JP3122282B2 - Absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator which is particularly suitable for use in summer when water saving is required.

[0002]

2. Description of the Related Art In a conventional absorption refrigerator, air-water cooling control for performing not only air cooling but also water cooling by watering is performed on the absorber in order to improve the capacity of the absorber. Water cooling control was performed over the entire combustion range of the burner.

[0003]

However, in this case, even when the cooling load of the indoor unit is reduced and the combustion amount of the burner is reduced, the air-water cooling control is performed uniformly, so that the amount of water used for watering increases. This causes inconvenience especially in summer, when water shortages are a problem.

[0004] In view of the above circumstances, the present invention provides an absorption chiller that can contribute to water saving particularly in summer by switching from air-water cooling control to air-only control when the cooling load of the indoor unit is reduced. The purpose is to do.

[0005]

That is, the present invention provides a regenerator (1) having a burner (2), an absorber (7), a condenser (3), and an evaporator (5). A cooling water pipe (30) for discharging cooling water to the absorber, and an air cooling device (21) for air-cooling the absorber, wherein the burner is provided in accordance with a cooling load of an indoor unit (28, 29). In the absorption refrigerator (23) for adjusting the combustion amount, a flow valve (31) is provided in the middle of the cooling water pipe, and when the combustion amount (Qn) of the burner is less than a predetermined critical combustion amount (Q2). A flow valve control means (19) for controlling the flow valve to close is provided.

The present invention also includes a regenerator (1) having a burner (2), an absorber (7), a condenser (3), and an evaporator (5). A cooling water pipe (30) for discharging cooling water to the water, and an air cooling device (2) for air cooling the absorber.
(1) an absorption chiller (23) that adjusts the combustion amount of the burner according to the cooling load of the indoor units (28, 29).
In the above, a temperature sensor (10) for detecting the outside air temperature is provided, and a flow valve (31) is provided in the middle of the cooling water pipe, and based on the outside air temperature detected by the temperature sensor,
Critical combustion amount (Q for switching from air-water cooling control to air-cooling control)
A critical combustion amount setting means (19) for setting 2) is provided, and the flow valve is closed when the combustion amount (Qn) of the burner is equal to or less than the critical combustion amount set by the critical combustion amount setting means. It is constituted by providing a flow valve control means (19) for controlling.

[0007]

With the above arrangement, the present invention provides a method for controlling the burner when the combustion amount (Qn) of the burner falls below the critical combustion amount (Q2).
The cooling water supply is stopped, and the air-cooling control is switched to the air-cooling control.

The present invention also relates to the critical combustion amount (Q2)
Acts so as to be appropriately set according to the outside air temperature.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of an absorption refrigerator according to the present invention, FIG. 2 is a flowchart showing an example of an air-water cooling control program, and FIG. 3 is a flowchart showing another example of an air-water cooling control program. is there.

The absorption refrigerator 23 according to the present invention has an outdoor unit 27 as shown in FIG.
It has a regenerator 1 provided with a burner 2 on the lower side. A condenser 3 communicating with the condenser 3 is disposed above the regenerator 1, and a refrigerant tank 6 is connected to the condenser 3 via a refrigerant pipe 4. An evaporator 5 is provided above the refrigerant tank 6, and an absorber 7 is provided on the left side of the evaporator 5 in FIG. The absorber 7 is provided with a U
A concentrated solution flow path 8 having a sealed pipe structure is connected, and a solution heat exchanger 9 is provided in the middle of the concentrated solution flow path 8. The concentrated solution flow path 8 is provided with a solution tank 12 via a vacuum valve 24. The solution tank 12 is connected to the regenerator 1 via a dilute solution pipe 13, and a pump 25 and the solution heat exchanger 9
Is provided. On the left side of FIG. 1 of the regenerator 1, a hot water heat exchanger 16 provided with a burner 17 is provided in a lower side, and an exhaust hood 18 is provided above the regenerator 1 and the hot water heat exchanger 16. Has been crowned. Further, a temperature sensor 1 for detecting an outside air temperature is provided below the hot water heat exchanger 16 in FIG.
0 is provided, and the temperature sensor 10 is connected to the control device 19.

A blower fan 21 is provided near the condenser 3 and the absorber 7 so as to cool the condenser 3 and the absorber 7. Further, a cooling water pipe 3 capable of discharging cooling water for cooling the absorber 7 with water is provided in the absorber 7.
0 is connected, and a flow valve 3 is provided in the middle of the cooling water pipe 30.
1 is provided.

On the other hand, a plurality (two in the figure, for example) of indoor units 28 and 29 are installed on the right side of the outdoor unit 27 in FIG. 1, and these indoor units 28 and 29, the evaporator 5 and the The cold water pipe 14 is connected to the hot water heat exchanger 16.

Since the absorption refrigerator 23 according to the present invention has the above-described configuration, during the cooling operation of the absorption refrigerator 23, first, the solution in the regenerator 1 boils due to the heating of the burner 2 and the refrigerant. After the vapor is led to the condenser 3, it condenses into a refrigerant liquid. This refrigerant liquid accumulates in the refrigerant tank 6, is supplied from the refrigerant pump 22 to the evaporator 5, and cools the chilled water flowing through the chilled water pipe 14 by the latent heat generated at the time of spraying. The solution tank 1 is absorbed as a diluted solution by absorbing a concentrated solution separately guided from the regenerator 1.
2 and return to the regenerator 1 to form a refrigeration cycle.

At this time, in the normal state, the absorber 7 performs air / water cooling control for simultaneously performing air cooling by the blower fan 21 and water cooling by cooling water from the cooling water pipe 30. When the cooling load at 29 is reduced, the water cooling control is stopped to save water, and only air cooling control is performed. That is, first, in step S1 of the air-water cooling control program PRG1 shown in FIG. 2, it is determined whether or not the flow valve flag is set. If the flow valve flag is not set, a predetermined amount of the refrigerant is stored in the refrigerant tank 6. Since a sufficient cooling effect cannot be expected because the refrigerant has not accumulated, the flow enters step S2, and the flow valve 31 is closed. On the other hand, if the flow valve flag is on, the process proceeds to step S3, where the current combustion amount Qn
Is a preset first critical combustion amount Q1 (a combustion amount at which air-cooling control is switched to air-water cooling control, for example, 6000 kcal)
If the current combustion amount Qn is equal to or greater than the first critical combustion amount Q1, the cooling load of the indoor units 28 and 29 is not small.
The air / water cooling control is continued with 1 open. On the other hand, if the current combustion amount Qn is less than the first critical combustion amount Q1, the process proceeds to step S5, where the current combustion amount Qn is changed to the second critical combustion amount Q2 (the combustion amount at which air-water cooling control is switched to air-cooling control. ,
For example, it is determined whether it is less than 5000 kcal). As a result, when the current combustion amount Qn is equal to or less than the second critical combustion amount Q2, the cooling load of the indoor units 28 and 29 is small and the indoor units 28 and 29 can be sufficiently cooled only by air cooling. The water cooling control is stopped by closing the valve 31, and only the air cooling control is performed. Further, when the current combustion amount Qn exceeds the second critical combustion amount Q2, the combustion amount is not significantly reduced as compared with the first critical combustion amount Q1, so the flow valve 31 is frequently turned on. Flow valve 3 to prevent
Leave 1 open.

The air / water cooling control program P shown in FIG.
In the air / water cooling control by RG1, the opening / closing operation of the flow valve 31 was performed based on the first and second critical combustion amounts Q1 and Q2 set independently of the outside air temperature. According to PRG2, it is possible to perform fine control according to the outside air temperature.

That is, first, in step S1 of the air-water cooling control program PRG2 shown in FIG. 3, it is determined whether or not the flow valve flag is set. Since a predetermined amount of refrigerant is not accumulated and a sufficient cooling effect cannot be expected, the flow enters step S2, and the flow valve 31 is closed. On the other hand, if the flow valve flag is on, the process proceeds to step S3, where the outside air temperature is detected by the temperature sensor 10, and the combination of the first critical combustion amount Q1 and the second critical combustion amount Q2 is determined based on the level of the outside air temperature. Set in four stages. That is, when the outside air temperature is less than 27 ° C.,
In step S4, Q1 = 6000 kcal, Q2 = 5500
If the outside air temperature is not less than 27 ° C. and less than 30 ° C., in step S5, Q1 = 5000 kcal and Q2 = 4
If the outside air temperature is not less than 30 ° C. and less than 34 ° C., in step S6, Q1 = 4000 kcal, Q
2 = 3500 kcal, and when the outside air temperature is 34 ° C. or higher, in step S7, Q1 = 3000 kcal and Q2 =
2500 kcal.

Next, at step S8, it is determined whether or not the current combustion amount Qn is equal to or greater than the first critical combustion amount Q1, and if the current combustion amount Qn is equal to or greater than the first critical combustion amount Q1, Since the cooling loads of the indoor units 28 and 29 are not small, the air / water cooling control is continued with the flow valve 31 opened in step S9. On the other hand, if the current combustion amount Qn is less than the first critical combustion amount Q1, the process proceeds to step S10, and it is determined whether the current combustion amount Qn is equal to or less than the second critical combustion amount Q2. As a result, when the current combustion amount Qn is equal to or less than the second critical combustion amount Q2, the cooling load of the indoor units 28 and 29 is small and the indoor units 28 and 29 can be sufficiently cooled only by air cooling. The water cooling control is stopped by closing the valve 31, and only the air cooling control is performed. If the current combustion amount Qn exceeds the second critical combustion amount Q2, the first
Since the combustion amount is not significantly reduced as compared with the critical combustion amount Q1, the flow valve 31 is kept open to prevent the flow valve 31 from frequently opening and closing.

[0019]

As described above, according to the present invention,
Regenerator 1 with burner 2, absorber 7, condenser 3
And a cooling water pipe 30 for discharging cooling water to the absorber 7, and an air cooling device such as a blower fan 21 for air cooling the absorber 7, for cooling the indoor units 28 and 29. In the absorption refrigerator 23 for adjusting the combustion amount of the burner 2 according to the load, a flow valve 31 is provided in the middle of the cooling water pipe 30.
And the combustion amount Qn of the burner 2 is equal to the second critical combustion amount Q
When the flow rate is equal to or less than a predetermined critical combustion amount such as
When the burner combustion amount Qn becomes equal to or less than the critical combustion amount, the supply of the cooling water is stopped and the air-water cooling is performed. By switching from control to air cooling control, it is possible to provide a water-saving absorption refrigerator.

Further, according to the present invention, the regenerator 1 having the burner 2, the absorber 7, the condenser 3, and the evaporator 5, and the cooling for discharging the cooling water to the absorber 7 A water pipe 30,
An air-cooling device such as a blower fan 21 for air-cooling the absorber 7 is provided, and an outside-air temperature is detected in an absorption refrigerator 23 that adjusts a combustion amount of the burner 2 according to a cooling load of the indoor units 28 and 29. A temperature sensor 10 is provided, and a flow valve 31 is provided in the middle of the cooling water pipe 30, and based on the outside air temperature detected by the temperature sensor 10, a second critical combustion amount Q2 or the like for switching from air-water cooling control to air-cooling control is provided. A critical combustion amount setting means such as a control device 19 for setting a critical combustion amount is provided, and when the combustion amount Qn of the burner 2 is equal to or less than the critical combustion amount set by the critical combustion amount setting means, the flow valve 31 is set. When the burner combustion amount Qn becomes less than the critical combustion amount, the supply of the cooling water is stopped and the air-water cooling is performed. It switched from your to air control, moreover since the critical combustion quantity is appropriately set according to the outside air temperature, it is possible to provide a water-saving absorption refrigerating machine that corresponds precisely to the outside air temperature.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of an absorption refrigerator according to the present invention.

FIG. 2 is a flowchart illustrating an example of an air-water cooling control program.

FIG. 3 is a flowchart showing another example of the air-water cooling control program.

[Description of Signs] 1 ... Regenerator 2 ... Burner 3 ... Condenser 5 ... Evaporator 7 ... Absorber 10 ... Temperature sensor 19 ... Critical combustion amount setting means, flow valve control means (control device) ) 21 Air cooling device (blowing fan) 23 Absorption refrigerator 28, 29 Indoor unit 30 Cooling water pipe 31 Flow valve Qn Burning amount of burner Q2 Critical combustion amount (second Critical combustion volume)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Tajima 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shozo Kato 2-18-3 Keihanhondori, Moriguchi-shi, Osaka (72) Inventor Yasuo Takase 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Tetsuo Miyamoto 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric (56) References JP-A-63-201458 (JP, A) JP-A-4-136667 (JP, A) JP-A-62-258974 (JP, A) JP-A-6-201213 (JP, A) A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 15/00 306

Claims (2)

(57) [Claims] 1. A cooling water pipe having a regenerator provided with a burner, an absorber, a condenser, and an evaporator, for discharging cooling water to the absorber, and an air cooling device for air cooling the absorber. An absorption refrigerator that adjusts a combustion amount of the burner according to a cooling load of an indoor unit, wherein a flow valve is provided in the middle of the cooling water pipe, and a combustion amount of the burner is equal to or less than a predetermined critical combustion amount. An absorption refrigerator comprising a flow valve control means for controlling the flow valve to close in such a case. 2. A cooling water pipe having a regenerator provided with a burner, an absorber, a condenser, and an evaporator, for discharging cooling water to the absorber, and an air cooling device for air cooling the absorber. An absorption refrigerator that adjusts a combustion amount of the burner according to a cooling load of an indoor unit. In the absorption refrigerator, a temperature sensor that detects an outside air temperature is provided, and a flow valve is provided in the cooling water pipe, and the temperature sensor is provided. Critical combustion amount setting means for setting a critical combustion amount for switching from air-water cooling control to air cooling control based on the outside air temperature detected in the step, wherein the combustion amount of the burner is set to the critical combustion amount set by the critical combustion amount setting means. An absorption refrigerator comprising a flow valve control means for controlling the flow valve to close when the flow rate is equal to or less than the flow rate.