KR20080036505A - Absorption type water chiller and heater - Google Patents

Abstract

An absorption type water chiller/heater system is provided to recover a liquid level to a normal level in short time by operating an absorption liquid pump at high speed in the case of temporal liquid level decrease, thereby preventing alarm from being generated or operation of the system from being stopped erroneously by the temporal liquid level decrease. An absorption type water chiller/heater system includes a level detector(30) for detecting an absorption liquid surface of a high temperature regenerator(1), an absorption liquid pump(12) for sending weak absorption liquid of an absorber(6) to the high temperature regenerator, and a controller(33) for controlling the operation of the absorption liquid pump based on the detection result of the level detector. When the level detector detects a predetermined lowest level, the absorption liquid pump is driven at a high speed for a predetermined time for increasing an absorption liquid amount sent to the high temperature regenerator. The system alarms or stops when the level of the absorption liquid is lower than the low limit.

Description

Absorption cold / hot water machine {ABSORPTION TYPE WATER CHILLER AND HEATER}

1 is a schematic configuration diagram of an absorption type refrigerator according to the present invention.

2 is a control flowchart according to the first and second inventions of the present invention.

3 is a relationship between temperature and frequency for inverter control of an absorbing liquid pump according to the present invention.

4 is a control flowchart according to the third and fourth inventions of the present invention. (Second Embodiment, Third Embodiment)

Fig. 5 is a diagram showing a temperature rise detected by the temperature detection units according to the third and fourth inventions of the present invention. (Second embodiment, third embodiment)

<Explanation of symbols for main parts of the drawings>

1: high temperature regenerator

2: burner

3: low temperature regenerator

4: condenser

5: evaporator

6: absorber

7: low temperature heat exchanger

8: high temperature heat exchanger

9 to 11: Absorbing liquid tube

12: absorbent pump

13 to 15: refrigerant pipe

16: refrigerant pump

17: cold and hot water pipe

19: gas supply pipe to the gas burner (2)

20: fuel valve

21: outlet temperature detection unit of cold and hot water pipe

22: burner control unit

26, 27, 28: on-off valve

29: temperature detection unit for detecting the temperature of the absorbent liquid of the high temperature regenerator

30: Level detector for detecting liquid level of high temperature regenerator

31: exhaust gas temperature detection unit of the high temperature regenerator

32: inverter control unit

33: control unit

34: temperature detection unit of the coolant

[Document 1] Japanese Unexamined Patent Application Publication No. 3-28674

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption cold / hot water machine, and more particularly, to a technique in which an operation of an absorbent liquid pump for feeding a rare absorbent liquid of an absorber to a high temperature regenerator is controlled in accordance with an absorbent liquid level of a high temperature regenerator.

In the prior art, an absorbent liquid that responds to sudden load fluctuations, in particular, improves the drop in the coefficient of performance of the cooling partial load, and feeds the rare absorbent liquid of the absorber to the high temperature regenerator by means of the absorbent liquid level detector signal of the high temperature regenerator. Inverter control of the pump controls the flow rate of the absorbent solution to match the cooling load, thereby avoiding frequent on-off of the absorbent liquid pump due to rapid liquid level change in the high temperature regenerator, and stabilizing the operation of the absorber freezer. (For example, patent document 1).

Absorption chiller is an unusual condition in which the absorption liquid level of the high temperature regenerator is temporarily changed by the boiling state of the high temperature regenerator caused by sudden cooling load fluctuations during startup or operation, and the absorption liquid level detector lowers the lower limit of the absorption liquid level. It may be detected. Even when such temporary absorbing liquid level drop is detected, the warning of the co-heating state and the operation of the absorbing cold water heater are not immediately stopped. As described above, when the absorbing liquid pump is controlled by the inverter, the absorbing liquid level suddenly decreases when the cooling load is reduced. Although it rises up quickly, the absorbent liquid pump is operated at a low frequency, thereby avoiding a significant increase in the absorbent liquid surface and lowering the absorbent liquid surface to a predetermined value. In addition, when the cooling load increases, the absorbent liquid level is drastically lowered, but the absorbent liquid pump can be operated at a high frequency so that the absorbent liquid level can be raised to a predetermined value by avoiding a significant drop in the absorbent liquid surface.

When a sudden fluctuation of the absorbent liquid level occurs due to the singular state, it takes a considerable time of about 5 to 10 minutes to set the absorbent liquid surface to a predetermined value by inverter control of the absorbent liquid pump. There is a concern. For this reason, it is necessary to confirm early whether the abrupt fall of the absorbent liquid level is due to the above-described unusual state or if the absorbent liquid level has fallen below the lower limit due to the increase in the cooling load in normal normal operation. .

In view of the above, the present invention quickly detects whether the drop below the lower limit of the absorbent liquid level of the high temperature regenerator is temporary or a decrease in the normal state, and when it is judged that the temporary absorbent liquid level is lowered, the operation of the absorbent cold / hot water machine is continued. Otherwise, if it is determined that it is continuous, it warns that the state of co-heating has been reached and stops the operation of the absorption cold / hot water heater, thereby ensuring reliable co-heating control.

The absorption chiller of the first invention circulates the absorbent liquid and the refrigerant in a high temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by a pipe, and heats or cools the heat operating medium through the inside of the heat pipe disposed inside the evaporator to the air conditioning load. In an absorption type cold and hot water machine for supplying cooling or heating, a level detector for detecting an absorbing liquid surface of the high temperature regenerator, an absorbing liquid pump for feeding a rare absorbent liquid of the absorber to the high temperature regenerator, and the level detector And a control unit for controlling the operation of the absorbent liquid pump on the basis of the detection of the sensor, and when the level detector detects a predetermined lower limit level of the absorbent liquid surface, the absorbent liquid pump is operated at a high speed for feeding into the high temperature regenerator. Increases the amount of absorbed liquid, and the phase increases when the predetermined time is reached or when this predetermined time has elapsed. It is judged whether or not the level detector detects a predetermined lower limit level of the absorbent liquid level, and when the level detector detects a predetermined lower limit level of the absorbent liquid level, both the sound of the alarm and the operation stop of the absorption cold / hot water heater. Or one side is characterized.

The absorption type cold and hot water of the second invention circulates the absorbent liquid and the refrigerant in a high temperature regenerator, a condenser, an evaporator, an absorber, and the like connected by a pipe, and heats or cools the heat operating medium through the heat pipe disposed inside the evaporator to an air conditioning load. An absorption chiller that supplies cooling or heating to be supplied, comprising: a level detector for detecting an absorbing liquid surface of the high temperature regenerator; an absorbing liquid pump for feeding a rare absorbent liquid of the absorber to the high temperature regenerator; and detecting a temperature of the hot regenerator. And a temperature detector and a control unit of an inverter control for varying the rotation speed of the absorbent liquid pump by varying the frequency in a range from low frequency to high frequency, the level detector detecting a predetermined lower limit level of the absorbent liquid surface. The absorbent liquid pump at a predetermined high frequency for a predetermined time. It is determined whether or not the level detector detects the predetermined lower limit level of the absorbent liquid surface when the predetermined time is reached or the predetermined time has elapsed, and the level detector detects the predetermined lower limit level of the absorbent liquid surface. It is characterized in that both or one of the sound of the alarm and the stop operation of the absorption chiller.

The absorption type cold and hot water of the third invention circulates the absorbent liquid and the refrigerant in a high temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by a pipe, and heats or cools the heat operating medium through the inside of the heat transfer tube disposed inside the evaporator to the air conditioning load. An absorption chiller that supplies cooling or heating to be supplied, comprising: a level detector for detecting an absorbing liquid surface of the high temperature regenerator; an absorbing liquid pump for feeding a rare absorbent liquid of the absorber to the high temperature regenerator; and detecting a temperature of the hot regenerator. And a temperature detector and a control unit of an inverter control for varying the rotation speed of the absorbent liquid pump by varying the frequency in a range from low frequency to high frequency, the level detector detecting a predetermined lower limit level of the absorbent liquid surface. When the absorbent liquid pump over a predetermined time The temperature rise detected by the temperature detector is measured at the same time as operating at the wave number, and when the predetermined time is reached or the predetermined time has elapsed, the temperature rise is equal to or greater than a predetermined value, and the level detector is a predetermined value of the absorbing liquid surface. When the lower limit level is detected, both or one of the pronunciation of the alarm and the stop of operation of the absorption chiller are performed.

The absorption chiller of the fourth aspect of the present invention comprises an absorbent liquid pump for circulating the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, and an absorber connected by a pipe, and feeding the rare absorbent liquid of the absorber to the high temperature regenerator, and the absorbent liquid of the high temperature regenerator. And a control unit of inverter control for varying the frequency of the absorbent liquid pump in a range from low frequency to high frequency by temperature detection, and cooling or heating the medium through a heat pipe disposed inside the evaporator. In the absorption type cold and hot water machine for supplying air to the air conditioning load for cooling or heating, a level detector for detecting the absorbing liquid surface of the high temperature regenerator and a temperature detector for detecting the exhaust gas temperature of the high temperature regenerator are absorbed. The predetermined time when a predetermined lower limit level of the liquid level is detected; While operating the absorbent liquid pump at a predetermined high frequency, the temperature rise of the exhaust gas temperature detected by the temperature detector is measured, and when the predetermined time is reached or the predetermined time has elapsed, the temperature rise is greater than or equal to a predetermined value, In addition, when the level detector detects a predetermined lower limit level of the absorbing liquid surface, it is characterized in that both or one of the pronunciation of the alarm and the operation stop of the absorption chiller are performed.

Absorption cold and hot water of the present invention circulates the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by a pipe, and supplies a cooled or heated thermal operation medium to the air conditioning load through a heat pipe disposed inside the evaporator. In the absorption type cold and hot water machine for cooling or heating, the level detector for detecting the surface of the absorbent liquid of the high temperature regenerator, the absorbent pump for feeding the rare absorbent liquid of the absorber to the high temperature regenerator, and the detection of the level detector A control unit for controlling the operation of the absorbent liquid pump, and when the level detector detects a predetermined lower limit level of the absorbent liquid surface, the absorbent liquid pump is operated at a high speed for a predetermined time to increase the amount of absorbed liquid supplied to the high temperature regenerator; Detecting the level when the predetermined time is reached or when the predetermined time has elapsed. It is judged whether or not the group detects the predetermined lower limit level of the absorbent liquid surface, and when the level detector detects the predetermined lower limit level of the absorbent liquid surface, both or one of the alarm and the operation stop of the absorption chiller is performed. Examples of the invention are described below.

[First Embodiment]

Next, an embodiment of the absorption type cold and hot water machine of the present invention will be described. 1 is a schematic configuration diagram of an absorption type cold and hot water heater according to the present invention, FIG. 2 is a control flowchart according to the first and second inventions of the present invention, and FIG. 3 is a relationship diagram between temperature and frequency for inverter control of the absorption liquid pump.

An embodiment of the present invention will be described. Fig. 1 shows a schematic configuration diagram of an absorption cold / hot water group P using water as a refrigerant and lithium bromide (LiBr) as an absorption liquid. The high temperature regenerator 1 is configured to heat the rare solution in which the absorbent liquid and the refrigerant are mixed by the thermal power of the gas burner 2 that uses city gas as a fuel, and evaporate the refrigerant to separate the absorbent liquid and the refrigerant. 3 is a low temperature regenerator, 4 is a condenser, 5 is an evaporator, 6 is an absorber, 7 is a low temperature heat exchanger, 8 is a high temperature heat exchanger, 9-11 is an absorption liquid pipe, 12 is an absorption liquid pump of the mechanism which rotates a pump part by an electric motor. 13 to 15 is a refrigerant pipe, 16 is a refrigerant pump, 17 is a hot and cold water pipe, 18 is a cooling water pipe, 19 is a gas supply pipe to the gas burner (2), 20 is a fuel valve for controlling the gas supply amount to the gas burner (2), 21 is a temperature detector provided in the outlet pipe 17B so as to detect the temperature of the cold and hot water coming out of the outlet pipe 17B of the cold / hot water pipe 17, and 22 is a fuel valve 20 based on the temperature detection of the temperature detector 21. Burner control unit for controlling the degree of opening. Reference numeral 23 denotes a blower for supplying air to the gas burner 2 and 24 denotes an igniter for igniting the gas of the gas burner 2.

Reference numeral 25 is a second absorbent liquid pump, 26, 27 and 28 are on / off valves, 29 is a temperature detector for detecting the temperature of the absorbent liquid of the hot regenerator 1, 30 is a level detector for detecting the absorbent liquid surface of the hot regenerator 1, 31 The temperature detection unit for detecting the exhaust gas temperature of the high temperature regenerator 1, 32 is an inverter control unit for controlling the absorption liquid pump 12, 33 is a burner control unit 22 and the inverter control unit 32, including the absorption cold and hot water heater (P) ) Is a control unit for controlling the operation. The control unit 33 is provided with an MPU (microprocessor unit), a ROM for storing a program, a RAM for storing data such as temperature data, an input / output interface for communication means, and the like to operate the absorption cold / hot water machine P. To control.

The absorption cold / hot water machine P is operated to switch between a cooling operation for taking out cold water from the outlet pipe 17B of the cold / hot water pipe 17 and a heating operation for taking out hot water from the outlet pipe 17B. For this reason, in the cooling operation, the closing valves 26, 27, 28 are closed, the cooling water flows through the cooling water pipe 18, the gas burner 2 is ignited by the igniter 24, and the high temperature regenerator 1 When the absorbent liquid is heated, a refrigerant vapor vaporized and separated from the absorbent liquid and an intermediate absorbent liquid in which the concentration of the absorbent liquid is increased by separating the refrigerant vapor are obtained.

The high temperature refrigerant vapor generated in the high temperature regenerator 1 enters the low temperature regenerator 3 through the refrigerant pipe 13, and is generated in the high temperature regenerator 1 to absorb the high temperature heat exchanger 8 by the absorbent liquid pipe 10. The intermediate absorbent liquid that has entered the low temperature regenerator 2 is heated to condense heat and condensate into the condenser 4. In addition, the refrigerant heated in the low temperature regenerator 3 and evaporated and separated from the intermediate absorbent liquid enters the condenser 4, and condenses and liquefies by heat exchange with water flowing in the heat transfer pipe 18A from the cooling water pipe 18. Together with the condensation refrigerant supplied from 13, it enters the evaporator 5 through the refrigerant pipe 14.

The refrigerant liquid entering the evaporator 5 and stored in the refrigerant liquid storage portion at the bottom is dispersed by the refrigerant pump 16 on the heat transfer pipe 17A connected to the cold / hot water pipe 17, and supplied through the cold / hot water pipe 17. Heat exchanges with the water to evaporate, and cools the water flowing inside the heat transfer pipe 17A. The refrigerant evaporated in the evaporator 5 enters the absorber 6 and is heated in the low temperature regenerator 3 to evaporate and separate the refrigerant to further increase the concentration of the absorbent liquid, that is, the pump 25 from the absorbent liquid tube 11. Is supplied via the low temperature heat exchanger 7, and is absorbed by the concentrated absorbent liquid scattered from above. The absorbent liquid absorbing the refrigerant in the absorber 6 and having a lighter concentration, that is, the rare absorbent liquid, is operated by the absorbent liquid pump 12 to supply the high temperature regenerator 1 via the low temperature heat exchanger 7 and the high temperature heat exchanger 8. ) Is sent from the absorbent liquid tube (9).

When the absorption chiller is operated as described above, in the heat transfer pipe 17A piped inside the evaporator 5, the cold water cooled by the heat of vaporization of the refrigerant is passed through the outlet pipe 17B of the cold / hot water pipe 17. If circulation is supplied to an indoor unit (not shown), cooling operation can be performed.

On the other hand, in the heating operation, the open / close valves 26, 27, 28 are opened, the igniter 24 is ignited in the gas burner 2 without flowing the coolant through the coolant pipe 18, and the high temperature regenerator 1 When the rare absorbent liquid is heated at, the refrigerant evaporated from the rare absorbent liquid in the high temperature regenerator 1 is absorbed by the absorber 6 and the evaporator 5 from the middle of the refrigerant pipe 13 through the refrigerant pipe 13A having a small flow resistance. Heats through the heat transfer pipe 17A and the water supplied from the cold / hot water pipe 17, and condenses. The water flowing inside the heat transfer pipe 17A is mainly heated by the heat of condensation at this time.

The refrigerant condensed by heating in the evaporator 5 enters the absorber 6 through the opening / closing valve 28 by the refrigerant pump 16 from the refrigerant liquid storage portion at the bottom of the evaporator 5, and the high temperature regenerator ( The refrigerant is evaporated and separated in 1) and mixed with the absorbent liquid introduced through the open / close valve 27, and the low temperature heat exchanger 7 and the high temperature heat exchanger 8 are discharged from the absorbent liquid tube 9 by the operation of the absorbent liquid pump 12. Is sent to the high temperature regenerator (1).

The heating operation and the like are performed by circulating the hot water heated in the heat transfer pipe 17A inside the evaporator 5 to the indoor unit (not shown) through the outlet pipe 17B of the cold / hot water pipe 17.

The present invention includes a control unit 33 for controlling the operation of the absorbent liquid pump 12 on the basis of the detection of the level detector 30, and when the level detector 30 detects less than or equal to the lower limit of the absorbent liquid surface. The time absorbing liquid pump 12 is operated at a high speed to increase the amount of absorbing liquid fed into the high temperature regenerator 1, and the level detector 30 absorbs when this predetermined time is reached or when this predetermined time has elapsed. The control unit 33 determines whether or not the lower limit value of the liquid level is detected. Thereby, when the level detector 30 detects below the lower limit of the absorption liquid surface, the control part 33 controls so that both or one of the pronunciation of an alarm and the stop of operation of the absorption type cold water heater P may be performed.

The specific structure is described below. The control part 33 detects the detection output of the temperature detection part 29 which detects the absorption liquid temperature of the high temperature regenerator 1 installed as temperature detection of a high temperature regenerator, and the inlet temperature of the coolant which flows into the cooling water pipe 18. The detection output of the temperature detector 34 is input. In the cooling operation, based on the detection output of the temperature detection unit 29 and the detection output of the temperature detection unit 34, as shown in FIG. 3, the inlet temperature of the cooling water is, for example, from 22 ° C. to 32 ° C. FIG. Corresponding to each range determined for every 2 ° C. of, the frequency is continuous in the range of, for example, 28 Hz to 60 Hz when the temperature of the absorbent liquid of the high temperature regenerator 1 varies in the range from 90 ° C. to 160 ° C., for example. In this case, the higher the absorption liquid temperature of the high temperature regenerator 1 is, the higher the frequency signal output by the control unit 33 becomes by the input from the temperature detection unit 29. The frequency of the power output from the inverter control unit 32 to the motor of the absorbent liquid pump 12 becomes a high frequency, and the absorbent liquid pump 12 is in a high speed operation state, so that the discharge amount of the absorbent liquid pump 12 increases. In addition, as the temperature of the absorbent liquid of the high temperature regenerator 1 is lower, the frequency signal output by the controller 33 becomes a lower frequency signal by the input from the temperature detector 29, and the absorbent liquid pump ( The frequency of the electric power output to the electric motor of 12) becomes a low frequency, the absorption liquid pump 12 becomes a low speed operation state, and the discharge amount of the absorption liquid pump 12 reduces.

In the heating operation, the detection output of the temperature detection unit 29 which detects the temperature of the absorbent liquid of the high temperature regenerator 1 input to the control unit 33 is not based on the cooling water flowing in the cooling water pipe 18 as described above. As described above, as the absorption liquid temperature of the high temperature regenerator 1 is higher, the frequency signal output from the control unit 33 becomes a high frequency signal by the input from the temperature detection unit 29, and the inverter control unit 32 The frequency of the power output from the absorber pump 12 to the motor becomes a high frequency, the absorbent liquid pump 12 is in a high speed operation state, and the discharge amount of the absorbent liquid pump 12 increases. In addition, as the temperature of the absorbent liquid of the high temperature regenerator 1 is lower, the frequency signal output by the controller 33 becomes a lower frequency signal by the input from the temperature detector 29, and the absorbent liquid pump ( The frequency of the electric power output to the electric motor of 12) becomes a low frequency, the absorption liquid pump 12 becomes a low speed operation state, and the discharge amount of the absorption liquid pump 12 reduces.

Thus, the absorbent liquid pump 12 changes the frequency of the power output from the inverter control part 32 of the control part 33 to the absorbent liquid pump 12 at least according to the absorbent liquid temperature of the high temperature regenerator 1, and therefore, the absorbent liquid pump The inverter is controlled to change the rotation speed of 12, and the absorbent liquid surface of the high temperature regenerator 1 is maintained at an appropriate absorbent liquid level.

In addition, although the temperature detection of a high temperature regenerator is performed by the detection of the temperature detection part 29 which detects the absorbent liquid temperature of the high temperature regenerator 1, the temperature detector which detects the exhaust gas temperature of the high temperature regenerator 1 ( 31) may be configured by detection.

The level detector 30 is provided with three electrodes A, B, and C so as to detect the liquid level of the absorbent liquid of the high temperature regenerator 1, the electrode B is a common electrode, and the liquid level of the absorbent liquid is raised to reach the electrode A. At this time, the electrodes A and B are brought into a conductive state, and the control unit 33 operates to detect a high level (upper limit liquid level). If the liquid level of the absorbing liquid is lower than that of the electrode C, and the electrodes B and C are in a non-conductive state, the liquid level becomes a low level (lower limit liquid level or lower limit level) detection state, and the control unit 33 operates accordingly. For this reason, the absorbent liquid level is more than the electrode C, and the absorbed liquid amount is a normal state in the range below the electrode A, it is judged by the control part 33, and the absorbent liquid pump 12 is inverter-controlled as mentioned above.

Thus, the absorbent liquid level is above the electrode C and the absorbed liquid amount in the range below the electrode A is in a normal state. In this state, the absorbent liquid pump 12 is 28 kPa to 60 kPa as shown in FIG. The inverter is controlled in the range of. However, in this operating state, when the liquid level rise of the absorbent liquid occurs frequently in a short time due to any cause, the power frequency supplied to the absorbent liquid pump 12 is lowered. For example, when the power frequency supplied to the absorbent liquid pump 12 in the operating state by the inverter control is 40 kHz, the number of times that the absorbent liquid surface reaches the electrode A within a predetermined time (for example, 10 seconds) is controlled. 33), and when this reaches a predetermined number of times (e.g., three times), the absorbent liquid pump 12 is operated at 30 kHz from 40 kHz to a predetermined frequency (e.g., 10 kHz), or an inverter The control unit 33 controls the absorption liquid pump 12 to operate at 28 kHz, which is the lowest frequency of the control range. Thereby, the absorption type cold / hot water machine P can be stably operated even in an abnormal state in which the liquid level rise of the absorbent liquid occurs frequently in a short time.

As shown in FIG. 3, when the absorbent liquid pump 12 is inverter controlled in the range of 28 kPa to 60 kPa, when the liquid level of the absorbent liquid falls and falls below a predetermined lower limit level, that is, the electrode B and If the conduction of C is broken and becomes non-conductive, there is a concern that the high temperature regenerator 1 is co-heated because the absorbent liquid is in a low state. In this way, when the level detector 30 detects a predetermined lower limit level of the absorbing liquid surface, that is, when the electrodes B and C become non-conductive, it detects that the lower limit or lower limit of the absorbing liquid surface is lowered. The control unit 33 determines whether the predetermined low level is detected by a temporary change in the absorbed liquid surface.

One of these determination operations by the control unit 33 will be described based on FIG. In step S1, the liquid level of the absorbing liquid of the high temperature regenerator 1 is detected by the level detector 30. In step S2, it is determined whether the absorbing liquid surface is below the lower limit, that is, whether the electrodes B and C are non-conductive, and if the electrodes B and C are conductive, the process proceeds to step S6, but the electrodes B and C become non-conductive and are below the lower limit. Or, if it is detected that the lower limit value is lower, the process proceeds to step S3. In step S3, the absorbent liquid pump 12 is driven at high speed in the highest speed operation state of the operation range or near high speed operation state. In the embodiment, the inverter is operated for a predetermined time at a frequency of 60 Hz which is the maximum value controlled by the inverter. This predetermined time is 60 seconds in the embodiment, but may be any time in the range of 30 seconds to 60 seconds.

In step S4, when the liquid level rises for 60 seconds, the electrodes B and C become conductive, and the electrodes A and C become the conductive state, the flow advances to step S6 at that time. However, if the liquid level does not rise so that the electrodes A and C become conductive during this 60 seconds, the process proceeds to step S5 by 60 seconds (when it reaches 60 seconds or after 60 seconds). In step S5, it is determined whether the electrodes B and C are conducting, that is, whether or not the liquid level of the absorbing liquid of the high temperature regenerator 1 is equal to or lower than the lower limit level. By this determination, when the electrodes B and C are conducting, that is, the lower limit level or more, the process proceeds to step S6. Step S6 is a normal operation in which the operation of the absorption type cold water heater P is regular, and is output from the inverter control unit 32 of the control unit 33 to the absorption liquid pump 12 in accordance with the absorption liquid temperature of the high temperature regenerator 1 as described above. By changing the frequency of the power to be supplied, the inverter is controlled so that the rotation speed of the absorbent liquid pump 12 is changed, and the absorbent liquid surface of the high temperature regenerator 1 is maintained at an appropriate absorbent liquid level.

In step S5, when the electrodes B and C are not conductive, that is, the lower limit level is not reached, it is determined that the liquid level of the absorbing liquid of the high temperature regenerator 1 is insufficient, and the flow proceeds to step S7 to generate an abnormal alarm. do. The abnormality alarms include alarms due to pronunciation of a buzzer and light emission alarms that generate light such as lamps. In addition, in step S7, operation of the absorption type cold water heater P can also be stopped. Moreover, you may make it control the control part 33 to perform both or one of this warning and the operation stop of the absorption type cold water heater P.

In the above, after reaching step S6, it progresses to step 1 and each determination is made in the above steps. In this way, the operation from step 1 to step S6 is circulated.

Second Embodiment

In the present invention, when the liquid level of the absorbent liquid is lowered to a predetermined lower limit level, that is, when the conduction of the electrodes B and C is cut off and becomes non-conductive, the present invention determines whether this is due to a temporary change in the absorbed liquid level. Another means of the determination operation performed by the control unit 33 will be described based on FIGS. 4 and 5. In this case, the configuration and operation of the absorption chiller P are the same as those shown in Figs. In this case, the control part 33 inputs the detection output of the temperature detection part 29 which detects the temperature of the absorption liquid of the high temperature regenerator 1. As shown in FIG. 3, the absorbent liquid pump 12 is inverter controlled in the range of 28 kV to 60 kV. 4 is a control flowchart according to the present invention, and FIG. 5 is a diagram showing a temperature rise detected by the temperature detection unit according to the present invention.

In FIG. 4, the level detector 30 detects the liquid level of the absorbing liquid of the high temperature regenerator 1 in step S1. In step S2, it is determined whether the absorbing liquid surface is lower than the lower limit or lower than the lower limit, that is, whether the electrodes B and C are non-conductive, and if the electrodes B and C are conductive, the process proceeds to step S7, but the electrodes B and C are non-conductive. If the lower limit value or less is detected, the process proceeds to step S3. In step S3, the absorbent liquid pump 12 is driven at high speed. In the embodiment, the inverter is operated for a predetermined time at a frequency of 60 Hz which is the maximum value controlled by the inverter. This predetermined time is 60 seconds in the embodiment, but may be any time in the range of 30 seconds to 60 seconds.

In step S4, when the liquid level rises for 60 seconds, the electrodes B and C become conductive, and the electrodes A and C become the conductive state, the flow advances to step S7 at that time. However, if the liquid level does not rise so that the electrodes A and C become conductive during this 60 seconds, the process proceeds to step S5 by 60 seconds (when it reaches 60 seconds or after 60 seconds). In step S5, it is determined whether the electrodes B and C are conducting, that is, whether or not the liquid level of the absorbing liquid of the high temperature regenerator 1 is equal to or lower than the lower limit level. By this determination, when the electrodes B and C are conducting, that is, the lower limit level or more, the process proceeds to step S6. However, when the electrodes B and C are not conducting, that is, the lower limit level is not reached, the high temperature regenerator 1 It is determined that the liquid level of the absorbent liquid of?) Is insufficient, and the flow proceeds to step S8 to generate an abnormal alarm. The abnormality alarms include alarms due to pronunciation of a buzzer and light emission alarms that generate light such as lamps. In addition, in step S8, operation | movement of absorption chiller water heater P can also be stopped. Moreover, you may make it control the control part 33 to perform both or one of this warning and the operation stop of the absorption type cold water heater P.

In step S5, when electrodes B and C are conductive, ie, reach | attain the lower limit level, it progresses to step S6. In Step S6, as illustrated in FIG. 5, the detection output of the temperature detection unit 29 input to the control unit 33 determines whether the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is within a prescribed range. Do it. In the embodiment, it is judged whether or not the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is equal to or greater than a predetermined value (5 ° C.) in a predetermined time (15 seconds). The temperature of the left side of FIG. 5 is not limited to this.

In Step S6, the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is within a prescribed range, that is, the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is a predetermined value (5 ° C) for a predetermined time (15 seconds). If it does not reach, since the high temperature regenerator 1 is in the safety zone, the process proceeds to step S6. If the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is equal to or higher than the prescribed range, that is, the temperature rise of the absorbent liquid temperature of the high temperature regenerator 1 is equal to or higher than a predetermined value (5 ° C.) in a predetermined time (15 seconds). Since the high temperature regenerator 1 is in a danger zone, the flow advances to step S8 to generate an abnormal alarm. The abnormality alarms include alarms due to pronunciation of a buzzer and light emission alarms that generate light such as lamps. In addition, in step S8, operation of the absorption type cold water heater P can also be stopped. Moreover, you may make it control the control part 33 to perform both or one of this warning and the operation stop of the absorption type cold water heater P.

Step S7 is a normal operation in which the operation of the absorption type cold / hot water machine P is regular, and as described above, from the inverter control unit 32 of the control unit 33 to the absorption liquid pump 12 in accordance with the absorption liquid temperature of the high temperature regenerator 1. By changing the frequency of the output power, the inverter is controlled so that the rotation speed of the absorbent liquid pump 12 is changed, and the absorbent liquid surface of the high temperature regenerator 1 is maintained at an appropriate absorbent liquid level.

As described above, when the control unit 33 detects that the level detector 30 is lower than or lower than the lower limit of the absorbent liquid surface, the absorbent liquid pump 12 is operated at a predetermined high frequency for a predetermined time and at the same time a high temperature regenerator. The temperature rise of the absorbent liquid temperature of (1) is measured, and when the temperature rise is greater than or equal to the predetermined value when the predetermined time is reached or the predetermined time has elapsed, and the level detector 30 detects less than or equal to the lower limit of the absorbed liquid surface, an alarm is issued. And stop or stop operation of the absorption chiller. And when it reaches step S7, it progresses to step S1 and each judgment is performed in the above steps. In this way, the operation from step S1 to step S7 is cycled.

Third Embodiment

In the present invention, when the liquid level of the absorbent liquid is lowered to a predetermined lower limit level, that is, when the conduction of the electrodes B and C is cut off and becomes non-conductive, the control unit determines whether or not this is due to a temporary change in the absorbed liquid level. Another means of the determination operation to be performed by (33) will be described with reference to Figs. In this case, the configuration and operation of the absorption chiller P are the same as those shown in Figs. In this case, the control part 33 is the structure which the detection output of the temperature detection part 31 which detects the exhaust gas temperature of the high temperature regenerator 1 is input. As shown in FIG. 3, the absorbent liquid pump 12 is in the state of inverter control in the range of 28 kV to 60 kV. 4 is a control flowchart according to the present invention, and FIG. 5 is a diagram showing a temperature rise detected by the temperature detection unit according to the present invention.

In FIG. 4, the level detector 30 detects the liquid level of the absorbing liquid of the high temperature regenerator 1 in step S1. In step S2, it is determined whether the absorbing liquid surface is lower than the lower limit or lower than the lower limit, that is, whether the electrodes B and C are non-conductive. If the electrodes B and C are conductive, the process proceeds to step S7, but the electrodes B and C are non-conductive. When it comes to detecting below the lower limit or below the lower limit, it progresses to step S3. In step S3, the absorbent liquid pump 12 is driven at high speed. In the embodiment, the inverter is operated for a predetermined time at a frequency of 60 Hz which is the maximum value controlled by the inverter. This predetermined time is 60 seconds in the embodiment, but may be any time from 30 seconds to 60 seconds.

In step S4, when the liquid level rises for 60 seconds, the electrodes B and C become conductive, and the electrodes A and C become the conductive state, the flow advances to step S7 at that time. If the liquid level does not rise so that the electrodes A and C become conductive during the 60 seconds, the process proceeds to step S5 after 60 seconds (when it reaches 60 seconds or after 60 seconds). In step S5, it is determined whether the electrodes B and C are conducting, that is, whether or not the liquid level of the absorbing liquid of the high temperature regenerator 1 is equal to or lower than the lower limit level. By this determination, when the electrodes B and C are conducting, that is, the lower limit level or more, the process proceeds to step S6. However, when the electrodes B and C are not conducting, that is, the lower limit level is not reached, the high temperature regenerator 1 It is determined that the liquid level of the absorbent liquid of?) Is insufficient, and the flow proceeds to step S8 to generate an abnormal alarm. The abnormality alarms include alarms due to pronunciation of a buzzer and light emission alarms that generate light such as lamps. In addition, in step S8, operation | movement of absorption chiller water heater P can also be stopped. Moreover, you may make it control the control part 33 to perform both or one of this warning and the operation stop of the absorption type cold water heater P.

In step S5, when electrodes B and C are conductive, ie, reach | attain the lower limit level, it progresses to step S6. In Step S6, as shown in FIG. 5, the detection output of the temperature detection unit 31 input to the control unit 33 determines whether the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is within a prescribed range. Is done. In the embodiment, it is judged whether or not the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is equal to or greater than a predetermined value (5 ° C.) in a predetermined time (15 seconds). The temperature of the left side of FIG. 5 is not limited to this.

In step S6, the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is within a prescribed range, that is, the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is a predetermined value (15 seconds) in a predetermined time (15 seconds). If the temperature is not reached, the high temperature regenerator 1 is in the safety zone, and therefore the flow proceeds to step S6. If the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is equal to or higher than the prescribed range, that is, the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is higher than the predetermined value (5 ° C.) in a predetermined time (15 seconds). In this case, since the high temperature regenerator 1 is in a danger zone, the flow proceeds to step S8 to generate an abnormal alarm. The abnormality alarms include alarms due to pronunciation of a buzzer and light emission alarms that generate light such as lamps. In addition, in step S8, operation | movement of absorption chiller water heater P can also be stopped. Moreover, you may make it control the control part 33 to perform both or one of this warning and the operation stop of the absorption type cold water heater P.

Step S7 is a normal operation in which the operation of the absorption type cold / hot water machine P is regular, and as described above, from the inverter control unit 32 of the control unit 33 to the absorption liquid pump 12 in accordance with the absorption liquid temperature of the high temperature regenerator 1. By changing the frequency of the output power, the inverter is controlled so that the rotation speed of the absorbent liquid pump 12 is changed, and the absorbent liquid surface of the high temperature regenerator 1 is maintained at an appropriate absorbent liquid level.

As described above, when the liquid level of the absorbing liquid is reduced by the controller 33 to reach a predetermined lower limit level, that is, when the electrodes B and C of the level detector 30 are in a non-conductive state, they are over a predetermined time. While operating the absorbent liquid pump 12 at a predetermined high frequency, the temperature rise of the exhaust gas temperature of the high temperature regenerator 1 is measured, and when the predetermined time is reached or the predetermined time has elapsed, the temperature rise is not less than the predetermined value and the level is increased. When the detector 30 detects below the lower limit of the absorbing liquid level, both or one of the alarm and the operation stop of the absorption chiller is performed. And after reaching step S7, it progresses to step S1 and each judgment is performed in the above steps. In this way, the operation from step S1 to step S7 is circulated.

In the second and third embodiments, step S6 is performed first and step S5 is performed afterwards, so that the order of step S5 and step S6 can be reversed.

In addition, the level detector 30 detects the upper limit value and the lower limit value of the absorbing liquid surface. In the above description, three electrodes A, B, and C having different lengths are provided. However, the level detector 30 is not limited thereto. (30) comprises four electrodes D, E, F and G of different lengths, detects the upper limit of the absorbing liquid surface by the conduction of the electrodes D and E, detects the lower limit by the conduction of only the electrodes F and G, The intermediate liquid level can be detected by the electrodes E and F, and the inverter liquid can be configured to control the absorbent liquid pump 12 in the same manner as described above between the upper limit value and the lower limit value.

The present invention can be variously modified in piping, control mechanisms, and the like of the absorption chiller, and is applicable to various aspects without being limited to the above-described aspects and without departing from the technical scope of the present invention.

According to a first aspect of the present invention, the absorbing liquid level of the high temperature regenerator changes temporarily temporarily due to the boiling state of the high temperature regenerator, which occurs during the start of the absorption chiller or the change in the refrigeration load during operation, and the like. When the level is detected, the high-speed operation of this absorbing liquid pump can speed up the return to the normal level of the liquid level, so that a quick and reliable determination is made without waiting for a long time until this temporary liquid level drop is naturally restored. It can be done. Therefore, it is possible to prevent the pronunciation of the alarm due to the temporary liquid level drop and the malfunction of the operation stop of the absorption cold / hot water dispenser, and the like. In the normal operation, when the absorption liquid level becomes lower than or equal to the lower limit, the alarm or the operation of the absorption cold / hot water dispenser is stopped. By the control, co-heating of the high temperature regenerator can be prevented in advance.

Since the second invention is an inverter control in which the rotation speed of the absorbent liquid pump varies from a low frequency to a high frequency, the absorbent liquid pump is full at a predetermined high frequency over a predetermined time when the level detector detects a predetermined lower limit level of the absorbent liquid surface. By operating, the return to the normal level of the liquid level can be accelerated, so that a quick and reliable determination can be made without waiting for a long time until this temporary liquid level drop is naturally restored. Therefore, it is possible to prevent the pronunciation of the alarm due to the temporary liquid level drop and the malfunction of the operation stop of the absorption cold / hot water dispenser. When the absorption liquid level actually falls below the lower limit, the high temperature regenerator is controlled by the alarm or the operation of stopping the absorption cold / hot water dispenser. The co-heating of can be prevented in advance.

In the third invention, in addition to the second invention, the temperature rise of the absorbent liquid of the high temperature regenerator is abnormal when the temperature rise of the absorbent liquid of the high temperature regenerator is higher than or equal to the predetermined value. When the level detector detects the predetermined lower limit level of the absorbing liquid level, the level is in the state of co-heating due to the lowering of the liquid level. At that time, the warning is informed that the kind of alarm is air-heating by stopping the operation of the co-heating alarm or the absorption chiller. In addition, it becomes possible to reliably protect.

In the fourth invention, in addition to the second invention, the temperature rise of the high temperature regenerator is abnormal when the temperature rise of the exhaust gas temperature of the high temperature regenerator is equal to or greater than the predetermined value. When the level detector detects a predetermined lower limit level of the absorbent liquid level, it is in the state of co-heating due to the lowering of the liquid level. At that time, the type of alarm is informed that the type of alarm is air-heated by stopping the operation of the co-heating alarm or the absorption chiller. Inspection and protection can be performed reliably.

Claims (4)

Absorption type that circulates the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, and an absorber connected by a pipe, and supplies cooling or heating to the air conditioning load by supplying a cooled or heated thermal operation medium to the air conditioning load through the heat pipe disposed inside the evaporator. In a cold / hot water machine, the level detector for detecting the absorbent liquid surface of the high temperature regenerator, the absorbent pump for feeding the rare absorbent liquid of the absorber to the high temperature regenerator, and the operation of the absorbent liquid pump are controlled based on the detection of the level detector. And a control unit configured to operate the absorbent liquid pump at a high speed for a predetermined time when the level detector detects a predetermined lower limit level of the absorbent liquid surface to increase the amount of absorbed liquid supplied to the high temperature regenerator, and to reach the predetermined time or When the predetermined time has elapsed, the level detector determines a predetermined lower limit of the absorbing liquid surface. Determined whether the detection level, wherein the level detector is an absorption cold or hot water generating machine according to claim for performing one or both of the operation stop of the alarm when detecting a predetermined lower limit level of the absorption liquid surface and pronunciation absorption cold or hot water generating machine. Absorption type that circulates the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, and an absorber connected by a pipe, and supplies cooling or heating to the air conditioning load by supplying a cooled or heated thermal operation medium to the air conditioning load through the heat pipe disposed inside the evaporator. In a cold and hot water machine, a level detector for detecting the surface of the absorbent liquid of the hot regenerator, an absorbent pump for feeding the rare absorbent liquid of the absorber to the high temperature regenerator, a temperature detector for detecting the temperature of the high temperature regenerator, and the temperature detector A control unit of an inverter control which detects and varies the frequency of the absorbent liquid pump in a range from a low frequency to a high frequency, and when the level detector detects a predetermined lower limit level of the absorbent liquid surface, Operate for a predetermined time at high frequency and reach this predetermined time Determines whether or not the level detector detects a predetermined lower limit level of the absorbent liquid surface when the predetermined time elapses, and when the level detector detects a predetermined lower limit level of the absorbent liquid surface, the sound of the alarm and the absorption cold / hot water machine Absorption chiller, characterized in that to perform both or one of the stop operation. Absorption type that circulates the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, and an absorber connected by a pipe, and supplies cooling or heating to the air conditioning load by supplying a cooled or heated thermal operation medium to the air conditioning load through the heat pipe disposed inside the evaporator. In a cold and hot water machine, a level detector for detecting the surface of the absorbent liquid of the hot regenerator, an absorbent pump for feeding the rare absorbent liquid of the absorber to the high temperature regenerator, a temperature detector for detecting the temperature of the high temperature regenerator, and the temperature detector A control unit of an inverter control which detects and varies a frequency in a range from a low frequency to a high frequency so as to vary the rotation speed of the absorbent liquid pump, and when the level detector detects a predetermined lower limit level of the absorbent liquid surface, The absorption liquid pump is operated at a predetermined high frequency while The temperature rise detected by the temperature detector is measured, and when the predetermined time is reached or the predetermined time has elapsed, the temperature rise is greater than or equal to a predetermined value, and the level detector is detecting a predetermined lower limit level of the absorbing liquid surface. Absorption chiller characterized in that both or one of the sound of the alarm and stop operation of the absorption chiller. An absorbent pump for circulating the absorbent liquid and the refrigerant to a high temperature regenerator, a condenser, an evaporator, and an absorber connected by a pipe and feeding the rare absorbent liquid of the absorber to the high temperature regenerator; And a control unit for inverter control to vary the frequency of the absorbent liquid pump in a range of up to a temperature, and to supply air conditioning loads to the air conditioning load by supplying a cooled or heated thermal operation medium through a heat pipe disposed inside the evaporator. An absorption cold / hot water heater for heating, comprising: a level detector for detecting the absorbing liquid surface of the hot regenerator; and a temperature detector for detecting the exhaust gas temperature of the high temperature regenerator; wherein the level detector detects a predetermined lower limit level of the absorbing liquid surface. When the absorbent liquid pump over the predetermined time Measure the temperature rise of the exhaust gas temperature detected by the temperature detector while operating at a high frequency, and the temperature rise is equal to or greater than a predetermined value when the predetermined time is reached or the predetermined time has elapsed, and the level detector An absorbent cold water heater, characterized in that both or one of the sound of the alarm and the operation stop of the absorbent cold water heater are performed when the predetermined lower limit level of the absorbent liquid level is detected.

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