JPH02290485A - Heat insulating container - Google Patents

Abstract

PURPOSE:To eliminate lowering of an inner-box temperature due to natural convection even when an open-air temperature is low and to enable improvement of a performance of control for an aimed temperature by a construction wherein a suction port of a cold accumulating device in a heat insulating box is formed in the upper part inside the box. CONSTITUTION:A heat insulating container 1 has a heat insulating box 7 fitted on the lower side and a cold accumulating device 9 fitted on the rear wall inside said heat insulating box 7, and a suction port 37 of the cold accumulating device 9 is provided in the upper part inside the box. According to this construction, air inside the box is led through a channel of the suction port 37 introduction passages 43, 44 a lower passage 47 passages before and behind a cold accumulating agent 25 a lead-out port 55, and the air inside the box is sucked in the upper part inside the box and blown off as cold air from the upper part inside the box. Accordingly, the air cooled by the cold accumulating agent 25 does not flow through the box, cooling due to natural convection is eliminated and thus an excellent temperature control characteristic is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cold storage container that is cooled by a cold storage agent. [Prior art] As shown in Fig. 10, a refrigerated container for use in a vehicle is used. To facilitate the transportation of contents such as frozen foods 1
:． Casters 201 for movement are placed on the bottom surface of the cold box 200.
It is known that the one with
No. 8 revolution (Utility Model Application Publication No. 1983-1 37261). That is, in this cold storage container, a cold storage unit 203 equipped with a cold storage agent is provided in the cold storage box, and while the vehicle is stopped, the cold storage agent is solidified by the cooling action of a cooling unit (not shown) connected to an external power source. While the vehicle is in operation, the control fan 205 is driven to draw in air from the intake port 207 of the cool storage unit 203 and guide it around the cool storage agent, melting the cool storage agent and using the latent heat of fusion to cool the inside of the refrigerator. In addition to cooling, the temperature is controlled by adjusting the air volume of the control fan 205.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional cold storage container (Table 1), the air that comes into contact with the cold storage agent is introduced through the suction port 207 provided at the lower part of the cold storage section 203. Even when the cooling fan 205 is stopped, the air cooled by the cool storage agent is discharged from the suction port 207 to the lower part of the refrigerator due to natural convection.Therefore, even though there is no need to lower the temperature inside the refrigerator, The temperature inside the refrigerator decreases, and this cooling effect is particularly noticeable when the outside air temperature is low.Therefore, there is a problem that the temperature inside the refrigerator falls too much below the target temperature, resulting in poor controllability.

The present invention aims to solve the problems of the above-mentioned conventional techniques and to provide a refrigerated container with good control characteristics of internal temperature over a wide range of outside temperatures.

[Means for Solving the Problems] The present invention has been made to solve the above problems by freezing the cold storage agent in the cold storage unit placed in the cold storage container (in a well-insulated warehouse) using electric power from a commercial power source. a cooling mechanism; a passage forming member that separates the cold storage section from the inside of the refrigerator and forms a cooling passage for guiding air inside the refrigerator so as to come into contact with the cold storage section; A control fan whose drive is controlled according to the temperature inside the refrigerator by using It is characterized by being formed with a cooling passage through which cold air is guided and further blown out as cold air from an air outlet at the upper part of the refrigerator.

[Function] With the cold storage container of the present invention, when electric power is supplied from a commercial power supply to the refrigeration mechanism while the vehicle is stopped, the refrigeration mechanism is driven, and its refrigeration action causes the cold storage in the cold storage section disposed in the insulated storage. The agent is solidified.

In addition, when power is supplied to the control fan from a commercial power source or an in-vehicle power source to drive the control fan, the air inside the refrigerator is guided around the cool storage agent through the cooling passage and becomes cold air due to the latent heat of melting of the cool storage agent. It is blown out into the refrigerator. This cold air cools the inside of the refrigerator, but the temperature system is
This is done by driving and stopping a control fan to adjust the amount of air around the cool storage agent.

In this way, the air inside the refrigerator is guided to the area around the cold storage agent through the cooling passage separated by the passage forming member by the control fan. Therefore, even when the control fan is not driven, air cooled by the cool storage agent does not flow into the refrigerator from the suction port or the outlet of the control fan.

Therefore, there is almost no cooling due to natural convection, and the control performance to the target temperature is improved.

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

FIG. 1 is a perspective view showing the cold container of this embodiment. FIG. 2 is an exploded perspective view of the main parts of the cold container.

In these figures, a cold storage box 7 with a door 3 for taking out items on the front and casters 5 on the bottom, a cold storage device 9 attached to the rear wall of the cold storage box 7, and A control unit 13 that performs a freezing action to freeze the cold storage agent 25 provided on the cold storage panel 11 of the cold storage device 9, and a control unit 13 that performs a freezing action to freeze the cold storage agent 25 provided on the cold storage panel 11 of the cold storage device 9, and a control unit 13 that is installed on the ceiling of the cold storage box 7 and stirs the air in the bank to equalize the temperature. The main configuration is a circulation fan 15.

The cold storage panel 1 of the cold storage device 9 is connected to the (t.. refrigeration cycle (
A cavillary tube 21 (see Fig. 4), which is a decompression means that constitutes a part of the refrigeration mechanism 80, an evaporation vibrator 23 connected to the cavillary tube 21, and a heat conduction tube sealed in a resin bag. In order to improve the performance, a cold storage agent 25 is provided which is attached to sandwich the evaporating vibrator 23.

Cooling passage 3 that circulates air inside the refrigerator to the cold storage device 9
1 is formed by a passage forming member 32. In other words, the air inside the refrigerator is sucked in through the suction port 37 equipped with the dust intrusion prevention net 35 of the fan power bar 33 on the front side of the cold storage panel 11, and the side plates 39, 4 on both sides of the cold storage panel 11] An introduction passage 43 separated by
44 (see Figure 3), three side plates, 41
The control fan 53 at the upper center of the fan power bar 33 is guided to the lower passage 47 between the lower part and the drain bun 45, and further passes through passages 49 and 50 provided on the front and rear surfaces of the cool storage agent 25.
This is a passage leading to an air outlet 55 having a diameter. The drain van 45 is for discharging water to defrost the frost on the cold storage agent 25 and the like through the drain hose 57.

The configuration of this cold storage device 9 will be further explained according to the order of assembly. First, the cold storage agent 25 held in the evaporating vibe 23 is sandwiched between the holding plates 61 and 63 from both sides, and these are fastened with bolts. , 41 are bolted together to form the cold storage panel 11. This cold storage panel] 1 is placed on the rear wall surface 1 of the cold storage box 7. After fixing the side plates 39 and 41 with bolts and attaching the drain van 45 with bolts, connect the drain hose 57.
Screw in the bracket 65 on the side wall of the cold storage box 7.
, 67 to control the fan power bar 33 and the control fan 5.
3 and further fix the partition plate 71. With this configuration, as described above, the introduction passage 43 is formed on both sides of the cold storage panel 11 in the cold storage device 9, and the passages 49, 50, etc. are formed on the front and rear surfaces of the cold storage panel 11.

The above control unit] 3 is fixed to the upper surface of the cold box 7 via a base 8 made of iron plate.

In this control unit 13, there are provided various devices that constitute a refrigeration cycle together with the cabillary tube 21 and evaporation pipe 23 of the cold storage device 9, namely, a compressor 83, a condenser 85, and an accumulator as shown in FIG. 87 in series, and further capacitor 8
A cooling fan 89 of No. 5, a high-pressure pressure switch SPRH for detecting abnormality in cycle pressure, and the like are provided.

The circuit of this refrigeration cycle (has the configuration shown in Table 5. That is, commercial power supply 1 0 1 fi electromagnetic switches CMR, CMF and compressor thermal relay RT,
The main switch SWκ is connected to the compressor motor MC via the compressor thermostat STMC, and the main relay RLM. Cold storage agent thermostat S
It is connected to the capacitor motor MCD via TC, and is further connected to the rectifier APL, door switch swoo, temperature selection switch SWSE, and interior thermostat STRI, ST.
R2 is connected to the cooling motors MCLI-MCL3 of the control fan 53 and the circulation motor MR of the circulation fan 15. Note that it can also be connected to the cooling motors MCLI to MCL3, the circulation motor MRii, and the vehicle battery BAT.

Each motor is controlled on and off by the above-mentioned thermostats and switches to drive the refrigeration system, but among these, there is a tag installed near the internal thermostats STRI, STR21t, circulation fan 15, and a cold storage agent thermostat STCi & embedded in the cold storage agent 25. Also, among the switches, the main switch SWκ, the temperature selection switch SWSE (in this example, for switching between O'C and 5°C) (Table Commercial power supply 101 or vehicle battery SAT)
A power lamp LBκ is attached to the control panel provided on the front of the control unit 13 along with an abnormality lamp LBA that indicates the abnormal state of the refrigeration cycle and a connector for connecting the power supply when mounted on the vehicle. ing. Note that swoo is a door switch that is attached to the contact surface between the door 3 and the main body of the cold box 7 to detect whether the door is opened or closed, and RPMC is a reverse phase detection relay.

To explain the operation of this refrigeration circuit, when the vehicle is stopped, the commercial power supply 10] (3-phase AC 200V, 50/60H
Z) and turn on the main switch SWM, the compressor thermal relay RT and high pressure breather switch SPR}l are closed (when normal, χ, and when the coolant thermostat STC is closed at a temperature higher than the set temperature, 1)
: When the capacitor motor MCD is turned on, either the positive phase electromagnetic switch CMF or the negative phase electromagnetic switch CMR is also turned on, and therefore the compressor motor MC is turned on.
is driven. As a result, the refrigerant in the refrigeration cycle circulates, and the low-temperature refrigerant whose pressure is reduced in the cabillary tube 21 evaporates in the evaporation vibe 23 embedded in the cold storage agent 25.
Freeze the cold storage agent 25.

In addition, the freezing effect on the cold storage agent 25 (Table 1) is performed by opening and closing the cold storage agent thermostat STC that is in contact with the cold storage agent. This prevents the cold storage agent 25 from overcooling and reduces power consumption.On the other hand, the cold storage agent 25
When the temperature rises to near the freezing point, the refrigeration cycle is turned on. By repeating this process, the cold storage agent 25 is maintained in a frozen state.

In addition, when the refrigeration circuit is turned on (see table), the electric power converted to DC by the rectifier APL is transferred from the door switch swoo and the temperature selection switch SWSE to the internal thermostat STRl.S.
When the cooling motors MCLI to MCL3 of the control fan 53 are driven, air cooled by the cold storage agent 25 is sent into the refrigerator for cooling. Here, the temperature selection switch SW
SELt is a terminal switch that can be switched between 0°C and 5°C, and internal thermostats STRI and STR2 at 0°C or 5°C are connected to each terminal, so that when the internal temperature reaches the set temperature, Internal thermostat S
Switching will be performed at TRI and STR2. By switching these internal thermostats STRI and STR2, the cooling motors MCLI to MCL3 and the circulation motor MR are selectively driven. That is, when the temperature inside the refrigerator rises, the circulation motor MR is turned off and at the same time 1:. Cooling motors MCLI to MCL3 turn on and blow out cold air into the refrigerator, and on the other hand, when the temperature is lower than the set temperature (Table 1) At the same time as cooling motors MCLI to MCL3 turn off, 1:
．． The air inside the refrigerator is stirred only by driving the circulation motor MR, and the variation in temperature between the upper and lower parts of the refrigerator is reduced. By repeating this process, the temperature inside the refrigerator is kept uniform at the set temperature.

On the other hand, while the vehicle is running, the commercial power source 101 is disconnected, but the electric power from the battery BAT is combined with the circulation motor MR or the cooling motors MCLI to MCL31 to melt the cold storage agent 25 in the same way as described above. A control fan 53 blows out cold air using latent heat, and a circulation fan 15 adjusts the temperature inside the refrigerator. In addition, door 3
When the door switch swoo is opened, the cooling motors M CLI to M CL3 and the circulation motor MR are stopped by the action of the door switch swoo.
5 and the evaporation pipe 23 to reduce frost buildup. To explain the process of controlling the temperature inside the refrigerator using the time chart shown in FIG. 6, when the commercial power source 101 is connected at time t to and the compressor motor MC and capacitor motor MCD in the control unit 13 are driven, The temperature T of the cold storage agent 25 and the internal temperature T2 decrease. Then, at time t+I, when the internal temperature T2 reaches the set temperature 72m, the cooling motors MCLI to MCL3 are controlled to turn on and off by opening and closing the internal thermistors STRI and STR2.The internal temperature T2 is maintained at the set value 72m. be done. Further 1: After the process of solidifying the cold storage agent 25 at time t2, on-off drive control of the compressor motor MC etc. is performed by the opening/closing operation of the cold storage agent thermostat STC to check the solidification state of the cold storage agent 25. maintain. Subsequently, when the connection with the commercial power source 101 is disconnected at time t, the combustor motor MC stops, so the refrigerant 25
Although the refrigeration effect on the Kuhnong motor MC is eliminated,
LI~MCκ2 and circulation motor MR [Table: Vehicle battery B
Since it is driven by the AT, the interior of the refrigerator is cooled by the latent heat of fusion of the cool storage agent 25.

The inside of the refrigerator is maintained at the set temperature T2m by such a cooling effect, but in the configuration of this embodiment (by providing the suction port 37 of the cold storage device 9 at the upper part of the inside of the refrigerator,
The path through which the air inside the refrigerator is guided by the cooling motors MCLI to MCL3 {upper suction port 37 of the fan power bar 33 - introduction passages 43, 44 - lower passage 47 - passages 49, 50 before and after the cold storage agent 25 - outlet 55, In other words, the air inside the refrigerator is sucked into the upper part of the refrigerator and blown out as cold air from the upper part of the refrigerator.

Therefore, even when the control fan 53 is not driven, since the suction port 37 is provided at the upper part of the refrigerator instead of at the lower part as in the conventional technology, the air cooled by the cold storage agent 25 is It does not flow into the refrigerator. Therefore, there is no cooling due to natural convection, and the temperature control characteristics are good.

In addition, when the control fan 53 is not driven, the circulation fan 5 is driven to stir the air in the refrigerator] 2. The temperature inside the refrigerator can be maintained uniformly throughout the refrigerator.

The effects of the configuration of this embodiment will be explained using FIGS. 7 and 8 in comparison with a conventional type that sucks air inside the refrigerator from the lower part of the refrigerator. In this embodiment shown in FIG. 7, the outside air is 1
Even at about 0°C, the inside of the refrigerator can be maintained at a stable internal temperature T2 of about 4.5°C. On the other hand, in the conventional technology shown in Fig. 8 (when the outside air is very low, even when the control fan 53 is turned off, the internal temperature T2e of the cooling compartment decreases due to natural convection, and the control characteristics In addition, in this embodiment (35°C even when the outside temperature is high), it is possible to maintain the internal temperature T2 at the set temperature T2 as in the conventional technology. In order to reduce power consumption, the control fan 53 is turned off when the circulation fan 15 is driven, but by keeping the circulation fan 5 always on even when the control fan 53 is being driven, The uniformity of the temperature inside the refrigerator may be further improved.Also, in the above embodiment, the introduction passages 43 and 44 are provided on both sides of the cold storage panel 11, and the air from the introduction passages 43 and 44 is combined and blown. Although the configuration is such that the air is blown out from the outlet 55, any configuration may be used as long as the suction port is provided at the upper part of the inside of the refrigerator.For example, as shown in FIG. It is divided into left and right chambers 151 and 153, and the air inside the refrigerator is introduced from the suction port 154 at the top of one chamber 151, and the passage before and after the cold storage agent 25, which is guided to the other chamber 153, also serves as an introduction passage. With this configuration, the cold storage device 9 can be downsized, and the storage space in the cold storage box can be increased.

[Effect of the invention 1] As explained above (:, According to the present invention, by forming the suction port of the cold storage device in the cold storage box at the upper part of the refrigerator, the temperature inside the refrigerator can be lowered by natural convection even when the outside temperature is low. There is no decrease, and the control performance to the target temperature can be improved.

[Brief explanation of drawings]

FIG. 1 is a strabismus doctor showing a cold box according to an embodiment of the present invention. FIG. 2 is a strabismus doctor disassembling the cold box of the same embodiment.
Figure 3 shows the horizontal cross-section of the cold storage device. Figure 4 shows the refrigeration cycle. Figure 5 shows the electrical circuit of the refrigeration cycle.
8 through 8 are graphs showing the operation of the refrigeration cycle of the same embodiment, and FIG. 9 is a perspective view showing a cold storage device according to another embodiment.] Figure 8 is a perspective view showing a conventional cold storage box. 1...Cold storage container 7...Cold storage box (insulated warehouse) 9...Cold storage device 11...Cold storage panel (
Cold storage unit) 13... Control unit 15...
Control fan 25...Cold storage agent 31...Cooling passage 32...Passage forming member 37, ]54...
Suction port 43... introduction passage 49, 50... passage,
53... Control fan 55... Air outlet
80... Refrigeration cycle (refrigeration mechanism) 101.
・Commercial power supply BAT・・・Battery (vehicle power supply)

Claims (1)

[Scope of Claims] A cooling mechanism that freezes a cold storage agent in a cold storage section arranged in an insulated warehouse using electric power from a commercial power supply, and a storage system that separates the cold storage section from the inside of the warehouse and makes contact with the cold storage section. a passage forming member that forms a cooling passage for guiding internal air; and a control fan that is provided in the cooling passage and is driven and controlled according to the temperature inside the refrigerator using electric power from a commercial power source or an on-vehicle power source. The passage forming member is formed to include a cooling passage that introduces air inside the refrigerator from the suction port at the top of the refrigerator, guides it around the cool storage agent, and blows out the air as cool air from the outlet at the top of the refrigerator. A refrigerated container characterized by: