JPH079002Y2 - Absorption refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorption chiller.

2. Description of the Related Art Recently, for example, there is an air conditioner for indoor use that uses an absorption refrigerator, and an absorption liquid (for example, an aqueous solution of lithium bromide) is used for this absorption refrigerator. By the way, the concentration of this absorbing solution is high, and if the operation is stopped in this state and the temperature of the absorbing solution decreases, crystals will precipitate, and crystallization work etc. will be required when restarting the operation. ,
Conventionally, a dilution operation was performed to dilute the concentration of the absorbing solution before the operation was stopped.

Problems to be Solved by the Invention According to the above-described conventional configuration, it is preferable that the dilution operation can be performed, but there is a problem that the dilution operation cannot be performed during an emergency stop such as a power failure.

Then, this invention aims at providing the absorption type refrigerator which can eliminate the said problem.

Means for Solving the Problems In order to solve the above problems, the absorption refrigerator of the present invention is
An evaporator that evaporates the heat medium, an absorber that absorbs the heat medium vapor generated in this evaporator into an absorption liquid, and a regenerator that absorbs the heat medium vapor and heats the rare absorption liquid that has become thin, A condenser for condensing the heat medium vapor obtained in this regenerator, a rare absorbent transfer pipe for transferring the rare absorbent in the absorber to the regenerator, and a concentrated absorbent regenerated in the regenerator. Transfer pipe for transferring the concentrated absorbent to the evaporator, transfer pipe for transferring the heat medium condensed in the condenser to the evaporator, and a first automatic opening / closing valve in the middle, and transfer of the concentrated absorbent A concentrated absorbent discharge pipe that discharges the concentrated absorbent in the middle of the pipe into the absorber or the liquid storage tank by gravity, and a second automatic opening / closing valve in the middle, and the heat medium in the evaporator is gravity driven. Consists of a heat medium introduction pipe that leads into the rare absorption liquid transfer pipe, and during an emergency stop In which said first and second automatic opening and closing valve is configured to be opened.

Action In the above configuration, when the operation is stopped, each automatic opening / closing valve is opened, the concentrated absorbent in the concentrated absorbent transfer pipe is discharged into the absorber or the reservoir tank, and the rare absorbent transfer pipe receives heat. Since the medium is introduced to dilute the concentration of the absorbing liquid, crystals do not precipitate in the pipe even if the temperature of the absorbing liquid decreases.

Embodiment An embodiment of the present invention will be described below with reference to a schematic diagram showing a schematic configuration of an absorption refrigerator.

The absorption refrigerating machine in the present embodiment is an example of a heat medium, an evaporator 1 that evaporates water, and a lithium bromide that guides water vapor generated in the evaporator 1 through a communication part 2 and absorbs the water vapor. Absorber 3 having (LiBr) aqueous solution (hereinafter referred to as "absorption liquid"), regenerator 4 that absorbs water vapor and heats the dilute absorption liquid that has become thin, and generated by being heated by this regenerator 4 Transferring the rare absorbed liquid in the absorber 3 to the regenerator 4 having a condenser 6 for guiding the generated water vapor through the communication part 5 and condensing the water vapor, and a solution pump 7 on the way. Tube 8 and the condenser 6
The condensed water transfer pipe 9 for transferring the condensed water condensed in 1 to the evaporator 1 and the heat transfer medium pump 10 in the middle, and the condensed water which is the heat medium accumulated at the bottom of the condenser 6 is transferred to the condensed water transfer pipe 9 Condensed water circulation pipe that circulates in the condenser 6 through a part of
11, a concentrated absorption liquid transfer pipe 12 for transferring the concentrated absorption liquid, which has become thick due to the separation of water vapor in the regenerator 4, to the absorber 3, and a fluid to be cooled, such as water, arranged in the evaporator 1 A first heat exchanger 13 for cooling, a second heat exchanger 14 for internal cooling arranged in the absorber 3, and a first heat exchanger 13 for introducing water as a fluid to be cooled. Fluid pipe 15 for cooling,
A cooling fluid pipe for introducing cooling water, which is a cooling fluid, to the second heat exchanger 14 (the outlet side portion of this cooling fluid pipe is introduced into the condenser 6 so as to remove the heat of condensation. ) 16
And a heating pipe 17 arranged in the regenerator 4 for heating the absorbing liquid.
And a heat recovery device 18 provided between the concentrated absorbent transfer pipe 12 and the rare absorbent transfer pipe 8 for recovering the heat of the concentrated absorbent to the rare absorbent side, and one end of the concentrated heat absorber 18. A concentrated absorbent discharge pipe 20 connected to the middle of the liquid transfer pipe 12, the other end of which is opened to the bottom of the absorber 3 and the first automatic opening / closing valve 19 is interposed, and one end of which is condensed. A condensed water introduction pipe (heat medium introduction pipe) 22 connected to the water circulation pipe 11 and having the other end connected to the rare absorbent transfer pipe 8 and a second automatic opening / closing valve 21 interposed therebetween. It consists of Further, in the concentrated absorbent discharge pipe 20 and the condensed water introduction pipe 22, the respective liquids are caused to flow by gravity, that is, by spontaneous fall. That is, the concentrated absorbent discharge pipe 20 is
The lowermost position is provided so as to always be located above the liquid level in the absorber 3, and the evaporator 1 is provided so as to be always located above the liquid level in the absorber 3. Further, the first and second automatic open / close valves 19 and 21 are assembled with an electric circuit so that they are opened during an emergency stop of operation, for example, during a power failure.

In the above configuration, during normal operation, the cooling function is exerted by repeating the evaporation, absorption, regeneration, and condensation actions. For example, water that is a fluid to be cooled circulated in the indoor heat exchanger of the air conditioner is cooled by the first heat exchanger 13 provided in the evaporator 1. During the above normal operation, the concentration of the concentrated absorbing liquid is about 61%, and the concentration of the rare absorbing liquid is about 57%.

Then, during operation, for example, when the operation is stopped due to a power failure, the first and second automatic opening / closing valves 19 and 21 are automatically opened, and the concentrated absorbent in the concentrated absorbent transfer pipe 12 is discharged into the absorber 3. At the same time, water, which is a heat medium, flows into the dilute absorption liquid transfer pipe 8 and its concentration is diluted to about 25% to 35%. This concentration is a concentration that does not crystallize even when the temperature of the absorbing liquid decreases. Thus, during an emergency stop of operation, most of the concentrated absorbent in the concentrated absorbent transfer pipe 12 is discharged into the absorber 3, and the diluted absorbent in the rare absorbent transfer pipe 8 is diluted to a predetermined concentration. Therefore, crystals do not precipitate in each transfer pipe, and therefore, it is not necessary to perform the crystallization process when the operation is restarted in the case of an emergency stop. At the normal end, the conventional dilution operation is performed.

By the way, in the drawings, the evaporator 1, the absorber 3, the regenerator 4 and the condenser 6 are shown in an integrated manner, but of course, this is a schematic diagram, and therefore, in practice, each device may be different depending on the case. It is configured separately. Further, although water is used as the heat exchange fluid in the absorber 3, the condenser 6, etc., of course, a gas such as air may be used.

Further, in the above embodiment, the solution in the regenerator 4 is not particularly diluted, but even if it crystallizes, there is no problem because it dissolves when reheated. For example, the concentrated absorbent discharge pipe 20
Similarly to the above, a pipe having an automatic opening / closing valve may be separately provided to discharge to the bottom of the absorber.

By the way, in the above-described embodiment, the concentrated absorbent in the concentrated absorbent transfer pipe is discharged into the absorber, but a separate reservoir tank is provided so that the concentrated absorbent is discharged into the reservoir tank. You may

Effect of the Invention According to the configuration of the present invention described above, at the time of an emergency stop of operation, each automatic opening / closing valve is opened so that the concentrated absorbent in the concentrated absorbent transfer pipe is discharged into the absorber or the reservoir tank, and the rare absorbent is also absorbed. Since the heat medium is introduced into the transfer pipe to dilute the concentration of the absorbing liquid, crystals do not precipitate in the pipe even if the temperature of the absorbing liquid is lowered, and therefore, no crystallization work is required when restarting the operation.

[Brief description of drawings]

The drawings are schematic views showing a schematic configuration of an absorption refrigerator according to an embodiment of the present invention. 1 ... Evaporator, 3 ... Absorber, 4 ... Regenerator, 6 ... Condenser, 8 ... Rare absorbent transfer pipe, 9 ... Condensate transfer pipe, 11
...... Condensed water circulation pipe, 12 ...... Concentrated absorbent transfer pipe, 19 ...... First automatic opening / closing valve, 20 ...... Dense absorbent discharging pipe, 21 ...... Second automatic opening / closing valve, 22 ...... Condensed water introduction pipe .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Sakabata 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Yosuke Kawauchi 1-6, Edobori, Nishi-ku, Osaka City, Osaka Prefecture 14 Hitachi Shipbuilding Co., Ltd. (72) Inventor Tatsuhiko Umeda 1-6-14 Edobori, Nishi-ku, Osaka-shi, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Masaharu Furuji 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd. (72) Mitsufumi Matsuda 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Takeshi Yano 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Incorporated (72) Inventor Hideaki Okamoto 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (56) Reference JP-A-57-74562 ( P, A) JP Akira 51-52545 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An evaporator for evaporating a heat medium, an absorber for absorbing a heat medium vapor generated in the evaporator into an absorbing liquid, and a rare absorbing liquid whose concentration is thinned by absorbing the heat medium vapor. Regenerator, a condenser for condensing the heat medium vapor obtained in the regenerator, a rare absorbent transfer pipe for transferring the rare absorbent in the absorber to the regenerator, and a regenerator regenerated in the regenerator. A rich absorption liquid transfer pipe for transferring the concentrated absorption liquid to the absorber, a heat medium transfer pipe for transferring the heat medium condensed in the condenser to the evaporator, and a first automatic opening / closing valve provided in the middle A concentrated absorbent discharge pipe for discharging the concentrated absorbent in the middle of the concentrated absorbent transfer pipe into the absorber or the reservoir tank by gravity, and a second automatic opening / closing valve provided in the middle of the concentrated absorbent transfer pipe It is composed of a heat medium introducing pipe that guides the heat medium into the rare absorbent transfer pipe by gravity, and Emergency stop absorption refrigerating machine, characterized in that said first and second automatic opening and closing valve is configured so as to be opened at the time.