JPH07280395A - Gas-liquid separator for absorption refrigerator - Google Patents

Abstract

PURPOSE:To improve a gas-liquid separating efficiency by installing a solution heat exchanger having a spiral heat transfer tube in a cylindrical vessel of a separator and at least one or more fins mounted in a vertical direction at the tube, and connecting a vapor inlet tube along an inner wall of the vessel. CONSTITUTION:The gas-liquid separator for an absorption refrigerator comprises a solution heat exchanger 110 spiral in a gas-liquid separator 103 and connected at its one end to an absorber 7 via a pump 8 and at the other to a generator 102. The separator 103 is formed in a cylindrical vessel and with fins 117 formed by spirally winding a heat transfer tube connected at its one side to the absorber 7 and at the other to the generator 102. A vapor tube 102a is so provided at its injection end from the generator 102 along an inner periphery of the separator 103. Thus, since dilute absorption liquid 115 flowing from the absorber 7 to the generator 102 is heated by the exchanger 110, evaporating efficiency in the generator 102 is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid separator for a vehicle-mounted absorption refrigerator.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram of a conventional vehicle-mounted absorption cooling system, FIG. 5 is a vertical sectional view of a conventional cyclone type gas-liquid separator, and FIG. 6 is a horizontal sectional view of FIG. Show.

In the system, a rare absorption liquid containing a large amount of refrigerant in the absorption liquid that has flowed out of the absorber 7 is conveyed to the generator 2 after being increased in pressure by the pump 8.

In the generator 2, the temperature of the solution is raised by the exhaust gas of the engine 1 and steam 11 is generated. This steam 1
Reference numeral 1 is a gas-liquid separator 3, which is a highly concentrated refrigerant gas 12 and a concentrated absorbent 1
4, the high-concentration refrigerant gas 12 enters the condenser 4 and is condensed and liquefied.

The liquefied refrigerant B is decompressed by the expansion valve 5, enters the evaporator 6, exchanges heat with the air, evaporates, and cools the passenger compartment.

The concentrated absorbing liquid 14 separated by the gas-liquid separator 3 is decompressed by the pressure reducing valve 9, the refrigerant gas returning from the evaporator 6 is absorbed by the absorber 7, becomes a rare absorbing liquid, and is conveyed by the pump 8 to be cycled. repeat.

Here, as the combination of the refrigerant and the absorbing liquid,
When water is used as the refrigerant, a lithium bromide solution is used as the absorbing liquid, and when the ammonia solution is used as the refrigerant, the absorbing liquid is usually used.

[0008]

The conventional gas-liquid separator for the absorption refrigerating machine described above has the following problems to be solved.

That is, in the conventional absorption type system using the refrigerant and the absorbing liquid, the separation efficiency is poor only by the separation by the gas-liquid separator 3, and the condenser 4 and the evaporator are evaporated with the absorbing liquid contained in the refrigerant vapor. It is transported to the container 6. There is a problem that the absorbing liquid that has entered the evaporator 6 is combined with the refrigerant without being evaporated and remains as a solution, which causes a reduction in the cooling effect.

Further, if the refrigerant vapor contains an absorbing liquid, the evaporating pressure is lowered. Therefore, in order to keep the absorbing temperature constant, the solution circulation amount is increased, the required heating heat amount is increased, and the like. There was a problem that the coefficient decreased.

A rectifying device or the like is effective for improving these, but it causes a new problem that the device becomes large and becomes a factor to prevent miniaturization for vehicle installation.

Regarding this, Japanese Patent Laid-Open No. 59-81468 proposes a rectifier (gas-liquid separator) having heat transfer tubes with segment fins, but since the concentrated liquid is directly sprayed,
Since a droplet or liquid film is formed on the fin surface, and because the temperature inside the heat transfer tube and the spray liquid are high, the heat transfer efficiency is low due to the small temperature difference, and the lack of compactness and high cost. There's a problem.

An object of the present invention is to provide a gas-liquid separator for an absorption refrigerator having a high gas-liquid separation efficiency that solves the above problems.

[0014]

As a means for solving the above problems, the present invention is to provide a gas-liquid separator for an absorption refrigerator as described in (1) and (2) below.

(1). In a gas-liquid separator for an absorption refrigerator that separates the vapor generated from a generator into a refrigerant gas and an absorption liquid, a spiral heat transfer tube is provided in the tubular container of the separator, and the heat transfer tube is vertically oriented. A solution heat exchanger configured by attaching at least one or more fins to the pipe, and connecting the vapor inflow pipe along the inner wall of the tubular container. Gas-liquid separator.

(2). The gas-liquid separator for an absorption refrigerator according to claim 1, wherein one end of the heat transfer tube of the solution heat exchanger is connected to the absorber and the other end is connected to the generator. Gas-liquid separator.

[0017]

Since the present invention is constructed as described above, it has the following actions.

(1). In the configuration of (1) above, since the gas-liquid separator includes the solution heat exchanger having the spiral heat transfer tube having the fins in the vertical direction, and the vapor inflow tube along the inner wall of the cylindrical container. , The refrigerant vapor containing the absorbing liquid that has been evaporated in the generator and conveyed to the gas-liquid separator through the inflow pipe is cooled in the solution heat exchanger with a low temperature, so that the absorbing liquid with a low condensation temperature condenses much. , The swirling steam flow flowing from the generator through the inflow pipe along the inner wall as it flows down through the vertical fins and blows off the condensed liquid on the spiral heat transfer pipe and the vertical fin surface. As a result, an extremely thin liquid film can be formed, and the condensate can have a low refrigerant concentration and the remaining vapor can have a high refrigerant concentration while always maintaining a high heat exchange efficiency.

This makes it possible to convey a high-concentration refrigerant to the evaporator and prevent the cooling effect from decreasing.

(2). In the configuration of (2) above, one end of the heat transfer tube of the above configuration (1) is connected to the absorber and the other end is connected to the generator, so that the dilute solution entering the generator from the absorber is a gas-liquid separator. It absorbs heat during passage and tends to evaporate in the generator.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The same components as those in the conventional example are designated by the same reference numerals,
The description is omitted except when necessary.

FIG. 1 is a circuit diagram of a vehicle-mounted absorption system using the gas-liquid separator of this embodiment, FIG. 2 is a vertical sectional view of the gas-liquid separator of this embodiment, and FIG. 3 is a plane sectional view of FIG. Is.

In these figures, 102 is a generator, 1
Reference numeral 02a denotes a steam pipe that communicates with the generator 102 along the inner circumference of the gas-liquid separator 103. Reference numeral 103 denotes a gas-liquid separator having a solution heat exchanger 110 formed of a spiral heat transfer tube therein.
10 is a solution heat exchanger having a spiral shape in the gas-liquid separator 103, one end of which is connected to the absorber 7 via the pump 8 and the other end of which is connected to the generator 102, and 117 is a solution heat exchanger 110. In the spiral portion, there are four fins vertically arranged at respective positions that divide the circumference into four equal parts when seen in a plane. Other configurations are almost the same as the conventional example.

The three-digit code attached to the pipe is mainly the name of the state of the liquid flowing through the pipe (for example, "heating liquid 1
16 ") is used to explain the operation.

Next, the operation of the above configuration will be described.

The rare absorbent 115 that has left the absorber 7 is pumped by the pump 8.
The pressure is increased by the
Entering the spiral solution heat exchanger 110 with fins 117, exchanging heat with the vapor in the gas-liquid separator 103, and heating liquid 11
It becomes 6 and is carried to the generator 102.

The mixed vapor 111 of the refrigerant and the absorbing liquid generated by the exhaust gas of the engine 1 in the generator 102 is the gas-liquid separator 1
03 through the steam pipe 102a, gas-liquid is separated, and at the same time, the solution heat exchanger 110 with the fin 117 condenses the absorbing liquid in the steam. The condensed absorbing liquid easily flows down through the fins 117, and at the same time, the generator 10
Since the absorbing liquid on the surface of the solution heat exchanger 110 is blown off by the swirling vapor stream 111a from 2, the gas-liquid can be separated without lowering the efficiency of the solution heat exchanger 110.

The refrigerant gas 112 having a high concentration due to condensation of the absorbing liquid enters the condenser 4 and is condensed and liquefied.

Of course, the fin 117 may be a fin twisted along the direction of the swirling flow.

The liquefied refrigerant B is decompressed by the expansion valve 5, enters the evaporator 6, exchanges heat with the air, evaporates, and cools the passenger compartment.

The concentrated absorbent 114 in the gas-liquid separator 103 is decompressed by the decompression valve 9 and the refrigerant gas returned from the evaporator 6 is absorbed by the absorber 7 to become a rare absorbent and the cycle is repeated.

As described above, according to the present embodiment, the gas-liquid separator 103 is formed as a cylindrical container, and the heat transfer pipes, one of which is connected to the absorber 7 and the other of which is connected to the generator 102, are spirally formed inside the container. The fins 117 are wound and attached, and the generator 102
From the above, since the steam pipe 102a is provided so that the jet end thereof is along the inner peripheral surface of the gas-liquid separator 103, the rare absorption liquid 115 flowing from the absorber 7 to the generator 102 is the solution heat exchanger 110.
Since it is heated in the part, there is an advantage that the evaporation efficiency is increased in the generator 102.

Further, the mixed steam 1 generated in the generator 102
Since 11 is blown in the tangential direction along the inner circumference of the gas-liquid separator 103, a swirling flow is formed in the gas-liquid separator 103,
This has the advantage of promoting heat exchange in the solution heat exchanger 110.

Further, the gas-liquid separator 1 is passed through the steam pipe 102a.
The mixed vapor 111 entering 03 is a swirling solution heat exchanger 1
There is an advantage that a high heat exchange efficiency can always be maintained because the absorption liquid having a lower condensing temperature is sufficiently condensed by the surface of the fin 117 and is condensed by the surface of the fin 117 and is blown away by the swirling flow.

Therefore, there is a great advantage that a high cooling effect can be achieved with a small amount of solution circulation.

[0036]

Since the present invention is constructed as described above, it has the following effects.

That is, in the present invention, the solution heat exchanger having the spiral heat transfer tubes with fins is provided in the gas-liquid separator, so that the refrigerant gas having a high concentration can be selected from the mixed vapor without increasing the size of the apparatus. Can be separated.

As a result, the influence of the absorbing liquid in the evaporator can be prevented and the cooling effect can be prevented from lowering.

Further, it is possible to prevent an increase in the solution circulation amount due to a decrease in the evaporation pressure, an increase in the required heating heat amount, etc., and the solution heat exchanger raises the temperature of the rare absorbent at the inlet of the generator. It is possible to reduce it and improve the coefficient of performance.

Further, since it can be manufactured with a simple structure, it is advantageous in terms of resources and economy.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an absorption system according to an embodiment of the present invention,

2 is a longitudinal sectional view of the gas-liquid separator in FIG. 1,

FIG. 3 is a horizontal sectional view of FIG.

FIG. 4 is a circuit diagram showing a conventional absorption system,

FIG. 5 is a vertical sectional view of a conventional gas-liquid separator,

FIG. 6 is a horizontal sectional view of FIG.

[Explanation of symbols]

 1 Engine 4 Condenser 5 Expansion Valve 6 Evaporator 7 Absorber 8 Pump 9 Pressure Reduction Valve 102 Generator 102a Steam Pipe 103 Gas-Liquid Separator 110 Solution Heat Exchanger 117 Fin

Claims (2)

[Claims] 1. A gas-liquid separator for an absorption refrigerating machine for separating vapor generated from a generator into a refrigerant gas and an absorbing liquid,
A solution heat exchanger having a spiral heat transfer tube in a tubular container of a separator, and at least one or more fins attached vertically to the heat transfer tube is installed, and an inner wall of the tubular container A gas-liquid separator for an absorption refrigerating machine, characterized in that the vapor inflow pipe is connected along the line. 2. The gas-liquid separator for an absorption refrigerator according to claim 1, wherein one end of a heat transfer tube of the solution heat exchanger is an absorber.
A gas-liquid separator for an absorption refrigerator, the other end of which is connected to a generator.