KR20190101669A - Refrigerator - Google Patents

Abstract

According to the present invention, a refrigerator comprises: an inner case forming a storage chamber; a cold air duct guiding flow of the air in the storage chamber and forming a heat exchange space along with the inner case; an evaporator located in the heat exchange space between the inner case and the cold air duct; a bypass flow path arranged in the cold air duct in a recessed shape, and enabling the air to bypass the evaporator to flow; a sensor arranged in the bypass flow path and having different output values in accordance with a flow rate of the air flowing in the bypass flow path; a defrosting means for removing a frost generated on a surface of the evaporator; and a control unit controlling the defrosting means based on the output values of the sensor.

Description

Refrigerator {Refrigerator}

The present specification relates to a refrigerator.

A refrigerator is a home appliance that can store an object such as food at a low temperature in a storage compartment provided in a cabinet. Since the storage compartment is surrounded by a heat insulating wall, the interior of the storage compartment may be maintained at a temperature lower than an external temperature.

The storage compartment may be divided into a refrigerating compartment or a freezing compartment according to the temperature band of the storage compartment.

The refrigerator may include an evaporator for supplying cold air to the storage compartment. The air in the storage compartment flows to the space where the evaporator is located and is cooled in the process of heat exchange with the evaporator, and the cooled air is supplied to the storage compartment again.

At this time, when the air heat-exchanged with the evaporator contains water, when the air is heat-exchanged with the evaporator, moisture condenses on the surface of the evaporator to form frost on the surface of the evaporator.

Since the frost acts as a flow resistance of the air, the greater the amount of frost that condenses on the surface of the evaporator, the greater the frost flow resistance, thereby lowering the heat exchange efficiency of the evaporator and increasing power consumption.

Thus, the refrigerator further includes defrosting means for defrosting the evaporator.

Prior art document Korean Laid-Open Patent Publication No. 2000-0004806 discloses a defrosting period variable method.

In the prior literature, the defrost cycle is adjusted using the cumulative operating time of the compressor and the outside air temperature.

However, when determining the defrosting cycle using only the cumulative operating time and the outside temperature of the compressor as in the prior art, there is a problem in that it does not reflect the amount of frost in the evaporator (hereinafter referred to as "deposition amount"), and thus actually defrosting. There is a disadvantage that it is difficult to accurately determine the time required.

That is, according to various environments, such as the user's refrigerator usage pattern, the degree of air holding moisture, the amount of implantation of the evaporator may be large or small. In the case of the prior literature, the disadvantage of determining the defrosting cycle is not reflected in the various environments. have.

Therefore, the cooling performance is deteriorated because the defrosting does not start despite a large amount of defrosting, or the defrosting starts even though the defrosting amount is small, resulting in an increase in power consumption due to unnecessary defrosting.

An object of the present invention is to provide a refrigerator capable of determining whether or not defrosting operation is performed using a parameter that depends on the amount of implantation of the evaporator.

Another object of the present invention is to provide a refrigerator capable of accurately determining a defrosting necessary time according to an amount of implantation of an evaporator by using a bypass flow path for detecting an implantation.

Another object of the present invention is to provide a refrigerator capable of minimizing the length of a flow path for detecting an idea.

Another object of the present invention is to provide a refrigerator which can accurately determine the defrosting point even when the accuracy of the sensor used for determining the defrosting point is low.

Another object of the present invention is to provide a refrigerator in which frost is prevented from being generated around a sensor for detecting an idea.

Another object of the present invention is to provide a refrigerator in which liquid is prevented from flowing into a bypass flow path for detecting an idea.

The refrigerator for solving the said subject is provided with the cold air duct inside the inner case which forms a storage chamber, and a cold air duct forms a heat exchange space with an inner case.

An evaporator is positioned in the heat exchange space, a bypass passage having a recessed shape is formed in the cold air duct, and a sensor is disposed in the bypass passage.

In the present invention, the sensor has a different output value according to the flow rate of the air flowing through the bypass flow path, the defrosting necessary time of the evaporator may be determined using the output value of the sensor.

The refrigerator of the present embodiment includes defrosting means for removing frost generated on the surface of the evaporator; And a controller for controlling the defrosting means based on an output value of the sensor, and when it is determined that defrosting is necessary, the controller may operate the defrosting means.

In the present embodiment, the sensor may include a heating element, a sensing element for sensing a temperature of the heating element, and a sensor PC in which the heating element and the sensing element are installed.

In the present embodiment, when the difference between the temperature detected by the sensing element when the heating element is turned on and the temperature detected by the sensing element when the heating element is turned off is equal to or less than a reference temperature value, defrost is necessary. Can be judged.

In the present embodiment, the refrigerator may further include a flow channel cover covering the bypass flow path to partition the bypass flow path from the heat exchange space.

In the present embodiment, the cold air duct includes a vertically extending surface which is a surface on which the bypass flow path is formed, and the flow path cover extends from the cover plate and the cover plate to cover the bypass flow path. By including a barrier that protrudes downward from the upper and lower extension surface in the state covering the bypass flow path, it is possible to reduce the flow rate of air flowing into the bypass flow path before implantation.

In the present embodiment, the bypass flow path may extend in a straight line shape in the up and down direction so that the length of the bypass flow path is minimized.

The barrier which is drawn out of the bypass flow passage may include a rear barrier continuously extending from the cover plate and positioned adjacent to the evaporator, a plurality of side barriers extending from left and right spaces apart from the rear barrier, and the plurality of barriers. And a front barrier that is connected to the side barrier and spaced apart from the rear barrier and positioned opposite the evaporator with respect to the rear barrier.

In the present embodiment, the cold air duct may further include an inclined surface extending inclined at the end of the upper and lower extension surface, and guides air to the evaporator side.

In this embodiment, the barrier may include a slot to allow air flowing along the inclined surface to flow to the evaporator side. The slot provides a passage of air and may be formed in the rear barrier as an example.

In this embodiment, the sensor may be disposed to be spaced apart from the bottom wall of the bypass flow path and the flow path cover to prevent frost from being generated around the sensor in the bypass flow path.

In order to improve detection accuracy of the sensor, the sensor may be disposed to be spaced apart from an inlet and an outlet of the bypass flow path, and may be positioned at a point that bisects the distance between the bottom wall and the cover plate in the bypass flow path. .

In the present embodiment, the bypass flow path is formed in a vertical direction with the cold air inflow hole formed in the cold air duct so that the air discharged from the outlet of the bypass flow path is prevented from being affected by the flow rate of the air flowing into the cold air inflow hole. It may be arranged to overlap.

In addition, the outlet of the bypass passage may be located in an outer region of the restricted region having a diameter larger than that of the blowing fan based on the center of the blowing fan provided in the cold air duct.

In this embodiment, in order to block liquid from flowing into the bypass flow path, a blocking rib may be provided above the bypass flow path in the cold air duct.

For example, the left and right minimum lengths of the blocking ribs may be larger than the left and right minimum widths of the bypass flow path, and the entire left and right sides of the bypass flow path may be disposed to overlap the blocking ribs in the vertical direction.

According to the proposed invention, since the defrosting necessary time is determined by using a sensor whose output value varies according to the amount of implantation of the evaporator in the bypass passage, there is an advantage in that the defrosting necessary time can be accurately determined.

In addition, in the present invention, since the bypass passage extends in a straight line shape in the vertical direction from the cold air duct, there is an advantage that the length of the bypass passage can be minimized.

Further, in the present invention, since the sensor is located at a point where the influence of the flow change amount is small in the bypass flow path, and is located in the central area of the flow path in the full flow development area, the detection accuracy of the sensor can be improved.

In addition, in the present invention, since the sensor is disposed spaced apart from the bottom of the bypass flow path and the flow path cover, frost is prevented from being generated around the sensor.

In addition, in the case of the present invention, since the flow path cover includes a barrier that protrudes outward of the bypass flow path, the flow rate of the bypass flow path before the formation is minimized, and thus the determination accuracy of the defrost need time by the sensor may be improved.

In addition, according to the present invention, as the blocking rib is provided above the bypass flow passage, it is possible to prevent the liquid from flowing into the bypass flow passage.

1 is a longitudinal sectional view schematically showing the configuration of a refrigerator according to one embodiment of the present invention;
Figure 2 is a perspective view of the cold air duct according to an embodiment of the present invention.
3 is an exploded perspective view showing a state in which a flow path cover and a sensor are separated from a cold air duct;
FIG. 4 is a diagram showing air flow in a heat exchange space and a bypass flow path before and after implantation of an evaporator; FIG.
5 is a view schematically showing a state where a sensor is disposed in a bypass flow path.
6 illustrates a sensor according to an embodiment of the present invention.
7 is a diagram showing thermal flow around a sensor according to the flow rate of air flowing through a bypass flow path.
8 shows the sensor position on the bypass flow path.
9 shows air flow patterns in the bypass.
10 is a view showing the flow of air in the state in which the sensor is installed in the bypass flow path.
11 is a view showing the arrangement of the bypass flow path and the flow path cover in the cold air duct according to an embodiment of the present invention.
12 is an enlarged view showing ribs for preventing a bypass flow path and defrost water inflow according to an embodiment of the present invention;
13 is a view showing a barrier of the flow path cover according to an embodiment of the present invention.
14 is a view showing an amount of change in temperature detected by a sensor according to the protruding length of the barrier.
15 is a cross-sectional view of a barrier of a flow path cover according to an embodiment of the present invention.
FIG. 16 shows a change in air flow with and without slots in the barrier. FIG.
FIG. 17 is a view illustrating an amount of change in temperature sensed by a sensor according to a length of a slot formed in a barrier.
18 is a view showing the flow of air introduced into the heat exchange space of the present invention
19 is a control block diagram of a refrigerator according to one embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function interferes with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

1 is a vertical cross-sectional view schematically showing the configuration of a refrigerator according to an embodiment of the present invention, Figure 2 is a perspective view of a cold air duct according to an embodiment of the present invention, Figure 3 is a flow path cover and sensor in the cold air duct An exploded perspective view showing the separated state.

1 to 3, the refrigerator 1 according to an embodiment of the present invention may include an inner case 12 forming a storage compartment 11.

The storage compartment 11 may include one or more of a refrigerating compartment and a refrigerating compartment.

A cold air duct 20 is formed in the rear space of the storage compartment 11 to form a flow path through which cold air supplied to the storage compartment 11 flows. In addition, an evaporator 30 is disposed between the cold air duct 20 and the rear wall 13 of the inner case 12. That is, a heat exchange space 222 in which the evaporator 30 is disposed is defined between the cold air duct 20 and the rear wall 13.

Accordingly, the air in the storage compartment 11 flows into the heat exchange space 222 between the cold air duct 20 and the rear wall 13 of the inner case 12 to exchange heat with the evaporator 30, and the cold air After flowing inside the duct 20, it is supplied to the storage chamber 11.

The cold air duct 20 may include, but is not limited to, a first duct 210 and a second duct 220 coupled to a rear surface of the first duct 210.

The front surface of the first duct 210 faces the storage chamber 11, and the rear surface of the first duct 220 faces the rear wall 13 of the inner case 12.

A cold air passage 212 may be formed between the first duct 210 and the second duct 220 in a state in which the first duct 210 and the second duct 220 are coupled to each other.

In addition, a cold air inlet hole 221 may be formed in the second duct 220, and a cold air discharge hole 211 may be formed in the first duct 210.

The cold air passage 212 may be provided with a blowing fan (not shown). Therefore, when the blowing fan is rotated, air passing through the evaporator 13 flows into the cold air flow path 212 through the cold air inlet hole 221, and the storage chamber 11 through the cold air discharge hole 211. To be discharged.

The evaporator 30 may be located between the cold air duct 20 and the rear wall 13, and the evaporator 30 may be located below the cold air inlet hole 221.

Therefore, the air of the storage chamber 11 is introduced into the cold air inlet hole 221 after the heat exchange with the evaporator 30 while rising.

According to this arrangement, if the amount of implantation of the evaporator 30 is increased, the amount of air passing through the evaporator 30 is reduced, thereby reducing the heat exchange efficiency.

In the present embodiment, the defrosting necessary time of the evaporator 30 may be determined by using a parameter that changes according to the amount of implantation of the evaporator 30.

As an example, in the cold air duct 20, at least a part of the air for flowing through the heat exchange space 222 is bypassed, and an idea of detection is performed to determine a defrosting necessary time using a sensor whose output is different according to the flow rate of the air. It may further include.

The implantation detecting means may include a bypass passage 230 for bypassing at least a portion of the heat exchange space 222 and a sensor 270 positioned on the bypass passage 230. .

Although not limited, the bypass flow path 230 may be formed to be recessed in the first duct 210. Alternatively, the bypass flow path 230 may be provided in the second duct 220.

The bypass flow path 230 may be formed as the mouth of the first duct 210 or the second duct 220 is recessed in a direction away from the evaporator 30.

The bypass flow path 230 may extend in the vertical direction from the cold air duct 20.

The bypass flow path 230 may face the evaporator 30 within a left and right width range of the evaporator 30 so that the air in the heat exchange space 222 may be bypassed to the bypass flow path 230. Can be arranged.

The implantation detecting means may further include a flow path cover 260 for allowing the bypass flow path 230 to be partitioned from the heat exchange space 222.

The flow path cover 260 may be coupled to the cold air duct 20 and may cover at least a portion of the bypass flow path 230 extending upward and downward.

The flow path cover 260 may include a cover plate 261, an upper extension part 262 extending from an upper side of the cover plate 261, and a barrier 263 provided below the cover plate 261. Can be. A detailed shape of the flow path cover 260 will be described later with reference to the drawings.

FIG. 4 is a diagram showing air flow in a heat exchange space and a bypass flow path before and after implantation of an evaporator.

4 (a) shows the air flow before implantation, and FIG. 4 (b) shows the air flow after implantation. In this embodiment, for example, it is assumed that after the defrosting operation is completed, the state before the implantation.

First, referring to FIG. 4A, when no frost is present in the evaporator 30 or the amount of implantation is significantly small, most of the air passes through the evaporator 30 in the heat exchange space 222 (arrow). A). On the other hand, some of the air may flow through the bypass flow path 230 (see arrow B).

Referring to FIG. 4B, when the amount of implantation of the evaporator 30 is large (defrost is necessary), since the frost of the evaporator 30 acts as a flow path resistance, the heat exchange space 222 flows. The amount of air to be reduced is reduced (see arrow C), and the amount of air flowing through the bypass flow path 230 is increased (see arrow D).

As such, the flow rate (or flow rate) of air flowing through the bypass flow path 230 varies according to the amount of implantation of the evaporator 30.

In this embodiment, the sensor 270, the output value is changed according to the change in the flow rate of the air flowing through the bypass flow path 230, it can be determined whether or not defrosting based on the change in the output value.

Hereinafter, the structure and principle of the sensor 270 will be described.

5 is a view schematically showing a state in which a sensor is disposed in the bypass flow passage, FIG. 6 is a view showing a sensor according to an embodiment of the present invention, and FIG. 7 is a flow rate of air flowing through the bypass flow passage. Figure is a view showing the heat flow around the sensor according.

5 to 7, the sensor 270 may be disposed at a point in the bypass flow path 230. Accordingly, the sensor 270 may be in contact with air flowing along the bypass flow path 230, and the output value may be changed in response to a change in the flow rate of air.

The sensor 270 may be disposed at a position spaced apart from each of the inlet 231 and the outlet 232 of the bypass flow path 230. A detailed position of the sensor 270 in the bypass flow path 230 will be described later with reference to the drawings.

Since the sensor 270 is positioned on the bypass flow path 230, the sensor 270 may face the evaporator 30 within a left and right width range of the evaporator 30.

The sensor 270 may be, for example, a heating temperature sensor. In detail, the sensor 270 includes a sensor PC 271, a heating element 273 installed in the sensor PC 271, and a temperature of the heating element 273 provided in the sensor PC 271. It may include a sensing element 274 for sensing.

The heat generating element 273 may be a resistor that generates heat when a current is applied.

The sensing element 274 may sense the temperature of the heating element 273.

When the flow rate of the air flowing in the bypass flow path 230 is small, the amount of cooling of the heat generating element 273 by the air is small, the temperature detected by the sensing element 274 is high.

On the other hand, if the flow rate of air flowing in the bypass flow path 230 is large, the cooling amount of the heat generating element 273 is increased by the air flowing in the bypass flow path 230, the sensing element 274 The sensed temperature will be low.

The sensor PCB 271 may include a temperature detected by the sensing element 274 in the off state of the heating element 273, and a temperature detected by the sensing element 274 in the on state of the heating element 273. You can judge the difference.

The sensor PC 271 may determine whether a temperature difference value (for example, a maximum value) in the on / off state of the heating element 273 is less than or equal to the reference difference value.

For example, referring to FIG. 4 and FIG. 7, when the amount of implantation of the evaporator 30 is small, the flow rate of air flowing into the bypass flow path 230 is small. In this case, there is little heat flow of the heat generating element 273, and the amount cooled by air is small.

On the other hand, in the case where the amount of implantation of the evaporator 30 is large, the flow rate of air flowing into the bypass flow path 230 is large. Then, the heat of the heat generating element 273 is increased by the air flowing along the bypass flow path 230 and the amount of cooling is large.

Therefore, when the amount of implantation of the evaporator 30 is large, the temperature detected by the sensing element 274 is smaller than the temperature sensed by the sensing element 274 when the amount of implantation of the evaporator 30 is small.

Therefore, in the present exemplary embodiment, a difference between a temperature detected by the sensing element 274 while the heating element 273 is turned on and a temperature detected by the sensing element 274 when the heating element 273 is turned off If it is less than the reference temperature difference, it may be determined that defrost is necessary.

According to the present embodiment, the sensor 270 detects a change in the temperature of the heating element 273 that is varied by the air whose flow rate is variable according to the amount of implantation, and thus defrosting according to the amount of implantation of the evaporator 30. Accurately determine the time required.

The sensor 270 is a sensor housing 271 such that the air flowing through the bypass flow path 230 is prevented from directly contacting the sensor PC 271, the heating element 273, and the temperature sensor 274. It may further include. In the state in which the sensor housing 271 is opened, the wire connected to the sensor PCB 271 may be drawn out, and the opened portion may be covered by the cover part.

The sensor housing 271 may surround the sensor PCB 271, the heat generating element 273, and the temperature sensor 274.

FIG. 8 is a diagram showing the position of the sensor on the bypass flow path, FIG. 9 is a view showing the air flow pattern in the bypass flow path, and FIG. 10 is a view showing the flow of air in the state where the sensor is installed in the bypass flow path. Drawing.

5 and 8 to 10, the flow path cover 260 may cover a portion of the bypass flow path 230 in the vertical direction.

Accordingly, the air flows along the region of the bypass passage 230 where the passage cover 260 exists (which is a region partitioned from the heat exchange space).

As described above, the sensor 270 may be spaced apart from the inlet 231 and the outlet 232 of the bypass flow path 230.

The sensor 270 may be disposed at a location that is less affected by the flow change of air flowing through the bypass flow path 230.

For example, the sensor 270 is located at least 6Dg (or 6 * diameter diameter) at an inlet of the bypass flow path 230 (actually, a lower end portion of the flow path cover 260) (hereinafter referred to as “inlet reference”). Location ").

Further, the sensor 270 is at least 3Dg (or 3 * diameter diameter) spaced apart from the exit of the bypass flow path 230 (actually, the upper end of the flow path cover 260) (hereinafter referred to as “outlet reference position”). It can be arranged in).

In the process of introducing air into the bypass passage 230 or the process of discharging from the bypass passage 230, the flow change is severe. If the flow change amount of the air is large, it may be determined that defrosting is necessary despite the small amount of implantation. Therefore, in the present embodiment, when air flows along the bypass flow path 230, the sensor 270 is installed at a position where the flow change is small to reduce the detection error.

For example, the sensor 270 may be located within a range between the inlet reference position and the outlet reference position. The sensor 270 may be located closer to the outlet reference position than to the inlet reference position. Thus, the sensor 270 may be located closer to the outlet 232 than the inlet 231 in the bypass flow path 230.

Since the flow is stabilized at least at the inlet reference position and the flow is stabilized up to the outlet reference position, placing the sensor 270 close to the outlet reference position results in the flow stabilized air being the sensor 270. ).

Therefore, it is not influenced other than the change of the flow due to the large and small amount of implantation amount, the sensing accuracy of the sensor 270 can be improved.

In addition, referring to FIG. 9, the air becomes a fully developed flow form as it moves away from the inlet 231 in the bypass flow path 230.

Since the sensor 270 is very sensitive to a change in the flow of air, when the sensor 270 is positioned at the center of the bypass flow path 230 at the point where the sensor 270 has full development flow, Accurately detect changes in flow.

Therefore, as illustrated in FIG. 10, the sensor 270 may be installed in the central region of the bypass flow path 230.

In this case, the center area of the bypass flow path 230 is an area including a point that bisects the bottom wall 236 of the portion recessed in the bypass flow path 230 and the flow path cover 260. That is, a part of the sensor 270 may be located at a point bisecting the bottom wall 236 of the portion recessed in the bypass flow path 230 and the flow path cover 260.

Referring to FIG. 10, the sensor 270 may be spaced apart from the bottom wall 236 of the bypass flow path 230 and the flow path cover 260. Accordingly, some of the air in the bypass flow path 230 flows through the space between the bottom wall 236 and the sensor 270, and another part of the air flows between the sensor 270 and the flow path cover 260. It can flow.

In summary, the sensor 270 may be installed in the central region of the flow path at the point where the change of air flow is minimal in the bypass flow path 230 and at the point where the complete development flow flows, so that the detection accuracy may be improved.

This arrangement allows the sensor 270 to respond sensitively to changes in the flow of air due to the high and low amount of implantation. That is, the amount of temperature change detected by the sensor 270 may be increased.

When the amount of change in the temperature detected by the sensor 270 is increased in this way, even when the temperature detection accuracy of the sensor 270 itself is reduced, it is possible to determine the defrosting necessary time. Since the temperature sensing precision of the sensor 270 itself is related to price, even when the sensor 270 having a low precision and a relatively low price is used, it is possible to determine the defrosting necessary time.

FIG. 11 is a view illustrating an arrangement of a bypass flow path and a flow path cover in a cold air duct according to an embodiment of the present invention.

Referring to FIG. 11, the lower end portion 260a of the flow passage cover 260 may be positioned at a height similar to the lower end of the evaporator 30 or lower than the lower end of the evaporator 30.

According to this arrangement, when the amount of implantation of the evaporator 30 is increased, air can easily flow into the bypass flow path 230.

In this embodiment, since the blowing fan is located in the cold air duct 20, when the blowing fan is rotated, the air inlet hole 221 of the cold air duct 20 becomes a low pressure region.

In addition, since air flows from the lower side to the upper side along the evaporator 30, the lower side of the evaporator 30 is a high pressure region and the upper side of the evaporator 30 is a low pressure region based on the evaporator 30. .

In this embodiment, the upper end portion 260b of the flow path cover 260 may be located in the low pressure region.

Therefore, since the lower end portion 260a of the flow passage cover 260 is located in the high pressure region and the upper end portion 260b is located in the low pressure region, air flows to the bypass flow passage 230.

In addition, in the present embodiment, the upper end portion 260b of the flow path cover 260 may be located higher than the evaporator 30. Therefore, the air discharged from the bypass flow path 230 may be less affected by the air passing through the evaporator 30.

The bypass flow path 230 may be disposed so as not to overlap the air flow hole 221 in the vertical direction. This is to prevent the air at the outlet 232 of the bypass flow path 230 from being affected by the air flowing into the air flow hole 221.

The outlet 232 of the bypass flow path 230 may be located lower than the center C of the blowing fan. In addition, the outlet 232 of the bypass flow path 230 may be located lower than the lowest point of the air flow hole (221).

In this embodiment, the air flow hole 221 has a diameter of D1 and the diameter of the blowing fan is D2. The diameter D2 of the blowing fan may be larger than the diameter D1 of the air flow hole 221.

A restricted area having a diameter D3 larger than the diameter D2 of the blower fan may be set based on the center C of the blower fan, and the outlet 232 of the bypass flow path 230 may be outside the restricted area having a diameter D3. It can be located in the area.

In addition, in order to minimize the length of the bypass flow path 230, the bypass flow path 230 may extend in a straight line shape in a vertical direction in an area outside the restriction area.

At this time, although not limited, the diameter D3 may be set to more than 1.5 times the diameter of the blowing fan.

Since air flows into the cold air duct 20 through the air flow hole 221, the flow velocity of the air flow hole 221 is large.

In addition, the flow velocity of air in the region having the diameter D3 is high due to the high flow velocity of the air flow hole 221.

If the outlet 232 of the bypass flow path 230 is located in the restricted region, there is a change in the flow of air in the bypass flow path 230 due to the influence of the high flow rate so that the sensor 270 ), The accuracy of detection becomes low.

Therefore, in the present embodiment, while reducing the length of the bypass flow path 230, the bypass flow path 230 in a straight form so that the flow rate around the air flow hole 221 is not affected by the fast air. Extending, the outlet 232 may be located outside of the restriction area.

12 is an enlarged view illustrating ribs for preventing a bypass flow path and defrost water inflow according to an embodiment of the present invention.

Referring to FIGS. 10 and 12, since the air flowing through the bypass flow path 230 contains water, the sensor 270 and the bypass flow path 230 are formed in the bypass flow path 230. In the flow path between the walls of the capillary phenomenon may occur.

Therefore, in the present embodiment, the sensor 270 may be spaced apart from the bottom wall 236 of the bypass flow path 230 and the flow path cover 260 to prevent in-flow implantation.

Although not limited, the sensor 270 may be designed to be spaced apart from each of the bottom wall 236 and the flow path cover 260 by 1.5 mm or more (which may be referred to as a “minimum separation distance”).

Therefore, the depth D of the bypass flow path 230 may be equal to or greater than (2 * minimum separation distance) and the thickness of the sensor 270.

Meanwhile, the left and right widths W of the bypass flow path 230 may be larger than the depth D.

When the left and right widths W of the bypass flow path 230 are formed larger than the depth D, when the air flows through the bypass flow path 230, the contact area between the air and the sensor 270 is increased. As a result, the amount of change in temperature detected by the sensor 270 may be increased.

The cold air duct 20 may be provided with a blocking rib 240 for preventing a liquid such as defrost water or moisture formed during the defrosting process from being introduced into the bypass flow path 230.

The blocking rib 240 may be located above the outlet 232 of the bypass flow path 230. The blocking rib 240 may have a shape of a protrusion protruding from the cold air duct 20.

The blocking rib 240 spreads the falling liquid to the left and right to prevent the inflow into the bypass flow path 230.

The blocking rib 240 may be formed in a straight line shape from side to side, or may be formed in a rounded shape so as to be convex upward.

The blocking ribs 240 may be disposed to overlap the entire left and right sides of the bypass flow path 230 in an up and down direction, and may be formed such that a minimum left and right lengths are larger than the left and right widths of the bypass flow path 230.

When the blocking rib 240 is formed in the cold air duct 20, since the blocking rib 240 serves as a flow resistance of air, the left and right minimum lengths of the blocking rib 240 are the bypass flow path 230. It may be set to less than twice the width (W) of the left and right.

As the blocking rib 240 is located closer to the bypass flow path 230, the length of the blocking rib 240 may be reduced. On the other hand, the defrost water flows over the blocking rib 240 and passes through the bypass flow path. There is a fear of entering into (230).

Accordingly, the blocking rib 240 may be spaced apart from the bypass flow path 230 in the vertical direction, and the maximum separation distance may be set within a left and right width (W) range of the bypass flow path 230.

The cold air duct 20 may include a sensor installation groove 235 recessed to install the sensor 270.

The cold air duct 20 includes a bottom wall 236 and both side walls 233 and 234 for forming the bypass flow path 230, and the sensor installation groove 235 includes both side walls 233, 234).

In the state where the sensor 270 is installed in the sensor installation groove 235, the sensor 270 may be spaced apart from the bottom wall 236 and the flow channel cover 260 by a minimum separation distance as described above.

FIG. 13 is a view showing a barrier of a flow path cover according to an embodiment of the present invention, FIG. 14 is a view showing an amount of change of temperature detected by a sensor according to the protruding length of the barrier, and FIG. Is a cross-sectional view of the barrier of the flow path cover.

16 is a view showing a change in the flow of air with or without a slot in the barrier, Figure 17 is a view showing the amount of change in temperature detected by the sensor according to the length of the slot formed in the barrier.

18 is a view showing the flow of air introduced into the heat exchange space of the present invention.

3, 8, 12 to 18, the flow path cover 260 may include a cover plate 261, an upper extension 262, and a barrier 263.

The cover plate 261 covers the bypass flow path 230 and may be formed in a thin plate shape. For example, the cover plate 261 may cover the bypass flow path 230 in a state spaced apart from the bottom wall 236.

In the cold air duct 20, a mounting groove 235a for mounting the cover plate 261 may be vertically long. When the cover plate 261 is seated in the seating groove 235a, the outer surface of the cover plate 261 may form a surface that is substantially continuous with the cold air duct 20.

The upper extension part 262 may also cover a portion of the bypass flow path 230, and may extend inclined at a predetermined angle from the cover plate 261.

The upper extension portion 262 is configured to be inclined to extend from the cover plate 261 correspondingly as a portion of the cold air duct 20 (hereinafter referred to as “upward inclined portion”) is inclined.

If the cold air duct 20 does not include an upper mirror portion, the upper extension portion 262 may be omitted so that the cover plate 261 may be formed in a straight line shape.

The upper extension 262 covers only a part of the bypass flow path 230. Thus, a portion of the bypass flow path 230 is exposed to the outside to become the outlet 232.

The barrier 263 is positioned outside the bypass flow path 230 while the cover plate 261 covers the bypass flow path 230. For example, the barrier 263 may protrude downward from the vertically extending surface 227 of the cold air duct 20.

Accordingly, a part of the barrier 263 is located in the bypass flow path 230, and the other part protrudes downward from the bypass flow path 230.

Specifically, the barrier 263 may include a rear barrier 267 positioned close to the evaporator 30, a front barrier 264 spaced apart from the front of the rear barrier 267, and the front barrier ( 264 and a plurality of side barriers 265 and 266 connecting the rear barrier 267. The plurality of side barriers 265 and 266 may be spaced apart in the left and right directions. Although not limited, the plurality of side barriers 265 and 266 may be disposed in parallel.

The back barrier 267 is a wall formed continuously with the cover plate 261. The plurality of side barriers 265 and 266 are walls extending forward from the back barrier 267. The front barrier 264 is a wall connecting front ends of the plurality of side barriers 265 and 266.

The front barrier 264 is located opposite the evaporator 30 with respect to the rear barrier 267.

The lower surface of the barrier 263 is opened. Accordingly, a guide flow path 268 that guides air to the bypass flow path 230 is formed in the barrier 263 by the front barrier 264, the plurality of side barriers 265 and 266, and the rear barrier 267. Is formed.

The guide passage 268 is a passage communicating with the bypass passage 230 outside the bypass passage 230. The guide flow path 268 also serves as a bypass flow path.

The cold air duct 20 may have a surface 227 on which the bypass flow path 230 is formed (hereinafter referred to as an “up and down extension surface”) may be a substantially vertical surface.

The bypass passage 230 may extend in a straight line shape in the vertical direction on the vertical extension surface 227.

The cold air duct 20 may further include an inclined surface 228 extending from a lower end of the upper and lower extending surfaces 227. The inclined surface 228 may extend downwardly as the distance from the evaporator 30 increases.

The inclined surface 228 is a surface for guiding the air in the storage chamber 11 to the heat exchange space 222.

Accordingly, the air in the storage compartment 11 may flow upwardly inclined by the inclined surface 228 when viewed from the side of the heat exchange space 222.

In this embodiment, the barrier 263 may serve to limit the inflow of air introduced into the heat exchange space 222 into the bypass flow path 230 when the amount of implantation of the evaporator 30 is small. have.

On the other hand, the barrier 230 may serve to effectively guide the air introduced into the heat exchange space 222 to the bypass flow path 230 when the amount of implantation of the evaporator 30 is large.

As described above, when the flow rate of the air increases as the amount of implantation of the evaporator 30 increases by the barrier 263, the detection accuracy of the sensor 260 may be improved.

That is, if the flow rate of the air is large according to a large amount or a small amount of the amount of implantation of the evaporator 30, the amount of change in temperature sensed by the sensor 270 is increased, so that the determination of the defrosting necessary time may be accurate.

In addition, as described above, when the amount of change in the temperature detected by the sensor 270 increases as the amount of implantation of the evaporator 30 increases and decreases, even when the sensor 270 having a low sensor accuracy is used, Judgment is possible.

In the present exemplary embodiment, the lower end portion of the upper and lower extension surfaces 227 (the boundary between the upper and lower extension surfaces 227 and the inclined surface 228) is extended from the lower end portion 227 to the bypass flow path 230 along the protruding length of the barrier 263. The flow rate of the incoming air can vary.

Referring to Fig. 14, the horizontal axis shows the protruding length of the barrier, and the vertical axis shows the magnitude of the change amount between the temperature before implantation and the temperature after implantation.

When the protruding length of the barrier 263 is small, the flow rate of air flowing through the bypass flow path 230 increases even before implantation.

If the flow rate of the air flowing through the bypass flow path 230 before implantation is large, the temperature variation range of the sensor 270 (eg, the difference between the highest temperature and the lowest temperature) is large, and even after implantation, the bypass flow path ( Since the flow rate of air flowing through the 230 is large, the temperature change range of the sensor 270 is large.

As a result, the amount of change of the temperature of the sensor 270 before implantation and the temperature of the sensor 270 after implantation (for example, the difference between the lowest temperature before implantation and the lowest temperature after implantation) is reduced.

On the contrary, when the protruding length of the barrier 263 becomes long, the flow rate of air flowing through the bypass flow path 230 before implantation decreases. The temperature change width of the sensor 270 before implantation becomes small. On the other hand, since the temperature change width of the sensor 270 after implantation is large, the amount of change in the temperature of the sensor 270 before implantation and the temperature of the sensor 270 after implantation becomes large.

However, if the protruding length of the barrier 263 becomes too long, the flow rate of air flowing into the bypass flow path 230 is reduced not only before the implantation but also after the implantation, and thus the temperature of the sensor 270 before the implantation is implanted. The change amount of the temperature of the sensor 270 afterwards becomes small.

Therefore, the protruding length of the barrier 230 may be set to a value of 10 mm or more and 17 mm or less so that the temperature change amount before and after implantation in the sensor 270 may be greater than or equal to the reference variation.

On the other hand, the lower end of the barrier 230 may be arranged horizontally. For example, the front barrier 264 and the plurality of side barriers 265 and 266 may be located on substantially the same horizontal plane.

In this case, as shown in FIG. 16A, the air in the storage compartment 11 flows upwardly inclined along the inclined surface 228, so that the air passing the front barrier 264 among the inclined air flows through the rear barrier ( When hitting 267, air does not flow to the evaporator 30 and flows to the bypass flow path 230.

In this case, there is a problem that the flow rate of air flowing into the bypass flow path 230 is increased regardless of the amount of implantation.

In the present embodiment, before the implantation, the flow rate of the air flowing in the bypass flow path 230 must be minimum to increase the accuracy of the defrosting time determination.

Accordingly, a slot 269 may be formed in the rear barrier 267 to provide a passage of air so that air passing through the lower end of the front barrier 264 may flow directly to the evaporator 30.

When the slots 269 are formed in the rear barrier 267 as shown in FIG. 16B, the air passing through the lower end of the front barrier 264 does not collide with the rear barrier 267 so that the evaporator 30 may be formed. Can flow directly to the side.

In this embodiment, the air that hits the front barrier 264 flows along the plurality of side barriers 265 and 266 and then flows toward the rear barrier 267.

When the slots 269 are not formed in the rear barrier 267, air flowing along the side barriers 265 and 266 may not flow to the bypass flow path 230 but flow toward the evaporator 30. do.

On the other hand, when the slot 269 is formed in the rear barrier 267, air flowing along the side barriers 265 and 266 flows toward the bypass flow path 230 by the slot 269. do.

Therefore, in the present embodiment, the flow rate of air actually flowing into the bypass flow path 230 includes at least a flow rate of air directly flowing into the guide flow path 268 of the barrier 263 and a circumference of the barrier 263. It may be determined by the flow rate of the air flowing into the barrier 263 along the slot 269 after flowing along.

In the present embodiment, when the length of the slot 269 (height from the lower end of the barrier 262) is small, the flow rate of air flowing into the bypass flow path 230 is large, and the slot 269 is lengthened. The flow rate of air flowing into the bypass flow path 230 is reduced.

However, if the length of the slot 269 is too large, rather, the flow rate of air flowing through the slot 269 after flowing along the side barriers 265 and 266 becomes large, even before implantation. The flow rate of air flowing into the bypass flow path 230 is increased.

Therefore, in the present embodiment, the length of the slot 269 may be set to 4 mm or more and 9 mm or less so that the flow rate of air flowing into the bypass flow path 230 before implantation is minimized. Although not limiting, the length of the slot 269 may be designed to be in the range of 1/5 to 1/2 of the protruding length of the barrier 263.

19 is a control block diagram of a refrigerator according to one embodiment of the present invention.

Referring to FIG. 19, the refrigerator 1 according to an embodiment of the present disclosure includes a defrosting means 50 that operates for defrosting the evaporator 30, and a controller 40 that controls the defrosting means 50. ) May be further included.

The defrosting means 50 may include, for example, a heater. When the heater is turned on, heat generated by the heater is transferred to the evaporator 30 to melt frost generated on the surface of the evaporator 30.

The controller 40 may control the heating element 273 of the sensor 270 to be turned on at a predetermined cycle.

In order to determine the need for defrosting, the heating element 273 may be in an on state for a predetermined time, and the sensing element 274 may sense a temperature of the heating element 273.

After the heating element 273 is turned on for the predetermined time, the heating element 274 may be turned off, and the sensing element 274 may sense the temperature of the turned off heating element 273. The sensor PC 263 may determine whether the maximum value of the temperature difference value of the on / off state of the heat generating element 273 is equal to or less than the reference difference value.

The defrosting means 50 may be turned on by the controller 40 when the maximum value of the temperature difference value of the on / off state of the heating element 273 is equal to or less than the reference difference value. have.

In the above description, the sensor PC 263 determines whether the temperature difference value of the on / off state of the heating element 273 is equal to or less than a reference difference value. However, the control unit 40 determines that the heating element ( It may be determined whether the temperature difference value in the on / off state of 273 is equal to or less than the reference difference value, and the defrosting means 50 may be controlled according to the determination result.

1: refrigerator 11: storeroom
12: inner case 20: cold air duct
230: bypass euro 260: euro cover
261: cover plate 263: barrier
269: slot 270: sensor
273: heating element 274: sensing element

Claims (19)

An inner case forming a storage compartment;
A cold air duct which guides the flow of air in the storage compartment and forms a heat exchange space together with the inner case;
An evaporator positioned in a heat exchange space between the inner case and the cold air duct;
A bypass flow path disposed in the cold air duct and allowing air to flow by bypassing the evaporator;
A sensor disposed in the bypass flow passage, the sensor having an output value different according to a flow rate of air flowing through the bypass flow passage;
Defrosting means for removing frost generated on the surface of the evaporator; And
And a control unit for controlling the defrosting means based on an output value of the sensor. The method of claim 1,
The sensor, the heating element,
A sensing element for sensing a temperature of the heating element;
And a sensor PC, in which the heating element and the sensing element are installed. The method of claim 2,
When the difference value between the temperature sensed by the sensing element when the heating element is turned on and the temperature sensed by the sensing element when the heating element is turned off is less than or equal to a reference temperature value, the control unit operates the defrosting means. Refrigerator. The method of claim 1,
And a flow channel cover covering the bypass flow path to partition the bypass flow path from the heat exchange space. The method of claim 4, wherein
The cold air duct includes a vertical extending surface which is a surface on which the bypass flow path is formed,
The flow path cover may include a cover plate covering the bypass flow path,
And a barrier that extends from the cover plate and protrudes downward from the upper and lower extension surfaces while the cover plate covers the bypass flow path. The method of claim 5,
The bypass passage extends in a straight line in the vertical direction on the vertically extending surface. The method of claim 5,
The barrier includes a rear barrier extending continuously from the cover plate and positioned adjacent to the evaporator;
A plurality of side barriers extending at left and right positions spaced apart from the rear barriers;
And a front barrier connecting the plurality of side barriers and spaced apart from the rear barrier and positioned opposite the evaporator with respect to the rear barrier. The method of claim 7, wherein
The lower surface of the barrier is opened,
And the back barrier, the plurality of side barriers and the back barrier form a guide flow path for guiding air to the bypass flow path. The method of claim 7, wherein
The cold air duct further includes an inclined surface extending inclined at the end of the upper and lower extension surface and guides air to the evaporator side,
The rear barrier is provided with a slot for forming a passage for allowing the air flowing along the inclined surface to flow to the evaporator side. The method of claim 4, wherein
The cold air duct includes a bottom wall for forming the bypass flow passage, and both side walls,
The flow path cover includes a cover plate covering the bypass flow path in a state spaced apart from the bottom wall,
The sensor may be arranged to be spaced apart from the bottom wall and the cover plate in the bypass flow path. The method of claim 10,
The sensor is disposed to be spaced apart from the inlet and the outlet of the bypass flow path,
And a part of the sensor is located at a point that bisects the distance between the bottom wall and the cover plate in a bypass flow path. The method of claim 11,
And the sensor is located closer to an outlet than to an inlet of the bypass passage. The method of claim 4, wherein
And at least a portion of the bypass passage and the passage cover are disposed to face the evaporator within a left and right width range of the evaporator. The method of claim 4, wherein
A blowing fan is disposed inside the cold air duct,
The cold air duct is formed with a cold air inlet for introducing cold air,
The bypass passage is arranged so as not to overlap the cold air inlet hole in the vertical direction. The method of claim 14,
The outlet of the bypass passage is located in the outer region of the restricted area having a diameter larger than the blowing fan relative to the center of the blowing fan. The method of claim 15,
And the outlet of the bypass passage is located higher than the top of the evaporator. The method of claim 15,
The diameter of the said restriction | limiting area is 1.5 times or more of the diameter of the said blowing fan. The method of claim 1,
And a blocking rib formed above the bypass flow passage in the cold air duct to block liquid from flowing into the bypass flow passage. The method of claim 18,
The left and right minimum lengths of the blocking ribs are larger than the left and right minimum widths of the bypass flow path,
The entire left and right of the bypass flow passage is arranged to overlap the blocking rib in the vertical direction.

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