston 10 with an elastic diaphragm 11, separating the gas medium from the working fluid, prevents possible penetration of gas 5 into the working zones of the valves and further into the pipelines when the orientation of the device changes in the gravity field.

Height-adjustable stop 17, limiting the movement of the piston 10 0 in the direction of the gas cavity of the tank. 4, allows, if necessary, to put into operation both the whole / and some of the capacitor 2.

Such a design of the heat transfer device ensures its reliable operation with an arbitrary orientation in the gravity field and with a change in the heat removal rate from the condenser surface, as well as an adjustment of the operating mode.

Claims (1)

1. USSR author's certificate 55 542085, cl. F 28 D 15/00, 1972. 9 -7 3 Iff /