Refrigerator, defrosting control method and defrosting control device

Abstract

The invention relates to the technical field of refrigeration, and discloses a refrigerator which comprises a refrigerating system, a refrigerating system, a refrigerating system, a refrigerating system and a refrigerating system, the refrigerating system adopts mixed refrigerants, and the mixed refrigerants comprise at least one of R600a and R600 and R290; fins are arranged on the surface of the evaporator; the first defrosting heating pipes are arranged on fins on the two opposite sides of the evaporator; and the second defrosting heating pipe is arranged on the side wall, corresponding to the air return port of the compressor bin, of the evaporator. The mixed refrigerant is adopted to guarantee the temperature of the cryogenic space, meanwhile, the defrosting heating pipe structure is used for assisting the evaporator in defrosting, and the problem that defrosting is not thorough is solved. The invention further discloses a defrosting control method and a defrosting control device.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a freezer, a defrost control method and a defrost control device. Background Art

[0002] As people's living standards improve, users have higher and higher requirements for the quality of frozen food preservation. For freezers, as users' requirements for refrigeration depth continue to increase, the evaporator is in an ultra-low temperature working state, resulting in serious incomplete defrosting and even long-term frost in some parts.

[0003] However, existing refrigerators generally use a defrost heating tube arranged outside the evaporator for heating and defrosting. This heating method has the problem of incomplete defrosting and insufficient local defrosting. The production cost and user cost of setting multiple heating tubes are increased.

[0004] Therefore, how to completely defrost the evaporator of a deep freezer while saving energy and cost is a problem that needs to be solved urgently in the art.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a refrigerator, a defrost control method and a defrost control device to solve the problem of incomplete defrosting of the evaporator while using mixed refrigerant refrigeration to ensure the temperature of a deep cold space.

[0008] According to an embodiment of the first aspect of the present invention, a refrigerator is provided, including: a refrigeration system, using a mixed refrigerant, the mixed refrigerant including one of R600a, R600 and R290; an evaporator, the surface of which is provided with fins; a first defrost heating tube, arranged on the fins on opposite sides of the evaporator; a second defrost heating tube, arranged on the side wall of the evaporator corresponding to the return air outlet of the compressor compartment.

[0009] In some embodiments, the upper and lower surfaces of the evaporator are both provided with insulation covers; a first defrost heating tube distributed in a serpentine shape is provided between the insulation cover and the upper surface and between the insulation cover and the lower surface; the second defrost heating tube is distributed in a serpentine shape on the side wall of the evaporator.

[0010] In some embodiments, the refrigerator also includes a first sensor, which is located at the lowest temperature point of the fins covered by the upper and lower insulation covers of the evaporator; the second sensor is located at the lowest temperature point on the side of the evaporator; the first sensor is located at the lowest temperature point of the fins covered by the upper and lower insulation covers of the evaporator; the second sensor is located at the lowest temperature point on the side of the evaporator.

[0011] In some embodiments, the refrigerator further includes a frost containing structure including a groove, and the inner wall of the thermal insulation cover plate disposed on the top of the evaporator protrudes outward to increase the space between the thermal insulation cover plate and the evaporator fins.

[0012] In some embodiments, the refrigerator further includes a bypass air path disposed between the evaporation pipes.

[0013] In some embodiments, the refrigerator comprises a refrigeration system and a cabinet body. The refrigeration system comprises a compressor, an evaporator and a condenser in sequence through pipelines.

[0014] In some embodiments, the relationship between the mass ratio of R290 in the mixed refrigerant and the volume of the cryogenic space includes:

[0015] W=1-[k1*V 2 -k2*V+k3]; (1)

[0016] Among them, W is the mass proportion of R290; V is the volume of the deep cold space; the value range of k1 is 0.000007-0.000009; the value range of k2 is 0.003-0.004; when the mixed refrigerant is a mixture of R600 and R290, the corresponding value range of k3 is 0.9~1; when the mixed refrigerant is a mixture of R600a and R290, the corresponding value range of k3 is 1~1.1.

[0017] According to an embodiment of the second aspect of the present invention, a defrost control method is provided, comprising: obtaining frosting conditions on the evaporator surface; and controlling a first defrost heating tube and a second defrost heating tube to start defrosting according to the frosting conditions on the evaporator surface.

[0018] In some embodiments, the refrigerator includes a first sensor and a second sensor, and obtaining the frosting condition on the surface of the evaporator includes: obtaining a first temperature value detected by the first sensor and a second temperature value detected by the second sensor.

[0019] In some embodiments, controlling the first defrost heating tube and the second defrost heating tube to start defrosting according to the frosting condition on the evaporator surface includes:

[0020] When the first temperature value is less than the preset temperature value, the compressor is controlled to stop and the first defrost heating tube is controlled to start defrosting; when the first temperature value is greater than the preset temperature value, or the first defrost heating tube starts defrosting and the defrost time is greater than the first preset time, the first defrost heating tube is controlled to be in a closed state; after the first defrost heating tube stops defrosting and the second temperature value is less than the preset temperature value, the second defrost heating tube is controlled to start defrosting.

[0021] In some embodiments, obtaining the frosting condition of the evaporator surface includes: obtaining the ratio of the mixed refrigerant components; determining the estimated frosting duration according to the ratio of the mixed refrigerant components;

[0022] Controlling the first defrost heating tube and the second defrost heating tube to start defrosting according to the frosting condition on the surface of the evaporator includes: controlling the first defrost heating tube and the second defrost heating tube to start defrosting when the operation time of the refrigerator is not less than the estimated frosting time.

[0023] In some embodiments, the preset temperature value is 0°C to 5°C, wherein preferred preset temperature values ​​include: 0°C, 1°C, 2°C, 3°C, 4°C, and 5°C.

[0024] According to an embodiment of the third aspect of the present invention, a defrost control device is provided, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute a defrost control method as described in any one of the above embodiments when running the program instructions.

[0025] The refrigerator provided in the embodiments of the present disclosure can achieve the following technical effects:

[0026] By using a mixed refrigerant to ensure the temperature of the deep cold space and using a defrost heating tube structure to assist the evaporator in defrosting, the problem of incomplete defrosting is avoided. The application also discloses a defrost control method and a defrost control device.

[0027] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0029] Figure 1 is an explosion schematic diagram of an evaporator provided by an embodiment of the present disclosure;

[0030] Figure 2 is a structural schematic diagram of an evaporator provided by an embodiment of the present disclosure;

[0031] Figure 3 is a schematic structural diagram of a thermal insulation cover plate provided by an embodiment of the present disclosure;

[0032] Figure 4 is a partial structural schematic diagram of a refrigerator provided by another embodiment of the present disclosure;

[0033] Figure 5 is a schematic diagram of the structure of a refrigeration system provided by an embodiment of the present disclosure;

[0034] Figure 6 is a flow chart of a defrost control method provided by an embodiment of the present disclosure;

[0035] Figure 7 is a flow chart of a defrost control method provided by another embodiment of the present disclosure;

[0036] Figure 8 is a flow chart of a defrost control method provided by yet another embodiment of the present disclosure;

[0037] Fig. 9 is a flow chart of a defrost control method provided by yet another embodiment of the present disclosure;

[0038] Fig.10 A structural schematic diagram of a defrost control device provided by a disclosed embodiment.

[0039] Reference numerals:

[0040] 1: Refrigeration system;

[0041] 10: compressor;

[0042] 20: Freezer; 21: Deep cold space; 22: Variable temperature space;

[0043] 30: evaporator; 301: fin;

[0044] 40: First defrost heating pipe; 41: Second defrost heating pipe; 42: Compressor compartment return air outlet; 43: Insulation cover;

[0045] 50: first sensor; 51: second sensor; 52: frost containment structure; 53: bypass air passage;

[0046] 1000: processor; 1001: memory; 1002: bus; 1003: communication interface. DETAILED DESCRIPTION

[0047] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0048] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0050] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0051] Unless otherwise stated, the term "plurality" means two or more.

[0052] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0053] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0054] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0055] As people's living standards improve, users have higher and higher requirements for the quality of frozen food preservation. For freezers, as users' requirements for refrigeration depth continue to increase, the evaporator is in an ultra-low temperature working state, resulting in serious incomplete defrosting and even long-term frost in some parts.

[0056] However, existing refrigerators generally use a defrost heating tube arranged outside the evaporator for heating and defrosting. This heating method has the problem of incomplete defrosting and insufficient local defrosting. The production cost and user cost of setting multiple heating tubes are increased.

[0057] Therefore, how to completely defrost the evaporator of a deep freezer while saving energy and cost is a problem that needs to be solved urgently in the art.

[0058] Combination Figures 1 to 9 As shown, the embodiment of the present disclosure provides a refrigerator 20, including: a refrigeration system 1, using a mixed refrigerant, the mixed refrigerant including at least one of R600a, R600 and R290; an evaporator 30, a surface of which is provided with fins 301; a first defrost heating tube 40, arranged on the fins 301 on opposite sides of the evaporator 30; a second defrost heating tube 41, arranged on the side wall of the evaporator 30 corresponding to the compressor compartment return air outlet 42.

[0059] like Figure 1 and Figure 5As shown, the freezer 20 is provided with a deep-freezing zone, and the deep-freezing zone adopts a mixed refrigerant to reduce the refrigeration temperature. The mixed refrigerant includes one of R600a, R600 and R290. For example, the mixed refrigerant can be composed of R600a and R290, or it can be composed of R600 and R290. The cabinet body defines a refrigeration space, and the refrigeration space includes a deep-freezing space 21 with a volume of V. The temperature adjustment range of the deep-freezing space 21 is -28°C to 40°C, for example, -28°C, -35°C or -40°C, covering the functions of ordinary freezing and deep freezing, and meeting the needs of users. The mass proportion of various single-refrigerants (R600a, R600 or R290) in the mixed refrigerant affects the temperature pulling depth of the mixed refrigerant. The deep-freezing space 21 is the space with the lowest temperature required in the refrigeration space, and it is the space with the largest cooling demand in the refrigeration space. To avoid severe frost on the surface of the evaporator 30, an insulation cover 43 is provided on the upper and lower surfaces of the evaporator 30, and a first defrost heating tube 40 is provided between the insulation cover and the fins 301 of the evaporator 30. The first defrost heating tube 40 is used to start defrosting on the upper and lower surfaces of the evaporator 30; the deep cold zone refrigeration generates cold energy through the evaporator 30, and the cold energy is sent into the deep cold space 21 through the fan. The evaporator 30 corresponds to the return air outlet position. In order to avoid incomplete local defrosting of the evaporator 30, a second defrost heating tube 41 is provided on the side wall of the evaporator 30 corresponding to the return air outlet. The temperature is detected by a sensor. When the frosting temperature of the evaporator 30 is sensed to drop to a preset temperature, the first defrost heating tube 40 and the second defrost deheating tube are turned on to start defrosting.

[0060] Optionally, an insulation cover 43 is provided on the upper surface and the lower surface of the evaporator 30; a first defrost heating tube 40 distributed in a serpentine shape is provided between the insulation cover 43 and the upper surface and between the insulation cover 43 and the lower surface; and a second defrost heating tube 41 is distributed in a serpentine shape on the side wall of the evaporator 30.

[0061] like Figure 1 As shown, the first defrost heating pipe 40 and the second defrost heating pipe 41 are heated independently of each other, the first defrost heating pipe 40 is arranged on the upper and lower surfaces of the evaporator 30, and the second defrost heating pipe 41 is arranged on the side of the evaporator 30. The first defrost heating pipe is the main defrost heating pipe, and the second defrost heating pipe 41 is the auxiliary defrost heating pipe. The first defrost heating pipe 40 and the second defrost heating pipe are controlled to defrost the evaporator 30 respectively.

[0062] Optionally, the refrigerator 20 further includes: a first sensor 50 , which is disposed at the lowest temperature point of the fins 301 covered by the upper and lower insulation covers 43 of the evaporator 30 ; and a second sensor 51 , which is disposed at the lowest temperature point on the side of the evaporator 30 .

[0063] like Figure 1 and Figure 4As shown, the first sensor 50 detects the lowest temperature of the upper and lower surfaces of the evaporator 30. Since the temperature is lowest at the return air outlet of the compressor compartment, the first sensor is arranged on the inner wall of the upper insulation cover plate and adjacent to the return air outlet of the compressor compartment of the refrigerator to determine whether the evaporator 30 as a whole needs to be defrosted; the second sensor 51 is arranged at the return air outlet corresponding to the side wall of the evaporator 30 to detect the lowest temperature of the side wall to determine whether the evaporator 30 needs to be defrosted locally.

[0064] Optionally, the refrigerator 20 further includes: a frost containing structure 52 , wherein the inner wall of the heat preservation cover 43 disposed on the top of the evaporator 30 protrudes outwardly to increase the space between the heat preservation cover 43 and the fins 301 of the evaporator 30 .

[0065] like Figure 1 and Figure 3 As shown, the heat preservation cover plate 43 above the evaporator 30 is provided with a groove on the plate surface corresponding to the upper surface of the evaporator 30, and the groove runs from one end of the evaporator 30 to the other end of the evaporator 30, playing a certain role in frost containment.

[0066] Optionally, the refrigerator 20 further includes: a bypass air passage 53, which is arranged between the evaporation pipes.

[0067] like Figure 2 As shown, a bypass return air path is added on the basis of the original return air path, thereby increasing the air volume entering the evaporator 30 and improving the refrigeration effect.

[0068] It can be understood that in this embodiment, the number of the bypass air passages 53 may be one or more, and the multiple bypass air passages 53 are arranged between the fins 301 of the evaporator 30 to increase the air volume flowing into the evaporator 30 .

[0069] Optionally, combined Figure 4 and Figure 5 As shown, the refrigerator 20 comprises a refrigeration system 1 and a cabinet body. The refrigeration system 1 comprises a compressor 10, an evaporator 30 and a condenser in sequence through pipelines.

[0070] Optionally, the relationship between the mass ratio of R290 in the mixed refrigerant and the volume of the cryogenic space 22 includes:

[0071] W=1-[k1*V 2 -k2*V+k3]; (1)

[0072] Among them, W is the mass proportion of R290; V is the volume of deep cold space 22; k1 and k2 are both constants, and the value range of k1 is 0.000007-0.000009; the value range of k2 is 0.003-0.004; when the mixed refrigerant is a mixture of R600 and R290, the corresponding value range of k3 is 0.9~1; when the mixed refrigerant is a mixture of R600a and R290, the corresponding value range of k3 is 1~1.1.

[0073] It should be noted that the unit of the volume V of the cryogenic space 21 in the above formula (1) is L, and only the value of the volume V when L is used as the unit is used in the calculation.

[0074] From the above formula (1), it can be seen that when the mixed refrigerant is composed of R600a and R290, the mass proportion of R600a is (k1*V 2 -k2*V+k3), which is a parabola opening upward.

[0075] In this way, as the volume V of the deep cold space 21 increases, the mass proportion of R600a first decreases and then increases, and the refrigeration proportion of R290 first increases and then decreases.

[0076] Compared with R600a, R290 is more helpful to achieve the low temperature of the deep cold space 21, and the larger the volume V of the deep cold space 21, the greater the cold capacity required by the deep cold space 21, so the mass proportion of R290 increases first. Since the exhaust pressure of the compressor 10 is large when the refrigeration system 1 adopts R290, therefore, as the mass proportion of R290 increases, the exhaust pressure required by the compressor 10 becomes larger and larger, which will cause the compressor 10 to be unable to meet the needs, and when the mass proportion of R290 increases to a certain extent, adding R290 will not have much effect on reducing the temperature of the deep cold space 21. Therefore, the mass proportion of R290 will not be controlled to increase all the time. After increasing to a certain extent, the mass proportion of R290 is controlled to start to decrease, and finally it can meet the low temperature required by the deep cold space 21 and protect the compressor 10 to avoid damage to the compressor 10.

[0077] Similarly, from the above formula (1), when the mixed refrigerant is composed of R600 and R290, the mass proportion of R600 is (k1*V 2 -k2*V+k3), which is a parabola opening upward.

[0078] In this way, as the volume V of the deep cold space 21 increases, the mass proportion of R600 first decreases and then increases, and the refrigeration proportion of R290 first increases and then decreases.

[0079] Compared with R600, R290 is more helpful to achieve the low temperature of the deep cold space 21, and the larger the volume V of the deep cold space 21, the greater the cold capacity required by the deep cold space 21, so the mass proportion of R290 increases first. Since the exhaust pressure of the compressor 10 is large when the refrigeration system 1 adopts R290, as the mass proportion of R290 increases, the exhaust pressure required by the compressor 10 becomes larger and larger, which will cause the compressor 10 to fail to meet the demand. Therefore, the mass proportion of R290 will not be controlled to increase all the time. After increasing to a certain extent, the mass proportion of R290 is controlled to begin to decrease, and finally reach a low temperature that can meet the low temperature required by the deep cold space 21 and protect the compressor 10 to avoid damage to the compressor 10.

[0080] Similarly, from the above formula (1), when the mixed refrigerant is composed of R600a, R600 and R290, the total mass proportion of R600a and R600 is (k1*V 2 -k2*V+k3), which is a parabola opening upward, and ultimately reaches a low temperature that can meet the low temperature required by the deep cold space 21 and protect the compressor 10 to avoid damage to the compressor 10.

[0081] Compared with R600a, R600 has the characteristics of small refrigeration capacity and low exhaust pressure of the compressor 10, that is, R600 has lower performance requirements for the compressor 10. Therefore, when the volume V of the refrigeration space is constant, more R290 can be allowed to exist in the mixed refrigerant of R600 and R290, that is, the refrigeration proportion of R290 can be larger, so k3 is small.

[0082] Table 1 below shows the relationship between the volume of the cryogenic space 21, the total volume of the refrigeration space, the mass proportion of R600, the mass proportion of R290, the cooling capacity W, the casing temperature of the compressor 10, the exhaust temperature of the compressor 10, the exhaust pressure of the compressor 10, the suction pressure of the compressor 10, the cooling depth of the cryogenic space 21, the cooling depth of the variable temperature space 22, power consumption and noise.

[0083] Table 1

[0084]

[0085] It can be seen that when the volume of the refrigeration space is 150L, ​​the comprehensive indicators of power consumption, noise, and refrigeration depth of the deep refrigeration space 21 are optimal when the mass proportions of R600a and R290 are 70% and 30% respectively. This is consistent with the result calculated by the above formula (1).

[0086] When the volume of the refrigeration space is 198L, and the mass proportions of R600a and R290 are 65% and 35% respectively, the comprehensive indexes of power consumption, noise, and refrigeration depth of the deep refrigeration space 21 are optimal. This is consistent with the result calculated by the above formula (1).

[0087] Table 2 below shows the relationship between the volume of the cryogenic space 21, the total volume of the refrigeration space, the mass proportion of R600, the mass proportion of R290, the cooling capacity W, the casing temperature of the compressor 10, the exhaust temperature of the compressor 10, the exhaust pressure of the compressor 10, the suction pressure of the compressor 10, the cooling depth of the cryogenic space 21, the cooling depth of the variable temperature space 22, power consumption and noise.

[0088] Table 2

[0089]

[0090]

[0091] It can be seen that when the volume of the refrigeration space is 150L, ​​the comprehensive indicators of power consumption, noise, and refrigeration depth of the deep cold space 21 are optimal when the mass proportions of R600 and R290 are 60% and 40% respectively. This is consistent with the result calculated by the above formula (1).

[0092] When the volume of the refrigeration space is 198L, and the mass proportions of R600 and R290 are 55% and 45% respectively, the comprehensive indexes of power consumption, noise, and refrigeration depth of the deep refrigeration space 21 are optimal. This is consistent with the result calculated by the above formula (1).

[0093] Combination Figures 1 to 9 The present disclosure provides a defrost control method for a refrigerator as in any one of the above embodiments. The control method includes:

[0094] S601, obtaining the frosting condition of the evaporator surface.

[0095] S602, controlling the first defrost heating tube 40 and the second defrost heating tube 41 to start defrosting according to the frosting condition on the evaporator surface.

[0096] Combination Figure 1 and 6As shown, the refrigerator includes a first sensor, which is located at the lowest temperature of the fins covered by the upper and lower insulation covers of the evaporator; and a second sensor, which is located at the lowest temperature on the side of the evaporator. The first sensor detects the lowest temperature of the upper and lower surfaces of the evaporator. Since the temperature at the return air outlet of the compressor compartment is the lowest, the first sensor is set on the inner wall of the upper insulation cover and adjacent to the return air outlet of the compressor compartment of the refrigerator to determine whether the evaporator as a whole needs to be defrosted; the second sensor is set at the return air outlet corresponding to the side wall of the evaporator to detect the lowest temperature of the side wall to determine whether the evaporator needs to be defrosted locally. The frosting condition on the evaporator surface is obtained by detecting the temperature through the sensor.

[0097] The defrost control method provided in this embodiment first obtains the frosting condition of the evaporator surface, wherein the surface frosting condition is reflected by the evaporator surface temperature in this embodiment. The evaporator surface temperature is detected by a sensor to determine the frosting condition of the evaporator surface. When the temperature of the evaporator surface is reduced to meet the defrosting conditions due to severe frosting, the first defrost heating tube and the second defrost deheating tube are started to heat and defrost. According to the different frosting conditions reflected by the sensor, the first defrost heating tube and the second defrost heating tube are controlled to start defrosting in different ways.

[0098] In some embodiments, the frosting condition on the evaporator surface can also be obtained by other means, for example, by detecting the thickness of the frost layer and using the thickness of the frost layer to reflect the frosting condition; or by using the frost layer coverage area to determine that the defrosting requirements are met when the frost layer coverage area is not less than a preset area.

[0099] Optionally, the refrigerator includes a first sensor and a second sensor, and obtaining the frosting condition on the surface of the evaporator includes: obtaining a temperature value detected by the first sensor and a temperature value detected by the second sensor.

[0100] Combination Figure 7 As shown, an embodiment of the present disclosure provides a defrost control method, which is used in a refrigerator as in any one of the above embodiments, and the control method includes:

[0101] S701, obtaining a temperature value detected by a first sensor and a temperature value detected by a second sensor.

[0102] S702, controlling the first defrost heating tube and the second defrost heating tube to start defrosting according to the first temperature value detected by the first sensor and the second temperature value detected by the second sensor.

[0103] Combination Figure 1As shown, in this embodiment, the first defrost heating tube is arranged on the fins on opposite sides of the evaporator; the second defrost heating tube is arranged on the side wall of the evaporator corresponding to the return air outlet of the compressor compartment. The first sensor detects the temperature at the first defrost heating tube, and the second sensor detects the temperature at the second defrost heating tube. The controller controls the first defrost heating tube to start or stop according to the first temperature value, and controls the second defrost heating tube to start or stop according to the second temperature value.

[0104] Optionally, the first defrost heating tube and the second defrost heating tube are controlled to start defrosting according to the frosting condition on the evaporator surface, including: controlling the compressor to stop and controlling the first defrost heating tube to start defrosting when the first temperature value is less than the preset temperature value; controlling the first defrost heating tube to stop defrosting when the first temperature value is greater than the preset temperature value, or the defrost time of the first defrost heating tube is greater than the preset time; controlling the second defrost heating tube to start defrosting when the first defrost heating tube stops defrosting and the second temperature value is less than the preset temperature value.

[0105] Combination Figure 8 As shown, an embodiment of the present disclosure provides a defrost control method, which is used in a refrigerator as in any one of the above embodiments, and the control method includes:

[0106] S801, obtaining a first temperature value detected by a first sensor and a second temperature value detected by a second sensor.

[0107] S8021, when the first temperature value is lower than the preset temperature value, the compressor is controlled to stop and the first defrost heating tube is controlled to start defrosting.

[0108] S8022, when the first temperature value is greater than the preset temperature value, or the first defrost heating tube starts defrosting and the defrost time is greater than the first preset time, control the first defrost heating tube to be in a closed state.

[0109] S80221, after the first defrost heating tube stops defrosting and when the second temperature value is less than the preset temperature value, control the second defrost heating tube to start defrosting.

[0110] In this embodiment, the first temperature value and the second temperature value are obtained respectively. The first temperature value reflects the lowest temperature of the upper and lower surfaces of the sensor, and the second temperature value reflects the lowest temperature of the side of the sensor. When the first temperature value is less than the preset temperature value, it means that the upper and lower surfaces of the evaporator meet the requirements for starting defrosting. At this time, the compressor is stopped to avoid continued frost, and the first defrost heating tube is started to start defrosting the upper and lower surfaces of the evaporator. When the first temperature value is greater than the preset temperature value, it means that the upper and lower surfaces of the evaporator have high temperatures, the amount of frost is small, and the defrosting requirements are not met; or the first defrost heating tube starts defrosting and the defrosting time is longer than the first preset time. At this time, the compressor stops, the evaporator stops frosting, and the first defrost heating tube starts defrosting and the time is longer than the first preset time. At this time, the evaporator is defrosted for a long time by the first defrost heating tube, and the amount of frost is greatly reduced. The first defrost heating tube is controlled to be in a closed state to avoid waste of resources. After the first defrost heating tube stops defrosting, the amount of frost on the evaporator body is greatly reduced. At this time, the second temperature value is still lower than the preset temperature value, indicating that there is still a large amount of frost layer locally. At this time, the second defrost heating tube is started to perform local defrosting on the side wall of the return air outlet of the evaporator where frost is most likely to form, so as to thoroughly defrost and save resources.

[0111] Optionally, obtaining the frosting condition on the evaporator surface includes: obtaining the ratio of mixed refrigerant components; determining an estimated frosting duration based on the ratio of mixed refrigerant components; controlling the first defrost heating tube and the second defrost heating tube to start defrosting based on the frosting condition on the evaporator surface includes: controlling the first defrost heating tube and the second defrost heating tube to start defrosting when the operating time of the refrigerator is not less than the estimated frosting duration.

[0112] Combination Fig. 9 As shown, an embodiment of the present disclosure provides a defrost control method, which is used in a refrigerator as in any one of the above embodiments, and the control method includes:

[0113] S901, obtaining the mixed refrigerant ratio.

[0114] Combination Fig. 9 As shown, compared with R600a and R600, R290 is more helpful in achieving low temperatures in deep cold spaces. Therefore, in a mixed refrigerant in which R290 accounts for a relatively large proportion, the achievable temperature is lower and frost forms faster. Therefore, the composition ratio of the mixed refrigerant is determined first.

[0115] S902: Determine an estimated frosting duration according to the ratio of the mixed refrigerant.

[0116] In some embodiments, the mixed refrigerant includes R600a and R290, and the mass proportions of R600a and R290 are 65% and 35% respectively, or the mass proportions of R600a and R290 are 80% and 20% respectively, or the mass proportions of R600a and R290 are 60% and 40% respectively, and the frosting time is controlled to include 30 minutes to 180 minutes; preferably 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes and 180 minutes.

[0117] In some embodiments, the mixed refrigerant includes R600 and R290, and the mass proportions of R600 and R290 are 55% and 45% respectively, or the mass proportions of R600 and R290 are 80% and 20% respectively, or the mass proportions of R600 and R290 are 50% and 50% respectively, or the mass proportions of R600 and R290 are 70% and 30% respectively, and the frosting time is controlled to include 30 minutes to 180 minutes; preferably 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes and 180 minutes.

[0118] In some embodiments, when the mixed refrigerant includes R600 and R290, and the mass proportions of R600 and R290 are 60% and 40% respectively, the frosting time is controlled to include 120 minutes to 300 minutes; preferably 120 minutes, 180 minutes, 240 minutes and 300 minutes.

[0119] In some embodiments, when the mixed refrigerant includes R600a and R290, and the mass proportions of R600a and R290 are 100% and 0% respectively, or the mass proportions of R600a and R290 are 70% and 30% respectively, the frosting time is controlled to include 120 minutes to 300 minutes; preferably 120 minutes, 180 minutes, 240 minutes and 300 minutes.

[0120] S903, when the operating time of the refrigerator is not less than the estimated frosting time, control the first defrost heating pipe and the second defrost heating pipe to start defrosting.

[0121] The estimated frosting time is determined according to the composition ratio of the mixed refrigerant. If the compressor operation time exceeds the frosting time, it is determined that the frost amount of the evaporator meets the defrosting requirements, and the first defrost heating tube and the second defrost heating tube are controlled to be turned on for defrosting.

[0122] In some embodiments, the defrost control method includes: when the compressor operating time is not less than the estimated frost time, controlling the compressor to stop and controlling the first defrost heating tube to start defrosting; when the defrost time of the first defrost heating tube is greater than a first preset time, controlling the first defrost heating tube to be in a closed state; and controlling the second defrost heating tube to start defrosting after the first defrost heating tube stops defrosting.

[0123] In some embodiments, the refrigerator 20 includes a first sensor 50 and a second sensor 51, and uses a mixed refrigerant. The defrost control method includes: obtaining the mixed refrigerant ratio, and simultaneously obtaining the first temperature value detected by the first sensor and the second temperature value detected by the second sensor; determining the estimated frosting time according to the component ratio of the mixed refrigerant; controlling the first defrosting heating pipe to be turned on when the compressor operation time exceeds the frosting time; controlling the first defrosting heating pipe to be in a closed state when the defrosting time of the first defrosting heating pipe is greater than the first preset time, or the first temperature value is greater than the preset temperature value; controlling the second defrosting heating pipe to start defrosting after the first defrosting heating pipe stops defrosting and the second temperature value is less than the preset temperature value.

[0124] Optionally, the preset temperature value is 0°C to 5°C, wherein preferred preset temperature values ​​include: 0°C, 1°C, 2°C, 3°C, 4°C, and 5°C.

[0125] The preset temperature value is set at 0℃ to 5℃, and frosting can be detected at the first time. When the temperature drops below 0℃, frost will occur on the surface of the evaporator. When the evaporator is above 5℃, frost will not form immediately even if the temperature drops. Therefore, the preset temperature is set at 0℃ to 5℃, which can identify the frosting situation at the first time and will not make the frosting time too long. In step S8022, when the first temperature value is greater than the preset temperature value, or the defrosting time of the first defrosting heating tube is greater than the preset time, the first defrosting heating tube is controlled to stop defrosting, including when the first temperature value is greater than 0℃ or the first temperature value is greater than 5℃, the first defrosting heating tube is controlled to stop defrosting.

[0126] Combination Fig.10 As shown, an embodiment of the present disclosure provides a defrost control device, including a processor (processor) 1000 and a memory (memory) 1001 storing program instructions. The processor 1000 is configured to execute a defrost control method as any one of the above embodiments when running the program instructions.

[0127] Optionally, the defrost control device may further include a communication interface 1003 and a bus 1002. The processor 1000, the communication interface 1003, and the memory 1001 may communicate with each other through the bus. The communication interface 1003 may be used for information transmission. The processor 1000 may call the logic instructions in the memory 1001 to execute the method for controlling the refrigerator of the above embodiment.

[0128] In addition, the logic instructions in the above-mentioned memory 1001 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0129] The memory 1001, as a storage medium, can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 1000 executes the function application and data processing by running the program instructions / modules stored in the memory 1001, that is, the defrost control method in the above embodiment is implemented.

[0130] The memory 1001 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function. The data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 1001 may include a high-speed random access memory 1001 and may also include a non-volatile memory 1001.

[0131] The embodiments of the present disclosure provide a refrigeration device, including a defrost control device as in any of the above embodiments. The defrost control device is installed in the refrigeration device. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. It can be understood by those skilled in the art that the device for controlling the air-conditioning system can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0132] An embodiment of the present disclosure provides a storage medium storing computer executable instructions, wherein the computer executable instructions are configured to execute the above method for controlling a refrigerator.

[0133] The above-mentioned storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0134] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory) 1001, a random access memory (RAM, Random Access Memory) 1001, a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0135] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0136] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0137] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0138] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A refrigerator, characterized in that: include: The refrigeration system uses a mixed refrigerant, which includes one of R600a, R600 and R290; An evaporator (30) having fins (301) disposed on its surface; A first defrosting heating tube (40) is arranged on the fins (301) on two opposite sides of the evaporator (30); The second defrosting heating tube (41) is arranged on the side wall of the evaporator (30) corresponding to the compressor chamber return air port (42).

2. The refrigerator according to claim 1, characterized in that: The upper surface and the lower surface of the evaporator (30) are both provided with a heat-insulating cover plate (43); A first defrosting heating tube (40) distributed in a serpentine shape is provided between the heat-insulating cover plate (43) and the upper surface and between the heat-insulating cover plate (43) and the lower surface; The second defrosting heating tube (41) is distributed on the side wall of the evaporator (30) in a serpentine shape.

3. The refrigerator according to claim 1, characterized in that: Also includes: A first sensor (50) is disposed at the lowest temperature point of the fins (301) covered by the upper and lower heat-insulating cover plates (43) of the evaporator (30); The second sensor (51) is disposed at the lowest temperature point on the side of the evaporator (30).

4. The refrigerator according to claim 1, characterized in that: Also includes: The frost containing structure (52) comprises a groove, which is arranged on the inner wall of the heat-insulating cover plate (43) at the top of the evaporator (30) to increase the space between the heat-insulating cover plate (43) and the fins (301) of the evaporator (30).

5. The refrigerator according to claim 1, characterized in that: Also includes: The bypass air passage (53) is arranged between the evaporation pipes.

6. A defrost control method, characterized in that: For use in a refrigerator as claimed in any one of claims 1 to 5, the defrosting control method comprises: Obtain the frosting condition on the evaporator surface; According to the frosting condition on the evaporator surface, the first defrost heating tube and the second defrost heating tube are controlled to start defrosting.

7. The defrost control method according to claim 6, characterized in that: When the refrigerator includes a first sensor (50) and a second sensor (51), obtaining the frosting condition on the surface of the evaporator includes: A first temperature value detected by the first sensor and a second temperature value detected by the second sensor are acquired.

8. The defrost control method according to claim 7, characterized in that: The method of controlling the first defrost heating tube and the second defrost heating tube to start defrosting according to the frosting condition on the surface of the evaporator comprises: When the first temperature value is less than the preset temperature value, the compressor is controlled to stop and the first defrost heating tube is controlled to start defrosting; When the first temperature value is greater than the preset temperature value, or the first defrost heating tube starts defrosting and the defrost time is greater than the first preset time, the first defrost heating tube is controlled to be in a closed state; After the first defrost heating tube stops defrosting and the second temperature value is less than the preset temperature value, the second defrost heating tube is controlled to start defrosting.

9. The defrost control method according to claim 6, characterized in that: The obtaining of the frosting condition on the evaporator surface comprises: Obtain the composition ratio of the mixed refrigerant; Determine the estimated frosting duration based on the ratio of the mixed refrigerant components; The method of controlling the first defrost heating tube and the second defrost heating tube to start defrosting according to the frosting condition on the surface of the evaporator comprises: When the operating time of the refrigerator is not less than the estimated frosting time, the first defrost heating tube and the second defrost heating tube are controlled to start defrosting.

10. A defrost control device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the defrost control method according to any one of claims 6 to 9 when running the program instructions.

Images