JPH0353542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerating machine, specifically, a high temperature generator, a low temperature generator provided with a heat transfer tube connected to a refrigerant vapor pipe extending from the high temperature generator, and a low temperature generator extending from the low temperature generator. A transmission system comprising a condenser connected to a refrigerant vapor pipe, an evaporator connected to the condenser, and an absorber installed in a body together with the evaporator in parallel with the evaporator, and connected to a hot and cold water pipe in the body. A heat pipe is installed to form cold water. During cold water operation, refrigerant liquid is stored in a refrigerant tank to form hot water. During hot water operation, the refrigerant liquid in the refrigerant tank is released into solution to reduce the solution concentration during hot water operation. This invention relates to an absorption refrigerator.

Conventionally, this type of absorption refrigerator was developed in 1983.
The one described in Japanese Patent No. 32982 and shown in FIG. 4 is known. The one shown in Fig. 4 is part of a dual-effect absorption refrigerator, which includes a high temperature generator A, a low temperature generator (not shown), a condenser (not shown), and an evaporator (not shown). A refrigerant receiver (not shown) of the evaporator (not shown) and a refrigerant pipe (not shown) of the evaporator (not shown) and a refrigerant pipe (not shown) of the evaporator (not shown) and a refrigerant pipe B that are sequentially connected and send refrigerant from the high temperature generator A to the evaporator (not shown) during cold water operation Refrigerant pipe C connecting with A
A refrigerant tank D is interposed in the refrigerant pipe C, and a pair of on-off valves E and F are provided before and after the refrigerant tank D in order to store and release the refrigerant in the refrigerant tank D. It is.

Furthermore, apart from each of the on-off valves E and F,
The refrigerant flow is changed in cold and hot water operation, that is, in hot water operation, unlike in the above-mentioned cold water operation, the refrigerant is returned from high temperature generator A to high temperature generator A through water heater G. A cold/hot water switching valve H is installed in the refrigerant pipe B, and open/close valves K and L are installed in the intermediate concentration solution pipe I and the dilute solution pipe J, respectively, to open during cold water operation and close during hot water operation. That's what I'm doing.

As described above, conventionally, in addition to the cold/hot water switching valve H for changing the flow of refrigerant between cold water and hot water operation, on-off valves E and F for storing or releasing the refrigerant in the refrigerant tank D and solution tubes I, J
Since the on-off valves K and L are required, the number of valves used is large, which reduces the airtightness of the entire refrigerator, and makes it difficult to switch between cold and hot water operation. There was a problem of rising costs.

An object of the present invention is to enable simultaneous change in refrigerant flow when switching between cold and hot water operation and storage or release of refrigerant in a refrigerant tank by simply providing one on-off valve for switching between cold and hot water. The purpose is to solve the above-mentioned conventional problems.

To this end, the present invention provides a high temperature generator 1, a low temperature generator 2 provided with a heat transfer tube 2b connected to a refrigerant vapor pipe 8 extending from the high temperature generator 1, and a refrigerant vapor pipe 22 extending from the low temperature generator 2. A condenser 6 is connected to the condenser 6, an evaporator 3 is connected to the condenser 6, and an absorber 4 is arranged in parallel with the evaporator 3 and is housed in the body 5 together with the evaporator 3. In an absorption refrigerating machine, a refrigerant tank 19 for receiving a refrigerant liquid is connected to the outlet side of the heat exchanger tube 2b in an absorption refrigerator which enables a cold water operation for forming cold water and a hot water operation for forming hot water. Then, the first refrigerant pipe 9 communicating with the evaporator 3 is opened in the upper part of the tank 19, and the second refrigerant pipe 21 communicating with the body 5 is opened in the lower part of the tank 19. Second refrigerant pipe 21
, an on-off valve 20 that opens during hot water operation to form hot water.
By opening and closing the one on-off valve 20, refrigerant liquid is stored in the refrigerant tank 19 during cold water operation and refrigerant is distributed through the first refrigerant pipe 9, while during hot water operation It is characterized in that the refrigerant liquid stored in the refrigerant tank 19 can be discharged to the body 5 at the same time as the refrigerant is passed through the second refrigerant pipe 21.

Embodiments of the present invention will be described below based on the drawings.

The one shown in FIG. 1 is a dual-effect absorption refrigerating machine, which has a city gas burner 1a, and is referred to later as a direct-fired high-temperature generator 1 that heats a solution by combustion of the burner 1a. It is equipped with a low temperature generator 2 provided with a heat transfer tube 2b connected to a refrigerant evaporation tube 8, an evaporator 3 and an absorber 4 are housed in one body 5, and a condenser 6 is configured in the upper part of this body 5. The body 7 is integrally connected.

The refrigerant vapor pipe 8, the first refrigerant pipe 9, and the refrigerant liquid pipe 10 are provided to connect the high temperature generator 1, the low temperature generator 2, the condenser 6, and the evaporator 3, respectively,
The refrigerant vapor generated in the high temperature generator 1 is condensed and sent to the evaporator 3. Further, the condenser 6 is connected to the refrigerant vapor pipe 22 extending from the low temperature generator 2.
are connected.

Furthermore, an intermediate concentration solution pipe 11 for conveying an intermediate concentration solution from the high temperature generator 1 to the low temperature generator 2, a concentrated solution tube 12 for conveying a concentrated solution from the low temperature generator 2 to the absorber 4, and a high temperature generator 1 from the absorber 4. A dilute solution tube 13 for returning the dilute solution is provided in each. The dilute solution pipe 13 is provided with a solution pump 1 on the way.
4 is interposed, and a high temperature side heat is provided on the discharge side of the solution pump 14 for heat exchange between the dilute solution flowing through the dilute solution tube 13 and the intermediate concentration solution flowing through the intermediate concentration solution tube 11. An exchanger 15 and a low-temperature side heat exchanger 16 for exchanging heat between the dilute solution and the refrigerant liquid flowing through the first refrigerant pipe 9 and the concentrated solution flowing through the concentrated solution pipe 12 are interposed.

Further, a cold/hot water pipe 17 is connected to the heat transfer tube 3a of the evaporator 3, and a heat transfer tube 4 of the absorber 4 is connected to the heat transfer tube 3a of the evaporator 3.
A and the heat transfer tube 6a of the condenser 6 are connected to a cooling water pipe 18, so that cold water can be taken out during cold water operation to form cold water, and hot water can be taken out during hot water operation to form hot water.

In the absorption refrigerating machine shown in FIG. 1, the refrigerant tank 19 is connected to the second
As enlarged in the figure, the heat transfer tube 2b is provided integrally with the lower part of the low temperature generator 2, and one end of the heat transfer tube 2b provided in the low temperature generator 2 is communicated with the refrigerant vapor pipe 8 via the header 2a. The other end of the heat pipe 2b is communicated via the header 2c with a refrigerant tank 19 that receives the refrigerant liquid condensed in the low temperature generator 2, and the first refrigerant pipe 9 is opened at the upper part of the refrigerant tank 19, while the refrigerant tank 19, a second refrigerant pipe 21 communicating with the body 5 is opened,
In the middle of the second refrigerant pipe 21, there is an on-off valve 20 for switching between cold and hot water, which opens during hot water operation to form hot water.
It is to intervene.

By closing the on-off valve 20, the refrigerant liquid condensed in the low temperature generator 2 can be stored in a portion of the tank 19 below the inlet of the first refrigerant pipe 9. There is.

Next, the operation of the absorption refrigerating machine constructed as above will be explained.

First, a case will be described in which cold water operation is performed by closing the on-off valve 20 for switching between cold and hot water.

First, when the burner 1a is burned to heat the high-temperature generator 1, the dilute solution in the vessel is heated to boiling, and the refrigerant vapor is transferred from the high-temperature generator 1 to the high-temperature side heat in the low-temperature generator 2. Heat is radiated to the intermediate concentration solution introduced through the exchanger 15, and a portion of the solution condenses to become a gas-liquid mixture that flows into the refrigerant tank 19 from the header 2c.

At this time, since the on-off valve 20 is closed, the refrigerant liquid in the gas-liquid mixture that has flowed into the refrigerant tank 19 is such that the liquid level of the refrigerant tank 19 is at the position of the inlet of the first refrigerant pipe 9. The refrigerant is stored in the refrigerant tank 19 until the refrigerant reaches . When the liquid level becomes the same as the inlet position, all the refrigerant flowing into the refrigerant tank 19 is discharged into the first refrigerant pipe 9. Further, the refrigerant liquid discharged into the first refrigerant pipe 9 is cooled by the low temperature side heat exchanger 16 and further sent to the condenser 6.

On the other hand, refrigerant vapor generated from the intermediate solution in the low temperature generator 2 flows into the condenser 6 via the refrigerant vapor pipe 22.

The refrigerant flowing into the condenser 6 radiates heat to the cooling water flowing through the heat transfer tubes 6a and is completely condensed. The liquid refrigerant from the condenser 6 is then transferred to a refrigerant liquid pipe 10.
enters the evaporator 3 through the heat exchanger tube 3a, is dispersed into the heat exchanger tube 3a through the dispersion device 3b, and is dispersed into the heat exchanger tube 3a through the dispersion device 3b.
It takes heat from the flowing water and evaporates it, forming cold water.

The refrigerant vapor evaporated in the evaporator 3 flows into the absorber 4 via an eliminator (not shown), and is transferred from the low temperature generator 2 to the low temperature side heat exchanger 1.
The refrigerant vapor is absorbed into the concentrated solution that enters the absorber 4 through the refrigerant vapor.
The solution pump 14 returns the solution to the high temperature generator 1 via the dilute solution pipe 13, the low temperature side heat exchanger 16 and the high temperature side heat exchanger 15.

As mentioned above, during cold water operation, by closing the cold/hot water switching valve 20, the refrigerant is allowed to flow through the first refrigerant pipe 9, and at the same time, the refrigerant liquid condensed in the low temperature generator 2 is The solution can be stored in the refrigerant tank 19, and the concentration of the solution can therefore be increased to a predetermined value suitable for cold water operation.

Next, a case will be described in which hot water operation is performed by opening the on-off valve 20 for switching between cold and hot water.

Note that in this case, water flow through the cooling water pipe 18 is stopped.

First, by opening the on-off valve 20, all of the refrigerant stored in the refrigerant tank 19 is released into the evaporator 3 and into the dilute solution via the second refrigerant pipe 21. be.

Similarly to the cold water operation, the high temperature refrigerant vapor generated in the high temperature generator 1 becomes a gas-liquid mixture in the low temperature generator 2 and flows into the refrigerant tank 19.

This time, since the on-off valve 20 is open, the refrigerant flowing into the refrigerant tank 19 is not stored in the refrigerant tank 19 at all, and is passed through the second refrigerant pipe 21 from the bottom of the tank 19. It is sent to the evaporator 3 via the evaporator 3.

Note that the flow resistance of the first refrigerant pipe 9 is considerably larger than the flow resistance of the second refrigerant pipe 21 because it passes through the low-temperature side heat exchanger 16. Almost no refrigerant flows out.

Further, the refrigerant vapor generated in the low temperature generator 2 passes through the condenser 6 and is not condensed until it reaches the evaporator 3.
It is sent to.

The refrigerant vapor that has flowed into the evaporator 3 releases heat of condensation to the water flowing through the heat transfer tube 3a, heats the water and condenses, and then forms a concentrated solution that flows from the low temperature generator 2 into the absorber 4. The dilute solution is mixed and returned to the high temperature generator 1 from the lower part of the absorber 4 via the dilute solution pipe 13.

As described above, by opening the on-off valve 20 for cold/hot water switching, the refrigerant is allowed to flow through the second refrigerant pipe 21, and at the same time, all the refrigerant liquid stored in the refrigerant tank 19 is turned into solution. The concentration of the solution can be lowered to a predetermined value for operation.

Therefore, according to this embodiment, operations for storing and discharging refrigerant liquid in the refrigerant tank 19 can be carried out by using only one on-off valve 20 for switching between cold and hot water to change the flow of the refrigerant. The number of on-off valves used can be reduced compared to the conventional method. Therefore,
Since the number of on-off valves is small, the airtightness of the refrigerator is improved accordingly, the operation when switching between cold and hot water is facilitated, and manufacturing costs can also be reduced.

Furthermore, in this embodiment, since the refrigerant tank 19 is integrally provided at the lower part of the low temperature generator 2, the upper surface of the refrigerant tank 19 can also be used as a heat transfer surface to the solution in the low temperature generator 2, so that cold water operation is possible. This allows for more efficient operation at times.

In the above embodiment, the refrigerant tank 19 was installed in the refrigerant pipe connecting the low temperature generator 2 and the condenser 6, but as shown in FIG. It may also be installed in a refrigerant pipe that connects the In that case, the first refrigerant pipe 9 connected to the evaporator 3 is opened at the top of the refrigerant tank 19, and an on-off valve 20 for switching between cold and hot water is installed at the bottom, which is also connected to the evaporator 3. The second refrigerant pipe 21
It opens the door.

In FIG. 3, 25 is a refrigerant pipe connecting the low temperature generator 2 and the condenser 6, and the other numbers are the same as in the previous embodiment.

Further, in the above embodiment, the second refrigerant pipe 21, one end of which was opened at the bottom of the refrigerant tank 19, was opened at the evaporator 3 side of the body 5, but the other end was opened at the absorber 4 side. Good too. In this case, hot water is formed by heating the water flowing through the heat transfer tubes 4a of the absorber 4 by absorbed heat.

As described above, the present invention includes a high temperature generator 1, a low temperature generator 2 provided with a heat transfer tube 2b connected to a refrigerant vapor pipe 8 extending from the high temperature generator 1, and a refrigerant vapor pipe 22 extending from the low temperature generator 2. A condenser 6 connected to the body 5, an evaporator 3 connected to the condenser 6, and an absorber 4 installed in parallel with the evaporator 3 and housed in the body 5 together with the evaporator 3. In an absorption refrigerator that is provided with a heat transfer tube connected to a water tube and enables a cold water operation for forming cold water and a hot water operation for forming hot water, a refrigerant tank 19 for receiving refrigerant liquid is communicated with the outlet side of the heat transfer tube 2b. Then, a first refrigerant pipe 9 communicating with the evaporator 3 is opened in the upper part of the tank 19, and a second refrigerant pipe 21 communicating with the body 5 is opened in the lower part of the tank 19, Said second refrigerant pipe 21
, an on-off valve 20 that opens during hot water operation to form hot water.
, the refrigerant flow during cold/hot water operation can be changed by opening/closing the on-off valve 1 by simply using one on-off valve 20 for switching between cold and hot water, and the flow of refrigerant in the refrigerant tank 19 can be changed by opening and closing the on-off valve 1. It is also possible to switch between storage and release. Therefore, there is no need to separately provide an on-off valve just for storing and discharging the refrigerant in the refrigerant tank 19, so the number of on-off valves used can be reduced compared to the conventional art.

As a result, the airtightness of the absorption refrigerator can be improved by reducing the number of on-off valves, and
It is possible to easily switch between cold and hot water operation, and furthermore, it is possible to reduce manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a piping system diagram showing an embodiment of the present invention, Fig. 2 is a side sectional view of the main part of the above embodiment, Fig. 3 is a partial view of another embodiment, and Fig. 4 is a diagram of a conventional example. FIG. 1...High temperature generator, 2...Low temperature generator, 2b...
...heat exchanger tube, 3...evaporator, 4...absorber, 5...
Body, 6... Condenser, 8... Refrigerant vapor pipe, 9...
1st refrigerant pipe, 19... Refrigerant tank, 20... Open/close valve, 21... Second refrigerant pipe.

Claims (1)

[Claims] 1 A high temperature generator 1, a low temperature generator 2 provided with a heat transfer tube 2b connected to a refrigerant vapor pipe 8 extending from this high temperature generator 1, and a condenser 6 connected to a refrigerant vapor pipe 22 extending from this low temperature generator 2. And this condenser 6
an evaporator 3 connected to the evaporator 3; and an absorber 4 which is connected to the evaporator 3 and is housed in the body 5 together with the evaporator 3; This is an absorption refrigerator that enables a cold water operation to generate hot water and a hot water operation to generate hot water, in which a refrigerant tank 19 for receiving refrigerant liquid is communicated with the outlet side of the heat transfer tube 2b, and an upper part of the tank 19 is provided with: A first refrigerant pipe 9 communicating with the evaporator 3 is opened, and a second refrigerant pipe 21 communicating with the body 5 is opened at the lower part of the tank 19, while hot water is supplied to the second refrigerant pipe 21. An absorption refrigerating machine characterized by being equipped with an on-off valve 20 that opens during hot water operation.