JPH0552440A - Absorption type freezer - Google Patents

Abstract

PURPOSE:To provide an absorption type freezer which minimizes the influence exercised by outage during operation of the freezer by a method wherein it is accurately detected that a stop occurs owing to outage and a proper measure can be taken immediately after the occurrence of outage. CONSTITUTION:In an absorption freezer, a temperature switch 11 to detect one of the temperature of return liquid from a regenerator 3, the temperature of liquid fed to the regenerator 3, and the temperature of sprayed liquid to an absorber 1, or a pressure switch 12 detects one of a generator pressure, a vaporizer pressure, and an absorber pressure is provided. Alternatively both of the switches are provided. A control panel 10 or a microcomputer to judge the stop to be owing to outage during operation of a freezer from a detecting signal therefrom and command an operation mode during recovery of outage is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator,
The present invention relates to a water-lithium bromide-based absorption refrigerating machine, and particularly to an absorption refrigerating machine equipped with a power failure monitoring device suitable for detecting the presence or absence of a power failure during operation of the refrigerator.

[0002]

2. Description of the Related Art Conventionally, a power failure during the operation of an absorption refrigerating machine has been judged by detecting the cold water temperature after the power failure or by making an emergency stop of other equipment. All of these are indirect power outage detection methods, and could not detect the power outage immediately and accurately. Note that, for example, Japanese Patent Application Laid-Open No. 60-263057 can be cited as one related to this type.

[0003]

As described above, in the conventional absorption refrigerating machine, only indirect power failure monitoring is required, and immediately.
No consideration was given to directly monitoring for power outages. The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to immediately and directly monitor a power failure during operation of a refrigerator and automatically perform an appropriate measure after power recovery. Another object of the present invention is to provide an absorption refrigerating machine capable of performing the above. Also,
Another object of the present invention is to provide an absorption refrigerator that minimizes the influence of power failure during refrigerator operation by incorporating measures after power recovery in a control circuit.

[0004]

In order to achieve the above object, the structure of the first invention relating to the absorption refrigerator according to the present invention is as follows:
An evaporator that evaporates the refrigerant and cools cold water by its latent heat, an absorber that absorbs the refrigerant evaporated in the evaporator into an absorbent solution,
A condenser that cools the refrigerant evaporated in the regenerator with cooling water and condenses it, a regenerator that absorbs the refrigerant in the absorber and heats the diluted solution to increase the concentration again, a liquid supply to the regenerator, a regenerator Absorption consisting of a solution heat exchanger that exchanges heat between the liquids returned from, a refrigerant pump that sprays the refrigerant to the heat transfer tubes in the evaporator, and a solution pump that sends the solution to the regenerator and sprays it to the heat transfer tubes in the absorber. The refrigerator is equipped with a means for detecting at least one of the return liquid temperature from the regenerator, the liquid supply temperature to the regenerator, and the spray liquid temperature to the absorber, and the detected temperature is higher than a predetermined temperature. Therefore, a control means for determining a stop due to a power failure during operation of the refrigerator and instructing an operation mode at power recovery is provided.

In order to achieve the above object, the structure of the second invention relating to the absorption refrigerator of the present invention is based on the same premise of the first invention, and at least the regenerator pressure, the evaporator pressure, Equipped with a means for detecting any one of the absorber pressures, and a control means for judging the stop due to a power failure while the refrigerator is operating because the detected pressure is higher than a predetermined pressure and instructing the operation mode at power recovery. It is a thing.

Further, in order to achieve the above object, the structure of the third invention relating to the absorption refrigerator according to the present invention is the same as the first invention, and the temperature of the liquid returned from the regenerator,
The liquid supply temperature to the regenerator, means for detecting any temperature of the spray liquid temperature to the absorber, and means for detecting any pressure of the regenerator pressure, the evaporator pressure, the absorber pressure, The control means calculates the solution concentration from the detected temperature and the detected pressure, judges from the result the stop due to a power failure during the refrigerator operation, and commands the operation mode at the time of power recovery.

It should be noted that the above-mentioned object is to provide a temperature switch that operates by detecting the temperature of a specific portion of the absorption refrigerator, a pressure switch that operates by detecting the pressure of the specific portion, or both. This is achieved by incorporating a control circuit for exchanging signals with the control panel of the absorption chiller or the control system of the entire equipment. The same contents can also be achieved by combining a temperature detector, a pressure detector and a microcomputer.

[0008]

The function of the above technical means is as follows. In the water-lithium bromide absorption refrigerator, if the power fails during operation, the normal flow of the lithium bromide aqueous solution and the refrigerant cannot be maintained, and the balance of the refrigeration cycle is lost. Therefore, the temperature or pressure not detected during normal operation is
In case of an emergency stop due to a power failure, it is detected in the liquid supply line to the regenerator, the liquid return line from the regenerator, the liquid supply line to the absorber, the regenerator, the heat exchanger, the absorber, and the evaporator. By installing a temperature switch and a pressure switch in this part, it is possible to detect a power failure only on the refrigerator side, and immediately after power restoration, it is possible to automatically and optimally perform an optimal treatment. Further, the same effect can be achieved by combining a temperature detector, a pressure detector and a microcomputer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the present invention will be described below with reference to FIGS. [Embodiment 1] FIG. 1 is a system diagram showing a configuration of an absorption refrigerator according to an embodiment of the present invention. In FIG. 1, 1
Is an absorber that absorbs the refrigerant (water) into the absorbent (lithium bromide aqueous solution), 2 is an evaporator that evaporates the refrigerant, and cools the cold water that flows through the heat transfer tubes in the container by its latent heat. A reactor 5 is a high temperature regenerator, 4 is a condenser for cooling and condensing the refrigerant evaporated in both regenerators with cooling water flowing through a heat transfer tube in the vessel, 6 is a dilute solution to the regenerator, Solution heat exchanger for increasing internal efficiency by heat exchange of concentrated solution of No. 7, 7 is a refrigerant tank, 8 is a solution pump for circulating the solution and spraying it to the heat transfer tube in the absorber, 9 is heat transfer tube in the evaporator Is a control panel, and 11 is a temperature switch for power failure monitoring.

That is, the absorption refrigerator shown in FIG. 1 has an absorber 1, an evaporator 2, a low temperature regenerator 3, a condenser 4, a high temperature regenerator 5, a solution heat exchanger 6, a refrigerant tank 7, and a solution pump 8. ,
A measuring element 11 of a temperature switch 11 for monitoring a power failure, which includes a refrigerant pump 9 and a piping system operatively connecting these.
a is attached to the solution heat exchanger 6, and the temperature switch 11 is electrically connected to the control panel 10.

The solution having a low concentration due to the absorption of the refrigerant in the absorber 1 is sent to the low temperature regenerator 3 and the high temperature regenerator 5 via the solution heat exchanger 6 by the solution pump 8. The solution concentrated in both regenerators is sent again to the absorber 1 via the solution heat exchanger 6. The solution becomes high temperature when it is concentrated in both regenerators, but the solution temperature is also lowered because the solution concentration is diluted to a certain level or less during normal operation stop. However, in the case of a power failure, the solution pump 8 and the refrigerant pump 9 are stopped, so that the solution is not diluted and the refrigerator is stopped at high temperature and high concentration.

In the present embodiment, the temperature of the solution heat exchanger 6 is detected by the temperature switch 11 in the portion which becomes low in the normal operation stop and becomes high in the emergency stop due to the power failure, and the detection signal is sent to the control panel 10. send. Based on the detection signal, the control panel 10 determines that an emergency stop due to a power failure occurs at the same time as a power recovery from a high detection temperature state, and performs an appropriate operation mode such as a dilution operation, a warm-up operation, or a normal operation restart. The command signal of is output and displayed. As a result, it is possible to carry out the optimum treatment automatically or manually and minimize the influence of the refrigerator stop due to the power failure.

According to the embodiment shown in FIG. 1, it is possible to determine at the same time as the power recovery that the absorption refrigerating machine is stopped due to a power failure during operation. In addition, by incorporating the operation mode at power recovery into the automatic operation circuit, downtime due to power failure can be minimized, and crystal accidents accompanying power failure can be prevented,
It has the effect of being able to realize fully automatic operation in areas with poor power supply conditions.

[Embodiment 2] FIG. 2 is a system diagram showing a configuration of an absorption refrigerator according to another embodiment of the present invention. In the figure, those having the same reference numerals as those in FIG. In FIG. 2, a probe 11 a of the temperature switch 11 is a liquid supply line 14 to the absorber 1.
2 is an example in which the temperature of the liquid supply line to the absorber is detected and the temperature switch for power failure monitoring is operated.

Since the solution pump 8 is stopped at the time of power failure, the solution having a low temperature is not supplied to the solution heat exchanger 6. On the other hand, the high temperature solution in the high temperature regenerator 5 returns to the absorber due to the pressure difference between the high temperature regenerator 5 and the absorber 1. Therefore, the liquid supply line 14 to the absorber 1 has a higher temperature than that during operation during a power failure, and therefore the temperature switch 11 can detect the temperature and determine an abnormality due to a power failure. According to the embodiment of FIG.
The same effect as the embodiment of FIG. 1 can be obtained.

[Embodiment 3] FIG. 3 is a system diagram showing a configuration of an absorption refrigerator according to still another embodiment of the present invention. In the figure, those having the same reference numerals as those in FIG. In FIG. 3, 1
Reference numeral 2 is a pressure switch, and the probe 12a is attached to the absorber 1. The embodiment of FIG. 3 is an example in which the pressure of the absorber is detected by the pressure switch and power failure is monitored.

When a power failure occurs during operation of the refrigerator, the solution pump 8 and the refrigerant pump 9 are stopped. Therefore, although the liquid supply to the high temperature regenerator 5 is stopped, the refrigerant vapor in the high temperature regenerator 5 is absorbed by the absorber 1 due to the pressure difference between the high temperature regenerator 5 and the absorber 1.
Flow back to. Therefore, the pressure in the absorber 1 becomes higher than that in the normal stopped state. By detecting this with the pressure switch 12 and sending the detection signal to the control panel 10,
An abnormality due to a power failure can be judged instantly after the power is restored.
According to the embodiment of FIG. 3, the same effect as that of the embodiment of FIG. 1 can be obtained.

[Embodiment 4] FIG. 4 is a system diagram showing a configuration of an absorption refrigerator according to still another embodiment of the present invention. In the figure, those having the same reference numerals as those in FIG. In FIG. 4, 1
Reference numeral 3 is a microcomputer relating to the control means, the probe 11a relating to the temperature detecting means is provided in the solution line 15 of the low temperature regenerator 3, and the probe 12a relating to the pressure detecting means is provided in the high temperature regenerator 5. .. That is, in the embodiment of FIG. 4, the outlet solution temperature of the low temperature regenerator 3 and the pressure of the high temperature regenerator 5 are detected, and the detection signal is sent to the microcomputer 13, and the microcomputer 13
Is used to calculate the solution concentration in the high temperature regenerator 5 and monitor the power failure.

There is a certain relationship between the outlet solution temperature of the low temperature regenerator 3 and the pressure of the high temperature regenerator 5 and the solution concentration, which can be simulated by a microcomputer. Further, when the power is cut off, the solution pump 8 and the refrigerant pump 9 are also stopped, so that the solution in the high temperature regenerator 5 is not diluted and is in a stopped state. Since the solution is diluted to a certain level in a normal stop, it is possible to monitor the power failure by comparing this concentration. According to the embodiment of FIG. 4, the same effect as that of the embodiment of FIG. 1 can be obtained.

The above-mentioned embodiments are representative ones, and other examples can be adopted. For the power failure monitoring by the temperature switch, the temperature of the spray solution to the absorber may be detected in addition to the embodiment shown in FIGS. In addition, the power failure monitoring by the pressure switch may detect the pressure of the evaporator other than the embodiment of FIG. Further, the control means can be selected from a microcomputer and a control panel depending on the system.

[0021]

As described in detail above, according to the present invention, the power failure during the operation of the refrigerator is immediately and directly monitored,
It is possible to provide an absorption refrigerator that can automatically perform an appropriate procedure after power restoration. In addition, by incorporating the treatment after power recovery in the control circuit, it is possible to provide an absorption refrigerator that minimizes the effect of power failure during refrigerator operation.

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a system diagram showing a configuration of an absorption refrigerator according to another embodiment of the present invention.

FIG. 3 is a system diagram showing a configuration of an absorption refrigerator according to still another embodiment of the present invention.

FIG. 4 is a system diagram showing a configuration of an absorption refrigerator according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Absorber 2 Evaporator 3 Low temperature regenerator 4 Condenser 5 High temperature regenerator 6 Solution heat exchanger 8 Solution pump 9 Refrigerant pump 10 Control panel 11 Temperature switch 12 Pressure switch 13 Microcomputer

Claims (3)

[Claims] 1. An evaporator that evaporates a refrigerant and cools cold water by its latent heat, an absorber that absorbs the refrigerant evaporated in the evaporator into an absorbent solution, and a condenser that cools the refrigerant evaporated in a regenerator with cooling water to condense it. A regenerator that absorbs the refrigerant in the container and the absorber and heats the diluted solution to increase the concentration again, a solution heat exchanger that exchanges heat between the liquid supplied to the regenerator and the liquid returned from the regenerator, and the refrigerant. In an absorption chiller consisting of a refrigerant pump that sprays the heat transfer tubes in the evaporator and a solution pump that sends the solution to the regenerator and sprays the solution to the heat transfer tubes in the absorber, at least the temperature of the liquid returned from the regenerator and regeneration It is equipped with a means to detect either the temperature of the liquid supplied to the refrigerator or the temperature of the sprayed liquid to the absorber.Since the detected temperature is higher than the specified temperature, it is judged that the refrigerator is stopped due to a power failure and the power is restored. The operating mode at Absorption refrigerating machine characterized by comprising a control means. 2. An evaporator that evaporates a refrigerant and cools cold water by its latent heat, an absorber that absorbs the refrigerant evaporated in the evaporator into an absorbent solution, and a condenser that cools the refrigerant evaporated in the regenerator with cooling water to condense it. A regenerator that absorbs the refrigerant in the container and the absorber and heats the diluted solution to increase the concentration again, a solution heat exchanger that exchanges heat between the liquid supplied to the regenerator and the liquid returned from the regenerator, and the refrigerant. In an absorption chiller consisting of a refrigerant pump that sprays the heat transfer tubes in the evaporator, and a solution pump that sends the solution to the regenerator and sprays the solution to the heat transfer tubes in the absorber, at least the regenerator pressure, evaporator pressure, and absorption Equipped with a means for detecting any of the unit pressures, and a control means for judging the stop due to a power failure while the refrigerator is operating because the detected pressure is higher than the predetermined pressure and instructing the operation mode at power recovery. Characterized by Absorption chiller. 3. An evaporator that evaporates a refrigerant and cools cold water by its latent heat, an absorber that absorbs the refrigerant evaporated in the evaporator into an absorbent solution, and a condenser that cools the refrigerant evaporated in the regenerator with cooling water to condense it. A regenerator that absorbs the refrigerant in the container and the absorber and heats the diluted solution to increase the concentration again, a solution heat exchanger that exchanges heat between the liquid supplied to the regenerator and the liquid returned from the regenerator, and the refrigerant. In an absorption refrigerator that consists of a refrigerant pump that sprays the heat transfer tubes in the evaporator, a solution pump that sends the solution to the regenerator, and a solution pump that sprays the solution to the heat transfer tubes in the absorber, return liquid temperature from the regenerator to the regenerator It is equipped with a means for detecting the temperature of either the supply liquid of the liquid or the temperature of the liquid sprayed to the absorber, and a means for detecting the pressure of the regenerator pressure, the evaporator pressure, or the absorber pressure. Calculate the solution concentration from the detected pressure and Of determining a stop by a power failure in the refrigerator operation results, the absorption chiller being characterized in that a control means for instructing the operation mode at the time of power restoration.