JPH04136666A - Controller for absorbing freezer - Google Patents

Abstract

PURPOSE:To easily change over the operation of an absorbing liquid pump corresponding to heating volume of a generator and to control properly circulation volume of absorbing liquid by providing a heating volume controller to change over the heating volume of the generator corresponding to load and an absorbing liquid pump controller to operate the absorbing liquid pump under delta connecting system or star connecting system corresponding to the heating. volume of the generator. CONSTITUTION:At the time of operation of an absorbing freezer, for example, if freezing load is small, burning volume of a high temperature generator 1 is controlled by a burning controller 31 to be small. At this time, an absorbing liquid pump 20 is operated by an absorbing liquid pump controller 32 under star connecting system to decrease discharging volume of the absorbing liquid pump 20 is decreased corresponding to the heating volume. On the other hand, if the freezing load is large, the heating volume of the high temperature generator 1 is controlled by the burning controller 31 to be large, and the absorbing liquid pump 20 is operated by the absorbing liquid pump controller 32 under delta connecting system, so that the discharging volume of the absorbing liquid pump 20 is increased corresponding to the heating volume. Accordingly, without using an inverter controlling device of the like, circulating volume of absorbing liquid can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an absorption refrigerator, and particularly to a control device for an absorption refrigerator.

(b) Conventional technology For example, Japanese Patent Application Laid-Open No. 62-77567 discloses a heating amount adjusting device that controls the heating amount of the generator by the cold water outlet temperature of the evaporator, and a heating amount adjusting device that controls the amount of heating from the generator based on the temperature of the cold water outlet of the evaporator. An absorption refrigerator is disclosed that includes a temperature-controlled dilute solution flow rate regulator. In this absorption refrigerator, the control operation of the dilute solution flow rate adjustment device is a proportional operation, and the control operation of the heating amount adjustment device is a PID operation or a PI operation.

Here, in an absorption chiller equipped with a heating amount adjustment device that switches the heating amount of the generator, that is, the operation of the generator, between high combustion operation and low combustion operation depending on the cold water outlet temperature, the glaze pump (hereinafter referred to as absorption liquid pump When controlling the operation of the absorbent pump by the solution temperature of the generator, for example, a special absorbent pump for pole number conversion is used as the absorbent pump, and the pole number of the absorbent pump is changed by the pole number converter control device. A method of controlling the discharge amount of the absorption liquid pump, or a method of controlling the discharge amount of the absorption liquid pump by controlling the frequency of the electric power supplied to the absorption liquid pump using an inverter control device is used.

(c) Problems to be Solved by the Invention For example, when switching the generator between high combustion operation and low combustion operation depending on the load, that is, the cold water outlet temperature, and controlling the circulating amount of absorption liquid to an appropriate amount accordingly, the above-mentioned conventional When a pole number conversion control device or an inverter control device is used as shown in the above technique, a problem arises in that the control device becomes extremely complicated. In addition, special absorption liquid pump for pole number conversion,
Alternatively, if an inverter control device is used, the cost of the absorption refrigerator control device increases.

The present invention provides an inexpensive control device for an absorption refrigerator that can easily control an absorption liquid pump for high combustion operation and low combustion operation of a generator.

(d) Means for Solving the Problems In order to solve the above problems, the present invention provides a high temperature generator (1).
, condenser (4), evaporator (6), absorber (7), and an absorption liquid pump (20) that sends the absorption liquid from the absorber (7) to the high temperature generator <1), etc., are connected via piping for refrigeration. In the absorption refrigerator that forms the cycle, a high temperature generator (1
) Combustion controller (heating amount controller) (3
1) and an absorption liquid pump controller (32) that operates the absorption liquid pump (20) in delta connection operation and star connection operation according to the heating amount of the high temperature generator (1). It is something.

Additionally, there is a combustion controller (31) that switches the high temperature generator (1) between high combustion operation and low combustion operation according to the load, and an absorption liquid pump (20) and three-phase controller for high combustion operation and low combustion operation. The present invention provides a control device for an absorption refrigerating machine that includes an absorption liquid pump controller (32) that switches connection to an AC power source between delta connection and star connection.

(e) Effect When the absorption refrigerator is operating, for example, when the refrigeration load is small, the combustion amount of the high temperature generator (1) is controlled by 7 times less by the combustion controller (31), and the heating amount is small. Absorption liquid pump (20) by liquid pump controller (32)
is operated in star connection, and the discharge amount of the absorption liquid pump (20) can be reduced according to the above heating amount. Furthermore, when the refrigeration load is large, the amount of heating of the high temperature generator (1) is largely controlled by the combustion controller (31), and the absorption liquid pump (32) is controlled by the absorption liquid pump controller (32>).
20) is operated with a delta connection, and the discharge amount of the absorption liquid pump 20) can be increased in accordance with the above heating amount, and the circulation amount of the absorption liquid can be controlled to an appropriate amount without using an inverter control device or the like. becomes possible.

Furthermore, when the absorption chiller is operating, the high temperature generator (1) is switched between high combustion operation and low combustion operation by the combustion controller (31) according to the load, and also is switched between high combustion operation and low combustion operation. The connection between the absorption liquid pump (2o) and the three-phase AC power supply is switched to delta connection and star connection by the absorption liquid pump controller (32), and the above-mentioned high combustion operation and low combustion operation are performed without using an inverter control device or the like. In line with combustion operation,
It becomes possible to control the circulation amount of the absorption liquid to an appropriate amount.

Example) An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit diagram of an absorption refrigerator using water (H, O) as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorbent (solution).

In Figure 1, (1) is a high temperature generator equipped with a burner (IB), (2) is a separator, (3) is a low temperature generator, (4) is a separator, and (4) is a separator.
is the condenser, (5) is the condenser (4) and the low temperature generator (3)
(6) is the evaporator, (7) is the absorber, (
8) is a lower shell housing an absorber (7) and an evaporator (6);
(10) is a low-temperature heat exchanger, (11> is a high-temperature heat exchanger, and each has a dilute absorption liquid pipe (12) and a liquid lift pipe (13).
, intermediate absorption liquid piping (14), concentrated absorption liquid piping (15), and refrigerant pipe (16).

(17), and a refrigerant liquid flow down pipe (18). In addition, (20) is an absorption liquid pump installed in the dilute absorption liquid pipe (12), (21) is a refrigerant pipe that runs from the separator (2> to the lower shell (8)) and has an on-off valve (22); 2
2A) is a bypass pipe from the separator (2) to the low temperature generator (3) with a steam trap (22a), (23)
(25) is a refrigerant circulation pipe attached to the evaporator (6) and equipped with a refrigerant pump (24), and (25) is an evaporator heat exchanger (26).
), and (27) is a cooling water pipe connected to the absorber heat exchanger <28) and the condenser heat exchanger (29).

Here, the absorption liquid flows into the side pipe (22A) from the separator (2) to the low temperature generator (3) during dilution operation when the absorption refrigerator is stopped.

Further, (30) is a control panel for the absorption refrigerator, (31) is a heating amount controller (combustion controller), and (32) is an absorption liquid pump controller. (33) is a cold water outlet temperature detector installed in the cold/hot water pipe (25) on the outlet side of the evaporator (6), and the heating amount controller (31) receives a temperature signal from this temperature detector (33). input and set the burner (I) according to the cold water outlet temperature.
A high combustion signal or a low combustion signal is output to the burner (
The operation of IB) is controlled into high combustion operation and low combustion operation.

Also, when the heating amount controller 31) is outputting a low combustion signal to the burner (IB>), the absorption liquid pump controller (32)
), and when outputting a high combustion signal to the burner (IB), the absorbent pump controller (3
Similarly, a high combustion signal is output to 2).

Figure 2 is a schematic circuit diagram of the absorption liquid pump controller (32), where (34) is the first contact that is turned ON by the low combustion signal from the heating amount controller (31), and (35) is the heating amount controller. (
This is the second contact that is turned ON by the high combustion signal from 31). Also, (36) is for star operation! A separation switch (hereinafter referred to as a first electromagnetic switch), (37) is a normally open first electromagnetic switch main contact (hereinafter referred to as a first main contact).

(38) is the normally closed first electromagnetic switch auxiliary contact (hereinafter referred to as the first auxiliary contact), and when the first main contact (37) is turned on, the absorption liquid pump (20) is powered by, for example, a three-phase 20V power source. A star connection is made with the terminal, and a star connection operation (hereinafter referred to as star operation) is performed. (40) is the electromagnetic switch for delta operation (hereinafter referred to as the second electromagnetic switch), (41) is the normally open second electromagnetic switch main contact (hereinafter referred to as the second main contact), (
42) is a normally closed second electromagnetic switch auxiliary contact (hereinafter referred to as the second auxiliary contact), and when the second main contact (41) is turned on, the absorption liquid pump (20) is connected to the three-phase 200 port power supply and the delta The wires are connected and delta connection operation (hereinafter referred to as delta operation) is performed.

Hereinafter, the operation of the absorption refrigerator will be explained based on the time chart shown in FIG.

When the absorption chiller starts operating, if the chilled water outlet temperature is low, the heating amount controller (31) which receives the temperature signal from the temperature detector (33) outputs a low combustion signal to the burner (IB). , the burner (IB) performs a low combustion operation of, for example, 30%. Further, the heating amount controller (31) outputs a low combustion signal to the absorption liquid pump controller (32), and the first contact (34) is turned ON. Then, the first electromagnetic switch (36) is energized, the first main contact (37) is ONL, and the first auxiliary contact (38) is energized.
) turns off. When the first main contact is turned on, the rut voltage is applied, and the absorption liquid pump (20) starts star operation.

Then, the absorption liquid discharge amount of the absorption liquid pump (20>) becomes 30% of that of the delta operation.

Further, the refrigerant pump (24) is also operated, the absorption liquid and refrigerant are circulated in the same manner as in a conventional absorption refrigerator, and cold water is supplied from the evaporator <6> to the load.

Thereafter, the chilled water load increases, the chilled water outlet temperature rises, and when it reaches a predetermined temperature, the heating amount controller (31) that inputs the temperature signal from the temperature detector (33) operates, and the burner (IB)
) outputs a high combustion signal instead of a low combustion signal to the burner (
IB) performs 100% high combustion operation. Furthermore, the heating amount controller (31) outputs a high combustion signal instead of the low combustion signal to the absorption liquid pump controller (32), and the first contact (34)
is turned off, and the second contact (35) is turned on. Then, the first electromagnetic switch (36) is de-energized, the first main contact (37) is 0FFL, and the first auxiliary contact (38) is ON.
do. Then, the second electromagnetic switch (41) is energized, the second main contact (41) is ONL, and the second auxiliary contact (42) is OFF.
FF. Therefore, a voltage of 200 volts is applied to each coil of the absorption liquid pump (20), and a voltage of 200 volts is applied to each coil of the absorption liquid pump (20).
0) starts delta operation. Then, absorb liquid pump (2
The amount of absorption liquid discharged in case 0) is 100%.

Thereafter, when the chilled water load decreases and the chilled water outlet temperature falls to a predetermined temperature, the heating amount controller (31) operates and the burner (IB) performs low combustion operation, and the absorption liquid pump controller (32) operates. operates, and the absorption liquid pump (20) starts star operation. Thereafter, similarly, when the burner (IB) is performing high combustion operation, the absorption liquid pump (20) performs delta operation, the circulation amount of absorption liquid is controlled to 100%, and the burner (IB) is in low combustion operation. When you are driving,
The absorption liquid pump (20) performs star operation, and the circulation amount of the absorption liquid is controlled to approximately 30%. Also, when hot water is supplied to the absorption chiller, the on-off valve (22) opens and refrigerant vapor flows into the lower shell (8).
) is supplied with hot water from the evaporator (6). At this time as well, the heating amount of the high temperature generator (1) is controlled according to the hot water outlet temperature, as in the case of cold water supply, and the absorption liquid pump (20) is operated in delta operation or star operation accordingly.

According to the above embodiment, when the burner (IB) performs high combustion operation or low combustion operation depending on the refrigeration load or hot water load, the connection of the absorption liquid pump (20) can be switched to delta connection or star connection. The absorption liquid pump (2
0) is operated in delta or star mode, the circulation amount of the absorption liquid can be controlled to an appropriate amount without complicating the control device.

Furthermore, the cost of the control device for the absorption refrigerator can be reduced.

Note that the circuit of the absorption liquid pump controller (32) is not limited to the circuit shown in FIG. The operation of the absorption liquid bomb 20> can be controlled depending on the state of the burner (IB), for example, high combustion, medium combustion, or low combustion.

Further, in the above embodiment, an absorption refrigerator having a high temperature generator (1) equipped with a burner (IB) has been described, but for example, in an absorption refrigerator having a high temperature generator using high temperature and high pressure steam as a heating source, Also, by switching the connection between the absorption liquid pump (20) and the three-phase AC power supply between delta connection and star connection in accordance with the switching of the heating amount, and operating the absorption liquid pump (20) in delta operation or star operation. , it is possible to obtain the same effects as in the above embodiment.

(G) Effects of the Invention The present invention is a control device for an absorption refrigerator configured as described above, which includes a heating amount controller that switches the heating amount of the generator according to the load, and a heating amount controller that switches the heating amount of the generator according to the load. Since it is equipped with an absorption liquid pump controller that operates the absorption liquid pump in delta connection operation and star connection operation, the heating amount controller can be used to switch the heating amount of the generator, and a control device such as a conventional inverter control device can be used. The operation of the absorption liquid pump can be easily switched according to the heating amount of the generator using the absorption liquid pump controller to appropriately control the amount of absorption liquid circulation, and the cost of the absorption chiller control system can be reduced. It can be suppressed.

In addition, the combustion controller switches the generator between high combustion operation and low combustion operation according to the load, and the absorption liquid pump controller switches between the absorption liquid pump and the three-phase AC power supply for high combustion operation and low combustion operation. Since the connection is switched between a delta connection and a star connection, the capacity of the absorption liquid pump can be easily changed according to the magnitude of the combustion amount of the generator, and the circulation amount of the absorption liquid can be appropriately controlled.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of an absorption refrigerator showing an embodiment of the present invention, Fig. 2 is a schematic circuit diagram of the absorption liquid pump controller shown in Fig. 1, and Fig. 3 is a generator and absorption liquid diagram. It is a time chart explaining the operating state of a pump. (1)...High temperature generator, (4)...Condenser, (
6)...Evaporator, 7)...Absorber, (20)
... Absorption liquid pump, (31) ... Heating amount controller,
(32)...Absorption liquid pump controller.

Claims (1)

[Scope of Claims] 1. In an absorption refrigerator in which a generator, a condenser, an evaporator, an absorber, an absorption liquid pump for sending absorption liquid from the absorber to the generator, etc. are connected via piping to form a refrigeration cycle, It is characterized by being equipped with a heating amount controller that switches the heating amount of the generator according to the load, and an absorption liquid pump controller that operates the absorption liquid pump in delta connection operation and star connection operation according to the heating amount of the generator. A control device for an absorption chiller. 2. Absorption refrigeration, in which a refrigeration cycle is formed by connecting a generator, condenser, evaporator, absorber, and an absorption liquid pump that is supplied with power from a three-phase AC power source and sends absorption liquid from the absorber to the generator, etc. In the machine, the generator is equipped with a combustion controller that switches the generator between high combustion operation and low combustion operation according to the load, and a connection between the absorption liquid pump and the three-phase AC power source for the high combustion operation and low combustion operation. 1. A control device for an absorption refrigerating machine, comprising: an absorption liquid pump controller that switches between delta connection and star connection.