JPS586231Y2 - Small absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water-lithium salt compact absorption refrigerator that utilizes a relatively low-temperature heat source, such as hot water obtained from a solar collector.

More specifically, the present invention relates to a compact retractable refrigerator that facilitates restarting operation after a temporary stop.

Conventionally, when hot water or the like whose temperature fluctuates is used as a heat source in this type of refrigerator, Japanese Patent Application Laid-Open No. 51-3444
According to No. 6, it is disclosed that stable and efficient operation can be achieved by providing a refrigerant storage chamber that adjusts the concentration of the circulating absorbent solution in order to compensate for boiling of the absorbent solution in the regenerator. has been done.

Small-sized absorption refrigerators that use hot water or the like as a heat source whose temperature fluctuates and are equipped with a refrigerant storage chamber have serious drawbacks.

In other words, when hot water at a high temperature is used as a heating source, the concentration of the absorbent solution in the system is high, but
If the operation is stopped at this point, the concentration of the absorbent solution in the regenerator will be high the next time the operation is started, so the heating source only needs to be at a high temperature. Sometimes it became impossible.

Therefore, in continuous operation, it is possible to operate within the concentration range set by the refrigerant storage chamber, but once it is stopped, operation cannot be resumed unless the temperature of the heat source hot water is higher than the temperature at the time of stopping.

According to the inventor's experiments, when the machine was stopped at a hot water temperature of 95°C, it was no longer possible to restart operation with hot water at a temperature of 88°C or lower after hours.

Furthermore, when the regenerator is stopped, the liquid depth in the regenerator becomes deeper than during operation (because the circulating liquid falls to the bottom), which makes it even more difficult to start operation.

Especially when the hot water temperature is low (below 80℃), the pressure increase due to the increase in liquid depth cannot be ignored (as the hot water temperature decreases, its vapor pressure also decreases, and the proportion of the pressure increase due to increase in liquid depth becomes large) ), in experiments, operation could not be started unless the temperature was higher than the temperature at which it stopped.

In addition, when stopped at 75°C, operation could not be started unless the temperature was 78°C or higher.

The present invention relates to a small absorption refrigerating machine that returns refrigerant stored in a refrigerant storage chamber to a regenerator at the time of shutdown to reduce the concentration of an absorbent solution in the regenerator, thereby facilitating restart of operation.

The purpose of the present invention is to take out and release refrigerant from an absorbent solution circuit consisting of a regenerator, a condenser, an evaporator, and an absorber in response to fluctuations in the temperature of the heating source in the regenerator, thereby increasing the concentration of the absorbent solution. In a small absorption refrigerator equipped with a refrigerant storage chamber for adjusting the refrigerant, the regenerator is connected to a U-shaped pipe that connects the refrigerant storage chamber and a conduit from the condenser to the evaporator. and an orifice or valve is interposed in the middle of the conduit so that the refrigerant stored in the refrigerant storage chamber is returned to the regenerator when the operation is stopped. Our goal is to provide the following.

The present invention will be described in detail with reference to the drawings showing a preferred embodiment of the present invention.

In the drawings, reference number 1 is a regenerator, 2 is a separator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, 6 is a refrigerant storage chamber, and 7 is a regenerator.
is a heat exchanger, 8 is an evaporator coil, 9 is a heating hot water inlet, 9
' is a heated hot water outlet, 10, 10' and 10'' are cooling water coils, 11 is an orifice, 12 is a separator pressure transmission pipe, 13 is a refrigerant return pipe, and 14 is an orifice.

In this small-sized absorption refrigerator, the dilute absorbent solution is raised and concentrated in the regenerator 1 by heated hot water that enters from the heated hot water port 9 and exits from the heated hot water outlet 9', and is separated into steam and concentrated absorbent solution in the separator 2. be done.

The separated water vapor is sent to the cooling water coil 10 in the condenser 3.
It is cooled by the cooling water flowing through it and becomes water.

The water thus obtained enters the evaporator 4 from the condenser 3 via a pipe and is evaporated, during which time it absorbs heat from the secondary refrigerant flowing through the coil 8 of the evaporator 4 and evaporates.

The water vapor then enters the absorber 5, is separated by the separator 2, is absorbed by the concentrated absorbent solution heated by the heat exchanger 7, and returns to the regenerator 1 after becoming a dilute absorbent solution.

One line from the condenser 3 to the evaporator 4 is provided with a refrigerant storage 6 by a U-shaped tube.

The pressure inside the refrigerant storage chamber 6 is always kept constant by the cooling water flowing through the cooling water coil 10.

Further, the pipeline is provided with a separator pressure transmission pipe for transmitting the pressure of the separator 2.

Therefore, when water moves from condenser 3 to evaporator 4,
Water is stored in the refrigerant reservoir in response to variations in the pressure of the separator, ie in response to variations in the temperature of the heated hot water entering the regenerator.

Therefore, the concentration of the absorbent solution in the system is adjusted according to the temperature fluctuation of the heated hot water, so that boiling in the regenerator 1 is performed stably.

According to the present invention, a refrigerant return pipe 13 is provided that connects the regenerator 1 with the U-shaped pipe that connects the pipe line from the condenser 3 to the evaporator 4 and the refrigerant storage chamber 6, and the iron pipe 13 is provided with an orifice 14 that functions as a valve.

Therefore, during operation, the refrigerant is pushed up into the refrigerant storage chamber due to the pressure difference between the separator and the refrigerant storage chamber, but when the operation is stopped, this refrigerant passes through the orifices 11 and 14 into the refrigerant return pipe. 13 to the regenerator 1 to dilute the absorbent solution in the regenerator 1.

As a result, when the operation is restarted, the absorbent solution in the regenerator 1 is diluted, and stable operation is always performed within the set temperature range.

Although the present invention has been described above in detail with reference to a specific example, the present invention is not limited to this particular embodiment, and it goes without saying that many changes and modifications can be made without departing from the spirit of the present invention.

For example, in the above specific example, the orifice 14 is used as a member having a valve function, but of course a manual valve or an automatic valve may be used.

In the case of an orifice, it is possible that some refrigerant may flow into the regenerator through the orifice during operation, but the amount is very small and the function is sufficient even without a valve or other means. .

Furthermore, in the above specific example, the refrigerant is directly mixed into the absorbent solution in the regenerator, but the refrigerant is introduced into a heating device separately installed at the bottom of the regenerator, and the returned refrigerant is turned into vapor and then placed inside the regenerator. You may also inject it into the

[Brief explanation of drawings]

The drawing shows a preferred embodiment of the small-sized absorption refrigerator of the present invention. 1...Regenerator, 2...Separator, 3...
... Condenser, 4 ... Evaporator, 5 ...
・Absorber, 6... Refrigerant storage room, 7...
Heat exchanger, 8...Evaporator coil, 9...
・Heating hot water inlet, 9'... Heating hot water outlet, 10
．． 10', 10"... Cooling water coil, 11...
... Orifice, 12 ... Separator pressure transmission pipe, 13 ... Refrigerant return pipe, 14 ... Orifice.

Claims (1)

[Scope of utility model registration request] A refrigerant storage chamber for extracting and discharging refrigerant from an absorbent solution circuit consisting of a regenerator, a condenser, an evaporator, and an absorber in response to fluctuations in the temperature of the heating source of the regenerator to adjust the concentration of the absorbent solution. In the small-sized absorption refrigerating machine, a pipe is provided that connects a U-shaped pipe that connects a pipe from the condenser to the evaporator and the refrigerant storage chamber, and a pipe that connects the regenerator. A small-sized absorption refrigerator, characterized in that an orifice or a valve is interposed in the middle so that the refrigerant stored in the refrigerant storage chamber is returned to the regenerator when the operation is stopped.