JPH06249539A - Absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To eliminate excessive cooling of chilled water and the freezing of a refrigerant even when a freezing load decreases sharply or even when the temperature of a cooling water lovers sharply. CONSTITUTION:In an absorption refrigerating machine in which a high temperature reproducer 1, a condenser 5. an evaporator 6, an absorber 7 and the like are connected with a piping to form a circulation cycle of a refrigerant and an absorption liquid, gas phase parts of the condenser 5 and the evaporator 6 are connected being allowed to penetrate into each other through a shutoff valve 19 while the evaporator 6 is provided with a temperature detector 21 to detect the temperature of the refrigerant. A controller 24, is arranged to make the gas phase parts of the condenser 5 and the evaporator 6 penetrate into each other by opening the shutoff valve 19 when the temperature detector detects a specified temperature (e.g. 20 deg.C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly, when the cooling load is suddenly reduced or the temperature of the cooling water is drastically lowered, the cold water is overcooled or the refrigerant is frozen. The present invention relates to an absorption refrigerating machine that does not burn.

[0002]

2. Description of the Related Art As a technique of this kind, for example, Japanese Patent Laid-Open No.
In a cooling water pipe housed in the absorber and the condenser disclosed in JP-A-8-221358, via a control valve,
A cooling water side pipe that bypasses the absorber is provided, and a detector that detects a physical quantity such as the temperature of the refrigerant flowing through the evaporator is provided, and the physical quantity reaches the first lower limit set value by the signal of the detector. From that time, the opening of the control valve is controlled to adjust the amount of cooling water to the absorber, and when the physical amount reaches the second lower limit set value, stop heating and absorption of the regenerator (described as a generator) A refrigerant freeze prevention device for an absorption refrigerator having a controller for stopping circulation of a liquid is well known,

According to this refrigerant antifreezing device, even if the temperature of the cooling water is remarkably lowered or the flow rate of the refrigerant supplied to the evaporator at the initial stage of operation is small, the refrigerant freezes and normal operation cannot be performed. The problem was solved.

[0004]

However, the above-mentioned Japanese Unexamined Patent Application Publication No.
The refrigerant antifreezing device proposed in Japanese Patent Laid-Open No. 8-221358 also has a problem that the cold water is overcooled or the refrigerant is frozen when the refrigerating load is suddenly reduced, and a solution to this problem has been a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. A regenerator, a condenser, an evaporator, an absorber and a heat exchanger are connected by pipes to form a refrigerant. In an absorption refrigerating machine that forms a circulation cycle of absorbing liquid, the gas phase portions of the condenser and the evaporator are connected so as to be able to communicate with each other via an opening / closing valve, and the evaporator is provided with a temperature detecting means for the refrigerant, and When the refrigerant temperature detected by the temperature detecting means is lowered to a predetermined temperature, an absorption refrigerator having a controller that opens the on-off valve,

In an absorption refrigerator in which a regenerator, a condenser, an evaporator, an absorber and a heat exchanger are connected by piping to form a circulation cycle of a refrigerant and an absorption liquid, the vapor phase portions of the condenser and the evaporator are opened and closed. Control for opening the on-off valve when the temperature of the cold water that has been heat-exchanged by the evaporator is provided and the temperature of the cold water detected by the temperature detecting means has dropped to a predetermined temperature while being connected so that they can communicate with each other via a valve. An absorption refrigerating machine characterized by being provided with a container is provided to solve the above-mentioned problems of the prior art.

[0007]

When the temperature detecting means reduces the temperature of the refrigerant in the evaporator to a predetermined temperature set in advance or the temperature of the discharge side cold water exchanged in the evaporator drops to a predetermined temperature set in advance, the controller sends a signal. Upon receiving the open signal, the on-off valve opens, and the vapor phase portions of the condenser and the evaporator communicate with each other. Therefore, the pressure difference between the condenser and the evaporator is reduced, and the amount of the refrigerant liquid condensed in the condenser flowing to the evaporator is reduced. Then, since the evaporation of the refrigerant is significantly reduced in the evaporator having the increased internal pressure, the cold water is not overcooled and the refrigerant is not frozen.

[0008]

【Example】

(Embodiment 1) A first embodiment will be described with reference to FIG. 1. Reference numeral 1 is provided with a combustion device 2 for gas, kerosene or the like, and a dilute liquid is heated to generate a refrigerant vapor to be concentrated into an intermediate liquid. The high temperature regenerator, 3 is a separator for separating the refrigerant vapor pumped from the regenerator and the intermediate liquid, and 4 is the low temperature regenerator for heating the intermediate liquid with the refrigerant vapor from the separator to make it a concentrated liquid, 5 Is a condenser that cools and condenses the refrigerant vapor from both the regenerators 1 and 4, 6 is an evaporator that evaporates the refrigerant liquid by spraying, dropping, etc. from the refrigerant distributor 23, and 7 is the refrigerant from this evaporator An absorber that absorbs vapor into the concentrated liquid from the low-temperature regenerator 4 to maintain a low pressure inside the device, and 8 is residual heat of the refrigerant after heating the intermediate liquid in the low-temperature regenerator 4 and is not evaporated in the evaporator 6. Bubble pumps for pumping refrigerant, 9 and 10 are low and high temperature heat exchangers, These are liquid being pumped tube 11, the intermediate liquid pipe 1
2, dilute liquid pipe 1 having concentrated liquid pipe 13 and absorption liquid pump 14
5, refrigerant conduit 16, refrigerant liquid pipe 17 and refrigerant return pipe 18
And a refrigerant bypass pipe 2 which is connected to form a circulation cycle of the refrigerant and the absorbing liquid and further has an opening / closing valve 19.
The gas phase portions of the condenser 5 and the evaporator 6 are connected by 0 so that they can communicate with each other.

Further, 21 is a temperature detector for detecting the temperature of the refrigerant flowing inside the refrigerant distributor 23, 24 is a controller for controlling the opening / closing of the opening / closing valve 19 based on the signal of the temperature detector, 25 Is a cold water pipe piped through the inside of the evaporator 6, and 26 is a cooling water pipe piped through the inside of the absorber 7 / condenser 5 having a cooling water pump 27.

In the absorption refrigerator having the above structure, the controller 24 opens the on-off valve 19 when the refrigerant temperature detected by the temperature detector 21 drops to a predetermined temperature, for example, 2 ° C., and closes it when it rises to 5 ° C. By installing the on-off valve 19 and the on-off valve 19, it is possible to avoid that the cold water is overcooled or the refrigerant is frozen even if the refrigeration load is sharply reduced or the cooling water temperature is sharply lowered. .

That is, when the refrigerating load is suddenly reduced, the temperature of the cold water flowing back to the cold water pipe 25 hardly rises. Therefore, when the refrigerant is evaporated in the evaporator 6 as before, the cold water flowing back is easily overheated. In the absorption refrigerator of the present invention, the temperature of the refrigerant flowing through the refrigerant distributor 23 is the predetermined temperature (this In this case, when the temperature drops to 2 ° C.), an open signal is transmitted from the controller 24 which has received the temperature data detected by the temperature detector 21, and the on-off valve 19 is opened, so that the gas phase of the condenser 5 and the evaporator 6 is increased. The parts communicate with each other, and the pressure difference between the condenser 5 and the evaporator 6 is reduced. Therefore, the amount of the refrigerant liquid condensed in the condenser 5 flowing to the evaporator 6 decreases and the internal pressure of the evaporator 6 increases, so that the evaporation of the refrigerant is suppressed and the cooling action is decreased. Therefore, the cold water that is cooled by heat exchange in the evaporator 6 does not become a supercooled state, and the refrigerant does not freeze.

Further, even when the temperature of the cooling water flowing through the cooling water pipe 26 suddenly drops, in the conventional absorption refrigerating machine, the absorber 7 becomes supercooled and the generation of the refrigerant vapor in the evaporator 6 increases rapidly. However, the cooling action was significantly increased, the cold water was overcooled, and the problem that the refrigerant was frozen was likely to occur, but in the case of the absorption refrigerator of the present invention having the above configuration, the refrigerant temperature is up to a predetermined temperature. When the temperature drops, the on-off valve 19 is opened to connect the vapor phase parts of the condenser 5 and the evaporator 6 to each other to suppress the evaporation of the refrigerant. Therefore, even when the temperature of the cooling water is suddenly decreased, the cold water is overcooled or the refrigerant is cooled. Freed from the problem of being frozen.

It should be noted that when the temperature detector 21 detects a decrease in the refrigerant temperature in the evaporator 6, and the opening / closing valve 19 is opened, the cooling water pump 27 is stopped at the same time to interrupt the supply of the cooling water, or the evaporator 6 is used. A more remarkable effect can be obtained by opening an on-off valve (not shown) that connects the refrigerant liquid reservoir 28 and the absorber 7 or by stopping the combustion device 2.

Even if the operation of the cooling water pump 27 is stopped when the temperature detector 21 detects the decrease in the refrigerant temperature in the evaporator 6, it is not necessary to stop the circulation of the cold water supplied through the cold water pipe 25. Therefore, it does not hinder the cooling operation.

(Embodiment 2) A second embodiment will be described with reference to FIG. In the absorption refrigerator illustrated here, instead of the temperature detector 21 in the absorption refrigerator shown in FIG. 1, the cold water temperature after heat exchange (cooling) of the temperature detector 22 by the evaporator 6 can be detected, It is provided at the evaporator outlet of the cold water pipe 25.

Also in the absorption refrigerator having the above-mentioned structure, the controller 24 opens the on-off valve 19 when the cold water temperature detected by the temperature detector 22 drops to a predetermined temperature, for example, 3 ° C., and closes it when it rises to 7 ° C. By installing the on-off valve 19 and the on-off valve 19, if the refrigerating load is sharply reduced or the cooling water temperature is drastically lowered and the cooling water temperature is lowered to a predetermined temperature, the same as in the case of the absorption refrigerator shown in FIG. The on-off valve 19 opens to the evaporator 6
The function of suppressing the evaporation of the refrigerant in is working. For this reason,
There is no problem that the cold water flowing through the cold water pipe 25 in the evaporator 6 is overcooled or the refrigerant is frozen.

In this case as well, when the drop of the refrigerant temperature in the evaporator 6 is detected and the opening / closing valve 19 is opened, the cooling water pump 27 is stopped to interrupt the supply of the cooling water, or the evaporator 6 is opened.
A more remarkable effect can be obtained by opening an on-off valve (not shown) that connects the refrigerant liquid reservoir 28 and the absorber 7 or by stopping the combustion device 2.

Since the present invention is not limited to the above embodiments, various modifications can be made without departing from the spirit of the claims.

For example, the temperature detector 21 has a refrigerant liquid pool 28.
It may be installed to detect the temperature of the refrigerant in
The temperature detector 22 may be installed at the inlet or inside of the evaporator 6 so as to detect the temperature of the cold water flowing into the evaporator 6 or the temperature of the cold water cooled by the evaporator 6.

The absorption refrigerator may be a double-effect type or a single-effect type absorption refrigerator, or may be an ordinary refrigerant pump instead of the bubble pump 8 or the separator 3. It is also possible to use an absorption refrigerating machine having no structure.

[0021]

As described above, in the absorption refrigerator according to the present invention, the vapor phase portions of the condenser and the evaporator are connected to each other through the on-off valve, and the refrigerant temperature detecting means is connected to the evaporator. And, when the refrigerant temperature detected by the temperature detecting means is lowered to a predetermined temperature, an absorption refrigerator having a controller for opening the on-off valve,

The gas phase portions of the condenser and the evaporator are connected to each other through an on-off valve so that they can communicate with each other, and a temperature detecting means for the cold water that has exchanged heat with the evaporator is provided, and the cold water detected by the temperature detecting means is provided. Since the absorption refrigerator has a controller that opens the on-off valve when the temperature drops to a predetermined temperature,

When the temperature of the refrigerant in the evaporator drops to a predetermined temperature set in advance, or when the temperature of the discharge side chilled water that has undergone heat exchange in the evaporator drops to a predetermined temperature set in advance, an open signal transmitted from the controller is received. The on-off valve opens, the gas phase portions of the condenser and the evaporator communicate with each other, and the pressure difference between the condenser and the evaporator is reduced. Then, the amount of the refrigerant liquid condensed in the condenser flowing down to the evaporator is reduced, and the evaporation of the refrigerant is significantly reduced in the evaporator with the increased internal pressure, so that the cold water is not overcooled, and the refrigerant is It will not freeze.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a second embodiment.

[Explanation of symbols]

 1 High Temperature Regenerator 2 Combustion Device 3 Separator 4 Low Temperature Regenerator 5 Condenser 6 Evaporator 7 Absorber 8 Bubble Pump 9 Low Temperature Heat Exchanger 10 High Temperature Heat Exchanger 11 Pumping Liquid Pipe 12 Intermediate Liquid Pipe 13 Concentrated Liquid Pipe 14 Absorption Liquid pump 15 Dilute liquid pipe 16 Refrigerant conduit 17 Refrigerant liquid pipe 18 Refrigerant return pipe 19 Open / close valve 20 Refrigerant bypass pipe 21/22 Temperature detector 23 Refrigerant distributor 24 Controller 25 Cold water pipe 26 Cooling water pipe 27 Cooling water pump 28 Refrigerant liquid Reservoir

Claims (2)

[Claims] 1. An absorption refrigerator in which a regenerator, a condenser, an evaporator, an absorber, and a heat exchanger are connected by piping to form a circulation cycle of a refrigerant and an absorption liquid, and gas phase portions of the condenser and the evaporator are connected to each other. Is connected so as to be able to communicate with each other via an on-off valve, a temperature detecting means for the refrigerant is provided in the evaporator, and the on-off valve is opened when the refrigerant temperature detected by the temperature detecting means falls to a predetermined temperature. An absorption refrigerating machine characterized by being provided. 2. An absorption refrigerator in which a regenerator, a condenser, an evaporator, an absorber and a heat exchanger are connected by piping to form a circulation cycle of a refrigerant and an absorbent, and gas phase portions of the condenser and the evaporator are connected to each other. Is connected via an on-off valve so as to be able to communicate with each other, and a temperature detecting means for cold water exchanged by an evaporator is provided, and when the cold water temperature detected by this temperature detecting means falls to a predetermined temperature, the on-off valve is opened. An absorption refrigerator having a controller for opening.