JPS6118365Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerant circulation system for an absorption refrigerator, and more particularly to a refrigerant circulation system for a small-capacity so-called compact absorption refrigerator.

Conventionally, this type of small-sized absorption refrigerator does not need to spray a large amount of refrigerant into the evaporator, so the absorption refrigerator uses its own heat radiation to heat the refrigerant and generate bubbles, and the rising power of the bubbles A refrigerant circulation path equipped with a so-called bubble pump that pumps refrigerant and circulates the refrigerant is widely used. This bubble pump is
Although it has the advantages of not using electricity, saving energy, and requiring no mechanical driving force, there are fewer failures.
There is a disadvantage that the refrigerator does not operate until the self-radiation temperature of the refrigerator rises sufficiently at the start of operation, and the initial performance of the refrigerator is poor, and if the cooling water temperature is too low, the refrigerant freezes and becomes inoperable. . Furthermore, when heating to the regenerator is stopped during low cooling load, the bubble pump function also stops, reducing the refrigerating capacity and reducing the efficiency of the absorption refrigerator.

In view of such drawbacks and problems, the present invention provides a refrigerant circuit having a bubble pump and another refrigerant circuit having a refrigerant pump in parallel, and also reduces the temperature of the absorption liquid of the regenerator.
The configuration includes a controller that starts and stops the refrigerant pump by detecting physical quantities such as the temperature at the inlet of cooling water to the absorber and the temperature at the outlet of cold water from the evaporator, thereby improving the initial operating performance of the absorption chiller and freezing the refrigerant. The present invention provides a refrigerant circulation device for an absorption refrigerator, which is designed to prevent such problems and improve the efficiency of the refrigerator at low loads.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a high-temperature regenerator that heats a dilute absorption liquid using combustion gas such as gas or oil; 2 is a high-temperature regenerator that heats a dilute absorption liquid using combustion gas such as gas or oil; 2 is a refrigerant vapor from the absorption liquid that has been heated by the high-temperature regenerator 1 and has risen through a lift pipe 3 together with refrigerant vapor bubbles; gas-liquid separator, which separates
4 compartmentally houses a low-temperature regenerator 5 that further heats and separates the intermediate absorption liquid using the refrigerant vapor from the separator 2, and a condenser 6 that cools and liquefies the refrigerant vapor generated in the regenerator and the high-temperature regenerator 1. recycled condensation cylinder,
4' transfers the liquid refrigerant from the condenser 6 to a refrigerant distribution device 7.
An evaporator 8 which extracts cold water for air conditioning by spraying and vaporizing it with the evaporator, and a concentrated liquid sprayed from an absorption liquid sprayer 9 absorbs the vaporized refrigerant in the evaporator to continue vaporizing the refrigerant. absorber 10
11 and 12 are low temperature and high temperature solution heat exchangers, which are connected to the refrigerant vapor pipe 1.
3. A first refrigerant circulation path 16 having a bubble pump 14 and connecting the refrigerant diffuser 7 and a refrigerant reservoir 15 provided below the evaporator 8; a refrigerant pump 17 connecting the refrigerant reservoir 15 and the first refrigerant; A second refrigerant circulation path 18 is connected to the circulation path 16 and arranged in parallel with the circulation path, and a heating section 19 is formed in the middle to heat the refrigerant in the bubble pump 14 to generate bubbles and operate the bubble pump. A refrigerant liquid pipe 20 that guides the liquid refrigerant from the condenser 6 to the refrigerant spargeer 7, and a dilute liquid pipe 2 having an absorption pump 21.
2. The intermediate liquid pipe 23, the concentrated liquid pipe 24, the pumping liquid pipe 3, etc. are connected to form a closed circulation cycle of the refrigerant and the absorption liquid.

25 is a cold water pipe that takes out cold water from the evaporator 8; 26 is a cooling water pipe that cools the absorber 10 and the condenser 6; the cooling water pipe is on the inlet side of the absorber 10;
A controller 27 such as a thermostat that detects temperature and starts and stops the refrigerant pump 17 is provided on the cold water outlet side of the cooling water pipe 25 or on the liquid pumping pipe 3.

At the beginning of the operation of the absorption refrigerator, the liquid pumping tube 3 is provided until the absorption liquid is heated in the regenerator 1 and reaches a predetermined temperature, and the absorption liquid is pumped with the generation of refrigerant vapor. The controller 27 operates the refrigerant pump 17 to spray the refrigerant stored in the refrigerant reservoir 15 to the evaporator 8 via the second refrigerant circuit 18 to lower the temperature of the chilled water, thereby operating the absorption refrigerator. While improving initial performance, absorber 1
Refrigerant reservoir 15 when the cooling water inflow temperature to 0 is low
Freezing of the refrigerant, etc., is prevented by forcing the refrigerant to flow through the second refrigerant circuit 18 using the refrigerant pump 17. Then, the bubble pump 14 starts operating by the heating section 19 of the refrigerant liquid pipe 20, and when the wall temperature of the liquid pump 3 reaches the set value, the refrigerant pump 17 is stopped by the controller 27, and the first refrigerant circulation path 16 is stopped. Bubble pump 14 that requires no power via
As a result, the operation shifts to steady operation in which refrigerant is sprayed into the evaporator 8. Also, when the cooling load is low, high temperature regenerator 1
Normally, the heating to the bubble pump 1 is controlled to be temporarily stopped intermittently, and therefore, the bubble pump 1 is
However, when the wall temperature of the liquid pumping pipe 3 or the cold water outlet temperature is detected and the temperature falls below the set value, the controller 27 activates the refrigerant pump 17 to cool the liquid through the second refrigerant circulation path 18. Refrigerant is sprayed into the evaporator 8 to maintain the refrigerating capacity, and as a result, the efficiency of the refrigerator is improved. Furthermore, during operation of the absorption chiller, even if the outside temperature suddenly drops and the cooling water temperature to the absorber 10 drops too much, the controller 27 will turn off the refrigerant pump 17 when the temperature falls below the set value. When activated, the amount of refrigerant circulated from the refrigerant reservoir 15 to the refrigerant distribution device 7 via the second refrigerant circulation path 18 is increased, and the residence time of the refrigerant in the refrigerant reservoir 15 etc. is shortened to prevent the refrigerant from freezing.

As described above, the present invention has a refrigerant circuit equipped with a bubble pump operated by the self-radiation of the refrigerator, and another refrigerant circuit equipped with a refrigerant pump installed in parallel, thereby increasing the temperature of the absorption liquid in the regenerator and the temperature of the absorption liquid in the absorber. Since this is a refrigerant circulation system for an absorption chiller that is equipped with a controller that detects physical quantities such as the coolant inlet temperature or the chilled water outlet temperature from the evaporator and starts and stops the refrigerant pump, the initial operating performance of the absorption chiller can be improved. In addition, it has a refrigerant freeze prevention function, and even if the regenerator is controlled to stop heating intermittently during low loads, it can stably maintain the refrigerating capacity and improve the efficiency of the refrigerator. It is beneficial. Although the embodiment shown in the figures has been explained using a double-effect absorption refrigerator, it goes without saying that the present invention can be implemented in a single-effect absorption refrigerator.

[Brief explanation of the drawing]

The drawing is a schematic explanatory diagram of the circuit configuration of an embodiment of the present invention. 14...Bubble pump, 15...Refrigerant reservoir, 16
...First refrigerant circulation path, 14...Refrigerant pump, 18
...Second refrigerant circulation path, 27...Controller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an absorption refrigerator in which a regenerator, condenser, evaporator, absorber, etc. are connected via piping to form a closed circulation cycle of refrigerant and absorption liquid, A refrigerant distribution device provided below the evaporator and a refrigerant reservoir provided below the evaporator are connected by a refrigerant circulation path having a bubble pump, and another refrigerant circulation path having a refrigerant pump is arranged in parallel with the circulation path, and the refrigerant pump A refrigerant circulation device for an absorption refrigerator, characterized in that the start and stop of the regenerator is controlled by a controller that detects a physical quantity such as the temperature of an absorption liquid in a regenerator. (2) The refrigerant circulation system for an absorption refrigerator according to claim 1, wherein the physical quantity is the temperature of the cooling water inlet to the absorber. (3) The refrigerant circulation device for an absorption refrigerator according to claim 1, wherein the physical quantity is the outlet temperature of chilled water from the evaporator.