WO2018103731A1

WO2018103731A1 - Refrigerating and freezing device having air-regulating fresh-keeping function

Info

Publication number: WO2018103731A1
Application number: PCT/CN2017/115154
Authority: WO
Inventors: 娄喜才; 朱小兵; 王胜飞; 王磊
Original assignee: 青岛海尔股份有限公司
Priority date: 2016-12-09
Filing date: 2017-12-08
Publication date: 2018-06-14
Also published as: CN106679276B; CN106679276A

Abstract

A refrigerating and freezing device having an air-regulating fresh-keeping function comprises a box body (20) in which a storage space is defined, and comprises an air-regulating fresh-keeping subspace (271), an air-regulating fresh-keeping system (80) and a working condition detection system (70) that are formed in the storage space. The air-regulating fresh-keeping system (80) comprises an air-regulating membrane assembly (30) and an air extracting pump (40). The air extracting pump (40) is configured to make the gas in the air-regulating fresh-keeping subspace (271) permeate through the air-regulating membrane assembly (30), so that a gas atmosphere favorable for food preservation is formed in the air-regulating fresh-keeping subspace (271). The working condition detection system (70) is configured to detect the working states of the air-regulating membrane assembly (30) and the air extracting pump (40), and outputs prompt information when the working states are abnormal.

Description

Refrigerated freezer with modified atmosphere preservation function

The present application claims the priority of the Chinese Patent Application No. 201611132093.9, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in in.

Technical field

The invention relates to the field of storage technology, in particular to a refrigerating and freezing device with a modified atmosphere preservation function.

Background technique

Food is the source of energy for people to survive and is vital to people. For food storage, the two main aspects are heat preservation and preservation. Generally speaking, temperature has a significant effect on the microbial activity on food and the action of enzymes in food. The decrease in temperature will delay the deterioration of food, and the refrigerator will remain constant. A low-temperature refrigeration device is also a civilian product that keeps food or other items at a constant low temperature.

With the improvement of the quality of life, consumers are increasingly demanding the preservation of stored foods, especially the requirements for the color and taste of foods. Therefore, the stored food should also ensure that the color, taste, freshness, etc. of the food remain as constant as possible during storage. Therefore, users have put forward higher requirements for the preservation technology of refrigerators and freezers such as refrigerators.

In the prior art, the fresh-keeping technology of the refrigerator and the like of the refrigerator mainly adopts a vacuum preservation technology, and a sealing device is arranged in the storage space, and the consumer needs to perform a vacuuming operation every time the food is stored, and the part of the air in the packaging container is excluded ( Oxygen) destroys the conditions in which bacteria and microorganisms breed, thus effectively preventing food spoilage.

The vacuum storage compartment is used for fresh-keeping. Because the box body is a rigid structure, it is required to maintain a vacuum state. The vacuum system is highly demanded, and the sealing performance of the refrigerator is very high. Each time an item is taken, a new one is poured in. More air, the consumption of energy in the refrigerator is greater. Due to the high requirements of the vacuum preservation storage compartment, the work reliability is low, and damage is likely to occur, which brings great inconvenience to the user.

Summary of the invention

An object of the present invention is to provide a refrigerating and freezing apparatus having a high-reliability and good fresh-keeping effect and having a modified atmosphere.

In particular, the present invention provides a refrigerating and freezing device having a modified atmosphere fresh-keeping function, comprising: a box body defining a storage space therein, and a sealed atmosphere-preserving sub-space formed in the storage space; The system comprises a gas regulating membrane module and an air pump, wherein the air pump is configured to infiltrate the gas of the modified air conditioning sub-space through the air-conditioning membrane module to form a gas atmosphere for food preservation in the atmosphere-preserving sub-space of the storage space. And a condition detection system configured to detect the working state of the gas regulating membrane module and the air pump, and output a prompt message when an abnormality occurs in the working state.

Optionally, the condition detection system includes an air pump detection subsystem, and the air pump detection subsystem includes: an air pump speed sensor configured to measure a speed of the air pump; and an air pump diagnostic device configured to determine whether the air pump speed is The speed threshold of the pump is exceeded, and if so, the pump failure is determined and a message indicating the pump failure is output.

Optionally, the air pump detection subsystem further includes: an air pump temperature sensor configured to measure the pumping The operating temperature of the air pump, and the pump diagnostic device, is further configured to determine the pump failure when the operating temperature of the pump exceeds the temperature threshold and output a message indicating a pump failure.

Optionally, the air pump detection subsystem further includes: an air pump intake air flow sensor configured to measure an intake air flow of the air pump; and an air pump exhaust flow sensor configured to measure an exhaust flow rate of the air pump, and the air pump The diagnostic device is further configured to compare the intake flow rate and the exhaust flow rate, and if the exhaust flow rate exceeds the preset threshold of the intake air flow rate, if so, determine that the air pump has a gas leakage hazard and output information indicating that the air pump leaks.

Optionally, the condition detection system further includes a gas regulating membrane module detecting subsystem, and the gas regulating membrane module detecting subsystem comprises: a gas regulating membrane module detecting device configured to determine whether the pumping flow of the air pump exceeds a preset number If the exhaust gas flow threshold is exceeded, it is determined that the gas regulating membrane module is damaged, and the output prompts that the gas regulating membrane module needs to be damaged.

Optionally, the gas regulating membrane module detecting device is further configured to: determine whether the pumping flow rate of the air pump is less than a preset second pumping air flow threshold, and if yes, determine that the air conditioning membrane module is stained, and output a prompt air conditioning film The information of the component fouling is that the second pumping flow threshold is less than the first pumping flow threshold.

Optionally, the refrigerating and freezing device further includes: an oxygen concentration sensor disposed in the modified atmosphere sub-space, and configured to detect an oxygen concentration in the modified atmosphere sub-space; and the gas-conditioning membrane module detecting device is further configured to: After the modified atmosphere freshening system is started, the decreasing speed of the oxygen concentration is determined according to the detected value of the oxygen concentration sensor, and is compared with the preset first air-conditioning speed and the second air-conditioning speed respectively, if the oxygen concentration decreases faster than the first The air-conditioning speed determines that the air-conditioning membrane module works normally; if the oxygen concentration decreases faster than the first air-conditioning speed and is greater than the second air-conditioning speed, the prompt message indicating that the air-conditioning membrane module needs to be replaced is output; if the oxygen concentration is If the descending speed is lower than the second air-conditioning speed, the prompt message indicating that the air-conditioning membrane module is damaged is output, and the first air-conditioning speed is greater than the second air-conditioning speed.

Optionally, the refrigerating and freezing device further includes: a gas-tight sealed drawer disposed in the storage space and defining a modified air-preserving sub-space, and the air-conditioned sealed drawer includes: a drawer cylinder having a forward opening and disposed on the a drawer body slidably mounted in the drawer body to be operatively extracted outwardly and inwardly from a forward opening of the drawer body, and the end plate of the drawer body and the forward direction of the drawer body The opening forms a sealed structure, and the inside of the drawer body forms a gas-conditioned fresh-keeping sub-space.

Optionally, the refrigerating and freezing device further includes: a receiving cavity disposed in the top wall of the drawer cylinder and communicating with the fresh-keeping subspace for arranging the air-conditioning membrane module; the receiving cavity of the top wall of the drawer cylinder and the air-conditioned preservative At least one first vent hole and at least one second vent hole spaced apart from the at least one first vent hole are defined in the wall between the spaces to respectively connect the accommodating cavity and the modified atmosphere sub-space at different positions; the refrigerating and freezing device A fan is also included, the fan being disposed within the receiving chamber to facilitate formation of a flow of gas sequentially through the at least one first vent, the receiving chamber, and the at least one second vent and back to the modified air sub-space.

Optionally, the refrigerating and freezing apparatus further includes: a storage space opening and closing detecting device configured to detect a state in which the storage space is opened and closed; and an air-conditioning fresh-keeping sub-space opening and closing detecting device configured to detect that the modified air-conditioning sub-space is opened And the state of the shutdown.

The refrigerating and freezing device with the modified atmosphere fresh-keeping function of the present invention creatively proposes to use a gas regulating membrane (for example, an oxygen-rich membrane) module to discharge oxygen in the air in the closed atmosphere-preserving sub-space into the space. Thereby, a nitrogen-rich oxygen-poor or other gas atmosphere for food preservation is obtained in the space. For example, the nitrogen-rich and oxygen-poor gas atmosphere can reduce the oxygen content in the storage space of fruits and vegetables, reduce the aerobic respiration of fruits and vegetables, and at the same time ensure the basic respiration and prevent anaerobic respiration of fruits and vegetables, thereby achieving the purpose of long-term preservation of fruits and vegetables. Moreover, the refrigerating and freezing device with the modified atmosphere fresh-keeping function of the invention is further provided with a working condition detecting system configured to detect the working state of the gas regulating membrane module and the air pump, and output prompt information when the working state is abnormal, which can be timely and reliable. The report reported abnormal work and improved the reliability of the air conditioning system.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention are described in detail below by way of example, and not limitation. The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the figure:

1 is a schematic block diagram of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

2 is a schematic diagram of a modified atmosphere preservation principle of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

3 is a schematic structural view of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

Figure 4 is a schematic view of another perspective of the structure shown in Figure 3;

Figure 5 is a schematic partial structural view of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

Figure 6 is a schematic exploded view of the structure shown in Figure 5;

7 is an exploded view of a gas regulating membrane module in a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

8 is a schematic block diagram of a medium condition detecting system of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

Figure 9 is a schematic view showing the arrangement position of the detecting device of the working condition detecting system 70 in the refrigerating and freezing apparatus having the modified atmosphere keeping function according to an embodiment of the present invention.

10 is a flow chart showing a method of detecting a working condition of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention;

11 is a flow chart showing another method of detecting a working condition of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention.

detailed description

The refrigerating and freezing device with the atmosphere-preserving function of the embodiment of the invention adopts the atmosphere-preserving and fresh-keeping technology to form a gas atmosphere in the air-conditioning fresh-keeping sub-space to satisfy the storage and release requirements of the articles.

1 is a schematic block diagram of a refrigerating and freezing apparatus having a modified atmosphere preservation function according to an embodiment of the present invention. The refrigerating and freezing device having a modified atmosphere retaining function generally includes a casing 20, a modified atmosphere freshening system 80, and a working condition detecting system 70. The inside of the box body 20 defines a storage space, and a sealed atmosphere-preserving sub-space is formed in the storage space. The modified atmosphere preservation system 80 includes a gas regulating membrane module 30 and an air pump 40. The air pump 40 infiltrates the gas in the modified air conditioning sub-space through the air-conditioning membrane module 30 to form a gas atmosphere for food preservation in the atmosphere-preserving sub-space of the storage space. The working condition detecting system 70 can detect the working state of the gas regulating membrane module and the air pump, and output a prompt message when an abnormality occurs in the working state. These working conditions include: the speed of the pump, the operating temperature, the intake air flow rate, the exhaust gas flow rate, and the oxygen concentration in the air-conditioned fresh-keeping subspace.

The modified atmosphere freshening system 80 uses a gas regulating membrane to form a gas atmosphere in the modified atmosphere sub-space to meet the storage requirements of the articles. The gas-adjusting membrane (also known as the oxygen-rich membrane) works by using different permeability rates when the components in the air pass through the gas-regulating membrane. Under the pressure difference, the oxygen in the air is preferentially passed through the gas-regulating membrane. In the technology, the gas regulating membrane is generally used for preparing oxygen, and is applied in the fields of medical treatment, fermentation, combustion, and the like. In the embodiment of the present invention, the refrigerating and freezing device uses the gas regulating membrane to discharge oxygen, so that the oxygen concentration in the modified air conditioning sub-space is lowered, and a gas atmosphere conducive to food preservation is realized.

In this embodiment, the modified atmosphere preservation technology extends the food storage life by adjusting the gas atmosphere (gas composition ratio or gas pressure) of the enclosed space in which the storage object is located, and the basic principle is: in a certain closed space ( In the modified atmosphere space, a gas atmosphere different from the normal air component is obtained through the gas regulating membrane to suppress physiological and biochemical processes and microbial activities leading to spoilage of the stored matter (usually food). In particular, in this embodiment, the modified atmosphere preservation will be specifically directed to a modified atmosphere preservation technique that adjusts the proportion of gas components.

It is known to those skilled in the art that normal air components include (by volume percent, hereinafter the same): about 78% nitrogen, about 21% oxygen, about 0.939% rare gases (氦, 氖, argon, krypton, xenon,氡), 0.031% of carbon dioxide, and 0.03% of other gases and impurities (for example, ozone, nitrogen monoxide, nitrogen dioxide, water vapor, etc.. In the field of modified atmosphere preservation, it is usually used to fill the enclosed space with nitrogen-enriched gas. The oxygen content is reduced to obtain a nitrogen-rich and oxygen-poor fresh gas atmosphere. Those skilled in the art should know that the nitrogen-enriched gas refers to a gas having a nitrogen content exceeding the nitrogen content in the above-mentioned normal air, for example, the nitrogen content may be 95%. ～99%, or even higher; and the nitrogen-rich and oxygen-poor fresh gas atmosphere refers to a gas atmosphere in which the nitrogen content exceeds the above-mentioned normal air nitrogen content and the oxygen content is lower than the above-mentioned normal air oxygen content.

Although there are also atmosphere-preserving technologies in the prior art, the history can be traced back to the beginning of 1821 when German biologists discovered that fruits and vegetables can reduce metabolism at low oxygen levels. But until now, due to the large size and high cost of nitrogen-making equipment traditionally used for gas-conditioning preservation, the technology is basically limited to use in various large-scale professional storage (the storage capacity is generally at least 30 tons). . Therefore, vacuum preservation technology is generally used in small-sized refrigerating and freezing equipment such as refrigerators in the prior art.

In the present embodiment, the air-conditioning system is economically compacted and quieted by the above-described air-conditioning membrane module, and is suitable for use in a small-sized refrigerating and freezing apparatus such as a refrigerator. 2 is a schematic view showing the principle of modified atmosphere preservation of a refrigerating and freezing apparatus according to an embodiment of the present invention, and FIG. 3 is a refrigerating and cooling method according to an embodiment of the present invention. Schematic structural view of the freezing device, and FIG. 4 is a schematic structural view of another viewing angle of the structure shown in FIG. As shown in the figure, an embodiment of the present invention provides a refrigerating and freezing device, which may include a casing 20, a door body (not shown), and an air conditioning system 80 (including a gas regulating membrane module 30 and an air pump 40). And the refrigeration system (not shown). A storage space is defined in the casing 20 of the refrigerating and freezing apparatus, and the storage space can be configured as a refrigerating compartment 27, a freezing compartment 25, a changing greenhouse 26, and the like according to the cooling temperature. The refrigerating and freezing device may be a refrigerator having at least a refrigerating chamber 27 and a freezing chamber 25. The refrigeration system can be a conventional compression refrigeration system that provides refrigeration to the storage compartment by, for example, direct cooling and/or air cooling to provide the storage compartment with a desired storage temperature. In some embodiments, the storage temperature of the refrigerator compartment 27 may be 2 to 9 ° C, or may be 4 to 7 ° C; the storage temperature of the freezer compartment 25 may be -22 to -14 ° C, or may be -20 to 16 °C. The freezing compartment 25 is disposed below the refrigerating compartment 27, and the changing greenhouse 26 is disposed between the freezing compartment 25 and the refrigerating compartment 27. The temperature within the freezer compartment 25 typically ranges from -14 °C to -22 °C. The variable greenhouse 26 can be adjusted as needed to store the appropriate food.

In the present embodiment, a sealed atmosphere-preserving sub-space 271 is formed in the storage space, and the modified-air-preserving sub-space 271 may be disposed in any of the above-described compartments, and preferentially disposed in the refrigerating compartment 27 and the changing greenhouse 26. For example, the modified atmosphere sub-space 271 may be a lower storage space provided in the refrigerating compartment 27.

The door body is pivotally mounted to the case 20 and is configured to open or close a storage space defined by the case 20. In order to ensure the sealing property of the modified atmosphere sub-space 271, a small door may be disposed on the inner side of the door body to open or close the modified air-preserving sub-space 271, thereby forming a double-layered door structure. In some alternative embodiments, the refrigerating and freezing apparatus may form the above-described modified atmosphere sub-space 271 using a gas-tight sealed drawer. The modified atmosphere seal drawer may have a drawer body 22 and a drawer body 23. The atmosphere-preserving sub-space 271 is formed by the drawer type storage compartment.

The drawer cylinder 22 has a front opening and is disposed in the storage space (for example, a lower portion of the refrigerating chamber 27). The drawer body 23 is slidably mounted to the drawer cylinder 22, and the front end of the drawer body 23 is provided with an end plate, and a drawer The barrel 22 is fitted to close the opening of the modified atmosphere sub-space 271. One specific way is that the drawer body 23 can be operatively drawn outwardly and inwardly from the forward opening of the drawer body 22. The end plate closes the opening of the modified atmosphere sub-space 271 by the sealing structure.

In some embodiments of the present invention, the drawer body 22 may form a seal with the end plate of the drawer body 23, which may be properly leaked to achieve air pressure balance. In some other embodiments, the air pressure balance can be ensured by providing millimeter-scale micropores or one-way valves on the drawer body 22.

The refrigeration system may be a refrigeration cycle system composed of a compressor, a condenser, a throttle device, and an evaporator. The compressor is mounted in the compressor compartment 24. The evaporator is configured to provide cooling directly or indirectly into the storage space. For example, when the refrigerating and freezing device is a domestic compression type direct cooling refrigerator, the evaporator may be disposed outside or inside the rear wall surface of the inner casing 21. When the refrigerating and freezing device is a domestic compressed air-cooled refrigerator, the casing 20 further has an evaporator chamber, the evaporator chamber is connected to the storage space through the air passage system, and an evaporator is arranged in the evaporator chamber, and a fan is arranged at the outlet. To cycle cooling to the storage space. Since such refrigeration systems are well known and readily implemented by those skilled in the art, in order not to obscure and obscure the inventive aspects of the present application, the refrigeration system itself will not be described in further detail below.

The gas regulating membrane module 30 has a gas regulating membrane and defines an oxygen-rich gas collecting chamber for collecting oxygen-rich gas When the pressure of the chamber is less than the pressure of the surrounding environment, the ambient gas (most of the oxygen) passes through the gas regulating membrane into the gas-enriched oxygen-enriched gas collecting chamber. Specifically, the other side of the air-conditioning membrane may be in direct contact with the modified atmosphere sub-space 271 or with a circulation flow path (or a circulation space) connected to the modified atmosphere sub-space 271, so that the oxygen-rich gas collection chamber can be When the pressure is less than the pressure of the subspace, the atmosphere gas in the air in the modified air conditioning subspace 271 is passed through the gas regulating membrane into the oxygen-rich gas collecting chamber, and in the case of using the oxygen-rich membrane, the modified air conditioning subspace 271 The oxygen is extracted so that the modified atmosphere sub-space 271 forms an oxygen-poor gas atmosphere.

The air pump 40 can be disposed in the compressor chamber 24, and the inlet end of the air pump 40 communicates with the oxygen-rich gas collecting chamber of the gas regulating membrane assembly 30 via the line 50, and is configured to extract the gas of the oxygen-rich gas collecting chamber outward. At least a portion of the oxygen in the modified atmosphere sub-space 271 is passed through the gas-regulating membrane into the oxygen-rich gas collection chamber, thereby reducing the concentration of oxygen in the modified atmosphere. The air pump 40 is configured to extract oxygen-rich gas from the oxygen-rich gas collection chamber to reduce the oxygen concentration of the modified atmosphere sub-space 271. In order to obtain a gas atmosphere rich in nitrogen and oxygen in the modified atmosphere sub-space 271 to facilitate food preservation.

The refrigerating and freezing device of the present invention can form a gas atmosphere rich in nitrogen and oxygen in the modified atmosphere sub-space 271 to facilitate food preservation, and the gas atmosphere reduces the oxygen content of the fruit and vegetable by reducing the oxygen content in the storage space of the fruit and vegetable, and simultaneously It ensures the basic respiration and prevents anaerobic respiration of fruits and vegetables, thus achieving the purpose of long-term preservation of fruits and vegetables. Moreover, the gas atmosphere also has a large amount of gas such as nitrogen gas, which does not reduce the cooling efficiency of articles in the subspace, and can effectively store fruits and vegetables and the like. The air pump 40 is disposed in the compressor compartment 24, and can fully utilize the space of the compressor compartment 24 without occupying other places, so that the extra volume of the refrigerating and freezing apparatus is not increased, and the structure of the refrigerating and freezing apparatus can be made compact.

In some embodiments of the present invention, the air pump 40 and the compressor may be disposed on both sides of the compressor compartment 24, respectively, spaced apart from each other such that the distance of the air pump 40 from the compressor is relatively long, reducing noise superposition and waste heat stacking. For example, the air pump 40 may be disposed at one end of the compressor nacelle 24 adjacent to the pivoting side of the door body. When the refrigerating and freezing device is a door-to-door refrigerator, the air pump 40 can be disposed at any position of the compressor bay 24. In other embodiments of the invention, the air pump 40 may also be disposed adjacent to the compressor, such as the air pump 40 disposed at one end of the compressor bay 24 and between the compressor and the sidewall of the compressor bay 24.

In some embodiments of the invention, the air pump 40 may be mounted in a sealed box that may be mounted within the compressor compartment 24 by a mounting floor. The sealed box can largely block the noise and/or waste heat of the air pump 40 from propagating outward.

5 is a schematic partial structural view of a refrigerating and freezing apparatus according to an embodiment of the present invention, and FIG. 6 is a schematic exploded view of the structure shown in FIG. 5, and the air conditioning membrane module 30 may be disposed in a cylinder of the drawer cylinder 22. It is preferably disposed on the top wall of the drawer body 22. Specifically, a receiving chamber 31 that communicates with the modified atmosphere sub-space 271 is disposed in the top wall of the drawer cylinder 22. At least one first vent hole 222 and at least one second vent hole spaced apart from the at least one first vent hole 222 are defined in a wall surface between the accommodating cavity 31 of the top wall of the drawer cylinder 22 and the modified air conditioning subspace 271. 223, the receiving chamber 31 and the modified atmosphere sub-space 271 are respectively connected at different positions, and the accommodating chamber 31 and the modified atmosphere sub-space 271 are communicated via the at least one first communication hole 222 and the at least one second communication hole 223; The component 30 is disposed in the accommodating cavity 31 and may be disposed on the at least one second communication hole 223 square. The accommodating chamber 31 constitutes a circulation space communicating with the atmosphere-preserving sub-space 271 such that the air-conditioning membrane 36 in the air-conditioning membrane module 30 is in contact with the gas in the conditioned sub-space 271. The first communication hole 222 and the second communication hole 223 are both small holes, and the number may be plural. In some alternative embodiments, the inside of the top wall of the drawer body 22 has a recessed groove. The air conditioning membrane module 30 is disposed in a recessed groove of the top wall of the drawer body 22.

In some embodiments of the present invention, in order to facilitate the flow of the gas in the conditioned storage sub-space 271 and the accommodating chamber 31, a fan 60 may be disposed in the accommodating chamber 31 of the first sealing assembly 71, and the fan 60 is formed to sequentially form at least a first venting hole 222, a receiving cavity 31 and at least one second venting hole 223 return to the airflow of the modified air conditioning subspace 271, thereby causing the gas of the modified atmosphere subspace 271 to enter the receiving cavity via the first communication hole 222. 31, and the gas in the accommodating chamber 31 is introduced into the modified atmosphere sub-space 271 via the second communication hole 223, thereby forming an air flow via the air-conditioning membrane module 30.

The fan 60 is disposed at the position of the accommodating cavity 31 above the at least one first communication hole 222, which causes the gas of the modified atmosphere sub-space 271 to enter the accommodating cavity 31 via the at least one first communication hole 222, and the inside of the accommodating cavity 31 The gas enters the modified-air-preserving sub-space 271 via the at least one second communication hole 223 to receive oxygen from the gas passing through the gas regulating membrane module 30.

The fan 60 is preferably a centrifugal fan and can be disposed at the first communication hole 222 in the gas collection chamber 31. That is, the centrifugal fan 60 is located above the at least one first communication hole 222, and the air inlet is directed to the first communication hole 222. The air outlet of the centrifugal fan 60 can face the air conditioning membrane module 30. At least one second communication hole 223 may be located below the air conditioning membrane module 30.

The top wall of the drawer body 22 includes a lower plate portion 224 and a cover portion 225, which together define a receiving cavity 31. For example, an upper surface of the lower plate portion 224 may form a recessed groove, and the cover portion 225 is covered in the recessed groove to form The chamber 31 is accommodated. At least one first communication hole 222 is disposed at a front portion of the top wall, and at least one second communication hole 223 is disposed at a rear portion of the top wall. The centrifugal fan 60 is disposed at the front of the accommodating chamber 31, and the air conditioned membrane module 30 is disposed at the rear of the accommodating chamber 31.

The gas regulating membrane module 30 has a gas regulating membrane 36 and an oxygen-rich gas collecting chamber, and one side of the gas regulating membrane 36 faces the oxygen-rich gas collecting chamber so that the pressure in the oxygen-rich gas collecting chamber is smaller than the other side of the gas regulating membrane 36 At the time of the pressure, oxygen in the air on the other side of the gas-conditioning membrane 36 is passed through the gas regulating membrane 36 into the oxygen-rich gas collecting chamber. Specifically, the air-conditioning membrane module 30 can be in contact with the circulation flow path (ie, the accommodating chamber 31) that communicates with the modified atmosphere sub-space 271, so that the pressure in the oxygen-rich gas collection chamber can be less than the pressure of the modified-air-preserving sub-space 271. At the same time, the oxygen in the gas in the accommodating chamber 31 (from the modified atmosphere sub-space 271) is more transmitted through the gas-regulating membrane into the oxygen-rich gas collecting chamber than the nitrogen in the space airflow around the gas regulating membrane module 30. That is, the fan 60 forms oxygen in the gas stream to pass through the gas regulating membrane more than the nitrogen gas into the oxygen-rich gas collecting chamber. The plurality of first sealing members 71 may adopt the same structure, and the specific sizes may be set to be the same or different as needed.

7 is an exploded view of a gas regulating membrane assembly 30 in a refrigerating and freezing apparatus according to an embodiment of the present invention. The air conditioning membrane module 30 may be in the form of a flat plate, and the air conditioning membrane module 30 may further include a support frame 32. The support frame 32 has first and second surfaces parallel to each other, formed with a plurality of airflow passages extending on the first surface, extending on the second surface, and extending through the support frame to communicate the first surface and the second surface A plurality of gas flow channels collectively form an oxygen-rich gas collection chamber.

The air-conditioning membrane 36 can be two layers, which are respectively laid on both sides of the support frame 32 to close the oxygen-rich gas collecting chamber, and each layer of the air-conditioning membrane 36 can be formed by laminating one or more gas-regulating membranes. The gas permeating through the gas regulating membrane 36 is a complicated process, and the permeation mechanism is generally that the gas molecules are first adsorbed to the surface of the gas regulating membrane 36, and then the difference in dissolution and diffusion coefficients in the gas regulating membrane in the gas regulating membrane 36 is observed. To achieve gas separation. When the gas is subjected to the pressure difference between the two sides of the gas regulating membrane 36, the oxygen having a high permeation rate is concentrated on the permeate side of the gas regulating membrane 36 to be concentrated in the oxygen-rich gas collecting chamber.

The support frame 32 may include a frame, a rib plate and/or a flat plate disposed in the frame, and an air flow passage between the ribs, between the ribs and the flat plate, and the surface of the rib and the surface of the flat plate may be A groove is formed to form an air flow passage. The ribs and/or the flat plate may increase the structural strength and the like of the air-conditioning membrane module 30. That is, the support frame 32 has first and second surfaces parallel to each other, and a plurality of air flow passages communicating with the first surface and the second surface are formed inside. Two gas regulating films 36 are respectively laid on the first surface and the second surface of the support frame 32 to form an oxygen-rich gas collecting chamber together with a plurality of gas flow passages of the support frame 32.

In some embodiments of the invention, the support frame 32 includes a venting aperture 33 in communication with the plurality of airflow passages described above, disposed on the rim 32 to allow oxygen in the oxygen-rich gas collection chamber to be output. The air suction hole 33 is in communication with the air suction device 41. The air-conditioning film 36 is first attached to the frame by the double-sided tape 34 and then sealed by the sealant 35.

In some embodiments, the plurality of airflow passages formed inside the support frame 32 may be one or more cavities in communication with the suction holes 33. In some embodiments, the aforementioned plurality of airflow channels formed inside the support frame 32 may have a mesh structure.

Specifically, the support frame 32 may include a frame, a rib plate and/or a flat plate disposed in the frame, and an air flow passage between the ribs, between the ribs and the flat plate, the surface of the rib plate, and the surface of the flat plate. Grooves may be formed in the upper portion to form an air flow passage. The ribs and/or the flat plate may increase the structural strength and the like of the air-conditioning membrane module 30.

For example, the support frame 32 has first and second surfaces parallel to each other, and the support frame 32 is formed to extend on the first surface, extend on the second surface, and penetrate the support frame 32 to communicate the first surface and the second surface. Multiple airflow channels. That is, the plurality of airflow passages include a plurality of first airflow passages extending on the first surface, a plurality of second airflow passages extending on the second surface, and a through support frame 32 to communicate the first surface and the first a plurality of third airflow channels of the two surfaces. Or it may be understood that the support frame 32 is formed with a plurality of first air flow passages extending on the first surface and a plurality of second air flow passages extending on the second surface, and the first air flow passage and the second air flow passage They are connected by a third air flow passage. All of the gas flow channels together form an oxygen-rich gas collection chamber.

The one or more air-conditioning membranes form two planar air-conditioning membrane layers which are respectively laid on the first surface and the second surface of the support frame to form a flat-shaped air-conditioning membrane module 30.

The support frame 32 is formed with a suction hole 33 communicating with the above-described air flow passage, and the air suction hole 33 communicates with the oxygen-rich gas collecting chamber for connecting the inlet end of the air pump 40, thereby allowing the oxygen-rich gas in the oxygen-rich gas collecting chamber to be output. When the air pump 40 is in operation, the oxygen-enriched gas collecting chamber 38 is in a negative pressure state, and oxygen in the air outside the gas regulating membrane module 30 continues to pass through the gas regulating membrane 36 into the oxygen-rich gas collecting chamber. The support frame 32 as a whole may have a generally rectangular frame.

In some embodiments, the support frame 32 can include a bezel, a plurality of first ribs, and a plurality of second ribs. The plurality of first ribs are longitudinally spaced apart inside the frame and extend in the lateral direction, and one side surface of the plurality of first ribs forms a first surface. a plurality of second ribs are laterally spaced apart and extend in a longitudinal direction on the other side surface of the plurality of first ribs, and a side surface of the plurality of second ribs away from the first rib forms a second surface . That is, the plurality of second ribs are disposed on one side surface of the plurality of first ribs. The surfaces of the plurality of first ribs and the plurality of second ribs respectively form a first surface and a second surface; that is, surfaces of the plurality of first ribs and the plurality of second ribs Forming a first surface; a surface of the plurality of second ribs opposite to the plurality of first ribs forming a second surface. A plurality of airflow passages are formed between adjacent first ribs, between adjacent second ribs, and between adjacent first ribs and second ribs. Wherein the gap between the two adjacent first ribs forms a first air flow passage extending on the first surface, and the gap between the two adjacent second ribs forms a second extension on the second surface The two air flow passages, the gap between the adjacent first ribs and the second ribs form a third air flow passage that penetrates the first surface and the second surface through the support frame 32. That is, the intersecting structure formed by all of the first ribs and all of the second ribs forms the aforementioned plurality of air flow passages.

The support frame 32 is provided with a plurality of first ribs extending longitudinally and extending in the lateral direction inside the frame and a plurality of second ribs extending laterally and longitudinally on one side surface of the plurality of first ribs The plate thus ensures the continuity of the air flow passage on the one hand, and greatly reduces the volume of the support frame on the other hand, and greatly enhances the strength of the support frame 32. In addition, the above structure of the support frame 32 ensures that the air-conditioning membrane 36 can obtain sufficient support, and can maintain a good flatness even in the case of a large negative pressure inside the oxygen-rich gas collecting chamber, thereby ensuring the gas regulating film. The service life of assembly 30.

The air vent 33 may be disposed on the lateral side of the frame in the longitudinal middle portion of the frame. This arrangement is equivalent to pumping air from the center of the air-conditioning membrane module 30, which is advantageous for the air-conditioning membrane 36 to be uniformly ventilated. The air suction hole 33 may be a stepped hole or a stepped hole to ensure airtightness of the joint portion when it is connected to the air pump 40 through the hose.

In addition, the above structure of the support frame 32 ensures that the air-conditioning membrane 36 can obtain sufficient support, and can maintain a good flatness even in the case of a large negative pressure inside the oxygen-rich gas collecting chamber, thereby ensuring the gas regulating film. The service life of assembly 30.

The intake end of the air pump 40 is connected to the air suction hole 33 via the air suction line 50 to communicate with the oxygen-rich gas collecting chamber of the air conditioning membrane module 30 in the plurality of first airtight components 71, and is configured to set the oxygen-rich gas collecting chamber The gas is extracted outward to continuously reduce the oxygen content in the modified atmosphere sub-space 271, thereby forming a gas atmosphere rich in nitrogen and oxygen in the modified atmosphere sub-space 271 to facilitate food preservation. The air pump 40 can be disposed in the compressor compartment 24, and can fully utilize the space of the compressor compartment 24 without occupying other places, so that the extra volume of the refrigerating and freezing apparatus is not increased, and the structure of the refrigerating and freezing apparatus can be made compact.

8 is a schematic block diagram of a medium condition detecting system 70 of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention, and FIG. 9 is a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention. Schematic diagram of the arrangement position of the detecting device of the medium working condition detecting system 70.

The condition detection system 70 includes an air pump detection subsystem 710 and a gas regulating membrane module detection subsystem 720 for detecting the operating states of the air pump 40 and the air conditioning membrane module 30, respectively, wherein the air pump detection subsystem 710 may include: a pump pump diagnosis The device 711, the pumping speed sensor 712, the pumping pump temperature sensor 713, the pumping pump intake air flow sensor 714, and the pumping pump exhaust gas flow sensor 715. The gas regulating membrane module detecting subsystem 720 includes: a gas regulating membrane module detecting device 721, an oxygen concentration sensor 722, and a fan rotational speed sensor 723. The refrigerating and freezing apparatus may further include a storage space opening and closing detecting device 72 and an air-conditioning preserving sub-space opening and closing detecting device 82. In order to avoid the influence of noise, the exhaust end of the air pump 40 may also be provided with a silencer 130.

The modified atmosphere storage opening/closing detecting device 82 and the refrigerating chamber opening and closing detecting device 72 can be used to detect the compartment (for example, the refrigerating chamber 27) where the modified atmosphere subspace 271 is located, and the modified atmosphere subspace 271 is opened and closed. The event uses a Hall device or a magnetic sensitive device to detect the opening and closing action of the door body or the opening and closing action of the end plate of the drawer body 23 and the drawer cylinder 22. When the drawer type storage compartment is used as the atmosphere-preserving sub-space 271, the modified-air-preserving sub-space opening and closing detecting means 82 may be respectively disposed on the end plate of the drawer body 23 and the drawer cylinder 22; the refrigerating compartment opening and closing detecting means 72 can be respectively disposed on the casing 20 and the corresponding door body.

The oxygen concentration sensor 722 is disposed in the modified atmosphere sub-space 271 for measuring the gas atmosphere index in the modified atmosphere sub-space 271. It can use various types of oxygen concentration sensors such as diaphragm type galvanic battery type, electrochemical, catalytic combustion, constant potential electrolytic type, etc. In some alternative embodiments, the oxygen concentration sensor 722 can also be replaced by a gas analyzer. For measuring the gas content in the modified atmosphere sub-space 271, including the oxygen content, may also include nitrogen content, carbon dioxide content, and the like.

The pumping air temperature sensor 713 may be disposed on the surface of the air pump 40, the air pump inlet air flow sensor 714, and the air pump exhaust air flow sensor 715, respectively, and disposed on the intake and exhaust lines of the air pump 40.

The pumping speed sensor 712 is used to measure the rotational speed of the pumping pump 40. The air pump diagnostic device 711 can determine whether the rotational speed of the air pump 712 exceeds the rotational speed threshold of the air pump 40, and if so, determine the air pump fault and output information indicating that the air pump is faulty. The speed threshold can be determined according to the speed of the air pump 40 under normal operating conditions.

The air pump temperature sensor 713 is used to measure the operating temperature of the air pump 40, and the air pump diagnostic device 711 is further configured to determine that the air pump 40 is faulty when the operating temperature of the air pump 40 exceeds the temperature threshold, and output an indication that the air pump 40 is faulty. Information. The temperature threshold may be determined according to the limit value of the normal operation state of the air pump 40. If the value is exceeded, it is determined that the air pump 40 may be burnt.

The pump intake air flow sensor 714 can be configured to measure the intake air flow of the air pump 40. The air pump exhaust flow sensor 715 can measure the exhaust flow rate of the air pump 40. In the normal state, the intake air flow rate of the air pump 40 should be equal to the air flow rate of the air pump 40. If they are not equal, the air pump 40 may be in a leak condition. The air pump diagnostic device 711 can be configured to compare the intake air flow rate and the exhaust air flow rate, and when the exhaust air flow rate exceeds the intake air flow preset threshold value, if yes, determine that the air pump 40 has a gas leakage hazard, and output the prompt air pump 40 to leak air. Information. The threshold value of the above flow rate difference may also be determined according to the normal working body of the air pump 40.

The air-conditioning membrane module detecting device 721 can be configured to determine whether the pumping air flow rate of the air pump 40 exceeds a preset first pumping air flow threshold. If it is exceeded, it is determined that the air-conditioning membrane module 30 is damaged, and the output indicates that the air-conditioning membrane module needs to be damaged. Prompt message. The judgment principle is that if the gas regulating membrane module 30 is broken and the oxygen-rich gas collecting chamber is in communication with the outside, the pumping flow rate will increase.

The air-conditioning membrane module detecting device 722 can also determine whether the pumping air flow rate of the air pump 40 is less than a preset second pumping air flow threshold value, and if so, determine that the air-conditioning membrane module 30 is stained, and output the prompting gas regulating membrane module 30 The message of the damage, the second pumping flow threshold is less than the first pumping flow threshold. Since the gas regulating membrane is fouled, the gas passage speed is reduced, so that the suction flow rate of the air pump 40 is reduced. Both the second pumping flow rate and the first pumping air flow threshold may be set according to the pumping flow rate of the air pump 40 when the gas regulating membrane module 30 normally infiltrates the gas.

The oxygen concentration sensor 722 is disposed in the modified atmosphere subspace 721 and configured to detect the oxygen concentration in the modified atmosphere subspace 721. The gas regulating membrane module detecting device 721 can determine the decreasing speed of the oxygen concentration in the modified atmosphere sub-space 721 based on the oxygen concentration measured by the oxygen concentration sensor 722. The air-conditioning membrane module detecting device 721 can determine the decreasing speed of the oxygen concentration according to the detected value of the oxygen concentration sensor 722 after the modified atmosphere fresh-keeping system 80 is activated, and will respectively be different from the preset first air-conditioning speed and second air-conditioning speed. Comparing, if the decreasing rate of the oxygen concentration is greater than the first air-conditioning speed, determining that the air-conditioning membrane module 30 is working normally; if the decreasing speed of the oxygen concentration is less than the first air-conditioning speed and greater than the second air-conditioning speed, the output prompting air-conditioning If the decrease rate of the oxygen concentration is less than the second air-conditioning speed, the prompt message indicating that the air-conditioning membrane module 30 is damaged is output, and the first air-conditioning speed is greater than the second air-conditioning fresh-keeping sub-space 721. The oxygen concentration change can be set. Therefore, the working condition of the gas regulating film is judged by the effect of the air conditioning.

Figure 10 is a flow chart showing a method of detecting a condition of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention. The refrigerating and freezing apparatus having the modified atmosphere preservation function of this embodiment can determine the working states of the air conditioning membrane module 30 and the air pump 40 by the following steps:

Step S1002, the working state detection is initialized, and it is checked whether each sensor works normally;

In step S1004, it is checked whether the rotation speed of the fan 60 is within the normal range. If no, step S1010 is performed, and abnormal processing of the fan 60 is performed;

In step S1006, it is checked whether the rotation speed of the air pump 40 is within the normal range. If no, step S1012 is performed, and the abnormal processing of the air pump 40 is performed;

In step S1008, it is checked whether the temperature of the air pump 40 is within the normal range. If no, step S1012 is performed, and the abnormal processing of the air pump 40 is performed.

11 is a flow chart showing another method of detecting a working condition of a refrigerating and freezing apparatus having a modified atmosphere fresh-keeping function according to an embodiment of the present invention. The flow chart shows the condition determination process for the air pump 40 and the air conditioning membrane module 30 after the air pump 40 is started, and the air pump 40 is activated to perform the following steps:

In step S1102, it is determined whether the refrigerating and freezing device is equipped with the oxygen concentration sensor 722. If the oxygen concentration sensor 722 is disposed, the degree of decrease in the oxygen concentration is determined after a predetermined time t, and if the oxygen concentration drops to the first concentration threshold, the gas is determined. The membrane adjusting device 30 is normal; if the oxygen concentration drops between the first concentration threshold and the second concentration threshold, it is determined that the efficiency of the gas regulating membrane module 30 is decreased, and it is recommended to replace; the oxygen concentration is still above the second concentration threshold, and the gas regulating membrane module is determined. 30 is not available;

In step S1104, it is determined whether the intake air flow rate of the air pump 40 is equal to the exhaust air flow rate. If not, it is determined whether the difference between the intake air flow rate and the exhaust air flow rate is greater than a set threshold value, and if the difference between the intake air flow rate and the exhaust air flow rate determines the air pump Unusable; the difference between the intake air flow rate and the exhaust air flow rate is less than the set threshold value, and the efficiency of the air pump 40 is determined to be lowered, and it is recommended to replace it.

In step S1106, whether the intake air flow rate of the air pump 40 is within a normal range, if the air flow rate is higher than the normal range, it is determined that the air conditioning film is damaged and leaks; the air flow rate is determined to be a gas mask pollution in the normal range, and the air permeability is poor.

Through the above process, it is not only possible to determine whether the modified atmosphere freshening system 80 is working properly, but also to analyze the cause of the failure, and greatly improve the operational reliability of the modified atmosphere freshening system 80.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

A refrigerating and freezing device with a modified atmosphere fresh-keeping function, comprising:

a tank body having a storage space defined therein, and a sealed atmosphere-preserving sub-space is formed in the storage space;

a modified atmosphere preservation system comprising a gas regulating membrane module and an air pump configured to infiltrate a gas of the modified atmosphere sub-space through the gas regulating membrane module to adjust a gas atmosphere in the storage space Forming a gas atmosphere that is conducive to food preservation in the fresh-keeping sub-space;

The working condition detecting system is configured to detect an operating state of the gas regulating membrane module and the air pump, and output prompt information when an abnormality occurs in the working state.
The refrigerating and freezing apparatus according to claim 1, wherein said condition detection system comprises an air pump detection subsystem, and said air pump detection subsystem comprises:

An air pump speed sensor configured to measure a speed of the air pump;

The air pump diagnostic device is configured to determine whether the rotational speed of the air pump exceeds a speed threshold of the air pump, and if so, determine the air pump fault and output information indicating that the air pump is faulty.
The refrigerating and freezing apparatus according to claim 2, wherein the pump detection subsystem further comprises:

An air pump temperature sensor configured to measure an operating temperature of the air pump, and

The air pump diagnostic device is further configured to determine the air pump failure when the operating temperature of the air pump exceeds a temperature threshold, and output information indicating that the air pump is faulty.
The refrigerating and freezing apparatus according to claim 2, wherein the pump detection subsystem further comprises:

An air pump intake air flow sensor configured to measure an intake air flow of the air pump;

An air pump exhaust flow sensor configured to measure an exhaust flow of the air pump, and

The air pump diagnostic device is further configured to compare the intake air flow rate and the exhaust air flow rate, and when the exhaust air flow rate exceeds the intake air flow rate preset threshold value, if yes, determine that the air pump leaks A gas hazard, and output information indicating that the pump is leaking.
The refrigerating and freezing apparatus according to claim 4, wherein the condition detecting system further comprises a gas regulating membrane module detecting subsystem, and the gas regulating membrane module detecting subsystem comprises:

The air conditioning membrane module detecting device is configured to determine whether the pumping air flow rate of the air pump exceeds a preset first pumping air flow threshold, and if so, determining that the air conditioning membrane module is damaged, and outputting the gas regulating membrane module Need to break the message.
The refrigerating and freezing apparatus according to claim 5, wherein the gas regulating membrane module detecting device is further configured to:

Determining whether the pumping flow rate of the air pump is less than a preset second pumping air flow threshold, and if so, determining that the air conditioning membrane module is fouled, and outputting a prompt message indicating that the air conditioning membrane module is fouled, The second pumping flow threshold is less than the first pumping flow threshold.
The refrigerating and freezing apparatus according to claim 6, further comprising:

An oxygen concentration sensor disposed in the modified atmosphere sub-space and configured to detect an oxygen concentration in the modified atmosphere sub-space;

The gas regulating membrane module detecting device is further configured to: after the gas-conditioning fresh-keeping system is started, determine a decreasing speed of the oxygen concentration according to the detected value of the oxygen concentration sensor, and adjust the first air-conditioning with the preset Comparing the speed and the second air-conditioning speed respectively, if the descending speed of the oxygen concentration is greater than the first air-conditioning speed, determining that the air-conditioning membrane module works normally; if the oxygen concentration decreases faster than the first If the speed of the air conditioning is greater than the speed of the second air conditioning, the prompt message indicating that the air conditioning membrane module needs to be replaced is output; if the decreasing speed of the oxygen concentration is less than the second air conditioning speed, the prompting station is output The prompt information that the gas regulating membrane module is damaged, wherein the first air-conditioning speed is greater than the second air-conditioning speed.
The refrigerating and freezing apparatus according to claim 1, further comprising:

a modified atmosphere sealing drawer disposed in the storage space and defining the modified atmosphere sub-space, and the modified atmosphere sealing drawer comprises:

a drawer cylinder having a forward opening and disposed in the storage space;

a drawer body slidably mounted in the drawer body for operatively withdrawing and inserting outwardly from a forward opening of the drawer body, and an end plate of the drawer body and the drawer body The forward opening forms a sealed structure, and the inside of the drawer body forms the modified atmosphere.
The refrigerating and freezing apparatus according to claim 8, wherein

a receiving cavity communicating with the fresh-keeping subspace is disposed in a top wall of the drawer body for arranging the air-conditioning membrane module; the receiving cavity of the top wall of the drawer cylinder and the atmosphere-preserving fresh-keeping At least one first vent hole and at least one second vent hole spaced apart from the at least one first vent hole are defined in the wall between the subspaces to respectively communicate the accommodating cavity and the atmosphere at different positions Fresh space;

The refrigerating and freezing apparatus further includes a fan disposed in the accommodating cavity to urge formation to be sequentially returned via the at least one first vent hole, the accommodating cavity, and the at least one second vent hole The airflow of the air-conditioned fresh-keeping subspace.
The refrigerating and freezing apparatus according to claim 1, further comprising:

a storage space opening and closing detecting device configured to detect a state in which the storage space is opened and closed;

The air-conditioned fresh-keeping sub-space opening and closing detecting device is configured to detect a state in which the modified-air-preserving sub-space is opened and closed.