Refrigerator

Abstract

The invention relates to the technical field of refrigeration equipment, and discloses a refrigerator. The refrigerator comprises a refrigerating system adopting a mixed refrigerant, and the mixed refrigerant comprises at least one of R600a and R600 and R290; the cabinet body defines a refrigeration space, and the refrigeration space comprises a cryogenic space with the volume of V; the mass ratio W of R290 in the mixed refrigerant is determined by the following formula: W = 1-[k1 * V2-k2 * V + k3]; wherein k1, k2 and k3 are all constants greater than zero. The mass ratio of the R290 in the mixed refrigerant is determined according to the size of the copious cooling space, so that the mass ratio of the R290 corresponds to the size of the copious cooling space, the copious cooling space can accurately reach the needed low temperature, and low power consumption and noise indexes can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a refrigerator. Background Art

[0002] As people's living standards improve, users have higher and higher requirements for the quality of frozen food preservation. For freezers, the requirements for freezing speed and depth are also constantly increasing. Users require fast freezing and low temperature to ensure the freshness of frozen food.

[0003] However, existing refrigerators generally use single-refrigerant refrigerants such as R600a, R600 or R290. The refrigerator using R600a or R600 has low power consumption, but the lowest temperature inside the refrigerator can only reach about -30°C. The refrigerator using R290 has a lower temperature depth, but it is noisy and consumes more power, which does not meet the user's demand for low noise and low power consumption in refrigerators.

[0004] Therefore, how to balance the indicators of low temperature, noise and power consumption in the box is a problem that needs to be solved urgently in this field.

[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 disclosed embodiment provides a refrigerator to solve the problem of balancing the low temperature, noise and power consumption inside the refrigerator.

[0008] According to an embodiment of the present invention, a refrigerator is provided, comprising: a refrigeration system, using a mixed refrigerant, the mixed refrigerant comprising at least one of R600a and R600 and R290; a cabinet body, defining a refrigeration space, the refrigeration space comprising a deep cold space with a volume of V; the mass proportion W of R290 in the mixed refrigerant is determined by the following formula:

[0009] W=1-[k1*V 2 -k2*V+k3];

[0010] Among them, k1, k2 and k3 are all constants greater than zero.

[0011] In some embodiments, the value range of k1 is (7.76E-06)-(8.45E-06); the value range of k2 is 0.003492-0.003625.

[0012] In some embodiments, when the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than the corresponding k3 when the mixed refrigerant is a mixture of R600 and R290.

[0013] In some embodiments, when the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than 1; and / or when the mixed refrigerant is a mixture of R600 and R290, the corresponding k3 is less than 1.

[0014] In some embodiments, when the mixed refrigerant is a mixture of R600a and R290, the corresponding value range of k3 is 1.023932 to 1.076712; and / or when the mixed refrigerant is a mixture of R600 and R290, the corresponding value range of k3 is 0.926932 to 0.974712.

[0015] In some embodiments, the temperature of the cryogenic space can be adjusted in the range of -28°C to 40°C.

[0016] In some embodiments, the refrigeration space further includes: a variable temperature space, and the temperature adjustment range of the variable temperature space is 8 to -26°C.

[0017] In some embodiments, the refrigeration system includes a compressor, which includes: a motor; a crankshaft; and a cylinder, wherein the crankshaft connects the motor and the cylinder; wherein the crankshaft includes a diversion channel and a mainstream channel, wherein the mainstream channel has a three-stage stepped structure, wherein the crankshaft includes a distribution angle less than or equal to 60°.

[0018] In some embodiments, the compressor uses RL22H brand refrigeration oil.

[0019] In some embodiments, the compressor further includes: an intake valve plate, the thickness of which is greater than or equal to 0.17 mm; and / or a cylinder head gasket, the cylinder head gasket being made of a mixed material of metal and nylon.

[0020] The refrigerator provided in the embodiments of the present disclosure can achieve the following technical effects:

[0021] A mixed refrigerant consisting of at least one of R600a and R600 and R290 is used for refrigeration, making full use of the advantages of R600a and R600 in terms of low power consumption and low noise, and the advantage of R290 in terms of lower stretching temperature, to achieve the effect of rapid cooling and low temperature, improve the refrigeration performance of the refrigerator and effectively improve the power consumption and noise indicators.

[0022] The mass proportion of R290 in the mixed refrigerant is determined according to the volume of the cryogenic space, so that the mass proportion of R290 corresponds to the volume of the cryogenic space, so that the cryogenic space can accurately reach the required low temperature and also have low power consumption and noise indicators.

[0023] 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

[0024] 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:

[0025] Figure 1 is an explosion schematic diagram of an evaporator provided by an embodiment of the present disclosure;

[0026] Figure 2 is a structural schematic diagram of an evaporator provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic structural diagram of a thermal insulation cover plate provided by an embodiment of the present disclosure;

[0028] Figure 4 is a partial structural schematic diagram of a refrigerator provided by another embodiment of the present disclosure;

[0029] Figure 5 is a schematic diagram of the structure of a refrigeration system provided by an embodiment of the present disclosure;

[0030] Figure 6 is a flow chart of a defrost control method provided by an embodiment of the present disclosure;

[0031] Figure 7 is a flow chart of a defrost control method provided by another embodiment of the present disclosure;

[0032] Figure 8 is a flow chart of a defrost control method provided by yet another embodiment of the present disclosure;

[0033] Fig. 9 is a structural principle diagram of a defrost control device provided by an embodiment of the present disclosure;

[0034] Fig.10 is a schematic structural diagram of a cylinder head gasket of a compressor of a refrigeration system provided by an embodiment of the present disclosure;

[0035] Fig.11 It is a partial cross-sectional view of a compressor crankshaft of a refrigeration system provided by an embodiment of the present disclosure.

[0036] Reference numerals:

[0037] 1: Refrigeration system; 10: Compressor; 11: Crankshaft; 111: Diverter channel; 112: Main channel; 12: Cylinder head gasket; 20: Refrigerator; 21: Deep cold space; 22: Variable temperature space; 30: Evaporator; 301: Fins; 40: First defrost heating pipe; 41: Second defrost heating pipe; 42: Compressor compartment return air outlet; 43: Insulation cover; 50: First sensor; 51: Second sensor; 52: Frost containment structure; 53: Bypass air passage. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Unless otherwise stated, the term "plurality" means two or more.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] An embodiment of the present disclosure provides a refrigerator, comprising a refrigeration system and a cabinet body.

[0047] The refrigeration system includes a compressor, an evaporator and a condenser in sequence through pipelines. The refrigeration system is used to cool the cabinet.

[0048] The refrigeration system adopts a mixed refrigerant, and the mixed refrigerant includes at least one of R600a, R600 and R290. For example, the mixed refrigerant can be composed of R600a and R290, or R600 and R290, or R600a, R600 and R290.

[0049] The cabinet defines a refrigeration space, which includes a deep freezing space with a volume of V. The temperature adjustment range of the deep freezing space is -28°C--40°C, for example, -28°C, -35°C or -40°C, covering the functions of ordinary freezing and deep freezing to meet the needs of users.

[0050] The mass proportion of various single-refrigerants (R600a, R600 or R290) in the mixed refrigerant affects the temperature depth of the mixed refrigerant. The deep cold space is the space with the lowest temperature required in the refrigeration space and the space with the largest cooling demand in the refrigeration space.

[0051] Therefore, when designing the mass proportion of various single-refrigerants in the mixed refrigerant, the parameters of the cryogenic space are the most important consideration.

[0052] Among the parameters of the cryogenic space, when the required temperature of the cryogenic space is determined, the volume V of the cryogenic space determines the required cooling capacity of the cryogenic space. The cooling capacity required by the cryogenic space can only be met when the mass proportion of various single-refrigerant refrigerants in the mixed refrigerant meets the requirements.

[0053] Therefore, the mass proportion of various single-medium refrigerants in the mixed refrigerant is affected by the volume V of the cryogenic space.

[0054] In most cases, when the temperature in the cryogenic space meets the standard, the temperature of other spaces in the refrigeration space can also meet the standard. Therefore, the mass proportion of various single-refrigerants in the mixed refrigerant is determined only by the volume of the cryogenic space, and the parameters of other spaces in the refrigeration space except the cryogenic space are ignored.

[0055] The specific mass proportion W of R290 in the mixed refrigerant is determined by the following formula:

[0056] W=1-[k1*V 2 -k2*V+k3]; (1)

[0057] Among them, k1, k2 and k3 are all constants greater than zero.

[0058] It should be noted that the unit of the volume V of the cryogenic space 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.

[0059] 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.

[0060] In this way, as the volume V of the deep cold space increases, the mass proportion of R600a first decreases and then increases, and the refrigeration proportion of R290 first increases and then decreases.

[0061] Compared with R600a, R290 is more helpful in achieving low temperatures in cryogenic spaces, and the larger the volume V of the cryogenic space, the greater the amount of cooling required by the cryogenic space. Therefore, the mass proportion of R290 increases first. When the refrigeration system uses R290, the exhaust pressure of the compressor must be large. Therefore, as the mass proportion of R290 increases, the exhaust pressure required by the compressor becomes larger and larger, which will cause the compressor to be unable to meet the needs. Moreover, when the mass proportion of R290 increases to a certain extent, adding more R290 will not have much effect on reducing the temperature of the cryogenic space. Therefore, the mass proportion of R290 will not be controlled to increase continuously. After increasing to a certain extent, the mass proportion of R290 will be controlled to begin to decrease, and finally reach a state that can both meet the low temperature required by the cryogenic space and protect the compressor and avoid damage to the compressor.

[0062] 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.

[0063] In this way, as the volume V of the deep cold space increases, the mass proportion of R600 first decreases and then increases, and the refrigeration proportion of R290 first increases and then decreases.

[0064] Compared with R600, R290 is more helpful in achieving low temperatures in cryogenic spaces, and the larger the volume V of the cryogenic space, the greater the amount of cooling required by the cryogenic space. Therefore, the mass proportion of R290 increases first. When the refrigeration system uses R290, the exhaust pressure of the compressor must be large. Therefore, as the mass proportion of R290 increases, the exhaust pressure required by the compressor becomes larger and larger, which will cause the compressor to be unable to meet the needs. Therefore, the mass proportion of R290 will not be controlled to increase continuously. After increasing to a certain extent, the mass proportion of R290 will be controlled to begin to decrease, and finally reach a level that can both meet the low temperature required by the cryogenic space and protect the compressor and avoid damage to the compressor.

[0065] 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, which can eventually reach the low temperature required by the deep cold space and protect the compressor to avoid damage to the compressor.

[0066] Optionally, the value range of k1 is (7.76E-06)-(8.45E-06), that is, 0.00000776-0.00000845.

[0067] The value range of k2 is 0.003492-0.003625.

[0068] Optionally, when the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than the corresponding k3 when the mixed refrigerant is a mixture of R600 and R290.

[0069] Compared with R600a, R600 has the characteristics of small cooling capacity and low compressor exhaust pressure, that is, R600 has lower performance requirements for the compressor. 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.

[0070] Optionally, when the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than 1.

[0071] When the mixed refrigerant is a mixture of R600 and R290, the corresponding k3 is less than 1.

[0072] Optionally, when the mixed refrigerant is a mixture of R600a and R290, the corresponding value range of k3 is 1.023932 to 1.076712.

[0073] When the mixed refrigerant is a mixture of R600 and R290, the corresponding k3 value range is 0.926932~0.974712.

[0074] Table 1 below shows the relationship between the volume of the cryogenic space, 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, the exhaust temperature of the compressor, the exhaust pressure of the compressor, the suction pressure of the compressor, the refrigeration depth of the cryogenic space, the refrigeration depth of the variable temperature space, power consumption and noise.

[0075] Table 1

[0076]

[0077] 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 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).

[0078] When the volume of the refrigeration space is 198L, the mass proportions of R600a and R290 are 65% and 35% respectively, and the comprehensive indicators of power consumption, noise, and refrigeration depth of the deep refrigeration space are optimal. This is consistent with the result calculated by the above formula (1).

[0079] Table 2 below shows the relationship between the volume of the cryogenic space, 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, the exhaust temperature of the compressor, the exhaust pressure of the compressor, the suction pressure of the compressor, the refrigeration depth of the cryogenic space, the refrigeration depth of the variable temperature space, power consumption and noise.

[0080] Table 2

[0081]

[0082] 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 are optimal when the mass proportion of R600 and R290 is 60% and 40% respectively. This is consistent with the result calculated by the above formula (1).

[0083] When the volume of the refrigeration space is 198L, the mass proportions of R600 and R290 are 55% and 45% respectively, and the comprehensive indicators of power consumption, noise, and refrigeration depth of the deep refrigeration space are optimal. This is consistent with the result calculated by the above formula (1).

[0084] Optionally, the refrigeration space also includes a variable temperature space, and the temperature adjustment range of the variable temperature space is 8 to -26°C, and the temperature range covers refrigeration function, ice temperature, and freezing function.

[0085] Setting up variable temperature space can enrich the refrigeration temperature range of the refrigerator. The combination of variable temperature space and deep freezing space can realize various application scenarios such as refrigeration + freezing, ice temperature + freezing, ice temperature + deep freezing, freezing + freezing, freezing + deep freezing, etc., which can meet users' different functional needs.

[0086] Optionally, the temperature-changing space is located above the cryogenic space. It can be understood that the temperature-changing space is located below the cryogenic space, or the temperature-changing space and the cryogenic space are arranged in the left-right direction.

[0087] Optionally, the compressor is a variable frequency compressor.

[0088] The use of variable frequency compressors can automatically control the compressor speed according to different ambient temperatures and the set temperature of the refrigeration space (including deep cold space and variable temperature space), achieving refrigeration performance while also effectively improving power consumption and noise indicators.

[0089] Combination Fig.10 As shown, optionally, the compressor includes a motor, a crankshaft 1 and a cylinder.

[0090] The crankshaft connects the motor and the cylinder, and comprises a branch channel and a main channel, wherein the main channel has a three-stage stepped structure.

[0091] Specifically, the branch channel of the crankshaft is used to connect with the cylinder, one end of the main channel is connected with the branch channel, and the other end of the main channel has a distribution angle. The main channel has a three-stage stepped structure, that is, the main channel is at least a three-stage telescopic structure.

[0092] Combination Fig.11As shown, optionally, the crankshaft includes a distribution angle less than or equal to 60°. Specifically, the distance of the crankshaft portion A is [60, 65] mm, the distance of the portion B is [40, 45] mm, the distance of the portion C is [38, 42] mm, the distance of the portion D is [20, 25] mm, and the distance of the portion E is [10, 16] mm, and the distribution angle F is less than or equal to 60°. More specifically, the distance of the crankshaft portion A is 63.5 mm, the distance of the portion B is 42.4 mm, the distance of the portion C is 41.4 mm, the distance of the portion D is 23.5 mm, and the distance of the portion E is 13.5 mm, and the distribution angle F is less than or equal to 60°.

[0093] In the related art, the parameters of the compressor crankshaft used in a conventional refrigeration system using a single refrigerant R600a are: the distance of part A is 62mm, the distance of part B is 38mm, the distance of part C is 7mm, the distance of part D is 22mm, the distance of part E is 12mm, and the distribution angle F is equal to 120°.

[0094] Compared with the crankshaft of a conventional compressor, the present invention Figure 2 The structural strength of the crankshaft of the compressor 10 shown in FIG. 1 is improved by at least 50%.

[0095] Optionally, the compressor uses RL22H brand refrigeration oil. Specifically, high-grade ester oil is selected to meet the anti-friction and thermal stability of the refrigeration oil under high exhaust temperature and high exhaust pressure conditions of the embodiment of the present disclosure.

[0096] Optionally, the compressor further includes an air intake valve plate, and the thickness of the air intake valve plate is greater than or equal to 0.17 mm. Specifically, in the related art, the thickness of the air intake valve plate used in the compressor of the refrigeration system using the single refrigerant R600a is usually 0.15 mm. The embodiment of the present disclosure increases the thickness of the air intake valve plate to greater than or equal to 0.17 mm, effectively improving the impact resistance and fatigue resistance of the air intake valve plate.

[0097] Optionally, the compressor further includes a cylinder head gasket, which is made of a mixed material of metal and nylon. Specifically, in the related art, the cylinder head gasket used in the compressor of the refrigeration system using the single refrigerant R600a is usually made of nylon material. The cylinder head gasket of the embodiment of the present disclosure is made of a mixed material of metal and nylon, which better meets the sealing performance and reliability of the cylinder head gasket of the embodiment of the present disclosure under the condition of high exhaust pressure and high exhaust temperature.

[0098] The refrigerator further includes a first defrost heating tube 40 and a second defrost heating tube 50 .

[0099] The evaporator 30 is provided with fins 301 on its surface; the first defrosting heating tubes 40 are provided on the fins 301 on opposite sides of the evaporator 30; the second defrosting heating tubes 41 are provided on the side walls of the evaporator 30 corresponding to the compressor compartment return air outlet 42.

[0100] like Figure 1 and Figure 5 As 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 R600a, one of 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--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.

[0101] 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.

[0102] 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.

[0103] 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 .

[0104] like Figure 1 and Figure 4 As 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.

[0105] 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 .

[0106] 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.

[0107] Optionally, the refrigerator 20 further includes: a bypass air passage 53, which is arranged between the evaporation pipes.

[0108] 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.

[0109] 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 .

[0110] 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.

[0111] Combination Figures 1 to 9 The present disclosure provides a defrosting control method for a refrigerator as in any one of the above embodiments. The control method includes:

[0112] S601, obtaining the frosting condition of the evaporator surface.

[0113] 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.

[0114] Combination Figure 1 and 6 As 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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:

[0119] S701, obtaining a temperature value detected by a first sensor and a temperature value detected by a second sensor.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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:

[0124] S801, obtaining a first temperature value detected by a first sensor and a second temperature value detected by a second sensor.

[0125] 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.

[0126] 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.

[0127] S80221, after the first defrost heating tube stops defrosting and the second temperature value is less than the preset temperature value, control the second defrost heating tube to start defrosting.

[0128] 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.

[0129] 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.

[0130] 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:

[0131] S901, obtaining the mixed refrigerant ratio.

[0132] 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.

[0133] S902: Determine an estimated frosting duration according to the ratio of the mixed refrigerant.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] Optionally, the preset temperature value is 0°C to 5°C.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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, wherein the mixed refrigerant includes at least one of R600a and R600 and R290; The cabinet defines a refrigeration space, wherein the refrigeration space includes a deep cold space with a volume of V; The mass proportion W of R290 in the mixed refrigerant is determined by the following formula: W=1-[k1*V 2 -k2*V+k3]; Among them, k1, k2 and k3 are all constants greater than zero.

2. The refrigerator according to claim 1, characterized in that: The value range of k1 is (7.76E-06)-(8.45E-06); the value range of k2 is 0.003492-0.003625.

3. The refrigerator according to claim 1, characterized in that: When the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than the corresponding k3 when the mixed refrigerant is a mixture of R600 and R290.

4. The refrigerator according to claim 3, characterized in that: When the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 is greater than 1; and / or When the mixed refrigerant is a mixture of R600 and R290, the corresponding k3 is less than 1.

5. The refrigerator according to claim 4, characterized in that: When the mixed refrigerant is a mixture of R600a and R290, the corresponding k3 value range is 1.023932 to 1.076712; and / or When the mixed refrigerant is a mixture of R600 and R290, the corresponding value range of k3 is 0.926932~0.974712.

6. The refrigerator according to claim 1, characterized in that: The temperature adjustment range of the deep cold space is -28°C to 40°C.

7. The refrigerator according to claim 1, characterized in that: The refrigeration space also includes: The variable temperature space has a temperature adjustment range of 8 to -26°C.

8. The refrigerator according to any one of claims 1 to 7, characterized in that: The refrigeration system comprises a compressor, and the compressor comprises: Motor; Crankshaft; and A cylinder, wherein the crankshaft connects the motor and the cylinder; Wherein, the crankshaft includes a branch channel and a main flow channel, wherein the main flow channel has a three-stage stepped structure, and the crankshaft includes a distribution angle less than or equal to 60°.

9. The refrigerator according to claim 8, characterized in that: The compressor uses RL22H brand refrigeration oil.

10. The refrigerator according to claim 8, characterized in that: The compressor also includes: An air intake valve sheet, wherein the thickness of the air intake valve sheet is greater than or equal to 0.17 mm; and / or A cylinder head gasket is made of a mixed material of metal and nylon.

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