JP2001317836A - Method for controlling absorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the circulation of a liquid absorbent by an inexpensive method, and operate the main body of an absorption refrigerator, even if the controller is broken. SOLUTION: In the absorption refrigerator, the circulation path, of the absorbent and a coolant is formed by connecting with pipes a high temperature regenerator 1, a low temperature regenerator 2, a condenser 3, an evaporator 4, and an absorber 5. An absorbent pipe 8 is provided from the absorber 5 to the regenerator 1. An absorbent pipe 11 with a flow control valve 12 is provided from the pipe 8 to the absorber 5. A level sensor S1 senses the level of the absorbent in the regenerator 1. When the sensed level is low, the valve travel of the valve 12 is reduced, when it is high, the valve travel is increased. The amount of inflow to the regenerator 1 is regulated, so that the level of the absorbent heated in the regenerator 1 is controlled in a certain range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator.

[0002]

2. Description of the Related Art The amount of circulating absorption liquid in an absorption refrigerator is:
It depends on the rotation speed of the absorbent pump, and if the rotation speed is constant, the circulation amount is also substantially constant. However, the amount discharged from the high-temperature regenerator depends on the pressure difference between the high-temperature regenerator and the low-temperature regenerator.

[0003] For this reason, in an absorption refrigerator, it is necessary to control the circulation amount of the absorption liquid.
Based on the pressure, etc., the amount of circulation of the absorbing liquid (and the refrigerant) is controlled by controlling the rotation speed of the absorbing liquid pump, controlling the flow control valve installed in the absorbing liquid pipe leading to the high temperature regenerator, and the like. I have to.

[0004]

However, the method of controlling the number of revolutions of the absorbent pump by, for example, an inverter, and the use of a large-diameter control valve installed in the absorbent pipe from the absorber to the high-temperature regenerator also increase the cost. There is a problem.

[0005] Further, there is a problem that even if the control means fails, the absorption chiller main body cannot be operated, and the amount of circulation of the absorbing liquid (and the refrigerant) can be controlled by an inexpensive method. In addition, even if the control means breaks down, it is necessary to enable the operation of the absorption chiller main body, which has been a problem to be solved.

[0006]

According to the present invention, as a specific means for solving the above-mentioned problems in the prior art, a rare absorbing liquid having absorbed a large amount of refrigerant is heated to evaporate and separate the refrigerant, and the separated rare absorbing liquid is heated. A high-temperature regenerator for obtaining a refrigerant vapor and an intermediate absorbent; and an intermediate absorbent generated and supplied by the high-temperature regenerator, heated by the refrigerant vapor generated by the high-temperature regenerator to further evaporate and separate the refrigerant. A low-temperature regenerator that obtains a refrigerant vapor and a concentrated absorption liquid from a low-temperature regenerator, and supplies a refrigerant liquid that is heated and condensed by the intermediate absorption liquid, and cools the refrigerant vapor that is generated and supplied by the low-temperature regenerator And a refrigerant liquid supplied from the condenser and accumulated in the refrigerant liquid reservoir is sprayed on the heat transfer tubes by the refrigerant pump, and the refrigerant removes heat from the fluid flowing in the heat transfer tubes, so that the refrigerant is removed. The evaporator that evaporates and the evaporator In the refrigerant vapor to be fed with refrigerant vapor from the low temperature regenerator is absorbed in concentrated absorbent liquid which is supplied to separate the diluted absorption liquid, the absorption refrigerating machine comprising an absorber supplied to the high temperature regenerator,

An absorbent return pipe provided with a valve is provided between the absorber and the absorbent pipe from the absorber to the high-temperature regenerator, and the valve of the absorbent return pipe is controlled to control the absorbent in the high-temperature regenerator. A control method of the first configuration for controlling the liquid level of

A part or the entire length of the absorption liquid pipe from the absorber to the high temperature regenerator is constituted by a plurality of absorption liquid pipes, and one of the absorption liquid pipes is provided with a valve, and the valve is controlled to control the high temperature. The second control is to control the liquid level of the absorbing liquid in the regenerator.
How to control the configuration of

The control method according to the first or second structure, wherein the opening degree of the valve is controlled based on the level of the absorbing liquid in the high-temperature regenerator, and

The control method according to the first or second configuration, wherein the opening degree of the valve is controlled based on the pressure in the high-temperature regenerator; and

The control method according to the first or second structure, wherein the opening degree of the valve is controlled based on the temperature of the absorbing liquid in the high-temperature regenerator, and

The control method according to the first or second configuration, wherein the opening degree of the valve is controlled based on the temperature of the cooling water supplied to the absorber and the condenser; and To solve the above-mentioned problem of the prior art.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below in detail with reference to FIGS. The absorption refrigerator illustrated in FIG. 1 can perform cooling operation such as cooling by using water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorption liquid and circulating and supplying cold water to a load (not shown). It is a heavy-effect absorption refrigerator and has a gas burner 1
B, high-temperature regenerator 1, low-temperature regenerator 2, condenser 3, evaporator 4, absorber 5, low-temperature heat exchanger 6, high-temperature heat exchanger 7,
Absorbent pipes 8 to 11, flow control valve 12, absorbent pump 1
3, refrigerant pipes 14 to 16, a refrigerant pump 17, a chilled water pipe 18 through which chilled water circulating and supplied to a cooling load (not shown), a cooling water pipe 19, and the like are connected by piping.

In the double effect absorption refrigerating machine having the above structure, when cooling water is supplied to the cooling water pipe 19, the gas burner 1B is ignited and the high temperature regenerator 1 heats the absorbing liquid, the refrigerant vapor evaporates and separates from the absorbing liquid. Then, an intermediate absorbent having a higher concentration of the absorbent by separating the refrigerant vapor is obtained.

The high-temperature refrigerant vapor generated by the high-temperature regenerator 1 enters the low-temperature regenerator 2 through the refrigerant pipe 14, and is generated by the high-temperature regenerator 1 and passes through the high-temperature heat exchanger 7 by the absorbing liquid pipe 9. Then, the intermediate absorbing liquid that has entered the low-temperature regenerator 2 is radiated and condensed by heating and enters the condenser 3.

The refrigerant heated in the low-temperature regenerator 2 and evaporated and separated from the intermediate absorption liquid enters the condenser 3 and enters the cooling water pipe 1.
The refrigerant exchanges heat with water flowing in the pipe 9 to be condensed and liquefied, and enters the evaporator 4 through the refrigerant pipe 15 together with the refrigerant condensed and supplied from the refrigerant pipe 14.

The refrigerant liquid that has entered the evaporator 4 and accumulated in the refrigerant liquid reservoir is sprayed by a refrigerant pump 17 onto a heat transfer tube 18A connected to a chilled water pipe 18, and is supplied with water supplied through the chilled water pipe 18. The heat exchange evaporates and cools the water flowing inside the heat transfer tube 18A.

The refrigerant evaporated by the evaporator 4 enters the adjacent absorber 5 and is heated by the low-temperature regenerator 2 to evaporate and separate the refrigerant. Is supplied through the low-temperature heat exchanger 6 and is absorbed by the concentrated absorbent sprayed from above.

The absorption liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 5, that is, the rare absorption liquid, is supplied to the absorption liquid pump 1.
By the operation of 3, the liquid is sent from the absorbing liquid pipe 8 to the high-temperature regenerator 1 via the low-temperature heat exchanger 6 and the high-temperature heat exchanger 7, and
A part is returned to the absorber 5 via the absorbent pipe 11 provided with the flow control valve 12.

The diameter of the flow control valve 12 for returning a part of the absorbing liquid to the absorber 5 (also the diameter of the absorbing liquid pipe 11) is
When the flow control valve 12 is fully opened, it is formed with a minimum diameter at which the amount of the absorbing liquid supplied to the high temperature regenerator 1 becomes zero. In this case, since the supply destination of the absorbing liquid, that is, the pipe pressure difference due to the internal pressure difference between the high-temperature regenerator 1 and the absorber 5, the head difference, and the pipe length difference is large, the flow control valve 1 provided in the absorbing liquid pipe 11
2 can be smaller than the diameter of the flow control valve (also the diameter of the absorption liquid pipe 11) which is provided in the absorption liquid pipe 8 and controls the absorption liquid flowing therethrough.

When the absorption refrigerator is operated as described above, the chilled water cooled by the heat of vaporization of the refrigerant in the heat transfer pipe 18A provided inside the evaporator 4 is cooled by the chilled water pipe 18 through a chilled water pipe 18. Since the load can be circulated, the cooling operation can be performed.

Reference numeral C denotes a controller provided in the double effect absorption refrigerator having the above-described operation functions, which is provided with a microcomputer, a storage means, and the like, and is used for circulating and supplying cold water to a cooling load (not shown). Heat transfer tube 1 of evaporator 4 to cold water tube 18
The temperature information of the chilled water flowing out of 8A is taken in, and the opening of the heating amount control valve connected to the gas burner 1B is adjusted so that the evaporator outlet side temperature of the chilled water is maintained at a predetermined set temperature. It has a conventionally well-known capacity control function for controlling the amount of heat input to the vessel 1.

That is, the controller C operates the refrigerant pump 17 when the temperature of the chilled water flowing out of the evaporator 4 to the chilled water pipe 18 is higher than a preset temperature, and also controls the setting temperature and the temperature of the chilled water. As the difference is larger, the opening of the heating amount control valve connected to the gas burner 1B is increased, and when the temperature of the cold water reaches the set temperature, the opening of the heating amount control valve is suppressed to the set opening, A control program for performing normal capacity control such as closing is stored in the storage means.

Further, the controller C controls the liquid level of the absorbing liquid heated by the high-temperature regenerator 1 based on the liquid level of the absorbing liquid detected by the liquid level sensor S1 so that the liquid level of the absorbing liquid is maintained at a predetermined level. For example, as shown in FIG. 2, a control program for controlling the opening of the flow control valve 12 is also provided in the storage means.

That is, in this absorption refrigerator, the lower the liquid level of the absorption liquid heated in the high-temperature regenerator 1 is below the predetermined liquid level, the lower the flow control valve 12 becomes.
Is decreased, whereby the amount of the absorbing liquid returned to the absorber 5 through the absorbing liquid pipe 11 decreases, and the amount of the rare absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 increases. The liquid level of the absorbing liquid in the high-temperature regenerator 1 gradually rises and returns to the set level.

On the other hand, as the liquid level of the absorbing liquid heated in the high-temperature regenerator 1 is higher than a predetermined liquid level, the opening of the flow control valve 12 is increased, whereby the absorbing liquid pipe 11 is opened. The amount of the absorbing liquid returned to the absorber 5 via the absorber 5 increases, and the amount of the diluted absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 decreases. Therefore, the level of the absorbing liquid in the high-temperature regenerator 1 gradually increases. Return to the set level.

As described above, in the absorption refrigerator of the present invention, it is possible to control the level of the absorption liquid to be heated in the high-temperature regenerator 1 so as to always fall within a certain range. Moreover,
The diameter of the flow control valve 12 provided in the absorption liquid pipe 11 can be made smaller than that of the flow control valve provided in the absorption liquid pipe 8 and controlling the amount of the absorption liquid flowing into the high-temperature regenerator 1, so that it is economical. And the additionally provided flow control valve 1
Even if 2 fails, the absorption liquid can be supplied from the absorber 5 to the high-temperature regenerator 1, so that there is no inconvenience that a cooling operation such as cooling cannot be performed.

The opening of the flow control valve 12 may be controlled by the controller C as shown in FIG. 3, for example, based on the pressure in the high temperature regenerator 1 detected by the pressure sensor S2.

That is, the opening degree of the flow control valve 12 is increased as the pressure in the high-temperature regenerator 1 is lower than a predetermined pressure and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is smaller. As a result, the absorber 5 can be
The amount of the absorbing liquid returned to
When the amount of the rare absorbing solution supplied to the
It can be avoided that the level of the absorbing liquid to be heated inside gradually rises.

On the other hand, as the pressure in the high-temperature regenerator 1 is higher than a preset pressure and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is larger, the opening degree of the flow control valve 12 is reduced. Accordingly, when the amount of the absorbing liquid returned to the absorber 5 through the absorbing liquid pipe 11 is reduced and the amount of the diluted absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 is increased, the heating is performed in the high-temperature regenerator 1. It can be avoided that the liquid level of the absorbing liquid gradually decreases.

The opening degree of the flow control valve 12 is determined by the controller C based on the temperature of the absorbent in the high-temperature regenerator 1 detected by the temperature sensor S3 and the temperature of the cooling water detected by the temperature sensor S4. For example, the control may be performed as shown in FIG.

That is, the opening degree of the flow control valve 12 is increased as the temperature in the high-temperature regenerator 1 is lower than the preset temperature and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is smaller. As a result, the absorber 5 can be
The amount of the absorbing liquid returned to
High-temperature regenerator 1
It can be avoided that the level of the absorbing liquid to be heated inside gradually rises.

On the other hand, as the temperature in the high-temperature regenerator 1 is higher than the preset temperature and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is larger, the opening degree of the flow control valve 12 is reduced. Accordingly, even if the amount of the absorbing liquid returned to the absorber 5 via the absorbing liquid pipe 11 is reduced and the amount of the diluted absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 is increased, the heating in the high-temperature regenerator 1 is performed. It can be avoided that the liquid level of the absorbing liquid gradually drops.

The lower the temperature of the cooling water detected by the temperature sensor S4, the lower the regeneration pressure in the high-temperature regenerator 1 and the smaller the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9, the lower the flow rate. Increasing the opening of the control valve 12,
As a result, the amount of the absorbing liquid returned to the absorber 5 via the absorbing liquid pipe 11 is increased, and the amount of the diluted absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 is reduced. It can be avoided that the level of the absorbing liquid gradually rises.

On the other hand, as the temperature of the cooling water detected by the temperature sensor S4 is higher, the regeneration pressure in the high-temperature regenerator 1 is higher, and the larger the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9, the larger the flow rate. Since the opening degree of the control valve 12 is reduced, the amount of the absorbing liquid returned to the absorber 5 through the absorbing liquid pipe 11 is reduced, and the amount of the diluted absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 is increased. In addition, it can be avoided that the level of the absorbing liquid to be heated in the high-temperature regenerator 1 gradually decreases.

When the flow rate control valve 12 is fully opened, the amount of the dilute absorbent supplied from the absorber 5 to the high-temperature regenerator 1 does not become zero, but is only reduced to half in the high-temperature regenerator 1. The liquid level of the absorbing solution can be controlled sufficiently,
Since the liquid level can be controlled even when the amount is reduced by only about 3, the diameter of the absorbing liquid pipe 11 and the flow control valve 12 are controlled.
Can be selected so that the supply amount of the rare absorbing liquid to the high-temperature regenerator 1 is as described above.

[Second Embodiment] A second embodiment of the present invention will be described in detail with reference to FIGS. In addition, in order to facilitate understanding, in these drawings, the same reference numerals are given to portions having the same functions as the portions described in the drawings.

In the absorption refrigerator of the second embodiment, as shown in FIG. 5, an absorption liquid pipe 8 for sending a dilute absorption liquid from the absorber 5 to the high-temperature regenerator 1 has an absorption liquid having a partially identical diameter. Tube 8
A and 8B are branched, and a flow control valve 12 is provided in one of them, for example, the absorption liquid pipe 8A. The other piping configuration is the same as that of the absorption refrigerator of the first embodiment.

The opening degree of the flow control valve 12 provided in the absorbing liquid pipe 8A is controlled by the controller C, for example, as shown in FIGS.
Is controlled as any of the following.

That is, in the absorption refrigerator in which the controller C controls the flow control valve 12 as shown in FIG.
The lower the liquid level of the absorbing liquid heated in the high-temperature regenerator 1 is below the preset liquid level, the lower the flow control valve 1
2, the amount of the dilute absorbing liquid supplied to the high-temperature regenerator 1 through the absorbing liquid pipe 8A increases, so that the level of the absorbing liquid in the high-temperature regenerator 1 gradually increases. To return to the set level.

On the other hand, as the liquid level of the absorbing liquid heated in the high-temperature regenerator 1 is higher than a predetermined liquid level, the opening of the flow control valve 12 is reduced, whereby the absorbing liquid pipe 8A is closed. Since the amount of the diluted absorbing liquid supplied to the high-temperature regenerator 1 via the hot-water regenerating unit 1 decreases, the level of the absorbing liquid in the high-temperature regenerating unit 1 gradually decreases and returns to the set level.

In the absorption refrigerator in which the controller C controls the flow control valve 12 as shown in FIG. 7, the pressure in the high-temperature regenerator 1 detected by the pressure sensor S2 is lower than the preset pressure. The smaller the amount of the absorbing liquid discharged from the high-temperature regenerator 1 to the absorbing liquid pipe 9, the smaller the opening of the flow control valve 12 is, and the smaller the amount of the rare absorbing liquid supplied from the absorber 5 to the high-temperature regenerating apparatus 1 is. Therefore, it can be avoided that the liquid level of the absorbing liquid in the high-temperature regenerator 1 gradually rises.

On the other hand, as the pressure in the high-temperature regenerator 1 is higher than a predetermined pressure and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is larger, the opening of the flow control valve 12 is increased. Since the amount of the rare absorbing liquid supplied from the absorber 5 to the high-temperature regenerator 1 increases, it is possible to avoid that the level of the absorbing liquid in the high-temperature regenerator 1 gradually decreases.

In the absorption refrigerator in which the controller C controls the flow control valve 12 as shown in FIG. 8, the temperature of the absorption liquid in the high-temperature regenerator 1 detected by the temperature sensor S3 is set in advance. As the temperature is lower than the temperature and the amount of the absorbing liquid discharged from the high temperature regenerator 1 to the absorbing liquid pipe 9 is smaller, the flow control valve 1
2, the amount of the dilute absorbent supplied from the absorber 5 to the high-temperature regenerator 1 is reduced, so that also in this case, the level of the absorbent in the high-temperature regenerator 1 gradually rises. That can be avoided.

On the other hand, as the temperature in the high-temperature regenerator 1 is higher than the preset temperature and the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9 is larger, the opening of the flow control valve 12 is increased. Since the amount of the rare absorbing solution supplied from the absorber 5 to the high-temperature regenerator 1 is increased, it is possible to avoid that the level of the absorbing solution in the high-temperature regenerator 1 is gradually lowered.

The lower the temperature of the cooling water detected by the temperature sensor S4, the lower the regeneration pressure in the high-temperature regenerator 1, and the smaller the amount of the absorbent discharged from the high-temperature regenerator 1 to the absorbent pipe 9, the lower the flow rate. Since the opening of the control valve 12 is reduced to reduce the amount of the dilute absorbent supplied from the absorber 5 to the high-temperature regenerator 1, the level of the absorbent in the high-temperature regenerator 1 is gradually increased. Can be avoided.

On the other hand, as the temperature of the cooling water detected by the temperature sensor S4 is higher, the regeneration pressure in the high temperature regenerator 1 is higher, and the larger the amount of the absorbent discharged from the high temperature regenerator 1 to the absorbent pipe 9, the larger the flow rate. Since the opening degree of the control valve 12 is increased to increase the amount of the dilute absorbent supplied from the absorber 5 to the high-temperature regenerator 1, the level of the absorbent in the high-temperature regenerator 1 is gradually lowered. Can be avoided.

As described above, also in the absorption refrigerator of the second embodiment shown in FIG. 5, the level of the absorption liquid to be heated in the high-temperature regenerator 1 is controlled so as to always fall within a certain range. In addition, the diameter of the flow control valve 12 provided in the absorption liquid pipe 8A can be made smaller than that of the flow control valve provided in the absorption liquid pipe 8 and controlling the amount of the absorption liquid flowing into the high-temperature regenerator 1. It is a target.

In the absorption refrigerator of the second embodiment, the amount of the dilute absorption liquid supplied from the absorber 5 to the high-temperature regenerator 1 when the flow control valve 12 is fully closed is about 1/3. Since the liquid level of the absorbing liquid in the high-temperature regenerator 1 can be controlled even when the amount of the absorbing liquid decreases only, the absorbing liquid pipes 8A, 8A
The diameter of the pipe B and the diameter of the flow control valve 12 can be selected so that the supply amount of the diluted absorbent to the high-temperature regenerator 1 is as described above.

Since the present invention is not limited to the first and second embodiments, various modifications can be made without departing from the spirit of the appended claims.

For example, the opening of the flow control valve 12 is determined by the liquid level of the absorbing liquid in the high temperature regenerator 1 detected by the liquid level sensor S1, the pressure in the high temperature regenerator 1 detected by the pressure sensor S2,
The control may be performed based on an appropriate combination of the temperature of the absorption water in the high-temperature regenerator 1 detected by the temperature sensor S3 and the temperature of the cooling water detected by the temperature sensor S4, or based on all of them.

An inexpensive on-off valve is installed in place of the flow control valve 12, and its opening and closing are controlled by the controller C so that the level of the absorbing liquid heated by the high-temperature regenerator 1 is kept within a certain range. Can be controlled as follows.

The refrigerant vapor generated by the high-temperature regenerator 1 is directly sent to the evaporator 4 to be condensed, and hot water is taken out from the evaporator 4 and the refrigerant pipe 14 is connected to the pipe so that heating operation such as heating can be performed. It is also possible to do.

[0054]

As described above, according to the present invention, it is possible to control the level of the absorbing liquid to be heated by the high-temperature regenerator so as to always fall within a predetermined range. In addition, a valve provided in a conduit for returning the diluted absorbent discharged from the absorber to the high-temperature regenerator to the absorber, or a plurality of conduits through which the diluted absorbent supplied from the absorber to the high-temperature regenerator flows. , One of them
The diameter of the valve that is provided in this pipe and controls the amount of the dilute absorbent flowing into the high-temperature regenerator from the absorber is provided in one thick pipe from the absorber to the high-temperature regenerator. It is economical because the diameter of the valve that controls the amount of the rare absorbing liquid flowing in can be made smaller.

In particular, the amount of the dilute absorbent supplied from the absorber to the high-temperature regenerator is controlled by a valve provided in a conduit for returning the dilute absorbent discharged from the absorber to the high-temperature regenerator. According to the first aspect of the present invention, even if a valve provided additionally has a failure, it is possible to supply the rare absorbing liquid from the absorber to the high-temperature regenerator. There is no inconvenience of being unable to do so.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an apparatus configuration according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a first control method according to the first embodiment.

FIG. 3 is an explanatory diagram illustrating a second control method according to the first embodiment.

FIG. 4 is an explanatory diagram illustrating a third control method according to the first embodiment.

FIG. 5 is an explanatory diagram illustrating an apparatus configuration according to a second embodiment.

FIG. 6 is an explanatory diagram illustrating a first control method according to the second embodiment.

FIG. 7 is an explanatory diagram illustrating a second control method according to the second embodiment.

FIG. 8 is an explanatory diagram illustrating a third control method according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Condenser 4 Evaporator 5 Absorber 6 Low temperature heat exchanger 7 High temperature heat exchanger 8-11 Absorbing liquid pipe 12 Flow control valve 13 Absorbing liquid pump 14-16 Refrigerant pipe 17 Refrigerant pump 18 Cold water pipe 19 Cooling water pipe S1 Liquid level sensor S2 Pressure sensor S3 / S4 Temperature sensor C Controller

Claims (6)

[Claims] 1. A high-temperature regenerator that heats a rare absorbing liquid that has absorbed a large amount of a refrigerant to evaporate and separate the refrigerant, and obtains refrigerant vapor and an intermediate absorbing liquid from the rare absorbing liquid. A low-temperature regenerator that heats the intermediate absorption liquid to be produced with the refrigerant vapor generated by the high-temperature regenerator and further evaporates and separates the refrigerant to obtain a refrigerant vapor and a concentrated absorption liquid from the intermediate absorption liquid. Is supplied with the refrigerant liquid condensed by heating the refrigerant, and cools the refrigerant vapor generated and supplied by the low-temperature regenerator to obtain a refrigerant liquid; and a condenser supplied from the condenser and accumulated in the refrigerant liquid reservoir. The refrigerant liquid is sprayed onto the heat transfer tubes by the refrigerant pump, and the evaporator evaporates the refrigerant by removing heat from the fluid flowing in the heat transfer tubes, and the low-temperature regenerator Separates refrigerant vapor from water and absorbs it into the concentrated absorbent supplied An absorption refrigerator having an absorber for supplying a high-temperature regenerator with a diluted absorption liquid, and an absorption liquid return pipe having a valve between the absorber and the absorber from the absorber to the high-temperature regenerator And controlling the level of the absorbing liquid in the high-temperature regenerator by controlling the valve of the absorbing liquid return pipe. 2. A high-temperature regenerator that heats a rare absorbing liquid that has absorbed a large amount of a refrigerant to evaporate and separate the refrigerant, and obtains refrigerant vapor and an intermediate absorbing liquid from the rare absorbing liquid. A low-temperature regenerator that heats the intermediate absorption liquid to be produced with the refrigerant vapor generated by the high-temperature regenerator and further evaporates and separates the refrigerant to obtain a refrigerant vapor and a concentrated absorption liquid from the intermediate absorption liquid. Is supplied with the refrigerant liquid condensed by heating the refrigerant, and cools the refrigerant vapor generated and supplied by the low-temperature regenerator to obtain a refrigerant liquid; and a condenser supplied from the condenser and accumulated in the refrigerant liquid reservoir. The refrigerant liquid is sprayed onto the heat transfer tubes by the refrigerant pump, and the evaporator evaporates the refrigerant by removing heat from the fluid flowing in the heat transfer tubes, and the low-temperature regenerator Separates refrigerant vapor from water and absorbs it into the concentrated absorbent supplied In the absorption refrigerator having an absorber supplied to the high-temperature regenerator by being made into a diluted absorption liquid, a part or the entire length of the absorption liquid pipe from the absorber to the high-temperature regenerator is constituted by a plurality of absorption liquid pipes. A method of controlling a level of an absorption liquid in a high-temperature regenerator by providing a valve in one of the absorption liquid pipes and controlling the valve. 3. The method according to claim 1, wherein the degree of opening of the valve is controlled based on the level of the absorbing liquid in the high-temperature regenerator. 4. The method according to claim 1, wherein the opening of the valve is controlled based on the pressure in the high-temperature regenerator. 5. The method for controlling an absorption refrigerator according to claim 1, wherein the opening degree of the valve is controlled based on the temperature of the absorption liquid in the high-temperature regenerator. 6. The method according to claim 1, wherein the opening degree of the valve is controlled based on the temperature of the cooling water supplied to the absorber and the condenser.