JPH03158681A - Low temperature chamber - Google Patents

Abstract

PURPOSE:To enable control of temperature in a storage chamber without exchanging a heat regenerative agent by a method wherein means for selecting temperatures in the storage chamber and a freezing chamber among a plurality of operation modes at each chamber is provided and plural kinds of heat regenerative members having freezing temperatures matching respective operation modes are provided in the freezing chamber. CONSTITUTION:A freezing chamber 7 and a specification selecting chamber 8 serving as a storage chamber partitioned from the freezing chamber by means of a partition plate 2 are arranged in a low temperature chamber 1. A vaporizer 10, a plurality of blower devices 11, and an article containing part 12 containing a heat regenerative agent are arranged in the freezing chamber 7. Cold air passing heat regenerative agents 12A and 12B in the article containing part 12 is guided through a discharge port 15 to the specification selecting chamber 8 to form a cold air circulating passage Q in which cold air is returned through a suction port 16 to the article containing part 12. A freezing chamber temperature control part 41 detects temperature in the article containing part 12, and based on the temperature, operation and the stop of a compressor drive motor 34 are controlled to hold the article containing part 12 at a freezing temperature. Temperature in the article containing part 12 is controlled to temperature in response to an operation mode, selected by an operation part selecting means 52, according to the freezing temperature of the heat regenerative agent 12A for freezing and the heat regenerative agent 12B for ice temperature refrigeration.

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial Application Field The present invention is directed to the cooling of a freezing room and a storage room that is maintained at one of the temperature ranges of freezing, refrigeration, and ice temperature. Regarding low temperature storage at the same time.

2. Japanese Unexamined Patent Publication No. 1-102269 discloses a conventional cold storage type cold storage box containing a cold storage agent and a cooler. Publication No. (2) discloses a cold storage body consisting of a cold storage chamber containing a cooler containing a cold storage agent, a defrosting heater, and an air supply fan, and a cold storage chamber for keeping transported goods such as food cold; an insulating partition wall that partitions the cold storage room and the cold storage room and provides ventilation holes and a ventilation fan;
This disclosure discloses that the cold storage chamber of the cold storage main body is equipped with a freezer unit installed in the refrigerator.

In addition, we also provide freezer compartment specifications, chilled compartment specifications, and refrigerator compartment specifications (
It is equipped with a specification selection chamber that can be selected and set to one of the following temperature ranges (freezing, chilled, and refrigeration), and a switching chamber that can be switched to either the rapid cooling chamber specification or other specifications. Japanese Patent Laid-Open No. 1987-82-- In a system in which cold air is supplied to the specification selection chamber and the switching chamber through the cold air supply duct, and the amount supplied to the specification selection chamber and the switching chamber is controlled according to the respective set specifications. There is a publication No. 255777. In the publication (2), when the switching chamber is set to the quenching chamber specification, the supply of cold air to the specification selection chamber is stopped.

Problem to be Solved by the Invention The freezing temperature of the cold storage agent stored in the cold storage chamber in the technique (2) above is -Ml class, and this is one of the operation modes out of a plurality of operation modes in which the inside of the cold storage chamber is divided into temperature zones. In order to select and control the temperature, it is necessary to replace the cold storage agent with one having a freezing temperature corresponding to the selected operation mode, which is very troublesome.

In addition, the weight of the cold storage agent depends on the length of time it is kept cold, and it is very troublesome and hard work for the user to put in and take out the frozen cold storage agent, and there is a problem that the user cannot continue the work for a long time. Ta.

On the other hand, in the technology (■) above, cold air is supplied to the specification selection room and the switching room through a common cold air duct, and when the switching room is set to the quenching room specification, the supply of cold air to the specification selection room is stopped. Because of this, it is not possible to control the temperature of the specification selection room when using the quenching room specification.Therefore, when using the quenching room specification, although the specification selection room can be used as an article storage room, it is not possible to control the temperature of the specification selection room. There was a problem that it could not be used as a cooling storage room.

Therefore, in the present invention, when controlling the temperature of the storage room, it is necessary to replace the cold storage agent with a cold storage agent according to the selected operation mode, thereby providing a low-temperature storage.

[Structure of the invention]

Means for Solving the Problems The present invention provides a storage room and a freezing room that are separated by a partition plate placed inside the refrigerator and communicated through an air outlet and a suction port, and an evaporator and a blower device placed in the freezing room. , selection means for selecting the temperature of each of the storage compartment and the freezing compartment into a plurality of operating modes divided into temperature zones for each compartment, and a plurality of types of operating modes stored in the freezing compartment and having freezing temperatures matching the operating modes The present invention provides a low-temperature refrigerator equipped with a cold storage member.

By selecting the operating mode divided by the operating temperature range, the temperature of the storage compartment and the freezing compartment is controlled to the desired temperature. Since a cold storage agent having a freezing temperature corresponding to the operating mode is stored, there is no need to replace the cold storage agent every time the selection is changed, and the desired cold storage temperature can be obtained simply by operating the selection means.

Example Embodiments of the present invention will be described below based on the drawings.

1 is a low-temperature storage, and in this example, a mobile low-temperature storage called a cold roll box, which is used when transporting articles while cooling them on a transport means such as a truck, will be described as an example.

The low-temperature refrigerator 1 is equipped with wheels 2 for movement at the bottom, has an insulating box 4 with an opening 3 formed on the side, and an insulating door 5 that can open and close the opening 3. , a freezer compartment 7 separated by a partition plate 6 and a specification selection compartment 8 serving as a storage compartment.
are placed.

The freezer compartment 7 includes an evaporator 10, a plurality of blowers 11,
An article storage section 12 as a cold storage agent storage section that stores the cold storage agents 12A and 12B is arranged. The blower device 11 is
Two evaporator blowers 1 driven by an AC power source 30
1A, and one internal air circulation blower device 11B driven by a DC power supply 35 or 50. Note that the amount of air blown by each of the air blowers 11A and 11B is set to the road width. In addition, a duct 14 is provided along the suction or ceiling wall 13 of the freezer compartment 7, and has one end opened on the leeward side of the article storage section 12 and the other end opened on the windward side of the evaporator IO. A cold air bypass path P is formed in parallel with the cold air circulation path Q.

Reference numeral 15 indicates an air 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 indicates a suction port formed in the partition plate 6 in correspondence with the blower device 11B for internal air circulation. Then, the cold storage agents 12A and 12 in the article storage section 12
A cold air circulation path Q is formed in which the cold air that has passed through B is guided into the specification selection chamber 8 from the blow-off port 15 and returned to the article storage section 12 from the suction port 16.

The evaporator side portion of the internal air circulation blower device 11B is designed not to suck in the air that has passed through the evaporator IO, and also to direct the air from the specification selection chamber 8 sucked in through the suction port 16 to the evaporator side. In order to prevent it from being moved, an opening is opened toward the cool storage agent 12B side at 6 to cover the circulation air blower 11B so as to separate the evaporator air blower +1A from the circulation air blower 11B. Partition board 17 as a partition wall with a function like a fan casing
is placed. Moreover, each blower device 11A.

Since the blown air capacity of 11B is the same, the amount of air sucked in by the internal circulation blower 11B from the suction port 16 is
The ratio of the amount of air guided to the air inlet side of the evaporator 10 via the duct 14 is approximately 1:2, and the latter, that is, the amount of air passing through the cold air bypass path P can be increased.

As a result, mainly freezing cold storage agents +2A and 12B,
It is possible to carry out a cooling operation with secondary cooling of the specification selection chamber 8, and it is also possible to shorten the freezing time of the cold storage agent.

Reference numeral 18 denotes an inner door made of a transparent material that freely opens and closes the cold storage agent entrance/exit 19 formed on the front surface of the article storage section 12 .

A machine room 20 houses a compressor, a condenser, a blower for the condenser, and the like.

Next, the operation control device K of the low-temperature refrigerator will be explained based on FIG. 5.

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

35 is an AC-DC converter as a charger that converts AC into DC and obtains the voltage necessary for charging the storage battery 50, which will be described later;
6 is the first relay coil, 37 is the evaporator blower +1A
38 is an AC fan motor of the condenser blower, 39. 40 is a first switch and a second switch of the magnet coil 52G.

41 detects the temperature inside the article storage section 12, controls the operation/stop of the compressor drive motor 34 based on the detected temperature, and adjusts the article storage section 12 in the freezer compartment 7 to a freezing temperature as a first temperature (e.g. -10°C or below), and in this example, two types of cold storage agents with different freezing temperatures (one at 125°C and the other at 15°C) are used. The former is the temperature of the freezing cold storage agent 12A,
The latter is referred to as cold storage agent 12B for water temperature refrigeration and is distinguished from the others).
It shall be stored in 2. In FIG. 1, three cold storage agents 12A and 12B are arranged one after the other. Then, the temperature inside the article storage section 12 is adjusted to the operating section 5 according to the freezing temperature (that is, the melting temperature) of the cold storage agent.
The temperature can be controlled to correspond to the operating mode according to No. 2.

In order to freeze the refrigerating cold storage agent 12A, 42 controls the inside of the article storage section to a predetermined temperature (for example, 10° C. lower (-35° C.) than the freezing temperature of this cold storage agent (-25° C.). Thermostat, 43 is cold storage agent 12 for ice temperature refrigeration
In order to freeze B, a second thermos controls the inside of the article storage section 12 to a temperature (-15°C) lower by a predetermined temperature [for example, 10°C] than the freezing temperature (-5°C) of this cold storage agent. 44 is a switch for a second relay coil 60 which is connected in series to the first thermostat 42 and will be described later; 45.46
are switches that are connected in parallel to each other and connected in series to the second thermostat 42, and are connected to third relay coils 61 . . . , which will be described later. It corresponds to the fourth relay coil 62. The cold storage agents 12A and 12B are water-ethylene glycol-
Examples include solutions of thickeners and solutions of natural carbohydrates, inorganic salts, edible preservatives, and edible coloring agents.

The DC circuit section M is connected to the output side of the AC-DC converter 35, and 50 is a charging/discharging DC power source connected to the AC-DC converter 35 via the switch 51 of the first relay coil 36. This is a possible storage battery.

52 sets the temperature in the specification selection chamber 8 to the temperature at which stored items freeze, that is, (1) freezing temperature (e.g. -10°C or lower).0
°C or below and just before freezing the stored material, i.e. (
Select the operating mode to control the desired temperature from 2) ice temperature (approximately -5°C to 0°C) and (3) refrigeration temperature (approximately 1°C to 10°C). This is an operation section as a selection means. Based on the selection state (i.e., operation mode (1) to (3)) by the operation unit 52, the storage room temperature control unit 53 as a temperature control device placed at an appropriate location in the specification selection chamber 8 is operated to The amount of air blown per unit time is controlled by controlling the operation and stopping of the air circulation blower 11B.

57 is a DC fan motor, 58 is a DC fan motor 57
This is the tζth controller that controls the zero rotation speed and rotation direction. In this embodiment, it is assumed that the controller 58 rotates the DC fan motor 57 in the same direction and at the same rotation speed.

As the storage room temperature control section 53, the inside of the specification selection room 8 is
A refrigeration thermostat 54 maintains a refrigeration temperature corresponding to the temperature of, for example, -15°C; a second temperature higher than the first temperature;
Ice temperature thermostat 55. to maintain the ice temperature at, for example, 0°C. Three refrigeration thermostats 560 that maintain a refrigeration temperature as a third temperature higher than the second temperature, for example, 5°C, are prepared, and one of the thermostats is selected by a selection operation using the operation unit 52, and the circulating air is turned on. The device 11B (specifically, the amount of air blown) is controlled to maintain the specification selection chamber 8 at a temperature corresponding to the selection.

Reference numeral 59 connects the storage room temperature control section 53 to the internal circulation air blower 11.
A group of relays connected in parallel to the series circuit with B, 60 is a second relay coil corresponding to the refrigeration thermostat 54, 61 is a third relay coil corresponding to the water temperature thermostat 55, and 62 is a refrigeration coil. thermostat 5
6 is the fourth relay coil tζ.

Further, although this example shows an example in which each temperature control section 41.53 is configured with a thermostat, a thermistor is arranged in each of the freezing compartment 7 and the specification selection compartment 8, and the detection signal from each thermistor and the operation part 52 are According to the set temperature (for example, any one of freezing, refrigeration, and ice temperature), the compressor drive motor 34 and the internal circulation blower device 11B may be controlled to operate or stop.

Temperature control of the freezing chamber 7 and the specification selection chamber 8 will be explained based on the above configuration. However, it is assumed that the inside of the compartment 7°8 is not cooled.

When the refrigeration temperature [operation mode (1)] is selected using the operation unit 52, the refrigeration thermostat 54 is selected by this selection operation. Then, press the cooling operation switch (not shown) or insert the power plug into the socket (and
(not shown), the first relay coil 36 is energized, the switch 51 is closed, and the storage battery 50 is charged and the circulating air blower 11B and the second relay coil 60 are energized, and the magnet coil 36 is energized. 52G is energized, and the compressor drive motor 34/AC fan motor 37.3
8 is energized and each starts operating. For this reason,
The interior of the article storage section 12 is gradually cooled by air cooled through the evaporator IO, freezing the cold storage agents 12A and 12B, respectively.The interior of the specification selection chamber 8 is also equipped with a circulating air blower 11.
By the operation of B, the cold storage agents 12A and 12B are gradually cooled down by the latent heat of fusion.

At this time, the cold air that has been led to the leeward side of the cold storage agent 12B in the article storage section 12 enters the specification selection chamber 8 from the outlet 15 and returns to the article storage section 12 from the suction port 16, that is, the cold air circulation path. Q (hereinafter referred to as cold air flow (A)), and a path that returns to the windward side of the evaporator IO through the duct 14, is cooled in the evaporator IO, and returns to the article storage section 12, that is, a cold air bypass path P. It is divided into 6 (hereinafter referred to as cold air flow (a)) flowing through the air.

Moreover, in this branching, as mentioned above, the amount of air in the cold air flow (a) is large (and, after passing through the cold storage agent 12B, it is difficult to introduce the cold air directly into the evaporator IO without undergoing any heat exchange. This suppresses the temperature rise of the air returning to the evaporator IO.Therefore, it is possible to blow the cold air at a lower temperature onto the regenerators 12A and 12B without reducing the heat exchange capacity of the evaporator IO. , cold storage agent 12
The cooling efficiency of A and 12B can be improved, and the time required to freeze the refrigerant can be shortened compared to the conventional forced convection type.

When the temperature drops below the open operation temperature of the thermostat 54 (set at -16°C in this example), the contact opens and the circulation blower 11B stops, stopping the forced convection of cold air in the specification selection room B. By stopping the cold forced convection in the specification selection chamber 8, the forced cooling in the specification selection chamber 8 is not performed.
The temperature gradually rises, and when it reaches the return operation temperature of the thermostat 54 (-14°C in this example), the contacts of the thermostat 54 close, and the air blower 11 for internal circulation
B starts operation again, the specification selection chamber 80 is cooled by forced convection, and the above-mentioned operation is repeated.
maintain at freezing temperature.

On the other hand, since cold air is led from the outlet side of the article storage section 12 through the duct 14 to the air intake side of the evaporator IO,
This duct 14 acts as a bypass passage for cold air and promotes cooling of the article storage section 12. Since the flow rate of cold air according to (a) is made larger than the flow rate of cold air according to (a), cooling of the article storage section 12 is promoted. Furthermore, since the cold air from (a) does not pass through the storage chamber 8 (and returns to the evaporator 10), it returns with a relative humidity 6 lower than the cold air from (a), and the relative humidity per unit time to the evaporator 10 is The amount of frost is reduced and the number of times of defrosting can be reduced.Furthermore, the article storage section 12 is gradually cooled and the first thermostat 4 is cooled down.
When the temperature drops below the opening operating temperature (set at 36°C in this example), the contact opens, the compressor drive motor 34 stops, and cooling of the freezer compartment 7 is stopped to prevent overcooling of the freezer compartment 7. However, the evaporator blower +1A continues to operate because the AC fan motor 37 is energized.As cooling is stopped, the temperature inside the article storage section 12 gradually increases and the first thermostat 42 return temperature (in this example, -34
°C), the contact closes and the compressor is driven again to cool the freezer compartment 7.The above-mentioned operation is repeated to freeze the refrigerant in the article storage compartment 12. The temperature is maintained below the temperature (-35°C in this example).

Next, the operation unit 52 controls the ice temperature [operating mode 1' (
2)] or refrigeration temperature [operation mode (3) 1] In this case, if you replace "for freezing" in the above operation with "refrigeration temperature or for refrigeration" and operate, The explanation will be omitted because it can be considered that the operation is performed by replacing the first thermostat in the above operation explanation with the second thermostat, but when operating mode (2) (i.e., ice temperature) is selected. If you do,
The temperature inside the article storage section 12 is -15°C, and the temperature inside the specification selection room 8 is 0°C.
℃, and when operating mode (3) (i.e., refrigeration temperature) is selected, the inside of the article storage section 12 is kept at 15℃.
°C, and the inside of the specification selection chamber 8 was maintained at 5 °C.

However, since the temperature relationship is freezing (ice-warm and refrigeration), the operating temperature of each thermostat corresponding to this temperature relationship is different, and the higher the control temperature, the more the circulating air blower 1
The interval between the operation and stop of the circulating air blower 11B becomes shorter, and as a result, the amount of air blown by the circulating air blower 11B per unit time is reduced.

Through the above embodiments, an example was shown in which the inside of the storage room 8 is maintained at one of three temperature zones: freezing, ice temperature, and refrigeration; (1) freezing and ice temperature, 00 ice temperature and refrigeration; 110 It is a combination of two temperature zones, freezing and refrigeration, and one of the temperature zones can be selected.
In this case, it is not possible to support three temperature zones as shown in the example (
It is possible to create a low-temperature refrigerator compatible with two temperature zones, and it is possible to considerably omit the circuit configuration of the temperature control device.

According to the above configuration, the cooling device installed in the low-temperature storage freezes the cold storage agent, and the storage room is cooled by the latent heat of fusion of the cold storage agent, and the temperature set by the six operation unit 52 is The amount of air blown per unit time by the circulating air blower 11B is controlled according to the temperature, and the low-temperature refrigerator is used in multiple temperature zones, including a temperature zone where articles freeze and a temperature zone where articles do not freeze. It becomes possible to do so.

Furthermore, by using this low-temperature warehouse, there is no need for a special low-temperature warehouse at collection and delivery sites or relay points during transportation, and it is possible to reduce the equipment in the transportation system.

Furthermore, since the circulating air blower 11B uses a forced convection method, the temperature distribution inside the storage room becomes uniform, making it possible to sufficiently cope with the case where the inside of the storage room is maintained in the freezing temperature range. Become.

Then, the circulation air blower 11B and the evaporator air blower 11
A is partitioned by a partition wall 17, and the air sucked in from the suction port 16 is cooled by +1 cold storage agent without passing through the evaporator 110.
A and IIB so that the humid air does not return directly to the evaporator IO. Yes
The air guided by the cool storage agent is mixed with the air that has passed through the evaporator 10, and the air is brought close to the temperature inside the refrigerator, and then blown out from the outlet 15 into the storage room 8. This prevents overcooling, which tends to occur with items placed close to each other.

Furthermore, in the article storage section 12, a cold storage agent for freezing +2A and a cold storage agent for ice-temperature refrigeration 12 [3] are loaded together, so when the operation mode is switched by the operation section 52, 6,
There is no need to replace the cool storage agent in the article storage part 12 with a different cool storage agent, and it can be handled by simply switching the operating section 52 to a different operation mode, greatly improving operability and facilitating maintenance.

〔Effect of the invention〕

As described above in detail, according to the present invention, in the freezer compartment,
Since multiple types of cold storage materials (i.e., cold storage agents for freezing and cold storage agents for ice-temperature refrigeration) with freezing temperatures matched to the operating mode are mixed, even when the operating mode is switched using the selection means, the temperature inside the freezer compartment is There is no need to replace the cold storage agent with a different cold storage agent, and this can be done simply by switching the selection means to a different operation mode, greatly improving operability and making maintenance of the low-temperature refrigerator easier.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention. FIG. 1 is a cross-sectional view of the freezer compartment of a low-temperature refrigerator, FIG. 2 is an external perspective view of the low-temperature refrigerator, and FIG. 3 is a sectional view taken along line AA in FIG. 1. , Figure 4 is B-B in Figure 1.
A sectional view, FIG. 5 is an operation control circuit diagram of the low temperature storage, and FIGS. 6 and 7 are timing charts showing temperature changes and operating states in each operation mode. l ・Low temperature storage, 7-・Freezer room, 8...-Storage room, l
O... Evaporator, 11... Air blower, 12A...
・Cold storage agent for freezing, 12B...Cold storage agent for freezing temperature refrigeration,
15...Air outlet, 16...Suction port, 52...
means of selection. Figure 2 Figure 1 Figure 3 Figure 4 ≦ Tomoe

Claims (1)

[Claims] 1. A storage room and a freezing room that are separated by a partition plate placed inside the refrigerator and communicated through an air outlet and a suction port, an evaporator and a blower device placed in the freezing room, and A selection means for selecting each temperature into a plurality of operation modes divided into temperature zones for each room, and a plurality of types of cold storage members stored in the freezing chamber and having freezing temperatures matching the operation modes. A low-temperature refrigerator.