JPS5829431Y2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator in which frost is formed mainly on a specific surface of the wall of the freezer compartment.

It is well known that in conventional direct-cooled refrigerators in which the wall of the freezer compartment is made up of a cooler, when the door is opened, humid outside air enters the freezer compartment, causing frost to form on the inside of the freezer compartment, that is, on the entire inner surface of the cooler. It is being

For this reason, a defrost heater is attached to the cooler to defrost it, but when defrosting, it is necessary to remove the food from the freezer compartment to prevent adverse effects such as deterioration of the food due to heat or defrost water. This was extremely inconvenient.

The present invention was made to eliminate the above drawbacks,
Therefore, the main purpose of this is that even if the defrosting operation is performed with the stored items stored, there is no risk of deterioration of the stored items due to the defrosting heat and defrosting water, so that the defrosting operation can be performed regardless of whether or not the stored items are stored. The purpose is to provide a refrigerator that enables frost operation.

An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. The inside of the freezer 3 is used as a freezing compartment 6, and the inside of the inner box 4 is used as a refrigerating compartment 8 cooled by an evaporator tuff.

9 is a compressor with a built-in drive motor, 10 is a capacitor, and 11 and 12 are opening/closing doors of the freezer compartment 6 and the refrigerator compartment 8, respectively.

In addition, 13 is a drain pipe that penetrates the partition insulation wall 14 that isolates the freezer compartment 6 and the refrigerator compartment 8, and 15 is a water receiving gutter that receives water flowing down through the drain pipe 13 and guides it to the outside of the refrigerator. It is.

As shown in FIGS. 2 and 3, the freezer 3 includes a first cooler 16. Second cooler 17. Bottom plate 18 made of a heat insulating material such as plastic. The second cooler 17 is composed of a left side plate 19 and a right side plate 20, both of which are made of a heat insulating material such as plastic. Continuous back part 22
, and the lower edge of the back surface portion 22 has a left side.

The water receiving step portions 23.degree. 23 gradually descend from the right end toward the center portion, but at the center portion, the water receiving step portions 23.degree.
A water drain notch 24 is formed between the opposing portions 23 .

Reference numeral 25 denotes an evaporation pipe, which is laid on the ceiling surface 21 of the second cooler 17, for example, by a pipe-on-sheet method, as shown in FIG.

In this Figure 4, 26, 27 and 28 are the first,
Of the second and third defrost heaters, the first defrost heater 26 is attached to the front and left and right parts of the ceiling surface section 21, and the second defrost heater 27 is attached to the front section of the ceiling surface section 21. A third defrosting heater 28 is attached near the center of the rear section 2.
2 so as to be approximately evenly distributed.

On the other hand, at the rear end of the bottom plate 18, a back plate part 29 extends in a rising shape, the upper edge of which is shaped to abut against the water receiving step part 23, 23 of the second cooler 17, A drainage port 30 is formed in the center thereof, into which the opposing hanging edges of the water receiving step portions 23, 23 are inserted.

The left and right side plates 19 and 20 are symmetrical, and therefore, for example, the left side plate 19 will be described as a representative example.
The upper side gradually slopes downward toward the rear, and a flange 31 that protrudes inward extends from the upper side, while a flange 32 that protrudes inward also extends from the lower side. Two receiving portions 33, 33 are formed on the portion, both of which protrude inwardly and extend in the front-rear direction, but are slightly inclined downwardly toward the rear.

The first cooler 16 has a flat plate shape, and an evaporation pipe line 34 is laid therein by a pipe-on-sheet method or the like like the evaporation pipe line 25.

The evaporation pipe line 34 of the second cooler 16 and the evaporation line 25 of the second cooler 17 are both for evaporating the liquid refrigerant passing through each to produce a cooling effect. In order to keep the set temperature of the first cooler 17 at least 5° C. lower than that of the first cooler 16, the total volume of the evaporation pipe 25 is set larger than that of the evaporation pipe 34.

Thus, the second cooler 17. The bottom plate 18, the left side plate 19, and the right side plate 20 are combined into a box shape and bonded appropriately at the flange portions 31 and 32 to form a box body, and the receiving portions 33 and 33 of the left and right side plates 19 and 20 are assembled. The left and right end portions of the first cooler 16 are inserted between them, thus forming the freezer 3. Therefore, as shown in FIGS. 1 and 2, the ceiling surface portion 21 of the second cooler 17 The left side plate 19 and the right side plate 20 form the left wall and the right side wall, respectively, and the bottom plate 18 forms the lower wall. The first cooler 16 is located in the freezer compartment 6 above the bottom plate 18, and is arranged with a slight downward slope toward the rear. As a result, an opening 35 facing the bottom plate 18 is formed at the rear of the first cooler 16 .

Note that 36 is a refrigerant pipe lead-out notch formed in the left upper end of the back plate portion 29 of the bottom plate 18 .

The first, second and third defrosting heaters 26, 27 and 2
8 is designed to be energized/disconnected by a count switch mechanism 37 (see Fig. 5) that counts the opening/closing of the opening/closing door 11 for the freezer compartment 6, and its structure will be explained with reference to Fig. 5. In other words, 38 is a case embedded in a portion of the insulation box 1 facing the opening/closing door 11, and inside the case 38,
A ratchet 39 and a cam body 40 that rotates integrally with the ratchet 39 are pivotally supported, and a recess 41 is formed in the outer peripheral surface of the cam body 40.

42 has its tip protruding from the case 38 to open and close the door 11.
A lever 4 is attached to the rear end of the moving body 42.
3 are connected to each other, and this lever 43 is in contact with one of the pawls 39a of the ratchet 39.

The movable body 42 is constantly pressed in the direction of the opening/closing door 11 by the spring 44, and as the opening/closing door 11 is opened and closed once, the ratchet 39 is moved via the lever 43 to its claw portion 39. It is rotated only in one direction by one pitch of a.

Reference numeral 45 denotes a switch consisting of a fixed contact piece 46 and a movable contact piece 47 that is always biased in the direction of the fixed contact piece 46, and the tip end 47a of the movable contact piece 47 is in sliding contact with the outer peripheral surface of the cam body 40, Each time the cam body 40 rotates, it fits into and comes out of the recess 41, and the movable contact piece 47 contacts the fixed contact piece 46 at this time.

In this way, the count switch mechanism 37 is configured to close once when the number of times the opening/closing door 11 is opened and closed reaches a predetermined number (claw portion of the ratchet 39).
The number of claw portions 39 a of 9 is set so as to suppress the amount of frost generated, which is related to the number of times the opening/closing door 11 is opened, to a predetermined amount or less.

The recess 41 of the cam body 40 is designed to prevent the distal end 47a of the movable contact piece 47 of the switch 45 from remaining inserted when this is one of the stop positions of each mode rotation of the ratchet 39. , is slightly shifted from the tip 47a of the movable contact piece 47.

In the refrigeration cycle shown in FIG. 6, the outlet 9a of the compressor 9 is connected to the condenser 10. Main capillary tube 4
8. Solenoid valve 49. Evaporator in refrigerator compartment 87. Connecting pipe 5
0. First cooler 16. Communication pipe 51 and second cooler 1
7 in the above order to the inlet 9b of the compressor 9, and further between the outlet of the main capillary tube 48 and the inlet of the second cooler 17 is an auxiliary capillary tube 48a.
is connected.

Note that the configuration for controlling this refrigeration cycle can be understood from the following explanation, so it will not be described here.

Next, to explain the operation of the above configuration, if the internal temperatures of the freezing compartment 6 and the refrigerator compartment 8 are equal to or higher than the set values, the compressor 9 is being operated and the solenoid valve 49 is being opened. There is.

Therefore, the liquid refrigerant discharged from the condenser 10 passes through the main capillary tube 48 and the solenoid valve 49 to the evaporator 7.
, the first cooler 16 and the second cooler 17 in this order, and at this time, the liquid refrigerant evaporates in the evaporator 7, the first cooler 16 and the second cooler 17, and this evaporated refrigerant In short, the vaporized refrigerant returns to the compressor 9 and is sent to the condenser 10, where it is liquefied again and discharged from the condenser 10, and this process is repeated to cool the freezer compartment 6 and the refrigerator compartment 8.

When the inside of the refrigerator compartment 8 is cooled to the set temperature, the solenoid valve 49 is closed, and the liquid refrigerant that has passed through the condenser 10 and the main capillary tube 48 is transferred to the evaporator 7 and the first cooler. 16 and flows into the auxiliary capillary tube 48a, which then returns to the compressor 9 through the second cooler 17, and cooling of the freezing compartment 6 continues only by the second cooler 17 of the freezer 3. be done.

When the internal temperature of the freezer compartment 6 reaches the set temperature or lower, the operation of the compressor 9 is stopped, and the refrigeration cycle operation is stopped.

When the internal temperature of the freezer compartment 6 reaches the set temperature or higher, the compressor 9 is operated again, the solenoid valve 49 is opened, and the temperature control as described above is started.

In such a refrigeration cycle, of the first cooler 16 and the second cooler 17, the second cooler 17 prevents liquid refrigerant from passing through either the solenoid valve 49 or the auxiliary capillary tube 48a. 5 is always larger than that of the first cooler 16 due to the fact that the total volume of the evaporator line 25 is larger than that of the evaporator line 34 of the first cooler 16, etc. Since the temperature is set to be lower than ℃, when humid outside air enters the freezer compartment 6 when the opening/closing door 11 is opened, the temperature is set to be lower than that of the second cooler 16 rather than to the first cooler 16. Cooler 1
At this time, a slight amount of frost may form on the first cooler 16 as well, but the frost is transferred to the second cooler 17 due to a sublimation phenomenon.
will be transferred to.

By the way, when the door 11 is repeatedly opened and closed in this way and reaches a predetermined number of times, the switch 45 of the count switch mechanism 37 is closed and immediately opened, but the switch 45 is temporarily connected. As a result, a relay switch (not shown) is self-held, and the first, second, and third defrosting heaters 26, 27, and 28 are energized.

As a result, the frost in the second cooler 17 is melted, and the defrosting water flows down along the slope of the ceiling surface section 21 to the back surface section 22 without falling on the way, and further travels along this back surface section 22. The drain port 3 is guided by the water receiving stages 23, 23.
0 and from there is led to the water receiving gutter 15 via the drain pipe 13.

When the dew on the second cooler 17 is removed in this way, the surface temperature of the second cooler 17 rises rapidly.
A temperature control switch (not shown) senses this and opens the self-holding circuit of the relay, and the first, second, and third defrosting heaters 26, 27, and 28 are cut off, and the compressor 9 starts operating. The refrigeration cycle is then returned to normal operation.

In the freezer compartment 6 controlled as described above, frost is mainly formed on the upper second cooler 17 that is less likely to come into contact with stored items, and the ceiling surface portion 21 of the second cooler 17 is Since the structure is such that the defrosting water is tilted downwardly backward to allow the defrosting water to naturally flow down to a specific part to prevent it from dripping into the freezing compartment 6, even if the defrosting operation is performed with stored items stored, The stored items are not directly exposed to defrosting heat or come into contact with defrosting water, and deterioration of the stored items due to the defrosting operation can be prevented.

Therefore, as in the above embodiment, the defrosting operation can be carried out regardless of whether stored items are stored or not.

Now, it is important that the freezer compartment 6 not only freezes and stores stored items in general, but also performs rapid cooling such as making ice, and for this reason, in this embodiment, in addition to the second cooler 17 that concentrates frost formation, It is equipped with a first cooler 16, but if this first cooler 16 forms the lower wall of the freezer compartment 6, the ice tray should be If water spills when placed on the cooler 16, the second cooler 1
It is conceivable that it may remain on the surface of 6 and freeze there.

However, according to this embodiment, the first cooler 16 is located above the bottom plate 18, which is the lower wall of the freezer compartment 6, and has its upper surface as the mounting surface 16a, and is slightly inclined toward the opening 35. This allows water to fall from the mounting surface 16a, so even if water from an ice cube tray or the like spills onto the mounting surface 16a of the first cooler 16, the water will not flow. It falls onto the bottom plate 18 and there is no freezing on the second cooler 16.

Moreover, since the bottom plate 18 is made of a heat insulating material, the bottom plate 18
Water that falls above does not freeze here.

In the above embodiment, by slightly inclining the first cooler 16, the second cooler 16 is placed on its mounting surface 16.
Although the structure allows water to fall from a, the structure that allows water to fall is not limited to this, for example, a large number of small holes are formed in the first cooler 16, and the water is passed through the placement surface 16a. of water may be allowed to fall onto the bottom plate 18.

In this case, the first cooler 16 may be arranged horizontally.

Furthermore, it goes without saying that the first cooler 16 can be used not only for placing ice cube trays, but also for storing other general storage items.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without departing from the gist.

As is clear from the above description, the present invention includes a bottom plate made of a heat insulating material forming a lower wall of a freezing compartment, and a bottom plate located above the bottom plate in the freezing compartment, on which stored items can be placed. A first cooler that allows water to fall from its mounting surface, and a second cooler that has a ceiling surface that forms the upper wall of the freezer compartment that is sloped downward to the rear and is set at a lower temperature than the first cooler. It is equipped with a cooler and a defrosting heater attached to this second cooler, which mainly prevents frost from forming in the upper part of the freezer compartment where food and other stored items are unlikely to come into contact with it. Since the defrosting water is concentrated and the defrosting water is naturally flowed down in a specific direction, there is no risk of deterioration of the stored items due to the defrosting heat and defrosting water even if the defrosting operation is performed with the stored items stored. Therefore, the main objective is to enable defrosting operation regardless of whether stored items are stored or not, and in particular, to allow water to remain in the first cooler even if water spills into the first cooler. This eliminates the formation of ice in the first cooler, and also eliminates the formation of ice on the bottom plate. Overall, it is possible to reliably eliminate ice in the freezing chamber, thereby thawing the ice. Therefore, it is possible to provide a refrigerator that has various excellent effects such as eliminating the need for a heater.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a vertical side view of the refrigerator, Fig. 2 is a sectional view taken along line II-II in Fig. 1, Fig. 3 is an exploded perspective view of the freezer, and Fig. 4 is a cross-sectional view of the refrigerator. A developed view of the second cooler, and Figure 5 is a longitudinal cross-sectional side view of the count switch mechanism.
Figure 6 is a configuration diagram of a refrigeration cycle.≦ In the figure, 3 is a freezer, 6 is a freezer compartment, 11 is an opening/closing door, and 16
and 16 a is the first cooler and mounting surface, 17 is the second cooler, 18 is the bottom plate, 19 is the left side plate, 20 is the right side plate, 2
1 is a ceiling surface part, 22 is a rear part, 25 is an evaporation pipe line, 26 is a first defrost heater, 27 is a second defrost heater, 28 is a third defrost heater, and 34 is an evaporation pipe line. , 35 is an opening, 37
39 is a count switch mechanism, 39 is a ratchet, 42 is a moving body, 43 is a lever, and 45 is a switch.

Claims (1)

[Scope of utility model registration request] A bottom plate made of a heat insulating material and forming a lower wall of the freezing compartment; a cooler, a second cooler whose ceiling surface part forming the upper wall of the freezer compartment is tilted downward to the rear and set to a lower temperature than the first cooler; and a second cooler attached to the second cooler. A refrigerator equipped with a defrosting heater.