JPS6232387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator using Freon as a refrigerant.

Traditionally, water-lithium bromide and ammonia-water systems have been widely used as absorption refrigerators, and these absorption refrigerators have generators, condensers, evaporators, absorbers, and liquid heat exchangers. It consists of a circulating water pump, etc. Absorption refrigerators that use fluorocarbon as a refrigerant also have the same configuration as the above two, and each of these generators has the function of heating a liquid mixture of refrigerant and absorbent to generate refrigerant vapor. In the above-mentioned water-lithium bromide system and ammonia-water system absorption refrigerator, capacity control of the generator burner, which is performed according to the load on the evaporator, is performed using one gun-type burner in the 100RT class. and fuel adjustment. Furthermore, in the 10RT class, there is currently no capacity control at all.

In a fluorocarbon absorption refrigerator, if the capacity is not controlled according to the evaporator load, as in the 10RT class mentioned above, the coefficient of performance will drop sharply compared to water-lithium bromide systems and ammonia-water systems. Additionally, the method of damping combustion air and fuel adjustment as in the 100RT class is expensive and technically difficult, especially for small and medium-sized engines.

In view of the above points, the present invention aims to prevent a decrease in the coefficient of performance at low loads by controlling the burner capacity according to the load on the evaporator in a fluorocarbon-based absorption refrigerator. .

In order to achieve the above object, the present invention configures a refrigeration cycle by connecting a generator, a separator, a condenser, an evaporator, an absorber, a solution pump, etc. with piping, and serves as a heating source for the generator section. In an absorption refrigerator that uses CFC as a refrigerant and has multiple burners installed,
The burners are characterized in that the flame ports of all the burners are formed in a rectangular shape, and the burners are arranged so that the long sides of the flame ports of all the burners cross all the concentrated solution passages flowing within the generator.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a burner that heats the heater 2 to form a high-temperature concentrated solution (high concentration of refrigerant);
3 is a separator that separates the concentrated liquid sent from the concentrated solution circuit 13 into refrigerant gas and dilute liquid (low refrigerant concentration); 4 is a condenser connected to the refrigerant circulation circuit 15;
6 is an evaporator connected to the condenser 4 via the expansion valve 5; 10 is an absorber connected to the evaporator 6; 7 is a regenerative heat exchanger connected to the dilute liquid circulation circuit 14; 9;
is an absorption process in which heat is exchanged between a dilute liquid that has been heat exchanged in the regenerative heat exchanger 7 and depressurized by the throttle valve 8, a concentrated solution that is a mixture of the refrigerant gas evaporated in the evaporator 6, and the concentrated solution from the solution pump 11. It is a heat exchanger.

In FIG. 2, the burner 1 is composed of a burner blower 18 that supplies combustion air and a rectangular flame port 20, and is connected to a high temperature concentrated liquid circuit 1 from a concentrated liquid circulation circuit 12.
The burners 1a, 1b, 1c, 1d are arranged so that the long sides of the flame ports 20 cross all the concentrated solution passages and are substantially perpendicular to the flow direction of the heater 2 leading to the heater 2. The combustion exhaust gas 19 is configured to flow out of the heater 2 . Furthermore, as shown in FIG. 3, each burner 1a, 1b,
1c and 1d are solenoid valves 21 that control the fuel system.
a, 21b, 21c, 21d, governor 22a, 2
2b, 22c, 22d, and the hand valve 23 are connected.

Next, the operation of this embodiment configured as described above will be explained.

Refrigerant gas (fluorocarbon gas) generated by the generator 26
The air flows into the condenser 4, exchanges heat with the outdoor heat exchange air 16, and is condensed and liquefied. The liquefied refrigerant is depressurized and expanded by the expansion valve 5, and then introduced into the evaporator 6, where it exchanges heat with the indoor heat exchange air 17 and evaporates. At this time, freezing or cooling is performed by the latent heat of vaporization taken away when the Freon evaporates. The fluorocarbon gas vaporized in the evaporator 6 is introduced into the absorber 10 via the absorption heat exchanger 9, where it is absorbed into an absorbent solution (hereinafter referred to as dilute solution) with a low concentration of refrigerant and liquefied. A solution having a high refrigerant concentration (hereinafter referred to as a concentrated solution) that absorbs fluorocarbon gas in this manner is sucked by the solution pump 11, pressurized, and introduced into the absorption heat exchanger 9. In the absorption heat exchanger 9, the dilute liquid absorbs refrigerant vapor and generates heat, so this and the concentrated liquid introduced into the absorption heat exchanger 9 exchange heat, and further heat exchange with the dilute liquid in the regenerative heat exchanger 7. After being preheated, it is introduced into the heater 2 and heated by the burner 1, so that it boils and becomes a gas-liquid two-phase flow, which is introduced into the separator 3 to form a cycle.

Next, due to the decrease in the load on the evaporator 6, the thermostat 25 with the heat-sensitive cylinder 24 installed in the evaporator 6 is activated.
The solenoid valves 21a, 21 shown in FIG.
d is turned off and only burners 1b and 1c are operated. If the load further decreases, burner 1b or 1c
Solenoid valves 21a, 21b, 2 so as to operate only
Cut 1d, or 21a, 21c, 21d. Also, make sure that the heater is as wide as one burner.
It will be more efficient if the heating from the burner is made uniform even when one burner is in operation.
By arranging a plurality of burners, the capacity can be easily and inexpensively controlled simply by switching the fuel electromagnetic valve.

Furthermore, by making it possible to control the capacity of the burner according to changes in the load on the evaporator, the coefficient of performance when the load decreases is improved, resulting in economical and energy saving.

Further, by arranging a plurality of burners in order in the depth direction of the flow of the heater, uniform heating can be achieved even when a portion of the central burner is operated during capacity control.

In addition, by matching the width of the heater to the width of one burner, heating becomes uniform, allowing for space saving and downsizing.Even if the capacity increases, the number of burners can be increased in the depth direction and the heater can be extended, making it proportional. Design becomes possible.

Since the present invention is configured as described above, it is possible to prevent a decrease in the coefficient of performance at low loads.

[Brief explanation of the drawing]

FIG. 1 shows a refrigeration cycle system diagram according to an embodiment of the present invention. FIG. 2 shows a three-dimensional view of the burner and heater of an embodiment of the invention. FIG. 3 shows a burner fuel system diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Burner, 2... Heater, 3... Separator, 4... Condenser, 5... Expansion valve, 6... Evaporator, 7... Regeneration heat exchanger, 8... Throttle valve, 9... Absorption heat exchanger, 10... Absorber, 11... Solution pump, 12... Concentrated liquid circulation circuit, 1
3... High temperature concentrated liquid circuit, 14... Dilute liquid circulation circuit, 15...
Refrigerant circulation circuit, 16... Outdoor heat exchange air, 17... Indoor heat exchange air, 18... Burner blower, 19... Exhaust gas, 20... Burner port, 21... Solenoid valve, 22... Governor, 23... Hand valve, 24... Heat-sensitive tube, 25... thermostat, 26... generator.

Claims (1)

[Claims] 1 Generator, separator, condenser, evaporator, absorber,
In an absorption refrigerator using Freon as a refrigerant, in which a refrigeration cycle is configured by connecting a solution pump, etc. with piping, and a plurality of burners are installed as a heating source for the generator section, the flame openings of all the burners are rectangular. form,
An absorption refrigerator characterized in that the burners are arranged so that the long sides of the flame ports of all the burners cross all the concentrated solution passages flowing in the generator.