JP2889602B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a low-temperature storage that cools a storage room while cooling a regenerator.

2. Description of the Related Art A refrigerator equipped with a regenerator having an internal cooler and a refrigerating cooler has a regenerator disposed in an insulated box.
There is JP-A-62-210369. In this publication, during the period until the refrigerating agent is frozen, the operation of the compressor is controlled to forcibly drive the compressor irrespective of the opening / closing operation of the temperature control device for maintaining the temperature in the refrigerator at the set temperature. Such a technique is disclosed.

According to the conventional technique, a cooler for cooling the inside of the refrigerator and a cooler for freezing the cold storage agent are connected in series, and if the operation of the compressor is stopped, the cooler inside the refrigerator is cooled. To stop the cooling of the refrigerator and the cooling of the cold storage agent by the freezer cooling device.
The compressor is kept running until the regenerator freezes. However, in order to freeze the refrigerating agent in addition to freezing the refrigerating agent in preference to the temperature in the refrigerator, it is impossible to control the temperature in the refrigerator until the refrigerating agent is frozen. . For this reason, freezing the regenerator while maintaining the internal temperature at the temperature in the ice temperature range where the control temperature range is particularly narrow and strict temperature control of about ± 0.5 ° C with respect to the set temperature is required There was a problem that could not be done.

In view of the above, the present invention provides a low-temperature refrigerator that cools the inside of the refrigerator while freezing the regenerator and reduces the amount of frost formed on the evaporator per unit time to reduce the number of times of defrosting.

[Configuration of the invention]

Means for Solving the Problems The present invention provides a refrigerating agent in a freezing chamber that is frozen by cold air cooled by an evaporator, and partitions the cold air cooled by the refrigerating agent from the freezing chamber with a circulating blower. A cold air circulation path forcibly circulating the cooled storage chamber, a cold air bypass path for returning the cool air cooled by the evaporator and cooling the refrigerating agent in the freezing chamber to the evaporator and leading the cold air again to the regenerator, and the cold air circulation. A suction port for sucking air from the storage chamber sucked from the storage chamber into the freezing chamber on the road; and a partition plate for preventing the air in the storage chamber sucked from the suction port from moving to the evaporator side. This is to provide a low-temperature storage.

According to the low-temperature storage, the cold air cooled by the regenerator is divided into a cool air circulation path forcibly circulating the storage chamber and a cool air bypass path returning to the evaporator. The storage room can be cooled while performing. In addition, by providing a partition plate to prevent the air in the storage room sucked from the suction port from moving to the evaporator side, the amount of frost on the evaporator per unit time is reduced, and the number of times of defrosting is reduced. Can be achieved.

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

Reference numeral 1 denotes a refrigerator serving as a low-temperature refrigerator, and in this example, a refrigerator called a cold roll box used for transporting articles while carrying the articles on a transport vehicle such as a truck while cooling the articles. Will be described as an example.

The refrigerator 1 is provided with a moving wheel 2 at the bottom thereof, and has an insulating box 4 having an opening 3 formed on one side and an insulating door 6 for opening and closing the opening 3. Freezing room 7 partitioned by plate 6 and specification selection room 8 as storage room
Has been arranged.

In the freezing chamber 7, an evaporator 10, a plurality of air blowers 11, and an article storage section 12 as a cold storage agent storage section for storing the cold storage agent 12B are arranged. The blower 11 is an AC power supply in this example. It comprises two driven air blowers 11A for the evaporator and one air blower 11B for air circulation in the refrigerator driven by a DC power supply. Then, the air blowing amount of each of the air blowing devices 11A and 11B is set to be substantially the same. One end is opened to the leeward side of the article storage section 12 along one wall of the freezing chamber 7, that is, the top wall 13, and the other end is an evaporator.
A duct 14 opened on the windward side of 10 is arranged to form a cool air bypass passage B parallel to a cool air circulation passage C described later.

Reference numeral 15 denotes an outlet formed in a portion of the partition plate 6 located on the leeward side of the article storage section 12, and reference numeral 16 denotes a suction port formed in the partition plate 6 corresponding to the air circulation fan 11B.
Then, the cool air that has passed through the cold storage agent 12B of the article storage unit 12 is guided from the outlet 15 into the specification selection chamber 8, and a cool air circulation path C that returns the air to the article storage 12 from the suction port 16 is formed.

In addition, the air passing through the evaporator 10 is prevented from being sucked into the evaporator-side portion of the in-compartment air circulation blower 11B, and the air in the specification selection chamber 8 sucked from the suction port 16 is sent to the evaporator side. A partition plate 17 for preventing movement is provided. In addition, since the blowing air capacity of each of the blowers 11A and 11B is the same, the amount of air sucked from the suction port 16 by the internal circulation blower 11B is guided to the air inlet side of the evaporator 10 through the duct 14. The ratio of the amount of air taken is approximately 1: 2, and the latter, that is, the amount of air passing through the cool air bypass B can be increased.

Reference numeral 18 denotes a middle door made of a transparent material for opening and closing the article entrance formed on the front surface of the article storage section 12.

Reference numeral 20 denotes a machine room for storing a compressor, a condenser, a blower for the condenser, and the like.

Next, the operation control device K for the low-temperature storage will be described with reference to FIG.

L is an AC circuit section, M is a DC circuit section, 30 is a three-phase AC power supply, and 34 is a compressor drive motor connected to power supply lines 31-33.

35 is an AC-DC converter, 36 is a first relay coil, 37 is an AC fan motor of a blower 11A for an evaporator, 38 is an AC fan motor of a blower for a condenser, and 39 and 40 are first switches of a magnet coil 52C. And a second switch.

41 detects the temperature in the article storage section 12 and controls the operation / stop of the compressor drive motor 34 based on the detected temperature to control the freezing chamber 7.
Is a freezing room temperature control unit as a first control unit that holds the article storage unit 12 at a first temperature, one of which is −15 ° C.
The other is a freezing temperature of −5 ° C .;
In the present embodiment, one of the two types of cold storage agents having different freezing temperatures is stored in the article storage unit 12 and is adjusted to the freezing temperature of the selected cold storage agent. Thus, the temperature in the article storage section 12 can be controlled to two temperatures. That is, the reference numeral 42 indicates that the freezing agent for freezing is frozen by 10 ° C from the freezing temperature (−15 ° C.) of the cooling agent.
A first thermostat 43 for controlling the inside of the article storage unit to a temperature lower by ℃ (-25 ° C), 43 is for freezing the cold storage agent for ice temperature refrigeration.
A second thermostat 44 for controlling the temperature to be lower by 10 ° C. (−15 ° C.), 44 is connected in series to the first thermostat 42 and a switch of a second relay coil 60 described later, 45 and 46 are connected in parallel to each other and These switches are connected in series, and correspond to a third relay coil 61 and a fourth relay coil 62, respectively, which will be described later.

The DC circuit section M is connected to the output side of the AC-DC converter 35, and a storage battery 50 is connected to the AC-DC converter 35 via the switch 51 of the first relay coil 36 and can be charged and discharged. .

Numeral 52 indicates the temperature in the specification selection room 8 as a freezing temperature (for example, -10 ° C or less), an ice temperature (about -5 ° C to 0 ° C), and a refrigeration temperature (1 ° C).
(Approximately 10 ° C.) as an operation section as a temperature setting section for selecting an arbitrary temperature, and based on a state selected by the operation section 52, as a second control section disposed at an appropriate place in the specification selection room 8. By operating the storage room temperature control unit 53, the operation / stop of the internal circulation blower 11B is controlled. 57 is a DC fan motor, and 58 is a controller for controlling the number of rotations and the direction of rotation of the DC fan motor 57. However, in the present embodiment, the controller 58 rotates the fan motor 57 in the same direction at the same rotation speed.

As the storage room temperature control unit 53, the inside of the specification selection room 8 is the first
The refrigeration thermostat 54 for maintaining the refrigeration temperature corresponding to the temperature of, for example, -15 ° C. The ice temperature as the second temperature higher than the first temperature, for example, the ice temperature thermostat 55 for maintaining the temperature at 0 ° C. The refrigeration thermostat 56-3 for maintaining the refrigeration temperature as a third temperature higher than the temperature, for example, 5 ° C.
One of them is prepared, and one of the thermostats is selected by the selection operation of the operation unit 52, and the specification selection room 8 is maintained at the temperature according to the selection.

Reference numeral 59 denotes a relay group in which the storage room temperature controller 53 is connected in parallel to a series circuit with the internal circulation blower 11B, and 60
Is a second relay coil corresponding to the thermostat 54 for freezing, 61 is a third relay coil corresponding to the thermostat 55 for ice temperature, and 62 is a fourth relay coil corresponding to the thermostat 56 for refrigeration.

Further, in the present embodiment, an example is shown in which each of the temperature control units 41 and 53 is constituted by a thermostat. However, a thermistor is disposed in each of the freezing room 7 and the specification selection room 8, and a detection signal from each thermistor and the operation unit 52 are provided. Set temperature (for details,
The operation / stop of the compressor drive motor 34 and the internal circulation blower 11B may be controlled in accordance with one of refrigeration and ice temperature.

The cooling of the freezing chamber 7 and the specification selecting chamber 8 based on the above configuration will be described. However, it is assumed that the insides of both chambers 7 and 8 are not cooled.

If the refrigeration temperature is selected by the operation unit 52, the refrigeration thermostat 54 is selected by this selection operation. Then, when a cooling operation switch (not shown) is pressed or a power outlet is inserted into a socket (both not shown), the first relay coil 36 is energized and the switch 51 is closed to blow air for charging and circulating the storage battery 50. The device 11B and the second relay coil 60 are energized, and the magnet coil 52C is energized to energize the compressor drive motor 34 and the AC fan motors 37 and 38, respectively, to start operation. For this reason, the inside of the article storage section 12 is gradually cooled by the air cooled through the evaporator 10, and freezes the regenerator 12B. The interior of the specification selection chamber 8 is gradually cooled by the operation of the circulation blower 11B with the latent heat of fusion of the regenerator 12B.

At this time, the cool air guided to the leeward side of the cold storage agent 12B of the article storage section 12 enters the specification selection chamber 8 from the outlet 15 and the suction port.
A path that returns from 16 to the article storage section 12, that is, a path that flows through the cool air circulation path C (hereinafter referred to as a cool air flow (A)), and returns to the windward side of the evaporator 10 via the duct 14 and is returned to the evaporator 10. The air is cooled and returned to the article storage room 12, that is, the air flows into the cold air bypass path B (hereinafter, referred to as a cold air flow (a)).

In addition, in this split flow, as described above, the amount of air in the cold air flow (a) is large, and the cold air can be directly introduced into the evaporator 10 with little heat exchange after passing through the regenerator 12B. The temperature rise of the air returning to 10 is suppressed. Therefore, the heat exchange capacity of the evaporator 10 can be blown onto the regenerator 12B as lower-temperature cold air without deteriorating the heat exchange capacity, and the cooling efficiency of the regenerator 12B is improved, which is higher than that of the conventional forced convection type. The time required for freezing the cold storage agent can be reduced.

When the temperature drops below the opening operation temperature of the thermostat 54 (set to -16 ° C. in this example), the contact is opened, the circulation blower 11B stops, and the forced convection of cold air in the specification selection chamber 8 stops. When the forced convection of the cool air in the specification selection chamber 8 stops, the forced cooling in the specification selection chamber 8 is not performed, and the temperature gradually increases. When the temperature reaches the return operation temperature of the thermostat 54 (−14 ° C. in this example), the contact of the thermostat 54 closes, and the internal circulation blower 11B starts operating again.
The specification selection chamber 8 is cooled by forced convection. Hereinafter, the above operation is repeated to maintain the specification selection chamber 8 at the freezing temperature.

Note that when the ice temperature or the refrigeration temperature is selected by the operation unit 52, the operation is performed by replacing the refrigeration temperature and the refrigeration temperature in the above-described operation with “ice temperature / ice temperature” or “refrigeration temperature / refrigeration”. Therefore, the description is omitted. However, since the temperature relationship is frozen <ice temperature <refrigerated, the difference in the operating temperature of each thermostat corresponding to this temperature relationship indicates that the higher the control temperature, the longer the interval between the start and stop of the circulation blower 11B. Is shortened, and as a result, the blowing amount of the blowing device is reduced.

On the other hand, since the cool air is guided from the outlet side of the article storage section 12 to the air inlet side of the evaporator 10 through the duct 14, the duct 14 acts as a cool air bypass passage, and cools the article storage section 12. Promoted. Particularly, since the flow rate of the cool air according to (a) is made larger than the flow rate of the cool air according to (a), the cooling of the article storage unit 12 is promoted. Further, since the cool air according to (a) returns to the evaporator 10 without passing through the storage room 8,
Since the air returns at a relative temperature lower than the cool air according to (a), the amount of frost formed on the evaporator 10 per unit time is reduced, and the number of times of defrosting can be reduced.

When the article storage section 12 is gradually cooled and becomes lower than the opening operation temperature of the first thermostat 42 (set to -26 ° C. in this example), the contact is opened and the compressor drive motor 34 is stopped to freeze. The cooling of the freezing chamber 7 is prevented by stopping the cooling of the freezing chamber 7. However, the blower 11A for the evaporator continues to operate because the AC fan motor 37 is energized.
When the temperature of the inside of the article storage chamber 12 gradually rises due to the stoppage of the cooling and becomes equal to or higher than the return temperature of the first thermostat 42 (set to −24 ° C. in this example), the contact is closed and the compressor is driven again. Then, the freezing chamber 7 is cooled. Thereafter, the above operation is repeated to maintain the inside of the article storage room 12 at a temperature lower than the freezing temperature of the refrigerating agent for freezing (-25 ° C. in this example).

When the ice temperature or the refrigeration temperature is selected by the operation unit 52, the first operation in the above-described operation in the freezing chamber is performed.
If it is considered that the operation is performed by replacing the thermostat with the second thermostat, the description will be omitted.

[Effect of the Invention] As described in detail above, according to the low-temperature storage of the present invention, the cold air cooled by the regenerator is forcibly circulated to the cold air circulation passage for returning to the evaporator and the cool air circulation passage for returning to the evaporator. By doing so, it is possible to cool the storage room while freezing the regenerator. In addition, by providing a partition plate to prevent the air in the storage room sucked from the suction port from moving to the evaporator side, the amount of frost formed on the evaporator per unit time is reduced, and the number of times of defrosting is reduced. Can be achieved.

[Brief description of the drawings]

Each drawing shows an embodiment of the present invention, FIG. 1 is an operation control device for a low-temperature storage, FIG. 2 is an external perspective view of the low-temperature storage, FIG. 3 is a cross-sectional view of a freezing compartment, and FIG. AA sectional view of FIG.
FIG. 5 is a schematic sectional view showing the flow of cool air in the low-temperature storage. 1 ... refrigerator, 7 ... freezing room, 8 ... storage room, 10 ... evaporator, 11
B ... Blower for circulation, 12B ... Cooling agent, B ... Cool air bypass, C ... Cool air circulation, K ... Low-temperature storage operation control device, 16 ...
Suction port, 17: partition plate, 34: compressor, 41: first control unit, 52
... temperature control unit, 53 ... second control unit.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25D 11/00 101 F25D 16/00

Claims (1)

(57) [Claims] 1. A refrigerating agent in a freezing room which is frozen by cold air cooled by an evaporator, and cold air cooled by the refrigerating agent is forced by a circulation blower into a storage room separated from the freezing room. A cool air circulation path to be circulated; a cool air bypass path for returning the cool air cooled by the evaporator and cooling the regenerator in the freezing chamber to the evaporator and guiding the cool air again to the regenerator; A low-temperature refrigerator comprising: a suction port for sucking air from a storage chamber into a freezing chamber; and a partition plate for preventing the air from the storage chamber sucked from the suction port from moving toward the evaporator.