Refrigerator

Abstract

The utility model discloses a refrigerator, which comprises a shell, a refrigerating chamber and / or a freezing chamber arranged in the shell, a sterilization module arranged in the refrigerating chamber and / or the freezing chamber, and a ventilation system provided with a plurality of air ducts and used for communicating the refrigerating chamber and / or the freezing chamber with the outside of the shell, and the content of nitrogen and oxygen in the refrigerating chamber and / or the freezing chamber can be controlled by switching the air ducts through which the airflow flows. According to the refrigerator, due to the fact that the ventilation system is arranged, external fresh air can be introduced into the refrigerating chamber and / or the freezing chamber, air containing germs and peculiar smells can be exhausted out of the refrigerator, and the purpose of purifying system air is achieved. The air exchange system is provided with a plurality of air channels, different air channels can penetrate through different air components, the nitrogen and oxygen content in the refrigerating chamber and / or the freezing chamber is controlled by switching the air channels through which airflow flows, the corresponding nitrogen and oxygen content can be adjusted for the sterilization module in different sterilization stages, and the reliability and stability of the sterilization function are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigerators. Background Art

[0002] In modern life, refrigerators have become a must-have electrical appliance for families. However, the refrigerator is prone to odor due to the storage of various ingredients. The refrigerator is a closed space with poor airflow and odor cannot be discharged. In addition, the temperature of the refrigerator compartment is prone to the growth of bacteria such as Listeria and E. coli. This not only affects the storage quality of ingredients, but also poses a potential threat to human health.

[0003] The currently used refrigerator sterilization technologies mainly include photocatalyst sterilization technology, herbal essence sterilization, plasma sterilization technology, ultraviolet sterilization, silver ion sterilization, etc.

[0004] The technical principles of silver ion and ultraviolet sterilization are simple, but they cannot actively sterilize. They need direct contact with harmful substances to trigger their effects. When obstruction occurs, the sterilization effect will be seriously affected.

[0005] Photocatalytic technology uses ultraviolet rays to irradiate the catalyst, which will generate O with strong oxidizing ability. 2 - (superoxide radical) and OH - (Hydroxy free radicals). When organic matter contacts the surface of the photocatalyst, these unstable substances (superoxide anion free radicals and hydroxyl free radicals) will undergo redox reactions with the organic matter, and finally react to generate carbon dioxide (CO 2 ) and water (H 2 O). This method is not restricted by shielding and has a certain sterilization effect on floating bacteria in the refrigerator. Since the sterilization ability is affected by factors such as oxygen in the refrigerator, and the air content is uncontrollable due to the closed inside of the refrigerator, there is a technical problem of unstable sterilization effect.

[0006] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] The utility model aims at the technical problem that the content of air components in the prior art refrigerators cannot be controlled and the sterilization effect is unstable due to the closed interior when sterilizing, and proposes a refrigerator that can solve the above problem.

[0008] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0009] A refrigerator, comprising a housing, a refrigerating chamber and / or a freezing chamber arranged in the housing, wherein a sterilizing module is arranged in the refrigerating chamber and / or the freezing chamber, and further comprising:

[0010] A ventilation system has a plurality of air ducts for connecting the refrigerating chamber and / or freezing chamber with the outside of the shell, and is capable of switching the air ducts through which the air flows to control the nitrogen and oxygen content in the refrigerating chamber and / or freezing chamber.

[0011] In some embodiments, the housing is provided with a fresh air inlet and an exhaust port, the refrigerating chamber and / or the freezing chamber is provided with an air inlet, a first air outlet, and a second air outlet, an oxygen-enriched membrane is provided at the second air outlet, and the ventilation system comprises:

[0012] An air intake duct connected between the fresh air inlet and the air inlet;

[0013] an exhaust air duct, a second end of which is connected to the exhaust port;

[0014] A first exhaust branch connected between the first air outlet and the first end of the exhaust air duct, wherein a first solenoid valve is disposed in the first exhaust branch;

[0015] The second exhaust branch is connected between the second air outlet and the first end of the exhaust air duct, and a second solenoid valve is arranged in the second exhaust branch.

[0016] In some embodiments, the ventilation system further comprises:

[0017] An air pump is arranged between the air inlet duct and the fresh air inlet or between the exhaust duct and the exhaust port, and is used to drive external air into the refrigerating chamber and / or freezing chamber and discharge it from the exhaust port after ventilation.

[0018] In some embodiments, a HPEA filter is further provided at the first end of the exhaust air duct.

[0019] In some embodiments, the refrigerator further comprises:

[0020] A connection module is formed with a connection cavity inside thereof. The connection module has connection ports corresponding to the exhaust air duct, the first exhaust branch and the second exhaust branch respectively, and each connection port is connected to the connection cavity respectively.

[0021] In some embodiments, the HPEA filter is disposed in the connecting cavity at a position close to the first end of the exhaust air duct.

[0022] In some embodiments, a third solenoid valve is provided in the air intake duct;

[0023] The refrigerating chambers have a plurality of air inlets connected in parallel, the first air outlets of the plurality of refrigerating chambers are connected in parallel, and the second air outlets of the plurality of refrigerating chambers are connected in parallel.

[0024] In some embodiments, the sterilization module includes:

[0025] A catalyst carrier, which is arranged in the refrigerating chamber and / or freezing chamber, and has a catalyst coating on the catalyst carrier;

[0026] The ultraviolet lamp is connected to the control module and is turned on or off under the control of the control module.

[0027] In some embodiments, the catalyst carrier is a glass plate, and there are at least two catalyst carriers, which are respectively located above and below the ultraviolet lamp.

[0028] In some embodiments, a filter is provided at the fresh air inlet.

[0029] Compared with the prior art, the advantages and positive effects of the utility model are:

[0030] The refrigerator of the utility model is provided with a ventilation system for connecting the refrigerating chamber and / or freezing chamber with the outside of the shell, so as to introduce fresh air from outside into the refrigerating chamber and / or freezing chamber, and discharge air containing germs and odors to the outside of the refrigerator, so as to achieve the purpose of purifying the air in the system. The ventilation system has multiple air ducts, and different air ducts can pass different air components. By switching the air ducts through which the air flows, the nitrogen and oxygen content in the refrigerating chamber and / or freezing chamber is controlled, and the corresponding nitrogen and oxygen content can be adjusted for the sterilization module at different sterilization stages, thereby ensuring the reliability and stability of the sterilization function.

[0031] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a structural schematic diagram of an embodiment of a refrigerator proposed by the utility model;

[0034] Figure 2 yes Figure 1 Schematic diagram of the ventilation system connection of the refrigerator;

[0035] Figure 3 It is a structural schematic diagram of another embodiment of the refrigerator proposed by the utility model;

[0036] Figure 4 yes Figure 3 Schematic diagram of the ventilation system connection of the refrigerator;

[0037] Figure 5 It is a schematic diagram of a sterilization module in an embodiment of a refrigerator provided by the utility model;

[0038] Figure 6 This is a gas flow diagram of an embodiment of a refrigerator provided by the utility model;

[0039] Figure 7 The utility model discloses a gas flow diagram of another embodiment of the refrigerator. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Embodiment 1: This embodiment provides a refrigerator, such as Figure 1 As shown, the refrigerator comprises a housing 11, a refrigerating chamber 12 and / or a freezing chamber 13 disposed in the housing. Different refrigerators have different internal configurations. The refrigerator applicable to this embodiment includes but is not limited to a solution having only a refrigerating chamber 12, only a freezing chamber 13, and both a refrigerating chamber 12 and a freezing chamber 13. In addition, a solution having multiple refrigerating chambers 12 and a solution having multiple freezing chambers 13 are also included.

[0044] In order to kill harmful microorganisms in the refrigerating chamber 12 and / or the freezing chamber 13, in some embodiments, a sterilization module 14 is provided in the refrigerating chamber 12 or the freezing chamber 13, or a sterilization module 14 is provided in the refrigerating chamber 12 and the freezing chamber 13 respectively.

[0045] In some embodiments, the sterilization module 14 uses the photocatalyst principle for sterilization. The oxygen and water vapor on the surface of the photocatalyst will generate O with strong oxidizing ability under the irradiation of visible light or ultraviolet light. 2 - (superoxide anion free radical) and OH- (hydroxyl free radical). When organic matter contacts the surface of photocatalyst, these unstable substances (superoxide anion free radical and hydroxyl free radical) will undergo redox reaction with organic matter respectively, and finally react to generate carbon dioxide (CO 2 ) and water (H 2 O). The chemically unstable superoxide anion radical (O 2 -) and hydroxyl radicals (OH-) destroy the bacterial cell membrane and cause the cytoplasm to leak, thus causing the death of the bacteria. It can also solidify the protein carrier of the virus and inhibit the activity of the virus.

[0046] In some embodiments, the refrigerator also includes a ventilation system having a plurality of air ducts for connecting the refrigerating chamber 12 and / or the freezing chamber 13 with the outside of the shell 11, and capable of controlling the switching of the air ducts through which the air flows. When the air flows through different air ducts, the air composition remaining in the refrigerating chamber 12 and / or the freezing chamber 13 can be different. Therefore, the nitrogen oxygen content in the refrigerating chamber and / or the freezing chamber can be controlled by switching the air ducts through which the air flows.

[0047] In some embodiments, such as Figure 1 , Figure 2 As shown, the shell 11 is provided with a fresh air inlet 111 and an exhaust port 112 , and the refrigerating chamber 12 and / or the freezing chamber 13 is provided with an air inlet, a first air outlet and a second air outlet.

[0048] like Figure 2 As shown, in this embodiment, the refrigerating chamber 12 is taken as an example for description. The refrigerating chamber 12 is provided with an air inlet 121 , a first air outlet 122 and a second air outlet 123 .

[0049] In some embodiments, an oxygen-enriched membrane 124 is provided at the second air outlet 123. The function of the oxygen-enriched membrane 124 is to have different permeation rates for oxygen and nitrogen. That is, oxygen is easier to pass through, while nitrogen is not easy to pass through. Therefore, when the air in the cold storage room 12 is discharged from the first air outlet 122, both the oxygen and nitrogen inside can be discharged freely. When the air in the cold storage room 12 is discharged from the second air outlet 123, the nitrogen is blocked in the cold storage room 12, and the oxygen can be discharged freely, so the nitrogen content in the cold storage room 12 can be increased, and the oxygen content can be reduced accordingly.

[0050] In some embodiments, the ventilation system includes an air intake duct 151 connected between the fresh air inlet 111 and the air inlet port 121 . It can be understood that the air intake duct 151 is arranged between the shell 11 and the refrigerating chamber 12 and / or the freezing chamber 13 .

[0051] In some embodiments, the air inlet duct 151 is formed by a partition structure enclosure, or is realized by a tube with an integral structure.

[0052] In some embodiments, the ventilation system further includes an exhaust air duct 152, and a second end of the exhaust air duct 152 is connected to the exhaust port 112. It can be understood that the exhaust air duct 152 is disposed between the housing 11 and the refrigerating chamber 12 and / or the freezing chamber 13.

[0053] In some embodiments, the ventilation system further includes a first exhaust branch 153 , which is connected between the first air outlet 122 and the first end of the exhaust duct 152 , and a first solenoid valve 154 is disposed in the first exhaust branch 153 .

[0054] The refrigerator includes a control module (not shown in the figure), the first solenoid valve 154 is electrically connected to the control module, and the on-off state of the first solenoid valve 154 is controlled by the control module.

[0055] When the first solenoid valve 154 is opened, Figure 6 As shown, the first exhaust branch 153 connects the refrigerating chamber 12 with the exhaust air duct 152 through the first air outlet 122 .

[0056] In some embodiments, the ventilation system further includes a second exhaust branch 155 , which is connected between the second air outlet 123 and the first end of the exhaust duct 152 , and a second solenoid valve 156 is disposed in the second exhaust branch 155 .

[0057] The second solenoid valve 156 is electrically connected to the control module, and the on / off state of the second solenoid valve 156 is controlled by the control module.

[0058] When the second solenoid valve 156 is opened, Figure 7As shown, the second exhaust branch 155 connects the refrigerating chamber 12 with the exhaust air duct 152 through the second air outlet 123 .

[0059] In some embodiments, the ventilation system also includes an air pump 157, which is disposed between the air intake duct 151 and the fresh air inlet 111 or between the exhaust duct 152 and the exhaust port 112, and is used to drive external air into the cold storage chamber 12 through the fresh air inlet 111, and be discharged from the exhaust port 112 after ventilating the cold storage chamber 12.

[0060] In this embodiment, the air pump 157 is provided between the exhaust air duct 152 and the exhaust port 112. When the air pump 157 is turned on, the air pump 157 pumps the air in the refrigerating chamber 12 to the outside of the refrigerator through the first exhaust branch 153 or the second exhaust branch 155 and the exhaust air duct 152, and a negative pressure is formed in the refrigerating chamber 12. Under the action of the air pressure, the air outside the refrigerator enters the refrigerating chamber 12 through the fresh air inlet 111 and the air inlet duct 151.

[0061] In order to ensure the refrigeration or freezing effect in the refrigerator and prevent the cold air from being lost from the air inlet duct 151 when ventilation is not required, in some embodiments, a third solenoid valve 158 is provided in the air inlet duct 151 .

[0062] The third solenoid valve 158 is electrically connected to the control module, and the on / off state of the third solenoid valve 158 is controlled by the control module.

[0063] When the third solenoid valve 158 is opened, the air inlet duct 151 is connected to the refrigerating chamber 12, and the external air can enter the refrigerating chamber 12 for ventilation through the air inlet duct 151. Otherwise, when the third solenoid valve 158 is closed, the air inlet duct 151 is not connected to the refrigerating chamber 12, and the external air cannot enter the refrigerating chamber 12 through the air inlet duct 151.

[0064] In some embodiments, still taking the sterilization of the cold storage room 12 as an example, the working process is as follows:

[0065] Step 1: After the refrigerator is powered on, the system is initialized: all loads are turned off (the air pump is turned off, the sterilization module is turned off), the first solenoid valve 154, the second solenoid valve 156, and the third solenoid valve 158 are all closed, and the refrigerating chamber 12 is in a closed state.

[0066] Step 2: After initialization, the detection phase begins: the control module determines whether sterilization is required.

[0067] Step 3: When sterilization is required, enter the sterilization mode and perform sterilization according to the following steps:

[0068] Step 31, oxygen intake and nitrogen exhaust stage: Before executing this stage, due to the consumption of the sterilization device and the consumption of the respiration of fruit and vegetable cells and microorganisms, the oxygen content in the cold storage room 12 is low and the nitrogen content is high. The purpose of this stage is to discharge the nitrogen inside the cold storage room 12 to the outside of the refrigerator, so that the outside air can enter the cold storage room 12. In this stage, the first solenoid valve 154 is first opened, and the air pump 157 is turned on to exhaust the air in the cold storage room 12 to the outside of the refrigerator. After the set exhaust time, the first solenoid valve 154 and the air pump 157 are closed, and the third solenoid valve 158 is opened. Since the air pressure in the cold storage room 12 is low, the outside air will enter the cold storage room 12 from the fresh air inlet 111 through the air intake duct 151, so that the oxygen content in the cold storage room 12 increases.

[0069] Step 32, sterilization stage: close the third solenoid valve 158 to make the refrigerating chamber 12 airtight, and at the same time turn on the sterilization module 14. The sterilization module 14 based on the photocatalytic principle makes the oxygen and water vapor in the room produce a large amount of O with strong oxidizing ability. 2 - (superoxide ion free radical) and OH- (hydroxyl free radical) to achieve the purpose of sterilization.

[0070] Step 33, low oxygen and gas circulation promotion secondary sterilization stage: In this stage, the sterilization module 14 is closed, and the second solenoid valve 156 and the air pump 157 are opened. Since an oxygen-enriched membrane 124 is provided at the second gas outlet 123, oxygen in the refrigerating chamber 12 can pass through but nitrogen cannot, thereby reducing the oxygen content in the refrigerating chamber 12.

[0071] In addition, the air pump 157 pumps air to promote air circulation in the refrigerating chamber 12, and the indoor O 2 - (superoxide ion free radical) and OH- (hydroxyl free radical) flow better, which is conducive to further sterilization.

[0072] Step 34, antibacterial and fresh-keeping stage: close the second electromagnetic valve 156 and the air pump 157, and the system enters a low energy consumption mode. At this time, the oxygen content in the refrigerating chamber 12 is extremely low, which can inhibit the growth of bacteria and the respiration of fruit and vegetable cells, thereby achieving a fresh-keeping effect.

[0073] In order to absorb bacteria or dust floating in the cold storage room 12 or the air duct, in some embodiments, a HPEA filter 159 is further provided at the first end of the exhaust air duct 152 .

[0074] The pore size of HPEA filter 159 is only 0.1 micron, and it uses the electrostatic effect to actively capture and intercept various suspended matter. It can remove 99.99% of H1N1 influenza, E. coli and other viruses in the air in 30 minutes.

[0075] By setting the HPEA filter 159, it has the function of actively adsorbing bacteria and sterilizing.

[0076] In step 33, when the second solenoid valve 156 and the air pump 157 are opened, the HPEA filter 159 is also opened to capture and sterilize the suspended matter in the air flow passing therethrough.

[0077] In step 34, when the second solenoid valve 156 and the air pump 157 are closed, since the air no longer flows, the HPEA filter 159 is also closed, so as to achieve the purpose of reducing energy consumption.

[0078] Since microorganisms such as bacteria and viruses are more likely to breed within a certain range of temperature and humidity, in some embodiments, the refrigerator also includes a temperature sensor 19 and a humidity sensor 20, which are respectively used to detect the temperature and humidity in the refrigerating chamber 12. In step 2, the control module determines whether sterilization is needed by reading the data of the temperature sensor 19 and the humidity sensor 20, and determines whether sterilization is to be performed based on the temperature and humidity in the refrigerator.

[0079] In some embodiments, in step 1, the sterilization mode can be entered if any of the following two conditions are met, otherwise the refrigerator still works normally in the detection phase:

[0080] (1) The refrigerator door has been opened and the temperature and humidity in the refrigerator compartment have reached the set threshold.

[0081] (2) The refrigerator is powered on for the first time.

[0082] In order to improve the cleanliness of the external air entering the refrigerator, in some embodiments, a filter 16 is provided at the fresh air inlet 111. In step 31, the clean air from the outside filtered by the filter 16 enters the refrigerating chamber 12.

[0083] In some embodiments, the filter 16 may be implemented by, but not limited to, an activated carbon filter.

[0084] In order to facilitate the connection of the first exhaust branch 153 and the second exhaust branch 155 to the exhaust duct 152 respectively, in some embodiments, the refrigerator also includes a connecting module 17, and a connecting cavity is formed inside the connecting module 17. The connecting module 17 has connecting ports corresponding to the exhaust duct 152, the first exhaust branch 153, and the second exhaust branch 155 respectively, and each connecting port is connected to the connecting cavity respectively.

[0085] In some embodiments, in order to facilitate the fixed installation of the HPEA filter 159, the HPEA filter 159 is arranged in the connecting cavity at a position close to the first end of the exhaust air duct 152.

[0086] In some embodiments, there are multiple refrigerating chambers, and the air inlets of the multiple refrigerating chambers are connected in parallel.

[0087] like Figure 3 , Figure 4As shown, the refrigerator is taken as an example to explain that it also includes a mother-and-child room 18 with a refrigeration function.

[0088] The mother-infant room 18 is provided with a first air inlet 181 , a third air outlet 182 and a fourth air outlet 183 .

[0089] The fourth gas outlet 183 is also provided with an oxygen-enriched membrane.

[0090] The first air inlet 181 of the mother-and-child room 18 is connected in parallel with the air inlet 121 of the refrigerating room 12 , that is, the first air inlet 181 and the air inlet 121 are connected to the air inlet duct 151 , respectively.

[0091] The third air outlet 182 and the fourth air outlet 183 of the mother-and-child room 18 are connected to the exhaust air duct 152 respectively.

[0092] In some embodiments, such as Figure 5 As shown, the sterilization module 14 includes a catalyst carrier 141 and an ultraviolet lamp 142 . The catalyst carrier 141 is disposed in the refrigerating chamber 12 , and a catalyst coating is provided on the catalyst carrier 141 .

[0093] In some embodiments, the catalyst coating may be made of, but not limited to, titanium dioxide.

[0094] The ultraviolet lamp 142 is connected to the control module, and the ultraviolet lamp 142 is turned on or off under the control of the control module.

[0095] Since the density of oxygen is greater than that of nitrogen, in some embodiments, the sterilization module 14 is arranged at the bottom of the refrigerating chamber 12 or the freezing chamber 13 so that it can be more fully in contact with oxygen. When the ultraviolet light 142 is turned on, the oxygen and water vapor on the catalyst carrier 141 will generate O with strong oxidizing ability. 2 - (superoxide ion free radical) and OH- (hydroxyl free radical), thereby powerfully decomposing organic pollutants and pathogens.

[0096] In some embodiments, the catalyst carrier 141 is a glass plate, and there are at least two catalyst carriers 141, which are respectively located above and below the ultraviolet lamp 142. In this way, the surface area of ​​the catalyst coating can be maximized, thereby increasing the catalytic effect of the catalyst.

[0097] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A refrigerator, comprising a housing, a refrigerating chamber and / or a freezing chamber arranged in the housing, characterized in that: The refrigerating chamber and / or the freezing chamber is provided with a sterilizing module, and the refrigerator further comprises: The ventilation system has a plurality of air ducts for connecting the refrigerating chamber and / or freezing chamber with the outside of the shell, and can controllably switch the air ducts through which the air flows.

2. The refrigerator according to claim 1, characterized in that: The shell is provided with a fresh air inlet and an exhaust port, the refrigerating chamber and / or the freezing chamber is provided with an air inlet, a first air outlet and a second air outlet, the second air outlet is provided with an oxygen-enriched membrane, and the ventilation system comprises: An air intake duct connected between the fresh air inlet and the air inlet; an exhaust air duct, a second end of which is connected to the exhaust port; A first exhaust branch connected between the first air outlet and the first end of the exhaust air duct, wherein a first solenoid valve is disposed in the first exhaust branch; The second exhaust branch is connected between the second air outlet and the first end of the exhaust air duct, and a second solenoid valve is arranged in the second exhaust branch.

3. The refrigerator according to claim 2, characterized in that: The ventilation system also includes: An air pump is arranged between the air inlet duct and the fresh air inlet or between the exhaust duct and the exhaust port, and is used to drive external air into the refrigerating chamber and / or freezing chamber and discharge it from the exhaust port after ventilation.

4. The refrigerator according to claim 2, characterized in that: The first end of the exhaust air duct is also provided with a HPEA filter.

5. The refrigerator according to claim 2, characterized in that: The refrigerator further comprises: A connection module is formed with a connection cavity inside thereof. The connection module has connection ports corresponding to the exhaust air duct, the first exhaust branch and the second exhaust branch respectively, and each connection port is connected to the connection cavity respectively.

6. The refrigerator according to claim 5, characterized in that: The HPEA filter is arranged in the connecting cavity at a position close to the first end of the exhaust air duct.

7. The refrigerator according to claim 3, characterized in that: A third solenoid valve is provided in the air intake duct; The refrigerating chambers are multiple, and the air inlets of the multiple refrigerating chambers are connected in parallel.

8. The refrigerator according to any one of claims 1 to 7, characterized in that: The sterilization module comprises: A catalyst carrier, which is arranged in the refrigerating chamber and / or freezing chamber, and has a catalyst coating on the catalyst carrier; The ultraviolet lamp is connected to the control module and is turned on or off under the control of the control module.

9. The refrigerator according to claim 8, characterized in that: The catalyst carrier is a glass plate, and there are at least two catalyst carriers, which are respectively located above and below the ultraviolet lamp.

10. The refrigerator according to any one of claims 2 to 6, characterized in that: A filter screen is arranged at the fresh air inlet.

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