JPH0424382Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field This invention is a refrigerator, in particular, a structure that cools a refrigerator by cooling brine, which is a heat medium, and circulating the brine through a heat exchanger inside the refrigerator. This relates to constant low temperature and high humidity refrigerators.

b. Conventional technology Brine-type constant temperature, high-humidity refrigerators usually control the temperature inside the refrigerator to maintain the freshness of fresh foods such as fish and shellfish, fresh vegetables, fruits, and meat. Controlling the brine temperature by controlling the refrigerator using a brine temperature detection device such as a temperature detection thermistor, and controlling the operation of the brine circulation pump using an internal temperature detection device for detecting the temperature inside the refrigerator. It is carried out by

In this case, the constant temperature inside the refrigerator is controlled by an internal temperature detection device, so it can be ensured sufficiently, but the control between the internal temperature and the brine temperature is not synchronized, and therefore, the pump operation Because there is no synchronization in the stop time and the stop time, the humidity inside the refrigerator fluctuates greatly, especially at high humidity, as will be explained later, and this can cause discoloration of fresh foods and premature drying of moisture, which can have a negative impact on maintaining freshness. Become.

In other words, the humidity inside the refrigerator is determined by the difference between the temperature of the heat exchanger inside the refrigerator and the temperature inside the refrigerator.As mentioned above, if the pump operation and stop times are not synchronized, the inside temperature will The difference between the temperature and the brine temperature (that is, the temperature of the heat exchanger inside the refrigerator) changes greatly during controlled operation, and the range of fluctuation in the humidity inside the refrigerator increases. As mentioned above, maintaining the freshness of perishable foods such as fish and shellfish, fresh vegetables, fruits, and meat requires a low constant temperature and high humidity inside the refrigerator. Also, especially in high humidity zones, fluctuations in humidity can cause food to discolor and dry out more quickly, adversely affecting the freshness of perishable foods. Therefore, it is even more ideal to further advance the conventional storage management at low constant temperature and high humidity to provide constant humidity and store at low constant temperature and high humidity.

Next, if we consider the operation of the refrigerator separately in winter and summer, we can see that when the outside temperature is low in winter, the amount of heat that enters the refrigerator from the outside is smaller than in summer, and therefore the fluctuation range of humidity is also small. It does not have much effect on maintaining the freshness of food.

However, in the summer, when the outside temperature is high, for example, the amount of heat entering the outside air into the refrigerator increases, causing the temperature inside the refrigerator to rise faster, making it impossible to synchronize with the brine temperature control described above.
This will increase the range of humidity fluctuations.

c Problems to be solved by this invention Therefore, the purpose of this invention is to provide a refrigerator that controls the inside of the refrigerator so that there is no fluctuation in humidity in a high humidity zone, especially in summer. It is an object of the present invention to provide a refrigerator in which the operation inside the refrigerator is controlled so as to eliminate such fluctuation range of humidity.

d Means for solving the problem According to this invention, an outside temperature detection device is installed to divide the outside temperature into high and low temperatures, and when the outside temperature is high, the brine pump is continuously operated to control the internal temperature. A refrigerator is provided in which a refrigerator or a compressor is controlled by a temperature detection device, and the internal temperature is controlled by brine temperature.

e Effect In the pump operation control according to this invention, the outside temperature detection device distinguishes between high and low temperatures, and when the outside temperature is high, the internal temperature is controlled and the brine circulation pump is operated continuously.
When configured to control using brine temperature, the brine temperature and the temperature inside the refrigerator are controlled synchronously, so the difference between the temperature of the heat exchanger inside the refrigerator and the temperature inside the refrigerator has almost a constant cycle, and the humidity The fluctuation range of is small,
This improves the freshness of the food.

In this case, the brine temperature during continuous operation of the pump when the outside temperature is high is set so that the internal temperature reaches the desired temperature value, and the brine temperature is set at this temperature even during operation when the outside temperature is low. control. However, when controlling the operation when the outside temperature is low, the temperature inside the refrigerator is controlled by controlling the pump with an inside temperature detection device, so the temperature inside the refrigerator changes between summer and winter. Never.

f. Example Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 shows a side sectional view of the refrigerator body. In FIG. 1, reference numeral 1 denotes a frame having a heat insulating material 2 and formed into a substantially box shape, and the inside of this frame 1 is a storage chamber 3. Further, a door 4 is attached to the front surface of the frame 1, and an opening 5 is provided on the upper surface, and a cooling unit 6 is attached to the opening 5. The cooling unit 6 is equipped with a compressor 7, a brine tank 8, a pump 9, a heat exchanger 10, an internal fan motor 11, and the like. The heat exchanger 10 and the internal fan motor 11 are located in the above-mentioned storage chamber 3, and a drain tray 12 is provided at the bottom of the heat exchanger 10, and a duct 13 is provided further below. It extends to the bottom of the back.

Next, cooling control of the storage chamber 3 will be explained using FIG. 2. FIG. 2 shows a configuration diagram of a refrigeration circuit for controlling the operation of a refrigerator. In the figure, a brine tank 8 contains brine 14, a freezer, a compressor 7, a condenser 1
5, a dryer 16, a capillary tube 17, a cooling pipe 15', and a condenser fan motor 18 in a refrigeration circuit configuration to cool the brine 14. The operation of the brine 14 is controlled by a brine thermistor 19 in the brine tank 8 . The cooled brine 14 is circulated by the pump 9 in the path of the arrow 20 through the heat exchanger 10, and the storage compartment 3 is cooled by operation of the internal fan motor 11.

Before explaining the operation of the refrigerator shown in FIGS. 1 and 2 according to this invention, the conventional control operation will be explained. FIG. 3 shows a conventional control circuit diagram for controlling the operation of the refrigeration circuit shown in FIG.
This is an electronic circuit that receives signals from the internal thermistor 22 shown in the figure and the brine thermistor 19 shown in FIG. 2, and outputs control signals based on these signals. also displays the internal temperature (not shown). Reference numeral 23 denotes a pump motor control relay, which is activated by a signal from the internal thermistor 22 and energizes the pump motor 9 when the normally open contact 23' is closed. 24 is a relay for controlling the refrigeration circuit, and a blind thermistor 19
When the normally open contact 24' closes due to the signal of
The refrigeration circuit also shown in FIG. 2 (also indicated generally at 25 in this FIG. 3) is energized.

With the above circuit configuration, first the internal thermistor 2
2 detects a change in the temperature inside the refrigerator, the electronic circuit 21 controls the operation of the pump motor 9 by controlling the pump motor control relay 23 on and off. Furthermore, when the brine thermistor 19 detects a change in the brine temperature, the electronic circuit 21 turns on and off the cooling circuit control relay 24 to control the operation of the cooling circuit 25. Control is performed to keep the temperature constant.

FIG. 5 shows a control operation performed by the control circuit shown in FIG. 3. Time is shown on the horizontal axis of FIG. 5, A' is the internal temperature, B' is the brine temperature, and C' is the humidity. As can be seen from this figure, especially in the summer, the brine temperature at B' is irregular due to internal load fluctuations and heat intrusion from outside, and therefore the humidity is also irregular, as shown in C'. It's under control.

Next, the control circuit according to this invention will be explained with reference to FIG. In this invention, as shown in FIG. 1, a thermostat 28 for detecting outside temperature is arranged around the cooling unit 6, and this thermostat 28 has a first contact 28a that closes at a predetermined temperature or higher.
and a second contact 28b that closes below the predetermined temperature. In FIG. 4, the first contact 28a is connected in series with the pump motor 9, and the second contact 28b is connected in series with the normally open contact 23' of the pump motor control relay 23. The other configurations in FIG. 4 are similar to those in FIG. 3, so their explanation will be omitted.

With the above configuration, when the outside temperature is higher than a predetermined temperature (for example, 25° C. or higher), the pump motor 9 operates continuously with the first contact 28a of the thermostat 28 conducting. When the outside temperature is lower than a predetermined temperature (for example, less than 25°C), the second contact 28b of the thermostat 28 becomes conductive, and the operation of the pump motor 9 is controlled by the pump motor control relay 2.
3 normally open contact 23', that is, the internal thermistor 2
It will be controlled by 2.

FIG. 6 shows how the control circuit shown in FIG. 4 performs controlled operation in summer.
As in Fig. 5, the vertical axis shows time, and A
shows the internal temperature, B shows the brine temperature, and C shows the humidity. As can be seen from FIG. 6, the use of the control circuit shown in FIG. 4 is optimal for maintaining and managing food freshness in the summer. In winter, as in the past, the pump motor 9 is controlled by the signal from the inside thermistor 22, so the control of the brine temperature and the temperature inside the refrigerator cannot be synchronized and become irregular. Because it is so small, the fluctuation range of humidity is almost eliminated.

g. Effects of the invention As described above, according to this invention, when the outside temperature is lower than a predetermined temperature, the temperature inside the refrigerator is controlled by the internal thermistor 22, and when the outside temperature is higher than the predetermined temperature, the pump motor 9 is operated continuously and the brine temperature is controlled. Since the internal temperature is controlled, the conventional drawbacks such as the lack of synchronization in controlling the brine temperature and the internal temperature, resulting in irregular humidity changes even in the summer, are completely eliminated.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing the refrigerator body, Figure 2 is a configuration diagram showing a cooling circuit for controlling the operation of the refrigerator, and Figure 3 is a conventional diagram for controlling the cooling circuit shown in Figure 2. 4 is a diagram showing a control circuit according to this invention for controlling the cooling circuit shown in FIG. 2, and FIG. 5 is a diagram showing a conventional control circuit shown in FIG. 3. FIG. 6 is a diagram for explaining the operation of the control circuit according to this invention shown in FIG. 4. In the figure, 3 is a storage room, 6 is a cooling unit, 7 is a compressor, 8 is a brine tank, 9 is a pump, 10 is a heat exchanger, 11 is an internal fan motor, 14 is a brine, and 19 is a brine thermistor (brine 21 is an electronic circuit, 22 is an internal thermistor, 23 is a pump motor control relay, 24 is a refrigeration circuit control relay, 25 is a refrigeration circuit, 26 is a normally open contact of the pump motor control relay, 27 28 is a normally open contact of a refrigeration circuit control relay, 28 is a thermostat for detecting outside temperature (outside temperature detecting device), 28a is a first contact, and 28b is a second contact.

Claims (1)

[Claims for Utility Model Registration] (1) The brine 14 as a heat medium is cooled by the refrigeration circuit 25, and the brine 14 is circulated by the pump 9 to the heat exchanger 10 provided in the refrigerator. The refrigerator includes: a brine temperature detection device 19 that detects the temperature of the brine 14 to control the operation of the refrigeration circuit 25; and a brine temperature detection device 19 that detects the temperature of the brine 14 to control the operation of the pump 9; An internal temperature detection device 22 installed in the refrigerator for detecting the outside temperature, and an outside temperature detection device 28 for detecting the outside temperature.
When the outside temperature is lower than a predetermined temperature, the operation of the pump 9 is controlled by a temperature detection signal from the internal temperature detection device 22, and when the outside temperature is higher than the predetermined temperature, the pump 9 is continuously operated. A refrigerator characterized in that it is made to operate and is equipped with the following. (2) The refrigerator according to claim 1, wherein the brine temperature detection device 19 is a thermistor. (3) The refrigerator according to claim 1 or 2, wherein the internal temperature detection device 22 is a thermistor. (4) The outside temperature detection device 28 has a first contact that closes when the temperature is higher than the predetermined temperature, and a second contact that closes when the temperature is lower than the predetermined temperature. The first claim for utility model registration, which is a thermostat installed
Refrigerator according to any one of paragraphs 3 to 3.