CN113776254B

CN113776254B - Refrigerator with defrosting function

Info

Publication number: CN113776254B
Application number: CN202111170500.6A
Authority: CN
Inventors: 王卫; 刘亚雪; 徐燃
Original assignee: Guangdong Hck Refrigeration Technology Co ltd
Current assignee: Guangdong Hck Refrigeration Technology Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2022-10-11
Anticipated expiration: 2039-12-13
Also published as: CN113776254A; CN110906604A; CN110906604B

Abstract

The invention relates to a refrigerator with a defrosting function, which comprises an evaporator, a drain pipe and a water pan, wherein the evaporator and the water pan are positioned at the upper part of a refrigerator body; the heating tube is attached to the evaporator; the defrosting control method adopted by the refrigerator fully considers the frosting severity and the factors of reliable operation of a heating device, 2 different defrosting stages are set in one defrosting period, and whether the secondary defrosting stage is started or not is determined according to the actual defrosting condition; and different defrosting power modes are adopted according to the actual frosting condition. The defrosting function is realized by reasonably setting the positions of the water receiving tray and the drain pipe, increasing the structure of the defrosting function and skillfully setting the structure of the water storage tray, and finally, the technical problems that the drain pipe is frosted and iced and cannot drain water are solved, and the better defrosting function is finally realized by reasonably judging the frosting severity, setting the defrosting power and increasing the defrosting control method at the secondary defrosting stage.

Description

Refrigerator with defrosting function

Technical Field

The invention relates to a refrigerator, in particular to a refrigerator with a defrosting function.

Background

When the ambient temperature of the refrigerator is relatively high, it is relatively difficult to cool the refrigerating chamber, resulting in an increase in the on-off ratio of the compressor. The evaporator runs at a low temperature for a long time, and is very easy to frost and freeze after contacting with water vapor in the refrigerator. In the prior art, a heating wire is arranged on an evaporator, and when the heating wire of the evaporator generates heat to evaporate water, the redundant water flows to a water pan through a drain pipe in the refrigerator. For the air-cooled refrigerator with the evaporator positioned at the upper part of the refrigerator, after defrosting, the defrosting is left in a compressor water pan through an internal pipeline.

In general, a heating wire is provided at an upper half portion of the inner drain pipe. However, when the refrigerator is in a low-temperature environment for a long time, the lower part of the drain pipe is slowly frosted and blocked, so that moisture generated by defrosting cannot be removed, and the normal use of the refrigerator is influenced.

In addition, the setting of the defrosting time or period in the prior art is often fixed. However, the temperature and humidity in the refrigerator are different, the degree of frost formation on the evaporator is also different, and the time required for defrosting is different. If the defrosting operation is performed only within a fixed time period, if the frosting is serious, the defrosting operation may be incomplete, and the normal permission of the refrigerator is further influenced. If the frosting is not serious, the temperature of the evaporator or the environment is increased, which is not beneficial to improving the refrigeration effect. At the same time, too long a time often means that the defrosting heating device may be subject to more adverse over-temperature failures. Therefore, a reasonable defrosting control method is also an urgent problem to be solved for improving the defrosting effect.

Disclosure of Invention

The invention aims to provide a refrigerator with a defrosting function, which is simple in structure, simple and convenient to install and smooth in water drainage, and aims to solve the problems in the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a refrigerator with a defrosting function comprises an evaporator, a drain pipe and a water pan, wherein the evaporator and the water pan are positioned at the upper part of a refrigerator body;

the heating tube is attached to the evaporator;

the water receiving tray is positioned below the heating pipe and the evaporator, and the bottom of the water receiving tray is provided with a water discharging pipe interface;

the drain pipe is connected with the drain pipe interface and is bent outwards to extend out of the refrigerator body after being connected.

Further, the drain pipe is bent outwards to extend out of the refrigerator body near the connection position of the drain pipe and the drain pipe connector.

Further, the heating tube is located below the evaporator.

Furthermore, a heating wire is arranged on the lower surface of the water receiving tray;

and/or the bottom of the water receiving tray is inclined and is lowest near the joint of the drain pipe.

Further, the heating wire is coated by an aluminum film.

Further, the drain pipe interface is disposed near a rear side of the refrigerator main body.

Further, the drain pipe extends out of the refrigerator body and then extends downwards to the water storage tray; the water storage tray is positioned at the lower part of the refrigerator body; the water storage tray is also provided with an evaporation pipe; the evaporating pipe is an evaporating pipe of a condenser of the refrigerator.

Further, the bent part of the drain pipe when bent outwards is arranged vertically or inclined downwards.

Further, a plurality of bulges are arranged at the bottom of the water storage disc, and the evaporation tubes are arranged on the bulges.

Furthermore, a heating wire is attached to the part of the drain pipe, which is positioned in the refrigerator main body;

and/or an outer side protection box is additionally arranged on the part of the drain pipe extending out of the refrigerator body.

Further, the refrigerator adopts the following control method to realize defrosting:

after the defrosting period is started,

the heating device works in a first power mode;

sampling the change of the temperature value of the evaporator after starting;

judging whether the change of the temperature value meets a third preset condition or not;

when the third preset condition is met, entering a primary defrosting stage, wherein the heating device adopts a first power mode; when the third preset condition is not met, the heating device adopts a second power mode;

the first power mode defines a power greater than the power defined by the second power mode;

the third preset condition is that the temperature change speed of the evaporator is less than the first reference value.

Further, when the power defined by the first power mode or the second power mode is exhausted,

finishing the primary defrosting stage;

sampling the change of the temperature value of the heating device, and judging whether the change of the temperature value meets the fourth preset condition

Conditions; if the fourth preset condition is met, entering a secondary defrosting stage after a second preset time period; if not, waiting for the next defrosting period to start; the fourth preset condition is that a change in the temperature value of the heat generating device is greater than the second reference value.

Further, after the change of the temperature value of the heating device is judged to meet the fourth preset condition, the change of the temperature value of the heating device is judged to meet the fourth preset condition

Judging whether the change of the temperature value meets a fifth preset condition or not;

the fifth preset condition is that the change of the temperature value is greater than a third reference value;

if the fifth preset condition is met, entering a second power mode after a second preset time period

A second defrosting stage; if not, entering twice according to a fourth power mode after a second preset time period

Defrosting;

the third power mode defines a power greater than the power defined by the fourth power mode.

Compared with the existing refrigerator, the refrigerator provided by the invention has the advantages that the positions of the water receiving disc and the drain pipe are reasonably arranged, the structure with the defrosting function is added, and the structure of the water storage disc is skillfully arranged, so that the technical problems that the drain pipe is frosted and frozen and cannot drain water are finally solved, and the defrosting function is realized. And finally, a better defrosting function is realized by reasonably judging the frosting severity, setting the defrosting power and increasing the defrosting control method in the secondary defrosting stage.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic view of an overall structure of a refrigerator according to the present invention.

Fig. 2 is a related partial schematic view of fig. 1.

Fig. 3 is a partial schematic view of a relevant portion of fig. 2.

Fig. 4 is a schematic view of the water storage tray of the present invention.

FIG. 5 is a flow chart of the start of the defrosting cycle of the present invention.

FIG. 6 is a flow chart of the end of the defrosting cycle of the present invention.

FIG. 7 is a flow chart of the first defrosting stage of the defrosting cycle of the present invention.

FIG. 8 is a flow chart of another first defrosting stage of the defrosting cycle of the present invention.

FIG. 9 is a flow chart of the second defrosting stage of the defrosting cycle of the present invention.

FIG. 10 is a flow chart of another second defrosting stage of the defrosting cycle of the present invention.

FIG. 11 is a flow chart of the end of the second defrosting phase of the defrosting cycle of the present invention.

In the figure: 1 fan, 2 evaporators, 3 drain pipes, 4 outer side protection boxes, 5 compressors, 6 water storage trays, 7 condensers, 8 heating pipes, 9 water receiving trays and 10 evaporation pipes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

Referring to fig. 1 to 4, a refrigerator includes: evaporator 2, condenser 7, drain pipe 3, compressor 5 and water storage tray 6. In addition, the cooling system also comprises a fan 1 for outputting the cooling capacity. The functions of the evaporator 2, the condenser 7 and the compressor are completely identical to those of the related components in the prior art refrigerator.

The evaporator 2 is located at a position close to the rear side of the upper portion of the refrigerator. As shown in fig. 2, the evaporator further comprises a heating tube 8, wherein the heating tube 8 is attached to the lower part of the evaporator 2, has a defrosting function, and ensures that the surface of the evaporator 2 is not frosted. A water receiving tray 9 is arranged below the heating pipe 8, and a water discharging pipe interface is arranged at the bottom of the water receiving tray 9. The drain pipe interface is funnel-shaped, is connected with the drain pipe 3, and finally discharges the water after defrosting through the drain pipe 3.

In a further preferred embodiment, the drain connection may be stepped. Such as steps arranged in 2, 3, or other layers. Each layer of ladder can be arranged to be a plane; or the inclined surface is arranged to incline towards the bottom of the joint of the drainage pipe.

More specifically, the lower surface of the water receiving tray 9 is also provided with a heating wire in an attaching mode, so that water in the water receiving tray is prevented from being frosted and frozen.

In a further preferred embodiment, the bottom of the drip tray 9 is inclined, being lowest near the drain pipe interface.

An aluminum film can be arranged outside the heating wire 11 for protection. Due to the coating of the aluminum film, the dustproof and moistureproof effects can be achieved.

In a further preferred embodiment, the heating wire is attached to the lower surface of the water pan 9, or even to the lower surface of the drain pipe interface of the water pan 9.

In a further preferred embodiment, the part of the drain pipe 3 inside the refrigerator body is short, i.e. the drain pipe 3 is bent outwards immediately after connecting the drain pipe interface and then extends downwards from outside the refrigerator body to the drip tray 6. Thus, the drain pipe 3 which is as short as possible can be arranged in the refrigerator, and the technical problem that water in the drain pipe is easy to frost and freeze due to low temperature in the refrigerator is reduced.

In this embodiment, the length of the drain pipe 3 may be 3-10 cm, for example, about 5 cm. Of course, other suitable lengths may be provided. The specific length is set according to the internal layout of the refrigerator and the set temperature of the refrigerator body.

Specifically, an outer protection box 4 is additionally installed on a portion of the drain pipe 3 outside the refrigerator main body to protect the drain pipe 3.

In a further preferred embodiment, the drain pipe port is provided near the rear side of the refrigerator main body, thereby making it possible to make the drain pipe 3 located in the refrigerator main body as short as possible. Because the length of the drain pipe 3 in the refrigerator main body is shortened as much as possible, the possibility that water in the drain pipe is frosted and iced due to low temperature in the refrigerator main body is reduced, and the smoothness of water drainage is ensured.

Specifically, the evaporator 2 is also disposed near the rear side of the refrigerator main body. This arrangement allows the heat generating pipe 8 and the drain pipe joint that are engaged with the evaporator 2 to be disposed as close to the rear side of the refrigerator main body as possible.

In a further preferred embodiment, the drain pipe 3 is bent 90 degrees to the outside of the refrigerator body, i.e. the bent portion is perpendicular to the refrigerator body. Or the drain pipe 3 is arranged to be inclined outwards at the bending part towards the outer side of the refrigerator main body so as to facilitate the drainage of water.

In a further preferred embodiment, the water storage tray 6 is further provided with an evaporation pipe 10, and the evaporation pipe 10 is an evaporation pipe on a condenser. Thus, the evaporation tube 10, which heats up during operation, uses the water in the water storage tray 6 to dissipate heat, and the water in the water storage tray 6 is also evaporated faster by the evaporation tube 10 to avoid overflowing.

Specifically, the bottom of the water storage tray 6 is provided with a protrusion, and the evaporation tube 10 can be placed on the protrusion. Although 2 bumps are shown in fig. 4, the number of bumps can be flexibly set.

According to the embodiment of the invention, the positions of the water receiving disc and the drain pipe are reasonably arranged, the structure with the defrosting function is added, and the structure of the water storage disc is skillfully arranged, so that the technical problems that the drain pipe is frosted and frozen and cannot drain water are finally solved, and the defrosting function is realized.

On the basis of the refrigerator with the defrosting structure, the invention also provides a defrosting control method. The defrosting control method may be applied to the refrigerator shown in the foregoing embodiment. Meanwhile, the defrosting device can also be applied to other refrigerating devices which utilize heating devices to defrost. The type of refrigeration unit or the specific mechanical configuration of the specific application is not limited in the present invention. Because the defrosting control method can be applied to any refrigerating device which has and utilizes the heating device to defrost. The specific heat generating device is not limited to the type or structure of the heat generating device referred to in the foregoing embodiments.

As mentioned in the background art, if the above heat generating device is heated only for a fixed period of time, it is easy to cause incomplete defrosting or cause inefficiency of the refrigerating apparatus.

In the first embodiment regarding the control method, the following factors are considered. The temperature change rate of the evaporator is related to the severity of frost formation when defrosting, and in the case of severe frost formation, the temperature change rate of the evaporator is related to the severity of frost formation in the early stage of the initial defrosting stage because defrosting takes a long time. The more severe the frost formation, the slower the rate of change of the evaporator temperature. Therefore, the severity of frosting can be judged by using the temperature change speed of the evaporator in the early stage of the primary defrosting stage, so that different defrosting modes, such as different defrosting powers, can be selected. Different defrosting powers can be set by selecting defrosting time and/or defrosting current. For example, different defrosting times are selected with a fixed defrosting current. Alternatively, different defrosting currents are selected with a fixed defrosting time. Or, the defrosting time and the defrosting current are simultaneously changed to set different defrosting powers. The selection of the defrosting power can be performed in a primary defrosting stage in the defrosting period, that is, after sampling the change speed of the evaporator at the early stage of the primary defrosting stage in the defrosting period and judging the severity of frosting, the remaining defrosting power of the primary defrosting stage is selected.

Referring to fig. 7, the third preset condition relates to a temperature change rate of the evaporator. Specifically, the third preset condition is that the temperature change speed of the evaporator is smaller than the first reference value. When the third preset condition is met, the heating device in the defrosting period adopts a first power mode; and when the third preset condition is not met, the heating device in the defrosting period adopts a second power mode. The first power mode defines a power greater than the power defined by the second power mode.

In a second preferred embodiment, the invention is further modified by taking into account the following factors: in the initial stage of the defrosting process, the temperature of the evaporator is changed slowly because the heating device near the evaporator just starts to work, and therefore the severity of the frosting cannot be reflected really. Therefore, the sampling time for the temperature change rate should be set as long as possible after a period of time after the start of defrosting, but the period of time and the subsequent sampling period of time are still in the defrosting early stage. However, any defrosting power setting must ensure the safe and reliable operation of the heating device. And when the defrosting power is exhausted, the defrosting stage is ended.

Referring to fig. 8, before determining whether the temperature parameter of the evaporator meets the third preset condition, a sampling step is required, and the sampling step is performed on the temperature variation value of the evaporator after the first preset time period after the start of the defrosting cycle. The sampling time after the first preset time period is still in the early stage of the primary defrosting stage.

When the first defrosting period of the restarted refrigerating device is started, the defrosting power of the primary defrosting stage of the first defrosting period or the defrosting power before the temperature sampling of the primary defrosting stage is set to be the first power mode with larger power.

In a third preferred embodiment, the invention is further modified by taking into account the following factors: after the primary defrosting stage is finished, the temperature change speed of the heating device can reflect the residual frosting amount, namely the residual frosting amount can be reflected to the end and is not removed. If the amount of remaining frost is large, the time for the heat generating device to cool down is short, that is, the temperature change speed of the heat generating device is fast. Thus, the remaining frost formation amount can be detected by the temperature change speed of the heat generating device.

Meanwhile, during the initial defrosting of each defrosting cycle, because of the protection of the heat-generating device, the defrosting power (i.e., the current and/or time for operating the heat-generating device) needs to be limited within a certain range. Otherwise, damage to the heat generating device or damage to a fuse device connected in series in the power supply circuit of the heat generating device may occur. Thereby affecting the normal use of the refrigeration unit. Therefore, if the frosting is serious, the better choice is to carry out secondary defrosting.

Therefore, whether or not the frost formation is still present and how much frost remains in the case where the frost formation is present can be determined based on the temperature change speed of the heat-generating device after the frost formation is completed. The secondary defrosting stage can adopt fixed defrosting power. The selection of the power mode of the secondary defrosting stage can also be made according to the residual frosting amount. Selecting different defrosting modes has different defrosting powers. Different defrosting powers can be set by selecting defrosting time and/or defrosting current. For example, different defrosting times are selected with a fixed defrosting current. Alternatively, different defrosting currents are selected with a fixed defrosting time. Or, the defrosting time and the defrosting current are simultaneously changed to set different defrosting powers. The second defrosting stage is executed after a reference time period. In consideration of protection of the heat-generating device, the reference time period is positively correlated with the defrosting power of the defrosting mode adopted in the primary defrosting stage, so as to ensure that the heat-generating device can obtain enough cooling time.

Referring to fig. 9, after the primary defrosting stage is finished, sampling a temperature parameter (e.g., a temperature variation value) of the heat generating device, determining whether the temperature parameter (the temperature variation value) meets a fourth preset condition, and if so, performing a secondary defrosting operation after a second preset time period; if not, waiting for the next defrost cycle to start. The fourth preset condition is that the temperature variation value of the heat generating device is greater than the second reference value.

Meanwhile, the length of the second preset time period is related to the power mode of the primary defrosting stage. If a first power mode with a relatively large value is used in the defrosting initialization phase, the second preset time period is relatively long. If a first power mode with a relatively small value is used in the defrosting initialization stage, the second preset time period is relatively short.

It is noted that the power of the second defrosting stage is often less than the power of the first defrosting stage. This is more advantageous for the protection of the heat generating device.

Referring to fig. 11, the second defrost phase ends after the power defined by its selected power mode is exhausted. And waiting for the start of the next defrosting period after finishing.

In a fourth preferred embodiment, the invention is further modified by taking into account the following factors: referring to fig. 10, a further improvement over the previous embodiment. And after the temperature parameter of the heating device is judged to meet the fourth preset condition, judging whether the temperature parameter meets the fifth preset condition again. The fifth preset condition is that the variation of the temperature parameter is larger than the third reference value. And if the fifth preset condition is met, performing secondary defrosting operation according to a third power mode after a second preset time period, and if the fifth preset condition is not met, performing secondary defrosting operation according to a fourth power mode after the second preset time period. The third power mode defines a power greater than the power defined by the fourth power mode.

The inventor states that different combinations among the above embodiments can construct different technical solutions for improving the defrosting control method, which is the same as the meaning of "further modification" in the above embodiments. Due to space limitations, they are not necessarily combined and described.

The defrosting cycle referred to in the above embodiments may be a fixed length of time or a period of time. Or an event triggered by a change in a parameter as a flag. For example, after the evaporator temperature is less than a certain threshold, a new defrost cycle is initiated. Or triggering the starting of a new defrosting period after the temperature change of the evaporator is smaller than another set threshold value. Or after the temperature of the evaporator is less than a certain set threshold value and/or the temperature change of the evaporator is less than another set threshold value, triggering the starting of a new defrosting period.

Similar measures are taken for the end of the defrost cycle. May be set to end after a fixed length of time or period of time after the defrost cycle is initiated. Or an event triggered by a change in a parameter as a marker. For example, the defrost cycle is ended after the temperature of the evaporator exceeds a certain reference threshold. Or ending the defrosting cycle after the temperature change of the evaporator is greater than another reference threshold. The defrost cycle is ended either after the temperature of the evaporator exceeds a certain reference threshold and/or after the temperature change of the evaporator is greater than another reference threshold.

Referring to fig. 5-6, an example is given of the initiation and termination of a defrost cycle as a function of parameter variation. The defrosting cycle is started or ended according to a first preset condition and a second preset condition. For example, the temperature value of the evaporator is used as the variable condition of the first preset condition and the second preset condition. And when the temperature value of the evaporator is smaller than the fourth reference value, the first preset condition is met. And when the temperature of the evaporator is greater than the fifth reference value, a second preset condition is met.

Regarding the problem of sampling and calculating the temperature variation value, various means common in the art may be employed. Such as a temperature difference or an average of differences over a period of time; or by differential calculation. Or calculating the time from the first temperature to the second temperature to react, wherein the longer time indicates slow change, and the shorter time indicates fast change. And the temperature change values all refer to absolute values thereof.

All power modes need to take into account the need for safe and reliable operation of the heat generating device.

The embodiment of the defrosting control method of the invention finally realizes a better defrosting function by reasonably judging the frosting severity, setting the defrosting power and increasing the secondary defrosting stage.

Claims

1. A refrigerator with a defrosting function comprises an evaporator (2), a drain pipe (3) and a water pan (9), wherein the evaporator (2) and the water pan (9) are positioned at the upper part of a refrigerator body; the method is characterized in that:

the evaporator also comprises a heating device which is arranged near the evaporator (2);

the water receiving tray (9) is positioned below the heating device and the evaporator (2), and the bottom of the water receiving tray is provided with a water discharge pipe interface;

the drain pipe (3) is connected with the drain pipe interface, and after connection, the drain pipe is bent outwards and extends out of the refrigerator body;

the drain pipe (3) extends out of the refrigerator body and then extends downwards to the water storage disc (6); the water storage tray (6) is positioned at the lower part of the refrigerator body; the water storage plate (6) is also provided with an evaporation pipe (10); the evaporation tube (10) is an evaporation tube of a condenser of the refrigerator;

the refrigerator adopts the following control method to realize defrosting:

when the defrosting period is started,

the heating device works in a first power mode;

sampling the change of the temperature value of the evaporator (2) after starting;

the third preset condition is that the change of the temperature value of the evaporator (2) is less than the first reference value;

the first defrosting stage is finished when the power defined by the first power mode or the second power mode is exhausted;

sampling the change of the temperature value of the heating device, and judging whether the change of the temperature value meets a fourth preset condition or not; if the fourth preset condition is met, entering a secondary defrosting stage after a second preset time period; if not, waiting for the next defrosting period to start; the fourth preset condition is that a change in the temperature value of the heat generating device is larger than the second reference value.

2. The refrigerator with defrosting function according to claim 1, characterized in that:

the length of the second preset time period is positively correlated with the power adopted by the heating device in the primary defrosting stage.

3. The refrigerator with defrosting function according to claim 1, characterized in that: the drain pipe (3) is bent outwards to extend out of the refrigerator body near the connection position of the drain pipe interface.

4. The refrigerator with defrosting function according to claim 1, characterized in that: the heating device is positioned below the evaporator (2).

5. The refrigerator having a defrosting function according to claim 1, wherein: a heating wire is arranged on the lower surface of the water receiving tray (9);

and/or the bottom of the water receiving tray (9) is inclined and is lowest near the drain pipe interface.

6. The refrigerator having a defrosting function according to claim 1, wherein: the drain pipe (3) extends out of the refrigerator body and then extends downwards to the water storage disc (6); the water storage tray (6) is positioned at the lower part of the refrigerator body; the water storage plate (6) is also provided with an evaporation pipe (10); the evaporation tube (10) is an evaporation tube of a condenser of the refrigerator.

7. The refrigerator having a defrosting function according to claim 5, wherein: the water outlet pipe interface is arranged close to the rear side of the refrigerator main body.

8. The refrigerator with a defrosting function according to any one of claims 1 to 7, wherein:

and the secondary defrosting stage adopts fixed defrosting power.

9. The refrigerator with a defrosting function according to claim 8, wherein:

the fixed defrosting power is less than the power adopted by the heating device in the primary defrosting stage.

10. The refrigerator with a defrosting function according to any one of claims 1 to 7, wherein:

triggering a new defrosting cycle to start when the temperature of the evaporator (2) is less than a fourth reference value;

the defrosting cycle is ended when the temperature of the evaporator (2) is greater than a fifth reference value.