JPH04222361A - Absorption type refrigerating machine - Google Patents

Abstract

PURPOSE:To obtain an absorption type refrigerating machine, whose absorbing capacity will never be deteriorated even when the combination of absorbing agent-refrigerant, whose temperature difference in boiling points is not so big, is employed. CONSTITUTION:An expansion valve V1 is provided in a refrigerant passage 7 connecting a condenser C to an evaporator E while a gas/liquid separator S is provided at the outlet port of the evaporator E. The gas side of the gas/ liquid separator S is connected to an absorber A through a piping 10 while the liquid side of the same is connected to a pipeline between the outlet port of the absorber A and a solution pump P through another piping 11. A demister D is provided in the gas/liquid separator while refrigerant is discharged from the evaporator E in the condition of two-phase solution of gas and liquid as it is whereby the accumulation of the solution in the evaporator is prevented. On the other hand, the refrigerant is separated into two phases by the gas/liquid separator and only the gas phase is absorbed by the absorber A whereby absorbing performance is excellent.

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 to an absorption refrigerating machine using an absorbent-refrigerant combination in which the difference in boiling point temperature is not large.

0002

[Prior Art] Conventionally, in an absorbent-refrigerant combination in which the difference between the boiling point temperature of the absorbent and the refrigerant is not large, even if the generated refrigerant vapor is rectified in a generator, a certain amount of absorbent remains. enters the evaporator via the condenser. Then, in the evaporator, vapor containing a large amount of refrigerant evaporates due to the relationship of vapor-liquid equilibrium, and the concentration of the absorbent increases. As the absorbent concentration increases, the evaporation temperature increases and the refrigeration effect is no longer exhibited. For this reason, in order to avoid over-concentration in the evaporator, high concentration of absorbent (refrigerant)
Liquid needs to be discharged from the evaporator.

0003

[Problems to be Solved by the Invention] Incidentally, even though the (refrigerant) liquid has a high absorbent concentration, the absorbent concentration is much lower than that of the solution in the absorber. The absorption capacity is greatly affected by where and how the liquid released from the evaporator is returned. For example, if the liquid from the evaporator is returned directly to the absorber, the absorbent concentration of the absorbent solution decreases and the absorption capacity decreases. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an absorption refrigerating machine in which the absorption capacity of the absorber does not decrease even when an absorbent-refrigerant combination having a small difference in boiling point temperature is used.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention uses a generator, a condenser, an absorber, an evaporator, and a solution heat exchanger as main components, and connects these to solution piping and refrigerant piping. In an absorption refrigerator that is connected to form a cycle, an expansion valve is provided in the refrigerant passage leading from the condenser to the evaporator, and a gas-liquid separator is provided at the evaporator outlet, and the gas side of the gas-liquid separator is connected to the absorber. This absorption refrigerator is characterized in that the liquid side of the gas-liquid separator is connected to the passage between the absorber outlet and the solution pump by piping.

In the absorption refrigerator, a demister is provided in the gas-liquid separator, a gas-liquid refrigerant inlet from the evaporator is provided at the bottom of the demister, and a gas-liquid refrigerant inlet from the evaporator is provided at the bottom of the demister. A vapor outlet is provided at the bottom of the gas-liquid separator below the demister, and a liquid outlet is provided at the bottom of the gas-liquid separator.

[0006]

[Operation] In the present invention, the liquid discharged from the evaporator is discharged along with the vapor flow of the evaporative refrigerant, and the (refrigerant) liquid with a high absorbent concentration is specially selected from the evaporator. Instead of storing and releasing it, towards the evaporator outlet,
As the amount of vapor increases, the concentration of the absorbent in the refrigerant liquid also increases, so the refrigerant attempts to exit the evaporator (heat transfer section) as a two-phase gas-liquid flow.

In order to prevent the absorption capacity from decreasing, a gas-liquid separator is provided between the evaporator outlet and the absorber to separate the previous two-phase flow into gas and liquid, and the vapor part is separated from the absorber. The liquid is introduced into the absorber outlet or into the suction side of the solution pump after leaving the absorber.

[0008]

EXAMPLES The present invention will be explained in detail below with reference to the drawings, but the present invention is not limited thereto.

Embodiment 1 FIG. 1 is a flow diagram showing an example of an absorption refrigerator according to the present invention. In Figure 1, G is a generator, A is an absorber, E is an evaporator, C is a condenser, H1 is a solution heat exchanger, S is a gas-liquid separator, D is a demister, P is a pump, and V1 is an expansion valve. ,
1 to 5 are solution passages, and 6 to 11 are refrigerant passages.

In FIG. 1, absorber A is an example of a flooded absorber, in which vapor is absorbed into the absorption solution while rising in the form of bubbles. Further, the evaporator E is air-cooled, and gas and liquid flow in two phases after the expansion valve, so that the flow is temporary.

Next, to explain the cooling operation using this device, the dilute solution that has absorbed the refrigerant is transferred from the absorber A to the liquid phase of the gas-liquid separator S through the pipe 11, and then the solution is Pump P
As a result, it passes through the tube 2, passes through the heated side of the heat exchanger, and is introduced into the generator G from the tube 3. In the generator G, the refrigerant is heated by the heat source from the tube 12, and refrigerant vapor is generated and concentrated. The concentrated solution passes from tube 4 through the heating side of heat exchanger H, is introduced from tube 5 into absorber A, absorbs the refrigerant, becomes a dilute solution, and is circulated through tube 1. In addition, the refrigerant vapor generated in the generator G passes through the pipe 6 and enters the condenser C, and the cooling water 14
It is cooled and condensed, and is introduced into the evaporator E from the pipe 7 through the expansion valve V1 and the pipe 8.

In the evaporator E, heat is removed from the air by air cooling, a part of the refrigerant evaporates, and the gas and liquid flow in two phases and are introduced into the gas-liquid separator S through the pipe 9. The gas-liquid separator S is provided with a demister D, in which the gas and liquid are separated, and the refrigerant vapor in the gas phase is introduced into the solution in the absorber A from the pipe 10 in the form of bubbles. Absorbed. On the other hand, a liquid mixture of a liquid phase refrigerant and a solution is introduced from the pipe 11 into the pipe 1 coming out of the absorber A and circulated.

[0013] In this way, by separating the gas and liquid phases exiting the evaporator E into two phases and allowing them to flow separately, it is possible to prevent a decrease in the absorption capacity of the absorber.

Embodiment 2 FIG. 2 shows a flow diagram of another absorption refrigerator according to the present invention. In Fig. 2, the cooling effect is basically achieved in the same cycle as in Fig. 1, but the difference from Fig. 1 is that in Fig. 2, a rectifier R is provided above the generator; Another point is that a supercooler H2 for the condensed refrigerant is provided. The absorber is shown as an air-cooled, liquid-filled type. Vapor rises in the form of bubbles through the absorption solution and is absorbed into the solution. The refrigerant is
It flows through the air-cooled evaporator as a transient gas-liquid two-phase stream.

In this device, the dilute solution leaving the absorber is combined with the liquid phase from the gas-liquid separator S, and is sent from the pipe 2 to the generator G.
The solution-refrigerant is passed through the cooling pipe of the decentralizer F of the rectifier R installed at the upper part of the refrigerant, and is introduced into the generator through the solution heat exchanger H1. The same cycle as in Example 1, except that the condensed refrigerant liquid is led from tube 7 to subcooler H2, where it is further cooled and the gas-liquid two-phase flow through the evaporator is heated. A similar effect can be achieved by operating the air conditioner.

[0016]

[Effects of the Invention] According to the present invention, a gas-liquid separator is provided at the outlet of the evaporator, and only the separated gas is introduced into the absorber, so that the absorption capacity of the absorber does not decrease and is continuously maintained. This enables efficient cooling operation.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram showing an example of an absorption refrigerator of the present invention.

FIG. 2 is a flow diagram showing another example of the absorption refrigerator of the present invention.

[Explanation of symbols]

G Generator A Absorber E Evaporator C Condenser H1 Solution heat exchanger H2 Refrigerant supercooler S Gas-liquid separator D Demister P Pump R Rectifier F　Demultiplexer V1 Expansion valve 1-5 Solution passage 6-11 Refrigerant passage 12 Heat source 13,14 Cooling water

Claims (2)

[Claims] Claim 1: In an absorption refrigerator whose main components are a generator, a condenser, an absorber, an evaporator, and a solution heat exchanger, these are connected by solution piping and refrigerant piping to form a cycle. An expansion valve is provided in the refrigerant passage leading to the evaporator, and a gas-liquid separator is provided at the outlet of the evaporator, and the gas side of the gas-liquid separator is connected to the inside of the absorber by piping. An absorption refrigerator characterized in that the absorber outlet is connected to a solution pump by a passage and piping. 2. The gas-liquid separator includes, in the gas-liquid separator,
A demister is provided, a gas-liquid refrigerant inlet from the evaporator is provided at the bottom of the demister, a vapor outlet is provided above the demister, and a liquid outlet is provided below the demister at the bottom of the gas-liquid separator. An absorption refrigerator according to claim 1.