JPH07190539A - Absorption type refrigerating cycle equipment - Google Patents

Abstract

PURPOSE:To shorten the time or radiation of a heating part after combustion of fuel is ended. CONSTITUTION:A high-temperature regenerator 3 of absorption type refrigerating cycle equipment 1 is provided with a heating part 2 for heating an absorbing liquid. This heating part 2 is provided with a combustion device 11 which heats the absorbing liquid in a heating vessel 10 by a heat obtained from combustion of a gas. This combustion device 11 has a gas burner combusting the gas and a blower for combustion for sending air for combustion to the gas burner and the gas combusted by the gas burner passes along the periphery of the heating vessel 10 and is exhausted from an exhaust port. A radiating means 91 of a control device 18 operates the blower for combustion when the combustion of the gas is ended. By operating the blower for combustion after the combustion of the gas is ended, air flows along the periphery of the heating vessel 10 and cools down the heating vessel 10 and the absorbing liquid in the heating vessel 10 forcibly. When the temperature of the absorbing liquid in the heating vessel 10 lowers to 100 deg.C or below, the operation of the blower for combustion is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion for heating an absorbing liquid in a heating container by heating a heating container supplied with the absorbing liquid with heat generated by combustion of a fuel (gas or liquid fuel). The present invention relates to an absorption type refrigeration cycle device including a heating unit of the formula.

[0002]

2. Description of the Related Art The basic constitution of an absorption type refrigeration cycle apparatus is a regenerator for heating an absorbing liquid to vaporize a part of the absorbing liquid, and a condenser for cooling and liquefying a vaporized refrigerant generated in the regenerator. A condenser, an evaporator that evaporates the liquefied refrigerant liquefied by this condenser under low pressure, and an absorber that absorbs the vaporized refrigerant evaporated by this evaporator into an absorption liquid, and when the refrigerant evaporates in the evaporator In addition, heat is taken from a heat medium (water or the like) exchanged with the refrigerant in the evaporator to cool the heat medium.
The cooled heat medium is used for cooling the room when it exchanges heat with the indoor air, and when it exchanges heat with the air in the adiabatic cabinet, it cools the cabinet.

The regenerator has a heating section for heating the absorbing liquid. The heating unit includes a heating container to which the absorbing liquid is supplied from the absorber, and the heating liquid is heated in the heating container (combustion device) to heat the absorbing liquid in the heating container.

[0004]

When the heating of the heating container by the heating means is completed after the operation of the absorption refrigeration cycle apparatus is completed, the residual heat of the heating container, the residual heat of the heating means, etc.
There is a problem that the absorption liquid is heated and its concentration increases, causing the absorption liquid to crystallize. When the absorption liquid crystallizes in the absorption refrigeration cycle apparatus, when it is restarted, the crystallized absorption liquid hinders the circulation of the absorption liquid and the restart cannot be performed.

Therefore, even after the end of the operation, the temperature and concentration of the absorbing liquid are made uniform until the temperature of the absorbing liquid falls to a temperature at which the absorbing liquid does not crystallize in the cycle.
Although the pump that supplies the absorbing liquid from the absorber to the heating container is operated, it takes a long time for the temperature of the absorbing liquid to decrease only by operating the pump.

Further, since the heating container is exposed to a high temperature and an absorbing liquid having a strong corrosive force is disposed inside, the material having excellent corrosion resistance (for example, stainless steel, glass lined metal, etc.), It uses a thick metal material that allows for corrosion. A material having excellent corrosion resistance and a thick metal material have a large heat capacity, so that it takes a long time to dissipate heat.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorption type refrigeration cycle apparatus in which the heat radiation time of the heating section after the operation is short.

[0008]

The absorption refrigeration cycle apparatus of the present invention employs the following technical means in order to achieve the above object. The absorption refrigeration cycle device includes a heating unit that heats the absorbing liquid, and a regenerator that vaporizes a part of the absorbing liquid by heating the absorbing liquid by the heating unit and a vaporized refrigerant that is generated in the regenerator. And a liquefied refrigerant, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, and an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorption liquid. And, the heating unit,
A heating container to which the absorbing liquid is supplied, a burner for burning the fuel, and a burner for heating the absorbing liquid in the heating container by heating the heating container by the heat generated by the combustion of the fuel, and a burner for burning the burner. And a blower for combustion. Furthermore, the absorption refrigeration cycle apparatus, even after the end of fuel combustion in the burner,
A heat radiating means is provided which operates the combustion blower until the temperature of the absorbing liquid drops below a predetermined temperature.

The heat radiating means is provided with a temperature sensor for detecting that the temperature of the absorbing liquid has dropped below a predetermined temperature, the temperature of the absorbing liquid, the temperature of the absorbing liquid in the heating container, or the temperature of the heating container. You may detect by the temperature which this temperature sensor detects. Alternatively, the heat radiating means may set that the temperature of the absorbing liquid has dropped to a predetermined temperature or lower, based on the time after the burner has finished the combustion operation. In this case, the set time may be changed based on other physical data such as the outside air temperature.

Further, the absorption refrigeration cycle apparatus according to the present invention may employ the following means. The absorption type refrigeration cycle device is provided with a pump that supplies the absorption liquid from the absorber to the heating container, and this pump dissipates heat until the temperature of the absorption liquid falls below a predetermined temperature even after the fuel combustion in the burner is completed. Driven by

[0011]

The absorption refrigeration cycle apparatus of the present invention has the following functions. When the combustion of the fuel in the burner is completed, the heat radiating means operates the combustion blower. The air flow generated by the combustion blower flows into the heating container, takes heat from the heating container, and is discharged. Therefore, a heating container,
The heating section through which the air flow generated by the combustion blower passes is forcibly cooled by the air flow. When the temperature of the absorbing liquid drops below a predetermined temperature, the heat dissipation means stops the operation of the combustion blower, and the heat dissipation operation ends.

[0012]

As described above, in the absorption refrigeration cycle apparatus of the present invention, after the operation is completed, the heating section including the heating container is forcibly cooled by the air flow generated by the combustion blower. The heat radiation time of the heating unit including the container is shortened as compared with the conventional case. Therefore, it is possible to quickly reach a state where the absorbing liquid does not crystallize and is below a predetermined temperature.

By adopting the second aspect, when the combustion of the fuel in the burner is completed, the heat radiation means operates the pump. By operating the pump, since the absorbing solution having a relatively low temperature is supplied from the absorber into the heating container, the heat dissipation time of the heating container can be shortened together with the forced cooling of the heating container by the combustion blower. .

[0014]

EXAMPLE Next, the absorption refrigeration cycle apparatus of the present invention was
A description will be given based on an embodiment shown in the drawing. [Configuration of Embodiment] FIGS. 1 to 6 show an embodiment, and FIG. 5 is a schematic configuration diagram of a double-effect absorption refrigeration cycle apparatus for air conditioning the room. The double-effect absorption refrigeration cycle apparatus 1 includes a heating unit 2 for heating a low-concentration absorbent (lithium bromide aqueous solution in this embodiment), and heating the low-concentration absorbent by the heating unit 2. The high-temperature regenerator 3 that vaporizes (evaporates) the refrigerant contained in the low-concentration absorption liquid to convert the low-concentration absorption liquid into the medium-concentration absorption liquid, and the condensation heat of the vaporized refrigerant in the high-temperature regenerator 3 The low-temperature regenerator 4 that heats the absorption liquid to vaporize the refrigerant contained in the medium-concentration absorption liquid to convert the medium-concentration absorption liquid into the high-concentration absorption liquid, and the vaporized refrigerant (steam) from the high-temperature regenerator 3 and the low-temperature regenerator 4 5) for cooling and liquefying), and an evaporator 6 for evaporating the liquefied refrigerant (water) liquefied in the condenser 5 under a pressure close to vacuum.
And an absorber 7 for absorbing the vaporized refrigerant evaporated in the evaporator 6 into the high-concentration absorption liquid obtained in the low temperature regenerator 4.

By evaporating the liquefied refrigerant in the evaporator 6, the heat medium (cold water) passing through the evaporator 6 is cooled,
The cooled heat medium exchanges heat with the air blown into the room air in the room heat exchanger 8 arranged in the room to cool the room. The heat medium whose temperature has risen by exchanging heat with the air blown into the room in the indoor heat exchanger 8 is cooled by evaporating the liquefied refrigerant in the evaporator 6 again.

The vaporized refrigerant evaporated in the evaporator 6 is absorbed in the absorber 7.
Is absorbed by the high-concentration absorbent. At that time, heat of absorption is generated and the temperature of the absorbing liquid rises. Therefore, in order to increase the absorption capacity of the high-concentration absorbent supplied to the absorber 7 by removing the absorption heat, cooling water for cooling the high-concentration absorbent is supplied to the absorber 7. Further, in the condenser 5, cooling water is supplied in order to liquefy the vaporized refrigerant having a relatively high temperature generated in the low temperature regenerator 4. And in this embodiment,
The cooling water that has passed through the absorber 7 is supplied to the condenser 5. Then, the cooling water which has passed through the absorber 7 and the condenser 5 and whose temperature has risen is cooled by the cooling tower 9 provided outside, and is again supplied to the absorber 7 and the condenser 5.

[Explanation of High-Temperature Regenerator 3 Including Heating Unit 2] The heating unit 2 heats the low-concentration absorbing liquid by the heat generated by the combustion of gas, and is excellent in corrosion resistance to which the absorbing liquid is supplied. It is composed of a heating container 10 made of stainless steel and a combustion device 11 for combusting gas. The details of the heating container 10 and the combustion device 11 will be described later.

The low-concentration absorbent liquid that has boiled in the heating container 10 is regenerated at a high temperature in the shape of a cylindrical container provided at the upper part of the heating container 10 from a blow-out tube 12 extending upward from the heating container 10 together with vapor (vaporized refrigerant). Blow out into the container 13. The high-temperature low-concentration absorption liquid blown out into the high-temperature regeneration container 13 collides with the gas-liquid separation baffle 13a. The refrigerant evaporated from the low-concentration absorption liquid becomes a vaporized refrigerant, and the absorption liquid dropped around the blowout tube 12 becomes a medium-concentration absorption liquid. The vaporized refrigerant is cooled by the peripheral wall of the high temperature regeneration container 13 and is liquefied to become a liquefied refrigerant.

In order to separate the liquefied refrigerant (water) and the medium-concentration absorption liquid, the blow-out cylinder 12 is provided in the high temperature regeneration container 13.
A partition cylinder 14 is provided between the high temperature regeneration container 13 and the high temperature regeneration container 13. Then, the liquefied refrigerant (water) that has been cooled by the peripheral wall of the high temperature regenerator 13 and liquefied and separated to the outside of the partition cylinder 14 is
The medium-concentration absorption liquid supplied to the condenser 5 through the liquefied refrigerant pipe 15 connected to the lower part and separated between the inside of the partition cylinder 14 and the blow-off cylinder 12 is the middle-concentration absorption liquid pipe connected to the lower part. It is supplied to the low temperature regenerator 4 through 16. An electromagnetic valve 17 is provided in the medium-concentration absorbent liquid pipe 16.

[Description of Low Temperature Regenerator 4]
Cylindrical container-shaped low-temperature regeneration container 2 that covers the high-temperature regeneration container 13
0, the medium-concentration absorption liquid supplied through the medium-concentration absorption liquid pipe 16 is injected toward the ceiling portion of the high-temperature regeneration container 13. Since the temperature in the low temperature regeneration container 20 is lower than the temperature in the high temperature regeneration container 13, the low temperature regeneration container 2
The pressure in 0 is lower than the pressure in the high temperature regeneration container 13.
For this reason, the low-temperature regeneration container 20 is connected from the medium-concentration absorbent liquid pipe 16.
The medium-concentration absorption liquid supplied to the inside easily evaporates, and when the medium-concentration absorption liquid is injected into the ceiling portion of the high-temperature regeneration container 13, the medium-concentration absorption liquid is heated by the peripheral wall of the high-temperature regeneration container 13. The contained refrigerant evaporates and becomes a vaporized refrigerant, and the absorbing liquid becomes a high-concentration absorbing liquid.

Here, the upper part of the low temperature regeneration container 20 is connected to the upper part of the condensing container 21 in the shape of an annular container by a communication part 22. Therefore, the vaporized refrigerant evaporated in the low temperature regeneration container 20 is supplied into the condensing container 21 via the communication part 22. On the other hand, the high-concentration absorbent is dropped to the lower portion of the low-temperature regeneration container 20 and is supplied to the absorber 7 through the high-concentration absorbent liquid pipe 23 connected to the lower portion of the low-temperature regeneration container 20.

A ceiling plate 24 is provided on the upper side of the low temperature regeneration container 20, and a gap 25 through which steam passes is provided between the outer peripheral end of the ceiling plate 24 and the low temperature regeneration container 20. There is.

[Description of Condenser 5] The condenser 5 includes the condensation container 21 in the shape of an annular container as described above. A condensing heat exchanger 26 that cools and liquefies the vaporized refrigerant in the condensing container 21 is disposed inside the condensing container 21.
The heat exchanger 26 for condensing is an annular coil through which cooling water flows. Then, the vaporized refrigerant supplied from the low temperature regenerator 4 into the condensing container 21 is cooled by the condensing heat exchanger 26 and liquefied, and the condensing heat exchanger 26.
Drop below.

On the other hand, below the condensing vessel 21, the refrigerant is supplied from the above-mentioned high temperature regenerator 3 through the liquefied refrigerant pipe 15. When the supply refrigerant is supplied into the condensing container 21, it reboils due to the difference in pressure (the condensing container 21 has a low pressure of 70 mmHg), and the vaporized refrigerant and the liquefied refrigerant are in a mixed state. Further, the condensing container 21 is connected to a low-temperature liquefied refrigerant supply passage 31 that guides the liquefied refrigerant to the evaporator 6.
The low-temperature liquefied refrigerant supply path 31 is provided with an electromagnetic opening / closing valve 32 that opens by energization. This solenoid on-off valve 3
2 is for adjusting the supply amount of the liquefied refrigerant supplied from the condensing container 21 to the evaporator 6, and the energization is controlled by the control device 18.

[Description of Evaporator 6] The evaporator 6 includes an absorber 7
At the same time, it is provided in the lower part of the condensing container 21, and is provided with an evaporative absorption container 33 in the shape of an annular container provided around the low temperature regeneration container 20. An evaporation heat exchanger 34 for evaporating the liquefied refrigerant supplied from the condenser 5 is arranged outside the inside of the evaporation / absorption container 33. The heat exchanger 34 for evaporation is an annular coil, and the heat medium (cool / warm water) supplied to the indoor heat exchanger 8 flows inside.
Then, the liquefied refrigerant supplied from the condenser 5 via the low-temperature liquefied refrigerant supply passage 31 is scattered on the evaporation heat exchanger 34 from the refrigerant spraying tool 35 arranged on the evaporation heat exchanger 34. It

Since the inside of the evaporation / absorption container 33 is maintained in a substantially vacuum (for example, 6.5 mmHg), the boiling point is low, and the liquefied refrigerant dispersed in the evaporation heat exchanger 34 is very likely to evaporate. Then, the liquefied refrigerant scattered on the heat exchanger for evaporation 34 evaporates by taking heat of vaporization from the heat medium flowing inside the heat exchanger for evaporation 34. As a result, the heat medium flowing in the evaporation heat exchanger 34 is cooled. The cooled heat medium is guided to the indoor heat exchanger 8 and exchanges heat with the air blown into the room to cool the room.

[Description of Absorber 7] As described above, the absorber 7 includes the evaporative absorption container 33. And the absorber 7
Inside the evaporative absorption container 33, an absorption heat exchanger 37 for cooling the high-concentration absorption liquid supplied from the high-concentration absorption liquid pipe 23 is arranged. This absorption heat exchanger 37
Is an annular coil through which the cooling water supplied to the condensation heat exchanger 26 flows. On the other hand, above the absorption heat exchanger 37, an absorption liquid sprinkler 38 that disperses the high-concentration absorption liquid supplied from the high-concentration absorption liquid pipe 23 onto the absorption heat exchanger 37 is arranged.

Then, the high-concentration absorption liquid sprinkled on the absorption heat exchanger 37 absorbs the vaporized refrigerant evaporated from the evaporation heat exchanger 34 into the evaporation absorption container 33 while falling from the upper side to the lower side. . For this reason, a low-concentration absorption liquid that has absorbed the vaporized refrigerant and has a low concentration is supplied to the bottom of the absorption heat exchanger 37. A low-concentration absorption liquid pipe 39 for supplying the low-concentration absorption liquid supplied to the bottom to the heating container 10 of the heating unit 2 is connected to the bottom of the absorption heat exchanger 37. In this low-concentration absorbent liquid pipe 39, in order to flow the low-concentration absorbent liquid from the absorption heat exchanger 37 in a substantially vacuum state toward the heating container 10, the electric pump 40 for absorbing liquid (the pump according to claim 2 is provided. (Corresponding) is provided. The electric power of the electric pump 40 for absorbing liquid is controlled by the controller 18.

[Description of Indoor Heat Exchanger 8] Indoor Heat Exchanger 8
Is a heat exchanger for exchanging heat between the heat medium passing through the inside and the air blown into the room. And the indoor heat exchanger 8
The heat medium that has passed through is sent to the evaporation heat exchanger 34 by the cold / hot water electric pump 41 and circulates between the indoor heat exchanger 8 and the evaporation heat exchanger 34.

On the other hand, the indoor heat exchanger 8 is a room for forcibly exchanging heat between the heat medium flowing through the indoor heat exchanger 8 and the air blown into the room, and blowing the air after the heat exchange into the room. For electric fan 42. The cold / hot water electric pump 41 and the indoor electric fan 42 are connected to the control device 1
The energization is controlled by 8.

[Explanation of the cooling tower 9] The cooling tower 9 of this embodiment
The cooling water, which has passed through the absorption heat exchanger 37 and the condensation heat exchanger 26, flows from the upper side to the lower side, exchanges heat with the outside air to radiate heat while flowing, and partially evaporates while flowing. Then, the evaporation heat is taken from the cooling water flowing at the time of evaporation to cool the cooling water flowing.

The cooling water cooled in the cooling tower 9 is guided to the cooling water reservoir 53 provided at the lower part, and from this cooling water reservoir 53, the cooling water is pumped by an electric pump 54 for cooling water to the heat exchanger 37 for absorption and condensation. It flows to the heat exchanger 26 for use. The cooling water reservoir 53 is provided so as to replenish the cooling water when the height of the internal liquid level decreases. on the other hand,
The cooling tower 9 includes an outdoor electric fan 55 for cooling the cooling water. This outdoor electric fan 55 is used for the cooling tower 9
The airflow is generated in the cooling tower 9 and promotes cooling of the cooling water in the cooling tower 9. The controller 18 controls the energization of the cooling water electric pump 54 and the outdoor electric fan 55.

[Description of Components Other Than Above] Reference numeral 60 shown in FIG. 5 indicates a medium-concentration absorption liquid flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4, and a low-concentration absorption liquid flowing from the absorber 7 to the heating unit 2. Is a high-temperature heat exchanger for exchanging heat with and for cooling the medium-concentration absorbent flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4, and conversely heating the low-concentration absorbent flowing from the absorber 7 to the heating unit 2. is there. Reference numeral 61 shown in FIG. 5 is a low-temperature heat exchanger that exchanges heat between the high-concentration absorption liquid flowing from the low-temperature regenerator 4 to the absorber 7 and the low-concentration absorption liquid flowing from the absorber 7 to the heating unit 2. The high-concentration absorption liquid flowing from the low-temperature regenerator 4 to the absorber 7 is cooled, and conversely, the low-concentration absorption liquid flowing from the absorber 7 to the heating unit 2 is heated.

[Detailed Description of Heating Unit 2] Next, the heating unit 2
Will be described in detail with reference to FIGS. Heating part 2
As described above, includes the heating container 10 to which the low-concentration absorption liquid is supplied, and the combustion device 11 that heats the heating container 10 by the heat generated by the combustion of the gas.

[Explanation of the heating container 10]
A container with a substantially U-shaped cross section that covers the high temperature combustion gas generated by gas combustion in the combustion device 11 from above, and is made of stainless steel with excellent corrosion resistance.
Are connected. The annular tubular container part 70 of the heating container 10 has combustion gas flowing along the inner peripheral wall and the outer peripheral wall, and the inner peripheral wall surface of the annular cylindrical container part 70 has exhaust gas as shown in FIG. For the purpose of improving the heat exchange rate between the heating container 10 and the heating container 10, corrugated fins 71 made of a material having excellent thermal conductivity (for example, copper) are joined by joining means such as brazing. Further, as shown in FIGS. 3 and 4, a material having excellent heat conductivity (for example, copper) is also formed on the outer peripheral wall surface of the annular cylindrical container portion 70 for the purpose of improving the heat exchange rate between the exhaust gas and the heating container 10. The two corrugated fins 72, 73 made of) are joined to each other in upper and lower tiers with a pitch shifted from each other by joining means such as brazing.

The pipe drawn from the outside to the inside of the annular cylindrical container portion 70 is the low-concentration absorption liquid pipe 39, and the absorption liquid electric pump 40 extends from the bottom of the evaporation / absorption container 33 of the absorber 7.
It is for supplying the low-concentration absorption liquid into the heating container 10 via the.

[Description of Combustion Device 11]
A gas burner 74 that burns gas and this gas burner 7
4, a combustion blower 75 for sending combustion air to the exhaust gas 4, an intake passage 76 for sending the air flow generated by the combustion blower 75 to the gas burner 74, and exhaust gas generated by combustion in the gas burner 74 in contact with the heating container 10. It is composed of an exhaust passage 78 leading to the exhaust port 77.

The gas burner 74 shown in this embodiment is of the Bunsen type, and is formed by arranging a plurality of flattener bodies 79 in rows, each of which has a flame port for blowing gas upward and a primary air port for sucking primary air at the lower end. , The combustion air (indicated by white arrows in FIGS. 1 and 2) forcibly supplied from the combustion blower 75 through the intake passage 76 between the primary air ports and the flattener bodies 79, The gas blown out from each flame port of each flattener body 79 is burned. Then, the high-temperature exhaust gas generated by the combustion of the gas (indicated by the hatched arrow in FIGS. 1 and 2) is first blown toward the lower surface of the ceiling of the heating container 10, and then guided to the exhaust passage 78. The inner peripheral wall of the annular tubular container portion 70 → the lower surface wall of the annular tubular container portion 70 → the outer peripheral wall of the annular tubular container portion 70 is passed to be guided to the exhaust port 77. When the exhaust gas passes through the exhaust passage 78, the corrugated fins 71, 72, 7
3, the heating container 10 is heated by the heat of the exhaust gas, and as a result, the low temperature absorbing liquid in the heating container 10 is heated.

The combustion blower 75 uses, for example, a centrifugal blower to forcibly send the combustion air to the gas burner 74, and the air flow generated by the combustion blower 75 is passed through the intake passage 76. 74.

The intake passage 76 is provided with an annular intake passage 80 that covers the periphery of the exhaust passage 78, and sends combustion air from the combustion blower 75 through the annular intake passage 80 to the gas burner 74.

The exhaust passage 78 guides the exhaust gas blown to the lower surface of the ceiling of the heating container 10 from above to below the inner peripheral wall surface of the annular tubular container portion 70, and the inner peripheral annular passage 81. And an outer peripheral annular passage 82 that guides the exhaust gas guided downward to the upper side from the lower side of the outer peripheral wall surface of the annular tubular container portion 70 and guides it to the exhaust port 77. Then, as the exhaust gas flows from the inner peripheral annular passage 81 to the outer peripheral annular passage 82 to the exhaust port 77, the heat of the exhaust gas heats the annular tubular container portion 70.

[Description of Control Device 18] The control device 18 includes
Electric functions of the refrigeration cycle such as the solenoid valve 17, the solenoid opening / closing valve 32, the absorbing liquid electric pump 40, the cold / hot water electric pump 41, the cooling water electric pump 54, the indoor electric fan 42, and the outdoor electric fan 55. Parts and combustion device 11
Of the electric functional parts (in addition to the blower 75 for combustion, a gas control valve, an igniter, etc.) are energized and controlled according to the operation instruction of the controller manually set by the user and the input signal of each sensor type. is there.

As an example of each sensor, as shown in FIGS. 2 and 5, the heating container 10 is provided with a temperature sensor 90 for measuring the temperature of the low-concentration absorption liquid in the heating container 10. The temperature of the low-concentration absorption liquid detected by the temperature sensor 90 is used for adjusting the combustion amount of the gas burner 74, for detecting abnormal heating, and for the gas burner 7
4 is used to detect whether or not the temperature of the absorbing liquid in the heating container 10 has dropped below a predetermined temperature after the operation of No. 4 is stopped.

Even after the completion of the gas combustion in the gas burner 74, the control device 18 carries out the combustion operation of the gas burner 74 and the air conditioning of the room until the temperature of the absorbing liquid in the heating container 10 falls below a predetermined temperature. The other absorption refrigeration cycle apparatus 1 is operated in a state in which the cold / hot water electric pump 41 and the indoor electric fan 42 are stopped. That is, the control device 18 controls the combustion blower 75 and the absorption liquid electric pump 40 (in the pump of claim 2) until the temperature of the absorption liquid falls below the predetermined temperature even after the gas combustion in the gas burner 74 is completed. (Corresponding), and heat dissipation means 91 for operating the cooling tower 9 and the like.

In the present embodiment, the controller 18 detects whether or not the temperature of the absorbing liquid in the heating container 10 has fallen below a predetermined temperature during the heat radiation operation by the above temperature sensor 90, and the temperature sensor 90 When the temperature detected by 90 decreases to, for example, 100 ° C. or lower, it is determined that the heat radiation has been completed, and the entire operation of the absorption refrigeration cycle apparatus 1 is terminated.

Next, an example of the operation of the heat radiation means 91 provided in the control device 18 is shown in the flow chart of FIG. When an instruction to stop the air conditioning operation is given by the user operating the controller (start), the gas burner 7
4 is stopped, the cold / hot water electric pump 41 and the indoor electric fan 42 are stopped, and the combustion blower 75, the absorbing liquid electric pump 40, and the cooling water electric pump 54 of the cooling tower 9 are stopped. And an outdoor electric fan 55,
The other functional parts start the heat radiation operation in which they continue to operate (step S1). Then, it is judged whether or not the temperature detected by the temperature sensor 90 has dropped to 100 ° C. or lower (step S2). If the result of this determination is NO, the process returns to step S2, and if the result of the determination is YES, the operation of all the functional parts of the absorption refrigeration cycle apparatus 1 is stopped (step S3
),finish.

[Effects of the First Embodiment] In the present embodiment, even after the gas combustion in the gas burner 74 is completed after the air conditioning operation is completed, the air flow generated by the combustion blower 75 is generated by the intake passage 76 and the exhaust passage. Since the heating container 10 is forcedly cooled by flowing through 78, the heating container 10 can be cooled in a short time even if the heating container 10 is made of stainless steel having a poor heat dissipation property, and the absorption liquid does not crystallize at a predetermined temperature state. Can be reached quickly. In addition, the intake passage 76 and the exhaust passage 7
The heating part 2 other than the heating container 10 is forcibly cooled by the air flow flowing through the heating container 8, and the residual heat of the heating part 2 is radiated in a short time.

After the gas combustion of the gas burner 74 is finished, the electric blower 75 for combustion is operated and the electric pump 40 for absorbing liquid is operated. Therefore, the absorbing liquid whose temperature is relatively lowered in the absorbing section 7 is heated by the heating container 10. Since the heating container 10 is supplied to the inside of the combustion blower 75 as described above,
Heat is dissipated in a short time.

Further, after the gas combustion of the gas burner 74 is completed, the cooling tower 9 also operates, so that the absorber 7 is heated to the heating container 1
In order to keep the temperature of the absorbing liquid supplied to 0 low, the heating container 10 also radiates heat in a short time by operating the cooling tower 9 as well as operating the above-mentioned blower 75 for combustion and the electric pump 40 for absorbing liquid. To be done.

[Modification] In the above embodiment, the double-effect absorption refrigeration cycle device is shown as an example. However, a single-effect absorption refrigeration cycle device may be used, or a triple-effect multiple-effect absorption refrigeration cycle device may be used. Type absorption refrigeration cycle apparatus may be used. In the above-mentioned embodiment, when the medium-concentration absorbent is injected into the low temperature regenerator, it is injected from above the low temperature regenerator, but it may be injected from below. In the above embodiment, the absorption type refrigeration cycle device for performing indoor air conditioning is shown as an example, but it may be used for other purposes such as a refrigerator.

Although an example in which the heat exchanger for condensation, the heat exchanger for evaporation, and the heat exchanger for absorption are provided in the form of a coil has been shown, heat exchangers of other types such as tube-and-fin and laminated heat exchangers are shown. May be used. Although an aqueous lithium bromide solution has been shown as an example of the absorbing liquid, other absorbing liquids such as an ammonia aqueous solution using ammonia as a refrigerant and water as an absorbent may be used.

Although a combustion device that burns gas is shown as an example of the combustion device used in the heating unit, a combustion device that burns with liquid fuel may be used. Although the Bunsen type has been shown as an example of the gas burner, an all-primary type gas burner that burns an air-rich air-fuel mixture in which gas and combustion air are mixed may be used, or a gas-rich mixture in which gas and combustion air are mixed. A premixed Bunsen gas burner that burns the air-fuel mixture and supplies secondary air to the combustion section may be used. Although the gas burner of the above-mentioned embodiment shows an example in which a plurality of flattener bodies are provided in a row, another burner such as a ceramic burner may be used.

In the above-mentioned embodiment, an example in which the temperature of the absorbing liquid in the heating container is lowered to the predetermined temperature or lower is detected by the temperature detected by the temperature sensor is shown. Temperature is below a certain temperature (for example, below 80 ℃)
It is also possible to detect the temperature of the absorbing liquid in other parts by the temperature sensor, for example, by detecting that the temperature has decreased. Also, when the temperature of the absorbing liquid has dropped below a predetermined temperature, the temperature of the heating container is detected by a temperature sensor, and the temperature of other components is detected by the temperature sensor to indirectly detect the temperature of the absorbing liquid. You may. Furthermore, the fact that the temperature of the absorbing liquid has dropped below a predetermined temperature may be set by the time after the burner combustion operation is completed. In this case, the set time may be changed based on other physical data such as the outside air temperature.
The numerical values, shapes, arrangements, and the like shown in the embodiments are examples of the embodiments, and can be appropriately modified.

[Brief description of drawings]

FIG. 1 is a sectional view of a heating unit.

FIG. 2 is a cross-sectional view of a heating unit in a direction different from that of FIG.

FIG. 3 is an exploded perspective view of a heating container and a corrugated fin.

FIG. 4 is a perspective view of a heating container to which corrugated fins are joined.

FIG. 5 is a schematic configuration diagram of a double-effect absorption refrigeration cycle apparatus.

FIG. 6 is a flowchart showing the operation of the heat radiating means.

[Explanation of symbols]

 1 Absorption-type refrigeration cycle device 2 Heating part 3 High temperature regenerator 4 Low temperature regenerator 5 Condenser 6 Evaporator 7 Absorber 10 Heating container 11 Combustor 40 Pump for absorbing liquid (Pump of claim 2) 74 Gas burner 75 Combustion blower 90 Temperature sensor 91 Heat dissipation means

(72) Inventor Kaoru Kawamoto 4-1-2, Hirano-cho, Chuo-ku, Osaka, Osaka Gas Co., Ltd. (72) Toru Fukuchi 4-1-2, 1-2, Hirano-cho, Chuo-ku, Osaka Osaka Gas Co., Ltd. In the company

Claims (2)

[Claims] 1. A regenerator having a heating unit for heating the absorbing liquid, wherein the regenerating unit heats the absorbing liquid to vaporize a part of the absorbing liquid, and cools the vaporized refrigerant generated in the regenerator. In an absorption refrigeration cycle apparatus including a condenser that liquefies, an evaporator that evaporates the liquefied refrigerant liquefied by this condenser under low pressure, and an absorber that absorbs the vaporized refrigerant evaporated by this evaporator into an absorption liquid, The heating unit includes a heating container to which the absorbing liquid is supplied, a burner that burns fuel, and heats the heating container by the heat generated by burning the fuel to heat the absorbing liquid in the heating container. A combustion blower that sends combustion air to the burner is provided, and the absorption refrigeration cycle device has a temperature of the absorbing liquid that is lower than a predetermined temperature even after the fuel combustion in the burner is completed. Until, absorption refrigerating cycle apparatus characterized by comprising a heat dissipating means for driving the combustion fan. 2. An absorption type refrigeration cycle apparatus according to claim 1, further comprising a pump for supplying an absorption liquid from the absorber to the heating container, the pump terminating fuel combustion in the burner by the heat radiating means. An absorption type refrigeration cycle apparatus, which is operated even after the temperature of the absorbing liquid drops below a predetermined temperature.