JPS6342290Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] This invention relates to a dual-effect absorption refrigerating machine, and particularly to a dual-effect absorption refrigerating machine that prevents solution from flowing into the cooling solution circulation circuit during heating. It is something.

[Background of the idea]

For example, as shown in FIG. 1, a conventional dual-effect absorption refrigerator of this type includes a high-temperature regenerator 1 that heats a dilute solution with a heat source such as a boiler, and a solution heated by the high-temperature regenerator 1. a separator 2 that takes in and separates it into refrigerant vapor and an intermediate concentrated solution; a high-temperature heat exchanger 3 that takes in the intermediate concentrated solution from the separator 2 through an intermediate concentrated solution extraction pipe 11 and exchanges heat; Vessel 3
a low-temperature regenerator 4 that takes in the intermediate concentrated solution heat-exchanged with the separator 2, takes in the refrigerant vapor separated by the separator 2, condenses a part of the refrigerant vapor, and obtains a concentrated solution from the intermediate concentrated solution; A heat exchanger 5 that exchanges heat with the concentrated solution from the heat exchanger 5, and an absorber 6 that absorbs the refrigerant by dispersing the concentrated solution from the heat exchanger 5.
An evaporator 7 that sprays liquid refrigerant to obtain cold water; a condenser 8 that takes in refrigerant vapor from the low-temperature regenerator 4 and cools it with cooling water to obtain liquid refrigerant and supplies it to the evaporator 7; A solution circulation pump 9 that pressurizes the dilute solution in order to supply the dilute solution obtained in step 7 to the high-temperature regenerator 1 via the low-temperature heat exchanger 5 and the high-temperature heat exchanger 3.
It is installed in the heating circuit pipe 13 connecting the separator 2 and the evaporator 7, and the separator 2 and the evaporator 7 are connected during heating.
and a heating/cooling switching valve 10 that communicates with the air conditioner.

A refrigerator configured as described above will be explained.

First, the operation during cooling will be explained.

During cooling, the solution heated in the high-temperature regenerator 1 is separated into refrigerant vapor and intermediate concentrated solution in the separator 2. The intermediate concentrated solution after separation is transferred to high temperature heat exchanger 3.
It is sent to the low temperature regenerator 4 via. The intermediate concentrated solution flowing from the separator 2 to the low temperature regenerator 4 is determined by the difference between the internal pressure of the separator 2 and the internal pressure of the low temperature regenerator 4, and between the intermediate concentrated solution outlet position of the separator 2 and the low temperature regenerator 4. Depending on the position of the concentrated solution inlet 12, it flows from the separator 2 to the low temperature regenerator 4. In the low temperature regenerator 4, the intermediate concentrated solution is further separated into a concentrated solution and a refrigerant vapor by the refrigerant vapor from the separator 2. Further, a part of the refrigerant vapor from the separator 2 is condensed to become a gas-liquid mixture, and is supplied to the condenser 8 together with the refrigerant vapor generated in the low-temperature regenerator 4.

The concentrated solution obtained in the low temperature regenerator 4 is transferred to the low temperature heat exchanger 5.
It is supplied to the absorber 6 via. The absorber 6 is
It is in communication with an evaporator 7 , and a concentrated solution is sprayed onto heat transfer tubes 60 in the absorber 6 . In the evaporator 7, the liquid refrigerant from the condenser 8 is sprayed onto the heat transfer tubes 70, and the liquid refrigerant is evaporated by the spraying of the concentrated solution. Therefore, cold water can be taken out by flowing water through the heat transfer tubes 70.

Next, the operation during heating will be explained.

During heating, the heating/cooling switching valve 10 is opened, and the steam and concentrated solution from the high-temperature regenerator 1 are guided to the evaporator 7 through the separator 2, heating the heat exchanger tube 70 in the evaporator 7, and the heat exchanger tube 70 is heated. Hot water is obtained by running water. In such conventional technology, during heating, the heated solution flows into the low temperature regenerator 4 due to the internal pressure of the separator 2, and the heated solution flows through the cooling solution circulation circuit to the heat transfer tubes 60 of the absorber 6.
This caused the problem that the heat exchanger tubes 60 were corroded. In order to prevent such harmful effects, the following measures have conventionally been taken.

That is, first, in order to lower the internal pressure of the separator 2 during heating, measures should be taken to increase the dimensions of the heating circuit pipe 13 leading to the evaporator 7 and the switching valve 10.

Second, take measures to lower the position of the separator 2 so that there is a large positional difference between the intermediate concentrated solution outlet of the separator 2 and the intermediate concentrated solution intake of the low temperature regenerator 4.

However, if the above measures are taken, the following drawbacks arise. In other words, in the case of the first measure,
The increase in size of the heating circuit pipe 13 and the switching valve 10 is excessive considering the heating operation function, and therefore the product price becomes expensive. In the case of the second measure, since the positional difference between the separator 2 and the low-temperature regenerator 4 is increased, it becomes impossible to shorten the solution circulation time at the time of starting cooling.

[Purpose of invention]

The purpose of this invention is to provide a dual-effect absorption refrigerating machine that can eliminate the above-mentioned drawbacks, prevent solution circulation to the cooling solution circulation circuit during heating, and shorten the solution circulation time at the start of cooling operation. It is in.

[Summary of the idea]

In order to achieve the above objective, this invention was developed to connect the separator side intake of the intermediate concentrated solution circulation circuit from the gas-liquid separator to the low-temperature regenerator in a dual-effect absorption refrigerating machine, and from the separator to the evaporator. It is characterized by having a branch from the heating circuit.

[Example of idea]

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 2 is a system diagram showing an embodiment of the dual-effect absorption refrigerator according to this invention. In FIG. 2, the same components as those of the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

The difference between the embodiment shown in FIG. 2 and the conventional example is that the intake port 12 on the separator 2 side of the intermediate concentrated solution extraction pipe 11 leading from the gas-liquid separator 2 to the low-temperature regenerator 4 is connected to the evaporator from the separator 2. It is located at a point where it branches from the heating circuit pipe 13 leading to , and the other configurations are no different.

The operation of the embodiment configured as described above will be explained below.

First, the case of cooling operation will be explained.

The solution heated in the high temperature regenerator 1 is separated into refrigerant vapor and intermediate concentrated solution in the separator 2. The intermediate concentrated solution after separation flows into the heating circuit pipe 13 connected to the bottom of the separator 2.

During cooling, the air conditioning/heating switching valve 10 is closed, so the intermediate concentrated solution that has flowed into the heating circuit pipe 13 enters the intermediate concentrated solution extraction pipe 11 branched from the heating circuit pipe 13 and passes through the high temperature heat exchanger 3. It is then supplied to the low temperature regenerator 4. The concentrated solution from the low temperature regenerator 4 is passed through the low temperature heat exchanger 5 to the heat exchanger tubes 6 of the absorber 6.
Distributed to 0. By the way, according to this implementation, the bottom of the separator 2 and the concentrated solution intake port 1 of the low-temperature regenerator 4
Since the positional difference between separator 2 and low-temperature regenerator 4 can be made small, solution circulation becomes easy even when the pressure difference between separator 2 and low-temperature regenerator 4 is small.

On the other hand, during heating operation, the switching valve 10 is in an open state, so the heated solution and steam that have flowed into the separator 2 flow into the evaporator 7 at high speed through the heating circuit pipe 13 and the switching valve 10, and the evaporator Heat exchanger tube 7 in 7
Heat 0. At this time, the inlet part (branch part) of the intermediate concentrated solution extraction pipe 11 branched from the heating circuit pipe 13
Since the solution and steam flow into the evaporator 7 at a high velocity within the heating circuit pipe 13, the pressure at 12 is subject to a pressure drop corresponding to the water head of the velocity. Therefore, the pressure in the inlet section 12 is lower than the pressure in the separator 2 at that time. Therefore, the intermediate concentrated solution can be prevented from circulating through the intermediate concentrated solution extraction pipe 11 into the cooling circuit.

At the branch part 12 of the intermediate concentrated solution extraction pipe 11, the pressure drop as described above is obtained. Therefore, in order to reduce the pressure inside the separator 2 to a predetermined pressure or less, the dimensions of the heating circuit 13 and the switching valve 10 are oversized. There is no need to take measures to do so. Furthermore, restrictions on the rise in the position of the separator 2 are reduced, and the difference in position between the separator 2 and the low-temperature regenerator 4 can be reduced.

[Effects of the invention] As described above, according to this invention, the separator intake of the intermediate concentrated solution circulation circuit from the low-temperature regenerator to the low-temperature regenerator is branched from the heating circuit from the separator to the evaporator. Therefore, it is possible to prevent high temperature solution from circulating to the cooling circuit during heating operation.
In addition, there is an effect that the solution circulation time at the time of starting cooling can be shortened.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a conventional example, and FIG. 2 is a system diagram showing an embodiment of the dual-effect absorption refrigerator according to this invention. 1... High temperature regenerator, 2... Separator, 3... High temperature heat exchanger, 4... Low temperature regenerator, 5... Low temperature heat exchanger, 6... Absorber, 7... Evaporator, 8... ... Condenser, 9 ... Solution circulation pump, 10 ... Air conditioning/heating switching valve, 11 ... Intermediate concentrated solution extraction pipe, 12 ... Intake port, 13 ... Heating circuit pipe.

Claims (1)

[Scope of utility model registration request] A high-temperature regenerator that heats a dilute solution, a separator that separates the solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentrated solution, and an intermediate concentrated solution from the separator that is heated through an intermediate concentrated solution pipe. a low-temperature regenerator for introducing the refrigerant vapor into a high-temperature heat exchanger for heat exchange and then taking in the refrigerant vapor to obtain a concentrated solution; an absorber that absorbs the refrigerant taken in after heat exchange; a condenser that cools the refrigerant vapor into a liquid refrigerant; an evaporator that evaporates the liquid refrigerant from the condenser; A dual-effect absorption system comprising a circulation pump that sends the dilute solution to a high-temperature regenerator via a low-temperature heat exchanger and a high-temperature heat exchanger, and a heating circuit communicating the evaporator and separator and having a cooling/heating switching valve. A double-effect absorption refrigerator, characterized in that the intermediate concentrated solution pipe on the separator side is branched from the heating circuit.