JPS6017640Y2 - Absorption chiller refrigerant freeze prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refrigerant freeze prevention device for an absorption refrigerator.

In conventional absorption refrigerators that do not have a refrigerant circulation pump in the evaporator, refrigerant from the condenser is distributed to the evaporator via a frozen liquid down pipe.

The refrigerant temperature in the condenser is about 40°C1, and when it is sprayed in the evaporator, the saturation pressure in the evaporator, absorber and saturator is 6 mmHg, and self-evaporation occurs until the temperature reaches 4°C. be scattered.

However, the amount of condensed refrigerant changes depending on the load conditions and heat input conditions.
When cooling water conditions are added to this, the self-evaporation effect causes supercooling, and the refrigerant freezes near the evaporator outlet.

On the other hand, the only condition from the outside of the absorption chiller is that there is almost no refrigeration output, and heat is input by the control and heated by the generator, but the concentration of the absorption liquid increases and there is no heat absorbed by the absorber, so the cooling water temperature decreases. The problem of crystals forming on the concentrated liquid side occurs without the refrigerant being dripped into the evaporator.

This proposal has been made in view of the above points, and the embodiments shown in the drawings will be described below.

1 is a generator that heats and separates the refrigerant from the dilute absorption liquid using the heater 2; 3 is a condenser that has a built-in cooler 4 and condenses and cools the gaseous refrigerant that flows in from the generator 1; 5 is the condenser. An evaporator that uses the latent heat generated when the liquid refrigerant flowing in from 3 is dispersed and vaporized to obtain cold water for cooling from a water cooler 6; 7 is a concentrated absorption liquid from which the refrigerant has been separated in the generator 1; The absorber 8 maintains the inside of the evaporator 5 at a low pressure by absorbing the refrigerant vapor inside the vessel, thereby making it possible to continuously supply cold water. A solution heat exchanger for performing exchange, which includes a liquid refrigerant flow down pipe 9, a dilute absorption liquid pipe 11 with an absorption liquid pump 10, and a concentrated absorption liquid pipe 1.
2 to form a refrigeration cycle.

A heat exchanger 13 exchanges heat between the liquid refrigerant flowing down from the condenser 3 to the evaporator 5 and the cold water flowing through the water cooler 6 of the evaporator 5. One end is connected to a cold water inlet pipe 15 via an on-off valve 14, and the other end is connected to a chilled water outlet pipe 16. It is controlled in response to the sensor 17.

In this case, when the liquid refrigerant flowing down from the condenser 3 to the evaporator 5 approaches freezing temperature, a signal from the refrigerant temperature sensor 17 opens the on-off valve 14 to flow cold water into the heat exchanger 13 to exchange heat with the liquid refrigerant. to prevent it from freezing.

The same effect can be obtained even if the on-off valve 14 and the refrigerant temperature sensor 17 are omitted and cold water is constantly allowed to flow through the heat exchanger 13.

As described above, the present invention is an absorption refrigerator configured by connecting a generator, a condenser, an evaporator, an absorber, and a solution heat exchanger with piping, in which heat is exchanged with cold water in the refrigerant piping from the condenser to the evaporator. Since it is equipped with a heat exchanger, the load,
Even if conditions, heat input conditions, or cooling water conditions change, freezing of the liquid refrigerant supplied to the evaporator can be prevented, and crystallization of the concentrated absorption liquid can also be prevented.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an absorption refrigerator equipped with the device of the present invention. 3... Condenser, 5... Evaporator, 6...
...Cooler, 9...Liquid refrigerant flow pipe, 13.
·····Heat exchanger.

Claims (1)

[Scope of utility model registration request] In an absorption refrigerator configured by connecting a generator, a condenser, an evaporator, an absorber, and a solution heat exchanger with piping, a heat exchanger for exchanging heat with cold water is provided in the refrigerant piping from the condenser to the evaporator. A refrigerant freeze prevention device for an absorption refrigerator, which is characterized by: