JPS6018764Y2 - Absorption chiller control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to flow control of an absorption liquid in a relatively small-sized dual-effect absorption refrigerator.

The circulation of absorption liquid and refrigerant in absorption refrigerators is carried out in some parts using liquid pumps, but in many parts the flow of liquid is ensured by utilizing pressure differences and head differences between various parts of the component equipment. .

Particularly in small absorption refrigerators, there are many parts that use pressure differences and head differences to circulate liquid, and natural circulation absorption refrigeration uses only pressure differences and head differences to ensure liquid circulation without using a pump. There is also a machine.

However, liquid circulation due to such pressure differences and head differences is structured so that it can only flow stably when the temperature and pressure conditions of the equipment that make up the absorption refrigerator reach steady operating conditions. In addition, the time required for the absorption chiller to reach a steady operating state after it is started (startup characteristics), or the dilution time (dilution characteristics) required to reduce the absorption liquid concentration in each part before stopping the operation of the absorption chiller. It was easy to be victimized.

In view of these points, the present invention is designed to particularly improve the startup characteristics and dilution characteristics of a dual-effect absorption refrigerator, and will be described below with reference to the drawings.

1 is a high-temperature generator that is heated by a combustion burner 2 and heats and separates a refrigerant from a dilute absorption liquid (hereinafter referred to as replacement liquid); 3 is a liquid lift pipe that sends out an absorption liquid using the gaseous refrigerant generated in the generator 1; 4; 5 is a separator that separates the absorption liquid and refrigerant that flow in through the liquid pumping pipe 3, and 5 further heats the refrigerant from the intermediate concentration absorption liquid (hereinafter referred to as intermediate liquid) using the refrigerant vapor sent out from the separator 4 as a heat source. 6 is a condenser that liquefies and cools the gaseous refrigerant flowing in from the generators 1 and 5 using a cooler 7; 8 is a condenser that uses latent heat when dispersing and vaporizing the liquid refrigerant from the condenser 6; The evaporator 9 uses a low-temperature generator 5 to maintain a low pressure inside the evaporator 8 by spraying concentrated absorption liquid (hereinafter referred to as concentrated liquid) from which the refrigerant has been separated, thereby continuously supplying cold water. 10 is a low-temperature heat exchanger, 11 is a high-temperature heat exchanger, and these are a refrigerant vapor pipe 12, a refrigerant liquid pipe 13, a dilute liquid pipe 15 having an absorption liquid pump 14, and an intermediate liquid A refrigeration cycle is configured by being connected by a pipe 16 and a concentrated liquid pipe 17.

18 is an absorption liquid pipe that connects the separator 4 and the low temperature generator 5 by bypassing the high temperature heat exchanger 11; 19 is an automatic valve attached to the absorption liquid pipe 18; and 20 is a controller that adjusts the opening degree of the automatic valve 19 according to the input from the temperature (or pressure) detector 21 installed in the separator 4.

In the absorption refrigerating machine of the present invention having such a configuration, when the absorption refrigerating machine is started, the automatic valve 19 is opened to a large degree while the temperature (or pressure) of the separator is low, so that the intermediate liquid in the separator 4 becomes the absorption liquid. It can be made to flow to the low temperature generator 5 through the pipe 18, and at startup, because the pressure difference between the separator and the low temperature generator is small, very little intermediate liquid flows, and a large amount of absorption liquid flows into the separator. This eliminates the drawback of this type of conventional absorption refrigerator, in which the circulation of the absorption liquid stops due to stagnation.

In addition, if the opening degree of the automatic valve 19 is set so that it closes as the temperature (or pressure) of the separator 4 increases, it is possible to prevent an amount of absorption liquid exceeding the required amount from accumulating in the separator 4.

Furthermore, when the absorption refrigerator is stopped, if the automatic valve 19 is opened while the temperature of the separator 4 is high, the intermediate liquid can quickly flow into the low temperature generator 5 and concentrated liquid pipe 17 side. This also improves dilution characteristics when the absorption refrigerator is stopped.

[Brief explanation of the drawing]

The figure is a circuit configuration diagram showing the structure of an absorption refrigerator according to the present invention. 1... High temperature generator, 4... Separator, 5
... Low temperature generator, 6 ... Condenser, 8.
...Evaporator, 9...Absorber, 18...
... Absorption liquid pipe, 19 ... Automatic valve, 21 ...
...Detector.

Claims (1)

[Scope of utility model registration request] A high-temperature generator that vaporizes and separates the refrigerant from the absorption liquid, a separator that separates the gaseous refrigerant and the absorption liquid, a low-temperature generator that separates the refrigerant from the absorption liquid using the heat of the refrigerant vapor flowing out from the separator, and a A condenser that liquefies and cools a refrigerant, an evaporator that uses the latent heat of vaporization of the refrigerant to obtain a cooling function, an absorber that absorbs vaporized refrigerant and maintains a low pressure inside the evaporator, etc. are installed using refrigerant pipes and absorption liquid pipes. The separator and low temperature generator are connected to form a refrigeration cycle, and the separator and low temperature generator are connected by an absorption liquid pipe made of automatic valve material, and the automatic valve is opened depending on the temperature or pressure inside the separator to release low temperature from the separator. A control device for an absorption refrigerator that bypasses the absorption liquid to the generator.