JPS61280354A - Absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applicable to absorption refrigerators, absorption heat pumps, absorption chiller/heaters, etc. (hereinafter referred to as such types) equipped with a device for adjusting the flow rate of absorption liquid by 1°. (absorption refrigerator).

(B) Conventional technology The conventional technology for this type of absorption chiller involves controlling the rotational speed of an absorbent pump using a physical quantity that changes in response to a change in load, such as the chilled water temperature, as an operating signal. fMil! : A device that adjusts the
664) and those that adjust the opening degree of the absorption liquid flow rate control valve (for example, Japanese Patent Publication No. 55-27267, Japanese Patent Publication No. 55-27267,
7-27375).

Hj Problems to be Solved by the Invention In the above-mentioned conventional absorption chillers of this type (hereinafter referred to as conventional machines), the load changes gradually and the corresponding physical quantity [for example, chilled water temperature] changes. If the change is gradual and the flow rate of the absorbent is to be increased or decreased little by little (when the load changes gradually due to temperature changes from morning to evening, and the flow rate of the absorbent is changed accordingly), select the appropriate absorbent. Circulation control is possible, but this is not the case [for example, the load changes suddenly due to an increase or decrease in the number of rooms required for cooling, and the number of pumps that supply cold water to each room increases or decreases, causing problems compared to conventional models. In cases where the chilled water flow rate increases or decreases significantly and the chilled water temperature changes suddenly], the internal conditions of conventional machines, such as the pressure and temperature inside the generator, do not suddenly change immediately after a sudden change in load, so absorption liquid flow rate control is necessary. This is likely to be done beyond the range of the absorption liquid flow rate that should actually be adjusted. For this reason, in conventional machines, the circulation amount of absorption liquid is not always properly controlled at the beginning of a sudden change in load, and the load may cause problems such as an excessive rise or fall of the absorption liquid level in the generator or cavitation of the absorption liquid pump. The problem was that it was easy to cause immediately after a sudden change, and that the protective device was often activated and the operation was stopped.

In view of these problems, the present invention is capable of compensating the absorption liquid flow rate control immediately after a sudden change in load, and is capable of safely continuing operation by preventing the activation of a protection device immediately after a sudden change in load. The purpose is to provide a seed absorption refrigerator.

B) Means for Solving the Problems The present invention, as a means for solving the above-mentioned problems, provides a control device that adjusts the opening degree of the absorption liquid flow rate control valve or the discharge amount of the absorption liquid pump. This type of absorption chiller is equipped with an adjustment device that corrects the opening degree of the flow control valve or the discharge amount of the absorption liquid pump while detecting physical quantities (absorption liquid level and pressure in the generator, etc.) that change due to the influence of the absorption liquid flow rate. The structure is designed to prepare for the future.

(E) Function In the absorption refrigerator of the present invention, the function is that, for example, when the load suddenly changes and the discharge amount of the absorption liquid pump is greatly increased or decreased by the control device, the absorption liquid in the generator is Even if an imbalance occurs in the amount of absorption liquid in and out of the generator, it is possible to substantially balance the amount of absorption liquid in and out of the generator by compensating for the degree of increase/decrease in the discharge amount of the pump using the adjustment device.

Therefore, in the absorption refrigerating machine of the present invention, it is possible to prevent the absorption liquid level in the generator from rising or falling excessively, and operation can be continued safely.

(v) Embodiment The drawing is a schematic configuration explanatory diagram showing one embodiment of this type of absorption refrigerator according to the present invention, +11 is a high temperature generator, (2
) is a low temperature generator, (3) is a condenser, (4) is an evaporator, (
5) is an absorber, (6) and (7) are low-temperature and high-temperature solution heat exchangers, ゛(P8) is a pump for refrigerant liquid, and (P,) is a pump for absorbent liquid with variable discharge rate. Pipe (8), (9) through which the refrigerant flows, pipe (01) through which the refrigerant liquid flows, pipe (1) through which the refrigerant liquid flows, pipe (1) through which the absorption liquid flows, pipe (1) through which the absorption liquid flows, The pipe (16L tJη, connected by the α frame constitutes a circulation path for the refrigerant [water] and the absorption liquid [lithium bromide aqueous solution].Al connects the pipe (8) and the absorber (5). This is a refrigerant vapor pipe line with a heating/cooling switching valve (V,), and the pipe line is an absorbing liquid pipe line with a heating/cooling switching valve (V,) that connects the pipe Q51 and the lower part of the absorber (5).

(21) is the combustion heating chamber of the high temperature generator (1), (22, (
221... is the pipe through which the combustion gas flows, (c) is the heater of the low temperature generator (2), (Foundation), C! Each chant is a condenser (
3) is the cooler for the absorber (5), and the bottom is the evaporator (4)
It is a heat exchanger. (2'?) (C) is a heat exchanger (E)
A pipe line through which cold water or hot water flows, which is connected to a heat exchange unit (not shown) on the load side. It is a flowing conduit. Further, 04 is a conduit for supplying fuel to the combustion heating chamber 01), and this conduit is equipped with a fuel control valve (■,).

(Sty) is a temperature detector installed in the pipe line (C), this, the first regulator (C+), and the absorption liquid pump with variable discharge amount (Sty).
PA) and a control device for controlling the absorption liquid flow rate with respect to the load is constructed in the same manner as the conventional one. Further, this control device may use a flow control valve (■,) instead of the pump (P,).

Note that the temperature detector (Stw), the 1st v/4 node, and the fuel control valve (■,) constitute a heating amount control device for the load.

Further, (Sta) is a detector that senses the temperature of the absorption liquid in the high temperature generator fll, (St) is a detector that senses the wall temperature of the high temperature generator (1), and (Str) is a detector that senses the temperature of the wall of the high temperature generator (1). 1)
A detector for sensing the temperature of the refrigerant vapor in the high temperature generator (1), (5tp) is a detector for sensing the internal pressure of the high temperature generator (1), (81)
is a test signal that senses the absorption liquid level in the high temperature generator (1). and also a second regulator (
C8) and absorption liquid pump (P,) or flow control valve (
V, ) constitute an absorption liquid flow rate adjustment device. The absorption liquid flow rate adjustment device corrects the absorption liquid flow rate adjusted by the control device.

(■,) constitute a heating amount adjusting device, which corrects the amount of fuel adjusted by the heating amount controlling device.

Next, an example of the operation of the absorption refrigerating machine configured as described above (hereinafter referred to as the present machine) will be explained while comparing it with a conventional absorption refrigerating machine of this type.

Now, for example, when the number of rooms being cooled is reduced from 10 (full load) to 2 (20% load), high temperature is generated from the absorber (5) by the absorption liquid flow rate control device and heating amount control device. The absorption liquid flow rate to the vessel (1) and the heating amount of the high temperature generator fl) are sharply reduced to 115. In other words, this machine, like the conventional absorption refrigerator of this type [hereinafter referred to as the conventional machine],
The discharge amount of the absorption liquid pump (P,) or the opening degree of the flow control valve (V,) and the fuel control valve (■,) are controlled by the signal from the temperature sensor (Stvr) via the first regulator (CI). The opening is reduced to electric.

However, at this time, the temperature and internal pressure of the high-temperature generator (1) do not drop quickly due to the heat retained in the high-temperature generator (1), and the pressure difference between the high-temperature generator fil and the low-temperature generator (2) does not suddenly change. Since the amount of absorption liquid flowing out from (1) does not immediately decrease, the amount of absorption liquid flowing in and out of this generator becomes temporarily unbalanced. Therefore, in conventional machines, the high temperature generator m
The liquid level inside the reactor becomes too low temporarily, resulting in a state close to dry firing, and a protection device (not shown) is activated to cut off the heating of the high temperature generator (1), stopping operation. On the other hand,
In this machine, the signal from the detector (S+) is used to control the second regulator (
C3), the discharge amount of the absorption liquid pump (P,) or the opening degree of the flow rate control valve (■,) is increased and adjusted, so that the liquid level of the high temperature generator (1) temporarily decreases when the load suddenly decreases. This prevents excessive deterioration. That is, the adjustment device corrects an excessive reduction in the flow rate of the absorption liquid caused by the control device. Therefore, this machine can safely continue its operation even when the load suddenly decreases. In addition, if the liquid level in the high-temperature generator (1) temporarily drops when the load suddenly decreases, and it starts to run dry, the temperature and vapor pressure of the absorbing liquid and refrigerant in this generator, or the Since the temperature of the chamber wall etc. will rise excessively, the detector (Sta), instead of the signal of the detector (Sl),
The absorption liquid flow rate may be corrected using any one of the signals (St), (8tp), and (Str).

On the other hand, when the load suddenly increases, in conventional machines, protective devices are installed to prevent a temporary excessive rise in the liquid level in the high temperature generator il+ or a temporary excessive drop in the liquid level in the absorber (5). will be activated and the driving will be stopped,
In this machine, the adjustment device compensates for an excessive increase in the flow rate of absorption liquid from the absorber (5) to the high temperature generator (1), so that the amount of liquid in and out of the high temperature generator (1) is almost balanced. The operation can be continued safely in order to adjust the amount of liquid circulation.

In addition, in this machine, when the load suddenly changes, the high temperature generator (1
) If the change in physical quantities such as pressure, temperature or liquid level in ) becomes temporarily excessive, the opening degree of the fuel control valve (■, ) is corrected by the heating amount adjustment device K, and the high temperature generator (1) The amount of heating is compensated so that there is no temporary excess or deficiency.

(G) Effects of the Invention As described above, in this type of absorption refrigerator of the present invention, when the load suddenly changes, the pressure and temperature inside the generator change due to the influence of the absorption liquid flow rate adjusted by the conventional control device. Even if changes in physical quantities such as liquid level become temporarily excessive, the absorption liquid flow rate adjustment device corrects the amount of absorption liquid sent to the generator, so that the amount of liquid in and out of the generator is balanced. Since the circulation amount of the absorption liquid is adjusted, this has the practical effect of safely continuing the operation.

[Brief explanation of the drawing]

The drawing is a schematic structural diagram showing an embodiment of this type of absorption refrigerator according to the present invention. (1)...High temperature generator, (2)...Low temperature generator,
(3)... Condenser, (4)... Evaporator, (5
)...Absorber, (P,)...Absorbing liquid pump,
(CI), (C Y), (Cs)・”1st, 2nd, 3rd
Controller, (Stw)...Temperature detector, (Si),
(Sta), (Sip), (Sir), (Sl)...
・Detector, (■,)...Flow control valve, (V,)・
...Fuel control valve.

Claims (4)

[Claims] (1) In an absorption refrigerator equipped with a control device that adjusts the opening degree of a flow rate control valve provided in the absorption liquid flow path between the absorber and the generator or the discharge amount of the absorption liquid pump, the control device It is characterized by being equipped with an absorption liquid flow rate adjustment device that corrects the opening degree of the flow rate control valve or the discharge amount of the absorption liquid pump while detecting a physical quantity that changes depending on the flow rate of the absorption liquid to be adjusted. Absorption refrigerator. (2) The absorption refrigerator according to claim 1, wherein the physical quantity is an absorption liquid level in the generator. (3) The absorption refrigerator according to claim 1, wherein the physical quantity is pressure within the generator. (4) The absorption refrigerator according to claim 1, wherein the physical quantity is a temperature in a generator.