JPH0522779Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a constant temperature and high humidity refrigerator that uses brine as a cooling medium, and more specifically, the invention relates to a constant temperature and high humidity refrigerator that uses brine as a cooling medium. , relates to a constant temperature and high humidity refrigerator that makes it possible to improve heat exchange efficiency.

Conventional technology Fresh foods such as vegetables, fruits, meat, and fish (hereinafter referred to as "ingredients") are stored frozen for a long period of time,
When gradually thawing frozen food, it is generally necessary to keep temperature changes within the refrigerator to a minimum and to control moisture evaporation from the food. In order to meet this demand, brine cooling type refrigerators that use antifreeze (hereinafter referred to as "brine") as a cooling medium have been put into practical use.

An example of a refrigerator using this brine is
As shown in the figure. In this refrigerator, a cooler 2 is disposed in a storage 1a defined inside a box 1, and brine is circulated and supplied into the cooler 2 through a route described below. Also, a cooling unit section 3 is installed adjacent to the storage compartment 1a.
A refrigeration system 10 comprising a compressor 4, a condenser 5, a dryer 6, a capillary tube 7, an accumulator 8, a suction pipe 9, etc. is disposed in the cooling unit section 3. A brine tank designated by reference numeral 11 is a container for storing brine 12 at a predetermined level, and is provided at the bottom of this tank 11 and has an evaporator 13 connected to the refrigeration device 10.
Accordingly, the brine 12 is forcedly cooled.

Brine 1 cooled in brine tank 11
2 is supplied to the cooler 2 via the illustrated circulation pump 14 and supply pipe 15, and after cooling the refrigerator air in the cooler 2, the air is returned to the tank 11 again via the return pipe 16. Repeat the circular cycle.

In this way, refrigerators that use brine as a cooling medium can circulate a large amount of brine, which has a high specific heat, compared to ordinary refrigerators that use fluorocarbon gas as a cooling medium, so they can have a large cooling capacity. Suitable for cold storage of ingredients. Moreover, since it is possible to reduce the difference between the surface temperature of the cooler placed inside the refrigerator and the temperature inside the refrigerator, moisture in the air inside the refrigerator is suppressed from adhering as frost on the surface of the cooler, creating a high humidity inside the refrigerator. can be held.

Problems to be Solved by the Invention In the above-mentioned constant temperature and high humidity refrigerator, a cooling duct 35 whose lower part is open and whose upper part is sealed is disposed inside the storage 1a, and this duct 35 covers the cooler 2 in a non-contact manner. It's on. An opening 36 is formed in the cooling duct 35, and a blowing fan F ₀ driven by a motor FM ₀ faces the opening 36 . The air inside the storage 1a (hereinafter referred to as "inside air") is sucked from below the cooling duct 35 by the blower fan _F0 , contacts the cooler 2, and is cooled by exchanging heat. Thereafter, it is blown out from the opening 36 and circulated as shown by the arrow, cooling the entire interior of the refrigerator.

In such a constant temperature and high humidity refrigerator, when the blower fan is operated, the air comes into contact with the cooler 2, thereby promoting heat exchange. However, it is known that the wind from the fan is blown only onto a certain surface of the cooler 2, which causes so-called "uneven wind". In this way, when wind is blown only onto a certain surface of the cooler 2, frost buildup progresses only on that surface portion of the cooler 2, and the critical heat exchange efficiency is reduced. Therefore, it has been pointed out that the cooling time becomes longer and the humidity contained in the air inside the refrigerator decreases due to the frost formation, making it impossible to maintain high humidity inside the refrigerator.

Further, there is a constant temperature/humidity refrigerator that has a configuration in which a plurality of blower fans are disposed close to the cooler, and the plurality of blower fans promote heat exchange between the air inside the refrigerator and the cooler. Even in such a constant temperature and high humidity refrigerator, if one of the blower fans is out of operation for a long time, the air will be blown unevenly onto the surface of the cooler.
As a result, non-uniform frost formation develops, causing the same problems as described above.

Purpose of the invention This invention was proposed in view of the above-mentioned problems inherent in conventional constant temperature and high humidity refrigerators, and was proposed to suitably solve these problems. It is an object of the present invention to provide a constant temperature and high humidity refrigerator that can improve heat exchange efficiency by evening out frost on the surface.

Means for Solving the Problems In order to overcome the above-mentioned problems and also achieve the intended purpose, the present invention provides a box body defining a storage space for cooling and storing foodstuffs inside, and a storage space for this storage space. a unit section that is disposed adjacent to the refrigeration system and includes a refrigeration system consisting of a refrigeration system such as a refrigerant compressor and a condenser, and a brine tank that houses an evaporator connected to the refrigeration system and stores brine therein; A cooler that cools the inside of the storage by circulating brine in the brine tank, and a plurality of fans that are arranged close to the cooler and force the air inside the storage into contact with the cooler. A constant temperature and high humidity refrigerator includes a cooling duct that is disposed in the storage compartment, covers the cooler in a non-contact manner, and is sealed at the top and open at the bottom; a partition plate dividing the room into rooms; a plurality of openings opened in the cooling duct and correspondingly communicating with the plurality of independent chambers; and a plurality of openings arranged correspondingly to the plurality of openings and selectively operable. and an electric control means for operating only a part of the plurality of fans and sequentially switching the part of the fans to be operated when the temperature inside the refrigerator is below the upper limit temperature setting, and this electric control means By selectively operating individual fans using means, internal air is circulated to the side of the cooler facing the independent room where the operating fan is located, and frost formation in the cooler is averaged out. It is characterized by being configured to make it possible to

Embodiments Next, preferred embodiments of the constant temperature/humidity refrigerator according to the present invention will be described below with reference to the accompanying drawings. Note that the same members as those already described with reference to FIG. 9 are designated by the same reference numerals.

FIG. 1 shows a cooling system of a horizontal constant temperature and humidity refrigerator in which the present invention is preferably implemented, which is basically the same as the cooling system described above with respect to FIG. In other words, inside the horizontally long box 1 constituting this refrigerator, there is a storage compartment 1a for cooling and storing foodstuffs.
is defined, and a heat insulating material 1b is filled between the box 1 and the storage 1a. Further, a cooling unit 3 is arranged adjacent to the box body 1, and this cooling unit 3
The refrigeration system 10 housed inside is composed of equipment such as a compressor 4, a condenser 5, a dryer 6, a solenoid valve V ₁ , a capillary reach tube 7, an evaporator 13, an accumulator 8, and a suction pipe 9.

A brine tank 11 is disposed in the unit part 3, and as shown in FIG. A heat insulating material 21 is filled between the bodies. The rectangular opening at the top of the tank 11 is removably covered by a lid body 25 formed by interposing a heat insulating material 24 between an upper lid 22 and an inner lid 23. The four edges of the top cover 22 are bent at right angles, and fit into the outer box 19 of the tank 11.
The upper edge portion 26 of the tank and the inner lid 23 are in close contact with each other. Further, the bent end portion of the upper lid 22 is fixed to the tank outer box 19 via bolts 27.

One end of a suction pipe 17 is connected to the lower side wall of the tank inner box 20, with its opening facing the tank 11, and the other end connected to a pump 14 for brine circulation. A discharge pipe 18 communicating with the discharge side of the circulation pump 14 communicates with a supply pipe 15 connected to the cooler 2 inside the refrigerator. Further, a discharge pipe 28 is provided at the upper side wall of the inner box 20 (above the suction pipe 17), and is bent into a key shape and opens downward.The other end of the discharge pipe 28 is connected to a return pipe 29. are doing. Note that the discharge pipes 18 and 28, the return pipe 29, and the suction pipe 17 are covered with a heat insulating hose 30.

An L-shaped support plate 31 is fixed to the bottom 11a of the tank 11 via bolts 32, and the evaporator 13 is wound around the support plate 31 in a coiled manner, and the brine 12 stored in the tank 11 is is designed to cool down to the required temperature. Further, the bolt penetration portion drilled in the bottom portion 11a is sealed by a screw receiver 33 adhered to the back surface of the bottom portion to prevent external leakage of brine. The outlet pipe 13b of the evaporator 13 is arranged so as to be oriented obliquely upward, one end of the accumulator 8 is connected to the outlet pipe 13b, and the other end is connected to a suction pipe led out from the refrigeration device 10. 9 is connected. That is, the accumulator 8 is
The coiled evaporator 13 is immersed in the brine 12, and the coiled evaporator 13 is immersed in the brine 12. It will be immersed.

The accumulator 8 is provided to prevent liquefied refrigerant that has not been completely evaporated from being directly sucked into the compressor 4 and flowing into the cylinder, causing damage to the internal valve structure, etc. , has a volume as a liquid reservoir, and performs suitable gas-liquid separation of the refrigerant flowing in in a gas-liquid mixed phase state, so that only the gas-phase refrigerant is sucked into the compressor 4.

Returning to FIG. 1, a cooler 2 to which the brine 12 is circulated and supplied is provided on the inner right side wall of the storage 1a.
is fixedly placed. As this cooler 2,
Preferably, a fin and tube type is adopted. A defrosting thermometer Th ₂ for detecting the end of defrosting and a heater H for promoting defrosting are arranged near the cooler 2, and a dew pan 37 is arranged below the cooler 2. Water droplets dripping from the cooler 2 during frost can be collected and discharged outside the refrigerator. Further, as shown in the figure, a cooling duct 35 whose lower part is open and whose upper part is sealed is provided to cover the cooler 2 in a non-contact manner.

FIG. 3 is a cross-sectional view of FIG. 1 taken along the - line direction, and the cooling duct 35 in this embodiment has two circular openings 36a and 36b. Blow fans F ₁ and F ₂ are disposed in these openings 36a and 36b, respectively, and
Each of the blowing fans F ₁ and F ₂ is rotationally driven by correspondingly provided fan motors FM ₁ and FM ₂ . The blower fans F ₁ and F ₂ are each independently defined by a partition plate 40 disposed above the inside of the cooling duct 35 .
The air inside the refrigerator that is sucked in from below contacts the cooler 2 and is cooled by heat exchange, and then is divided into two parts by the respective blower fans F ₁ and F ₂ , and is divided into two by the openings 36 a,
It is blown out from 36b, circulates as shown by the arrow, and cools the entire interior of the refrigerator. Here, both blower fans F ₁ ,
The total air volume obtained from F ₂ is preferably set to be equal to the single air volume of the conventional blower fan F ₀ described above. In other words, by driving both fan motors FM ₁ and FM ₂ , both blower fans F ₁ and F ₂
When the refrigerator is rotated, the amount of circulating air in the refrigerator increases, the heat exchange rate with the cooler 2 is increased, and the interior of the refrigerator can be cooled in a short time.

In this way, instead of providing one large-sized ventilation fan for the single cooler 2, multiple small-sized ventilation fans F ₁ , F _{2 .} . . are provided,
Since the diameter of each fan is small, the storage part of the cooler 2 can be made thinner, and there is a design advantage that the protrusion into the refrigerator can be reduced and the area inside the refrigerator can be used widely and effectively.

Furthermore, when a single large-sized blower fan is used, there is little flow of air in the refrigerator near the four corners of the cooler 2 due to the fan, and this area is not utilized effectively. However, by using a plurality of small-sized blowing fans, the fans can be arranged so that the air inside the refrigerator can be circulated almost throughout the cooler 2, and an effect of improving the heat exchange rate can also be obtained.

Next, the internal thermostat Th ₁ is placed at the appropriate location inside the refrigerator.
(Fig. 1) shows two electrical contacts Th ₁ -a, Th ₁ -
b. This electrical contact Th ₁ -a is closed only while the internal temperature T falls to the lower limit set temperature T _{0 and} only while the internal temperature T rises to the upper limit set temperature T ₁ (T ₀ < T ₁ ). Open. Also, the electrical contact Th ₁ −
b is closed only while the internal temperature T falls to the lower limit set temperature T ₀ , and the abnormal set temperature T ₂ (T ₀
<T ₁ <T ₂ ).

In the refrigeration pipe system and brine circulation pipe system shown in FIG. 1, the vaporized refrigerant compressed by the compressor 4 is condensed and liquefied in the condenser 5, dehumidified in the dryer 6, and then passed through the solenoid valve _V1 . pass through. Next, the liquefied refrigerant is depressurized to a required value by a capillary reach tube 7 as a decompression means, evaporated in an evaporator 13 disposed in the brine tank 11, and exchanges heat with the brine 12. Cooling. The vapor phase refrigerant that has evaporated and the liquid phase refrigerant that has not been completely evaporated in the evaporator 13 flows into the accumulator 8 in a gas-liquid mixed phase state, where they are separated into the gas phase refrigerant and the liquid phase refrigerant. . Then, the gas phase refrigerant returns to the compressor 4 via the suction pipe 9, and the liquid phase refrigerant is stored in the accumulator 8.
Note that the symbol FM ₃ in the figure indicates a fan motor for the condenser 5.

Next, to explain the brine circulation circuit, the brine 12 stored in the brine tank 11 is
It is cooled to a required temperature by a cooler 13 connected to the refrigeration device 10, sucked out by a circulation pump 14 through a suction pipe 17 led out from the tank 11, and then passed through a discharge pipe 18 and a supply pipe 15. It is supplied to the cooler 2 inside the warehouse. After exchanging heat with the air inside the refrigerator in the cooler 2, the return pipe 1
6, returns to the brine tank 11 via a key-shaped discharge pipe 28.

FIG. 4 shows the electric control circuit of the refrigerator according to this embodiment. In the figure, a cam timer TM is connected between power supply lines A and B, and this cam timer TM
The movable contact c provided on the power supply line B side is connected to the fixed contact a side during the cooling cycle and switched to the fixed contact b side during the defrosting cycle by the timer drive motor M. There is. The power supply line A and the connection point K are connected by the contact Th ₁ -a of the thermostat Th ₁ , and the compressor CM4, the counter C, and the fan motor FM ₃ are connected between the connection point K and the fixed contact a. and solenoid valve V ₁ are connected in parallel. The solenoid valve _V1 is configured to open when energized to open the piping system, and close to shut off the piping system when de-energized.

Counter C takes as an input signal a signal generated by the opening and closing operations of contact Th ₁ -a of thermometer Th ₁ , and turns on (closes) counter contacts C ₁₁ and C ₁₂ , which will be described later, every time the input signal is received. )/off (open). The counter contacts C ₁₁ and C ₁₂ are controlled so that when one is on, the other is off, as shown in FIG.

Between the power supply line A and the contact a of the Cam TimerTM, the counter contact _C11 and the thermo contact are connected.
Fan motor connected in parallel circuit with Th ₁ -b
FM ₁ and said counter contact C ₁₂ and thermo contact
Fan motor connected in parallel circuit with Th ₁ -b
FM ₂ and pump motor PM are connected in parallel. Furthermore, power supply line A and cam timer TM
The defrosting thermometer connected in series is connected between fixed contact b of
The defrosting thermometer Th ₂ is connected to the heater H, and the defrosting thermometer Th ₂ is closed when the temperature of the cooler 2 falls below a predetermined value.

Next, the actual operation of the constant temperature and high humidity refrigerator according to this embodiment will be explained with reference to the timing chart shown in FIG.

Prior to operation of the constant temperature/humidity refrigerator, first remove the lid 25 of the brine tank 11 and inject the brine 12. This is the sum of the amount in which the digits are stored. After finishing the brine injection, the lid 25 is reattached.

When the power switch is turned on, contacts a and c of the cam timer TM are connected and the cooling cycle begins. At this time, the internal temperature T is high, so
The contact Th _{1 -a} of the internal thermostat Th 1 is in a closed state, so the solenoid valve V ₁ is opened to establish communication between the dryer 6 and the capillary reach tube 7 of the refrigeration system 10, and the compressor 4 Then, the condenser fan motor FM ₃ is started and the operation of the refrigeration system is started.
In addition, the brine circulation pump 14 rotates, and the brine 12 in the tank 11 is sucked through the suction pipe 17 and supplied to the cooler 2 via the discharge pipe 18 and the supply pipe 15.

The brine 12, which has been pressure-fed by the pump 14 and passed through the cooler 2, exchanges heat with the air inside the warehouse, and then flows from the discharge pipe 28 through the return pipe 16 to the tank 1.
Return within 1. The returned brine 12 is in tank 1
1 with the cooled stored brine 12 by the evaporator 13, and is again circulated by the pump 14 via the suction pipe 17. On the other hand, the internal thermostat
The other contact Th ₁ -b of Th ₁ is closed, and both fan motors FM ₁ and FM ₂ rotate, forcing the air inside the refrigerator into contact with the cooler 2 to perform heat exchange. After that, it is further circulated inside the refrigerator. By repeating this process, the internal temperature gradually decreases.

The temperature inside the refrigerator drops and the temperature rises due to the temperature inside the refrigerator.
When the lower limit set temperature T ₀ of Th ₁ is reached, the internal thermostat
Contact Th ₁ -a of Th ₁ opens, compressor 4 and fan motor FM ₃ stop, and solenoid valve V ₁ closes.
Note that the counter C is supplied with power from another system (not shown) and continues to operate as a counter.
Further, the other contact Th ₁ -b of the internal thermostat Th ₁ is also opened when the internal temperature T reaches the lower limit set temperature T ₀ .
At this time, the signal generated by the opening operation of contact Th ₁ -a is input to counter C, and the counter
_C11 turns on and counter _C12 turns off.
As a result, fan motor FM ₁ continues to rotate, but fan motor FM ₂ stops rotating. Therefore, the amount of heat generated from the fan motor and the amount of circulating air in the refrigerator are halved. In this way, the circulation amount of air inside the refrigerator is halved, but since the inside of the refrigerator has already been cooled to the lower limit temperature T ₀ of the internal thermometer Th ₁ , it is sufficient to have enough air volume to maintain the temperature inside the refrigerator. be. Since the pump 14 continues to operate, the brine 12 in the tank 11 continues to circulate in the pipeline system, continues to exchange heat with the air inside the warehouse circulated by the blower fan _F1 , and continue to cool.

The temperature T inside the refrigerator increases over time due to heat entering from outside the refrigerator, heat generated by the fan motor FM ₁ , etc., and the temperature of the brine 12 that exchanges heat with the air inside the refrigerator also increases. When the internal temperature T rises to the upper limit set temperature T ₁ of the internal thermostat Th ₁ , the internal thermostat Th 1
The contact Th ₁ -a of Th ₁ is closed, the compressor 4 and the fan motor FM ₃ are started in the same way as described above, and the solenoid valve V ₁ is opened, and the cooling operation of the refrigeration system 10 is restarted. .

Then, a signal generated by the closing operation of the contact Th ₁ -a is input to the counter C, and the counter C ₁₁ is turned off and the counter C ₁₂ is turned on. This causes fan motor FM ₁ to stop rotating and another fan motor FM ₂ to start rotating. Therefore, the flow of the air inside the refrigerator that passes through the cooler 2 flows on the other half side of the cooler 2. Also fan motor
Cooler 2 when only FM ₁ was rotating
Air inside the refrigerator will no longer flow to the half side. The reason why the cooler 2 is divided into approximately two equal parts in this manner and the air inside the refrigerator is circulated alternately on each side is to even out the frost buildup on the cooler 2. In other words, when the moisture contained in the circulating air inside the refrigerator comes into contact with the surface of the cooler 2, if the temperature inside the refrigerator is set to 0°C or below, the surface temperature of the cooler 2 will also drop to 0°C. As the temperature drops below, dew condenses and frost forms. Therefore, if the inside of the refrigerator is continuously cooled using only one side of the cooler 2,
Frost builds up only on one side, and the frost covering the surface of one side of the cooler 2 in a layer prevents heat exchange with the air inside the refrigerator, reducing the cooling efficiency inside the refrigerator and causing the operation of the refrigeration system 10. It takes a long time and wastes electricity.
Furthermore, unless the difference between the temperature of the brine 12 and the temperature inside the refrigerator is increased, the temperature inside the refrigerator cannot be maintained at the set temperature, and as the temperature of the cooler 2 decreases, the amount of frost will increase, causing high humidity inside the refrigerator. It becomes impossible to keep it. Therefore, as mentioned above, the fan motors FM ₁ and FM ₂ are operated alternately to uniformly form frost over the entire surface of the cooler 2, thereby solving the above-mentioned problem and lowering the operating rate of the compressor. This suppresses the increase in power consumption and maintains high humidity inside the refrigerator.

In this embodiment, only the fan motor FM ₁ is rotated while the temperature inside the refrigerator rises from the lower limit set temperature T ₀ of the refrigerator interior thermometer Th ₁ to the upper limit set temperature T ₁ , and the lower limit temperature is set from the upper limit set temperature T ₁ . Although only the fan motor FM ₂ is rotated while the temperature inside the refrigerator falls to temperature T ₀ , it may be alternately rotated by other methods. For example, irrespective of whether the internal temperature T is above or below, it may be switched at regular intervals using a timer or the like.

By repeating the above cycle, the internal temperature is maintained between the upper limit set temperature T ₁ and the lower limit set temperature T ₀ .

Next, when the refrigerator enters the defrosting cycle, the connection of the movable contact c of the Cam Timer TM is switched to the fixed contact b side. At this time, the temperature of the cooler 2 has become sufficiently low, so the thermostat _Th2 is in a closed state. Therefore, power supply to the heater H is started, and defrosting is performed. When defrosting is completed, thermometer _Th2 detects this and enters the open state, cutting off the power supply to heater H. Thereafter, when the defrosting cycle ends and the connection of the cam timer TM is switched to the side between contacts a and c, the above-mentioned cooling cycle is started again.

In the cooling cycle described above, the refrigeration device 10
The reason why the solenoid valve _V1 was closed and the inlet side piping of the capillary reach tube 7 was shut off when the engine stopped was as follows. That is, without the solenoid valve V ₁ , when the refrigeration system 10 is stopped, the high-pressure refrigerant on the discharge side of the compressor 4 will pass through the capillary reach tube 7 and reach the evaporator 1 .
The refrigerant flows into the accumulator 8 from the refrigerant 3, and the pressure within the accumulator 8 increases in a short period of time. Then, the evaporation temperature of the refrigerant in the accumulator 8 becomes high, and the effect of removing the heat of vaporization from the brine 12 is reduced. Therefore, a solenoid valve _V1 is provided and is closed at the same time as the refrigeration system 10 is stopped. Also, in the event of a power outage, solenoid valve V ₁ closes, so
This prevents failures in the compressor 4 and the like. In other words, the refrigerant on the high pressure side condenses in the accumulator 8, which is connected to the evaporator 13 via the capillary reach tube 7, and becomes liquid phase refrigerant, which is stored in large quantities.Moreover, when the operation is resumed, this large amount of liquid phase refrigerant passes through the suction pipe 9. It is possible to effectively prevent the liquid from passing through and being sucked into the compressor 4 and causing failures such as valve cracks due to liquid compression. However, it goes without saying that the present invention can also be applied to those without the solenoid valve _V1 .

At the end of defrosting, if the temperature inside the refrigerator T is higher than the abnormal setting temperature _T2 , as shown in the timing chart of Fig. 6, the inside thermometer _Th1
Since the contact Th ₁ -b of is closed, the fan motors FM ₁ and FM ₂ both rotate at the same time as the cooling cycle begins. Therefore, the amount of circulating air in the refrigerator increases, and the amount of heat exchanged with the cooler 2 also increases, so that the temperature can be cooled down to the lower limit set temperature T ₀ in a short time.

You can also open the door during the cooling cycle,
It is generally known that when food items that have reached room temperature or higher are added, the temperature inside the refrigerator will rise rapidly. However, from point L shown in Figure 6, the temperature inside the refrigerator T suddenly rises and the set temperature becomes abnormal.
After passing through T ₂ , the contact Th ₁ -b of the internal thermostat Th ₁
is closed, both the fan motors FM ₁ and FM ₂ rotate, and the temperature inside the refrigerator can be cooled down from point J to the lower limit set temperature T ₀ in a short period of time in the same manner as described above. Although the present embodiment has been described with respect to a configuration in which one brine circulation circuit system is provided, it is of course applicable to a refrigerator having a plurality of brine circulation circuit systems. Further, the present invention is applicable not only to a refrigerator in which a refrigeration device is disposed adjacent to a storage, but also to a so-called separate type refrigerator in which a supply pipe and a return pipe are connected via a hose or the like. Further, the shape of the storage is not limited to horizontal, but may be vertical or other shapes. Furthermore, the present invention can be suitably applied to a refrigerator in which an auxiliary cooler for circulating refrigerant from a refrigeration system is provided inside the refrigerator. Alternatively, the cooler may be divided into two separate structures, and each may be provided with a fan motor.

FIG. 7 shows an electrical control circuit diagram according to a second embodiment of the present invention. In this second embodiment, a cam timer TM is connected between power supply lines A and B.
is connected, and the movable contact c provided on the power supply line B side of the Cam Timer TM is connected to the fixed contact a side during the cooling cycle and to the fixed contact b side during the defrosting cycle by the timer drive motor M. It is now possible to switch to The power supply line A and the connection point K are connected by a contact Th ₁ -a of a thermometer Th ₁ , and a compressor CM4, a fan motor FM ₃ and a solenoid valve V are connected between the connection point K and the fixed connection a. ₁ are connected in parallel. Two contacts of Thermo Th ₁
Th ₁ -a and Th ₁ -b are opened until the internal temperature T rises and exceeds a predetermined upper limit value T ₁ , and are closed when the temperature exceeds the predetermined upper limit value T ₁ . In addition, the internal temperature T decreases to a predetermined lower limit T ₀ (T ₀ <
It is closed until the temperature drops below T ₁ ), and opens when it falls below a predetermined lower limit. Further, the solenoid valve _V1 is configured to open when energized to open the piping system, and close when de-energized to shut off the piping system. Further, between the power supply line A and the fixed contact a, there is a pump motor PM and a fan motor connected via the contact _Th1 -b of the internal thermostat _Th1 .
FM ₁ and fan motor FM ₂ are connected in parallel. The power supply line A and the fixed contact b are connected by a defrosting thermometer Th ₂ and a heater H connected in series. This defrosting thermometer _Th2 is closed when the temperature of the cooler 2 falls below a predetermined value.

Next, the actual operation of the constant temperature and high humidity refrigerator according to this embodiment will be explained with reference to the timing chart shown in FIG. When the power switch is turned on, contacts a and c of the cam timer TM are connected, and the cooling cycle begins. At this time, the internal temperature T is high, so the contact Th _{1 -a} of the internal thermostat Th 1 is closed, and the solenoid valve V ₁ is opened.
The dryer 6 and the capillary reach tube 7 of the refrigeration system 10 are communicated with each other, and the compressor 4 and the condenser fan motor FM ₃ are activated to start the operation of the refrigeration system. Also, pump 1 for brine circulation.
4 rotates, and the brine 12 in the tank 11 is sucked in through the suction pipe 17 and supplied to the cooler 2 via the discharge pipe 18 and the supply pipe 15.

The brine 12, which has been pressure-fed by the pump 14 and passed through the cooler 2, exchanges heat with the air inside the warehouse, and then flows from the discharge pipe 28 through the return pipe 16 to the tank 1.
Return within 1. The returned brine 12 is in tank 1
1 with the cooled stored brine 12 by the evaporator 13, and is again circulated by the pump 14 via the suction pipe 17. At this time, the other contact Th ₁ -b of the internal thermostat Th ₁ is also closed, so
Both fan motors FM ₁ and FM ₂ rotate, a large amount of air inside the refrigerator is circulated, and heat exchange with the cooler 2 is promoted. By repeating this process, the temperature inside the refrigerator gradually decreases.

The internal temperature T is the lower limit setting temperature T ₀ of the internal thermometer Th ₁
When this happens, the contact Th ₁ -a of the internal thermostat Th ₁ opens, the compressor 4 and the fan motor FM ₃ stop, and the
Solenoid valve V ₁ closes. Further, the other contact Th ₁ -b of the internal thermostat Th ₁ is also opened, and the fan motor FM ₁ is stopped. At this time, brine 12 in tank 11
has been cooled down to a low temperature, and the pump 14
It is circulated and supplied to the cooler 2. The air inside the refrigerator is circulated only by the fan motor FM ₂ .
It exchanges heat with the cooler 2 to continue cooling the inside of the refrigerator. In this embodiment, it is preferable that the fan motor FM ₂ has the same capacity or a smaller capacity than the fan motor FM _{1 .}
The smaller the amount of heat generated, the slower the temperature rise inside the refrigerator will be, and the longer the cold storage operation period will be.

The temperature inside the refrigerator T is the heat that enters from outside the refrigerator through the insulation material, the heat radiated from the stored food, and the fan motor FM ₂ .
It gradually increases due to heat generation, etc. During the cold storage operation period in which the temperature T in the refrigerator reaches from the lower limit set temperature T ₀ to the upper limit set temperature T ₁ , as described above, the temperature difference between the cooler 2 and the refrigerator air almost disappears, and the humidity in the refrigerator increases.

However, when the internal temperature T reaches the upper limit set temperature T ₁ of the internal thermostat Th ₁ , the contact Th ₁ of the internal thermostat Th ₁
-a is closed, the compressor 4 and the fan motor FM ₃ are started in the same way as described above, and the solenoid valve V ₁ is opened to restart the cooling operation of the refrigeration system 10. When this cooling operation is started, the other contact Th ₁ -b of the internal thermostat Th ₁ is closed, the fan motor FM ₁ also restarts operation, and the internal air is circulated together with the fan motor FM ₂ . The inside of the refrigerator is cooled by exchanging heat with the cooler 2. In this way, during the cooling operation period, both fan motors FM ₁ and FM ₂ rotate, so the cooler 2
The heat exchange rate with the refrigerator is improved, and the inside of the refrigerator is cooled in a short time. When the internal temperature reaches the lower limit set temperature T ₀ , the contact Th ₁ -a of the internal thermostat Th ₁ opens, and the refrigeration system 1
At the same time, the other contacts Th ₁ -b are also opened and the fan motor FM ₁ is stopped.

By repeating the above cycle, the internal temperature is maintained between the upper limit set temperature T ₁ and the lower limit set temperature T ₀ .

Furthermore, when the refrigerator enters the defrosting cycle, the connection of the movable contact c of the Cam Timer TM is switched to the fixed contact b side. At this time, the temperature of the cooler 2 has become sufficiently low, so the thermostat _Th2 is in a closed state. Therefore, power supply to the heater H is started, and defrosting is performed. When defrosting is completed, thermometer _Th2 detects this and enters the open state, cutting off the power supply to heater H. Thereafter, when the defrosting cycle ends and the connection of the cam timer TM is switched to the side between contacts a and c, the above-mentioned cooling cycle is started again.

When defrosting is finished, as shown in Figure 8, the internal temperature T is considerably higher than the upper limit set temperature, but at this time both contacts Th ₁ -a and Th ₁ -b are closed. Therefore, when the cooling operation is started, the amount of circulating air in the refrigerator increases, and heat exchange is performed efficiently.

In this example, the configuration is such that the fan motor FM ₁ is always stopped during the cold storage operation period.
As in the embodiment, the fan to be stopped may be changed every time the cold storage operation is started.

As described above, according to the second embodiment, the amount of heat generated by the fan motor is suppressed during the cold storage operation when the temperature inside the refrigerator reaches the upper limit set temperature from the lower limit set temperature, so the stop time of the refrigeration equipment is extended. As a result, the starting load is reduced, and the durability of the compressor parts can be extended. Furthermore, since the operation rate of the refrigeration system is reduced and the starting current is also reduced, energy saving of electric power is achieved. Furthermore, a high humidity state can be maintained for a long time due to a reduction in air volume during cold storage operation, a reduction in fan heat generation, etc., so moisture evaporation of stored foodstuffs is suppressed and freshness lasts for a long time.

In the first and second embodiments described above, 2
However, three or more ventilation fans may be installed and only some of the fans may be operated depending on the operating state of the refrigerator. Even in this case, the same effect as described in the first embodiment can be obtained by sequentially switching the blower fans to be stopped.

Effects of the Invention As described above, according to the constant temperature and high humidity refrigerator according to the present invention, the inside of the cooling duct is divided into a plurality of independent chambers by partition plates, and a fan is installed in each opening correspondingly communicating with each independent chamber. A plurality of fans are provided, and by selectively operating individual fans by electric control means, the air inside the refrigerator is circulated to the side of the cooler facing the independent room where the operating fan is located. It's summery. Therefore, frost formation on the cooler can be averaged out, and heat exchange efficiency will not be reduced. Therefore, it is possible to prevent the cooling time from becoming too long and to effectively maintain high humidity inside the refrigerator.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a constant temperature and high humidity refrigerator according to the first embodiment of the present invention, FIG. 2 is a detailed configuration diagram of the brine tank shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the - line in FIG. FIG. 4 is an electric control circuit diagram for controlling the constant temperature and humidity refrigerator according to the first embodiment, FIG. 5 is an explanatory diagram of the on/off timing of the counter contacts in the counter shown in FIG. 4, and FIG. FIG. 7 is a timing chart diagram explaining the operation of the electric control circuit shown in FIG. FIG. 9 is a timing chart diagram illustrating the operation of the conventional constant temperature/humidity refrigerator. 1...Box, 1a...Storage, 2...Cooler,
3... Unit part, 4... Compressor, 5... Condenser, 10... Refrigeration device, 11... Brine tank, 12... Brine, 13... Evaporator, F ₁ ,
F ₂ ...Blower fan, FM ₁ , FM ₂ ...Fan motor, Th ₁ ...Internal thermostat, Th ₁ -a, Th ₁ -b...
...Electric contact of internal thermostat, C...Counter, C ₁₁ ,
C ₁₂ ……Counter contact.

Claims (1)

[Claims for Utility Model Registration] A box 1 defining a storage 1a for cooling and storing foodstuffs, and a refrigerant compressor 4, condenser 5, etc. arranged adjacent to the storage 1a. a unit section 3 comprising a refrigeration system 10, a brine tank 11 that houses an evaporator 13 connected to the refrigeration system 10 and stores brine 12 therein;
It consists of a cooler 2 that cools the inside of the storage 1a by circulating air, and a plurality of fans F that are arranged close to the cooler 2 and forcibly bring the air inside the storage into contact with the cooler 2. In the constant temperature/humidity refrigerator, there is provided a cooling duct 35 which is disposed in the storage 1a and covers the cooler 2 in a non-contact manner, and whose upper part is sealed and whose lower part is open; a partition plate 40 dividing the cooling duct into independent chambers, a plurality of openings 36 opened in the cooling duct 35 and correspondingly communicating with the plurality of independent chambers, and arranged correspondingly to the plurality of openings 36, A plurality of fans F that can be operated selectively, and when the temperature inside the refrigerator is lower than the upper limit set temperature _T1 , only a part of the plurality of fans F is operated, and a part of the fans F that should be operated is operated. By selectively operating the individual fans F by this electrical control means, an electrically controlled electric control means is provided which is configured to sequentially switch the fan F. A constant-temperature and high-humidity refrigerator characterized in that it is configured to circulate air to even out frost buildup in the cooler 2.