JPS62218778A - Refrigeration room - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to a freezer compartment, for example, a freezer compartment of a refrigerator.

In particular, it relates to a freezer compartment with improved freezing performance.

[Conventional technology]

A conventional refrigerator with a freezer compartment will be explained with reference to FIGS. 17 to 19. 1 is a compressor, 2 is a condenser, 3 is a fan motor, 4 is a back-feeding fan directly connected to the fan motor 3, 5 is a cooler, 6 is a freeze room, and 7 has the freeze room 6 inside. Freezer compartment, 8 is the refrigerator compartment, 9 is the vegetable compartment, 10 is the automatic armpit with thermostat, 11 is the air outlet to the freeze room 6, 0.12 is the suction port from the freeze room 6 to the freezer compartment 7, and 13 is the inside of the freeze room. It is food placed in In the cooler 5, a secondary system using Freon as a cooling medium,
The primary system uses air as a medium to exchange heat.

The medium for the two threads is passed from the cooler 5 to the coagulator 21r: through 9. Pressure m
A closed loop is formed in which the water returns to the cooler 5 via the rocky shore 1 as a cooling medium. On the other hand, the primary medium cooled by heat exchange in the cooler 5 is sent to the freeze room 6 and the refrigerator compartment 8 as cold air by the blower fan 4 at a flow rate ratio of approximately 4:
Air is blown at a rate of 1. The cold air flowing into the freeze room 6 from the air outlet 11 blows the food 13 inside the freeze room 6.
is cooled and frozen, flows out through the suction port 12, passes through the freezing chamber 7, and returns to the cooler 5, forming a closed loop. In addition, the cold air flowing into the refrigerator compartment 8 through the passage 10' and the automatic dumper 10 with a thermostat is transferred to the refrigerator compartment 8 and the vegetable compartment 9.
It is a closed loop that cools the inside and returns to the cooler 5.

FIG. 18 is a horizontal sectional view of the freezing room, and FIG. 19 is a perspective view of the freezing room.

The food 13 is cooled and frozen in the freeze room 6 by blowing cold air sent by the blower fan 4 in a fixed direction through the outlet 11 with a uniform current. After cooling the food 13, the cold air flows into the freezer compartment 7 from the suction port 12.
sent to. In order to keep the temperature inside the freeze room 6 constant, the wall temperature inside the freeze room 6 is detected, and the compressor 1 and the fan motor 3 are controlled on/off in conjunction with each other.

In general, food can be stored for a long time if it is frozen, according to Nagaoka's ``Principles of Freezing and Its Applications,'' but if the food is frozen slowly, the state inside the cells of the food will be different from before freezing, even if it is thawed afterwards. It does not return to its pre-freezing state, and therefore has less meaning. To eliminate this drawback, rapid freezing is required. In order to rapidly freeze food, it is necessary to shorten the required freezing time τ shown in FIG. 20. Furthermore, in general, when the temperature fluctuation range of the air in the freezer compartment is large, there is a high probability that the cells of the food will be destroyed, so it is necessary to equalize the temperature distribution in the freezer compartment for food quality control.

For example, Japanese Patent Application Laid-open No. 59 (1983)
-231372, 59-231376, 59-29
There are 964 etc.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the air outlet to the freeze room is fixed, the blowing angle of the cold air relative to the food remains unchanged regardless of the positional relationship of the food. Therefore, depending on how the food is placed, there will be differences in how the food cools, and when new food is placed in the 7 Lees Room, it may be difficult to quickly freeze the new food depending on how the food is placed. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a freezer that allows rapid freezing and uniform temperature distribution regardless of the placement of new foods.

[Rounding method to solve problems]

The above object is to provide a rotary blower having a plurality of blow-off openings and rotated by a motor in the center of the freezer compartment or the center of the ceiling, and to guide cold air from the cooler to the rotary blower using a blower. This can be achieved by configuring the air to be blown into the freezing chamber from the opening.

[Effect]

According to the unpublished paper of the 8th Japan Heat Transfer Symposium, "Study on heat transfer of jets blowing perpendicular to the surface of a flat plate," the local mass transfer coefficient on a flat plate in the case of a plane jet is shown in Figure 3. It is shown as follows. Figure 3 shows the results of an experiment conducted by Hide et al. using the naphthalene sublimation method. Assuming that there is similarity, it is the same as the heat transfer coefficient. From Figure 3, when the ratio between the nozzle plate distance H and the nozzle diameter is small, there is one small peak very close to the flow point, and the ratio of the radial distance r from the flow point to the nozzle diameter. There is a second peak when r/I) is close to 2. As the r force increases by more than 2, the local Schawood number becomes downward slope. In this way, by directly blowing a jet onto a flat plate, the ** conductivity, that is, the heat transfer coefficient near the impact flow point, is reduced after the collision (the part that comes into contact with the air flowing along the plate, i.e., the stagnation point). The heat transfer coefficient is higher than that in the exposed area. Therefore, rapid freezing can be more effectively achieved by directly impinging air on the food to be frozen than by simply moving the air around the food to be frozen.

In other words, in order to shorten the time required for freezing, it is effective to blow cold air over the food and move the cold air that is in contact with the surface of the food.In particular, it is effective to make the cold air directly impinge on the food. It is important to increase the heat transfer coefficient.
This will shorten the required freezing time T.

According to the means of the present invention described in the previous section, the above-mentioned effects are effectively performed, and the cold air blown into the freezer compartment from the plurality of blow-off openings of the rotary blower is evenly distributed over the foods arranged around the blow-out rotator. impingement cooling and rapidly freezing food. Furthermore, the temperature within the freezing chamber can be made uniform. Therefore, there is no difference in the way food is frozen depending on the placement of the food.

〔Example〕

Hereinafter, some embodiments of the present invention will be described with reference to FIGS. 1 to 16. In the present invention, the freezing room is not installed in one corner of the freezing room, but the freezing room also serves as a 7-lease room.

In the figure, 4 is a blower fan rotated by a fan motor 3;
5 is a cooler.

In FIG. 1, 15 is a hollow cylindrical rotor and has a plurality of blow-off openings fi14. This cylindrical rotator 1
5 is installed in the middle dog part of the refrigerator N7, and the upper part is connected to the motor 16 by the belt 17 via the belt 28, and the lower part is configured to send cold air from the blower fan 4.

Reference numeral 18 denotes a food table, and a pole supporter 19 is provided at the bottom of the food table, and the structure is such that it can be rotated manually.

Food 13 is loaded on top of it.

When the temperature inside the freezer compartment 7 rises due to addition of new food, opening/closing of the door, etc., the following operation is performed to cool and freeze the food 13. That is, as the temperature within the freezer compartment 7 rises, the compressor, fan motor 3, and motor 16 operate. The operation of the fan motor 3 causes the air blower 7 to start rotating, and the operation of the motor 16 causes the cylindrical rotator 15 to start rotating. The primary medium air cooled by heat exchange in the cooler 5 is turned into cold air by the blower fan 4 and is blown into the cylindrical rotator 15 . Cold air is cylindrical rotation @15
Since it is rotating, it blows out into the freezer compartment 7 as a jet from the plurality of blow-off openings $14. The rounded cold air directly collides with the food 13, cools and freezes the food 13, passes through the lower part of the freezer compartment 7, and returns to the boiler 5.

In order to keep the temperature inside the freezer compartment 7 constant, the wall temperature inside the freezer compartment 7 is detected, and the compressor, fan motor 3, and drive motor 16 of the cylindrical rotator 15 are controlled on/off in conjunction.

Further, the fan motor 3 and the drive motor 16 of the cylindrical rotator 15 are configured to automatically stop when the door of the freezer compartment 7 is opened, so that the cold air blown from the blow-off opening $14 is not blown directly into the atmosphere. do.

In the configuration shown in FIG. 1, the distance between the blow-off opening 14 of the cylindrical rotator 15 and the food product 13 is short regardless of how the food product 13 is stacked. Food 1 is placed concentrically around the cylindrical rotator 15.
3 are stacked in the height direction, the cold air can be made to collide with almost all the foods 13. Therefore, multiple lines of food 13 can be quickly frozen more effectively at the same time.

At the same time, the air in the freezer compartment 7 can be stirred by rotating the Suita opening 14, so that the temperature distribution of the air in the freezer compartment 7 becomes uniform. Therefore, the estimation of the gust temperature in the freezer compartment 7 is made easier depending on the wall surface temperature, and the temperature control operation efficiency of the freezer compartment 7 is also improved.

In addition, since the food table 18 in FIG. 1 can be manually rotated, the food 13 after freezing can be easily sorted and taken out.

FIG. 2 shows an operation control block diagram of the ventilation fan 4 and the cylindrical rotator 15. Air blowing fan 4 and cylindrical rotator 15
is started and stopped according to instructions from the wall temperature detector 20 of the freezer compartment 7 and on/off of the door opening/closing detector 21. Freezer compartment 7
The wall temperature is controlled within a predetermined indicated range. That is, when the indicated value of the wall temperature detector 20 of the freezer compartment 7 exceeds the upper limit temperature value, the output of the upper limit temperature comparator 22 becomes 1", and when it becomes lower than the lower limit temperature value, the output of the lower limit temperature comparator 23 becomes @1".
It is supposed to be #. The output of the door opener 21 is set to '1# only when the door is opened. Further, when the output of control s24 is @l#, the motor 16 and fan motor 3 are operated. Suppose now that the temperature of the freezer compartment 7 has risen and the Mii temperature detector 20 has exceeded the Kamiiso value. Due to the combination of the OR circuit 25, inverter 27, and AND circuit 26 of the control unit 24, the output of the control unit 24 is set to 'l', the motor 16 and the fan motor 3 are started, and the cylindrical rotating body 15 and the ventilation fan are activated. 4 rotates.Next, when the indicated value of the wall temperature detector 20 of the freezer compartment 7 falls below the lower limit value or when the door opens, the control unit 2
The output of 4 is @0#, the motor 16 and the fan motor 3 are stopped, and the cylindrical rotating body 15 and the ventilation fan 4 are stopped.

FIG. 4 is a modified embodiment of FIG. 1. 50, 50' is a gear for transmitting the power of the motor 16 to the cylindrical rotator 15 via a pulley 28, and 29 is a support rod with a goal 19 that rotatably hangs the food table 18. The cold air sent by the blower fan 4 passes through the upper part of the freezer compartment 7 and is sent into the cylindrical rotator 15 from above, and the blowing opening 14
It blows out.

In the embodiment of FIG. 4, the length of the cylindrical rotator 15 is shorter than that of FIG. Therefore, when considering the driving force of the seven motors 3 as one door, the flow rate of the cold air blown out from the blow-off opening s14 is faster than in the case of FIG. 1, and the cooling/freezing performance of food can be further improved.

! Figure J5 shows an embodiment in which a nozzle rotator 30 is used in place of the cylindrical rotator 15 in Figure 1. It has a nozzle. There is a blowout opening at the tip of the nozzle. Since the plurality of nozzles have different blowing angles, it is possible to directly impinge the cold air on the food 13 regardless of how the food 13 is arranged.

FIG. 6 shows an embodiment in which the nozzle rotator 30 shown in FIG. 5 is provided above and below the freezer compartment 7. Upper nozzle rotator 30-a
and the lower nozzle rotator 30-b are connected by a connecting rod 31. Therefore, the nozzle rotators 30-a and 30-b can be rotated by one motor 16. The cold air sent by the blowing fan 4 is branched into the upper and lower parts of the freezer compartment 7, and is blown to the upper nozzle rotator 30-a and the lower nozzle rotator 30-b. In this example,
By providing two nozzle rotators for blowing out cold air, the distance between the blowing opening and the food 13 is shortened regardless of how the food 13 is stacked, and the freezing performance is further improved.

, 11E7 show an embodiment in which a straight tubular rotor a32 as shown in the figure is used in place of the nozzle rotator 3o.

The straight tubular rotator 32 has a plurality of blowout openings 14 . The cold air from the ventilation fan 4 passes through the upper part of the freezer compartment 7,
It is fed into a straight tubular rotator 32 and has a plurality of blowout openings 1.
4. It will blow out directly below you.

Since the cold air always flows from top to bottom, it can directly impinge on the food 13 regardless of how the food 13 is arranged. Instead of the straight tube rotator, a cross tube rotator, a hollow disk rotator, or the like may be used.

FIG. 8 shows an embodiment using a disk-shaped rotator with variable Suita opening. The disc-shaped rotator consists of a hollow disc 33 into which cool air is sent from the fan 4, and a disc 34 that is in contact with the lower surface of the hollow disc 33. The lower surface of the disk 33 and the pulley 28 and the gear 5
Rotated through 0,50'. Moreover, the disk 34 is /
connected to the 1:1-II shaft 35' of the coll smoke 35,
The stator of the pulse motor 35 is rotated in the same direction and at the same speed as the pulley 28 and the disc 33 via gears 51 and 51'. Therefore, /mother motor 35
When the motor operation is not performed, the circle 633 and the disc 34
and rotate together without any relative rotation. The disk 34 rotates slightly relative to the disk 33 when the master motor 35 operates, thereby making the blowing area of the blowing opening 14 variable. A weight sensor (for example, a strain gun) 36 is installed at the bottom of the food table 18 to detect the total weight of the food 13 placed on the food table 18.

FIG. 10 is an enlarged view of the driving portion of FIG. 8.

37 is a protective cover f5, Yarus motor 35041
This is to protect 1 from cold wind.

In the embodiments shown in FIGS. 8 to 10, assuming that the driving force of the fan motor 3 is constant, by varying the size of the blow-off opening 14, the flow velocity of cold air into the freezer compartment 7 can be varied. In other words, when the total weight of the food 13 is light, the food 13 is considered to be placed at the lower part of the freezer compartment 7, so by making the Suita opening 14 smaller and increasing the blowing flow velocity, cold air can be directed to the food 13. It becomes possible to improve the collision effect, and the freezing performance of the food 13 is improved.

On the other hand, when the total weight of the food 13 is heavy, the food 13 is considered to be placed up to the top of the freezer compartment 7, and the distance between the blow-off opening 14 and the food 13 is short, so the blow-off opening s14
By increasing the size, a large number of foods 13 can be efficiently frozen.

FIG. 11 is a block diagram showing the operation control of the variable outlet opening disk 34 in FIGS. 8 to 10. noyarus motor 3
5 moves according to the total weight of the food 13 in the freezer compartment 7. Further, due to the slight movement of the master pulse motor 35, the blow-off opening variable disk 34 moves slightly with respect to the disk 33, thereby changing the size of the blow-off opening 14. The weight sensor 36 is located in the freezer compartment 7.
operates at the moment the door opens and closes. Also'
The gJ dust switch 42-1.42-2.42-3 moves to 1 when the door of the freezer compartment 7 is open, and moves to 2 when the door is closed. An upper limit weight value is set in the setter 39-1, and a lower limit weight value is set in the setter 39-2. Oneshi 1t/4 lus generator 4
1-1.41-2.41-3 generate one positive pulse each having a different pulse width. When the indicated value of the weight sensor 36 set at the bottom of the food table 18 exceeds the upper limit weight value, the output of the comparator 38-1 changes to @
1#, and when it becomes lower than the lower limit weight value, the comparator 38-2
The output of the NOR circuit 40 becomes 11#, and when the value of the upper limit type is between the value of the upper limit and the lower limit weight value, the output of the NOR circuit 40 becomes @l''.

Next, the 9 pulse generator 41 receives the signal ``11'' and generates a positive base pulse of the set pulse width, and drives the pulse motor 35 by an angle proportional to the base pulse width. Here, when the pulse is positive, ・9rus motor 35
is driven in the direction to open the blow-off opening 14. There is currently an amount of food 13 in the freezer compartment 7 that exceeds the upper limit type t1K.
It is assumed that the door of the freezer compartment 7 is opened and closed in order to take out some of the food 13 from there. At this point, the blow-off opening 14 ('i) has a size commensurate with the total weight of the food 13.

The moment the door of the freezer compartment 7 is opened, the weight sensor 36 is activated. Furthermore, the changeover switches 42 are each changed to 1 and 9, resulting in a control system including an inverter 43. Weight sensor 3
6 signal is sent to comparator 38-1.

38 to 2, respectively. In this case, the amount of food 13 exceeding the upper limit weight value is contained, so comparison 638-
The output of 1 is @11α and the others are @0”. Therefore,
Only the /4 pulse generator 41-1 operates, and the set positive pulse is generated.

Next, the inverter 43-1 reverses the sign of the )
The nozzle motor 35 is driven in the opposite direction, and the blowout opening 14 is
completely close. That is, the moment the door of the freezer compartment 7 is opened, the blow-off opening 14 is closed. Next, some of the food 13 is taken out and the door of the freezer compartment 7 is closed. The weight sensor 36 operates again. In addition, the changeover switch 42 is changed to 2 and reversed, respectively. ! S4
The control system does not include 3. If the indicated value of the weight sensor 36 is between the lower limit weight value and the lower limit weight value when the food 13 is taken out, the outputs of the comparators 38-1 and 38-2 become @O'', and the output of the NOR circuit Only @1
”. Therefore, only the pulse generator 42-2 operates, and the set positive main pulse is generated, and the main pulse motor 3
5 to open the blow-off opening 14 in proportion to the weight. In this embodiment, when the door of the freezer compartment 7 is opened and closed, the operation is as described above, and the size of the blow-off opening 14 is varied.

FIG. 12 shows the size of the blow-off opening 14 in each of the above cases. If the total weight of the food 13 in the freezer compartment 7 is lower than the lower limit weight value, the outlet opening 14 is
is as shown in (a), and when the upper limit type is between the value and the lower limit weight value, as shown in +b), and when it exceeds the upper limit weight value, t
c).・! Lux generator 43-1.43-2
．． 43-3, the blowout opening 14 is t in FIG.
No J so that el, lb), (a)? The width of Luz is set.

In this way, according to the xi of the food 13 in the freezer compartment 7,
By varying the size of the blow-off opening s14 and controlling the blow-out flow rate of the cold air, the freezing performance of the food 13 is improved. In this way, it is possible to directly apply cold air to the food 13 regardless of how the food 13 is arranged or how it is stacked.
Freezing performance can be improved compared to conventional technology.

FIG. 13 is a modified embodiment of FIG. 8. A position sensor 46 is installed on the wall of the freezer compartment 7, and has a mechanism that is driven to face various directions three-dimensionally. The arrangement can be detected.

The disk rotator includes a hollow disk 44 having a plurality of blowout openings 14 distributed in the circumferential direction and radial direction on the lower surface as shown in FIG. It consists of a Suita opening opening/closing disc 45. The hollow disk 44 and the blow-off opening opening/closing disk 45 are rotationally driven by the same mechanism as the hollow disk 33 and the disk 34 in the embodiment shown in FIG.

The position sensor 37 detects the distribution of the food 13 and controls the amount of fine movement of the nozzle motor 35 so that only the blow-off opening 14 corresponding to the zone where the food 13 is present is opened. For example, if the food 13 is concentrated in the center of the food table 18, the relative angle between the disk 44 and the blow-off opening opening/closing disk 45 may be adjusted using the pulse motor 35 as shown in FIG. 16(a). This is done using a small Nhil, with only the central blow-off opening 14 open and the rest closed. If the food 13 is distributed outside the center, as shown in Figure 16 (b), and if the food is distributed both in the center and other than the center, as shown in Figure 16 (e), The minute vJf of the lance motor 35 is controlled so that the opening 14 is opened. In this way, you can eliminate unnecessary cold air, and
It becomes possible to reliably cause the cold air to collide with the food 13,
It can be frozen even more efficiently.

It should be noted that, although the above embodiments are related to a freezer compartment attached to a refrigerator, it is of course possible to apply the present invention to a freezer compartment not attached to a refrigerator. Furthermore, in the above embodiments, a protective net may be installed in the freezing chamber to prevent food from colliding with the cylindrical rotator, nozzle rotator, straight tube rotator, disc rotator, etc. that have blow-off openings. .

〔Effect of the invention〕

According to the present invention, since the distance between the blow-off opening and the food in the freezer compartment is short and the blow-off opening rotates, it is possible to impinge cool many foods at the same time, and it is possible to impinge cool many foods at the same time. This enables rapid freezing of food and improves food freezing performance. In addition, by arranging the blow-off opening in the center of the freezer compartment, the food will be close to the blow-off opening even if the freezer compartment is enlarged, making it possible to increase the size of the freezer compartment. Since there is no need for a freezer room, the usable volume of the freezer compartment is correspondingly large, and a large number of foods can be frozen, improving economic efficiency. Furthermore, since the air within the freezing chamber is stirred, the temperature distribution within the freezing chamber can be made uniform, and the operating efficiency of the freezing chamber can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a block diagram of the operation control of the fan and cylindrical rotor of the same embodiment, and FIG. 3 is a diagram of changes in local mass transfer coefficient of a flat plate. 4 to 8 are longitudinal sectional views of other different embodiments of the present invention, FIGS. 9 and 10 are partial views of FIG. 8, and FIG. 11 is a blowout of the embodiment of FIG. 8. Operation control block diagram of variable opening panel, 12th
Figure (a). (b) # (e) is a diagram showing the change in the size of the blow-off opening in the embodiment of FIG. 8, FIG. 13 is a longitudinal cross-sectional view of still another embodiment of the present invention, Figure 15 is the first
A bottom view of the hollow disk in Fig. 3 and a bottom view of the blow-off opening opening/closing disk, Fig. 16 (a), (b) v te)
13 is a diagram showing the opening and closing of the blow-off opening of the embodiment, FIG. 17 is a vertical sectional view of a conventional refrigerator with a freezer compartment, FIG. 18 is a horizontal sectional view of a conventional freezer compartment, and FIG. 19 is a conventional refrigerator with a freezer compartment. FIG. 20 is a perspective view of the freeze room, and FIG. 20 is a food freezing performance curve diagram. 3...Fan motor 4...Blower fan 5.
...Cooler 6...Freeze room 7...
・Freezer room 8... Refrigerator 13... Food
14...Blowout opening 15...Cylindrical rotator 16...Motor 17...Belt 1
8... Food stand 19...? -L supporter 20...
・Wall surface temperature detector 21...Door opening/closing detector 22・
... Upper limit temperature comparator 23 ... Lower limit temperature comparator 24
...Control section 25...OR circuit 26...A
ND circuit 27...inverter 28...f
IJ29...Support rod 30...Nozzle rotator 31...Connecting rod 32...Straight tube rotator 33...Hollow disk 34...Blowout opening variable disk 35...Armum motor 35'...
Axis 36...l! IT sensor 37...Protective cover 38...Comparator 39 Setting device 40...
NOR circuit 41...pulse generator 42...
Changeover switch 43... Inverter 44... Hollow disk 45... Outlet opening variable disk 46...
Position sensor 50.50', 51.51'...Gear Fig. 1 7q Hall support 1 gauge Fig. 3 Distance from stagnation point (Yu dimension) r/D Fig. 6 Fig. 8 Fig. 9 Fig. 12 Figure (a) Figure 13 Figure 17) Tokan 1〒Yonichijima

Claims (1)

[Claims] 1. A rotary blower having a plurality of blowing openings and rotated by a motor is provided in the center of the freezing chamber or in the center of the ceiling,
A freezing chamber characterized in that the cold air from the cooler is guided into the rotary blower by a blower and is blown into the freezing chamber from the plurality of blowing openings. 2. The freezer compartment according to claim 1, wherein the rotary blower has a cylindrical shape with a plurality of blowing openings on the cylindrical surface. 3. The freezer compartment according to claim 1, wherein the rotary blower is disk-shaped with a plurality of blow-off openings on a disk surface. 4. The freezer compartment according to claim 3, wherein the size of the blow-off opening is variable. 5. The freezer compartment according to claim 3, wherein the radial position distribution of the blow-off openings is variable.