Fresh-keeping drawer and refrigerator

Abstract

The invention discloses a fresh-keeping drawer and a refrigerator. The fresh-keeping drawer comprises a drawer body, the fresh-keeping drawer comprises a drawer body and further comprises a buffer chamber, a modified adsorbent is arranged in the buffer chamber, the buffer chamber is communicated with the drawer body, and the modified adsorbent is used for adsorbing carbon dioxide and desorbing the carbon dioxide through heating; the electrolytic bath is internally provided with salt water, a cathode electrolytic bath and an anode electrolytic bath are formed through an ion exchange membrane, and the cathode electrolytic bath is communicated with the buffer chamber and the drawer body; a gas inlet of the illumination reaction chamber is communicated with the cathode electrolytic bath and the anode electrolytic bath respectively, and a gas outlet of the illumination reaction chamber is communicated with the cathode electrolytic bath. A self-circulation chemical absorption system constructed by electrolyzing a saline solution is matched with a modified adsorbent to realize consumable-free and normal-pressure adsorption-desorption of carbon dioxide, so that the concentration of carbon dioxide in the drawer body is proper and stable, and the problem of carbon dioxide metabolic acidosis in the fresh-keeping process of fruits and vegetables is solved; and the fruits and vegetables can be kept fresh for a longer time and with higher quality.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, and in particular to a fresh-keeping drawer and a refrigerator. Background Art

[0002] Carbon dioxide has the function of regulating the physiological and biochemical reactions of fruits and vegetables. The appropriate concentration in the storage environment can keep fruits and vegetables fresh. The carbon dioxide content in the air is only 0.03%, which is far lower than the concentration commonly used to regulate the physiological and biochemical reactions of fruits and vegetables (2% to 10%). The carbon dioxide produced by the respiration of fruits and vegetables is slow. It takes a long time to establish an atmosphere-controlled environment that can regulate the physiological and biochemical reactions of fruits and vegetables by relying solely on the self-respiration of fruits and vegetables. The time to achieve this is even after the fruits and vegetables have spoiled. Therefore, it is necessary to actively adjust the carbon dioxide concentration to achieve the purpose of fruit and vegetable preservation.

[0003] Physical adsorption is the main method for collecting and releasing carbon dioxide at present, which mainly includes pressure swing adsorption technology, vacuum swing adsorption technology, temperature swing adsorption technology, electric swing adsorption technology, etc. It mainly utilizes variable pressure or vacuum to realize the adsorption and desorption of carbon dioxide, changes the temperature of the adsorption material to realize the adsorption and desorption of carbon dioxide, changes in power on and off to realize the adsorption and desorption of carbon dioxide, etc. to first adsorb carbon dioxide in the gas to separate it from oxygen and nitrogen, and then release and enrich the carbon dioxide through desorption, so as to achieve the function of regulating the concentration of carbon dioxide. It has the advantages of no consumable loss and large processing capacity, but often has disadvantages such as the need for high temperature, high pressure, and high-rigidity structural shell.

[0004] The chemical absorption method mainly utilizes the acidic properties of carbon dioxide and alkaline solutions for absorption. Commonly used chemical absorbents include monoethanolamine, diethanolamine, etc., which have the advantages of high absorption efficiency, room temperature, normal pressure and low pressure and low concentration absorption. However, when used to preserve fruits and vegetables in refrigerators, there are problems such as chemical reagent loss and reagent leakage risk.

[0005] Therefore, how to provide a refrigerator drawer that combines physical adsorption and chemical absorption and can quickly adjust carbon dioxide at normal pressure is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The invention provides a fresh-keeping drawer and a refrigerator, which are used to solve the problem in the prior art that the refrigerator drawer cannot use a physical adsorption method and a chemical absorption method in combination and cannot operate at normal pressure.

[0007] The technical solution of the present invention is a fresh-keeping drawer, comprising a drawer body; the fresh-keeping drawer also includes:

[0008] a buffer chamber, in which a modified adsorbent is arranged, the buffer chamber is communicated with the drawer body, the modified adsorbent is used to adsorb carbon dioxide and desorb the carbon dioxide by heating;

[0009] An electrolytic cell, which has salt water inside and forms a cathode electrolytic cell and an anode electrolytic cell through an ion exchange membrane, wherein the cathode electrolytic cell is communicated with the buffer chamber and the drawer body respectively;

[0010] The light irradiation reaction chamber has an air inlet which is respectively connected to the cathode electrolytic cell and the anode electrolytic cell, and a gas outlet which is connected to the cathode electrolytic cell.

[0011] Furthermore, a pH sensor is provided in the cathode electrolytic cell, and a turbine mixer is provided in the ion exchange membrane. The turbine mixer is used to mix the saline solution in the cathode electrolytic cell and the anode electrolytic cell.

[0012] Furthermore, a chloride ion concentration sensor is provided in each of the cathode electrolytic cell and the anode electrolytic cell.

[0013] Furthermore, the buffer chamber is provided with a heating device corresponding to the modified adsorbent, and the buffer chamber is also provided with a first carbon dioxide concentration sensor, a first air inlet and an air outlet; the air outlet is also provided with a first one-way valve.

[0014] Furthermore, a second carbon dioxide concentration sensor and a second air inlet are provided in the drawer body; and the drawer body is connected to the buffer chamber through a first pipe, and a second one-way valve is provided in the first pipe.

[0015] Furthermore, the buffer chamber is connected to the cathode electrolytic cell through a second pipe, a third one-way valve is provided in the second pipe, and a portion of the second pipe connected to the cathode electrolytic cell is completely extended into the brine.

[0016] Furthermore, an ultraviolet light source is provided on the top of the illumination reaction chamber, and a first air inlet and a second air inlet are provided on the upper part of the illumination reaction chamber;

[0017] The first air inlet is connected to the cathode electrolytic cell through a third pipeline, and a fourth one-way valve is provided in the third pipeline;

[0018] The second air inlet is connected to the anode electrolytic cell through a fourth pipeline, and a fifth one-way valve is provided in the fourth pipeline;

[0019] The third pipe and the fourth pipe do not extend into the saline solution.

[0020] Furthermore, a gas outlet is provided at the lower part of the illumination reaction chamber, and the gas outlet is communicated with the cathode electrolytic cell through a fifth pipe. A first flow metering valve is provided in the fifth pipe, and a portion of the fifth pipe connected to the cathode electrolytic cell is completely extended into the brine.

[0021] Furthermore, the cathode electrolytic cell is connected to the drawer body through a sixth pipe, a sixth one-way valve is provided in the sixth pipe, and the sixth pipe does not extend into the brine.

[0022] Furthermore, a second flow metering valve is also provided in the sixth pipeline, and the second flow metering valve is located on a side of the sixth one-way valve connected to the drawer body.

[0023] The present invention also provides a refrigerator, comprising the above-mentioned fresh-keeping drawer.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention realizes the adsorption-desorption of carbon dioxide without consumables and at normal pressure by combining a self-circulating chemical absorption system constructed by electrolyzing salt water with a modified adsorbent, which is equivalent to combining a physical adsorption method with a chemical absorption method to maintain the carbon dioxide concentration in the drawer body, achieve an appropriate and stable carbon dioxide concentration in the drawer body, solve the problem of carbon dioxide metabolic acidosis in the fruit and vegetable preservation process, and comprehensively achieve an appropriate and stable carbon dioxide concentration to regulate the internal physiological and biochemical reactions of fruits and vegetables, so that fruits and vegetables can be preserved for a longer time and with higher quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a schematic diagram of the composition of the fresh-keeping drawer proposed by the present invention;

[0029] Figure 2 A schematic diagram of the structure of the refrigerator proposed by the present invention;

[0030] Figure 3 This is a schematic diagram of the first process flow of the fresh-keeping drawer proposed by the present invention;

[0031] Figure 4 A second flow chart of the fresh-keeping drawer proposed by the present invention;

[0032] Figure 5 A third flow chart of the fresh-keeping drawer proposed by the present invention;

[0033] Figure 6 This is a fourth flow chart of the fresh-keeping drawer proposed by the present invention.

[0034] Reference numerals:

[0035] 10. Drawer body;

[0036] 101. second carbon dioxide concentration sensor; 102. second air inlet; 103. first pipeline; 104. second one-way valve;

[0037] 20. Buffer room;

[0038] 201, modified adsorbent; 202, first carbon dioxide concentration sensor; 203, first air inlet; 204, air outlet; 205, first one-way valve; 206, second pipeline; 207, third one-way valve;

[0039] 30. Electrolyzer;

[0040] 301, ion exchange membrane; 302, cathode electrolytic cell; 303, anode electrolytic cell; 304, pH sensor; 305, turbine mixer; 306, chloride ion concentration sensor; 307, sixth pipeline; 308, sixth one-way valve; 309, second flow metering valve; 310, cathode electrolytic rod; 311, anode electrolytic rod;

[0041] 40. Light reaction chamber;

[0042] 401, ultraviolet light source; 402, first air inlet; 403, second air inlet; 404, third pipeline; 405, fourth one-way valve; 406, fourth pipeline; 407, fifth one-way valve; 408, air outlet; 409, fifth pipeline; 410, first flow metering valve. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0044] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0045] Example 1

[0046] See attached Figure 1 The present invention provides a fresh-keeping drawer capable of rapid regulation of carbon dioxide by combining physical adsorption and chemical absorption and operating at normal pressure, comprising a drawer body 10; the fresh-keeping drawer also comprises:

[0047] A buffer chamber 20, in which a modified adsorbent 201 is disposed, the buffer chamber 20 is communicated with the drawer body 10, and the modified adsorbent 201 is used to adsorb carbon dioxide and desorb carbon dioxide by heating;

[0048] The electrolytic cell 30 has salt water therein and forms a cathode electrolytic cell 302 and an anode electrolytic cell 303 through an ion exchange membrane 301, wherein the cathode electrolytic cell 302 is communicated with the buffer chamber 20 and the drawer body 10 respectively;

[0049] The light irradiation reaction chamber 40 has an air inlet which is communicated with the cathode electrolytic cell 302 and the anode electrolytic cell 303 respectively, and an air outlet 408 which is communicated with the cathode electrolytic cell 302 .

[0050] It should be noted that the fresh-keeping drawer proposed in this embodiment is also provided with a main control unit (not shown, the same as in the whole text), and the buffer chamber 20 is provided with a heating device corresponding to the modified adsorbent 201, and the main control unit is electrically connected to the electrolytic cell 30, the light irradiation reaction chamber 40 and the heating device respectively. In this embodiment, the salt water before electrolysis is preferably saturated salt water, so that the electrolysis efficiency of the electrolytic cell 30 is higher.

[0051] In this way, when fruits and vegetables are placed in the drawer body 10 for preservation, if the carbon dioxide concentration in the drawer body 10 is too high, the carbon dioxide in the drawer body 10 can be transported to the buffer chamber 20, so that the modified adsorbent 201 can adsorb carbon dioxide to reduce the carbon dioxide concentration in the drawer body 10. Carbon dioxide can also be adsorbed in the buffer chamber 20 to achieve carbon dioxide enrichment; when the carbon dioxide concentration in the drawer body 10 is too low, the main control unit first energizes the electrolytic cell 30, causing the salt water in the cathode electrolytic cell 302 to electrolyze and generate hydroxide ions (OH - ) and hydrogen (H2), the salt water in the anode electrolyzer 303 is electrolyzed to generate chlorine (Cl2), that is, the cathode electrolyzer 302 forms a strong alkaline environment, and then the modified adsorbent 201 in the buffer chamber 20 desorbs carbon dioxide by heating and transports it to the cathode electrolyzer 302, so that the hydroxide ions in the cathode electrolyzer 302 absorb carbon dioxide to form carbonate ions. Then the cathode electrolyzer 302 and the anode electrolyzer 303 respectively transport hydrogen and chlorine to the illumination reaction chamber 40, and then the main control unit starts the illumination reaction chamber 40, so that the illumination reaction chamber 40 emits photocatalytic hydrogen and chlorine to react to form hydrogen chloride gas, and then the illumination reaction chamber 40 transports the generated hydrogen chloride gas to the cathode electrolyzer 302, causing the cathode electrolyzer 302 to regenerate salt water and carbon dioxide gas, and then the carbon dioxide gas is transported to the drawer body 10 to maintain the carbon dioxide concentration in the drawer body 10, so as to achieve a suitable and stable carbon dioxide concentration in the drawer body 10.

[0052] Therefore, the present invention combines physical adsorption with chemical absorption, that is, a self-circulating chemical absorption system constructed by electrolyzing salt water cooperates with a modified adsorbent 201 to achieve non-consumable, normal-pressure adsorption-desorption of carbon dioxide, so as to maintain the carbon dioxide concentration in the drawer body 10, achieve an appropriate and stable carbon dioxide concentration in the drawer body 10, solve the problem of carbon dioxide metabolic acidosis in the fruit and vegetable preservation process, and comprehensively achieve an appropriate and stable carbon dioxide concentration to regulate the intrinsic physiological and biochemical reactions of fruits and vegetables, so that fruits and vegetables can be preserved for a longer time and with higher quality.

[0053] Among them, refer to the attached Figure 1 The drawer body 10 is provided with a second carbon dioxide concentration sensor 101 and a second air inlet 102 ; and the drawer body 10 is communicated with the buffer chamber 20 through a first pipe 103 , and the first pipe 103 is provided with a second one-way valve 104 .

[0054] It should be noted that a second exhaust fan (not shown, the same throughout) is provided corresponding to the second air inlet 102 to draw outside air into the drawer body 10, and the second exhaust fan, the second carbon dioxide concentration sensor 101 and the second one-way valve 104 are all connected to the main control unit.

[0055] In this way, the main control unit can accurately know the carbon dioxide concentration in the drawer body 10 according to the second carbon dioxide concentration sensor 101. If the carbon dioxide concentration in the drawer body 10 is too high, the main control unit will start the second exhaust fan to draw outside air into the drawer body 10 to dilute the concentration of carbon dioxide. At the same time, the main control unit will also open the second one-way valve 104 to transport the carbon dioxide concentration in the drawer body 10 to the buffer chamber 20, further diluting the carbon dioxide concentration in the drawer body 10, and the modified adsorbent 201 can also adsorb carbon dioxide at a lower temperature to achieve carbon dioxide enrichment, thereby reducing the time spent on the next carbon dioxide enrichment adsorption.

[0056] Among them, refer to the attached Figure 1 The buffer chamber 20 is provided with a heating device (not shown, the same as in the whole text) corresponding to the modified adsorbent 201, and a first carbon dioxide concentration sensor 202, a first air inlet 203 and an air outlet 204 are also provided in the buffer chamber 20; the air outlet 204 is also provided with a first one-way valve 205.

[0057] It should be noted that a first exhaust fan (not shown, the same throughout) is provided corresponding to the first air inlet 203 to draw outside air into the buffer chamber 20, and the first exhaust fan, the first carbon dioxide concentration sensor 202 and the first one-way valve 205 are all connected to the main control unit.

[0058] In this way, in order to make the buffer chamber 20 more efficiently enrich carbon dioxide under the condition of lower temperature, the main control unit will start the first exhaust fan to draw the outside air into the buffer chamber 20, so that the modified adsorbent 201 adsorbs carbon dioxide in the air to achieve carbon dioxide enrichment, and then the main control unit opens the first one-way valve 205 to discharge the air after the adsorption of carbon dioxide through the air outlet 204 to prevent the subsequent steps from being affected. When the modified adsorbent 201 needs to desorb carbon dioxide, the main control unit starts the heating device to increase the ambient temperature of the modified adsorbent 201 to 30°C-50°C so that the modified adsorbent 201 can desorb carbon dioxide.

[0059] Among them, the modified adsorbent 201 is preferably an amino-modified activated alumina carrier; because the amino-modified activated alumina carrier can desorb carbon dioxide at 30°C-50°C, and the amino-modified activated alumina carrier interacts with carbon dioxide through its own chemical adsorption mechanism to form weaker chemical bonds, which are easy to break at lower temperatures, thereby achieving the desorption of carbon dioxide.

[0060] Compared with other materials with similar functions, such as metal organic frameworks (MOFs) and amine anion exchange resins, which require temperatures of 100°C or above to desorb adsorbed carbon dioxide, the amino-modified activated alumina carrier proposed in the present invention can achieve carbon dioxide desorption at a lower temperature, reducing energy loss.

[0061] Among them, refer to the attached Figure 1 A pH sensor 304 is also provided at the bottom of the cathode electrolytic cell 302 , and a turbine mixer 305 is also provided at the lower part of the ion exchange membrane 301 . The turbine mixer 305 is used to mix the saline solution in the cathode electrolytic cell 302 and the anode electrolytic cell 303 .

[0062] It should be noted that the pH sensor 304 and the turbine mixer 305 are both electrically connected to the main control unit.

[0063] In this way, when the saline solution in the cathode electrolytic cell 302 is powered on for electrolysis, the main control unit can detect the pH value pi in the cathode electrolytic cell 302 in real time through the pH sensor 304. If pi ≥ 13.0 is detected, it indicates that the cathode electrolytic cell 302 has formed a strong alkaline environment at this time, and the main control unit stops powering the saline solution in the cathode electrolytic cell 302. And because the saline solution in the cathode electrolytic cell 302 generates hydrogen by electrolysis, resulting in a lack of hydrogen ions in the cathode electrolytic cell 302, and the saline solution in the anode electrolytic cell 303 generates chlorine by electrolysis, resulting in a lack of chloride ions in the anode electrolytic cell 303, so in order to keep the cathode electrolytic cell 302 and the anode electrolytic cell 303 being able to continue electrolysis, the main control unit needs to start the turbine mixer 305 every once in a while to mix the saline solutions in the cathode electrolytic cell 302 and the anode electrolytic cell 303, so that the chloride ion concentrations in the cathode electrolytic cell 302 and the anode electrolytic cell 303 will not differ too much.

[0064] It should be noted that a cathode electrolysis rod 310 is provided in the cathode electrolysis cell 302, and the cathode electrolysis rod 310 is used to electrolyze the brine in the cathode electrolysis cell 302; similarly, an anode electrolysis rod 311 is provided in the anode electrolysis cell 303, and the anode electrolysis rod 311 is used to electrolyze the brine in the anode electrolysis cell 303; and the cathode electrolysis rod 310 and the anode electrolysis rod 311 are both electrically connected to the main control unit.

[0065] In order to further clarify the chloride ion concentration in the cathode electrolytic cell 302 and the anode electrolytic cell 303 and reduce the power loss of starting the turbine mixer 305, refer to the attached Figure 1 A chloride ion concentration sensor 306 is respectively provided at the lower part of the cathode electrolytic cell 302 and the lower part of the anode electrolytic cell 303 .

[0066] It should be noted that the two chloride ion concentration sensors 306 are both electrically connected to the main control unit.

[0067] Thus, when the main control unit detects through the two chloride ion concentration sensors 306 that the difference ΔC between the chloride ion concentrations in the cathode electrolytic cell 302 and the anode electrolytic cell 303 is lower than 0.1%, the main control unit turns off the turbine mixer 305 to reduce the power loss of starting the turbine mixer 305 .

[0068] In order to make the carbon dioxide desorbed by the modified adsorbent 201 in the buffer chamber 20 react with the hydroxide ions in the cathode electrolyzer 302 to form carbonate ions better and more efficiently, Figure 1 The buffer chamber 20 is connected to the cathode electrolytic cell 302 through a second pipe 206. A third one-way valve 207 is provided in the second pipe 206, and a portion of the second pipe 206 connected to the cathode electrolytic cell 302 is completely extended into the salt water.

[0069] It should be noted that the third one-way valve 207 is electrically connected to the main control unit.

[0070] In this way, when the carbon dioxide in the buffer chamber 20 needs to be transported to the cathode electrolysis cell 302 , the main control unit will open the third one-way valve 207 .

[0071] In order to make the hydrogen and chlorine in the photoreaction chamber 40 react faster to generate hydrogen chloride gas, refer to the attached Figure 1 A UV light source 401 is disposed on the top of the illumination reaction chamber 40 .

[0072] It should be noted that the ultraviolet light source 401 is electrically connected to the main control unit.

[0073] Specifically, refer to the attached Figure 1 The upper part of the illumination reaction chamber 40 is provided with a first air inlet 402 and a second air inlet 403 arranged vertically;

[0074] The first air inlet 402 is connected to the cathode electrolytic cell 302 through a third pipe 404, and a fourth one-way valve 405 is provided in the third pipe 404;

[0075] The second air inlet 403 is connected to the anode electrolytic cell 303 through a fourth pipe 406, and a fifth one-way valve 407 is provided in the fourth pipe 406;

[0076] The third pipe 404 and the fourth pipe 406 do not extend into the saline solution.

[0077] It should be noted that the fourth one-way valve 405 and the fifth one-way valve 407 are both electrically connected to the main control unit.

[0078] In this way, when the main control unit opens the fourth one-way valve 405 and the fifth one-way valve 407, the hydrogen generated by the electrolysis of the saline water in the cathode electrolytic cell 302 will be transported to the illumination reaction chamber 40 through the third pipe 404. Similarly, the chlorine generated by the electrolysis of the saline water in the anode electrolytic cell 303 will be transported to the illumination reaction chamber 40 through the fourth pipe 406. Then the main control unit turns on the ultraviolet light source 401 to catalyze the reaction of hydrogen and chlorine to generate hydrogen chloride gas for subsequent steps.

[0079] Specifically, refer to the attached Figure 1 A gas outlet 408 is provided at the lower portion of the light irradiation reaction chamber 40, and the gas outlet 408 is communicated with the cathode electrolytic cell 302 through a fifth pipe 409. A first flow metering valve 410 is provided in the fifth pipe 409, and a portion of the fifth pipe 409 connected to the cathode electrolytic cell 302 is completely extended into the brine.

[0080] It should be noted that the first flow metering valve 410 is electrically connected to the main control unit.

[0081] Since the gas density of hydrogen and chlorine is less than that of hydrogen chloride, the generated hydrogen chloride gas will sink to the bottom of the photoreaction chamber 40. Then the main control unit opens the first flow metering valve 410 to allow the hydrogen chloride gas to be transported to the cathode electrolytic cell 302 through the fifth pipeline 409, so that the hydrogen chloride gas reacts with the carbonate ions in the cathode electrolytic cell 302 to regenerate carbon dioxide and salt water.

[0082] In order to ensure that the hydrogen chloride gas can react with the carbonate ions in the cathode electrolytic cell 302 faster and more efficiently, the portion of the fifth pipe 409 connected to the cathode electrolytic cell 302 is completely extended into the salt water.

[0083] Among them, refer to the attached Figure 1 The cathode electrolytic cell 302 is connected to the drawer body 10 through a sixth pipe 307, a sixth one-way valve 308 is provided in the sixth pipe 307, and the sixth pipe 307 does not extend into the saline solution.

[0084] It should be noted that the sixth one-way valve 308 is electrically connected to the main control unit.

[0085] In this way, the main control unit opens the sixth one-way valve 308 so that the carbon dioxide regenerated by the cathode electrolytic cell 302 can be transported to the drawer body 10 .

[0086] Furthermore, a second flow metering valve 309 is further disposed in the sixth pipeline 307 , and the second flow metering valve 309 is located at a side of the sixth one-way valve 308 connected to the drawer body 10 .

[0087] It should be noted that the sixth one-way valve 308 is connected to the main control unit.

[0088] In this way, the main control unit opens the sixth one-way valve 308 and the second flow metering valve 309 at the same time to further ensure that the carbon dioxide regenerated by the cathode electrolyzer 302 can be delivered to the drawer body 10 and prevent the cathode electrolyzer 302 from delivering too much carbon dioxide to the drawer body 10.

[0089] Example 2

[0090] See attached Figure 1-2 The present invention also provides a refrigerator, comprising the above-mentioned fresh-keeping drawer.

[0091] Therefore, the refrigerator proposed in the present invention can combine the physical adsorption method with the chemical absorption method, that is, the self-circulating chemical absorption system constructed by electrolyzing salt water cooperates with the amino-modified activated alumina carrier to realize the adsorption-desorption of carbon dioxide without consumables and at normal pressure, so as to maintain the carbon dioxide concentration in the fresh-keeping drawer, realize the appropriate and stable carbon dioxide concentration in the fresh-keeping drawer, solve the problem of carbon dioxide metabolic acidosis in the process of fruit and vegetable preservation, and comprehensively realize the appropriate and stable carbon dioxide concentration to regulate the intrinsic physiological and biochemical reactions of fruits and vegetables, so as to keep fruits and vegetables fresh for a longer time and with higher quality.

[0092] The use process of the refrigerator proposed by the present invention is as follows:

[0093] See attached Figure 3 , the adsorption stage of carbon dioxide:

[0094] The refrigerator is powered on and started, and the evaporator of the freezer compartment in the refrigerator is also powered on and started, and the refrigeration system is turned on. At this time, the main control unit starts the first exhaust fan, and the first exhaust fan extracts the outside air and delivers it to the buffer chamber 20 at a first preset flow rate V1, so that the modified adsorbent 201 adsorbs the carbon dioxide in the air to achieve carbon dioxide enrichment. Then the main control unit detects and records the carbon dioxide concentration C1 in the buffer chamber 20 through the first carbon dioxide concentration sensor 202. When C1≤0.005%, the first exhaust fan is continuously controlled to exhaust the outside air at the first preset flow rate V1; when C1>0.005%, the first exhaust fan is turned off and the air intake is stopped.

[0095] The purpose of the carbon dioxide adsorption stage is to adsorb carbon dioxide in the air through the modified adsorbent 201 .

[0096] See attached Figure 4 , Carbon dioxide absorption stage:

[0097] The main control unit conducts electrolysis of the saline solution in the electrolytic cell 30 by energizing. At this time, the saturated saline solution in the cathode electrolytic cell 302 is electrolyzed to generate hydroxide ions and hydrogen, and the saturated saline solution in the anode electrolytic cell 303 is electrolyzed to generate chlorine, and then the fourth one-way valve 405 and the fifth one-way valve 407 are opened. Then, the main control unit detects the pH value pi of the cathode electrolytic cell 302 through the pH sensor 304 at intervals of the first preset time T1. When Pi ≥ 13.0, the main control unit stops energizing the saline solution in the electrolytic cell 30 and closes the fourth one-way valve 405 and the fifth one-way valve 407; if pi < 13.0, the main control unit continues to energize the saline solution in the electrolytic cell 30 for electrolysis, and the fourth one-way valve 405 and the fifth one-way valve 407 remain open.

[0098] Then the main control unit starts the heating device to make the modified adsorbent 201 desorb carbon dioxide. At the same time, the main control unit opens the third one-way valve 207 to make the carbon dioxide be absorbed by the hydroxide ions in the cathode electrolyzer 302 .

[0099] The purpose of the carbon dioxide absorption stage is: to electrolyze the saturated salt water in the cathode electrolytic cell 302, resulting in a large reduction of hydrogen ions in the cathode electrolytic cell 302, thereby promoting the dissociation of water molecules, resulting in the accumulation of a large number of hydroxide ions in the cathode electrolytic cell 302, thereby forming a strong alkaline environment in the cathode electrolytic cell 302, and then the carbon dioxide desorbed by the modified adsorbent 201 is passed into the cathode electrolytic cell 302 to be absorbed, that is, the carbon dioxide reacts with the hydroxide ions to generate carbonate ions.

[0100] See attached Figure 5 , Carbon dioxide re-release stage:

[0101] After the heating device heats for the second preset time T2, the main control unit turns off the heating device and the third one-way valve 207, and then the main control unit starts the ultraviolet light source 401 to emit ultraviolet light, and then catalyzes the reaction of chlorine and hydrogen in the illumination reaction chamber 40 to generate hydrogen chloride gas. Then after the third preset time T3, the main control unit opens the first flow metering valve 410 to transport the hydrogen chloride gas in the illumination reaction chamber 40 to the cathode electrolyzer 302, causing the hydrogen chloride gas to react with the carbonate ions in the cathode electrolyzer 302 to regenerate carbon dioxide and salt water. At this time, the main control unit opens the sixth one-way valve 308 and the second flow metering valve 309 to transport the carbon dioxide regenerated in the cathode electrolyzer 302 to the drawer body 10, so as to complete the establishment of the preset carbon dioxide gas conditioning concentration C2.

[0102] It should be noted that the preset carbon dioxide concentration C2 is the most suitable carbon dioxide concentration for preserving fruits and vegetables.

[0103] At the same time, the main control unit will also start the turbine mixer 305 to mix the brine in the cathode electrolytic cell 302 and the anode electrolytic cell 303. When the main control unit detects through the two chloride ion concentration sensors 306 that the difference ΔC in the chloride ion concentration in the cathode electrolytic cell 302 and the anode electrolytic cell 303 is less than 0.1%, the main control unit will turn off the turbine mixer 305; otherwise, the main control unit continues to run the turbine mixer 305.

[0104] The purpose of the carbon dioxide re-releasing stage is to form hydrogen chloride gas with chlorine and hydrogen produced by ultraviolet catalytic electrolysis, and then transport the hydrogen chloride to the cathode electrolytic cell 302 to decompose carbonate ions and release carbon dioxide gas, which is used to establish a carbon dioxide atmosphere in the fresh-keeping compartment. At the same time, since chloride ions are continuously lost in the anode electrolytic cell 303 and hydrogen chloride regenerates chloride ions from the cathode electrolytic cell 302, a turbine mixer 305 is used to mix the liquids in the cathode electrolytic cell 302 and the anode electrolytic cell 303 to ensure uniform distribution of chloride ions and prevent the electrolyte (equivalent to salt water) in the electrolytic cell 30 from failing after long-term use, thereby ensuring the continued effectiveness of the electrolysis process and the regeneration capacity of the electrolyte.

[0105] See attached Figure 6 , Fruit and vegetable storage stage:

[0106] The main control unit detects the carbon dioxide concentration in the drawer body 10 through the second carbon dioxide concentration sensor 101 at every fourth preset time interval T4. If the detected carbon dioxide concentration C3 ≥ C2 + 1%, the main control unit starts the second exhaust fan and opens the second one-way valve 104. The second exhaust fan draws external air and delivers it to the drawer body 10 at a second preset flow rate V2. The carbon dioxide delivered to the buffer chamber 20 by the drawer body 10 can also help the modified adsorbent 201 to adsorb carbon dioxide at a lower temperature to achieve carbon dioxide enrichment.

[0107] When C3≤C2-1%, the main control unit turns off the second exhaust fan and the second one-way valve 104 to preserve the fruits and vegetables placed in the fresh-keeping room for a longer time and with higher quality.

[0108] The purpose of the reciprocating cycle fruit and vegetable storage stage is that when fruits and vegetables are stored for a long time, more carbon dioxide gas will be generated due to respiration. Therefore, the carbon dioxide concentration in the drawer body 10 is regularly detected. When the carbon dioxide concentration is too high, new air is introduced to dilute the carbon dioxide concentration in the drawer body 10. At the same time, the air rich in carbon dioxide is transported to the buffer chamber 20 so that the modified adsorbent 201 can adsorb it, thereby reducing the time consumption of the next carbon dioxide enrichment adsorption.

[0109] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A fresh-keeping drawer, comprising a drawer body (10), characterized in that: The fresh-keeping drawer also includes: A buffer chamber (20) in which a modified adsorbent (201) is arranged, the buffer chamber (20) is in communication with the drawer body (10), and the modified adsorbent (201) is used to adsorb carbon dioxide and desorb the carbon dioxide by heating; An electrolytic cell (30) containing saline solution and forming a cathode electrolytic cell (302) and an anode electrolytic cell (303) through an ion exchange membrane (301), wherein the cathode electrolytic cell (302) is communicated with the buffer chamber (20) and the drawer body (10) respectively; The light irradiation reaction chamber (40) has an air inlet which is respectively connected to the cathode electrolytic cell (302) and the anode electrolytic cell (303), and an air outlet (408) which is connected to the cathode electrolytic cell (302).

2. The fresh-keeping drawer according to claim 1, characterized in that: The cathode electrolytic cell (302) is also provided with a pH sensor (304), and the ion exchange membrane (301) is also provided with a turbine mixer (305), and the turbine mixer (305) is used to mix the saline solution in the cathode electrolytic cell (302) and the anode electrolytic cell (303).

3. The fresh-keeping drawer according to claim 1, characterized in that: The cathode electrolytic cell (302) and the anode electrolytic cell (303) are each provided with a chloride ion concentration sensor (306).

4. The fresh-keeping drawer according to claim 1, characterized in that: The buffer chamber (20) is provided with a heating device corresponding to the modified adsorbent (201), and a first carbon dioxide concentration sensor (202), a first air inlet (203) and an air outlet (204) are also provided in the buffer chamber (20); the air outlet (204) is also provided with a first one-way valve (205).

5. The fresh-keeping drawer according to claim 1, characterized in that: A second carbon dioxide concentration sensor (101) and a second air inlet (102) are provided in the drawer body (10); and the drawer body (10) is in communication with the buffer chamber (20) via a first pipe (103); a second one-way valve (104) is provided in the first pipe (103).

6. The fresh-keeping drawer according to claim 1, characterized in that: The buffer chamber (20) is connected to the cathode electrolytic cell (302) via a second pipe (206), a third one-way valve (207) is provided in the second pipe (206), and a portion of the second pipe (206) connected to the cathode electrolytic cell (302) is completely extended into the salt water.

7. The fresh-keeping drawer according to claim 1, characterized in that: The upper portion of the illumination reaction chamber (40) is provided with a first air inlet (402) and a second air inlet (403); The first air inlet (402) is connected to the cathode electrolytic cell (302) through a third pipeline (404), and a fourth one-way valve (405) is provided in the third pipeline (404); The second air inlet (403) is connected to the anode electrolytic cell (303) via a fourth pipe (406), and a fifth one-way valve (407) is provided in the fourth pipe (406); The third pipe (404) and the fourth pipe (406) do not extend into the saline solution.

8. The fresh-keeping drawer according to claim 1, characterized in that: An ultraviolet light source (401) is disposed at the top of the illumination reaction chamber (40), and an air outlet (408) is disposed at the bottom of the illumination reaction chamber (40). The air outlet (408) is communicated with the cathode electrolytic cell (302) through a fifth pipe (409), a first flow metering valve (410) is disposed in the fifth pipe (409), and a portion of the fifth pipe (409) communicating with the cathode electrolytic cell (302) is completely extended into the saline solution.

9. The fresh-keeping drawer according to claim 1, characterized in that: The cathode electrolytic cell (302) is in communication with the drawer body (10) via a sixth pipe (307), a sixth one-way valve (308) is provided in the sixth pipe (307), and the sixth pipe (307) does not extend into the saline solution.

10. The fresh-keeping drawer according to claim 9, characterized in that: A second flow metering valve (309) is also provided in the sixth pipeline (307), and the second flow metering valve (309) is located on the side of the sixth one-way valve (308) connected to the drawer body (10).

11. A refrigerator, characterized in that The fresh-keeping drawer comprises the fresh-keeping drawer according to any one of claims 1 to 10.

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