JPH0777377A - Absorption type refrigerator - Google Patents

Abstract

PURPOSE:To improve convenient operability and to prevent putrefaction of food due to continuous defrosting by automatically finishing defrosting even if the defrosting is started by a defrost switch. CONSTITUTION:The absorption type refrigerator comprises a temperature sensor 3 and a defrosting switch 4 connected to an input of control means 27 such as a microcomputer, etc., having a timer 28 for measuring a defrosting time, and a control circuit 26 connected with drive means 6 for operating a heater 5 by an output of the means 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator, and more particularly to operation control thereof.

[0002]

2. Description of the Related Art A conventional operation control of an absorption refrigerator is disclosed in Japanese Patent Laid-Open No. 3-170763.

The conventional configuration will be described below with reference to the drawings. FIG. 5 is a block diagram of a conventional absorption refrigerator. In FIG. 5, reference numeral 1 is a control circuit, which is a control means 2 such as a microcomputer (hereinafter referred to as a microcomputer). A temperature detector 3 and a defrost switch 4 are connected to the input terminal of the control means 2. Driving means 6 for moving the heater 5 is connected to the output terminal of the control means 2.

FIG. 6 is a rear view of an absorption refrigerator having a control circuit having the above circuit configuration, and FIG. 7 is a sectional view of the absorption refrigerator.

In the figure, 7 is an absorption type refrigerator body, and a heat insulating material 10 is filled between an outer box 8 and an inner box 9.
The dew tray 1 is integrally formed on the upper back of the inner box 9.
There is one. A drain guide 13 is closely attached to the drain hole 12 of the dew tray 11, penetrates the inner box 9, the heat insulating material 10 and the outer box 8 and is connected to the drain hose 14 outside the refrigerator to be attached to the lower part of the outer box 8. It is introduced into the evaporating dish 16 which is in close contact with the provided high temperature and high pressure pipe 15. Reference numeral 17 denotes a cooling pipe, which is attached to the heat conducting plate 18 and is attached to the inner upper portion of the inner box 9.

The temperature detector 3 which detects the temperature inside the refrigerator and stops the operation of the heater 5 naturally melts the frost adhering to the cooling pipe 17 and the heat conduction plate 18 in the refrigerator during cooling. The defrosting switches 4 are provided inside the storage compartment.

The absorption type refrigeration cycle has a generator 19
The generator 19 is provided with a generator tube 20 and the heater 5 is installed therein. Further, a rectification pipe 21 and a condenser 22 are formed so as to be connected to the generation pipe 20, and the condenser 22 is provided with the cooling pipe 17 inside the refrigerator.

The cooling pipe 17 has a double-pipe structure so that hydrogen gas rises inside the internal pipe and liquid and gaseous ammonia and hydrogen gas fall outside the internal pipe. There is. The internal pipe communicates with the absorber 23, and the cooling pipe 17 communicates with the liquid reservoir 25 via the return pipe 24.

Further, the control circuit 1 constituting the above-mentioned circuit is attached to the back surface of the absorption refrigerator main body 7.

The operation of the control apparatus for the absorption refrigerator constructed as above will be described below with reference to the flowchart of FIG.

FIG. 8 is a flowchart showing the entire control program stored in the microcomputer 2. When the power is turned on, in step 100, all the data of the microcomputer 2 is cleared and initialization is performed. Next, in step 101, the state of the temperature detector 3 is read, and when the temperature inside the refrigerator of the absorption refrigerator main body 7 is higher than the set value, a signal is output to the driving means 6 to operate the heater 5 in step 102.

That is, the liquid reservoir 2 heated by the heater 5
The ammonia solution from 5 rises in the generation pipe 20, becomes a part of ammonia gas and flows into the rectification pipe 21 side, and becomes a part of diluted solution and flows into the absorber 23 side. The ammonia gas flowing into the condenser 22 from the rectification pipe 21 radiates heat here,
Liquefy.

Then, it descends into the cooling pipe 17, is mixed with hydrogen gas which has risen in the internal pipe of the cooling pipe 17 from the condenser 22, and while descending in the cooling pipe 17, heat is taken from the surroundings and vaporized. After that, it returns to the liquid reservoir 25 together with hydrogen gas.

In the absorber 23, the generating tube 20
The ammonia gas component is absorbed by the dilute solution from
A cycle is formed in which only the hydrogen gas rises to the internal pipe of the cooling pipe 17 to perform the cooling action.

Then, in step 103, the defrost switch 4
If is not operating, the process returns to step 101 and the same operation is repeated.

After that, if the inside of the refrigerator is cooled to a predetermined temperature, it is judged in step 101 that the temperature detector 3 is low, and in step 104, the signal of the driving means 6 is shut off to stop the heater 5. Therefore, ammonia gas is not generated and the cycle is stopped. After that, this action is repeated to perform a normal cooling action.

During such a cooling operation, when the defrost switch 4 is operated to remove the frost adhering to the cooling pipe 17 and the heat conduction plate 18 provided in the upper part of the inner box 9, step 1
From 03 to step 105, the signal of the driving means 6 is cut off to stop the heater 5, the cooling is stopped and the defrosting is performed.

During defrosting, the frost adhering to the cooling pipe 17 and the heat conducting plate 18 spontaneously melts and falls onto the dew tray 11 integrally formed in the upper part of the inner box 9. The defrosting water that has fallen to the dew tray 11 passes through the drain hole 12 of the dew tray 11 through the drain guide 13 and is connected to and attached to the drain hose 14 outside the refrigerator.
Be guided inside. The defrosting water collected in the evaporation tray 16 is naturally evaporated by the heat of the high temperature / high pressure pipe 15.

When defrosting is completed, if the defrosting switch 4 is stopped, the process returns from step 103 to step 101, and the cooling operation starts again.

[0020]

However, in the above-mentioned conventional configuration, the user has to manually stop the defrosting switch even if defrosting is started by the defrosting switch, which is not only inconvenient. However, if the user forgets to perform the defrosting process, the temperature inside the refrigerator has already risen and the food inside the refrigerator has spoiled when the user notices.

[0021] The present invention solves the conventional problem. Even when defrosting is started by the defrosting switch, the defrosting is automatically terminated to improve the usability and prevent the food from spoiling due to continuous defrosting. The purpose is to prevent.

[0022]

In order to achieve this object, the absorption refrigerator according to the present invention measures the defrosting time at the same time when the heater is stopped by the defrosting switch to start defrosting,
It is provided with a control circuit for ending the defrosting when a predetermined time or more is integrated.

[0023]

In the absorption refrigerator of the present invention, the defrosting is finished when the defrosting timer has accumulated a predetermined time or more, so that the usability is improved and the spoilage of the food due to the continuous defrosting can be prevented.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an absorption refrigerator according to the present invention will be described below with reference to the drawings. It should be noted that the same configurations as those of the conventional one are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a block diagram of the absorption refrigerator according to the present invention. In FIG. 1, reference numeral 26 is a control circuit, which is a control means 27 such as a microcomputer (hereinafter referred to as a microcomputer), and in the microcomputer 27, there is a timer 28 which starts measuring the defrosting time by the defrosting switch.

FIG. 2 is a rear view of an absorption refrigerator having a control circuit having the above circuit configuration, and FIG. 3 is a sectional view of the absorption refrigerator.

The control circuit 26, which constitutes the above-mentioned circuit, is attached to the rear surface of the absorption refrigerator main body 7.

The operation of the control apparatus for the absorption refrigerator constructed as above will be described below with reference to the flowchart of FIG.

FIG. 4 is a flowchart showing the entire control program stored in the microcomputer 27. When the power is turned on, in step 200, all the data of the microcomputer 27 is cleared and initialization is performed. Next, as step 201, the state of the temperature detector 3 is read,
When the internal temperature of the absorption refrigerator main body 7 is higher than the set value, the driving means 6 is operated to operate the heater 5 in step 202.
Output a signal to.

That is, the liquid reservoir 2 heated by the heater 5
The ammonia solution from 5 rises in the generation pipe 20, becomes a part of ammonia gas and flows into the rectification pipe 21 side, and becomes a part of diluted solution and flows into the absorber 23 side. The ammonia gas flowing into the condenser 22 from the rectification pipe 21 radiates heat here,
Liquefy.

Then, it descends into the cooling pipe 17, is mixed with the hydrogen gas rising from the condenser 22 in the internal pipe of the cooling pipe 17, and while descending in the cooling pipe 17, heat is taken from the surroundings and vaporized. After that, it returns to the liquid reservoir 25 together with hydrogen gas.

In the absorber 23, the generating tube 20
The ammonia gas component is absorbed by the dilute solution from
A cycle is formed in which only the hydrogen gas rises to the internal pipe of the cooling pipe 17 to perform the cooling action.

Then, in step 203, the defrost switch 4
Is not operating, the process returns to step 201 and the same operation is repeated.

After that, when the inside of the refrigerator is cooled to a predetermined temperature, it is judged in step 201 that the temperature detector 3 is low, and in step 204, the signal of the driving means 6 is cut off to stop the heater 5. Therefore, ammonia gas is not generated and the cycle is stopped. After that, this action is repeated to perform a normal cooling action.

When the defrosting switch 4 is operated to remove the frost adhering to the cooling pipe 17 and the heat conducting plate 18 provided in the inner upper portion of the inner box 9 during such a cooling operation, step 2
From 03 to step 204, the signal of the driving means 6 is cut off to stop the heater 5, the cooling is stopped and the defrosting is performed. During defrosting, the frost adhering to the cooling pipe 17 and the heat conduction plate 18 spontaneously melts and falls to the dew tray 11 integrally formed in the upper part of the inner box 9.

The defrosting water that has fallen to the dew tray 11 passes through the drain hole 12 of the dew tray 11 through the drain guide 13, is connected to the drain hose 14 outside the refrigerator, and is attached to the lower portion of the outer box 8. It is guided into the evaporation dish 16. The defrosting water collected in the evaporation tray 16 is naturally evaporated by the heat of the high temperature / high pressure pipe 15.

Next, in step 205, the defrosting time timer 28 is counted, and in step 206, the timer 28 is counted.
Is repeated from step 203 to step 206 until the time exceeds a predetermined time (for example, 2 hours or more), and the defrosting is continued. If the defrosting time timer 28 reaches a predetermined time or longer (for example, 2 hours or longer), the process returns from step 206 to step 201, and the cooling operation starts again.

Therefore, even if defrosting is started by the defrosting switch, the defrosting can be automatically terminated, the usability is improved, and the spoilage of food due to continuous defrosting can be prevented.

[0039]

As described above, the present invention has an absorption refrigeration cycle that is heated by a heater or the like to generate a refrigerant gas, and a temperature detector that detects the temperature inside the refrigerator and stops the operation of the heater. , The defrost switch is used to stop the heater and finish the defrost, and at the same time measure the defrost time,
Since it is an absorption-type refrigerator equipped with a control circuit that terminates defrosting when a predetermined time or more is integrated, the defrosting is automatically terminated even if defrosting is started by the defrosting switch. Not only does the troublesome operation such as having to stop the defrost switch manually be improved, but not only is the usability improved, but when the user forgets during defrost, the temperature inside the store has already risen and the food inside the store is spoiled. It can be prevented from being misused and is inexpensive and has a great effect.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an absorption refrigerator showing an embodiment of the present invention.

FIG. 2 is a rear view of the absorption refrigerator.

FIG. 3 is a sectional view of the absorption refrigerator.

FIG. 4 is a flowchart of the absorption refrigerator.

FIG. 5 is a control circuit diagram of an absorption refrigerator showing a conventional example.

FIG. 6 is a rear view of the absorption refrigerator.

FIG. 7 is a sectional view of the absorption refrigerator.

FIG. 8 is a flowchart of the absorption refrigerator.

[Explanation of symbols]

 3 Temperature Detector 4 Defrost Switch 5 Heater 7 Absorption Type Refrigerator Main Body 15 High Temperature and High Pressure Pipe 17 Cooling Pipe 18 Heat Conduction Plate 20 Generation Pipe 21 Sedimentation Pipe 22 Condenser 23 Absorber 24 Return Pipe 25 Liquid Pool 26 Control Circuit 27 Micro Computer 28 timer

Claims (1)

[Claims] 1. An absorption type refrigeration cycle that is heated by a heater or the like to generate a refrigerant gas, a temperature detector that detects the temperature inside the refrigerator and stops the operation of the heater, and a timer that measures the defrost time by a defrost switch. An absorption type refrigerator having a control circuit which has the defrosting switch, stops the heater to start defrosting, and ends the defrosting when the timer has accumulated a predetermined time or more.