JPH0718618B2 - Cold temperature switching absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cold / temperature switching equipped with a gas discharge device for extracting uncondensed gas in an absorber using an absorbing liquid and discharging the extracted gas to the outside of the machine. Type absorption refrigerator (hereinafter referred to as this type of absorption refrigerator)
Regarding the improvement of.

(B) Conventional technology As a conventional technology of this type of absorption refrigerator, the non-condensed gas in the absorber is extracted by the ejector action of the absorbing liquid injected from the pump, and is retained in the gas storage section to be vacuum pumped. There is known one that exhausts to the outside of the machine [for example, JP-A-58-26976]. Further, as another conventional technique, the non-condensable gas in the absorber is extracted together with the refrigerant vapor by the refrigerant absorbing action of the absorbing liquid, and these are separated to store the non-condensed gas in the storage chamber. There is known an exhaust pipe that exhausts the air to the outside of the machine [for example, Japanese Patent Laid-Open No. 60-71866].

(C) Problems to be solved by the invention In this type of absorption refrigerator, the pressure inside the evaporator and the absorber during cold water extraction operation is at most about 10 mmHg at the highest, but during the hot water extraction operation It may increase up to about 200 mmHg. Therefore, during the hot water extraction operation, the pressure of the evaporator and the absorber pushes the absorbing liquid to the side of the non-condensable gas discharging device such as the gas storage chamber more than necessary, and the absorbing liquid circulating in the machine tends to be insufficient. There is a problem that it is easy to cause cavitation of the pump and emptying of the generator. In addition, depending on the case, there are various problems that the absorbing liquid may flow into the vacuum pump or the gas discharge pipe made of palladium metal and damage them.

The present invention aims to provide an absorption refrigerator of this type that can reliably solve these problems and can safely continue the hot water extraction operation.

(D) Means for Solving the Problems As a means for solving the above problems, the present invention includes a blocking device for stopping the flow of the absorbing liquid in the middle of the flow path of the non-condensable gas discharging device and the blocking device. This type of absorption refrigerating machine is provided with a drive device that automatically operates during the hot water extraction operation.

(E) Action This type of absorption refrigerating machine of the present invention exerts a function [action] of cutting off the flow of the absorbing liquid to the side of the non-condensable gas discharging device during the hot water take-out operation, so that a shortage of absorbing liquid in the machine occurs. It is possible to prevent the cavitation of the absorption liquid pump and the water heating of the generator, so that the hot water extraction operation can be safely continued. In addition, it is possible to prevent the absorption liquid from entering the vacuum pump, the palladium metal tube, etc., and prevent the damage.

(F) Embodiments The drawings are schematic configuration diagrams showing an embodiment of an absorption refrigerator of this type according to the present invention. In the figure, (1) is a high temperature generator, (2) is a low temperature generator, (3) is a condenser, and (4).
Is an evaporative absorber comprising an evaporator (5) and an absorber (6), (7) and (8) are low temperature and high temperature solution heat exchangers, (P _A ).
Is a pump for absorbing liquid, (9) is a separator, and these are pipes (10), (11) through which the refrigerant flows, and pipes (1) through which the refrigerant liquid flows.
2), pipes (13), (14), (15), through which rare absorbent is sent
(16), pumping pipe (17), pipes (18), (19) where intermediate concentration absorption liquid flows, pipes (20), (21) where concentrated absorption liquid flows,
Circulation of refrigerant [water] and absorption liquid [lithium bromide aqueous solution] similar to a conventional absorption refrigerator of this type [hereinafter referred to as a conventional machine] by connecting with a pipe (22) equipped with a cold temperature switching valve (V _CH ). By forming the passage, a cold / temperature switching type absorption refrigerator (hereinafter referred to as this machine) is configured.

(B) is a burner of the high temperature generator (1), (23) is a heater of the low temperature generator (2), (24) is a cooler of the condenser (3),
(25) is a heat exchanger of the evaporator (5), and (26) is a cooler of the absorber (6). Further, (SW _CH ) is a cold / hot changeover switch.

Then, during the cold water take-out operation of this machine, an absorption refrigeration cycle is generated by circulating the refrigerant and the absorbing liquid as in the conventional machine, and heat is exchanged by latent heat of vaporization of the refrigerant in the heat exchanger (25) of the evaporator (5). The water in the vessel (25) is cooled to about 6-8 ° C and taken out. In addition, during the hot water extraction operation of this machine, the cooling water supply to the coolers (26) and (24) is stopped in the same way as the conventional machine, while the cold / hot switching valve (V _CH ) is turned on by the cold / hot switching switch (SW _CH ). Open and guide the high-temperature absorption liquid and refrigerant vapor to the evaporation absorber (4) via the pipe (22), and heat by the latent heat of condensation of the refrigerant (or this heat and the sensible heat of the absorption liquid) in the heat exchanger (25). The water in the exchanger (25) is heated and taken out.

Moreover, (29) and (27) are bleeding pipes arranged in the absorber (6), (28) is a bleeding trap, and (29) is a pipe for flowing the absorbing liquid into the bleeding trap (28). A channel, (30) is a temperature lowering device for absorbing liquid arranged in the middle of the pipe line (29), and (31) is a pipe line (29) connected to the lower part, while the liquid overflows to the evaporation absorber (4) at the upper part. A liquid reservoir having a flow outlet, (32) is a conduit for sending a part of the absorbing liquid discharged from the absorbing liquid pump (P _A ) to the liquid reservoir (31), and (33) is an extraction trap ( 2
A conduit for guiding the non-condensable gas extracted in 8) to the gas-liquid separator (34) by siphon action together with the absorbing liquid, and (35) to the absorbing liquid separated in the gas-liquid separator (34) to the absorber (6). Return conduit,
(36) is a conduit for guiding the non-condensable gas separated by the gas-liquid separator (34) to the tank (T), (37) is a hydrogen release pipe (38) made of palladium metal for the gas in the tank (T). ), And the gas discharge device of this machine is constructed in the same manner as the conventional gas discharge device by these pipes and equipment. And (V) is a motor-operated valve arranged in the pipeline (32),
This motor-operated valve is electrically connected to the cold / hot changeover switch (SW _CH ) so as to be closed in conjunction with the opening operation of the cold / hot changeover valve (V _CH ). In addition, (39) is an orifice provided in the conduit (32).

In this machine equipped with such a gas discharge device, during the cold water extraction operation, the motor-operated valve (V) is opened by the cold / hot changeover switch (SW _CH ) so that the absorbing liquid circulates in the gas discharge device. Like the discharge device, the internal pressure of the extraction trap (28) is kept lower than that in the evaporative absorber (4), and the non-condensable gas is extracted into this, and the gas-liquid separator (34) is passed through the pipe line (33).
Flow into the tank (T) while the absorbing liquid is returned to the absorber (6). Then, the gas is discharged into the atmosphere through the hydrogen discharge pipe (38). Most of the non-condensable gas is hydrogen gas. In addition, the internal pressure of the evaporative absorber (4) is maintained at 10 mmHg or less during the cold water extraction operation of this machine, and the pressure difference between this evaporative absorber and the tank (T) is small, so the liquid level of the absorbing liquid is Located on road (36). Therefore, the absorbing liquid sent to the gas discharge device by the absorbing liquid pump (P _A ) is not stored in the tank (T) as in the case of the conventional machine, and the liquid shortage in the machine does not occur.

On the other hand, during the hot water extraction operation, the evaporative absorber (4)
Since the internal pressure is maintained at 150 to 200 mmHg, the liquid level in the pipe line (36) becomes higher than during the cold water extraction operation and reaches the tank (T). In the case of a conventional machine that does not have a valve in the pipe line (32), the absorption liquid sent to the gas discharge device is supplied to the tank (T). If this is left as it is, the liquid in the machine will be insufficient. dry frying would be cause of the resulting by absorbing liquid pump (P _a) of the cavitation and high temperature generator (1).

On the other hand, in the case of this machine, the motor-operated valve (V) is closed by the cold / hot changeover switch (SW _CH ) at the same time as the start of the hot water extraction operation, and the supply of the absorbing liquid to the gas discharge device is cut off.
The supply of the absorbing liquid to the tank (T) is also stopped, the occurrence of liquid shortage in the machine can be reliably prevented, and the operation can be continued safely. In addition, in this machine, the electric valve (V) is connected to the pipe (29).
It may also be deployed in the pipeline (36). Moreover, instead of the motor-operated valve, a solenoid valve or a check valve may be used as a shutoff device for stopping the flow of the liquid. In this machine, it goes without saying that the absorber (6) side opening end of the pipe (35) is arranged in the vapor phase portion of the evaporation absorber (4).

Although not shown in the figure, even when this machine is equipped with a gas discharge device for extracting the non-condensable gas by the ejector action of the absorbing liquid, a shutoff device such as an electric valve (V) is provided in the middle of the flow path of this device. With the provision of, the hot water extraction operation can be safely connected. In addition, it is needless to say that the present apparatus can prevent the liquid from entering the hydrogen discharge pipe (38) used in the gas discharge device and the vacuum pump. Furthermore, although not shown, it goes without saying that the present invention can be applied to this type of absorption refrigerator having a single effect.

(G) Effect of the Invention As described above, the absorption refrigerator of the present invention according to the present invention automatically cuts off the supply of the absorption liquid to the non-condensable gas discharge device during the hot water extraction operation in which the vapor pressure in the evaporation absorber increases. As a result, it is possible to prevent the outflow of a large amount of absorbing liquid to the device side and prevent the occurrence of liquid shortage inside the machine, and it is possible to reliably prevent cavitation of the absorbing liquid pump and emptying of the generator. It can prevent the liquid from entering the vacuum pump, the palladium metal pipe, etc. to prevent these damages, and has a practical effect that the hot water extraction operation can be safely continued.

[Brief description of drawings]

The drawings are schematic explanatory views showing an embodiment of an absorption refrigerator of this type according to the present invention. (1) …… High temperature generator, (2) …… Low temperature generator, (3)
...... Condenser, (4) …… Evaporation absorber, (5) …… Evaporator, (6) …… Absorber, (P _A ) …… Absorbing liquid pump,
(28) …… Bleed trap, (T) …… Tank, (2
9), (32), (33), (36) ... Pipe line, (38) ... Hydrogen release pipe, (V _CH ) ... Cold / hot switching valve, (SW _CH ) ... Cold / hot switching switch, (V ) …… Motor operated valve.

Claims (1)

[Claims] 1. A cold-temperature switching absorption refrigerating machine equipped with a gas discharge device for extracting non-condensable gas in an evaporator and the outside of the device while using an absorbing liquid in the machine, A cooling / cooling-type absorption refrigeration system characterized in that a shutoff device for stopping the flow of the absorbing liquid is provided in the middle of the flow path, and a drive device for automatically operating the shutoff device during the operation of taking out warm fluid is provided. Machine.