JPH0215788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator in which the capacity of the refrigerator can be easily controlled according to the load.

Conventionally, the control method for small absorption refrigerators during partial load has simply been to control the combustion system that heats the dilute absorption liquid in the generator.
The amount of liquid circulated was not controlled.

This is because the circulation cycle of the refrigerant and absorption liquid that make up the absorption refrigerator are both formed in a vacuum section, so when using a control valve or movable damper to adjust the amount of circulation of such liquid, the airtightness must be adjusted. It requires the use of expensive parts, making it difficult to use in small, small-capacity absorption refrigerators due to cost considerations. Furthermore, controlling the amount of liquid circulated is not possible due to vacuum-proof issues and maintenance services. OFF control has been adopted, and three-position control (strong, weak, and off) has been adopted only for the combustion system of the generator, which is a non-vacuum part.

In view of these points, the present invention provides an absorption system that can be applied to small-sized absorption refrigerators at any time to control the amount of circulating fluid without changing the airtightness of parts, vacuum resistance, or adding large-scale control equipment. It provides refrigerators.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a high-temperature generator that heats a dilute absorption liquid using combustion gas such as gas or oil; 2 is the high-temperature generator; 1 is a separator that separates the gaseous refrigerant and absorption liquid from the dilute absorption liquid that has been heated and ascended through the pumping pipe 3; 4 is a separator that further heats the intermediate absorption liquid using the refrigerant vapor separated in the separator 2 as a heat source; A low-temperature generator to be separated; 5 is a condenser that cools and condenses the refrigerant flowing from the generators 1 and 4 in a cooler 6; 7 uses latent heat when dispersing and vaporizing the liquid refrigerant from the condenser 5; 9 is a bubble pump that returns the liquid refrigerant that has not been vaporized in the evaporator 7 to the evaporator 7; 10 is a generator 1, 4; The inside of the evaporator 7 is maintained at a low pressure by scattering a concentrated absorption liquid from which the refrigerant has been separated and absorbing the refrigerant vapor inside the vessel;
The absorber 11 that can continuously supply cold water has an on-off valve 12, and by opening the on-off valve 12 during heating, the high temperature refrigerant from the separator 2 is transferred to the evaporation absorption shell 13 together with the absorption liquid. 14 is an absorption liquid pump that returns the diluted absorption liquid sprayed in the absorber 10 to the generator 1 during heating and cooling. (canned pump), 15 and 16 are heat exchangers that exchange heat between the low temperature absorption liquid returning from the absorber 10 to the generator 1 and the concentrated absorption liquid flowing down from the generator 1 to the absorber 13. 17, 18, absorption liquid pipe 19, 20,
21, liquid lift pipe 3, and bypass pipe 11 to form an airtight circulation cycle of refrigerant and absorption liquid.

As shown in the performance curve of the absorption liquid pump 14 used in the absorption refrigerator of the present invention, for example, as shown in FIG. A reversible pump with variable pump head is used. For example, while the liquid circulation rate is 100% in forward rotation, it is 60 to 40% in reverse rotation.
% liquid circulation amount.

In the absorption refrigerator of the present invention configured as described above, when a decrease in temperature control load such as air conditioning is detected by the temperature detectors 22 and 22' attached to the heat exchanger 8, this detection A controller 23 that receives the temperature as an input narrows the opening degree of the valve 24 to close the high temperature generator 1.
At the same time, the contact point 25 of the absorption liquid pump 14 is switched from the state shown in the figure to the opposite position, and the rotation of the pump 14 is rotated from the normal rotation to the reverse direction, thereby reducing the circulation amount of the absorption liquid. , improved control characteristics that were difficult to achieve with conventional small-sized absorption chillers, for example, reducing only the heating and cooling capacity while maintaining the liquid concentration and pressure balance in the circulation of refrigerant and absorption liquid as an absorption chiller. Operational control is possible simply by electrically operating the non-vacuum section, and this has a great practical effect in improving the control characteristics and simplifying the control of small-sized absorption refrigerators.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing an embodiment of an absorption refrigerator according to the present invention, and FIG. 2 is a performance curve diagram of an absorption liquid pump. 1, 4... Generator, 7... Evaporator, 10... Absorber, 14... Absorption liquid pump, 23... Controller,
25...Contact.

Claims (1)

[Claims] 1. Absorbing refrigerant vaporized in the evaporator and diluting the absorption liquid is returned to the generator by a pump, and the pump is a reversible pump that discharges a different amount of liquid during forward rotation and reverse rotation, and this reversible pump What is claimed is: 1. An absorption refrigerating machine characterized by having a mechanism for switching the direction of rotation of the refrigerating machine when a temperature control load such as air conditioning or heating changes.