JP2021146009A - Disinfection storage cabinet - Google Patents

Abstract

To provide a disinfection storage cabinet capable of cooling efficiently, a stored object in the cabinet, without taking ambient air.SOLUTION: A storage space and a distribution path are defined in the cabinet, and a heater and a fan are arranged in the distribution path. A hot wind generated by the heater and the fan circulates in the storage space and the distribution path, for disinfecting and drying the stored object stored in the storage space. A plurality of evaporators 32, 33 forming a freezer 27 is arranged between the heater and the fan, and cold air generated by the evaporator 32, 33 and the fan circulates in the storage space and the distribution path, for cooling the stored object in the storage space. The freezer 27 controls so as to suppress a load applied to a compressor 28, on the basis of a coolant temperature on a discharge side temperature sensor 51 for detecting a temperature of a coolant discharged from the compressor 28, in a cooling operation.SELECTED DRAWING: Figure 3

Description

The present invention relates to a disinfection storage that disinfects and dries the stored material contained in the storage with heated air.

In kitchen facilities such as hospitals, schools and other restaurants, disinfection storage that stores wet tableware, chopsticks, and other metal fixtures such as knives and forks in the refrigerator and dries them in a disinfected state. Is preferably used. The disinfection storage is provided with a heating source represented by an electric heater and a blower fan, and the heated air that has exchanged heat with the heat source by operating the blower fan is circulated in the storage room (inside the chamber) that houses the stored items. , The stored material is heated to a high temperature with heated air for sterilization and drying.

The disinfection storage is extremely hygienic because it disinfects the stored items in the process of drying. By the way, in kitchen facilities and the like, there is a demand for taking out stored items that have been disinfected and dried and using them for serving such as serving cold dishes on the stored items. However, since the stored matter after drying is in a high temperature state, there is a problem that it is not suitable for serving cold dishes. Therefore, there has been proposed a disinfection storage that is provided with a cooling function in addition to the heat-drying function, disinfects and dries the stored items, and then cools the stored items to a temperature required for serving (see, for example, Patent Document 1). ). The disinfection storage disclosed in Patent Document 1 is configured to take in outside air into the storage chamber to perform primary cooling, and then perform secondary cooling by a refrigerator.

Japanese Unexamined Patent Publication No. 2003-310527

In the disinfection storage disclosed in Patent Document 1, external air is introduced from the inlet into the storage room for primary cooling, but there is a problem that it takes time to cool the stored material because the cooling medium is room temperature air. be. In addition, since the external air taken into the storage room contains airborne bacteria (miscellaneous bacteria), dust and other contaminants, the disinfected storage material will be recontaminated. For this reason, although a fine mesh filter is arranged at the intake of the disinfection storage, there is a possibility that a pressure loss may occur, the amount of external air taken in may decrease, and the effect of primary cooling may decrease. In addition, it is necessary to replace the filter regularly, open the intake for primary cooling, and provide a damper to close the intake for disinfection drying and secondary cooling, resulting in manufacturing costs and maintenance costs. It is also pointed out that there is a problem that it is bulky. It is also pointed out that if the primary cooling is insufficient, the compressor of the refrigerator will be overloaded during the secondary cooling, making it impossible to perform efficient cooling.

That is, the present invention has been proposed in view of the above-mentioned problems inherent in the above-mentioned prior art, and has been proposed to preferably solve the above-mentioned problems, and it is possible to effectively cool the stored items in the refrigerator without taking in outside air. The purpose is to provide a disinfectant storage that can be used.

In order to overcome the above-mentioned problems and achieve the intended purpose, the disinfection storage according to the invention of claim 1 is provided.
In a disinfection storage that heats and disinfects and dries the stored items stored in the refrigerator with the heated air generated by the heater and fan.
It is equipped with a freezer in which a compressor, a condenser, an expansion means, and an evaporator are connected so that the refrigerant circulates in this order.
The refrigerating device has a plurality of the evaporators that can exchange heat with the air inside the refrigerator.
Discharge side temperature detecting means for detecting the temperature of the refrigerant discharged from the compressor, and
The heater, the fan, and the control device for controlling the refrigerating device are provided.
It is a gist that the control device is configured to control the refrigerating device so as to suppress the load of the compressor based on the refrigerant temperature detected by the discharge side temperature detecting means during the cooling operation by the refrigerating device. And.
In the invention of claim 1, the cooling operation by the refrigerating apparatus can be started without introducing outside air into the refrigerator to hygienically cool the stored matter. Further, since the refrigerating device is provided with a plurality of evaporators, the inside of the refrigerator can be efficiently cooled in a short time. Further, since the refrigerating apparatus is controlled so as to suppress the load of the compressor based on the temperature of the refrigerant discharged from the compressor, efficient cooling operation can be performed without overloading the compressor.

The invention according to claim 2 is
The gist is that the evaporator is arranged at a position where air flows by the operation of the fan.
In the invention of claim 2, since the fan used in the heating operation can be shared as a fan that sends air to the evaporator during the cooling operation, an increase in the number of parts can be suppressed.

The invention according to claim 3 is
A liquid bypass pipe having one end connected to the refrigerant pipe connecting the condenser and the evaporator and the other end connecting to the refrigerant pipe connecting the evaporator and the compressor.
A bypass valve inserted in the liquid bypass pipe is provided.
When the refrigerant temperature detected by the discharge side temperature detecting means during the cooling operation by the refrigerating device is a high load temperature for refrigerant bypass, the control device opens the bypass valve and is condensed by the condenser. The gist is that the refrigerant is configured to bypass the refrigerant pipe connecting the evaporator and the compressor via the liquid bypass pipe.
In the invention of claim 3, since the refrigerant sucked into the compressor can be cooled by the refrigerant condensed by the condenser, the temperature of the compressor can be kept even at the initial stage of the cooling operation when the inside of the refrigerator is in a high temperature state. , It is possible to suppress the load on the compressor by preventing the upper limit of normal operation from being exceeded.

The invention according to claim 4 is
A liquid bypass pipe having one end connected to the refrigerant pipe connecting the condenser and the evaporator and the other end connected to the compressor.
A bypass valve inserted in the liquid bypass pipe is provided.
When the refrigerant temperature detected by the discharge side temperature detecting means during the cooling operation by the refrigerating device is a high load temperature for refrigerant bypass, the control device opens the bypass valve and is condensed by the condenser. The gist is that the refrigerant is configured to bypass the compressor via the liquid bypass pipe.
In the invention of claim 4, since the compressor can be cooled by the refrigerant condensed by the condenser, the temperature of the compressor can be normally operated even in the initial stage of the cooling operation when the inside of the refrigerator is in a high temperature state. It is possible to suppress the load on the compressor by preventing the upper limit from being exceeded.

The invention according to claim 5 is
A liquid bypass pipe having one end connected to the refrigerant pipe connecting the condenser and the evaporator and the other end connecting to the refrigerant pipe connecting the evaporator and the compressor.
A bypass valve inserted in the liquid bypass pipe and
The liquid bypass pipe includes a bypass pipe that branches from the downstream side of the bypass valve and connects to the compressor.
When the refrigerant temperature detected by the discharge side temperature detecting means during the cooling operation by the refrigerating device is a high load temperature for refrigerant bypass, the control device opens the bypass valve and is condensed by the condenser. The gist is that the refrigerant is configured to be bypassed to the refrigerant pipe and the compressor connecting the evaporator and the compressor via the liquid bypass pipe.
In the invention of claim 5, since the refrigerant sucked into the compressor and the compressor can be cooled by the refrigerant condensed by the condenser, the compressor can be cooled even in the initial stage of the cooling operation when the inside of the refrigerator is in a high temperature state. It is possible to prevent the temperature of the compressor from exceeding the upper limit value that allows normal operation, and to suppress the load on the compressor.

The invention according to claim 6 is
When the refrigerant temperature detected by the discharge side temperature detecting means during the cooling operation by the refrigerating device is a high load temperature for adjusting the refrigerant, the control device is provided on each of the inlet sides of the refrigerant in the plurality of evaporators. The gist is that one of the on-off valves is closed to limit the number of evaporators through which the refrigerant circulates.
In the invention of claim 6, when a high load is applied to the compressor, the amount of refrigerant returning from the evaporator to the compressor is reduced, so that the load applied to the compressor can be reduced.

The invention according to claim 7 is
The gist is that a heat exchange unit is provided to exchange heat between the refrigerant flowing through the refrigerant pipe connecting the condenser and the evaporator and the refrigerant flowing through the refrigerant pipe connecting the evaporator and the compressor. ..
In the invention of claim 7, the refrigerant returning to the compressor can be cooled by the heat exchange unit, and overheating of the compressor can be suppressed.

The invention according to claim 8 is
When the defrosting start condition is satisfied during the cooling operation by the refrigerating device, the control device closes the on-off valves provided on the inlet side of the refrigerant in the plurality of evaporators to provide the refrigerant to the evaporator. The gist is that the defrosting operation, in which the supply of the above-mentioned material is stopped over the defrosting time, can be sequentially performed by a plurality of evaporators.
In the invention of claim 8, while cooling the inside of the refrigerator with any of the plurality of evaporators, it is possible to prevent the frost adhering to the other evaporators from growing significantly and reducing the cooling capacity.

The invention according to claim 9 is
The control device is a pump that drives the compressor with the on-off valve provided in the refrigerant pipe connecting the condenser and the evaporator closed after the conditions for terminating the cooling operation by the refrigerating device are satisfied. The gist is that it is configured to allow down operation.
In the invention of claim 9, after the end condition of the cooling operation is satisfied, the pump down operation is performed so that the refrigerant remaining in the evaporator and the refrigerating machine oil contained in the refrigerant can be recovered in the condenser and the compressor. Therefore, it is possible to suppress thermal deterioration of the refrigerant and the refrigerating machine oil during the subsequent heating operation. In addition, the refrigerant in the freezing circuit is not heated and expanded during the heating operation, and the pressure rise in the freezing circuit can be suppressed.

The invention according to claim 10 is
In the control device, the compressor is in a state where the on-off valve provided in the refrigerant pipe connecting the condenser and the evaporator is closed before starting the heating operation for disinfecting and drying the stored matter with the heated air. The gist is that it is configured so that the pump-down operation that drives the water can be performed.
In the invention of claim 10, even if the pump-down operation after the cooling operation is not performed due to a power failure or the like, the pump-down operation is performed before the heating operation, so that the refrigerant and the refrigerating machine oil are thermally deteriorated during the heating operation. It is possible to suppress the pressure rise in the refrigeration circuit as well as to suppress the pumping.

The invention according to claim 11
It is a gist that a timer device for controlling the end of the heating operation for disinfecting and drying the stored material with the heated air and the start of the cooling operation by the refrigerating device is provided.
In the invention of claim 11, the cooling operation can be automatically started by the timer device, and the burden on the operator can be reduced.

The invention according to claim 12
The gist is that an auxiliary condenser is provided in the refrigerant pipe connecting the evaporator and the compressor.
In the invention of claim 12, the refrigerant superheated by exchanging heat with the stored matter in the evaporator can be cooled by the auxiliary condenser, and the overheating of the compressor can be suppressed.

The invention according to claim 13 is
An end time setting means capable of setting the end time of the cooling operation by the refrigerating device, and
It is equipped with an internal temperature detecting means for detecting the temperature inside the refrigerator and an external temperature detecting means for detecting the temperature outside the refrigerator.
The control device disinfects and dries the stored object with the heated air. After the heating operation is completed, the control device is based on the internal temperature and the external temperature detected by the internal temperature detecting means and the external temperature detecting means. The cooling operation time required to reach the cooling completion temperature when the internal temperature is cooled is calculated, and the cooling operation start is calculated back from the end time set in the end time setting means by the cooling operation time. Update as time,
The gist is that the control device is configured to start the cooling operation by the refrigerating device when it is determined that the current time is the start time or the start time has passed.
In the invention of claim 13, since the cooling operation time can be changed to the minimum necessary length according to the change of the temperature inside and outside the refrigerator, it is possible to prevent the freezing device from being wastefully operated and to make electricity. The amount used can be reduced.

According to the disinfection storage according to the present invention, the stored material can be cooled hygienically and effectively without taking in outside air into the storage.

It is the schematic perspective view which shows the disinfection storage which concerns on Example. It is a schematic longitudinal front view which shows the disinfection storage which concerns on Example. It is the schematic which shows the refrigerating circuit of the refrigerating apparatus which concerns on Example. It is a control block diagram of the disinfection storage which concerns on Example. It is a timing chart figure of the disinfection storage based on the setting of the timer device which concerns on Example. It is the schematic which shows the refrigerating circuit of the refrigerating apparatus which concerns on 1st another embodiment. Another second embodiment is a control block diagram of a disinfection storage. It is explanatory drawing which shows the relationship between the temperature inside the refrigerator and the temperature outside the refrigerator at the time of calculating the start time of the cooling operation of the disinfection storage according to the second alternative embodiment. It is a flowchart of the disinfection storage which concerns on 2nd another embodiment.

Next, the disinfection storage according to the present invention will be described below with reference to the accompanying drawings with reference to suitable examples. In the embodiment, the shelves on which the tableware baskets, which are stored items, are placed, accommodate the tableware carts provided in a plurality of upper and lower stages in the refrigerator, and the hot air is circulated in the cabinet to circulate the tableware cart. The disinfection storage of the cart-in specification that disinfects and dries the tableware etc. in the tableware basket placed in the above will be described. It may have other configurations such as a cabinet.

1 and 2 are schematic views showing a disinfection storage of an embodiment. The disinfection storage circulates hot air (heated air) inside the box body 10 having a heat insulating structure in which a heat insulating material such as glass wool or urethane foam is provided between the exterior and the interior, and inside the box body 10 (that is, inside the box). It is provided with hot air circulation means 11 and 12 for causing the hot air to be circulated, and a blower guide 14 for forming a movement path 13 of hot air sent out from the hot air circulation means 11 and 12 along the upper surface and both side surfaces of the refrigerator. Further, an entrance / exit 10a of the tableware cart 15 is provided on the front surface of the box body 10, and a door 16 capable of opening / closing the entrance / exit 10a is arranged on the box body 10.

The tableware cart 15 is used to transport dishes and the like washed in a dishwashing area such as a kitchen to a disinfection storage. As shown in FIG. 2, the tableware cart 15 has four rectangular frame-shaped upper frames 17 and lower frames 18 that open vertically and four corners that extend in the vertical direction and connect the four corners of the upper frame 17 and the lower frame 18. A pillar 19 and a plurality of upper and lower shelves 20 supported inside each pillar 19 are provided, and casters 21 having wheels are attached to four corners of the lower surface of the lower frame 18. That is, the tableware cart 15 can hold a tableware basket containing tableware and the like on each shelf 20, and is configured to be movable by a plurality of casters 21. The shelf 20 is formed in a fence shape in which a plurality of rods 20a extending in the front-rear direction are arranged so as to be separated from each other in the left-right direction so as to allow air to pass in the plate thickness direction (vertical direction). It is configured.

As shown in FIG. 2, the blower guide 14 includes an upper plate 22 parallel to the upper surface of the refrigerator, left and right side plates 23, 23 parallel to the side surface of the refrigerator, front ends of the side plates 23, and the front end of each side plate 23. It is provided with extension plates 24, 24 extending from the rear end toward the corresponding side surface in the refrigerator. Then, between the upper plate 22 of the blower guide 14 and the upper surface of the refrigerator, an upstream portion 13a extending in the left-right direction of the downward U-shaped movement path 13 is formed. Further, a downstream portion 13b of the movement path 13 extending in the vertical direction is formed inside the blower guide 14 surrounded by the side plates 23, 23 and the extension plates 24, 24 and the side surface of the refrigerator. Further, the side plates 23, 23 of the blower guide 14 are configured to close the downstream ends of the downstream portion 13b.

The hot air circulation means 11 and 12 are composed of a heater 11 for heating the air in the refrigerator and a fan 12 including a sirocco fan for blowing the air (hot air) heated by the heater 11. The heater 11 is formed in an annular shape in the upstream portion 13a of the movement path 13 so that the suction port 22a, which will be described later, is located inside. Further, the fan 12 includes a motor 12a arranged outside the refrigerator and an impeller 12b rotationally driven by the motor 12a, and the impeller 12b is arranged inside the heater 11 in the upstream portion 13a. By rotationally driving the impeller 12b, hot air heated by the heater 11 is sent out to both the left and right sides.

As shown in FIG. 2, a storage space 25 capable of accommodating the tableware cart 15 is formed inside the blower guide 14 in the refrigerator. The bottom surface of the refrigerator is located at a height (below the center of rotation of the wheels of the casters 21) on which the tableware cart 15 can ride from the floor surface of the kitchen or the like where the disinfection storage is installed. When the tableware cart 15 is taken in and out of the box body 10, a slope member having an inclined surface that inclines upward toward the bottom surface of the refrigerator is arranged on the floor surface of the kitchen or the like, or a recess in which the floor surface is dug down. By arranging the box body 10 so as to accommodate the bottom portion of the box body so that the bottom surface of the chamber and the floor surface are at the same height, the tableware cart 15 can be easily taken in and out of the box body 10.

As shown in FIG. 2, in the blower guide 14, air (hot air) from the movement path 13 to the accommodation space 25 side is provided at a height position between the shelves 20 of the tableware cart 15 on the left and right side plates 23 and 23. ) Is formed. Further, in the blower guide 14, an air (hot air) suction port 22a from the accommodation space 25 to the movement path 13 side is formed at a position below the hot air circulation means 11, 12 (12b) on the upper plate 22. Therefore, as shown by the arrows in FIG. 2, the hot air sent from the hot air circulation means 11 and 12 in the left-right direction along the upstream portion 13a of the movement path 13 is downward in the downstream portions 13b and 13b of the movement path 13. On the way to the lower part of the accommodation space 25, the hot air is blown out to the accommodation space 25 through the outlet 23a of the ventilation guide 14 and rises, and hot air is blown from the upper end of the accommodation space 25 through the suction port 22a of the ventilation guide 14. It returns to the upstream portion 13a where the circulation means 11, 12 (12b) are located. An internal temperature sensor (internal temperature detecting means) 26 for detecting the internal temperature is arranged in the vicinity of the suction port 22a.

The disinfection storage is provided with a freezing device 27 for cooling the inside of the storage (accommodation space 25). As shown in FIG. 3, the refrigerating apparatus 27 includes a compressor 28 that compresses the refrigerant, a condenser 29 that cools and liquefies the refrigerant pumped from the compressor 28, and a liquefied refrigerant liquefied by the condenser 29. It is provided with expansion valves 30, 31 as expansion means for expanding the liquefied refrigerant into a low-pressure liquefied refrigerant, and evaporators 32, 33 for vaporizing the liquefied refrigerant expanded by the expansion valves 30, 31. The refrigerating device 27 connects the compressor 28, the condenser 29, the expansion valves 30, 31 and the evaporators 32, 32 in an annular shape by the refrigerant pipe 34, and constitutes a refrigerating circuit in which the refrigerant circulates in this order. The refrigerating apparatus 27 of the embodiment includes a plurality of (two in the example) evaporators 32, 33 connected in parallel in the refrigerating circuit, and the evaporators 32, 33 are located upstream of the moving path 13. In 13a, it is arranged between the impeller 12b and the heater 11 so that it can exchange heat with the air sent by the operation (rotation) of the impeller 12b. In the embodiment, the first evaporator 32 and the second evaporator 33 for cooling the air in the refrigerator are arranged so as to sandwich the impeller 12b, and are cooled by the first evaporator 32 and the second evaporator 33. It is configured to blow air (cold air) by the impeller 12b. That is, the evaporators 32 and 33 are arranged at a position where air flows by the operation of the fan 12 that generates hot air by the heater 11, and the heating operation that disinfects and dries the stored matter by the hot air and the cold air by the freezing device 27 are used. The fan 12 can be shared with the cooling operation of the above. The expansion valve 30 arranged on the upstream side of the first evaporator 32 is referred to as the first expansion valve 30, and the expansion valve 31 arranged on the upstream side of the second evaporator 33 is referred to as the second expansion valve. It is referred to as 31.

As shown in FIG. 3, the refrigerant pipe 34 has a first connecting pipe 35 connecting the compressor 28 and the condenser 29, and a second connecting pipe connecting the condenser 29 and the expansion valves 30, 31. 36, a third connecting line 37, 37 connecting the expansion valves 30, 31 and the evaporator 32, 33, and a fourth connecting line 38 connecting the evaporator 32, 33 and the compressor 28 are provided. .. The refrigeration circuit includes a second connection line 36 (a refrigerant pipe connecting the condenser 29 and the evaporators 32 and 33 (refrigerant pipe on the high pressure side)) connecting the condenser 29 and the expansion valves 30 and 31. The fourth connecting line 38 (refrigerant pipe connecting the evaporators 32, 33 and the compressor 28 (refrigerant pipe on the low pressure side)) connecting the evaporators 32, 33 and the compressor 28 has a predetermined length. A heat exchange unit (load suppressing means) 39 arranged so as to be close to or in contact with each other is provided, and in the heat exchange unit 39, the liquid refrigerant flowing through the second connection line 36 and the gas flowing through the fourth connection line 38 are provided. It is configured so that it can exchange heat with the refrigerant. The length of the heat exchange unit 39 is such that the detection temperature of the discharge side temperature sensor 51, which will be described later, detects the refrigerant temperature on the discharge side of the refrigerant from the compressor 28 is within a preset predetermined temperature or less. It is set to a length (for example, 250 mm) that can suppress a decrease in cooling capacity when the temperature inside is high.

As shown in FIG. 3, in the second connecting pipeline 36, a dryer 40 for removing water contained in the high-pressure liquid refrigerant flowing out of the condenser 29 and a site where the flow of the liquid refrigerant in the conduit can be visually observed. The glasses 41 are connected in series on the upstream side of the heat exchange unit 39. Further, the second connecting pipe 36 is branched into a first pipe 36a and a second pipe 36b on the downstream side of the heat exchange unit 39, and the first pipe 36a is a first solenoid valve (load suppressing means). ) 42, and the second pipeline 36b is connected to the inlet side of the second expansion valve 31 via the second solenoid valve (load suppressing means) 43. ing. The first solenoid valve 42 and the second solenoid valve 43 are on-off valves arranged on the inlet side of the refrigerant to the first and second evaporators 32 and 33, and the solenoid valves 42 and 43 are independent of each other. By opening and closing, the refrigerant can be selectively supplied to and cut off from the first and second evaporators 32 and 33. The upstream portion of the fourth connecting pipe 38 is a first outflow pipe 38a connected to the outlet side of the first evaporator 32 and a second outflow pipe 38b connected to the outlet side of the second evaporator 33. It is branched to. A first temperature sensitive cylinder 44 for detecting the temperature of the refrigerant gas flowing out from the first evaporator 32 is disposed in the first outflow pipe 38a, and the first expansion is based on the detected temperature of the first temperature sensitive cylinder 44. The opening degree of the valve 30 is adjusted. Further, a second temperature sensitive cylinder 45 for detecting the temperature of the refrigerant gas flowing out from the second evaporator 33 is provided in the second outflow pipe 38b, and the second temperature sensitive cylinder 45 is based on the detected temperature of the second temperature sensitive cylinder 45. 2 The opening degree of the expansion valve 31 is adjusted. A check valve 46 is connected to the fourth connection pipeline 38 on the downstream side of the heat exchange unit 39 to prevent the refrigerant from flowing back from the downstream side to the upstream side of the check valve 46. Further, in the fourth connection line 38 between the compressor 28 and the check valve 46, an accumulator 47 for separating the refrigerant flowing into the container into gas and liquid and returning the gas refrigerant to the compressor 28 is provided. It is connected.

As shown in FIG. 3, the inlet side (one end) of the liquid bypass pipe (load suppressing means) 49 is connected between the sight glass 41 and the heat exchange unit 39 in the second connecting pipe 36, and the said A bypass valve (load suppressing means) 48 such as a solenoid valve is inserted in the liquid bypass pipe 49. The liquid bypass pipe 49 branches into a first bypass pipe 49a and a second bypass pipe (bypass pipe) 49b on the downstream side of the bypass valve 48, and the outlet side (the other end) of the first bypass pipe 49a is It is connected to the fourth connection line 38 between the check valve 46 and the accumulator 47, and the outlet side of the second bypass line 49b is connected to the compressor 28. That is, the bypass valve 48 is opened and the low-temperature liquefied refrigerant flowing out of the condenser 29 is supplied to the fourth connecting pipe 38 via the first bypass pipe 49a (so-called liquid bypass). 4 It is configured to cool the inside of the compressor by cooling the refrigerant gas in the connecting pipe and supplying it to the compressor 28 (so-called liquid injection) via the second bypass pipe 49b. Further, the refrigerating device 27 includes a condenser fan 50 that blows air to the condenser 29 to promote the condensation of the refrigerant, that is, the release of heat.

The disinfection storage includes a discharge side temperature sensor (discharge side temperature detection means) 51, a high pressure pressure sensor (high pressure pressure detection means) 52, a suction side temperature sensor (suction side temperature detection means) 53, and a low pressure pressure sensor (low pressure). It has a pressure detecting means) 54 and. The discharge side temperature sensor 51 is provided around the discharge port of the compressor 28, and detects the discharge temperature, which is the temperature of the refrigerant discharged from the compressor 28. The high-pressure pressure sensor 52 is provided around the discharge port of the compressor 28 and detects the high-pressure pressure which is the pressure of the refrigerant discharged from the compressor 28. The suction side temperature sensor 53 is provided around the suction port of the compressor 28 and detects the suction temperature, which is the temperature of the refrigerant sucked into the compressor 28. The low-pressure pressure sensor 54 is provided around the suction port of the compressor 28 and detects the low-pressure pressure which is the pressure of the refrigerant sucked into the compressor 28.

The disinfection storage has a control device 55 that controls the hot air circulation means 11 and 12 and the refrigeration device 27. As shown in FIG. 4, various actuators such as a heater 11, a fan 12, a compressor 28, a first electromagnetic valve 42, a second electromagnetic valve 43, a bypass valve 48, and a condenser fan 50 are connected to the control device 55. At the same time, various sensors such as an internal temperature sensor 26, a discharge side temperature sensor 51, a high pressure pressure sensor 52, a suction side temperature sensor 53, and a low pressure pressure sensor 54 are connected. Then, the control device 55 operates the various actuators 11,12,28,42,43,48,50 based on the detection information (temperature, pressure, etc.) of the various sensors 26,51,52,53,54. Control.

The control device 55 controls the heater 11 to be ON-OFF based on the temperature inside the refrigerator detected by the temperature sensor 26, so that the temperature of the accommodation space 25 is set to a preset set temperature T (for example, 90). Hold at ℃). Further, the control device 55 keeps the temperature inside the refrigerator at the set temperature T for the heating time set in the timer device 57, which will be described later, and then turns off the heater 11 to end the heating operation of disinfecting and drying the stored object with hot air. It is composed.

The control device 55 is configured to start a cooling operation by the refrigerating device 27 to cool the inside of the refrigerator after the heating operation is completed. In the embodiment, by driving (ON) the compressor 28 and operating (ON) the fan 12, the cold air cooled by the evaporators 32 and 33 is circulated in the refrigerator to cool the stored object. The refrigerating device 27 includes load suppressing means 39,42,43,48,49 that suppress the load of the compressor 28 in the cooling operation, and the control device 55 is the discharge side temperature sensor 51 during the cooling operation by the refrigerating device 27. The refrigerating apparatus 27 is controlled by the load suppressing means 39, 42, 43, 48, 49 so as to suppress the load of the compressor 28 based on the discharge temperature of the refrigerant detected in.

In the control device 55, the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 during the cooling operation by the refrigeration device 27 is the first high load temperature (refrigerant) in which a high load is applied to the compressor 28. In the case of a high load temperature for bypass), the bypass valve 48 is opened, and the refrigerant condensed by the condenser 29 is bypassed to the fourth connection line 38 and the compressor 28 via the liquid bypass pipe 49. Is configured. Further, the control device 55 closes the bypass valve 48 on the condition that the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 drops to a preset bypass end temperature while the bypass valve 48 is open. It is configured to stop the bypass of the refrigerant condensed by the condenser 29 to the fourth connecting line 38 and the compressor 28. The first high load temperature is an upper limit of the temperature at which the compressor 28 can operate normally, for example, 80 ° C., and the bypass end temperature is only 5 ° C. from the first high load temperature. It is a low temperature.

In the control device 55, the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 during the cooling operation by the refrigeration device 27 is a second high load temperature (refrigerant adjustment) in which a high load is applied to the compressor 28. In the case of high load temperature), one of the first electromagnetic valve 42 and the second electromagnetic valve 43 is closed to reduce the amount of refrigerant returned from the evaporators 32 and 33 to the compressor 28. .. That is, the high load of the compressor 28 is reduced by stopping the supply of the refrigerant to the evaporators 32 and 33 of one of the two and reducing the amount of the refrigerant returning to the compressor 28. .. Further, in the control device 55, the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 drops to a preset adjustment end temperature in a state where the refrigerant returns from only one of the evaporators 32 and 33 to the compressor 28. All the solenoid valves 42 and 43 are configured to be opened on condition that the above is done. The second high load temperature is set to a value lower than the bypass end temperature, and the adjustment end temperature is set to a value lower than the second high load temperature.

The control device 55 performs a defrosting operation when a predetermined defrosting start condition is satisfied during the cooling operation by the refrigerating device 27. The conditions for starting defrosting are "a certain amount of time has passed since the last defrosting operation was completed", "a preset time has been reached", and "the user has performed a defrosting start operation". The defrosting start condition can be appropriately determined. In the disinfection storage of the embodiment, when the defrosting start condition is satisfied, the control device 55 sets either the first solenoid valve 42 or the second solenoid valve 43 for a preset defrosting time. The first evaporator 32 and the second evaporator 33 are configured to alternately perform a defrosting operation for temporarily stopping the supply of the refrigerant to the corresponding evaporators 32 and 33. That is, when the supply of the refrigerant to either the first evaporator 32 or the second evaporator 33 is stopped, the air flows by the operation of the fan 12, and the refrigerant does not flow in the evaporators 32, 33. Defrosting is being performed.

In the control device 55, the compressor 28 is in a state in which the pipe pass valves 48, the first and second solenoid valves 42, 43 are closed after the termination condition (described later) of the cooling operation by the refrigeration device 27 is satisfied. It is configured to be capable of performing a pump down operation (PD) to drive the. In the embodiment, after the end condition of the cooling operation is satisfied, the compressor 28 is continuously driven, and when the detection pressure of the low pressure pressure sensor 54 drops to the preset pump down end pressure, the control device 55 Is configured to stop driving the compressor 28. That is, by performing the pump-down operation after the end condition of the cooling operation is satisfied, the refrigerant remaining in the evaporators 32 and 33 and the refrigerating machine oil contained in the refrigerant can be recovered in the condenser 29 and the compressor 28. It has become like. Further, in the disinfection storage of the embodiment, the control device 55 is configured to be able to perform the pump-down operation before starting the heating operation of heating the stored object by the heated air generated by the heater 11 and the fan 12. Will be done. In the embodiment, the control device 55 starts the pump-down operation after the end condition of the cooling operation is satisfied on the condition that the end condition is satisfied, and the pump-down operation before the start of the heating operation is low pressure. The pressure sensor 54 is configured to start on condition that the detected pressure is a preset pump-down start pressure. The pump-down start pressure is a pressure in a state where the refrigerant remains in the evaporators 32 and 33 and the fourth connection pipe 38 without performing the pump-down operation after the cooling operation. Further, the pump-down operation performed before the start of the heating operation is stopped when the detection pressure of the low-pressure pressure sensor 54 drops to the pump-down end pressure.

The disinfection storage of the embodiment is provided with a timer device 57 that controls the end of the heating operation and the start of the cooling operation by the refrigerating device 27 (see FIG. 4). The timer device 57 includes a timer setting unit 58 connected to the control device 55 and a time measuring unit 59 provided in the control device 55. In the timer setting unit 58, a clock circuit that generates a reference clock, a time measuring means that measures the time based on the reference clock, a timer time setting means that sets the timer time, and a current time measured by the time measuring means are timers. It is provided with a signal output unit that outputs a drive control signal when the timer time set by the time setting means is reached. The timer setting unit 58 of the embodiment can set the heating start timer time and the cooling start timer time by the timer time setting means, and when the heating start timer time is reached, the control device 55 is heated as a drive control signal. When the operation start signal is output and the cooling start timer time is reached, the control device 55 is configured to output a cooling operation start signal as a drive control signal (see FIG. 5). Then, when the heating operation start signal is output, the control device 55 starts the heating operation by the heater 11 and the fan 12, and when the cooling operation start signal is output, the control device 55 starts the cooling operation by the refrigerating device 27. (The compressor 28 and the fan 12 are turned on).

The timekeeping unit 59 is configured to be able to set the heating time for performing the heating operation, and the control device 55 is a condition in which the internal temperature detected by the internal temperature sensor 26 first exceeds the set temperature T. Is set to start timing the heating time of the timing unit 59 when is satisfied. Then, at the same time as the time counting end of the heating time by the time measuring unit 59, the control device 55 turns off the heater 11 in preference to the control based on the detection temperature of the internal temperature sensor 26, and ends the heating operation. In the embodiment, by pressing the operation button connected to the control device 55 in the state where the heating operation and the cooling operation are not performed in the disinfection storage, the signal from the switch that switches the state by pressing the operation button is obtained. Based on this, the disinfection storage is configured to be in an operation standby state capable of heating operation and cooling operation, and to start timing by the time timing means of the timer setting unit 58. Further, the control device 55 is configured to end the cooling operation based on a signal (cooling operation end signal) from the switch whose state is switched by pressing the operation button while the cooling operation is being performed. NS. In the embodiment, the cooling operation end condition is satisfied when the cooling operation end signal is output from the switch (the signal is input to the control device 55) by pressing the operation button. In the disinfection storage of the embodiment in which the pump down operation is performed after the cooling operation, only the fan 12 is controlled to be OFF when the end condition of the cooling operation is satisfied, and the end condition of the pump down operation is satisfied (detection of the pump down end pressure). ) Turns off the compressor 28.

[Action of Example]
Next, the operation of the disinfection storage according to the embodiment will be described. It is assumed that the heating start timer time and the cooling start timer time are set in the timer setting unit 58.

In the disinfection storage, when the operation button is pressed while the tableware cart 15 in which a plurality of tableware baskets containing the stored items are placed on the shelf 20 is housed in the storage space 25, the timer setting unit 58 is timed. Timekeeping by means is started. When the current time measured by the time clock means reaches the heating start timer time set by the timer time setting means, a heating operation start signal is output from the signal output unit, and the control device 55 controls the heating operation. The heating operation by the heater 11 and the fan 12 is started based on the start signal (see FIG. 5). That is, the heater 11 and the fan 12 are ON-controlled to circulate the hot air between the moving path 13 and the accommodating space 25, and raise the temperature inside the accommodating space 25. When the internal temperature sensor 26 detects a preset set temperature T, the time counting unit 59 starts timing. After that, the control device 55 controls the heater 11 to be ON-OFF based on the temperature detected by the temperature sensor 26 in the refrigerator, and keeps the temperature of the accommodation space 25 at the set temperature T. Then, at the same time as the time measurement of the time measuring unit 59 ends, the control device 55 turns off the heater 11 in preference to the control based on the detection temperature of the internal temperature sensor 26, and ends the heating operation for disinfecting and drying the stored object. ..

If the low-pressure pressure sensor 54 does not detect the pump-down start pressure at the start of the heating operation, the control device 55 starts the heating operation without performing the pump-down operation. On the other hand, when the low pressure pressure sensor 54 detects the pump down start pressure, the pump down operation (PD) is performed and then the heating operation is started. That is, before starting the heating operation, the refrigerant remaining in the evaporators 32 and 33 and the fourth connecting pipe 38 is recovered in the condenser 29 and the compressor 28.

After the heating operation is completed, when the current time measured by the time timing means reaches the cooling start timer time set by the timer time setting means, a cooling operation start signal is output from the signal output unit, and the cooling operation start signal is output. The control device 55 starts the cooling operation by the refrigerating device 27 based on the cooling operation start signal (see FIG. 5). That is, the compressor 28 and the fan 12 are ON-controlled. During the cooling operation, the bypass valve 48 is closed and the solenoid valves 42 and 43 are open, so that the refrigerant (liquid refrigerant) discharged from the compressor 28 and condensed by the condenser 29 is used. It is supplied to the evaporators 32 and 33. As a result, the cold air that has exchanged heat with the refrigerant flowing through the evaporators 32 and 33 circulates in the moving path 13 and the accommodation space 25, and cools the inside of the accommodation space 25. Then, when the operation button is pressed during the cooling operation and a cooling operation end signal is output (the end condition is satisfied), the control device 55 controls the fan 12 to turn off to cool the stored object. End the operation. Further, when the end condition of the cooling operation is satisfied, the control device 55 controls only the fan 12 to be turned off while driving the compressor 28, and closes the bypass valves 48, the first and second solenoid valves 42, 43. Then, the pump down operation (PD) is performed. By this pump-down operation, the refrigerant remaining in the evaporators 32 and 33 and the fourth connecting pipe 38 is recovered in the condenser 29 and the compressor 28. Then, when the low pressure pressure sensor 54 detects the pump down end pressure, the control device 55 ends the pump down operation (compressor 28-OFF, fan 12-OFF, solenoid valve 42, 43-open) and disinfects and stores the device 55. Stop the operation of the warehouse.

Since the disinfection storage of the embodiment is configured to cool the stored material by starting the cooling operation by the refrigerating device 27 without introducing outside air into the accommodation space (inside the storage) 25 after the heating operation is completed. Can be cooled hygienically. Further, since the refrigerating device 27 includes a plurality of evaporators 32 and 33, the accommodation space 25 can be efficiently cooled in a short time. Further, since the fan 12 used in the heating operation is shared as a fan for sending air to the evaporators 32 and 33 in the cooling operation, it is possible to suppress an increase in the number of parts. Furthermore, since the cold air is blown out between the shelves 20 from the plurality of outlets 23a of the blower guide 14, the temperature distribution of the accommodation space 25 can be made uniform during the cooling operation as well as during the heating operation. ..

Here, when the cooling operation is started immediately after the end of the heating operation, since the accommodation space 25 has a high temperature, the refrigerant heat-exchanged by the evaporators 32 and 33 also has a high temperature, so that the refrigerant returns to the compressor. 28 is overheated. Then, when the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 becomes the first high load temperature at which the compressor 28 has a high load, the control device 55 opens the bypass valve 48, and the above. The refrigerant condensed by the condenser 29 is bypassed to the fourth connecting pipe 38 and the compressor 28 via the liquid bypass pipe 49. As a result, the temperature of the refrigerant sucked into the compressor 28 can be lowered, and the inside of the compressor 28 can be cooled, and the temperature of the compressor 28 can be quickly lowered to eliminate the high load state. .. That is, even in the initial stage of the cooling operation started immediately after the end of the heating operation, the load applied to the compressor 28 is suppressed by the load suppressing means including the liquid bypass pipe 49 and the bypass valve 48, and the temperature of the compressor 28 is adjusted. It is possible to prevent the upper limit of normal operation from being exceeded. When the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 reaches the bypass end temperature, the control device 55 closes the bypass valve 48. As a result, the refrigerant condensed by the condenser 29 is supplied to the evaporators 32 and 33, and the accommodation space 25 is cooled by the cold air that exchanges heat with the refrigerant flowing through the evaporators 32 and 33.

When the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 becomes the second high load temperature while the refrigerant is being supplied to the two evaporators 32 and 33, the control device 55 causes the control device 55 to move. One of the first solenoid valve 42 and the second solenoid valve 43 is controlled to be closed so as to limit the number of evaporators 32 and 33 through which the refrigerant circulates. As a result, the amount of refrigerant returning to the compressor 28 via the evaporators 32 and 33 can be reduced, and the load applied to the compressor 28 can be reduced. That is, during the cooling operation of the refrigerating device 27, the load applied to the compressor 28 can be suppressed by the load suppressing means including the solenoid valves 42 and 43. Then, when the discharge temperature of the refrigerant detected by the discharge side temperature sensor 51 reaches the adjustment end temperature, the control device 55 controls to open all the solenoid valves 42 and 43. That is, in the cooling operation in the state where the temperature of the accommodation space 25 is high, when the cooling operation is performed using the two evaporators 32 and 33, the amount of the high temperature refrigerant returning to the compressor 28 increases, and the compressor 28 The load applied to the compressor 28 may become large and efficient operation may not be possible, but the load applied to the compressor 28 can be reduced by performing the cooling operation with only one evaporator 32, 33. Further, if the load applied to the compressor 28 becomes small (if the discharge temperature of the refrigerant becomes equal to or lower than the adjustment end temperature), the cooling operation is performed by the two evaporators 32 and 33, so that the cooling rate can be increased. ..

The disinfection storage of the embodiment is provided with the heat exchange unit 39 for heat exchange between the refrigerant flowing through the second connecting pipe 36 and the refrigerant flowing through the fourth connecting pipe 38. Therefore, if the temperature of the accommodation space 25 (the temperature of the stored object) is high during the cooling operation and the temperature of the refrigerant flowing through the refrigeration circuit has a relationship of evaporator outlet temperature> condenser outlet temperature, heat exchange The refrigerant (gas refrigerant) returning to the compressor 28 can be cooled by the unit 39, and overheating of the compressor 28 can be suppressed. Further, when the temperature of the accommodation space 25 is lowered by the cooling operation and the temperature of the refrigerant flowing through the refrigeration circuit becomes the relationship of the evaporator outlet temperature <condenser outlet temperature, the refrigerant (liquid refrigerant) flowing out from the condenser 29 is excessive. It can be cooled, and the cooling capacity of the evaporators 32 and 33 can be improved.

Here, in the configuration in which the heater 11 and the evaporators 32 and 33 are arranged in the same space (upstream portion 13a) as in the disinfection storage of the embodiment, the evaporators 32 and 33 are heated by the heater 11 during the heating operation. Therefore, when the refrigerant remains in the evaporators 32 and 33 or the refrigerating machine oil is contained in the refrigerant, the refrigerant and the refrigerating machine oil remaining in the evaporators 32 and 33 are heated by the heating operation. There is a risk of thermal deterioration. In addition, the refrigerant remaining in the evaporators 32 and 33 may expand and the pressure may rise abnormally. However, in the disinfection storage of the embodiment, after the end condition of the cooling operation is satisfied, the pump down operation is performed, and the refrigerant remaining in the evaporators 32 and 33 and the refrigerating machine oil contained in the refrigerant are discharged into the condenser 29 and the compressor. Since it is collected in 28, it is possible to suppress thermal deterioration of the refrigerant and the refrigerating machine oil even if the evaporators 32 and 33 are heated by the heater 11 in the subsequent heating operation. In addition, the refrigerant in the freezing circuit is not heated and expanded during the heating operation, and the pressure rise in the freezing circuit can be suppressed. This improves the startability of starting the cooling operation.

Further, since the disinfection storage of the embodiment is configured so that the pump-down operation can be performed before the heating operation is started, even if the pump-down operation after the cooling operation is not performed due to a power failure or the like. By performing the pump down operation before the heating operation, it is possible to suppress the thermal deterioration of the refrigerant and the refrigerating machine oil during the heating operation, and it is possible to suppress the pressure rise in the refrigerating circuit and improve the startability of starting the cooling operation. Can be done.

In the disinfection storage of the embodiment, when the defrosting start condition is satisfied during the cooling operation, the control device 55 removes either the first solenoid valve 42 or the second solenoid valve 43 in advance. The first evaporator 32 and the second evaporator 33 alternately perform a defrosting operation in which the refrigerant is closed during the frost time and the supply of the refrigerant to the corresponding evaporators 32 and 33 is temporarily stopped. Let me. That is, when the supply of the refrigerant to either the first evaporator 32 or the second evaporator 33 is stopped, the air flows by the operation of the fan 12, and the refrigerant does not flow in the evaporators 32, 33. Defrosting is performed. This makes it possible to prevent the frost adhering to the evaporators 32 and 33 from growing significantly and reducing the cooling capacity of the evaporators 32 and 33. Further, even during defrosting of one evaporator 32, 33, the accommodation space 25 can be cooled by the cooling operation of the other evaporator 32, 33.

Here, when there is a request to start the tableware cart 15 from a predetermined scheduled time without immediately starting the heating operation after accommodating the tableware cart 15 in the storage space 25, conventionally, the worker disinfects at the scheduled time. There is a problem that it is necessary to go to the place where the storage is installed and manually start the heating operation, or forget to start the heating operation. However, since the disinfection storage of the embodiment is configured so that the heating operation and the cooling operation can be automatically started by the timer device 57, the burden on the operator can be reduced and the heating operation start operation can be performed. It is also possible to suppress forgetting. That is, when the tableware cart 15 is accommodated in the accommodation space 25, various start timer times are set in the timer device 57, and if the operation button is pressed to put the disinfection storage in the operation standby state, the disinfection storage is purposely performed at the scheduled time. There is no need to go to the place where the warehouse is installed. In addition, the heating operation and the cooling operation can be started at a time when the electricity rate is low, such as at night, without causing the operator to take time, and the electricity rate can be kept low. Further, in a facility or the like where noise during cooling operation is a problem depending on the time zone, it is possible to set the operation to be performed during a time zone when noise is not a problem. Furthermore, in a facility that uses multiple disinfection storages, if the heating start timer time and the cooling start timer time are set for each of the disinfection storages, the multiple disinfection storages can be stored in the determined order. It is not necessary for the operator to operate and start the heating operation, which can reduce the burden on the operator.

[Another Example]
6 to 9 show another embodiment of the disinfection storage, and the other embodiment will be described only in a portion different from the configuration of the embodiment. Further, the same members described in the examples shall be designated by the same reference numerals.

[First Alternative Example]
FIG. 6 shows a refrigerating apparatus 60 of the disinfection storage according to the first alternative embodiment, in which a confluence portion between the first outflow pipe 38a and the second outflow pipe 38b and the heat exchange portion are shown. An auxiliary condenser (load suppressing means) 61 is provided in the fourth connecting pipe 38 (refrigerant pipe 34) between the pipe and the 39. The auxiliary condenser 61 is arranged at a position where air flows by the operation of the condenser fan 50, and is configured so that the refrigerant flowing through the auxiliary condenser 61 can be cooled by the auxiliary condenser 61. That is, when the accommodation space 25 is at a high temperature during the cooling operation by the refrigerating device 60, the refrigerant that has been overheated by exchanging heat with the stored items in the evaporators 32 and 33 can be cooled by the auxiliary condenser 61, and the compressor. 28 overheating can be suppressed.

In the first alternative embodiment, a bypass circuit is added to bypass the auxiliary condenser 61 and supply the refrigerant flowing out from the evaporators 32 and 33 to the upstream side of the heat exchange unit 39, and to the bypass circuit. Provide an electromagnetic valve. Then, when the temperature sensor 26 in the refrigerator detects a preset low load temperature, the solenoid valve of the bypass circuit can be opened and controlled by the control device 55. The low load temperature may be a temperature at which a high load is not applied to the compressor 28 by the refrigerant returning from the evaporators 32 and 33 to the compressor 28. Further, in the first alternative embodiment, a dedicated fan for air-cooling the auxiliary condenser 61 may be provided, or the auxiliary condenser 61 may be water-cooled.

[Second Alternative Example]
FIG. 7 is a control block diagram of the disinfection storage according to the second alternative embodiment, and is an outside temperature sensor (storage) that detects the temperature of the outside (outside) of the box body 10 on the control device 55. External temperature detecting means) 56 is connected. Further, the control device 55 is connected to an end time setting means 62 such as a timer that can set the end time of the cooling operation by the refrigerating device 27 (for example, the time when the stored object is used). Then, in the control device 55, the current internal temperature is cooled by the calculation unit 63 based on the internal temperature detected by the internal temperature sensor 26 and the external temperature detected by the external temperature sensor 56. The cooling operation time required to reach the cooling completion temperature when the operation is performed is calculated, and the time calculated back from the end time set in the end time setting means 62 by the cooling operation time is updated as the start time of the cooling operation. When it is determined that the current time is the start time or the start time has passed, the refrigerating device 27 is configured to start the cooling operation. The control device 55 is configured so that the current time can be recognized by a timer (not shown), and the heating operation is started by pressing the operation button of the disinfection storage, and the temperature of the accommodation space 25 is set to the set temperature. The heating operation is terminated after the T is held for the heating time set in the built-in time measuring unit. Then, after the heating operation is completed, the cooling operation is started based on the cooling operation start process described later.

The storage unit 64 of the control device 55 has a cooling operation obtained by an experiment according to a relationship between known conditions such as the cooling capacity of the refrigerating device 27 and the capacity of the accommodation space 25, and the temperature inside and outside the refrigerator. Time information is stored. FIG. 8 shows an example of information on the cooling operation time obtained from the relationship between the temperature inside the refrigerator and the temperature outside the refrigerator, and FIG. 8 shows a case where the cooling completion temperature is set to 10 ° C. .. For example, if the internal temperature is 80 ° C and the external temperature is 10 ° C, the cooling operation time required to reach the cooling completion temperature is 180 minutes, ... The internal temperature is 40 ° C and the external temperature is 40 ° C. If the temperature is 30 ° C., the cooling operation time required to reach the cooling completion temperature is 300 minutes. The information shown in FIG. 8 is an example, and the temperature interval between the temperature inside and outside the refrigerator shown in FIG. 8 is not a 10 ° C. or 20 ° C. interval, but a cooling operation obtained based on a finer interval. It may be time information. Further, a calculation formula capable of calculating the cooling operation time based on the relationship between the known conditions, the inside temperature and the outside temperature is stored in the storage unit 64, and the inside temperature and the outside temperature are stored in the calculation formula. It is also possible to calculate the cooling operation time by substituting.

FIG. 9 is a flowchart showing a cooling operation start process executed by the control device 55 in another second embodiment. In the cooling operation start process, it is determined whether or not the heating operation is completed (step S10), and if the determination result in step S10 is negative, the cooling operation start process is terminated. If the determination result in step S10 is affirmative, the control device 55 proceeds to step S11. In step S11, the fan 12 is turned on, and the calculation unit 63 is based on the internal temperature detected by the internal temperature sensor 26 and the external temperature detected by the external temperature sensor 56. The cooling operation time required for the temperature inside the refrigerator to reach the cooling completion temperature is calculated based on the above information, and the time obtained by back-calculating the cooling operation time from the end time set in the end time setting means 62 is used as the cooling operation time. Set (stored in the storage unit 64). The fan 12 is turned off after a predetermined time (for example, 2 minutes).

In step S12, the control device 55 determines whether the current time has reached the start time set in step S11 or has passed the start time, and the determination result in step S12 is affirmative. For example, the process proceeds to step S16 to start the cooling operation. If the determination result in step S12 is negative, that is, the start time of the cooling operation set in step S11 has not been reached, the control device 55 waits until the start time is reached (step S13). Then, at the start time, the control device 55 turns on the fan 12 again, and at the calculation unit 63, based on the internal temperature and the external temperature detected by the internal temperature sensor 26 and the external temperature sensor 56, the control device 55 is currently turned on. The cooling operation time required for the temperature inside the refrigerator to reach the cooling completion temperature is calculated based on the above information, and the time obtained by back-calculating the cooling operation time from the end time set in the end time setting means 62 is calculated as the cooling operation time. Is updated and stored in the storage unit 64 (step S14). Further, the fan 12 is turned off after a predetermined time (for example, 2 minutes later).

Next, the process proceeds to step S15, and in step S15, the control device 55 determines whether or not the current time has reached the start time updated in step S14 or has passed the start time. If the determination result in step S15 is affirmative, the process proceeds to step S16 and the cooling operation is started. If the determination result in step S15 is negative, that is, the start time of the cooling operation updated in step S14 has not been reached, the control device 55 returns to step S13 and waits until the start time is reached. When the control device 55 starts the cooling operation, the control device 55 ends the cooling operation start process.

Here, when the cooling operation is terminated by manual operation (pressing the operation button) as in the embodiment, or when the time for continuing the cooling operation is set by the timer, the outside temperature is higher than the assumed temperature. The stored object may be cooled to the cooling completion temperature early due to factors such as a low temperature or a low temperature of the stored object at the start of the cooling operation. Even in this case, the cooling operation is continued until the cooling operation is terminated by manual operation or until the time for continuing the cooling operation set in the timer elapses, and the wasteful cooling operation increases the amount of electricity used. There is.

On the other hand, in the second alternative embodiment, the cooling operation time required to reach the cooling completion temperature when the current internal temperature is the cooling operation is calculated based on the internal temperature and the external temperature. Then, the time obtained by back-calculating the cooling operation time from the end time set in the end time setting means 62 is updated as the start time of the cooling operation, and the cooling operation is started from the updated start time. You can start from the optimal time. That is, since the cooling operation time can be changed to the minimum necessary length according to the change in the outside temperature and the temperature (inside temperature) of the stored material stored in the storage space 25, the freezing device 27 can be used. It is possible to prevent wasteful driving and reduce the amount of electricity used. In addition, since the cooling operation is waited until the updated start time is reached, it is not necessary to cool the amount of heat dissipated by the natural cooling during this standby, which has the effect of further shortening the cooling operation time. You can expect it. Further, before calculating the cooling operation time from the inside temperature and the outside temperature, the fan 12 is operated to make the temperature distribution inside the inside uniform, so that the inside temperature sensor 26 can be used to obtain an appropriate inside temperature. Can be detected.

[Change example]
The present application is not limited to the configurations of the above-described embodiments, and other configurations may be appropriately adopted.
(1) In the embodiment, the refrigerating device is configured to include two evaporators, but the number of the evaporators may be three or more. Further, in a configuration including three or more evaporators, the amount of refrigerant returned to the compressor may be reduced when the number of evaporators through which the refrigerant circulates is limited by the refrigerant temperature detected by the discharge side temperature sensor. It may be sufficient to stop the supply of the refrigerant to the plurality of evaporators at the same time.
(2) In the embodiment, the liquid bypass pipe is branched to supply the low-temperature liquefied refrigerant flowing out of the condenser to the fourth connecting pipe and the compressor. A configuration in which the liquefied refrigerant is supplied to only one of them can be adopted. That is, a configuration in which the first bypass pipe is omitted or the second bypass pipe is omitted in the embodiment can be adopted, and even in a configuration in which either the first bypass pipe or the second bypass pipe is omitted. , It is possible to prevent the temperature of the compressor from exceeding the upper limit value that can be operated normally.
(3) In the embodiment, a configuration in which the low-temperature liquefied refrigerant flowing out of the condenser is liquid-bypassed or liquid-injected is used in combination with a configuration in which the number of evaporators through which the refrigerant circulates is limited. Only one of the configurations can be adopted. That is, in the refrigerating apparatus of the embodiment, a configuration in which the liquid bypass pipe and the bypass valve are omitted or a configuration in which the first and second solenoid valves are omitted can be adopted.
(4) In the embodiment, the cooling operation is terminated by a manual operation, but the cooling time is set in the timekeeping part of the timer device, and when the cooling start timer time is reached, the cooling time is measured in the timekeeping part. It is possible to adopt a configuration in which the cooling operation is automatically terminated by starting the time and the time measuring unit measuring the cooling time. That is, it is possible to adopt a configuration in which the start and end of the heating operation and the start and end of the cooling operation are all controlled by the timer device. It is also possible to adopt a configuration in which the heating operation is started by a manual operation.
(5) In the embodiment, the time measuring unit constituting the timer device is provided in the control device, but a configuration in which the timing unit is provided in the timer setting unit can be adopted.
(6) In the second alternative embodiment, a dedicated end time setting means is connected to the control device, but if the timer device of the embodiment is configured so that the end time of the cooling operation can be set, the timer device is terminated. It can be used as a time setting means. Then, in the configuration in which the timer device is used as the end time setting means, when the cooling start timer time set by the timer device is reached, the current internal temperature is cooled based on the internal temperature and the external temperature. The cooling operation time required to reach the cooling completion temperature is calculated, and the time calculated back from the end time set in the timer device as the end time setting means by the cooling operation time is calculated as a new cooling start timer. It can be configured to update as a time.
(7) The expansion means is not limited to the expansion valve and may be a capillary tube or the like.
(8) For each configuration described in each of the examples and modifications, a combined configuration may be adopted within the scope of the gist of the present invention.

11 heater, 12 fan, 26 internal temperature sensor (internal temperature detecting means)
27 Refrigerator, 28 Compressor, 29 Condenser, 30 First expansion valve (expansion means)
31 2nd expansion valve (expansion means), 32 1st evaporator (evaporator), 33 2nd evaporator (evaporator)
36 2nd connection pipe (fluid pipe), 38 4th connection pipe (fluid pipe), 39 Heat exchange part 42 1st solenoid valve (switching valve), 43 2nd solenoid valve (switching valve), 48 Bypass valve 49 Liquid bypass pipe, 49b 2nd bypass pipe (bypass pipe)
51 Discharge side temperature sensor (discharge side temperature detection means), 55 Control device 56 Outside temperature sensor (outside temperature detection means), 57 Timer device, 61 Auxiliary condenser 62 End time setting means

Claims (13)

In the disinfection storage, where the stored items stored in the storage are disinfected and dried by heating with the heated air generated by the heater (11) and fan (12).
A freezer (27) in which a compressor (28), a condenser (29), an expansion means (30,31) and an evaporator (32,33) are connected so that the refrigerant circulates in this order is provided.
The refrigerating apparatus (27) has a plurality of the evaporators (32,33) capable of exchanging heat with the air inside the refrigerator.
Discharge side temperature detecting means (51) for detecting the temperature of the refrigerant discharged from the compressor (28), and
The heater (11), the fan (12), and the control device (55) for controlling the refrigerating device (27) are provided.
The control device (55) suppresses the load on the compressor (28) based on the refrigerant temperature detected by the discharge side temperature detecting means (51) during the cooling operation by the refrigerating device (27). A disinfection storage that is configured to control the refrigeration system (27). The disinfection storage according to claim 1, wherein the evaporator (32, 33) is arranged at a position where air flows by the operation of the fan (12). One end is connected to the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32,33), and the other end is the refrigerant connecting the evaporator (32,33) and the compressor (28). The liquid bypass pipe (49) connected to the pipe (38) and
A bypass valve (48) inserted in the liquid bypass pipe (49) is provided.
When the refrigerant temperature detected by the discharge side temperature detecting means (51) during the cooling operation by the refrigerating device (27) is a high load temperature for refrigerant bypass, the control device (55) has the bypass valve (48). ) Is opened, and the refrigerant condensed by the condenser (29) is connected to the evaporator (32, 33) and the compressor (28) via the liquid bypass pipe (49). The disinfectant storage according to claim 1, which is configured to bypass the above. A liquid bypass pipe (49) having one end connected to the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32, 33) and the other end connecting to the compressor (28).
A bypass valve (48) inserted in the liquid bypass pipe (49) is provided.
When the refrigerant temperature detected by the discharge side temperature detecting means (51) during the cooling operation by the refrigerating device (27) is a high load temperature for refrigerant bypass, the control device (55) has the bypass valve (48). ) Is opened, and the refrigerant condensed by the condenser (29) is bypassed to the compressor (28) via the liquid bypass pipe (49). One end is connected to the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32,33), and the other end is connected to the evaporator (32,33) and the compressor (28). The liquid bypass pipe (49) connected to the refrigerant pipe (38) and
A bypass valve (48) inserted in the liquid bypass pipe (49) and
The liquid bypass pipe (49) is provided with a bypass pipe (49b) that branches from the downstream side of the bypass valve (48) and connects to the compressor (28).
When the refrigerant temperature detected by the discharge side temperature detecting means (51) during the cooling operation by the refrigerating device (27) is a high load temperature for refrigerant bypass, the control device (55) has the bypass valve (48). ) Is opened, and the refrigerant condensed by the condenser (29) is connected to the refrigerant pipe (38) and the compressor (28) via the liquid bypass pipe (49). The disinfectant storage according to claim 1, which is configured to bypass the compressor (28). When the refrigerant temperature detected by the discharge side temperature detecting means (51) during the cooling operation by the refrigerating device (27) is a high load temperature for adjusting the refrigerant, the control device (55) has the plurality of evaporators. One of the on-off valves (42,43) provided on the inlet side of the refrigerant in (32,33) was closed to limit the number of evaporators (32,33) through which the refrigerant circulates. The disinfectant storage according to any one of claims 1 to 5. The refrigerant flowing through the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32, 33), and the refrigerant pipe (38) connecting the evaporator (32, 33) and the compressor (28). The disinfection storage according to any one of claims 1 to 6, provided with a heat exchange unit (39) for exchanging heat with the refrigerant flowing through). The control device (55) opens and closes on the inlet side of the refrigerant in the plurality of evaporators (32, 33) when the defrosting start condition is satisfied during the cooling operation by the refrigerating device (27). Multiple evaporators (32,33) sequentially perform defrosting operation in which the valve (42,43) is closed and the supply of refrigerant to the evaporator (32,33) is stopped during the defrosting time. The disinfectant storage according to any one of claims 1 to 7, which is configured to be able to be carried out. The control device (55) is provided in the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32, 33) after the condition for terminating the cooling operation by the refrigerating device (27) is satisfied. The disinfection storage according to any one of claims 1 to 8, which is configured so that the pump-down operation for driving the compressor (28) can be performed with the on-off valve (42,43) closed. .. The control device (55) is attached to the refrigerant pipe (36) connecting the condenser (29) and the evaporator (32, 33) before starting the heating operation for disinfecting and drying the stored material with the heated air. The disinfectant storage according to any one of claims 1 to 9, which is configured so that the pump down operation for driving the compressor (28) can be performed with the provided on-off valve (42,43) closed. Warehouse. The invention according to any one of claims 1 to 10, further comprising a timer device (57) for controlling the end of the heating operation for disinfecting and drying the stored material with the heated air and the start of the cooling operation by the refrigerating device (27). Disinfection storage. The disinfection storage according to any one of claims 1 to 11, wherein an auxiliary condenser (61) is provided in a refrigerant pipe (38) connecting the evaporator (32, 33) and the compressor (28). .. An end time setting means (62) capable of setting the end time of the cooling operation by the refrigerating device (27), and
It is equipped with an internal temperature detecting means (26) for detecting the temperature inside the refrigerator and an external temperature detecting means (56) for detecting the temperature outside the refrigerator.
The control device (55) has the internal temperature and the internal temperature detected by the internal temperature detecting means (26) and the external temperature detecting means (56) after the heating operation for disinfecting and drying the stored object with the heated air is completed. Based on the outside temperature, the cooling operation time required to reach the cooling completion temperature when the current inside temperature reaches the cooling completion temperature is calculated, and from the end time set in the end time setting means (62). The time calculated back by the cooling operation time is updated as the start time of the cooling operation.
The control device (55) is configured to start the cooling operation by the refrigerating device (27) when it is determined that the current time is the start time or the start time has passed. Disinfection storage according to any one of 12 items.

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