Refrigeration apparatus

Abstract

Disclosed in the present application is a refrigeration apparatus, comprising a plurality of freshness-keeping compartments and a controlled atmosphere module, wherein the controlled atmosphere module comprises a gas outlet for outputting a freshness-keeping gas; a first freshness-keeping compartment is in communication with the gas outlet, and is in series gas flow communication with a second freshness-keeping compartment; and the concentration of the freshness-keeping gas in the second freshness-keeping compartment varies with the concentration of the freshness-keeping gas in the first freshness-keeping compartment. The apparatus can adjust the gas concentration in each freshness-keeping compartment with very little difficulty in terms of pipeline layout, and can form a stable gas gradient between the freshness-keeping compartments, thereby meeting the requirements of different food materials for different freshness-keeping environments in the same apparatus, improving the freshness-keeping performance of the apparatus, reducing production and control costs, and also providing a more flexible user experience.

Description

Refrigeration equipment

[0001] This application is based on and claims priority to Chinese patent applications No. 202411595934.4, No. 202422721582.4, No. 202422731792.1, No. 202422726311.8, and No. 202422726311.8, all of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of cold storage and preservation technology, and more particularly to a refrigeration device. Background Technology

[0003] In existing refrigeration equipment technology, especially in refrigeration equipment used for food preservation, only temperature can usually be adjusted. However, different gas concentrations have a direct and significant impact on the preservation effect of certain foods (such as fresh vegetables, fruits, and fresh meat). For example, different concentrations of oxygen, carbon dioxide, and water vapor are suitable for different foods. Fresh vegetables and fruits have different rates of respiration and oxidation in high-oxygen or low-oxygen environments. Adjusting the oxygen concentration can significantly reduce their spoilage and oxidation rate. Similarly, for meat, oxygen concentration not only affects its color but also inhibits the growth and reproduction of anaerobic bacteria.

[0004] While some refrigeration equipment has attempted to incorporate controlled atmosphere technology, unsatisfactory connections and layouts between the controlled atmosphere system and existing compartments often lead to poor regulation, affecting the stability and uniformity of the atmosphere within the entire preservation chamber. This results in suboptimal preservation effects and short shelf-life for food. Therefore, designing a refrigeration system that optimizes the layout of controlled atmosphere modules and improves regulation efficiency is a pressing technical challenge.

[0005] In addition, some technologies can only regulate the gas concentration in a single compartment. On the one hand, regulating the concentration in multiple compartments will make the piping layout much more difficult. In existing refrigerators, adding a set of piping and a set of control facilities to each compartment greatly increases the volume and cost. On the other hand, it is difficult to provide suitable gas concentration ranges according to the needs of different foods.

[0006] Other technologies can only regulate oxygen concentration in a single room, which has significant limitations in multi-room controlled atmosphere preservation and cannot meet the need for independent oxygen concentration regulation in multiple rooms.

[0007] Any prior art mentioned in the specification does not imply confirmation or suggestion that such prior art constitutes part of the general common knowledge in any jurisdiction, or that it can be reasonably expected that such prior art will be understood, regarded as relevant and / or combined with other prior art by a person skilled in the art. Summary of the Invention

[0008] The purpose of this application is to provide a refrigeration device that can regulate the gas in multiple compartments.

[0009] To achieve the above-mentioned objectives, one embodiment of this application provides a refrigeration device. The refrigeration device includes:

[0010] Multiple fresh-keeping compartments, including a first fresh-keeping compartment and a second fresh-keeping compartment;

[0011] The modified atmosphere module includes an outlet for outputting preservative gas, a first preservation chamber connected to the outlet, and airflow communication between the first and second preservation chambers. The concentration of preservative gas in the second preservation chamber varies with the concentration of preservative gas in the first preservation chamber.

[0012] As a further improvement of this application, the first fresh-keeping compartment is connected to the second fresh-keeping compartment in series, and the airflow output from the modified atmosphere module passes through the first fresh-keeping compartment and reaches the second fresh-keeping compartment.

[0013] As a further improvement of this application, the gas concentration used to adjust the preservation gas output by the modified atmosphere module includes oxygen concentration, or carbon dioxide concentration, or water vapor concentration, or nitrogen concentration, or oxygen concentration and water vapor concentration, or carbon dioxide concentration and water vapor concentration.

[0014] As a further improvement of this application, the modified atmosphere module adjusts the gas concentration in the first preservation room to be lower than or higher than the concentration of the corresponding component in the outside.

[0015] As a further improvement of this application, the first fresh-keeping compartment includes a first air inlet and a first air outlet, the second fresh-keeping compartment includes a second air inlet, the air outlet is connected to the first air inlet, and the first air outlet is connected to the second air inlet.

[0016] As a further improvement to this application, the modified atmosphere module includes a return air port;

[0017] The first fresh-keeping compartment includes a first return air vent, which is connected to the return air inlet; and / or, the second fresh-keeping compartment further includes a second return air vent, which is connected to the return air inlet; and / or, the first fresh-keeping compartment further includes a third air inlet, and the second fresh-keeping compartment further includes a second air outlet, which is connected to the third air inlet.

[0018] As a further improvement of this application, the plurality of preservation compartments further includes a third preservation compartment, which is connected in series with the first or second preservation compartment via airflow.

[0019] As a further improvement to this application, the modified atmosphere module includes a return air port;

[0020] The first preservation room includes a first return air vent, which is connected to the return air inlet;

[0021] The third fresh-keeping compartment is connected to the second fresh-keeping compartment to introduce fresh-keeping gas from the second fresh-keeping compartment; and / or, the third fresh-keeping compartment includes a fifth air inlet and a fifth air outlet, the fifth air inlet being connected to the air outlet of the modified atmosphere module or the second air outlet of the modified atmosphere module, and the fifth air outlet being connected to the air return port of the modified atmosphere module or the second air return port of the modified atmosphere module.

[0022] As a further improvement of this application, the modified atmosphere module is housed in the first fresh-keeping room, and the air outlet discharges fresh-keeping gas in the first fresh-keeping room.

[0023] The first preservation compartment includes a first air outlet, and the second preservation compartment includes a second air inlet, with the first air outlet and the second air inlet connected together.

[0024] As a further improvement of this application, the modified atmosphere module further includes an air inlet and an exhaust outlet, the air inlet and the exhaust outlet being connected to the outside gas in the first preservation chamber.

[0025] As a further improvement of this application, the refrigeration equipment further includes a fluid drive component that drives the airflow in the first preservation chamber to blow towards the second preservation chamber.

[0026] As a further improvement of this application, the fluid drive controls the airflow speed or flow rate so that the gas concentration in the second preservation chamber is between the concentration of the corresponding component in the outside and the concentration of the corresponding component in the first preservation chamber.

[0027] The fluid drive component is configured as a fan or an air pump.

[0028] As a further improvement of this application, the second fresh-keeping compartment is disposed below the first fresh-keeping compartment. The first fresh-keeping compartment includes a first air outlet opening downwards, and the second fresh-keeping compartment includes a second air inlet opening upwards. The first air outlet is connected to the second air inlet.

[0029] As a further improvement of this application, the refrigeration device includes a second cylinder and an air guide cover. The second preservation compartment is formed in the second cylinder. A groove is provided on the upper wall of the second cylinder. The air guide cover is fastened to the groove. The groove and the air guide cover enclose an airflow channel. The fluid drive component is housed in the groove and located in the airflow channel.

[0030] The second air inlet is disposed on the air guide cover, and the groove includes a ventilation hole facing the second cylinder. The second air inlet, the airflow channel and the ventilation hole are connected in sequence.

[0031] As a further improvement of this application, the refrigeration equipment includes a first cylinder, and a first fresh-keeping compartment is formed in the first cylinder; the modified atmosphere module is disposed below the first fresh-keeping compartment and arranged side by side with the second fresh-keeping compartment.

[0032] As a further improvement of this application, the first preservation chamber has a first air inlet and a first air return outlet disposed on the bottom wall of the first cylinder.

[0033] The modified atmosphere module includes an air outlet and an air return outlet. The air outlet is vertically connected to the first air inlet, and the air return outlet is vertically connected to the first air return outlet.

[0034] The refrigeration equipment also includes multiple sealing elements, which are clamped at any position between the first air inlet and the air outlet, between the first return air inlet and the return air outlet, and between the first air outlet and the second air inlet.

[0035] As a further improvement of this application, the first air inlet, the first return air inlet, and the first air outlet are each conical, and their cross-sections gradually decrease from bottom to top. The air outlet is inserted into the first air inlet, the return air inlet is inserted into the first return air inlet, and the second air inlet is inserted into the first air outlet.

[0036] The sealing element includes a first skirt and a second skirt arranged sequentially from top to bottom. The outer diameter of the first skirt is smaller than the outer diameter of the second skirt. The first air inlet, the first air return outlet, and the first air outlet each abut against the first skirt and the second skirt of the corresponding sealing element.

[0037] As a further improvement of this application, the cylinder wall of the first cylinder is provided with an air inlet and an air guide groove. The two ends of the air guide groove are respectively connected to the first air inlet and the air inlet. The fresh-keeping gas at the first air inlet enters the interior of the first cylinder through the air guide groove and then enters the interior of the first cylinder through the air inlet.

[0038] The distance from the air inlet to the first return air outlet is greater than the distance from the first air inlet to the first return air outlet.

[0039] As a further improvement of this application, the distance between the air inlet and the first return air outlet is greater than 1.5*L, where L is the sum of the diameters of the first air inlet and the first return air outlet.

[0040] As a further improvement of this application, the first cylinder includes a groove cover, and the cylinder wall of the first cylinder and the groove cover surround to form the air guide groove.

[0041] Compared with the prior art, this application has the following beneficial effects: By improving the structure and gas path design of the refrigeration equipment, multiple preservation compartments are connected in series. The gas concentration changes with the first preservation compartment, affecting the gas concentration of other preservation compartments, thus achieving dynamic and flexible adjustment. It eliminates the need for the modified atmosphere module to regulate each preservation compartment with independent pipelines and control structures, thereby allowing for the adjustment of the gas concentration of each preservation compartment with very low pipeline layout difficulty. In addition, a stable gas gradient can be formed between each preservation compartment, meeting the requirements of different foods for different preservation environments in the same equipment, improving the preservation performance of the equipment, reducing production and control costs, and providing users with a more flexible user experience.

[0042] The purpose of this application is to provide a refrigeration device that can regulate the gas in multiple compartments.

[0043] To achieve the above-mentioned objectives, one embodiment of this application provides a refrigeration device, comprising:

[0044] Multiple fresh-keeping compartments, including a first fresh-keeping compartment and a second fresh-keeping compartment;

[0045] The modified atmosphere module includes an outlet for outputting preservative gas, a first preservation chamber connected to the outlet, and airflow between the first and second preservation chambers connected in series. The concentration of preservative gas in the second preservation chamber varies with the concentration of preservative gas in the first preservation chamber.

[0046] As a further improvement of this application, the first fresh-keeping compartment is connected to the second fresh-keeping compartment in series, and the airflow output from the modified atmosphere module passes through the first fresh-keeping compartment and reaches the second fresh-keeping compartment.

[0047] As a further improvement of this application, the gas concentration used to adjust the preservation gas output by the modified atmosphere module includes oxygen concentration, or carbon dioxide concentration, or water vapor concentration, or nitrogen concentration, or oxygen concentration and water vapor concentration, or carbon dioxide concentration and water vapor concentration.

[0048] As a further improvement of this application, the modified atmosphere module adjusts the gas concentration inside the first preservation room to be lower than the concentration of the corresponding component in the outside.

[0049] As a further improvement of this application, the first fresh-keeping compartment includes a first air inlet, a first return air inlet, and a first air outlet; the controlled atmosphere module includes a return air inlet; the second fresh-keeping compartment includes a second air inlet; the air outlet is connected to the first air inlet; the first return air inlet is connected to the return air inlet; and the first air outlet is connected to the second air inlet.

[0050] As a further improvement of this application, the second preservation compartment also includes a second return air vent, which is connected to the return air vent.

[0051] As a further improvement of this application, the refrigeration equipment further includes a fluid drive component that drives the airflow in the first preservation chamber to blow towards the second preservation chamber.

[0052] As a further improvement of this application, the fluid drive component controls the airflow rate so that the gas concentration in the second preservation chamber is lower than the concentration of the corresponding component in the outside environment and higher than the concentration of the corresponding component in the first preservation chamber.

[0053] As a further improvement to this application, the fluid drive component is configured as a fan or an air pump.

[0054] As a further improvement of this application, the first fresh-keeping compartment further includes a third air inlet, and the second fresh-keeping compartment further includes a second air outlet, the second air outlet being connected to the third air inlet.

[0055] As a further improvement of this application, the first fresh-keeping compartment includes a first air inlet and a first air outlet, the modified atmosphere module includes a return air outlet, the second fresh-keeping compartment includes a second air inlet and a second return air outlet, the air outlet is connected to the first air inlet, the first air outlet is connected to the second air inlet, and the second return air outlet is connected to the return air outlet.

[0056] As a further improvement of this application, the concentration of the gas regulated by the preservation gas is the oxygen concentration;

[0057] The second fresh-keeping compartment is provided with a second drawer, the opening of the second drawer facing upwards. The second fresh-keeping compartment is located below the first fresh-keeping compartment. The opening of the first air outlet faces downwards, and the opening of the second air inlet faces upwards. The gas flowing into the second air inlet enters the opening downwards.

[0058] As a further improvement of this application, the modified atmosphere module adjusts the gas concentration inside the first preservation room to be higher than the concentration of the corresponding component in the outside.

[0059] As a further improvement of this application, the first fresh-keeping compartment includes a first air inlet and a first air outlet, the second fresh-keeping compartment includes a second air inlet, the air outlet is connected to the first air inlet, and the first air outlet is connected to the second air inlet.

[0060] As a further improvement of this application, the modified atmosphere module is housed in the first preservation chamber. The modified atmosphere module also includes an air inlet and an exhaust outlet. The first preservation chamber includes a first air outlet, and the second preservation chamber includes a second air inlet. The air outlet discharges preservation gas into the first preservation chamber. The air inlet and the exhaust outlet are connected to external gas. The first air outlet is connected to the second air inlet.

[0061] As a further improvement of this application, the third fresh-keeping compartment of the plurality of fresh-keeping compartments is connected to the air outlet;

[0062] or,

[0063] The third fresh-keeping compartment in the plurality of fresh-keeping compartments is connected in series with the first fresh-keeping compartment or the second fresh-keeping compartment via airflow.

[0064] Compared with the prior art, this application has the following beneficial effects: By improving the structure and gas path design of the refrigeration equipment, multiple preservation compartments are connected in series. The gas concentration changes with the first preservation compartment, affecting the gas concentration of other preservation compartments, thus achieving dynamic and flexible adjustment. It eliminates the need for the modified atmosphere module to regulate each preservation compartment with independent pipelines and control structures, thereby allowing for the adjustment of the gas concentration of each preservation compartment with very low pipeline layout difficulty. In addition, a stable gas gradient can be formed between each preservation compartment, meeting the requirements of different foods for different preservation environments in the same equipment, improving the preservation performance of the equipment, reducing production and control costs, and providing users with a more flexible user experience.

[0065] The purpose of this application is to provide a refrigeration device with a compact overall design and good controlled atmosphere preservation effect.

[0066] To achieve the above-mentioned objectives, one embodiment of this application provides a refrigeration device, comprising:

[0067] A first cylindrical body forms a first preservation chamber inside it, and the bottom wall of the first cylindrical body is provided with a first air inlet and a first air return outlet that connect the first preservation chamber.

[0068] A modified atmosphere module is disposed below the first fresh-keeping compartment. The modified atmosphere module includes an air outlet and an air return outlet. The air outlet is connected to the first air inlet, and the air return outlet is connected to the first return air inlet. The modified atmosphere module adjusts the oxygen concentration in the first fresh-keeping compartment through the air outlet and the air return outlet.

[0069] As a further improvement of this application, the refrigeration equipment further includes a plurality of seals, one of which abuts between the first air inlet and the air outlet, and another of which abuts between the first return air inlet and the return air outlet.

[0070] As a further improvement of this application, both the first air inlet and the first air return outlet are conical, and the cross-sections of the first air inlet and the first air return outlet gradually decrease in the direction close to the first fresh-keeping compartment. The air outlet is inserted into the first air inlet, and the air return outlet is inserted into the first air return outlet.

[0071] As a further improvement of this application, the sealing element includes a first skirt and a second skirt arranged sequentially from top to bottom. The outer diameter of the first skirt is smaller than the outer diameter of the second skirt. The first air inlet and the first air return outlet abut against the first skirt and the second skirt of their respective sealing elements.

[0072] As a further improvement of this application, both the air outlet and the air return port include a limiting bottom wall, a pipe wall and a limiting upper wall arranged sequentially from bottom to top, and the sealing member is sleeved on the outer surface of the pipe wall and abuts against the limiting bottom wall and the limiting upper wall.

[0073] As a further improvement of this application, the first preservation chamber further includes an air inlet and an air guide groove. The two ends of the air guide groove are respectively connected to the first air inlet and the air inlet. The distance from the air inlet to the first return air inlet is greater than the distance from the first air inlet to the first return air inlet.

[0074] As a further improvement of this application, the refrigeration equipment further includes a sealing strip and a groove cover, wherein the groove cover abuts against the sealing strip between the sealing strip and the cylinder wall of the first cylinder, and the groove cover and the cylinder wall of the first cylinder enclose the air guide groove.

[0075] As a further improvement of this application, the refrigeration device includes a first drawer, the first cylinder includes a forward opening, the first drawer is received in the first preservation chamber through the opening, the air guide groove is disposed on the rear wall of the first cylinder, and the air inlet is disposed on the rear wall of the first cylinder.

[0076] As a further improvement of this application, the cross-sections of the first air inlet, the first return air inlet, the air outlet, and the return air inlet are all square. The air outlet is inserted into the first air inlet, and the return air inlet is inserted into the first return air inlet. A plurality of snap-fit ​​pieces are provided in the first preservation room. One of the snap-fit ​​pieces is snapped between the air outlet and the first air inlet to restrict the separation of the air outlet and the first air inlet; another snap-fit ​​piece is snapped between the return air inlet and the first return air inlet to restrict the separation of the return air inlet and the first return air inlet.

[0077] As a further improvement of this application, the refrigeration equipment includes a refrigeration chamber and a leak-proof compartment, the controlled atmosphere module is disposed in the leak-proof compartment, and the leak-proof compartment isolates the controlled atmosphere module from the refrigeration chamber.

[0078] As a further improvement of this application, the refrigeration equipment further includes a second cylinder, in which a second preservation chamber is formed. The second preservation chamber is located below the first preservation chamber and is arranged horizontally parallel to the modified atmosphere module. The preservation gas of the modified atmosphere module enters the second preservation chamber.

[0079] As a further improvement of this application, the first fresh-keeping compartment further includes a downwardly disposed second air outlet, and the second fresh-keeping compartment includes an upwardly disposed second air inlet, with the second air outlet connected to the second air inlet.

[0080] As a further improvement of this application, the refrigeration equipment further includes a fluid drive component that drives the airflow in the first preservation chamber to blow towards the second preservation chamber.

[0081] As a further improvement of this application, the modified atmosphere module includes a third air outlet and a third air return port. The modified atmosphere module adjusts the oxygen concentration in the second preservation chamber through the third air outlet and the third air return port. The oxygen concentration in the second cylinder is lower than the outside oxygen concentration but higher than the oxygen concentration in the first preservation chamber.

[0082] As a further improvement of this application, the second fresh-keeping compartment contains a second drawer, and a guide air duct is provided on the outer side of the cylinder wall of the second cylinder. The second fresh-keeping compartment includes an airflow channel and a accommodating space. The airflow channel is formed in the guide air duct outside the cylinder wall of the second cylinder, and the accommodating space is surrounded by the cylinder wall of the second cylinder. Ventilation holes are provided on the cylinder wall of the second cylinder. The third air outlet is connected to the airflow channel, and the third air return port is connected to the accommodating space. The airflow blown out from the third air outlet passes through the airflow channel, the ventilation holes, and the accommodating space in sequence before reaching the third air return port.

[0083] Compared with commonly used technologies, this application has the following advantages: by setting the modified atmosphere module below the first fresh-keeping compartment, a vertically connected airflow path structure is formed. The regulated gas can directly enter the first fresh-keeping compartment from below. Through natural upward and dispersed flow, the oxygen concentration in the entire compartment can be more evenly distributed. Moreover, the modified atmosphere module and the fresh-keeping compartment form a relatively independent modular structure with a reasonable layout, which improves the overall design rationality and space utilization of the refrigeration equipment, and greatly enhances the food preservation effect and the overall performance of the equipment.

[0084] The purpose of this application is to provide a refrigeration device that can create different concentrations in two compartments and has a convenient adjustment process.

[0085] To achieve the above-mentioned objectives, one embodiment of this application provides a refrigeration device, comprising:

[0086] The first preservation compartment is formed within the first cylindrical body;

[0087] A modified atmosphere module is connected to the first fresh food compartment, and the modified atmosphere module adjusts the oxygen concentration in the first fresh food compartment;

[0088] The second fresh-keeping compartment is formed in the second cylinder and is connected to the first fresh-keeping compartment;

[0089] A fluid drive unit that drives the airflow in the first preservation chamber to blow towards the second preservation chamber.

[0090] As a further improvement of this application, the second fresh-keeping compartment is disposed below the first fresh-keeping compartment, the first cylinder includes a first air outlet opening downwards, the second fresh-keeping compartment includes a second air inlet opening upwards, and the first air outlet is connected to the second air inlet.

[0091] As a further improvement of this application, the second cylinder includes an upper wall and an air guide cover. The upper wall is provided with a groove, the fluid drive component is housed in the groove, and the air guide cover is fastened to the groove. The groove and the air guide cover together enclose an airflow channel.

[0092] The air guide cover is provided with a second air inlet, and the groove includes a ventilation hole facing the second cylinder. The second air inlet, the airflow channel and the ventilation hole are connected in sequence.

[0093] As a further improvement to this application, the fluid drive component is configured as a centrifugal fan.

[0094] As a further improvement of this application, the centrifugal fan is disposed in the central region of the upper wall;

[0095] The second preservation compartment contains a second drawer, the second drawer including an upward-facing second opening, and the ventilation holes facing the second opening.

[0096] As a further improvement of this application, the second preservation compartment also includes a first sealing element, which is clamped between the upper wall and the air guide cover.

[0097] As a further improvement of this application, the refrigeration device further includes a second seal, which is clamped between the first air outlet and the second air inlet.

[0098] As a further improvement of this application, the first air outlet is conical, and the cross-section of the first air outlet gradually decreases in the direction close to the first preservation compartment.

[0099] As a further improvement of this application, the second sealing member includes a first skirt and a second skirt arranged sequentially from top to bottom, the outer diameter of the first skirt is smaller than the outer diameter of the second skirt, and both the first skirt and the second skirt abut against the first air outlet.

[0100] As a further improvement of this application, the second air inlet includes a limiting bottom wall, a pipe wall and a limiting top wall arranged sequentially from bottom to top, and the second sealing member is sleeved on the outer surface of the pipe wall and abuts against the limiting bottom wall and the limiting top wall.

[0101] Compared with commonly used technologies, this application has the following beneficial effects: By improving the structure and air path design of the refrigeration equipment, flexible control of different oxygen concentrations in multiple compartments is achieved. A fluid drive component guides the airflow, whose oxygen concentration has been adjusted by the modified atmosphere module, from the first preservation compartment to the second preservation compartment. On the one hand, a natural oxygen concentration gradient is formed between the two compartments. For example, with oxygen-deficient gas, the oxygen concentration in the first preservation compartment is lower than that in the second preservation compartment; with oxygen-enriched gas, the oxygen concentration in the first preservation compartment is higher than that in the second preservation compartment. On the other hand, by controlling the rotation speed and operating time of the fluid drive component, the second preservation compartment can be adjusted to any value within the range between the atmospheric oxygen concentration and the oxygen concentration in the first preservation compartment. The adjustment is precise, achieving flexible adjustment of different oxygen concentration environments within the same refrigeration equipment at low cost, meeting the needs of different food ingredients, and thus improving the overall energy efficiency and performance of the equipment.

[0102] The purpose of this application is to provide a refrigeration device that can improve the efficiency of oxygen concentration regulation.

[0103] To achieve the above objectives, this application provides a refrigeration device, wherein the refrigeration device includes a fresh-keeping compartment and a controlled atmosphere module disposed outside the fresh-keeping compartment. The controlled atmosphere module is used to adjust the oxygen content inside the fresh-keeping compartment. The controlled atmosphere module includes an air outlet and an air return outlet. The outer wall of the fresh-keeping compartment is provided with a first air inlet communicating with the air outlet and a first air return outlet communicating with the air return outlet. The refrigeration device also includes an air guiding structure, which is used to guide the gas entering the fresh-keeping compartment from the first air inlet in a direction away from the first air return outlet.

[0104] As a further improvement of this application, the outer wall recess is formed with a recessed groove, the recessed groove includes a first groove end communicating with the first air inlet, the recessed groove also includes a second groove end away from the first return air inlet, the refrigeration equipment includes a groove cover covering the opening of the recessed groove, the air guide groove and the groove cover surround to form an air guide groove, the groove cover or the wall of the air guide groove is formed with an air inlet hole near the second groove end, and the air inlet hole communicates with the interior of the preservation room.

[0105] As a further improvement of this application, the air guide groove is formed by the inward indentation of the outer wall, and the groove cover is disposed outside the preservation chamber.

[0106] As a further improvement of this application, the preservation compartment further includes a sealing strip disposed between the tank cover and the outer wall, the sealing strip being used to seal the gap between the tank cover and the outer wall.

[0107] As a further improvement of this application, the fresh-keeping compartment includes a baffle plate disposed between the first air inlet and the first air return outlet.

[0108] As a further improvement of this application, the wind deflector and the outer wall form a wind deflector channel, the air inlet end of the wind deflector channel is connected to the first air inlet, and the air outlet end of the wind deflector channel is far away from the first return air inlet.

[0109] As a further improvement of this application, the modified atmosphere module includes a housing and a modified atmosphere unit disposed within the housing. The housing forms the air outlet and the air return port. The modified atmosphere unit is used to reduce the oxygen content of the gas entering the housing from the air return port. The air outlet is used to transport the low-oxygen gas in the housing to the fresh-keeping compartment, thereby reducing the oxygen content in the fresh-keeping compartment.

[0110] As a further improvement of this application, the distance between the air inlet and the first return air outlet is greater than 1.5*L, where L is the sum of the diameters of the first air inlet and the first return air outlet.

[0111] As a further improvement of this application, the refrigeration equipment includes a cabinet, a refrigeration chamber formed in the cabinet, and a door for opening and closing the refrigeration chamber. The fresh-keeping chamber is disposed in the refrigeration chamber. The refrigeration equipment includes a cylinder and a drawer. The cylinder surrounds the fresh-keeping chamber and has a front opening. The drawer is installed in the cylinder and can be pulled out through the front opening. The front panel of the drawer is used to open and close the front opening of the cylinder. A cylinder sealing element is provided between the front panel of the drawer and the front wall of the cylinder. The cylinder sealing element is used to seal the gap between the front panel of the drawer and the front wall of the cylinder.

[0112] As a further improvement of this application, the controlled atmosphere module is disposed below the cylinder body, the bottom wall of the cylinder body forms the first air inlet and the first air return outlet, the first air inlet is close to the rear wall of the cylinder body, the first air return outlet is close to the left / right wall of the cylinder body, the rear wall of the cylinder body forms the air guide groove, the refrigeration compartment is a cold storage compartment, the rear wall of the drawer forms a first opening that cooperates with the air inlet, and the bottom wall and left / right walls of the drawer form a second front opening that cooperates with the first air return outlet.

[0113] Compared with the prior art, this application uses a fresh-keeping room and a controlled atmosphere module located outside the fresh-keeping room, and guides the gas entering the fresh-keeping room from the first air inlet to a direction away from the first return air inlet through an air guiding structure. Its beneficial effects are: it can regulate the oxygen concentration in the fresh-keeping room, while increasing the circulation distance of the gas in the fresh-keeping room and improving the oxygen concentration regulation efficiency.

[0114] The term “comprise” as used herein, and variations thereof such as “comprises”, “comprised”, “comprising”, “including”, and “containing”, do not exclude other features, components, elements, or steps unless the context clearly requires otherwise. Attached Figure Description

[0115] Figure 1 is a schematic diagram of the structure of a refrigeration device according to an embodiment of this application;

[0116] Figure 2 is a structural block diagram of the fresh-keeping compartment and the modified atmosphere module of the first embodiment of this application;

[0117] Figure 3 is a schematic diagram of the structure of the first preservation compartment according to the first embodiment of this application;

[0118] Figure 4 is a schematic diagram of the structure of the modified atmosphere module in the first embodiment of this application;

[0119] Figure 5 is an exploded view of the preservation structure component in the first preservation compartment of the first embodiment of this application;

[0120] Figure 6 is an exploded view of the second preservation chamber and the modified atmosphere module of the first embodiment of this application;

[0121] Figure 7 is a top view of the second preservation chamber, fluid drive unit, and modified atmosphere module of the first embodiment of this application;

[0122] Figure 8 is a magnified view of part A in Figure 7;

[0123] Figure 9 is a cross-sectional view of the second preservation chamber, the fluid drive unit, and the modified atmosphere module according to the first embodiment of this application.

[0124] Figure 10 is a magnified view of part B in Figure 9;

[0125] Figure 11 is a side view of the first fresh-keeping compartment and the modified atmosphere module and the second fresh-keeping compartment separated according to the first embodiment of this application;

[0126] Figure 12 is a magnified view of part A in Figure 11;

[0127] Figure 13 is a structural schematic diagram of the first fresh-keeping compartment from the rear view of the first embodiment of this application;

[0128] Figure 14 is a schematic diagram of the structure after removing the upper and rear walls of the cylinder in Figure 13;

[0129] Figure 15 is a structural schematic diagram of the windbreak plate according to the first embodiment of this application;

[0130] Figure 16 is a structural block diagram of multiple preservation compartments and a modified atmosphere module according to the second embodiment of this application;

[0131] Figure 17 is a structural block diagram of multiple preservation compartments and a modified atmosphere module according to the third embodiment of this application;

[0132] Figure 18 is a structural block diagram of multiple preservation compartments and a modified atmosphere module according to the fourth embodiment of this application;

[0133] Figure 19 is an exploded view of multiple preservation compartments and a controlled atmosphere module according to the fourth embodiment of this application;

[0134] Figure 20 is a cross-sectional view of multiple preservation compartments and a modified atmosphere module according to the fourth embodiment of this application;

[0135] Figure 21 is a structural block diagram of multiple preservation compartments and a modified atmosphere module according to the fifth embodiment of this application;

[0136] Figure 22 is a structural block diagram of multiple preservation compartments and a modified atmosphere module according to the sixth embodiment of this application;

[0137] Figure 23 is a structural block diagram of multiple preservation compartments and modified atmosphere module according to the seventh embodiment of this application;

[0138] Figure 24 is a structural block diagram of multiple preservation compartments and modified atmosphere module according to the eighth embodiment of this application;

[0139] Figure 25 is a side view of the first and second preservation compartments of the ninth embodiment of this application;

[0140] Figure 26 is a cross-sectional view along the AA direction in Figure 25;

[0141] Figure 27 is a magnified view of part B in Figure 26;

[0142] Figure 28 is a cross-sectional view along the BB direction in Figure 25;

[0143] Figure 29 is a magnified view of part C in Figure 28;

[0144] Figure 30 is an exploded view of the first preservation compartment and the modified atmosphere module according to the tenth embodiment of this application.

[0145] Figure 31 is an exploded view from another perspective of the first preservation compartment and the modified atmosphere module of the tenth embodiment of this application. Detailed Implementation

[0146] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0147] It should be understood that terms such as “above,” “over,” “below,” and “under” used herein to indicate spatial relative position are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative position” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0148] [First Embodiment]

[0149] Referring to Figures 1 and 2, one embodiment of this application provides a refrigeration device 100 that allows for convenient adjustment of the concentration of preservative gases in multiple preservation compartments, with a convenient adjustment process. It achieves airflow guidance from the first preservation compartment 10 to the second preservation compartment 20, facilitating the formation of various oxygen concentration gradients within the multiple compartments. This not only meets the different preservation needs of various foods but also improves the preservation effect and the energy efficiency of the device.

[0150] The refrigeration device 100 in this embodiment refers to a mechanical system or device used to reduce and control the temperature of an object or space. Based on its ability to reduce the temperature of a space or object, the refrigeration device 100 is widely used in homes, businesses, and other locations. In one embodiment, the refrigeration device 100 may be a refrigerator, freezer, wine cabinet, refrigerated display case, etc.

[0151] Refrigerators are understandably one of the most common refrigeration devices in households, used to preserve food, prevent spoilage, and extend its shelf life. Display cases are widely used in commercial environments, primarily for displaying and preserving foods such as beverages, cooked foods, pastries, and dairy products. These devices not only maintain food at suitable temperatures but also optimize product display, attracting customers to purchase. Display cases come in various designs and structures, and can be broadly categorized into several types based on usage needs and occasions, including freestanding, tabletop, wall-mounted, and built-in models. Display case components maintain food at safe and suitable temperatures, extending its shelf life and preventing spoilage. Their transparent design makes food readily visible, allowing customers to easily view and select the items they want, improving shopping efficiency.

[0152] The following explanation uses a refrigerator as an example of a refrigeration device 100.

[0153] The refrigerator includes a cabinet, a door, a refrigeration system, a refrigeration compartment 90, multiple fresh-keeping compartments, a cooling unit, and a controlled atmosphere module 30.

[0154] The enclosure includes a shell, an inner liner, and an insulation layer, with the insulation layer located between the shell and the inner liner.

[0155] The refrigeration system includes a compressor, condenser, capillary tube, evaporator, and refrigeration piping.

[0156] The inner liner encloses a refrigeration compartment 90 with a door opening, and multiple fresh-keeping compartments can be located within the refrigeration compartment 90. The environment of each fresh-keeping compartment is relatively isolated from the other spaces in the refrigeration compartment 90 (i.e., other spaces besides the fresh-keeping compartments). In other words, without considering the factor of absolute airtightness, each fresh-keeping compartment is relatively isolated from the other spaces in the refrigeration compartment 90. In addition, since absolute airtightness is not required, the internal air pressure will not increase sharply after gas is introduced into the fresh-keeping compartment.

[0157] The refrigeration room 90 can be a refrigerator room, a freezer room, a variable temperature room, etc. The refrigeration room 90 mentioned below will be described using a refrigerator room as an example.

[0158] The door is movably connected to the housing and is used to open and close the refrigeration compartment.

[0159] The cooling system includes a cooling air supply path, a first fan, and a first damper. When the first fan is running, the first damper is open, and the cooling air supplied to each fresh-keeping compartment by the cooling air supply path flows only on the outside of the fresh-keeping compartment. The cooling capacity is indirectly transferred into the interior of the fresh-keeping compartment through the outer wall (e.g., the first cylinder 101, the second cylinder 201, etc., as described below).

[0160] Multiple preservation compartments are compartments specifically designed for preserving fresh ingredients, and the gas concentration inside them can be adjusted.

[0161] The modified atmosphere module 30 is used to output preservative gas to at least some of the preservation compartments to regulate the gas concentration in multiple preservation compartments. Specifically, the gas concentration regulated by the preservative gas output by the modified atmosphere module 30 includes oxygen concentration, or carbon dioxide concentration, or water vapor concentration, or nitrogen concentration, or both oxygen and water vapor concentration, or both carbon dioxide and water vapor concentration.

[0162] Different preservative gases can be applied to the preservation needs of different types of food. For example, adjusting the oxygen concentration helps prolong the freshness of meat, while adjusting the carbon dioxide concentration can inhibit the respiration of fruits and vegetables, thereby extending their shelf life. Controlling the water vapor concentration can maintain the humidity in the preservation room, preventing food from drying out due to water loss. In other words, the modified atmosphere module 30 provides a variety of preservation modes for its corresponding preservative gases. On the one hand, it meets the need for fine adjustment of different gas components; on the other hand, its structure is highly versatile and can be applied to different structures. Adjusting the nitrogen concentration also corresponds to changes in oxygen content. For example, the higher the nitrogen concentration, the lower the corresponding oxygen content. The purpose of adjusting the nitrogen concentration is the same as that of adjusting the oxygen concentration.

[0163] In this way, by adjusting the concentration of different gases according to the characteristics of the food being stored, the food in the fresh food storage room can be kept in the best storage condition.

[0164] In one embodiment, the modified atmosphere module 30 includes an outlet 31 for outputting preservation gas, and the plurality of preservation compartments include a first preservation compartment 10 and a second preservation compartment 20.

[0165] The first preservation compartment 10 is connected to the air outlet 31. The first preservation compartment 10 and the second preservation compartment 20 are connected in series. The concentration of the preservative gas in the second preservation compartment 20 changes with the concentration of the preservative gas in the first preservation compartment 10. That is, the modified atmosphere module 30 directly regulates the gas concentration in the first preservation compartment 10. Since the first preservation compartment 10 is connected to the second preservation compartment 20, the modified atmosphere module 30 indirectly regulates the gas concentration in the second preservation compartment 20.

[0166] In this embodiment, the airflow between the two preservation chambers is connected in series, ensuring that the preservation gas output by the modified atmosphere module 30 flows sequentially through both chambers. This achieves dynamic and coordinated adjustment of gas concentrations in different preservation chambers. The series structure between the chambers simplifies the overall layout of the gas path, reduces the number of independent gas paths within the equipment, and lowers system complexity and manufacturing costs. This series design ensures that each preservation chamber can automatically adjust according to changes in the gas concentration of the preceding chamber, ensuring that the equipment can flexibly adapt to the preservation needs of different foods. Especially in scenarios requiring precise control of the concentration of preservation gases such as oxygen or carbon dioxide, it achieves excellent preservation results.

[0167] The modified atmosphere module 30 can adjust the gas concentration in the first preservation chamber 10 to be lower or higher than the concentration of the corresponding component in the outside atmosphere. Taking the main function of the preservation gas to regulate oxygen concentration as an example, the modified atmosphere module 30 can adjust the oxygen concentration in the first preservation chamber 10 to be lower or higher than the oxygen concentration in the outside atmosphere; taking the main function of the preservation gas to regulate carbon dioxide concentration as an example, the modified atmosphere module 30 can adjust the carbon dioxide concentration in the first preservation chamber 10 to be lower or higher than the carbon dioxide concentration in the outside atmosphere; taking the main function of the preservation gas to regulate water vapor concentration as an example, the modified atmosphere module 30 can adjust the humidity in the first preservation chamber 10 to be lower or higher than the humidity in the outside (or the refrigeration chamber 90).

[0168] The following explanation will use the adjustment of oxygen concentration as an example. Modified atmosphere module 30 is the modified atmosphere module used to adjust oxygen concentration.

[0169] Taking the modified atmosphere module 30 for regulating a low-oxygen environment as an example, through precise oxygen concentration control, a stable low-oxygen environment can be provided for stored food, inhibiting its respiration and extending its shelf life. The benefits of a low-oxygen environment are that it significantly reduces the oxidation rate of food and decreases microbial growth, especially for perishable fruits and vegetables, where the preservation effect is particularly significant. Because this solution can precisely control the oxygen concentration, it avoids the problem of unstable food quality caused by excessive fluctuations in oxygen concentration in traditional equipment, thus ensuring a long-term preservation effect.

[0170] The oxygen concentration in the outside atmosphere is generally around 21%, while the oxygen concentration in the first preservation chamber 10 and the second preservation chamber 20 can be reduced to the range of 15% to 20%.

[0171] Taking the modified atmosphere module 30 for regulating a high-oxygen environment as an example, some foods have better storage effects in environments with higher oxygen concentrations, such as fresh pork, beef, and lamb. In high-oxygen packaging, the higher oxygen concentration inhibits the growth and reproduction of anaerobic bacteria. The higher oxygen concentration can also combine with deoxymyoglobin on the muscle surface to form a thicker layer of oxymyoglobin, maintaining the bright red color of the meat and improving its color stability. Simultaneously, the higher oxygen concentration protects the meat color because lower oxygen concentrations would induce deoxymyoglobin to oxidize into methemoglobin. Under higher oxygen concentrations, the surface of the meat is mainly composed of oxymyoglobin, which will not directly oxidize into methemoglobin. The modified atmosphere module 30 can also be used to regulate the oxygen concentration in the first preservation compartment 10 and the second preservation compartment 20, making their oxygen concentration higher than the external oxygen concentration, for example, reaching a range of 22% to 25%.

[0172] In one embodiment, the modified atmosphere module 30 includes a modified atmosphere unit for preparing a preservative gas.

[0173] The specific components of the controlled atmosphere unit can utilize existing oxygen reduction technologies.

[0174] In this embodiment, the controlled atmosphere unit may include an electrolytic cell, at least one anode, and at least one cathode. The anode is controllably connected to the positive terminal of the power supply, and the cathode is controllably connected to the negative terminal of the power supply.

[0175] Thus, when the controller controls the operation of the modified atmosphere module 30, under the control of the controller, the positive terminal of the power supply is connected to the anode and the negative terminal of the power supply is connected to the cathode, that is, the power supply supplies power to the modified atmosphere module 30; and when the controller controls the modified atmosphere module 30 to stop, under the control of the controller, the positive terminal of the power supply is connected to the anode and the negative terminal of the power supply is connected to the cathode, that is, the power supply stops supplying power to the modified atmosphere module 30.

[0176] The electrolytic cell has an internal cavity for storing electrolyte, and the anode and cathode can be at least partially immersed in the electrolyte. For example, a first side of the cathode is exposed in the internal cavity, and a second side is exposed to the external air of the controlled atmosphere unit. The anode and cathode can be arranged alternately.

[0177] A waterproof and breathable composite layer may be provided on one or both sides of the cathode. The cathode and the composite layer together form an independent oxygen-generating membrane, allowing oxygen from the air to pass through the composite layer into the inner cavity while preventing the electrolyte from seeping out of the inner cavity. At least part of the side of the cathode with the composite layer is exposed outside the electrolytic box to adsorb oxygen from the air. The electrolytic box is provided with an outlet channel communicating with the inner cavity. The electrical terminal on the anode extends out of the electrolytic box and is electrically connected to the power supply anode.

[0178] When the controlled atmosphere module 30 is running, i.e., when it is energized, the cathode is used to consume oxygen in the outside air of the controlled atmosphere unit through an electrochemical reaction. Specifically, oxygen undergoes a reduction reaction at the cathode, with the reaction formula being O2 + 2H2O + 4e. - →4OH - In this way, an oxygen-deficient preservative gas can be formed outside the controlled atmosphere unit.

[0179] One or both sides of the anode are exposed in the inner cavity. The anode is used to generate oxygen in the inner cavity through an electrochemical reaction to form an oxygen-rich preservative gas. Specifically, OH- in the electrolyte... - An oxidation reaction can occur at the anode to produce oxygen, with the reaction formula being 4OH⁻. - →O2 + 2H2O + 4e - The generated oxygen is collected to form an oxygen-rich preservative gas.

[0180] This allows for adjustment of oxygen concentration based on demand, selection of appropriate oxygen-deficient or oxygen-enriched preservation gases, and supply to the corresponding preservation compartments. For example, it can be supplied to the first preservation compartment 10 through outlet 31.

[0181] Of course, in addition to these methods, the controlled atmosphere unit can also use physical methods to separate oxygen molecules from the gas to reduce the oxygen content, or use chemical methods to adsorb oxygen from the gas to reduce the oxygen content. For example, the controlled atmosphere unit may include an oxygen separation membrane. An oxygen separation membrane is a specially designed selective membrane structure that allows oxygen molecules to permeate during gas flow. The membrane material has high selectivity for oxygen and low permeability for other gases, thus reducing the oxygen content in the gas through physical separation, creating an oxygen-deficient preservative gas. As another example, the controlled atmosphere unit may include specific adsorbent materials (such as zeolite or carbon molecular sieves) that selectively adsorb oxygen molecules, removing oxygen from the circulating gas and creating an oxygen-deficient preservative gas. The controlled atmosphere unit may also include a vacuum pump. The vacuum pump is used to create a low-pressure environment within the system, promoting oxygen removal and further improving the oxygen reduction effect.

[0182] Of course, the controlled atmosphere unit can also use other technologies to generate oxygen-deficient or oxygen-enriched preservation gases, and supply them to the corresponding preservation compartments according to their preservation needs.

[0183] The oxygen-deficient preservation gas, oxygen-enriched preservation gas, gas with a composition different from the outside atmosphere, or gas with a humidity different from the outside / refrigeration room 90% described herein all constitute the preservation gas in this application.

[0184] Next, referring to Figures 2 and 3, in this embodiment, the first fresh-keeping compartment 10 includes a first air inlet 11, a first return air inlet 12, and a first air outlet 13. The controlled atmosphere module 30 also includes a return air inlet 32. The second fresh-keeping compartment 20 includes a second air inlet 21. The air outlet 31 is connected to the first air inlet 11, the first return air inlet 12 is connected to the return air inlet 32, and the first air outlet 13 is connected to the second air inlet 21.

[0185] The first preservation chamber 10 is connected to the controlled atmosphere module 30 and the second preservation chamber 20 via the first air inlet 11, the first return air inlet 12, and the first air outlet 13, forming a complete gas circulation system. This ensures effective gas flow between the controlled atmosphere module 30, the first preservation chamber, and the second preservation chamber, guaranteeing controllable gas concentration changes in both chambers. After entering the first preservation chamber 10, a portion of the gas returns to the controlled atmosphere module 30 via the first return air inlet 12, forming a closed loop, while the remaining gas reaches the second preservation chamber 20 via the first air outlet 13, thus achieving stable control of the gas composition. In this structure, the gas concentration in the second preservation chamber 20 is between the concentration of the corresponding component in the external environment and the concentration of the corresponding component in the first preservation chamber.

[0186] For example, when the air outlet 31 of the modified atmosphere module 30 supplies the first preservation chamber 10 with an oxygen-deficient gas concentration lower than that of the outside environment, the oxygen concentration in the second preservation chamber 20 will be higher than that in the first preservation chamber 10, but lower than the outside oxygen concentration. In this configuration, the first preservation chamber 10 has the lowest oxygen concentration and can be used to store ingredients most sensitive to oxygen concentration, such as fresh-cut fruits and tender leafy vegetables; while the second preservation chamber 20 has a slightly higher oxygen concentration but still lower than the outside environment, and can be used to store general fruits, vegetables, or meats. This gradient oxygen concentration distribution effectively inhibits the oxidation rate and respiration of different types of ingredients, while avoiding cross-contamination caused by uneven oxygen concentration between ingredients.

[0187] In a variation embodiment, when the outlet 31 of the modified atmosphere module 30 supplies oxygen-enriched preservation gas to the first preservation chamber 10, the oxygen concentration in the second preservation chamber 20 will be lower than that in the first preservation chamber 10, but higher than that in the outside oxygen concentration.

[0188] In this embodiment, both the first preservation chamber 10 and the second preservation chamber 20 are oxygen-deficient (i.e., low oxygen concentration) preservation chambers.

[0189] The modified atmosphere module 30 forms a closed-loop gas circulation system through the return air port 32 and the outlet air port 31. The gas continuously circulates between the first preservation chamber 10 and the modified atmosphere module 30. The modified atmosphere unit processes the recovered gas to reduce its oxygen content and then sends it back to the container. Through repeated circulation, the oxygen content in the preservation structure component 1 can be reduced quickly and effectively, thereby improving the oxygen regulation efficiency.

[0190] That is, during operation, the gas in the first preservation chamber 10 returns to the modified atmosphere module 30 through the return air port 32. The oxygen contained in the gas passes through the composite layer and reaches the cathode surface. Under the action of the DC electric field, it reacts on the cathode surface and is consumed, forming an oxygen-deficient preservation gas, which is then discharged from the air outlet 31 to the first preservation chamber 10 and the second preservation chamber 20. At the same time, a reverse reaction is generated on the anode to produce pure oxygen. The pure oxygen produced can be supplied to the oxygen-enriched preservation chamber as an oxygen-enriched preservation gas, or it can be directly discharged to the outside.

[0191] Of course, in a variation embodiment, the first preservation chamber 10 and the second preservation chamber 20 can also be oxygen-enriched (i.e., high oxygen concentration) preservation chambers. In this case, the return air port 32 can be omitted and only the air outlet 31 can be retained. At the same time, the air outlet 31 is connected to the inner cavity of the electrolysis box so that the oxygen-enriched preservation gas in the inner cavity can be supplied to the first preservation chamber 10 and the second preservation chamber 20.

[0192] Referring to Figure 4, in one embodiment, the modified atmosphere module 30 includes a housing 301, and the modified atmosphere unit is disposed within the housing 301. The housing 301 forms an outlet 31 and an inlet 32. The modified atmosphere unit is used to reduce the oxygen content of the gas entering the housing 301 from the inlet 32. The outlet 31 is used to deliver the oxygen-deficient preservation gas in the housing 301 to the first preservation compartment 10 and the second preservation compartment 20.

[0193] Furthermore, to clearly express the position and direction described in this embodiment, in this embodiment, the direction of gravity is defined as up and down, that is, the direction of gravity is down and the opposite direction is up. When the user operates the items in the refrigerator, the user stands in front of the refrigerator and the opposite direction is behind. The two sides of the plane containing the front, back, up and down are the left and right sides, respectively.

[0194] Referring to Figure 5, the refrigeration equipment 100 includes a preservation structure assembly 1 for constructing a first preservation compartment 10. Specifically, the preservation structure assembly 1 includes a first cylinder 101 and a first drawer 137. The first cylinder 101 has a front opening. The first preservation compartment 10 is formed within the first cylinder 101.

[0195] The first drawer 137 is installed inside the first cylinder 101 through a front opening. The front panel 1371 of the drawer is used to open and close the front opening of the first cylinder 101. The first drawer 137 includes a first opening with the top facing upward, and the user can pull out the first drawer 137 and take food into the first drawer 137 through the first opening.

[0196] The design incorporates a first cylinder 101 and a first drawer 137, allowing users to easily remove or place stored items from the refrigeration compartment 90 without fully opening the first preservation compartment 10. This design not only simplifies the process of retrieving and placing items but also reduces the chance of gas loss from the first preservation compartment 10, maintaining a stable internal environment. Furthermore, by forming the first preservation compartment 10 within the first cylinder 101, it facilitates the connection of the gas paths between the first preservation compartment 10 and the controlled atmosphere module 30 and the second preservation compartment 20.

[0197] A cylinder seal 138 is provided between the drawer front panel 1371 and the front wall of the first cylinder 101. The cylinder seal 138 is used to seal the gap between the drawer front panel 1371 and the front wall of the first cylinder 101. In addition, the cylinder seal 138 can be easily replaced and inspected, extending the service life of the equipment.

[0198] The front panel 1371 of the drawer is sealed to the front wall of the first cylinder 101 by a cylinder seal 138. This seal effectively fills the gap between the front panel 1371 and the front wall of the first cylinder 101, preventing gas leakage. Sealing is crucial for maintaining a low-oxygen environment in the first preservation chamber 10. By using the cylinder seal 138, oxygen is prevented from seeping in through the gap, thus avoiding affecting the oxygen concentration inside the container. This design significantly improves oxygen regulation, allowing stored items to remain in a stable low-oxygen environment for extended periods, extending preservation time. When the first drawer 137 is closed, the cylinder seal 138 between the front panel 1371 and the front wall of the first cylinder 101 ensures that the gas is completely sealed within the first preservation chamber 10, effectively preventing the infiltration of external oxygen. By maintaining the stability of the internal gas environment, the first preservation chamber 10 can continuously operate at high efficiency, reducing the need for frequent adjustments to the oxygen concentration, thereby improving the overall energy efficiency of the equipment.

[0199] Similarly, referring to Figure 6, the refrigeration device 100 includes a second cylindrical body 201 with a second front opening and a second drawer 237, with a second fresh-keeping compartment 20 formed within the second cylindrical body 201. The second drawer 237 is pull-out mounted within the second cylindrical body 201 through the front opening. The front panel of the second drawer 237 is used to open and close the front opening of the second cylindrical body 201. The second drawer 237 includes a second opening facing upwards, allowing the user to pull out the second drawer 237 and access food items through the second opening. Thus, a first fresh-keeping compartment 10 is formed within the first cylindrical body 101, and a second fresh-keeping compartment 20 is formed within the second cylindrical body 201, facilitating the airflow connection between the first fresh-keeping compartment 10 and the second fresh-keeping compartment 20.

[0200] Referring to Figures 1 and 5-6, the second fresh-keeping compartment 20 is located below the first fresh-keeping compartment 10. The first fresh-keeping compartment 10 includes a first air outlet 13 with an opening facing downwards, and the second fresh-keeping compartment 20 includes a second air inlet 21 with an opening facing upwards. The first air outlet 13 is connected to the second air inlet 21.

[0201] Vertical airflow is achieved by connecting the first air outlet 13 of the first preservation chamber 10 and the second air inlet 21 of the second preservation chamber 20. The vertical layout saves horizontal space, effectively utilizes the longer internal structure of the refrigeration equipment 100, improves the efficiency of internal space utilization, simplifies the connection design of the air path, and facilitates later maintenance and management.

[0202] Furthermore, in the second fresh-keeping compartment 20, the opening of the second drawer 237 faces upwards. The second fresh-keeping compartment 20 is located below the first fresh-keeping compartment 10. The opening of the first air outlet 13 faces downwards, and the opening of the second air inlet 21 faces upwards. The gas flowing into the second air inlet 21 can smoothly and unobstructedly enter the second drawer 237.

[0203] Furthermore, the modified atmosphere module 30 is positioned below the first preservation compartment 10 and arranged approximately side-by-side with the second preservation compartment 20. The modified atmosphere module 30 and the preservation compartments form a relatively independent modular structure with a rational layout, improving the overall design rationality and space utilization of the refrigeration equipment 100. The overall design is more compact, which not only enhances the functional integration of the refrigeration equipment 100 but also facilitates later maintenance and replacement, contributing to the long-term stable operation of the equipment. Therefore, this structure greatly improves the food preservation effect and the overall performance of the equipment.

[0204] The bottom wall of the first cylinder 101 is provided with a first air inlet 11 and a first air return outlet 12. The air outlet 31 is connected to the first air inlet 11, and the air return outlet 32 ​​is connected to the first air return outlet 12. The modified atmosphere module 30 adjusts the oxygen concentration of the first fresh-keeping compartment 10 inside the first cylinder 101 through the air outlet 31 and the air return outlet 32.

[0205] The gas flow path is as follows: After the modified atmosphere module 30 generates gas with a relatively low oxygen concentration, this gas enters the first air inlet 11 through the air outlet 31, then enters the first preservation chamber 10, replacing the gas in the first preservation chamber 10. The replaced gas then passes through the first return air inlet 12 to the return air inlet 32, and then returns to the modified atmosphere module 30. Taking low-oxygen gas as an example, the oxygen concentration gradually increases during the gas transmission process. That is to say, the oxygen concentration of the gas flowing upward from the air outlet 31 is less than the oxygen concentration of the gas flowing downward from the return air inlet 32.

[0206] Furthermore, compared to natural gases in the atmosphere, the lower the oxygen concentration, the lower the gas density, and the higher the oxygen concentration, the higher the gas density. Therefore, the gas output by the modified atmosphere module 30 located below the first preservation chamber 10 is lighter than the gas in the first cylinder 101 above, and naturally tends to flow upward. After being ventilated, it becomes a heavier gas with a higher oxygen concentration, and naturally tends to flow downward.

[0207] Therefore, by arranging the modified atmosphere module 30 below the first preservation chamber 10, an airflow regulation path from bottom to top is achieved. This effectively shortens the gas circulation path, reduces airflow resistance, and allows the regulated gas to enter the first preservation chamber 10 quickly and evenly, forming a closed airflow circulation system to prevent gas leakage and ensure continuous oxygen concentration regulation. On the other hand, natural convection allows the airflow to rise and disperse before sinking to complete the circulation, resulting in a more even distribution of oxygen concentration throughout the chamber.

[0208] In addition, in this embodiment, the refrigeration equipment 100 also includes a leak-proof compartment, in which the controlled atmosphere module 30 is disposed, and the leak-proof compartment isolates the controlled atmosphere module 30 from the refrigeration chamber 90, the first cylinder 101, and the second cylinder 102.

[0209] This prevents the modified atmosphere module 30 from leaking and contaminating the food. By placing the modified atmosphere module 30 separately in the leak-proof compartment, it will not come into contact with the food even if it leaks. If the modified atmosphere module 30 is above the first fresh food compartment 10, the leaked liquid may drip onto the food inside the first fresh food compartment 10. Therefore, by placing the modified atmosphere module 30 in the leak-proof compartment below the first fresh food compartment 10, even if the modified atmosphere module 30 leaks, it will not contaminate the food inside the first drawer 137.

[0210] Additionally, it prevents equipment malfunctions caused by condensate or other liquids entering the controlled atmosphere module 30. This isolation design not only improves equipment safety but also reduces maintenance costs and extends the service life of the controlled atmosphere module 30.

[0211] To reduce the shaking of the modified atmosphere module 30, the distance between the modified atmosphere module 30 and the leak-proof compartment is less than 1mm, or it is supported between the modified atmosphere module 30 and the leak-proof compartment by elastic cushioning material.

[0212] Furthermore, referring to Figures 6 to 10, the refrigeration device 100 also includes a fluid drive 40, which drives the airflow in the first preservation chamber 10 to the second preservation chamber 20. The fluid drive ensures that the airflow can flow along a predetermined path, avoiding stagnation or deviation of the airflow in the chamber, accelerating the oxygen adjustment process, and improving the efficiency of gas regulation, making it particularly suitable for applications that require rapid adjustment of oxygen concentration.

[0213] The fluid drive 40 controls the flow rate and volume of the airflow so that the gas concentration in the second preservation chamber 20 is between the concentration of the corresponding component in the outside and the concentration of the corresponding component in the first preservation chamber.

[0214] The fluid drive unit 40 drives the airflow in the first preservation compartment 10 to blow into the second preservation compartment 20. In the specific oxygen concentration adjustment process, the oxygen concentration in the first preservation compartment 10 can be adjusted first to a lower concentration. Then, under the action of the fluid drive unit 40, the air with a lower oxygen concentration is blown into the second preservation compartment 20. On the one hand, the oxygen concentration in the second preservation compartment 20 will not be lower than that in the first cylinder. On the other hand, by controlling the rotation speed and operating time of the fluid drive unit 40, the second preservation compartment 20 can be adjusted to any value within the range between the atmospheric oxygen concentration and the oxygen concentration in the first preservation compartment 10. This precise adjustment creates different oxygen concentration ranges in the first and second preservation compartments 10, achieving flexible adjustment of different oxygen concentration environments within the same refrigeration equipment 100 at low cost.

[0215] The second cylinder 201 includes an upper wall 2011 and an air guide cover 221. The upper wall 2011 is provided with a groove 721, and the fluid drive component 40 is housed in the groove 721. The air guide cover 221 is fastened to the groove 721, and the groove 721 and the air guide cover 221 enclose an airflow channel 213. The air guide cover 221 includes a second air inlet 21, and the groove 721 includes a ventilation hole 212 facing the second cylinder 201. The second air inlet 21, the airflow channel 213 and the ventilation hole 212 are connected in sequence.

[0216] The air guide cover 221 seals the fluid drive component 40, creating an independent airflow channel 213. This ensures a stable airflow from the first preservation chamber 10 to the second preservation chamber 20, effectively preventing gas leakage around the fluid drive component 40. It also ensures that the oxygen concentration within the airflow channel 213 is not disturbed by external factors, improving oxygen regulation accuracy and overall sealing. Furthermore, enclosing the fluid drive component 40 between the air guide cover 221 and the groove 721 reduces noise during operation and minimizes the impact of vibration on the overall stability of the equipment.

[0217] Furthermore, the fluid drive component 40 is configured as a fan or air pump.

[0218] In this embodiment, the fluid drive component 40 is configured as a centrifugal fan. Utilizing the centrifugal fan's ability to provide strong centrifugal force, it can deliver higher static pressure during high-speed rotation, resulting in smoother airflow within the channel. This allows for the generation of a stable and powerful airflow within a relatively small space, enabling the rapid and uniform distribution of low-oxygen gas in the controlled atmosphere module 30 within the first and second preservation chambers 10, ensuring that the oxygen concentration in the second preservation chamber 20 is quickly adjusted to the desired level. Furthermore, the centrifugal fan can flexibly change the airflow velocity and flow rate by adjusting its rotation speed, thereby more precisely controlling the gas flow between the two chambers.

[0219] As shown in Figure 10, the windward end 41 of the centrifugal fan faces the first air outlet 13, and the air outlet 42 on the side of the centrifugal fan faces the ventilation hole 212.

[0220] The centrifugal fan is positioned in the center of the upper wall, allowing the airflow to diffuse evenly in all directions. This avoids the problem of oxygen concentration being too high or too low in certain areas due to fan misalignment. When this air is blown into the second preservation compartment 20, the airflow forms a stable circulation structure within the second preservation compartment 20, spiraling outwards towards the entire second drawer 237. This improves the uniformity of oxygen within the second preservation compartment 20, ensuring that the gas in every corner of the second drawer 237 can be fully exchanged, thus improving the overall uniformity and efficiency of oxygen regulation.

[0221] The second cylinder 201 also includes a first seal 223, which is sandwiched between the upper wall 2011 and the air guide cover 221. This seal isolates the airflow channel 213 from the refrigerator compartment, preventing irregular airflow. Furthermore, the first seal 223 ensures precise alignment between the air guide cover 221 and the groove 721, preventing gas leakage due to inaccurate alignment. In addition, the first seal 223 helps reduce vibration and noise during fan operation, improving overall user comfort and lifespan.

[0222] Furthermore, as shown in Figure 10, the refrigeration equipment 100 also includes a second sealing element 50, which is sandwiched between the first air outlet 13 and the second air inlet 21. The second sealing element 50 improves the airtightness of the airflow connection between the first preservation compartment 10 and the second preservation compartment 20, preventing unexpected flow of air with different oxygen concentrations at the interface, and effectively ensuring the flow of air from the first preservation compartment 10 to the second preservation compartment 20. In addition, the second sealing element 50 also plays a shock-absorbing role, reducing vibration and noise during airflow, and improving the stability and accuracy of airflow transmission.

[0223] In this embodiment, as shown in the figure, the first air outlet 13 is conical, and its cross-section gradually decreases from bottom to top. The second air inlet 21 is inserted upward into the first air outlet 13. The conical structure ensures a stable insertion structure, making the connection between the first air outlet 13 and the second air inlet 21 tighter, improving sealing performance, reducing the risk of gas leakage at the interface, and thus improving the overall oxygen regulation efficiency of the equipment.

[0224] Referring to Figure 3, both the first air inlet 11 and the first return air inlet 12 are conical. The cross-sections of the first air inlet 11 and the first return air inlet 12 gradually decrease from bottom to top. The air outlet 31 is inserted upward into the first air inlet 11, and the return air inlet 32 ​​is inserted upward into the first return air inlet 12. The conical structure ensures a stable connection, making the connection between the controlled atmosphere module 30 and the preservation compartment tighter, improving sealing performance, reducing the risk of gas leakage at the interface, and thus improving the overall oxygenation efficiency of the equipment.

[0225] Next, referring to Figures 11 and 12, in addition to the second seal 50 between the first air outlet 13 and the second air inlet 21, the refrigeration device 100 also includes a plurality of second seals 50, one of which is sandwiched between the first air inlet 11 and the air outlet 31, and another of which is sandwiched between the first return air outlet 12 and the return air outlet 32.

[0226] Multiple seals enhance the airtightness of the oxygen regulation system, preventing airflow leakage during regulation and ensuring that the regulated oxygen concentration is stably and evenly distributed within the preservation room. This reduces gas loss due to poor sealing and improves the efficiency of oxygen regulation.

[0227] The specific structures of each second seal 50 can be the same or different. Preferably, in this embodiment, the second seal 50 includes a first skirt 51 and a second skirt 52 arranged sequentially from top to bottom, wherein the outer diameter of the first skirt 51 is smaller than the outer diameter of the second skirt 52.

[0228] When the first air outlet 13 is plugged into the second air inlet 21, or the first air inlet 11 is plugged into the air outlet 31, or the first return air inlet 12 is plugged into the air return outlet 32, the first air outlet 13, the first air inlet 11, and the first return air inlet 12 abut against the first skirt 51 and the second skirt 52 of their respective second sealing elements 50. The first skirt 51 and the second skirt 52 enhance the sealing performance of the equipment, preventing air leakage at different interfaces. Furthermore, the first skirt 51 and the second skirt 52 improve the reliability of the connection between the controlled atmosphere module 30 and the first preservation chamber 10, and between the first preservation chamber 10 and the second preservation chamber 20. The dimensional design of the first skirt 51 and the second skirt 52, combined with the conical first air outlet 13, the first air inlet 11, and the first return air inlet 12, greatly enhances the stability and safety of the structure.

[0229] As shown in Figure 12, the air outlet 31, air return outlet 32, and second air inlet 21 each include a limiting bottom wall 214, a pipe wall 215, and a limiting upper wall 216 arranged sequentially from bottom to top. The second sealing element 50 is sleeved on the outer surface of the pipe wall 215 and abuts against the limiting bottom wall 214 and the limiting upper wall 216. This structural design ensures more precise and stable airflow connection, effectively prevents the second sealing element 50 from shifting under the action of airflow, and ensures the stability and sealing of the airflow path during adjustment.

[0230] Next, referring to Figure 13, a first air inlet 11 and a first air return outlet 12 are formed on the bottom wall of the first cylinder 101. The first air inlet 11 is close to the rear wall of the first cylinder 101. The first air return outlet 12 is close to the left / right wall of the first cylinder 101.

[0231] Thus, the modified atmosphere module 30 is positioned below the first cylinder 101. The first air inlet 11 and the first return air inlet 12 formed on the bottom wall of the first cylinder 101 facilitate the connection between the modified atmosphere module 30 and the first preservation compartment 10, ensuring smoother gas flow. The layout design, with the first air inlet 11 near the rear wall 15 of the first cylinder 101 and the first return air inlet 12 near the left / right walls of the first cylinder 101, allows gas to flow along a longer path through the interior of the first cylinder 101, ensuring effective gas coverage of the entire container interior, thereby achieving efficient oxygen regulation.

[0232] By placing the first air inlet 11 near the rear wall 15 of the first cylinder 101 and the first return air inlet 12 near the left / right wall of the first cylinder 101, gas short-circuiting can be effectively prevented.

[0233] The first cylinder 101 also includes a gas guiding structure 167, which guides the gas entering the preservation structure assembly 1 from the first air inlet 11 in a direction away from the first return air inlet 12. By setting the gas guiding structure 167, the gas entering the container can be effectively guided from the first air inlet 11 to an area away from the first return air inlet 12, avoiding short-circuiting of the gas within the preservation structure assembly 1, ensuring that the gas can be evenly distributed and flow through the entire interior of the preservation structure assembly 1, reducing gas retention and ineffective circulation within the container, reducing oxygenation time, and significantly improving oxygenation efficiency.

[0234] Specifically, the air guiding structure 167 includes an air inlet 162 and an air guiding groove 161. The two ends of the air guiding groove 161 are connected to the first air inlet 11 and the air inlet 162, respectively. The preservative gas at the first air inlet 11 enters the interior of the first cylinder 101 through the air guiding groove 161 and then through the air inlet 162. The distance from the air inlet 162 to the first return air inlet 12 is greater than the distance from the first air inlet 11 to the first return air inlet 12. This helps to extend the flow path of the gas into the first cylinder 101, prevent airflow short-circuiting, and prevent the formation of dead corners in the compartment. This design allows the preservative gas to be fully dispersed in the first cylinder 101 before flowing away from the first return air inlet 12, making oxygen regulation more stable and reliable.

[0235] In one embodiment of this application, the cylinder wall of the first cylindrical body 101 (i.e., the outer wall of the first preservation compartment 10) is recessed to form a groove, the groove including a first groove end 1311 communicating with the first air inlet 11. The groove also includes a second groove end 1312 away from the first return air inlet 12. The air guiding structure 167 includes a groove cover 132 covering the groove. At the groove, the cylinder wall of the first cylindrical body 101 and the groove cover 132 form an air guiding groove 161. An air inlet hole 162 is formed on the groove cover 132 or the wall of the air guiding groove 161 near the second groove end 1312.

[0236] The design of the air guide groove 161 ensures that after the gas enters the first air inlet 11, it flows along the air guide groove 161 first, ensuring that the gas can be guided in an orderly manner to an area away from the first return air inlet 12, thus preventing the gas from flowing back to the first return air inlet 12 immediately after entering the first preservation chamber 10, thereby achieving full circulation and distribution of the gas.

[0237] The air guide groove 161 is formed by recessing it into the wall of the first cylinder 101, resulting in a stable and durable structure. This one-piece molding design utilizes the modification of the container wall itself, reducing additional components and simplifying the complexity of molds and manufacturing processes. This not only reduces production steps but also lowers production costs and improves production efficiency, making the production process simpler and more efficient. Furthermore, the air guide groove 161 is integrated into the wall of the first cylinder 101, embedding it into the container wall and minimizing space occupation.

[0238] In this embodiment, the air guide groove 161 is formed by an inward recess in the wall of the first cylinder 101. The groove cover 132 is disposed on the outside of the first cylinder 101. The complete air guide groove 161 can be formed through simple installation, reducing the complexity of manufacturing and assembly; when inspection or maintenance is required, operators can easily remove or replace the groove cover 132, reducing the complexity of maintenance operations and improving the convenience of maintenance.

[0239] In one embodiment, the gas guiding structure 167 further includes a sealing strip 172 disposed between the groove cover 132 and the cylinder wall of the first cylinder 101. The sealing strip 172 may be annular and may be made of materials such as rubber. The sealing strip 172 is used to seal the gap between the groove cover 132 and the cylinder wall of the first cylinder 101. The design of the sealing strip 172 effectively fills the gap between the groove cover 132 and the cylinder wall of the first cylinder 101, ensuring the airtightness of the entire gas guiding groove. Through the sealing strip 172, gas leakage at the connection between the gas guiding groove 161 and the groove cover 132 can be prevented.

[0240] In this embodiment, the cylinder wall used to set the air guiding structure 167 is specifically the rear wall 15 of the first cylinder 101, so as not to affect the aesthetics and the loading and unloading of items.

[0241] Preferably, the distance between the air inlet 162 and the first return air inlet 12 is greater than 1.5*L. L is the sum of the diameters of the first air inlet 11 and the first return air inlet 12. When the cross-sections of the first air inlet 11 and the first return air inlet 12 are circular, the sum of their diameters is also the sum of their maximum span dimensions. When the cross-sections of the first air inlet 11 and the first return air inlet 12 are not circular, the sum of their diameters is also the sum of their maximum span dimensions.

[0242] When the distance between the air inlet 162 and the first return air inlet 12 is too close, gas may enter the container from the first air inlet 11 and flow directly to the first return air inlet 12, causing some gas to fail to diffuse effectively and resulting in a short circuit. This will affect the uniform distribution of gas inside the preservation structure component 1, thereby reducing oxygen regulation efficiency. By designing the distance between the air inlet 162 and the first return air inlet 12 to be greater than 1.5 times L, short-circuit flow of gas can be effectively avoided, forcing the gas to travel a longer path inside the container, thus achieving better uniform distribution.

[0243] Referring to Figure 14, the rear wall of the first drawer 137 has a first opening 1372 that mates with the air inlet 162, and the bottom wall and left / right walls of the first drawer 137 have a second front opening 1373 that mates with the first return air vent 12.

[0244] Referring to Figure 15, in one embodiment, the preservation structure component 1 includes a baffle plate 135 disposed between the first air inlet 11 and the first return air inlet 12. Thus, the baffle plate 135 forms a modified air guiding structure 167. The baffle plate 135 effectively prevents gas from flowing directly from the first air inlet 11 to the first return air inlet 12. By guiding the gas flow within the first preservation chamber 10 through the baffle plate 135, the gas can be distributed more evenly, thereby ensuring a more balanced oxygen concentration in each area and improving the overall oxygen regulation effect.

[0245] In one embodiment of this application, the wind deflector 135 and the cylinder wall of the first cylinder 101 form a wind deflector channel 1351. The air inlet end 1352 of the wind deflector channel 1351 is connected to the first air inlet 11. The air outlet end 1353 of the wind deflector channel 1351 is away from the first return air inlet 12.

[0246] The windbreak channel 1351 formed by the baffle plate 135 and the cylinder wall of the first cylinder 101 can forcibly guide the gas to flow along a set path, preventing the gas from flowing directly from the first air inlet 11 to the first return air inlet 12. Since the air inlet 1352 and the air outlet 1353 are located at different positions, the gas must flow along the windbreak channel 1351 to ensure that the gas passes through multiple areas within the first preservation chamber 10. This design effectively prevents direct backflow of gas, thereby ensuring uniform gas distribution within the container and improving oxygen regulation. The design of the windbreak channel 1351 is relatively simple and can be achieved through the modular installation of the baffle plate 135. This design facilitates production, assembly, and subsequent maintenance, reducing production costs.

[0247] In addition, as shown in the figure, the first air inlet 11, the first return air inlet 12, and the first air outlet 13 are all located at the bottom of the first fresh-keeping compartment 10. In this way, the fresh-keeping gas is blown downward into the second fresh-keeping compartment 20 after fully filling the space in the first fresh-keeping compartment 10. The arrangement of the first air inlet 11, the first return air inlet 12, and the first air outlet 13 does not affect the pushing and pulling of the first drawer 137.

[0248] In this embodiment, only the preservative gas is blown from the first preservation chamber 10 to the second preservation chamber 20. There are no other air vents in the second preservation chamber 20. Gas with a lower oxygen concentration is blown in, forcing the gas with a higher oxygen content inside out through the gaps into the refrigeration chamber 90. The air pressure inside the second preservation chamber 20 will not increase excessively. The fluid drive component 40 ensures that the preservative gas is blown into the second preservation chamber 20 more forcefully.

[0249] [Second Embodiment]

[0250] As shown in Figure 16, the refrigeration equipment 100 in the second embodiment of this application differs from that in the first embodiment only in that the second preservation chamber 20 further includes a second return air inlet 22, which is connected to the return air inlet 32.

[0251] The second embodiment adds a second return air vent 22 to the second preservation chamber 20, enabling the preservation gas to form a circulation loop similar to that of the first preservation chamber 10 within the second preservation chamber 20. This dual-loop design further improves the efficiency of gas concentration regulation, ensuring that the gas concentration in both preservation chambers can be precisely controlled. It is particularly suitable for foods requiring long-term preservation, as it can maintain the stability of gas concentration through return air circulation.

[0252] Apart from the above, the second embodiment is the same as the first embodiment and will not be described again.

[0253] [Third Embodiment]

[0254] As shown in Figure 17, the refrigeration equipment 100 in the third embodiment of this application differs from that in the first embodiment only in that: the first fresh-keeping compartment 10 further includes a third air inlet 14, and the second fresh-keeping compartment 20 further includes a second air outlet 23, which is connected to the third air inlet 14.

[0255] The third embodiment features multiple air inlets and outlets between the two preservation chambers, forming two air paths to ensure sufficient circulation and flow of the preservation gas. This design is particularly suitable for preservation applications requiring continuous gas exchange, such as for foods that need rapid temperature or humidity reduction. Low-oxygen gas blown from the first preservation chamber 10 into the second preservation chamber 20 via the first outlet 13 can return to the first preservation chamber 10 via the third air inlet 14, facilitating gas flow. Through multiple gas channels, the device can more effectively regulate the gas concentration and temperature within the chambers, further enhancing the preservation effect.

[0256] It is understandable that the fan 40 is omitted in the figure, and the third embodiment can include the fan 40 or omit it.

[0257] Apart from the above, the third embodiment is the same as the first embodiment and will not be described again.

[0258] [Fourth Embodiment]

[0259] As shown in Figures 18 to 20, the refrigeration equipment 100 in the fourth embodiment of this application differs from that in the first embodiment in that: the first fresh-keeping compartment 10 no longer has a first return air inlet 12, but still retains the first air inlet 11 and the first air outlet 13; the second fresh-keeping compartment 20 adds a second return air inlet 22, which is connected to the return air inlet 32.

[0260] In Figure 21, a second return air vent 22 is provided on the right side of the second fresh-keeping compartment 20, that is, on the side close to the controlled atmosphere module 30. The controlled atmosphere module 30 is provided with a return air vent 32 facing the second fresh-keeping compartment 20, and the second return air vent 22 is connected to the return air vent 32.

[0261] The difference between the fourth embodiment and the first embodiment is that in the first embodiment, the first preservation chamber 10 and the modified atmosphere module 30 form two air paths, one inlet and one outlet. In the fourth embodiment, the first preservation chamber 10 does not simultaneously perform the functions of air intake and return (only one air intake path is retained). Instead, an air path is added between the second preservation chamber 20 and the modified atmosphere module 30 so that the second preservation chamber 20 can perform the function of return air. The preservation gas is blown from the modified atmosphere module 30 into the first preservation chamber 10, then into the second preservation chamber 20, and then back to the modified atmosphere module 30 to complete the cycle. This ensures that the gas concentration in each chamber is almost the same, which can avoid the problem of uneven gas concentration, especially in scenarios where multiple chambers need to have the same oxygen concentration.

[0262] Apart from the above, the fourth embodiment is the same as the first embodiment and will not be described again.

[0263] [Fifth Embodiment]

[0264] As shown in Figure 21, in the refrigeration equipment 100 of the fifth embodiment of this application, the modified atmosphere module 30 adjusts the gas concentration inside the first preservation chamber 10 to be higher than the concentration of the corresponding component in the outside environment. Specifically, the oxygen concentration can be higher than the oxygen concentration in the outside environment. Oxygen can inhibit the growth of anaerobic bacteria, thereby extending the preservation time of meat. Of course, it can also be changed to adjust the gas concentration inside the first preservation chamber 10 to be lower than the concentration of the corresponding component in the outside environment.

[0265] The first fresh-keeping compartment 10 includes a first air inlet 11 and a first air outlet 13. The second fresh-keeping compartment 20 includes a second air inlet 21. The air outlet 31 is connected to the first air inlet 11, and the first air outlet 13 is connected to the second air inlet 21.

[0266] The difference between the fifth embodiment and the first embodiment is that, in a high-oxygen environment, the fresh-keeping gas output from the outlet 31 of the modified atmosphere module 30 can be pure oxygen. Once oxygen is introduced into the fresh-keeping compartment, regardless of the amount, it can quickly increase the oxygen concentration in the compartment. Therefore, there is no need for a return air design. In Figure 21, the gas only needs to flow from the modified atmosphere module 30 into the first fresh-keeping compartment 10 and the second fresh-keeping compartment 20 in sequence.

[0267] Therefore, in this embodiment, compared to the first embodiment, one air passage between the first preservation chamber 10 and the modified atmosphere module 30 is removed, and only the air outlet 31 and the first air inlet 11 are retained. Furthermore, in terms of the internal structure of the modified atmosphere module 30, the air outlet 31 is not connected to the outside of the modified atmosphere unit inside the housing 301 as in the first embodiment, but is connected to the inner cavity of the modified atmosphere unit to collect oxygen formed in the inner cavity.

[0268] In addition, since the oxygen purity entering the second preservation compartment 20 is lower than that entering the first preservation compartment 10, the oxygen concentration in the first preservation compartment 10 is naturally higher than that in the second preservation compartment 20. This creates a stable oxygen gradient between the preservation compartments. Then, each compartment is filled with food with the most suitable oxygen concentration. Through a simple pipeline design, the storage environment requirements of different foods are met, satisfying the preservation needs of meat and other foods that require a high oxygen environment.

[0269] Apart from the above, the fifth embodiment is the same as the first embodiment and will not be described again.

[0270] [Sixth Embodiment]

[0271] As shown in Figure 22, in the refrigeration equipment 100 of the sixth embodiment of this application, the modified atmosphere module 30 is housed in the first preservation chamber 10. The modified atmosphere module 30 also includes an air inlet 33 and an air outlet 34. The air outlet 31 discharges preservation gas into the first preservation chamber 10. The air inlet 33 and the air outlet 34 are connected to external gas or other preservation chambers (such as the fourth preservation chamber).

[0272] By directly housing the modified atmosphere module 30 within the first preservation chamber 10, the efficiency of gas concentration regulation is further improved, and potential gas loss during flow is reduced, ensuring that the preservative gas can act on the food quickly and efficiently. Simultaneously, the air inlet 33 and exhaust outlet 34 of the modified atmosphere module 30 are connected to the outside environment, ensuring a continuous supply of fresh air during operation and maintaining the stability of the gas composition.

[0273] The modified atmosphere module 30 adjusts the gas concentration inside the first preservation chamber 10 to be higher than the concentration of the corresponding components in the outside environment. Specifically, the oxygen concentration can be higher than the oxygen concentration in the outside environment. Oxygen can inhibit the growth of anaerobic bacteria, thereby extending the shelf life of meat. Of course, it can also be changed to adjust the gas concentration inside the first preservation chamber 10 to be lower than the concentration of the corresponding components in the outside environment.

[0274] In a high-oxygen environment, the fresh-keeping gas output from the outlet 31 of the modified atmosphere module 30 can be pure oxygen. Once the oxygen is introduced into the fresh-keeping compartment, regardless of the amount, it can quickly increase the oxygen concentration in the compartment. Therefore, there is no need for a return air design. In Figure 22, the gas only needs to flow from the modified atmosphere module 30 into the first fresh-keeping compartment 10 and the second fresh-keeping compartment 20 in sequence.

[0275] Therefore, in this embodiment, from the perspective of the internal structure of the modified atmosphere module 30, the air outlet 31 is not connected to the outside of the modified atmosphere unit inside the housing 301 as in the first embodiment, but is connected to the inner cavity of the modified atmosphere unit to collect the oxygen formed in the inner cavity.

[0276] Apart from the above, the sixth embodiment is the same as the first embodiment and will not be described again.

[0277] [Seventh Embodiment]

[0278] As shown in Figure 23, the refrigeration device 100 of the seventh embodiment of this application differs from that of the first embodiment in that: an additional third fresh-keeping compartment 60 is added, and the third fresh-keeping compartment 60 is connected in series with the first fresh-keeping compartment 10 or the second fresh-keeping compartment 20.

[0279] The third preservation chamber 60 can be the third, fourth, or even the Nth preservation chamber, expanding the equipment's gas regulation capabilities. The third preservation chamber 60 is connected to the second preservation chamber 20. On one hand, this allows the equipment to create different gas concentration distributions in multiple preservation chambers. Taking low-oxygen gas as an example, the oxygen concentration is in the order of first preservation chamber 10 < second preservation chamber 20 < third preservation chamber 60 < outside, further enhancing the equipment's preservation capabilities and meeting more diverse food needs. On the other hand, this series-connected gas regulation structure can be further extended to achieve multi-stage series connection, adjusting the gas concentration in each preservation chamber with very low piping layout complexity. This design ensures that the equipment can still provide simple and precise multi-stage gas control even in multi-chamber configurations.

[0280] Apart from the above, the seventh embodiment is the same as the first embodiment and will not be described again.

[0281] [Eighth Embodiment]

[0282] As shown in Figure 24, the refrigeration device 100 of the eighth embodiment of this application differs from that of the first embodiment in that: the third fresh-keeping compartment 60 among the multiple fresh-keeping compartments includes a fifth air inlet and a fifth air outlet. The fifth air inlet is connected to the air outlet 31 of the controlled atmosphere module 30 or the second air outlet of the controlled atmosphere module 30 (as shown in the figure), and the fifth air outlet is connected to the air return port 32 of the controlled atmosphere module 30 or the second air return port of the controlled atmosphere module 30 (as shown in the figure). That is to say, in more embodiments, some of the multiple fresh-keeping compartments of the refrigeration device 100 can be connected in series and some in parallel. For example, multiple fresh-keeping compartments are directly connected to the controlled atmosphere module 30. Taking low-oxygen gas as an example, the oxygen concentration is in the order of first fresh-keeping compartment 10 = third fresh-keeping compartment 60 < second fresh-keeping compartment 20 < outside, which meets more diverse food needs.

[0283] Compared with commonly used technologies, this embodiment, like the first to seventh embodiments above, has the following beneficial effects:

[0284] By improving the structure and gas path design of the refrigeration equipment 100, multiple preservation compartments are connected in series. The gas concentration changes with the first preservation compartment 10, affecting the gas concentration of other preservation compartments. This achieves dynamic and flexible adjustment, eliminating the need for the controlled atmosphere module 30 to regulate each preservation compartment with independent piping and control structures. This allows for the adjustment of gas concentration in each preservation compartment with very low piping layout complexity. In addition, a stable gas gradient can be formed between the preservation compartments, meeting the different preservation environment requirements of different foods in the same equipment. This improves the preservation performance of the equipment, reduces production and control costs, and provides users with a more flexible user experience.

[0285] Apart from the above, the eighth embodiment is the same as the first embodiment and will not be described again.

[0286] [Ninth Embodiment]

[0287] Referring to Figures 25-29, the differences between this ninth embodiment and the first embodiment described above are as follows: Content not described herein is the same as in the first embodiment.

[0288] In this embodiment, the first preservation compartment 10 and the second preservation compartment 20 are not connected in series, but are independently connected to the modified atmosphere module 30.

[0289] The modified atmosphere module 30 includes a third air outlet 38 and a third air return outlet 39. The modified atmosphere module 30 adjusts the oxygen concentration in the second fresh-keeping compartment 20 through the third air outlet 38 and the third air return outlet 39. The oxygen concentration in the second fresh-keeping compartment 20 is lower than the outside oxygen concentration and higher than the oxygen concentration in the first fresh-keeping compartment 10.

[0290] The difference from the first embodiment is that the oxygen concentration adjustment in the second preservation chamber 20 does not depend on the first preservation chamber 10, but is directly supplied with preservation gas by the modified atmosphere module 30. This allows for more precise oxygen concentration control in different chambers, meeting the different oxygen concentration requirements of each chamber, and enabling the equipment to maintain efficient and stable oxygen regulation in complex environments, thereby improving the overall functionality and flexibility of the equipment.

[0291] The second fresh-keeping compartment 20 contains a second drawer 237. The cylinder wall 2012 of the second cylinder 201 is provided with a guide air duct 29. The second fresh-keeping compartment 20 includes an airflow channel 303 and a accommodating space 302. The airflow channel 303 is formed in the guide air duct 29 outside the cylinder wall 2012 of the second cylinder 201, and the accommodating space 302 is surrounded by the cylinder wall 2012 of the second cylinder 201.

[0292] Ventilation holes are provided on the wall 2012 of the second cylinder 201. The third air outlet 38 is connected to the airflow channel 303, and the third air return port 39 is connected to the accommodating space 302. The airflow blown out from the third air outlet 38 passes through the airflow channel 303, the ventilation holes, and the accommodating space 302 in sequence before reaching the third air return port 39. The airflow process from the controlled atmosphere module 30 to the second cylinder 201 is shown in Figures 26 and 27, and the airflow process from the second cylinder 201 back to the controlled atmosphere module 30 is shown in Figures 28 and 29.

[0293] The cylinder wall 2012 of the second cylinder 201 divides the second preservation chamber 20 into an airflow channel 303 and a accommodating space 302. Gas flows unidirectionally only through ventilation holes, ensuring that the gas flows along a predetermined path, improving gas flow efficiency and preventing airflow short-circuiting. This design significantly improves the uniformity of oxygen concentration regulation within the chamber, ensuring the overall oxygen regulation effect of the equipment.

[0294] Apart from the above, the ninth embodiment is the same as the first embodiment and will not be described again.

[0295] [Tenth Embodiment]

[0296] Referring to Figures 30-31, the tenth embodiment differs from the ninth embodiment described above in the following aspects: the specific shapes of the first air inlet 11, the first return air inlet 12, the air outlet 31, and the return air inlet 32.

[0297] As shown in the figure, the cross-sections of the first air inlet 11, the first return air inlet 12, the air outlet 31, and the return air inlet 32 ​​are all set to square. The air outlet 31 is inserted into the first air inlet 11, and the return air inlet 32 ​​is inserted into the first return air inlet 12.

[0298] Each docking interface is designed in a square shape, which improves the stability of the oxygen control system. The square interface design not only increases the contact area of ​​the airflow, but also makes the docking between the interfaces more stable, effectively preventing gas leakage at the interface.

[0299] Multiple snap-fit ​​tabs 25 are installed in the first preservation chamber 10. One snap-fit ​​tab 25 is engaged between the air outlet 31 and the first air inlet 11 to prevent separation between them; another snap-fit ​​tab 25 is engaged between the return air outlet 32 ​​and the first return air outlet 12 to prevent separation between them. The design of the snap-fit ​​tabs 25 further ensures the connection stability between the interfaces and avoids displacement or separation of the interfaces under airflow pressure. This design significantly improves the airflow sealing and regulation efficiency of the equipment, ensuring the accuracy and continuity of oxygen concentration regulation.

[0300] First, insert the air outlet 31 and the air return port 32 into the first cylinder 101. At this time, the square air outlet 31 and the air return port 32 are both exposed above the bottom wall of the first cylinder 101 in the first preservation chamber 10. Then, insert the retaining clips 25. The retaining clips 25 have a U-shaped structure, and the outer diameter of the retaining clips 25 is larger than the outer diameter of the air outlet 31 and the first air inlet 11. After the retaining clips 25 are inserted, the modified atmosphere module 30 is fixed. The retaining clips 25 facilitate both installation and disassembly and maintenance.

[0301] Compared with the prior art, this embodiment has the following beneficial effects: by setting the modified atmosphere module 30 below the first fresh-keeping chamber 10, a vertically connected airflow path structure is formed. The regulated gas can directly enter the fresh-keeping chamber from below. Through natural rising and dispersed flow, the oxygen concentration in the entire chamber can be more evenly distributed. Moreover, the modified atmosphere module 30 and the fresh-keeping chamber form a relatively independent modular structure with a reasonable layout, which improves the overall design rationality and space utilization of the refrigeration equipment 100, and greatly improves the food preservation effect and the overall performance of the equipment.

[0302] Apart from the above, the tenth embodiment is the same as the ninth embodiment and will not be described again.

[0303] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0304] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A refrigeration device, characterized in that, include: Multiple fresh-keeping compartments, including a first fresh-keeping compartment and a second fresh-keeping compartment; The modified atmosphere module includes an outlet for outputting preservative gas, a first preservation chamber connected to the outlet, and airflow communication between the first and second preservation chambers. The concentration of preservative gas in the second preservation chamber varies with the concentration of preservative gas in the first preservation chamber.

2. The refrigeration equipment according to claim 1, characterized in that, The first fresh-keeping compartment is connected to the second fresh-keeping compartment in series, and the airflow output from the modified atmosphere module passes through the first fresh-keeping compartment and then reaches the second fresh-keeping compartment.

3. The refrigeration equipment according to claim 2, characterized in that, The gas concentrations used to adjust the preservation gas output by the modified atmosphere module include oxygen concentration, carbon dioxide concentration, water vapor concentration, nitrogen concentration, oxygen and water vapor concentration, or carbon dioxide and water vapor concentration.

4. The refrigeration equipment according to claim 3, characterized in that, The modified atmosphere module adjusts the gas concentration inside the first preservation room to be lower or higher than the concentration of the corresponding component in the outside environment.

5. The refrigeration equipment according to claim 2, characterized in that, The first preservation chamber includes a first air inlet and a first air outlet, and the second preservation chamber includes a second air inlet. The air outlet is connected to the first air inlet, and the first air outlet is connected to the second air inlet.

6. The refrigeration equipment according to claim 5, characterized in that, The modified atmosphere module includes a return air port; The first fresh-keeping compartment includes a first return air vent, which is connected to the return air inlet; and / or, the second fresh-keeping compartment further includes a second return air vent, which is connected to the return air inlet; and / or, the first fresh-keeping compartment further includes a third air inlet, and the second fresh-keeping compartment further includes a second air outlet, which is connected to the third air inlet.

7. The refrigeration equipment according to claim 5, characterized in that, The plurality of preservation compartments further includes a third preservation compartment, which is connected in series with the first or second preservation compartment via airflow.

8. The refrigeration equipment according to claim 7, characterized in that, The modified atmosphere module includes a return air port; The first preservation room includes a first return air vent, which is connected to the return air inlet; The third preservation chamber is connected to the second preservation chamber to introduce preservation gas from the second preservation chamber; And / or, the third preservation compartment includes a fifth air inlet and a fifth air outlet, the fifth air inlet being connected to the air outlet of the modified atmosphere module or the second air outlet of the modified atmosphere module, and the fifth air outlet being connected to the air return port of the modified atmosphere module or the second air return port of the modified atmosphere module.

9. The refrigeration equipment according to claim 2, characterized in that, The modified atmosphere module is housed in the first preservation room, and the air outlet discharges preservation gas from the first preservation room. The first preservation compartment includes a first air outlet, and the second preservation compartment includes a second air inlet, with the first air outlet and the second air inlet connected together.

10. The refrigeration equipment according to claim 9, characterized in that, The modified atmosphere module also includes an air inlet and an exhaust outlet, which are connected to the outside gas in the first preservation chamber.

11. The refrigeration equipment according to claim 2, characterized in that, The refrigeration equipment also includes a fluid drive component, which drives the airflow in the first preservation chamber to blow towards the second preservation chamber.

12. The refrigeration equipment according to claim 11, characterized in that, The fluid drive unit controls the airflow speed or flow rate so that the gas concentration in the second preservation chamber is between the concentration of the corresponding component in the outside and the concentration of the corresponding component in the first preservation chamber. The fluid drive component is configured as a fan or an air pump.

13. The refrigeration equipment according to claim 11, characterized in that, The second fresh-keeping compartment is located below the first fresh-keeping compartment. The first fresh-keeping compartment includes a first air outlet with an opening facing downwards, and the second fresh-keeping compartment includes a second air inlet with an opening facing upwards. The first air outlet is connected to the second air inlet.

14. The refrigeration equipment according to claim 13, characterized in that, The refrigeration equipment includes a second cylinder and an air guide cover. The second preservation compartment is formed in the second cylinder. A groove is provided on the upper wall of the second cylinder. The air guide cover is fastened to the groove. The groove and the air guide cover enclose an airflow channel. The fluid drive component is housed in the groove and located in the airflow channel. The second air inlet is disposed on the air guide cover, and the groove includes a ventilation hole facing the second cylinder. The second air inlet, the airflow channel and the ventilation hole are connected in sequence.

15. The refrigeration equipment according to claim 13, characterized in that, The refrigeration equipment includes a first cylinder, and a first fresh-keeping compartment is formed inside the first cylinder; the modified atmosphere module is disposed below the first fresh-keeping compartment and is arranged side by side with the second fresh-keeping compartment.

16. The refrigeration equipment according to claim 15, characterized in that, The first preservation chamber has a first air inlet and a first air return outlet disposed on the bottom wall of the first cylinder; The modified atmosphere module includes an air outlet and an air return outlet. The air outlet is vertically connected to the first air inlet, and the air return outlet is vertically connected to the first air return outlet. The refrigeration equipment also includes multiple sealing elements, which are clamped at any position between the first air inlet and the air outlet, between the first return air inlet and the return air outlet, and between the first air outlet and the second air inlet.

17. The refrigeration equipment according to claim 16, characterized in that, The first air inlet, the first return air inlet, and the first air outlet are each conical, and their cross-sections gradually decrease from bottom to top. The air outlet is inserted into the first air inlet, the return air inlet is inserted into the first return air inlet, and the second air inlet is inserted into the first air outlet. The sealing element includes a first skirt and a second skirt arranged sequentially from top to bottom. The outer diameter of the first skirt is smaller than the outer diameter of the second skirt. The first air inlet, the first air return outlet, and the first air outlet each abut against the first skirt and the second skirt of the corresponding sealing element.

18. The refrigeration equipment according to claim 16, characterized in that, The first cylinder wall is provided with an air inlet and an air guide groove. The two ends of the air guide groove are respectively connected to the first air inlet and the air inlet. The fresh-keeping gas at the first air inlet enters the interior of the first cylinder through the air guide groove and the air inlet. The distance from the air inlet to the first return air outlet is greater than the distance from the first air inlet to the first return air outlet.

19. The refrigeration equipment according to claim 18, characterized in that, The distance between the air inlet and the first return air outlet is greater than 1.5*L, where L is the sum of the diameters of the first air inlet and the first return air outlet.

20. The refrigeration equipment according to claim 18, characterized in that, The first cylinder includes a groove cover, and the cylinder wall of the first cylinder and the groove cover surround to form the air guide groove.

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