JPS6210348B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator that absorbs refrigerant vapor from an evaporator into a solution and releases the refrigerant vapor from the solution to a condenser.

First, a conventional absorption refrigerator of this type will be explained with reference to the drawings.

FIG. 1 shows a conventional single-effect absorption refrigerator using an aqueous ammonia solution, in which an absorber 1, a generator 2, a condenser 3, and an evaporator 4 are arranged in a closed pipe. The absorber 1 is connected to a pipe 5 through which a cooling source such as water flows, and the absorber 1 and the generator 2 are connected by a pair of pipes 6 and 7 that flow in opposite directions. has been done. A pump 8 is interposed in one of the pipe lines 6 to supply the ammonia aqueous solution in the absorber 1 to the generator 2. Further, an economizer 9 is arranged separately between the two pipes 6 and 7, and is configured to transfer the heat of the ammonia aqueous solution in the pipe 7 to the ammonia aqueous solution in the pipe 7.

A conduit 10 through which a heating source flows is connected to the generator 2, and an eliminator 11 is provided inside the generator 2.
is installed. The generator 2 and the condenser 3 are connected by a pipe 12. A condenser 3 is connected to a conduit 13 through which a cooling source flows, and the condenser 3 and the evaporator 4 are connected by a conduit 15 in which an expansion valve 14 is interposed. Furthermore, a pipe line 16 through which a source to be cooled flows is connected to the evaporator 4, and the evaporator 4 and the absorber 1 are connected by a pipe line 17.

According to the above-described configuration, from the absorber 1 to the pump 8
The concentrated ammonia solution pumped up reaches the generator 2 via the economizer 9, where the refrigerant ammonia is evaporated via the eliminator 11 by the heat from the pipe 10 through which the heating source flows. On the other hand, the solution in the generator 2 in which ammonia has evaporated becomes a dilute solution, which is heated by the economizer 9 and refluxed to the collector 1.

The evaporated ammonia mentioned above reaches the condenser 3 via the pipe line 12, where it is liquefied by being removed with heat by the pipe line 13 through which the cooling source flows. This liquefied ammonia expands adiabatically within the expansion valve 14 installed in the pipe line 15, and then takes away the latent heat of vaporization from the cooled source flowing through the pipe line 16 in the evaporator 4 to cool the cooled source. do. The vaporized ammonia then returns to the absorber 1 via the line 17, where it forms a concentrated ammonia solution together with the dilute solution from the line 7, completing one cycle.

A Mollier diagram of such a conventional single-effect suction refrigerator is shown in FIG. In FIG. 2, i ₂ -i _n indicates the compression work provided by the heat source in the line 10, and the pressure P _n is the pressure applied by the heat source in the line 13.
This is the condensing pressure determined by the temperature of the cooling source within. And the freezing effect is shown as i ₂ −i ₁ ′.
As can be seen from this figure, the maximum pressure in the system of this type of conventional absorption refrigerator is the condenser pressure (P _n ) determined by the temperature of the cooling source. This pressure (P
_n ) to a pressure (P ₂ ) corresponding to the temperature of the heating source in the generator 2 to eliminate the loss of effective energy of the heating source, the refrigeration effect becomes i ₂ −i ₁ , and this value is equal to the above i ₂ - i ₁ ', the drawback was that the refrigeration effect deteriorated.

The third method that improves this freezing effect is
A multi-effect absorption refrigerator shown in the figure is conventionally known. This type of absorption refrigerator has a low pressure generator 18 adjacent to the condenser 3 via an eliminator 19,
A line 12 from the generator 2 is inserted into this low pressure generator 18.
is connected.

According to the configuration described above, in the generator 2, the pipe line 10
Steam is generated at a pressure depending on the heating source within, and this steam reaches a low pressure generator 18 via a line 12, where low pressure steam is generated. Then, this steam is condensed in the condenser 3, passes through the expansion valve 14 and the evaporator 4, and exhibits a refrigeration effect.

However, the provision of the low-pressure generator 18 in this type of conventional multi-operation type absorption refrigerating machine has the disadvantage of complicating the structure and increasing cost.

The present invention has been made for the purpose of eliminating the drawbacks of the conventional ones described above, and providing an absorption refrigerator that has a simple configuration and can obtain an efficient refrigeration effect, and is also connected to a generator and a condenser. In this system, an ejector is interposed in the conduit for the evaporator, and a bypass conduit is provided to suck some of the steam from the evaporator into the ejector.

The present invention will be explained below with reference to embodiments shown in the drawings. Note that the same components as those of the conventional device described above are denoted by the same reference numerals in the drawings, and the explanation thereof will be omitted.

In FIG. 4, an ejector 20 is interposed in a pipe 12 connecting the generator 2 and the condenser 3, and the ejector 20 is connected to the evaporator 4 via a bypass pipe 21.

The Mollier diagram of an absorption refrigerator like this is the fifth
The pressure in the condenser 3 is determined by the temperature of the cooling source in line 13 (P _n ), and the pressure in the generator 2 is determined by the temperature of the heating source in line 10. is the determined pressure (P ₂ ).

According to the above-described configuration, steam at a pressure (P ₂ ) generated within the generator 2 is guided to the ejector 20 via the pipe line 12. On the other hand, this ejector 20
A portion of the generated steam from the evaporator 4 is drawn into the evaporator 4 through the bypass line 21 and compressed, and this compressed steam is mixed with the driving steam from the generator 2 described above. Next, this mixed vapor is led to the condenser 3 and liquefied, and the liquefied refrigerant is led to the evaporator 4 via the expansion valve 14 to exert a refrigeration effect.

Incidentally, the refrigeration effect in this case is _{i 2} −i _{1 ′} (FIG. 5), which is equal to the conventional i 2 − i 1 ′ shown in FIG. As a result, the refrigerating capacity of the device increases by the amount of refrigerant.

As explained above, the absorption refrigerator according to the present invention includes an ejector interposed in the pipe line that connects the generator and the condenser, and a bypass pipe line that sucks a part of the steam from the evaporator into the ejector. Because of this arrangement, the amount of refrigeration that can contribute to the refrigeration capacity increases, and an efficient refrigeration effect can be obtained despite the simple configuration.

It goes without saying that the absorption refrigerator of the present invention can be applied not only to the ammonia/water type absorption refrigerator described in the embodiment, but also to water and lithium bromide type absorption refrigerators.

[Brief explanation of the drawing]

Figure 1 is a refrigeration circuit diagram of a conventional single-effect absorption refrigerator, Figure 2 is a Mollier diagram of the absorption refrigerator shown in Figure 1, and Figure 3 is a refrigeration circuit diagram of a conventional multiple-effect absorption refrigerator. FIG. 4 is a refrigeration circuit diagram showing an embodiment of the absorption refrigerator according to the present invention, and FIG. 5 is a Mollier diagram of the absorption refrigerator shown in FIG. 4. 1...Absorber, 2...Generator, 3...Condenser, 4...Evaporator, 9...Economizer, 11...Eliminator,
20...Ejector, 21...Bypass pipe line.

Claims (1)

[Claims] 1 In an absorption refrigerator in which the absorber, generator, condenser, and evaporator are connected by a closed pipe line, and the source to be cooled is frozen by the evaporator using the heat added to the generator, the generator and condenser are also connected. 1. An absorption refrigerating machine characterized in that an ejector is interposed in a conduit for evaporating, and a bypass conduit for sucking a part of steam from an evaporator into the ejector.