Pulse electric field fresh-keeping structure and refrigerator

Abstract

The invention relates to a pulsed electric field fresh-keeping structure and a refrigerator, and belongs to the technical field of refrigerators.The pulsed electric field fresh-keeping structure is used for being arranged in the refrigerator and comprises an air deflector, the first face of the air deflector is configured to face a drawer of the refrigerator, at least one air channel is formed in the air deflector, and the air channel is provided with an air inlet end and an air outlet end which communicate with each other; the air outlet end penetrates through the first face in the thickness direction of the air guide plate, the pulsed electric field module is arranged on the second face of the air guide plate, and airflow entering the air channel through the air inlet end can be exhausted through the air outlet end to blow food materials stored on the inner side of the drawer so as to reduce the temperature of the inner space of the drawer. The pulsed electric field module is configured to generate a pulsed electric field to act on the raw staple food stored on the inner side of the drawer, starch in the raw staple food is subjected to non-thermophysical modification, the content of resistant starch in the raw staple food is increased, the sugar control effect on the raw staple food is improved, and scientific and healthy sugar control staple food is provided for people with the sugar control requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, in particular to a pulse electric field preservation structure and a refrigerator. BACKGROUND

[0002] The sugar control structure used by the refrigerator for the sugar control scheme of the stored staple food is complex, the processing time is long, and it is not suitable for the sugar control processing of raw staple food. SUMMARY

[0003] Therefore, the present application provides a pulse electric field preservation structure and a refrigerator, which can meet the demand for sugar control and preservation of raw staple food.

[0004] In a first aspect, the present application provides a pulse electric field preservation structure for being arranged in a refrigerator, the pulse electric field preservation structure comprising: an air guide plate comprising a first surface and a second surface oppositely arranged along a thickness direction, the first surface being configured to face a drawer in the refrigerator, the air guide plate being provided with at least one air duct, the air duct having an air inlet end and an air outlet end communicating with each other, the air outlet end penetrating through the first surface along the thickness direction; a pulse electric field module arranged on the second surface; wherein the airflow entering the air duct through the air inlet end can be discharged through the air outlet end to form a blowing of the food stored inside the drawer, and the pulse electric field module is configured to generate a pulse electric field to act on the raw staple food stored inside the drawer.

[0005] Optionally, at least one of the following conditions is met:

[0006] a) the electric field strength of the pulse electric field is 25kv / cm-40kv / cm;

[0007] b) the number of pulses is 50-200;

[0008] c) the pulse frequency is 50Hz-100Hz;

[0009] d) the processing temperature T of the pulse electric field module is 0℃<T<35℃.

[0010] Optionally, the first surface of the air guide plate is recessed to form a recessed portion, and the recessed portion forms an air duct inside; the recessed portion extends along the length direction of the air guide plate, and one end of the recessed portion along the length direction penetrates through the air guide plate to form the air inlet end, and the opening of the recessed portion away from the second surface forms the air outlet end.

[0011] Optionally, the recessed portion comprises a straight section and a bent section connected along the length direction; one end of the bent section away from the straight section penetrates through the air guide plate and forms the air inlet end.

[0012] Optionally, the number of the recesses is at least two, and the recesses are arranged at intervals along the width direction of the air deflector; along the length direction, the bending sections of the at least two recesses converge away from one end of the straight section and penetrate through the air deflector to form the air inlet end.

[0013] Optionally, the recess has two side walls arranged oppositely along the width direction of the air deflector, and along the width direction, the distance between the opposite surfaces of the two side walls in the bending section is L1 mm, and the distance between the opposite surfaces of the two side walls in the straight section is L2 mm; L1 < L2 is satisfied.

[0014] Optionally, along the length direction of the air deflector, the value of L1 increases from the end away from the straight section to the end close to the straight section.

[0015] Optionally, the pulse electric field preservation structure further comprises a cover plate, the cover plate is arranged on the first surface of the air deflector, the cover plate is provided with an air outlet hole penetrating through the cover plate along the thickness direction, the air outlet hole is communicated with the recess, and one recess corresponds to at least one air outlet hole in number.

[0016] Optionally, the straight section corresponds to at least one air outlet hole in number; and / or, the bending section corresponds to at least one air outlet hole in number.

[0017] In a second aspect, the embodiments of the present application provide a refrigerator, which comprises: an air duct back plate provided with an air supply port; a drawer arranged on one side of the air duct back plate; and the pulse electric field preservation structure of the first aspect; the air deflector and the cover plate in the pulse electric field preservation structure are stacked along the thickness direction of the air deflector and are stacked with the drawer, the first surface of the air deflector faces the drawer along the thickness direction, the air inlet end of the air deflector is communicated with the air supply port, and the air outlet end faces the drawer.

[0018] The embodiments of the present application provide a pulse electric field preservation structure and a refrigerator comprising the same, the pulse electric field preservation structure is arranged in the refrigerator, comprising an air deflector, the first surface of the air deflector is configured to face a drawer of the refrigerator, at least one air duct is arranged in the air deflector, the air duct has an air inlet end and an air outlet end communicated with each other, the air outlet end penetrates through the first surface along the thickness direction of the air deflector, a pulse electric field module is arranged on the second surface of the air deflector, the airflow entering the air duct through the air inlet end can be discharged through the air outlet end to form a blowing of food materials stored inside the drawer, so as to reduce the temperature of the internal space of the drawer and prolong the preservation period of the food materials, the pulse electric field module is configured to generate a pulse electric field to act on raw food materials stored inside the drawer, to non-thermally physically modify starch in the raw food materials, to increase the content of resistant starch in the raw food materials, to improve the sugar control effect of the raw food materials, and to provide scientific and healthy sugar control food materials for people who need to control sugar. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A first angle exploded structural diagram of the electric field preservation structure provided by the embodiment of the present application;

[0020] Figure 2 A second angle exploded structural diagram of the electric field preservation structure provided by the embodiment of the present application;

[0021] Figure 3 A first angle structural diagram of the air deflector in the electric field preservation structure provided by the embodiment of the present application;

[0022] Figure 4 A second angle structural diagram of the air deflector in the electric field preservation structure provided by the embodiment of the present application;

[0023] Figure 5 A graph of the relationship between the electric field intensity of the pulse electric field and the resistant starch content;

[0024] Figure 6 A graph of the relationship between the pulse number and the resistant starch content;

[0025] Figure 7 A graph of the relationship between the pulse frequency and the resistant starch content;

[0026] Figure 8 A first angle diagram of the partial structure of the refrigerator provided by the embodiment of the present application;

[0027] Figure 9 A second angle diagram of the partial structure of the refrigerator provided by the embodiment of the present application.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 100, pulse electric field preservation structure;

[0030] 10, air deflector; 101, first face; 102, second face; 1021, first groove; 11, air duct; 111, air inlet end; 112, air outlet end; 12, recessed part; 121, straight section; 122, bent section; 123, side wall;

[0031] 20, pulse electric field module; 21, high-voltage pulse generator; 22, electrode assembly; 221, shell; 222, electrode plate;

[0032] 30, cover plate; 31, air outlet hole; 32, cladding part;

[0033] 200, refrigerator; 201, shell; 210, air duct back plate; 211, air supply port; 220, drawer; 230, humidity retaining cover plate;

[0034] X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0035] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following will be described in detail by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as the technical and scientific terms in the technical field to which the present application belongs.

[0036] In the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of the simplified description of the present application, and do not indicate that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, i.e. cannot be understood as limiting the present application.

[0037] In the present application, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly include at least one of the features. In the present application, the meaning of "multiple" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise specifically defined.

[0038] In the present application, unless otherwise explicitly defined, the terms "mounting", "connecting", "connecting", "fixing", "setting", etc. should be broadly understood. For example, "connecting" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly defined, the first feature is "on", "over", "above" and "upper" the second feature, "under", "below" and "lower" the second feature can be the first feature and the second feature directly contact, or the first feature and the second feature indirectly contact through an intermediate medium. Moreover, the first feature is "over", "above" and "upper" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "under", "below" and "lower" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0040] In some embodiments of the present application, a pulse electric field preservation structure 100 is provided for being arranged in a refrigerator 200, referring to Figures 1-6 The pulse electric field preservation structure 100 comprises: an air deflector 10 and a pulse electric field module 20.

[0041] Referring to Figures 1-4 The air deflector 10 has length direction X, width direction Y and thickness direction Z intersecting with each other, and specifically as shown in the embodiment Figures 1-3 The length direction X, the width direction Y and the thickness direction Z are orthogonal to each other, the length direction X is parallel to the depth direction of the refrigerator 200, the width direction Y is parallel to the length direction of the refrigerator 200, and the thickness direction Z is parallel to the height direction of the refrigerator 200.

[0042] The air deflector 10 comprises a first surface 101 and a second surface 102 arranged opposite along the thickness direction Z, the first surface 101 is configured to face the drawer 220 of the refrigerator 200, referring to Figure 2 and Figure 4 The air deflector 10 is provided with at least one air duct 11, the air duct 11 has air inlet end 111 and air outlet end 112 communicating with each other, the air outlet end 112 penetrates the first surface 101 along the thickness direction Z, and the air inlet end 111 penetrates at least one side wall of the air deflector 10.

[0043] Referring to Figure 1 and Figure 2 The electrode plate 20 is arranged on the second surface 102 of the air deflector 10.

[0044] Wherein, the airflow entering the air duct 11 through the air inlet end 111 can be discharged through the air outlet end 112 to form a sweeping of the food materials stored inside the drawer 220, and the pulse electric field module 20 is configured to generate a pulse electric field to act on the raw food materials stored inside the drawer 220.

[0045] Starch food materials are staple foods for people's daily diet, and the digestible and absorbable starch accounts for more than 95% of the total mass of the starch food materials, which is not conducive to postprandial blood glucose stability and weight control, and there is a risk of inducing diabetes, so it is necessary to control the intake of digestible and absorbable starch in staple foods. In order to control the intake of digestible and absorbable starch, a sugar control program is usually adopted. Specifically, blood glucose refers to the content of glucose in the blood, and the sugar (such as monosaccharides, disaccharides and starch) in food is the main source of blood glucose, among which resistant starch (RS) is not easily absorbed by the human body due to its energy dilution and swelling effect, but can increase satiety, and can reduce or limit further eating of the human body, thereby effectively reducing energy intake and reducing blood glucose load, and then serving as the main control component of the sugar control program, sugar control refers to controlling the content of resistant starch in food.

[0046] Current staple food sugar control technologies mainly have the following ways:

[0047] A. Adding resistant starch fortifier to staple food, and the staple food modified by the resistant starch fortifier has a too high heating and gelatinization temperature in the preparation process, which cannot well maintain the original appearance and taste of the staple food, and the user's acceptability is poor, and the staple food modified by the resistant starch fortifier has certain safety hazards.

[0048] B. Using a sugar-reducing cooking device and method for cooking, for example, separating the rice soup when cooking rice to half-cooked, and reducing and controlling sugar by draining a small amount of digestible and absorbable starch and sugar in the rice soup. This technology can reduce a small amount of sugar, but it will cause the loss of nutrients such as vitamins and amino acids, and also affect the taste.

[0049] C. Using a sugar control device for sugar control, specifically, using a heat pipe with high heat transfer capacity to conduct heat from the heat source to the cold end of the semiconductor sheet, so that the hot end of the semiconductor sheet obtains a higher temperature for heating the starch food material, and the semiconductor sheet is reversely powered to exchange the cold and hot ends. The hot end of the semiconductor sheet cools down in the low-temperature environment inside the refrigerator, so that the cold end of the semiconductor sheet generates a lower temperature to uniformly cool the starch food material. The starch food material preserved by heating and cooling can achieve the purpose of reducing sugar, but the technology structure is complex, and it needs to be heated in the refrigerator, which causes large energy consumption of the refrigerator.

[0050] D. Determining a sugar control program based on the type information of the food material to be processed, which helps to optimize the processing conditions of the food material and improve the sugar control effect. This technology processes cooked food materials and has a long processing time, which is not suitable for sugar control processing of raw staple foods.

[0051] The pulse electric field preservation structure 100 provided by the embodiment of the present application is arranged in the refrigerator 200, and includes the air deflector 10. The first surface 101 of the air deflector 10 is configured to face the drawer 220 of the refrigerator 200. The air deflector 10 is provided with at least one air duct 11. The air duct 11 has an air inlet end 111 and an air outlet end 112 which are communicated with each other. The air outlet end 112 penetrates the first surface 101 along the thickness direction of the air deflector 10, so that the airflow entering the air duct 11 through the air inlet end 111 can be discharged through the air outlet end 112 to form a blowing on the food stored inside the drawer 220, so as to reduce the temperature of the internal space of the drawer 220, prolong the preservation period of the food, and arrange the pulse electric field module 20 on the second surface 102 of the air deflector 10. The pulse electric field module 20 is configured to generate a pulse electric field to act on the raw food stored inside the drawer 220. The pulse electric field can perform non-thermal physical modification on the starch in the raw food, perform micro-surgery on the starch in the raw food through physical force (such as electromagnetic force), form “electroporation” on the cell membrane and starch granule membrane in the starch, increase the permeability of the starch, facilitate the dissolution of amylose inside the starch, increase the supply of raw materials (amylose), strengthen the contact area and contact quantity of the starch and lipids, so that the dissolved amylose can form amylose-lipid complex RS5 with the added lipids, thereby increasing the content of amylose-lipid complex RS5 in the raw food, improving the sugar control effect on the raw food, and providing a scientific and healthy sugar control food for people who need to control sugar.

[0052] After the raw food is cooked (such as heated, gelatinized), cooled, the amylose-lipid complex RS5 in the raw food forms a retrograded resistant starch RS3. Moreover, the dissolved amylose and the short amylose fragments generated by degradation can also generate the retrograded resistant starch RS3, so as to increase the content of the retrograded resistant starch RS3 after the raw food is cooked and cooled, and further increase the content of the resistant starch in the cooked food compared with the content of the resistant starch in the raw food by 50% to 150% after the raw food is cooked and cooled to form the cooked food, thereby improving the sugar control effect of the cooked food and providing a scientific and healthy sugar control cooked food for people who need to control sugar.

[0053] In addition, the structure design of the air duct 11 in the air deflector 10 enables the airflow entering the air duct 11 through the air inlet end 111 to be discharged through the air outlet end 112, so that the temperature of the internal space of the drawer 220 is kept in a low-temperature environment, such as 0℃ to 4℃. The generation speed of the retrograded resistant starch RS3 is related to the cooling rate, and the low-temperature environment can increase the content of the retrograded resistant starch RS3, so as to further increase the content of the retrograded resistant starch RS3 in the cooked food after the raw food is cooked and cooled to form the cooked food, improve the sugar control effect of the cooked food, and provide a scientific and healthy sugar control food for people who need to control sugar.

[0054] In addition, the pulse electric field generated by the pulse electric field module 20 can act on the raw staple food stored in the drawer 220 at room temperature or low temperature, avoiding the damage of heat processing to the flavor and nutrition of the raw staple food, and improving the preservation quality of the raw staple food.

[0055] In some embodiments, the raw staple food includes but is not limited to dough, raw potatoes, raw chestnuts, and rice soaked after soaking.

[0056] In some embodiments, the electric field strength of the pulse electric field is 25kv / cm~40kv / cm. Referring to Figure 5 , the electric field strength of the pulse electric field is in the range of 25kv / cm~40kv / cm, so that the electric pulse in the pulse electric field can form effective "electroporation" on the cell membrane and starch granule membrane in the starch, thereby ensuring the permeability of the starch, and without damaging the internal structure of the starch, ensuring the improvement of the resistant starch content in the raw staple food. As shown in Figure 5 , the electric field strength is 25kv / cm~40kv / cm, and the relative resistant starch content can reach 115%~125%.

[0057] In some embodiments, the electric field strength of the pulse electric field is 30kv / cm.

[0058] In some embodiments, the number of pulses in the pulse electric field is 50~200. Referring to Figure 6 , the number of pulses is in the range of 50~200, so that the electric pulse in the pulse electric field can form effective "electroporation" on the cell membrane and starch granule membrane in the starch, thereby ensuring the permeability of the starch, so that the starch can be fully modified, and the processing efficiency of the pulse electric field on the raw staple food can be ensured, and the heat effect caused by too many pulses can be avoided. As shown in Figure 6 , the number of pulses is 50~200, and the relative resistant starch content is as high as 118%~126%.

[0059] In some embodiments, the pulse frequency is 50Hz~100Hz. Referring to Figure 7 , the pulse frequency is in the range of 50Hz~100Hz, so that the electric pulse in the pulse electric field can form effective "electroporation" on the cell membrane and starch granule membrane in the starch, thereby ensuring the permeability of the starch, so that the starch can be fully modified, and the processing efficiency of the pulse electric field on the raw staple food can be ensured, and the heat effect caused by too many pulses can be avoided. As shown in Figure 7 , the pulse frequency is 50Hz~100Hz, and the relative resistant starch content is as high as 118%~125%.

[0060] In some embodiments, the processing temperature T of the pulse electric field module 20 is 0℃<T<35℃. The processing temperature T in the range of 0℃<T<35℃ can avoid gelatinization of starch in the raw food during the processing, and ensure the content of resistant starch. The temperature range of 0℃<T<35℃ is suitable for the temperature in the refrigeration compartment of the refrigerator 200.

[0061] In some embodiments, the single processing time of the pulse electric field module 20 is 1s~2s.

[0062] In some embodiments, referring to Figure 9 , the pulse electric field module 20 includes a high-voltage pulse generator 21 and an electrode assembly 22. The high-voltage pulse generator 21 is configured to be arranged on an outer wall surface of the drawer 220 of the refrigerator 200, and is arranged in a separate shielding metal box. As shown in the embodiment Figure 9 , the high-voltage pulse generator 21 is arranged on the outer wall surface of the drawer 220 adjacent to one end of the air duct back plate 210 in the depth direction of the refrigerator 200. The electrode assembly 22 is configured to be arranged on the second surface 102 of the air deflector 10. The output end of the high-voltage pulse generator 21 is electrically connected to the input end of the electrode assembly 22. The high-voltage pulse generator 21 and the electrode assembly 22 can be obtained by purchase.

[0063] The high-voltage pulse generator 21 includes a high-voltage DC power supply pack (not shown in the figure) and a pulse shaping assembly (not shown in the figure) and a control circuit (not shown in the figure) electrically connected to the high-voltage DC power supply pack, respectively.

[0064] The high-voltage DC power supply pack is configured to be able to convert 12V DC into stable DC high-voltage, and to be able to output 25kv~40kv DC high-voltage.

[0065] The pulse shaping assembly includes a high-voltage capacitor (energy storage), a high-speed semiconductor switch, an inductor, and a resistor. The pulse shaping assembly is configured to be able to pulse modulate the DC high-voltage converted by the high-voltage DC power supply pack to form pulse high-voltage, so that the high-voltage pulse generator outputs pulse high-voltage. The pulse shaping assembly is configured to be able to control the width (10μs~20μs), shape (usually square wave or exponential decay wave), and frequency (50Hz~100Hz) of the pulse.

[0066] The control circuit is configured to be able to communicate with the main control board (not shown in the figure) of the refrigerator 200 to receive the instructions of the main control board, and to control the number of pulses according to the instructions.

[0067] The electrode assembly 22 comprises two electrode plates (not shown in the figure) arranged in parallel, and electrically connected to the output end of the high-voltage pulse generator 21 and the ground, respectively. The pulse high-voltage output by the output end of the high-voltage pulse generator 21 can generate a pulse electric field between the two electrode plates to act on the raw food stored in the drawer 220 of the refrigerator 200.

[0068] The distance between the two electrode plates can be set according to actual needs, so that the electric field strength of the pulse electric field is in the range of 25kv / cm~40kv / cm.

[0069] In some embodiments, the high-speed semiconductor switch is selected from at least one of IGBT (Insulated Gate Bipolar Transistor) and MOSFET (Metal-Oxide-Semiconductor Transistor).

[0070] In some embodiments, the opposite surface of one electrode plate to the other electrode plate is a working surface, and the surface of the electrode plate outside the working surface is provided with an insulating coating layer to prevent damage to the internal electrical components of the refrigerator 200 caused by discharge. The material of the electrode plate is food-grade 316 stainless steel, which is corrosion-resistant and easy to clean. The material of the insulating coating layer is food-grade engineering plastic, such as PEEK (Polyether Ether Ketone) and Teflon.

[0071] In some embodiments, referring to Figure 2 and Figure 4 , the first surface 101 of the air deflector 10 is partially recessed to form a recessed portion 12, and the air duct 11 is formed inside the recessed portion 12. The recessed portion 12 extends along the length direction X of the air deflector 10, and one end of the recessed portion 12 penetrates through the side wall of the air deflector 10 to form the air inlet end 111, and the other end of the recessed portion 12 is open to form the air outlet end 112. Specifically, referring to Figure 2 and Figure 4 , the cross-sectional shape of the recessed portion 12 is a concave shape, the air duct 11 is formed inside the recessed portion 12, the recessed portion 12 extends along the length direction X of the air deflector 10, and one end of the recessed portion 12 penetrates through the side wall of the air deflector 10 to form the air inlet end 111 of the air duct 11, and the other end of the recessed portion 12 is closed to form a closed end (not shown in the figure), the concave cross-sectional structure of the recessed portion 12 makes the other end of the recessed portion 12 open along the thickness direction Z away from the second surface 102, which forms the air outlet end 112 of the air duct 11, and makes the air inlet end 111 and the air outlet end 112 communicate.

[0072] The structure of the closed end of the recessed portion 12 is configured such that the airflow entering the air duct 11 via the air inlet end 111 is blocked by the closed end and can be discharged from the air outlet end 112 in the thickness direction Z, in combination with the air outlet end 112 penetrating toward the first face 101 of the drawer 220, so that the airflow discharged from the air outlet end 112 can blow toward the drawer 220, forming a sweeping effect on the food materials stored inside the drawer 220, reducing the temperature inside the drawer 220, for example, so that the temperature inside the drawer 220 reaches the low-temperature condition of 0°C~4°C for rapid aging and regeneration of starch, thereby effectively increasing the content of resistant starch RS3 in the cooked staple food after the staple food is cooked.

[0073] In addition, the structure design of the opening of the recessed portion 12 at one end away from the second face 102 in the thickness direction Z forms the air outlet end 112, which can increase the air outlet area, so that the airflow entering the air duct 11 via the air inlet end 111 can form a sweeping effect on the drawer 220 along the length direction X of the air deflector 10, improving the uniformity of the temperature distribution inside the drawer 220 along the length direction X, and ensuring the quality of the food materials.

[0074] In some embodiments, referring to Figure 2 and Figure 4 , the recessed portion 12 includes a straight segment 121 and a bent segment 122 connected along the length direction X, and the bent segment 122 penetrates the air deflector 10 at one end away from the straight segment 121 to form the air inlet end 111. Specifically, the bent segment 122 penetrates the adjacent side wall of the air deflector 10 at one end away from the straight segment 121 along the length direction X to form the air inlet end 111, and the straight segment 121 is closed at one end away from the bent segment 122 along the length direction X to form the closed end. The arrangement of the bent segment 122 can prolong the flow path of the airflow entering the air duct 11 via the air inlet end 111, thereby reducing the noise generated by the air deflector 10 and improving the user experience.

[0075] In some embodiments, referring to Figure 2 and Figure 4 , the number of recessed portions 12 is at least two, and they are arranged at intervals along the width direction Y of the air deflector 10. Along the length direction X, the bent segments 122 of the at least two recessed portions 12 converge at one end away from the straight segments 121 and penetrate the air deflector 10 to form the air inlet end. Specifically, the bent segments 122 of the at least two recessed portions 12 converge at one end away from the straight segments 121 along the width direction of the air deflector 10 and penetrate the adjacent side wall of the air deflector 10 to form the air inlet end 111 of the air duct 11, so that the at least two recessed portions 12 share one air inlet end 111, improving the space utilization rate. Moreover, the structure design of the convergence of the at least two bent segments 122 at the position close to the air inlet end 111 allows the airflow entering the air duct 11 via the air inlet end 111 to directly enter each recessed portion 12, ensuring the air inlet speed and thereby ensuring the air outlet speed, and ensuring the cooling effect of the sweeping effect on the food materials stored inside the drawer 220.

[0076] The structure design of the at least two recesses 12 forms at least two air ducts 11 on the first face 101 of the air deflector 10, thereby ensuring the uniformity of the blowing and distribution of the air to the food materials stored inside the drawer 220, improving the uniformity of the temperature distribution along the length direction X inside the drawer 220, and ensuring the quality of the food materials.

[0077] In some embodiments, referring to Figure 2 and Figure 4 , the number of recesses 12 is three, and the three recesses 12 are arranged at intervals along the width direction Y of the air deflector 10. The bending sections 122 of the three recesses 12 are close to each other along the width direction Y and converge at one end of the straight sections 121, and pass through the side walls of the adjacent air deflectors 10, so that the three recesses 12 share one air inlet end 111, and the air flow entering the recesses 12 through the air inlet end 111 enters the three recesses 12 respectively, thereby ensuring the uniformity of the blowing and distribution of the air to the food materials stored inside the drawer 220, and further ensuring the uniformity of the temperature distribution along the length direction X inside the drawer 220, and ensuring the quality of the food materials. In other implementations, the number of recesses 12 can be selected according to actual use requirements, and is not specifically limited.

[0078] In some embodiments, referring to Figure 4 , the recess 12 has two side walls 123 arranged opposite to each other along the width direction Y of the air deflector 10. Along the width direction Y, the distance between the opposite faces of the two side walls 123 in the bending section 122 is L1 mm, and the distance between the opposite faces of the two side walls 123 in the straight section 121 is L2 mm; and L1 < L2 is satisfied.

[0079] Since the bending section 122 is adjacent to the air inlet end 111, and the straight section 121 is away from the air inlet end 111, the temperature inside the drawer 220 corresponding to the bending section 122 is lower than the temperature inside the drawer 220 corresponding to the straight section 121.

[0080] In the air deflector 10 provided by the embodiments of the present application, the distance L1 between the two side walls 123 in the bending section 122 is smaller than the distance L2 between the two side walls 123 in the straight section 121, so that when the air flow entering the recess 12 through the air inlet end 111 enters the straight section 121 through the bending section 122, the air outlet speed can be improved, that is, the speed of the air flow flowing in the bending section 122 is lower than the speed of the air flow flowing in the straight section 121, thereby improving the cooling speed inside the drawer 220 corresponding to the straight section 121, further reducing the temperature difference between the inside of the drawer 220 corresponding to the bending section 122 and the inside of the drawer 220 corresponding to the straight section 121, improving the uniformity of the temperature distribution along the length direction X inside the drawer 220, and ensuring the quality of the food materials.

[0081] In some embodiments, referring to Figure 1 , the value of L1 increases from the end of the flat section 121 away from the end of the flat section 121 close to. The structure design that the value of the interval L1 between the two side walls 123 in the bending section 122 increases from the end of the flat section 121 away from the end of the flat section 121 close to makes the flow speed of the air flow entering the recess 12 through the air inlet end 111 gradually increase in the bending section 121, thereby reducing the temperature difference between the inside of the drawer 220 corresponding to the bending section 122 and the inside of the drawer 220 corresponding to the flat section 121, improving the uniformity of the internal temperature distribution of the drawer 220 along the length direction X, and ensuring the quality of the food materials.

[0082] In some embodiments, referring to Figure 2 and Figure 2 , the electric field fresh-keeping structure 100 further comprises a cover plate 30, the cover plate 30 is arranged on the first surface 101 of the air deflector 10, the cover plate 30 is provided with an air outlet hole 31 penetrating through the cover plate 30 along the thickness direction Z, the air outlet hole 31 is configured to communicate with the air outlet end 112, and one recess 12 corresponds to at least one air outlet hole 31 in number. The arrangement of the cover plate 30 can form support and protection for the air deflector 10 and ensure the installation stability of the air deflector 10 in the refrigerator 200. The arrangement of the air outlet hole 31 can guide the air outlet of the air flow in the air duct 11 defined by the recess 12 and limit the air outlet range, so that the air flow discharged through the air outlet hole 31 forms a specific range of blowing in the drawer 220, ensuring the uniformity of the internal temperature distribution of the drawer 220.

[0083] In some embodiments, referring to Figure 2 , the flat section 121 corresponds to at least one air outlet hole 31 in number. Specifically, the air outlet end 112 of the flat section 121 corresponds to at least one air outlet hole 31 in number, thereby limiting the air outlet range of the air flow in the flat section 121.

[0084] In some embodiments, referring to Figure 2 , the bending section 122 corresponds to at least one air outlet hole 31 in number. Specifically, the air outlet end 112 of the bending section 122 corresponds to at least one air outlet hole 31 in number, thereby limiting the air outlet range of the air flow in the bending section 122.

[0085] In some embodiments, referring to Figure 1, a flat section 121 corresponds to one air outlet hole 31 in number, and a bent section 122 corresponds to one air outlet hole 31 in number, so that the airflow entering the recessed portion 12 via the air inlet end 111 can be discharged by the air outlet hole 31 corresponding to the bent section 122 and the air outlet hole 31 corresponding to the flat section 121 respectively, thereby limiting the air outlet range and achieving blowing of a specific area inside the drawer 220, and ensuring uniformity of the temperature distribution of the inside of the drawer 220 along the length direction X of the air deflector 10. In other implementations, the number of air outlet holes 31 can be rotated according to actual use requirements, and is not specifically limited.

[0086] In some embodiments, referring to Figure 2 and Figure 3 , the cover plate 30 further comprises a cladding portion 32, which is protrusively arranged on one side of the cover plate 30 along the thickness direction Z towards the air deflector 10, and surrounds the cover plate 30 along the circumferential direction of the cover plate 30. The cover plate 30 is arranged on the first surface 101 of the air deflector 10, and the cladding portion 32 abuts against the side wall of the air deflector 10 to form protection for the air deflector 10.

[0087] In some embodiments, an opening (not shown in the figure) is formed in the cladding portion 32 at a position corresponding to the air inlet end 111, so as to expose the air inlet end 111 and ensure smoothness of the airflow entering the air duct 11 via the air inlet end 111.

[0088] In some embodiments, referring to Figures 8-9 , the second surface 102 of the air deflector 10 is provided with a first recess 1021, and the electrode assembly 22 in the pulsed electric field module 20 is embedded in the first recess 1021. The first recess 1021 can improve the installation stability of the electrode assembly 22 on the air deflector 10.

[0089] In some embodiments, the material of the air deflector 10 is foam.

[0090] In some embodiments, the material of the cover plate 30 is foam.

[0091] In some embodiments of the present application, a refrigerator 200 is also provided, referring to Figure 9 , the refrigerator 200 comprises an air duct back plate 210, a drawer 220, and the pulsed electric field fresh-keeping structure 100 as described above.

[0092] Referring to ​The air duct back plate 210 is provided with an air supply port 211. The drawer 220 is arranged on one side of the air duct back plate 210. The air deflector 10 and the cover plate 30 in the pulse electric field preservation structure 100 are stacked along the thickness direction Z of the air deflector 10 and are stacked with the drawer 220. The first surface 101 of the air deflector 10 faces the drawer 220 along the thickness direction Z. The air inlet end 111 of the air deflector 10 is in communication with the air supply port 211. The air outlet end 112 faces the inside of the drawer 220.

[0093] During the operation of the refrigerator 200, the cold air generated by the refrigerator 200 enters the air duct 11 of the air deflector 10 through the air supply port 211 and the air inlet end 111 in communication, and enters the inside of the drawer 220 through the air outlet end 112, thereby forming a sweeping effect on the food materials stored in the inside of the drawer 220, so as to reduce the temperature of the inside space of the drawer 220.

[0094] When the user puts the raw staple food into the drawer 220, the main control board of the refrigerator 200 sends an instruction to the control circuit in the high-voltage pulse generator 21 of the pulse electric field module 20. The power supply of the refrigerator 200 provides 12V direct current to the high-voltage direct current power supply pack. The high-voltage direct current power supply pack converts the 12V direct current into 25kv-40kv direct current high voltage. The pulse shaping assembly modulates the direct current high voltage converted by the high-voltage direct current power supply pack to form pulse high voltage with a pulse frequency of 50Hz-100Hz and a pulse number of 50-200. The high-voltage direct current power supply pack transmits the pulse high voltage to the electrode plate in the electrode assembly 22 to form a pulse electric field between the two electrode plates. The pulse electric field acts on the raw staple food stored in the inside of the drawer 220 for 1s-2s. Specifically, the pulse electric field performs non-thermal physical modification on the starch in the raw staple food. The starch in the raw staple food is micro-operated by physical force (such as electromagnetic force) to form “electroporation” on the cell membrane and starch granule membrane in the starch, increase the permeability of the starch, facilitate the dissolution of the amylose inside the starch, increase the supply of raw materials (amylose), strengthen the contact area and contact number of the starch and lipids, so that the dissolved amylose can form amylose-lipid complex RS5 with the added lipids, thereby increasing the content of amylose-lipid complex RS5 in the raw staple food and improving the glycemic control effect of the raw staple food. The scientific and healthy glycemic control staple food is provided for people who need glycemic control.

[0095] And the user puts the cooked staple food obtained by aging the raw staple food treated by the pulse electric field module 20 back into the drawer 220, and the cold air generated in the operation of the refrigerator 200 enters the air duct 11 of the air deflector 10 through the air outlet 211 and the air inlet 111 connected in communication, and enters the inside of the drawer 220 through the air outlet end 112, forming sweeping of the cooked staple food put back into the drawer 220, improving the cooling rate of the cooked staple food, and then improving the content of the resistant starch RS3 in the cooked staple food, improving the sugar control effect on the cooked staple food, and providing a scientific and healthy sugar control staple food for people who need to control sugar.

[0096] In some embodiments, the drawer 220 is made of high-strength and high-insulation engineering plastic, and the inner wall is smooth and seamless, facilitating cleaning.

[0097] The refrigerator 200 provided by the embodiments of the present application will be described below in conjunction with specific embodiments.

[0098] Embodiment 1

[0099] The soaked japonica rice is placed in the drawer 220, and the pulse electric field module 20 is turned on to treat the japonica rice, the treatment time is 2s, the electric field strength of the pulse electric field is 30kv / cm, the pulse number is 100, the pulse frequency is 50Hz-100Hz, and the treatment temperature T is 4℃. The resistant starch (RS) content in the treated japonica rice is shown in Table 1.

[0100] Embodiment 2

[0101] The japonica rice is replaced by raw potatoes, and the rest is the same as in Embodiment 1. The resistant starch (RS) content in the treated raw potatoes is shown in Table 1.

[0102] Comparative Example 1

[0103] The soaked japonica rice is placed in the drawer 220, and the pulse electric field module 20 is turned off. The resistant starch (RS) content in the treated japonica rice is shown in Table 1.

[0104] Comparative Example 2

[0105] The japonica rice is replaced by raw potatoes, and the rest is the same as in Comparative Example 1. The resistant starch (RS) content in the treated raw potatoes is shown in Table 1.

[0106] Table 1

[0107]

[0108] As shown in Table 1, the resistant starch content in the soaked japonica rice without treatment by the pulse electric field preservation structure 100 is only 2.98%, while the resistant starch content in the soaked japonica rice treated by the pulse electric field preservation structure 100 provided by the embodiments of the present application is 5.34%, and the RS improvement rate is as high as 79.19%.

[0109] The resistant starch content in the raw potatoes not treated by the pulse electric field fresh-keeping structure 100 is only 3.54%, while the resistant starch content in the raw potatoes treated by the pulse electric field fresh-keeping structure 100 provided in the embodiments of the present application is 6.58%, and the RS improvement rate is as high as 85.88%.

[0110] As can be seen, the raw staple food treated by the pulse electric field fresh-keeping structure 100 provided in the embodiments of the present application can significantly improve the resistant starch content, thereby improving the sugar control effect on the raw staple food, and providing a scientific and healthy sugar control staple food for people with sugar control needs.

[0111] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes can also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application that can not have been explicitly described. Therefore, the above embodiments only express several implementation manners of the present application, and do not limit the protection scope of the patent of the present application.

Claims

1. A pulsed electric field preservation structure, characterized in that, The pulsed electric field preservation structure, intended for installation in a refrigerator, includes: An air guide plate includes a first surface and a second surface disposed opposite to each other along the thickness direction. The first surface is configured to face the drawer in the refrigerator. The air guide plate is provided with at least one air duct, which has an air inlet end and an air outlet end communicating with each other. The air outlet end extends through the first surface along the thickness direction. A pulsed electric field module is disposed on the second surface; The airflow entering the air duct through the air inlet can be discharged through the air outlet to sweep the food stored inside the drawer. The pulse electric field module is configured to generate a pulse electric field to act on the raw staple food stored inside the drawer.

2. The pulsed electric field preservation structure according to claim 1, characterized in that, At least one of the following conditions must be met: a) The electric field strength of the pulsed electric field is 25 kV / cm to 40 kV / cm; b) The number of pulses is 50 to 200; c) The pulse frequency is 50Hz~100Hz; d) The processing temperature T of the pulsed electric field module is 0℃. <T<35℃。 3. The pulsed electric field preservation structure according to claim 1, characterized in that, The first surface of the air guide plate is recessed to form a recessed portion, and the air duct is formed inside the recessed portion. The recessed portion extends along the length direction of the air guide plate, and one end of the recessed portion along the length direction passes through the air guide plate to form the air inlet end. The opening at one end of the recessed portion away from the second surface along the thickness direction forms the air outlet end.

4. The pulsed electric field preservation structure according to claim 3, characterized in that, The recessed portion includes a straight section and a bent section connected along the length direction; The end of the bent section away from the straight section passes through the air guide plate and forms the air inlet.

5. The pulsed electric field preservation structure according to claim 4, characterized in that, The number of the recesses is at least two, and they are arranged at intervals along the width direction of the air guide plate; Along the length direction, at least two of the bent sections of the recesses converge at the ends away from the straight section and pass through the air guide plate to form the air inlet.

6. The pulsed electric field preservation structure according to claim 4, characterized in that, The recessed portion has two sidewalls that are arranged opposite each other along the width direction of the air guide plate. Along the width direction, the distance between the opposite faces of the two sidewalls in the bent section is L1 mm, and the distance between the opposite faces of the two sidewalls in the straight section is L2 mm. The condition is satisfied that L1 < L2.

7. The pulsed electric field preservation structure according to claim 6, characterized in that, Along the length of the air guide plate, the value of L1 increases from the end away from the straight section to the end closer to the straight section.

8. The pulsed electric field preservation structure according to claim 4, characterized in that, The pulsed electric field preservation structure also includes a cover plate, which is placed on the first side of the air guide plate. The cover plate has an air outlet hole that extends through the cover plate along the thickness direction and is connected to the recessed portion. Each of the recesses corresponds to at least one of the air outlets.

9. The pulsed electric field preservation structure according to claim 8, characterized in that, The straight section corresponds to at least one of the air outlets; And / or, the number of the bent segments corresponds to at least one of the air outlets.

10. A refrigerator, characterized in that, The refrigerator includes: The back panel of the air duct is equipped with an air outlet. A drawer is located on one side of the air duct back panel; and The pulsed electric field preservation structure as described in any one of claims 1 to 9; In the pulsed electric field preservation structure, the air guide plate and the cover plate are stacked along the thickness direction of the air guide plate and stacked with the drawer. The first side of the air guide plate faces the drawer along the thickness direction. The air inlet end of the air guide plate is connected to the air outlet, and the air outlet end faces the drawer.

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