Fresh-keeping cold storage and door opening control method thereof

Abstract

The present application provides a fresh-keeping cold storage and a door opening control method thereof. The fresh-keeping cold storage comprises: a cold storage body, comprising an internal space and at least one cold storage door, the cold storage door being used to connect the internal space with the outside of the cold storage body or to connect different subspaces of the internal space; a fresh air system being used to deliver fresh air to the internal space; and a pressure regulating device being operably coupled to the fresh air system and configured to manipulate the fresh air system to reduce the pressure difference on both sides of the cold storage door to facilitate opening of the cold storage door. The fresh-keeping cold storage and the door opening control method thereof facilitate opening of the cold storage door.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a fresh-keeping cold storage and a door opening control method thereof. Background Art

[0002] In the related art, fresh-keeping cold storage, such as mobile or fixed fruit and vegetable fresh-keeping cold storage, has a low temperature and the pressure inside the storage is usually less than atmospheric pressure. When people outside the storage want to enter the cold storage, it is not easy to open the cold storage door.

[0003] The above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this application is to provide a fresh-keeping cold storage and a door opening control method thereof, aiming to solve the problem in the related art that the cold storage door is difficult to open.

[0005] The first aspect of the present application provides a fresh-keeping cold storage, comprising:

[0006] A cold storage body, comprising an internal space and at least one cold storage door, wherein the cold storage door is used to connect the internal space with the outside of the cold storage body or to connect different subspaces of the internal space;

[0007] A fresh air system for delivering fresh air to the interior space; and

[0008] The pressure regulating device is operably coupled to the fresh air system and is configured to manipulate the fresh air system to reduce the pressure difference on both sides of the cold storage door so as to facilitate opening the cold storage door.

[0009] In some embodiments of the fresh-keeping cold storage,

[0010] The cold storage body includes an outer wall and a first partition wall, the outer wall encloses an inner space of the cold storage body, the inner space includes a plurality of subspaces, the plurality of subspaces include a cold storage room and a transition room, the first partition wall is located between the cold storage room and the transition room to separate the cold storage room and the transition room, the at least one cold storage door includes a cold storage outer door provided on the outer wall for connecting the outside of the cold storage body with the transition room, and a cold storage inner door provided on the first partition wall for connecting the transition room with the first partition wall;

[0011] The fresh air system includes a fresh air fan, a fresh air duct, and a fresh air control valve group. The fresh air fan is configured to deliver fresh air into the fresh air duct. The fresh air duct includes a cold storage room vent and a transition room vent respectively connected to the cold storage room and the transition room. The fresh air control valve group is configured to adjust the ventilation volume of the cold storage room vent and the transition room vent.

[0012] The pressure regulating device includes a controller connected to the fresh air fan and the fresh air control valve group by signal, and the controller is configured to:

[0013] Manipulate the fresh air blower and at least part of the fresh air control valve group to adjust the pressure in the transition room, so as to reduce the pressure difference between the transition room and the outside of the cold storage body to facilitate opening the cold storage outer door; and / or

[0014] The fresh air blower and at least a part of the fresh air control valve group are operated to adjust the pressure of at least one of the cold storage room and the transition room to reduce the pressure difference between the transition room and the cold storage room to facilitate opening the cold storage inner door.

[0015] In some embodiments of the fresh-keeping cold storage, the fresh air control valve group includes:

[0016] a cold storage room ventilation valve configured to control the ventilation volume of the cold storage room vent;

[0017] a transition vent valve configured to control a ventilation amount of the transition vent; and

[0018] The air duct control valve is arranged in the fresh air duct and located between the refrigeration room vent and the transition room vent, and is configured to adjust the ventilation volume from the fresh air duct to the transition room vent.

[0019] In some embodiments of the fresh-keeping cold storage,

[0020] The pressure regulating device includes a parameter detection device, which is configured to detect at least one of the gas parameters inside the cold storage room, inside the transition room, at the transition room vent in the fresh air duct, and outside the cold storage body;

[0021] The controller is signal-connected to the parameter detection device and is configured to control the operation of at least part of the fresh air fan and the fresh air control valve group according to the gas parameters detected by the parameter detection device.

[0022] In some embodiments of the fresh-keeping cold storage, the gas parameter includes at least one of gas temperature and gas pressure.

[0023] In some embodiments of the fresh-keeping cold storage, the parameter detection device includes:

[0024] a cold storage room pressure detection device, configured to detect the gas pressure in the cold storage room; and / or

[0025] a cold storage room temperature detection device, configured to detect the gas temperature in the cold storage room; and / or

[0026] a transition room pressure detection device, configured to detect the gas pressure in the transition room; and / or

[0027] a transition room temperature detection device, configured to detect the gas temperature in the transition room; and / or

[0028] A cold storage external pressure detection device, configured to detect the gas pressure outside the cold storage body; and / or

[0029] A fresh air duct pressure detection device is configured to detect the gas pressure at the transitional vent in the fresh air duct; and / or

[0030] The fresh air duct temperature detection device is configured to detect the gas temperature at the transition room vent in the fresh air duct.

[0031] In some embodiments of the fresh-keeping cold storage, the cold storage body further includes a second partition wall, the multiple subspaces of the cold storage body further include an equipment room, the second partition wall is located between the equipment room and the cold storage room to separate the equipment room from the cold storage room, and the fresh air fan is located in the equipment room.

[0032] In some embodiments of the fresh-keeping cold storage, the fresh-keeping cold storage further includes a refrigeration system, and the refrigeration system is configured to adjust the air temperature and / or humidity in the refrigerated room.

[0033] The second aspect of the present application provides a door opening control method for a fresh-keeping cold storage according to the first aspect of the present application, the door opening control method comprising: before opening the cold storage door, operating the fresh air system to reduce the pressure difference on both sides of the cold storage door.

[0034] In some embodiments of the door opening control method of the fresh cold storage,

[0035] The cold storage body includes an outer wall and a first partition wall, the outer wall encloses an inner space of the cold storage body, the inner space includes a plurality of subspaces, the plurality of subspaces include a cold storage room and a transition room, the first partition wall is located between the cold storage room and the transition room to separate the cold storage room and the transition room, the at least one cold storage door includes a cold storage outer door provided on the outer wall for connecting the outside of the cold storage body with the transition room, and a cold storage inner door provided on the first partition wall for connecting the transition room with the first partition wall;

[0036] The fresh air system includes a fresh air fan, a fresh air duct, and a fresh air control valve group. The fresh air fan is configured to deliver fresh air into the fresh air duct. The fresh air duct includes a cold storage room vent and a transition room vent respectively connected to the cold storage room and the transition room. The fresh air control valve group is configured to adjust the ventilation volume of the cold storage room vent and the transition room vent.

[0037] The pressure regulating device includes a controller connected to the fresh air fan and the fresh air control valve group by signal, and the controller is configured to: operate the fresh air fan and at least a part of the equipment in the fresh air control valve group to adjust the pressure of the transition room, so as to reduce the pressure difference between the transition room and the outside of the cold storage body to facilitate opening the cold storage outer door; and / or operate the fresh air fan and at least a part of the equipment in the fresh air control valve group to adjust the pressure of at least one of the cold storage room and the transition room, so as to reduce the pressure difference between the transition room and the cold storage room to facilitate opening the cold storage inner door;

[0038] Wherein, the door opening control method includes:

[0039] Before opening the outer door of the cold storage, executing step A1, said step A1 comprising: operating the fresh air blower and at least part of the fresh air control valve group to adjust the pressure of the transition room to reduce the pressure difference between the transition room and the outside of the cold storage body; and / or

[0040] Before opening the inner door of the cold storage, execute step A2, which includes: operating the fresh air fan and at least part of the equipment in the fresh air control valve group to adjust the pressure of at least one of the cold storage room and the transition room to reduce the pressure difference between the transition room and the cold storage room.

[0041] In some embodiments of the door opening control method for a fresh-keeping cold storage, the door opening control method includes:

[0042] Before opening the outer door of the cold storage, if the air pressure P2 in the transition room is less than the air pressure P outside the cold storage, perform step A1; and / or

[0043] Before opening the cold storage inner door, when the air pressure P1 in the cold storage room is lower than the air pressure P2 in the transition room, step A2 is performed.

[0044] In some embodiments of the door opening control method of the fresh cold storage,

[0045] The fresh air control valve group includes a cold storage room ventilation valve, a transition room ventilation valve and an air duct control valve. The cold storage room ventilation valve is configured to control the ventilation volume of the cold storage room vent, the transition room ventilation valve is configured to control the ventilation volume of the transition room vent, and the air duct control valve is arranged in the fresh air duct and located between the cold storage room vent and the transition room vent, and is configured to adjust the ventilation volume from the fresh air duct to the transition room vent; wherein,

[0046] In the case that the cold storage room does not need fresh air, the step A1 includes: turning on the fresh air blower, closing the cold storage room ventilation valve, opening the air duct control valve and the transition room ventilation valve; and / or

[0047] In the case that the cold storage room does not need fresh air, the step A2 includes: opening the air duct control valve and the transition room ventilation valve, opening the cold storage room ventilation valve, and closing the fresh air blower; and / or

[0048] When the cold storage room needs fresh air, step A1 includes: adjusting the cold storage room ventilation valve so that the total ventilation volume of all the cold storage room vents is lower than the maximum ventilation volume or is zero, opening the air duct control valve, closing the transition room ventilation valve, and after a preset condition is met, closing the air duct control valve and opening the transition room ventilation valve; and / or

[0049] In the case that fresh air is needed in the cold storage room, step A2 includes: opening the air duct control valve and the transition room ventilation valve.

[0050] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room does not need fresh air, in step A1, the air duct control valve is fully opened and / or the transition room ventilation valve is fully opened.

[0051] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room does not need fresh air, after executing step A1 and the cold storage outer door is opened, the air duct control valve and the transition room ventilation valve are closed, and the cold storage room ventilation valve is opened.

[0052] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room does not need fresh air, in step A2, at least one of the air duct control valve, the transition room ventilation valve, and the cold storage room ventilation valve is fully opened.

[0053] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room does not need fresh air, step A2 is performed and after the cold storage inner door is opened, the air duct control valve and the transition room ventilation valve are closed.

[0054] In some embodiments of the door opening control method for a fresh cold storage, when fresh air is needed in the cold storage room, in step A1, before the preset condition is reached, the smaller P2 is, the cold storage room ventilation valve is adjusted to reduce the total ventilation volume.

[0055] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room needs fresh air, in step A1, before the preset condition is met,

[0056] When P2≥90%P, adjusting the cold storage room ventilation valve so that the total ventilation volume is 85-95% of the maximum ventilation volume; and / or

[0057] When 90%P>P2≥80%P, the total ventilation volume is 75-85% of the maximum ventilation volume; and / or

[0058] When 80%P>P2≥70%P, the total ventilation volume is set to 55-65% of the maximum ventilation volume; and / or

[0059] When 50% P>P2, all the cold storage room ventilation valves are closed to make the total ventilation volume zero.

[0060] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room needs fresh air, in step A1, the preset condition is that the fresh air pipe pressure detection device detects that the pressure P0 is greater than P3, wherein,

[0061]

[0062] T2 is the air temperature in the transition room;

[0063] V2 is the volume of the transition space;

[0064] T3 is the gas temperature at the vent of the transition room in the fresh air duct;

[0065] V3 is the volume of the enclosed air duct space in the fresh air duct downstream of the air duct control valve.

[0066] In some embodiments of the door opening control method for a fresh-keeping cold storage, the preset condition is that the fresh air duct pressure detection device detects that the pressure P0 is greater than or equal to 1.1 times P3.

[0067] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room needs fresh air, in step A1, after the preset condition is met, the ventilation valve of the cold storage room is fully opened.

[0068] In some embodiments of the door opening control method for a fresh cold storage, when fresh air is needed in the cold storage room, in step A2, the transition room ventilation valve is fully opened, and the larger P1 is, the smaller the opening of the air duct control valve is.

[0069] In some embodiments of the door opening control method of the fresh cold storage,

[0070] When P1≥90%P2, maintaining the air duct control valve at 5-15% opening; and / or

[0071] When 90% P2> P1≥80% P2, maintaining the air duct control valve at 25-30% opening; and / or

[0072] When 80% P2> P1≥70% P2, maintaining the air duct control valve at 40-60% opening; and / or

[0073] When 50% P2>P1, the air duct control valve is fully opened.

[0074] Based on the fresh-keeping cold storage and the door opening control method thereof provided in the present application, the pressure regulating device can reduce the pressure difference on both sides of the cold storage door by manipulating the fresh air system, thereby facilitating the opening of the cold storage door.

[0075] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0077] Figure 1 This is a schematic diagram of the principle structure of the fresh-keeping cold storage of an embodiment of the present application.

[0078] Figure 2 This is a block diagram of the connection between the pressure regulating device and the fresh air system of the fresh-keeping cold storage in an embodiment of the present application.

[0079] Figure 1 and Figure 2 In the figure, each reference numeral represents:

[0080] 20. Cold storage body;

[0081] 21. Cold storage room;

[0082] 22. Transition room;

[0083] 23. Equipment room;

[0084] 24. Outer wall;

[0085] 24A, cold storage exterior door;

[0086] 25. First partition wall;

[0087] 26. Second partition wall;

[0088] 30. Fresh air system;

[0089] 31. Fresh air blower;

[0090] 32. New air duct;

[0091] 321. Cold storage room pipe section;

[0092] 322. Pipe section between equipment;

[0093] 32A, cold storage room vents;

[0094] 32B, transition room vents;

[0095] 32C, air duct confined space;

[0096] 33. Cold storage room ventilation valve;

[0097] 34. Air duct control valve;

[0098] 35. Transition ventilation valve;

[0099] 39. Fresh air control valve group

[0100] 41. Controller;

[0101] 42. Parameter detection device;

[0102] 43. Cold storage room pressure detection device;

[0103] 44. Refrigerated room temperature detection device;

[0104] 45. Transition room pressure detection device;

[0105] 46. ​​Transition room temperature detection device;

[0106] 47. External pressure detection device;

[0107] 48. Fresh air duct pressure detection device;

[0108] 49. Fresh air duct temperature detection device. DETAILED DESCRIPTION

[0109] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0110] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0111] In the description of this application, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0112] In the description of this application, it should be understood that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of this application; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0113] like Figures 1 to 2 As shown, in order to facilitate opening the cold storage door of a fresh-keeping cold storage, an embodiment of the present application provides a fresh-keeping cold storage. The fresh-keeping cold storage includes a cold storage body 20, a fresh air system 30 and a pressure regulating device. The cold storage body 20 includes an internal space and at least one cold storage door. The cold storage door is used to connect the internal space with the outside of the cold storage body 20 or to connect different subspaces of the internal space. The fresh air system 30 is used to deliver fresh air to the internal space. The pressure regulating device is operably coupled to the fresh air system 30 and is configured to manipulate the fresh air system 30 to reduce the pressure difference on both sides of the cold storage door to facilitate opening the cold storage door.

[0114] In the fresh-keeping cold storage of the embodiment of the present application, the pressure regulating device can reduce the pressure difference on both sides of the cold storage door by operating the fresh air system, thereby facilitating the opening of the cold storage door.

[0115] like Figure 1As shown, in some embodiments of the fresh-keeping cold storage, the cold storage body 20 includes an outer wall 24 and a first partition wall 25, the outer wall encloses the internal space of the cold storage body 20, the internal space includes a plurality of subspaces, the plurality of subspaces include a cold storage room 21 and a transition room 22, the first partition wall 25 is located between the cold storage room 21 and the transition room 22 to separate the cold storage room 21 and the transition room 22, at least one cold storage door includes a cold storage outer door 24A provided on the outer wall 24 for connecting the outside of the cold storage body 20 with the transition room 22 and a cold storage inner door (not shown) provided on the first partition wall 25 for connecting the transition room 22 and the first partition wall 25; the fresh air system 30 includes a fresh air fan 31, a fresh air duct 32 and a fresh air control valve group 39, the fresh air fan 31 is configured to deliver fresh air to the fresh air duct 32, the fresh air duct 32 includes a The cold storage room vent 32A and the transition room vent 32B are respectively connected to the storage room 21 and the transition room 22, and the fresh air control valve group 39 is configured to adjust the ventilation volume of the cold storage room vent 32A and the transition room vent 32B; the pressure regulating device includes a controller 41 which is signal-connected to the fresh air fan 31 and the fresh air control valve group 39, and the controller 41 is configured to: operate the fresh air fan 31 and at least part of the equipment in the fresh air control valve group 39 to adjust the pressure of the transition room 22, so as to reduce the pressure difference between the transition room 22 and the outside of the cold storage body 20 to facilitate opening the cold storage outer door 24A; and / or operate the fresh air fan 31 and at least part of the equipment in the fresh air control valve group 39 to adjust the pressure of at least one of the cold storage room 21 and the transition room 22, so as to reduce the pressure difference between the transition room 22 and the cold storage room 21 to facilitate opening the cold storage inner door.

[0116] The controller 41 can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0117] The number of the cold storage room vents 32A can be one or more. Figure 1 In the illustrated embodiment, there are a plurality of cold storage compartment vents 32A.

[0118] The number of the transition vents 32B can be one or more. Figure 1 In the illustrated embodiment, the number of the transition vent 32B is one.

[0119] In some embodiments of the fresh-keeping cold storage, the fresh air control valve assembly 39 includes a cold storage ventilation valve 33, a transition room ventilation valve 35, and an air duct control valve 34. The cold storage ventilation valve 33 is configured to control the ventilation volume of the cold storage vent 32A. The transition room ventilation valve 35 is configured to control the ventilation volume of the transition room vent 32B. The air duct control valve 34 is disposed within the fresh air duct 32 and located between the cold storage vent 32A and the transition room vent 32B. It is configured to adjust the ventilation volume from the fresh air duct 32 to the transition room vent 32B.

[0120] The number of cold storage room ventilation valves 33 corresponds to the number of cold storage room ventilation openings 32A. Figure 1 In the illustrated embodiment, a plurality of refrigerating room ventilation valves 33 are provided to accommodate a plurality of refrigerating room ventilation openings 32A, and each refrigerating room ventilation valve 33 adjusts the opening of the corresponding refrigerating room ventilation opening 32A.

[0121] The number of the transition ventilation valves 35 corresponds to the number of the transition ventilation ports 32B. Figure 1 In the embodiment shown, a transition vent valve 35 is provided for a transition vent opening 32B.

[0122] like Figure 1 As shown, the fresh air duct 32 includes a cold storage room pipe section 321 located in the cold storage room 21 and a transition room pipe section 322 located in the transition room 22. The fresh air duct 32 has a cold storage room vent 32A and a transition room vent 32B respectively arranged on the cold storage room pipe section 321 and located on the transition room pipe section 322.

[0123] like Figure 1 As shown, the fresh air fan 31 is located at one end of the fresh air duct 32 away from the transition room 22, in the internal space downstream of the air duct control valve 34 of the fresh air duct 32, and a closed air duct space 32C is formed when the air duct control valve 34 and the transition room ventilation valve 35 are both closed.

[0124] In some embodiments, the fresh air fan 31 , the cold storage room ventilation valve 33 , the transition room ventilation valve 35 and the air duct control valve 34 are all connected to the controller 41 by signal.

[0125] like Figure 2 As shown, in some embodiments of the fresh-keeping cold storage, the pressure regulating device includes a parameter detection device 42, which is configured to detect at least one of the gas parameters inside the cold storage room 21, inside the transition room 22, at the transition room vent 32B in the fresh air duct 32, and outside the cold storage body 20; the controller 41 is connected to the parameter detection device 42 by signal, and is configured to control the operation of at least part of the equipment in the fresh air fan 31 and the fresh air control valve group 39 according to the gas parameters detected by the parameter detection device 42.

[0126] In some embodiments of the fresh-keeping cold storage, the gas parameter includes at least one of gas temperature and gas pressure.

[0127] like Figure 1 As shown, in some embodiments of the fresh-keeping cold storage, the parameter detection device 42 includes: a cold storage room pressure detection device 43, configured to detect the gas pressure in the cold storage room 21; and / or a cold storage room temperature detection device 44, configured to detect the gas temperature in the cold storage room 21; and / or a transition room pressure detection device 45, configured to detect the gas pressure in the transition room 22; and / or a transition room temperature detection device 46, configured to detect the gas temperature in the transition room 22; and / or a cold storage external pressure detection device 47, configured to detect the gas pressure outside the cold storage body 20; and / or a fresh air duct pressure detection device 48, configured to detect the gas pressure at the transition room vent 32B in the fresh air duct 32; and / or a fresh air duct temperature detection device 49, configured to detect the gas temperature at the transition room vent 32B in the fresh air duct 32. Each temperature detection device is, for example, a temperature sensor, and each pressure detection device is, for example, a pressure sensor.

[0128] In some embodiments of the fresh-keeping cold storage, the cold storage room pressure detection device 43, the cold storage room temperature detection device 44, the transition room pressure detection device 45, the transition room temperature detection device 46, the cold storage external pressure detection device 47, the fresh air duct pressure detection device 48 and the fresh air duct temperature detection device 49 are all connected to the controller 41 by signal.

[0129] like Figure 1 As shown, in some embodiments of the fresh-keeping cold storage, the cold storage body 20 also includes a second partition wall 26, and the multiple subspaces of the cold storage body 20 also include an equipment room 23. The second partition wall 26 is located between the equipment room 23 and the cold storage room 21 to separate the equipment room 23 from the cold storage room 21, and the fresh air fan 31 is located in the equipment room 23.

[0130] The fresh-keeping cold storage further includes a refrigeration system, which is configured to adjust the air temperature and / or humidity in the refrigerated room 21 .

[0131] The embodiment of the present application further provides a door opening control method for a fresh-keeping cold storage according to the embodiment of the present application. The door opening control method includes: before opening the cold storage door, operating the fresh air system 30 to reduce the pressure difference on both sides of the cold storage door.

[0132] In some embodiments of the door opening control method of the fresh-keeping cold storage, the cold storage body 20 includes an outer wall 24 and a first partition wall 25, the outer wall encloses the internal space of the cold storage body 20, the internal space includes multiple subspaces, the multiple subspaces include a cold storage room 21 and a transition room 22, the first partition wall 25 is located between the cold storage room 21 and the transition room 22 to separate the cold storage room 21 and the transition room 22, at least one cold storage door includes a cold storage outer door 24A provided on the outer wall 24 for connecting the outside of the cold storage body 20 with the transition room 22 and a cold storage inner door provided on the first partition wall 25 for connecting the transition room 22 with the first partition wall 25; the fresh air system 30 includes a fresh air fan 31, a fresh air duct 32 and a fresh air control valve group 39, the fresh air fan 31 is configured to deliver fresh air to the fresh air duct 32, the fresh air duct 32 includes a valve group connected to the cold storage body 20, and the fresh air fan 31 is configured to deliver fresh air to the fresh air duct 32. The cold storage room vent 32A and the transition room vent 32B are respectively connected to the storage room 21 and the transition room 22, and the fresh air control valve group 39 is configured to adjust the ventilation volume of the cold storage room vent 32A and the transition room vent 32B; the pressure regulating device includes a controller 41 which is signal-connected to the fresh air fan 31 and the fresh air control valve group 39, and the controller 41 is configured to: operate the fresh air fan 31 and at least part of the equipment in the fresh air control valve group 39 to adjust the pressure of the transition room 22, so as to reduce the pressure difference between the transition room 22 and the outside of the cold storage body 20 to facilitate opening the cold storage outer door 24A; and / or operate the fresh air fan 31 and at least part of the equipment in the fresh air control valve group 39 to adjust the pressure of at least one of the cold storage room 21 and the transition room 22, so as to reduce the pressure difference between the transition room 22 and the cold storage room 21 to facilitate opening the cold storage inner door.

[0133] Among them, the door opening control method includes: before opening the outer door 24A of the cold storage, executing step A1, step A1 includes: operating the fresh air fan 31 and at least a part of the equipment in the fresh air control valve group 39 to adjust the pressure of the transition room 22 to reduce the pressure difference between the transition room 22 and the outside of the cold storage body 20; and / or before opening the inner door of the cold storage, executing step A2, step A2 includes: operating the fresh air fan 31 and at least a part of the equipment in the fresh air control valve group 39 to adjust the pressure of at least one of the refrigerated room 21 and the transition room 22 to reduce the pressure difference between the transition room 22 and the refrigerated room 21.

[0134] In some embodiments of the door opening control method for a fresh cold storage, the door opening control method includes:

[0135] Before opening the cold storage outer door 24A, if the air pressure P2 in the transition room 22 is less than the air pressure P outside the cold storage 20, step A1 is executed; and / or

[0136] Before opening the cold storage door, when the air pressure P1 in the cold storage room 21 is lower than the air pressure P2 in the transition room 22, step A2 is executed.

[0137] In some embodiments of the door opening control method of the fresh cold storage, the fresh air control valve group 39 includes a cold storage ventilation valve 33, a transition room ventilation valve 35 and an air duct control valve 34. The cold storage ventilation valve 33 is configured to control the ventilation volume of the cold storage vent 32A, the transition room ventilation valve 35 is configured to control the ventilation volume of the transition room vent 32B, and the air duct control valve 34 is arranged in the fresh air duct 32 and is located between the cold storage vent 32A and the transition room vent 32B. It is configured to adjust the ventilation volume from the fresh air duct 32 to the transition room vent 32B; wherein,

[0138] When the cold storage room 21 does not need fresh air, step A1 includes: turning on the fresh air blower 31, closing the cold storage room ventilation valve 33, opening the air duct control valve 34 and the transition room ventilation valve 35; and / or

[0139] When the cold storage room 21 does not need fresh air, step A2 includes: opening the air duct control valve 34 and the transition room ventilation valve 35, opening the cold storage room ventilation valve 33, and closing the fresh air blower 31; and / or

[0140] When fresh air is needed in the cold storage room 21, step A1 includes: adjusting the cold storage room ventilation valve 33 so that the total ventilation volume of all cold storage room vents 32A is lower than the maximum ventilation volume or is zero, opening the air duct control valve 34, and closing the transition room ventilation valve 35. When the preset conditions are met, closing the air duct control valve 34 and opening the transition room ventilation valve 35; and / or

[0141] When the cold storage room 21 needs fresh air, step A2 includes: opening the air duct control valve 34 and the transition room ventilation valve 35 .

[0142] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 does not need fresh air, in step A1, the air duct control valve 34 is fully opened and / or the transition room ventilation valve 35 is fully opened.

[0143] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room 21 does not need fresh air, step A1 is executed and after the cold storage outer door 24A is opened, the air duct control valve 34 and the transition room ventilation valve 35 are closed, and the cold storage room ventilation valve 33 is opened.

[0144] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 does not need fresh air, in step A2, at least one of the air duct control valve 34, the transition room ventilation valve 35 and the cold storage room ventilation valve 33 is fully opened.

[0145] In some embodiments of the door opening control method for a fresh-keeping cold storage, when the cold storage room 21 does not need fresh air, step A2 is executed and after the cold storage inner door is opened, the air duct control valve 34 and the transition room ventilation valve 35 are closed.

[0146] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 needs fresh air, in step A1, before the preset condition is reached, the smaller P2 is, the cold storage room ventilation valve 33 is adjusted to reduce the total ventilation volume.

[0147] In some embodiments of the door opening control method of the fresh-keeping cold storage, when fresh air is needed in the cold storage room 21, in step A1, before the preset condition is reached, when P2 ≥ 90% P, the cold storage room ventilation valve 33 is adjusted to make the total ventilation volume 85-95% of the maximum ventilation volume; and / or when 90% P>P2 ≥ 80% P, the total ventilation volume is 75-85% of the maximum ventilation volume; and / or when 80% P>P2 ≥ 70% P, the total ventilation volume is 55-65% of the maximum ventilation volume; and / or when 50% P>P2, all the cold storage room ventilation valves 33 are closed to make the total ventilation volume zero.

[0148] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 needs fresh air, in step A1, the preset condition is that the fresh air pipe pressure detection device 48 detects that the pressure P0 is greater than P3, wherein,

[0149]

[0150] T2 is the air temperature in the transition room; V2 is the volume of the transition room; T3 is the gas temperature at the transition room vent 32B in the fresh air duct 32; V3 is the volume of the air duct enclosed space 32C in the fresh air duct 32 downstream of the air duct control valve 34.

[0151] In some embodiments of the door opening control method for a fresh-keeping cold storage, a preset condition is that the fresh air duct pressure detection device 48 detects that the pressure P0 is greater than or equal to 1.1 times P3.

[0152] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 needs fresh air, in step A1, after a preset condition is met, the cold storage room ventilation valve 33 is fully opened.

[0153] In some embodiments of the door opening control method for a fresh cold storage, when the cold storage room 21 needs fresh air, in step A2, the transition room ventilation valve 35 is fully opened, and the larger P1 is, the smaller the opening of the air duct control valve 34 is.

[0154] In some embodiments of the door opening control method of the fresh-keeping cold storage, when P1 ≥ 90% P2, the air duct control valve 34 is maintained at 5-15% opening; and / or when 90% P2 > P1 ≥ 80% P2, the air duct control valve 34 is maintained at 25-30% opening; and / or when 80% P2 > P1 ≥ 70% P2, the air duct control valve 34 is maintained at 40-60% opening; and / or when 50% P2 > P1, the air duct control valve 34 is fully opened.

[0155] In the various parameters involved in the embodiments of this application, the unit of pressure is Pa; the unit of temperature is K; the unit of volume is m 3 .

[0156] The door opening control method of the fresh-keeping cold storage in the embodiment of the present disclosure has the same advantages as the corresponding fresh-keeping cold storage.

[0157] The following is about this application Figures 1 to 2 A feasible example of a door opening control method of the fresh-keeping cold storage of the embodiment shown is described in more detail.

[0158] When fresh air is not needed in the cold storage room 21 and the cold storage outer door 24A needs to be opened, the transition room pressure detection device 45 detects the air pressure P2 in the transition room, and the external pressure detection device 47 detects the air pressure P outside the cold storage body 20. When P2 ≥ P, the cold storage outer door 24A can be opened directly. When P2 < P, the fresh air blower 31 is turned on, the cold storage room ventilation valve 33 is closed to close the cold storage room vent 32A, the air duct control valve 34 is fully opened, and the transition room ventilation valve 35 is fully opened. After the cold storage outer door 24A is opened, the air duct control valve 34 and the transition room ventilation valve 35 are closed, and the cold storage room vent 32A is fully opened by fully opening the cold storage room ventilation valve 33.

[0159] When fresh air is not needed in the cold storage room 21 and the cold storage interior door needs to be opened, the cold storage room pressure detection device 43 detects the air pressure in the cold storage room 21 as P1, and the transition room pressure detection device 45 detects the air pressure in the transition room as P2. When P1 ≥ P2, the cold storage interior door can be opened directly. When P2 < P1, the air duct control valve 34 is fully opened, the transition room ventilation valve 35 is fully opened, the cold storage room ventilation valve 33 is opened to fully open the cold storage room vent 32A, and the fresh air blower 31 is turned off. After the cold storage interior door is opened, the air duct control valve 34 and the transition room ventilation valve 35 are closed.

[0160] When fresh air is needed in the cold storage room 21 and the cold storage outer door 24A needs to be opened, the cold storage external pressure detection device 47 detects the air pressure outside the cold storage body 20 as P, the transition room pressure detection device 45 detects the air pressure P2 in the transition room 22, the transition room temperature detection device 46 detects the air temperature in the transition room 22 as T2, the volume of the transition room 22 is V2, the fresh air duct temperature detection device 49 detects the air temperature in the air duct enclosed space 32C (the gas temperature at the transition room vent 32B in the fresh air duct 32) as T3, and the volume of the air duct enclosed space 32C is V3. When P2 ≥ P, the door can be opened directly. When P2 < P, P3 is calculated using the following formula:

[0161]

[0162] Open the air duct control valve 34 and close the transition room ventilation valve 35. When P2≥90%P, adjust the cold storage room ventilation valve 33 so that the total ventilation volume of all air duct vents is 90% of the maximum ventilation volume of all air duct vents; when 90%P>P2≥80%P, adjust the cold storage room ventilation valve 33 so that the total ventilation volume of all air duct vents is 80% of the maximum ventilation volume of all air duct vents; when 80%P>P2≥70%P, make the total ventilation volume of all air duct vents 50% of the maximum ventilation volume of all air duct vents; when 50%P>P2, close all cold storage room ventilation valves 33 so that the total ventilation volume of all air duct vents is zero. When the pressure detected by the fresh air duct pressure detection device 48 (the pressure of the air duct enclosed space 32C, that is, the gas pressure at the transition room vent 32B in the fresh air duct 32) P0 reaches 1.1 times of P3 obtained by the calculation formula, the air duct control valve 34 is closed, and at the same time, the transition room ventilation valve 35 and all the cold storage room ventilation valves 33 are opened to make the total ventilation volume of all the cold storage room vents 32A reach the maximum ventilation volume.

[0163] When fresh air is needed in the cold storage room 21 and the cold storage door needs to be opened, the cold storage room pressure detection device 43 detects the air pressure P1 in the cold storage room 21. The transition room pressure detection device 45 detects the air pressure P2 in the transition room 22. When P1 ≥ P2, the cold storage door can be opened directly. When P1 < P2, the pressure differential between the cold storage room 21 and the transition room 22 is adjusted to facilitate opening of the cold storage door. The pressure differential adjustment process is as follows: the transition room ventilation valve 35 is fully opened. When P1 ≥ 90% P2, the air duct control valve 34 is maintained at 10% opening. When 90% P2 > P1 ≥ 80% P2, the air duct control valve 34 is maintained at 30% opening. When 80% P2 > P1 ≥ 70% P2, the air duct control valve 34 is maintained at 50% opening. When 50% P2 > P1, the air duct control valve 34 is fully opened.

[0164] According to the above description, the fresh-keeping cold storage and the door opening control method thereof in the embodiments of the present disclosure can achieve at least one of the following technical effects:

[0165] By adjusting the fresh air system, the pressure difference on both sides of the cold storage door is reduced, making the cold storage door easier to open.

[0166] The fresh air system distinguishes whether the cold storage room has a demand for fresh air and adjusts the pressure difference on both sides of the cold storage door. When the cold storage room does not need fresh air, the pressure can be adjusted without increasing the fresh air. When the cold storage room needs fresh air, the opening of the cold storage room ventilation valve 33 is adjusted to ensure the fresh air delivery as much as possible, and the pressure can be adjusted, which is beneficial to maintaining the gas fresh air demand of the cold storage room of the fresh-keeping cold storage unchanged, so that the impact of the change in gas concentration in the cold storage when the door is opened is small, which is beneficial to maintaining the quality of the items stored in the cold storage room.

[0167] Those skilled in the art will understand that, in the above-mentioned method of a specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0168] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other and will not be repeated herein for the sake of brevity.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions requested for protection in this application.

Claims

1. A fresh-keeping cold storage, characterized in that: include: A cold storage body (20) comprises an internal space and at least one cold storage door, wherein the cold storage door is used to connect the internal space with the outside of the cold storage body (20) or to connect different subspaces of the internal space; a fresh air system (30) for delivering fresh air to the interior space; and A pressure regulating device is operably coupled to the fresh air system (30) and is configured to operate the fresh air system (30) to reduce the pressure difference on both sides of the cold storage door so as to facilitate opening the cold storage door; wherein, The cold storage body (20) includes an outer wall (24) and a first partition wall (25), the outer wall enclosing an inner space of the cold storage body (20), the inner space including a plurality of subspaces, the plurality of subspaces including a cold storage room (21) and a transition room (22), the first partition wall (25) being located between the cold storage room (21) and the transition room (22) to separate the cold storage room (21) and the transition room (22), the at least one cold storage door including a cold storage outer door (24A) provided on the outer wall (24) for connecting the outside of the cold storage body (20) with the transition room (22), and a cold storage inner door provided on the first partition wall (25) for connecting the transition room (22) with the first partition wall (25); The fresh air system (30) comprises a fresh air blower (31), a fresh air duct (32) and a fresh air control valve group (39); the fresh air blower (31) is configured to deliver fresh air into the fresh air duct (32); the fresh air duct (32) comprises a refrigeration room vent (32A) and a transition room vent (32B) respectively connected to the refrigeration room (21) and the transition room (22); the fresh air control valve group (39) is configured to adjust the ventilation volume of the refrigeration room vent (32A) and the transition room vent (32B); The pressure regulating device includes a controller (41) connected to the fresh air blower (31) and the fresh air control valve group (39) by signal, and the controller (41) is configured to: operate at least a part of the fresh air blower (31) and the fresh air control valve group (39) to adjust the pressure of at least one of the cold storage room (21) and the transition room (22), so as to reduce the pressure difference between the transition room (22) and the cold storage room (21) to facilitate opening the inner door of the cold storage.

2. The fresh-keeping cold storage according to claim 1, characterized in that: The controller (41) is further configured to: operate the fresh air blower (31) and at least a portion of the fresh air control valve group (39) to adjust the pressure of the transition room (22) so as to reduce the pressure difference between the transition room (22) and the outside of the cold storage body (20) to facilitate opening the cold storage outer door (24A).

3. The fresh-keeping cold storage according to claim 1, characterized in that: The fresh air control valve group (39) comprises: A cold storage room ventilation valve (33) configured to control the ventilation volume of the cold storage room ventilation opening (32A); a transition vent valve (35) configured to control the ventilation volume of the transition vent (32B); and The air duct control valve (34) is arranged in the fresh air duct (32) and located between the cold storage room vent (32A) and the transition room vent (32B), and is configured to adjust the ventilation volume from the fresh air duct (32) to the transition room vent (32B).

4. The fresh-keeping cold storage according to claim 1, characterized in that: The pressure regulating device includes a parameter detection device (42), and the parameter detection device (42) is configured to detect at least one of the gas parameters inside the cold storage room (21), inside the transition room (22), at the transition room vent (32B) in the fresh air duct (32), and outside the cold storage body (20); The controller (41) is connected to the parameter detection device (42) by signal, and is configured to control the operation of at least part of the fresh air fan (31) and the fresh air control valve group (39) according to the gas parameters detected by the parameter detection device (42).

5. The fresh-keeping cold storage according to claim 4, characterized in that: The gas parameter includes at least one of gas temperature and gas pressure.

6. The fresh-keeping cold storage according to claim 5, characterized in that: The parameter detection device (42) comprises: A cold storage room pressure detection device (43) configured to detect the gas pressure in the cold storage room (21); and / or A cold storage room temperature detection device (44) configured to detect the gas temperature in the cold storage room (21); and / or a transition room pressure detection device (45) configured to detect the gas pressure in the transition room (22); and / or a transition room temperature detection device (46), configured to detect the gas temperature in the transition room (22); and / or A cold storage external pressure detection device (47) configured to detect the gas pressure outside the cold storage body (20); and / or A fresh air duct pressure detection device (48) configured to detect the gas pressure at the transitional vent (32B) in the fresh air duct (32); and / or The fresh air duct temperature detection device (49) is configured to detect the gas temperature at the transitional vent (32B) in the fresh air duct (32).

7. The fresh-keeping cold storage according to any one of claims 1 to 6, characterized in that: The cold storage body (20) further includes a second partition wall (26), and the multiple subspaces of the cold storage body (20) further include an equipment room (23). The second partition wall (26) is located between the equipment room (23) and the cold storage room (21) to separate the equipment room (23) from the cold storage room (21), and the fresh air fan (31) is located in the equipment room (23).

8. The fresh-keeping cold storage according to any one of claims 1 to 6, characterized in that: It also includes a refrigeration system, which is configured to adjust the air temperature and / or humidity in the refrigerated room (21).

9. The door opening control method of a fresh-keeping cold storage according to any one of claims 1 to 8, characterized in that: The door opening control method comprises: before opening the cold storage door, operating the fresh air system (30) to reduce the pressure difference on both sides of the cold storage door.

10. The door opening control method of the fresh-keeping cold storage according to claim 9, characterized in that: The door opening control method comprises: Before opening the cold storage outer door (24A), step A1 is performed, wherein the step A1 comprises: operating at least a portion of the fresh air blower (31) and the fresh air control valve group (39) to adjust the pressure of the transition room (22) to reduce the pressure difference between the transition room (22) and the outside of the cold storage body (20); and / or Before opening the inner door of the cold storage, step A2 is performed, and the step A2 includes: operating the fresh air blower (31) and at least a part of the fresh air control valve group (39) to adjust the pressure of at least one of the cold storage room (21) and the transition room (22) to reduce the pressure difference between the transition room (22) and the cold storage room (21).

11. The door opening control method of the fresh-keeping cold storage according to claim 10, characterized in that: The door opening control method comprises: Before opening the outer door (24A) of the cold storage, when the air pressure P2 in the transition room (22) is less than the air pressure P outside the cold storage (20), performing step A1; and / or Before opening the cold storage inner door, when the air pressure P1 in the cold storage room (21) is lower than the air pressure P2 in the transition room (22), step A2 is performed.

12. The door opening control method of the fresh-keeping cold storage according to claim 11, characterized in that: The fresh air control valve group (39) includes a cold storage room ventilation valve (33), a transition room ventilation valve (35) and an air duct control valve (34), wherein the cold storage room ventilation valve (33) is configured to control the ventilation volume of the cold storage room ventilation port (32A), the transition room ventilation valve (35) is configured to control the ventilation volume of the transition room ventilation port (32B), and the air duct control valve (34) is arranged in the fresh air duct (32) and located between the cold storage room ventilation port (32A) and the transition room ventilation port (32B), and is configured to adjust the ventilation volume from the fresh air duct (32) to the transition room ventilation port (32B); wherein, In the case that the cold storage room (21) does not need fresh air, the step A1 includes: turning on the fresh air blower (31), closing the cold storage room ventilation valve (33), opening the air duct control valve (34) and the transition room ventilation valve (35); and / or In the case where the cold storage room (21) does not require fresh air, the step A2 includes: opening the air duct control valve (34) and the transition room ventilation valve (35), opening the cold storage room ventilation valve (33), and closing the fresh air blower (31); and / or In the case where the cold storage room (21) requires fresh air, the step A1 comprises: adjusting the cold storage room ventilation valve (33) so that the total ventilation volume of all the cold storage room vents (32A) is lower than the maximum ventilation volume or is zero, opening the air duct control valve (34), closing the transition room ventilation valve (35), and after a preset condition is reached, closing the air duct control valve (34) and opening the transition room ventilation valve (35); and / or When the cold storage room (21) requires fresh air, the step A2 includes: opening the air duct control valve (34) and the transition room ventilation valve (35).

13. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) does not need fresh air, in step A1, the air duct control valve (34) is fully opened and / or the transition room ventilation valve (35) is fully opened.

14. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) does not need fresh air, after executing step A1 and the cold storage outer door (24A) is opened, the air duct control valve (34) and the transition room ventilation valve (35) are closed, and the cold storage room ventilation valve (33) is opened.

15. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) does not need fresh air, in step A2, at least one of the air duct control valve (34), the transition room ventilation valve (35) and the cold storage room ventilation valve (33) is fully opened.

16. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) does not need fresh air, step A2 is performed and after the cold storage inner door is opened, the air duct control valve (34) and the transition room ventilation valve (35) are closed.

17. The door opening control method of a fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) requires fresh air, in step A1, before the preset condition is reached, the smaller P2 is, the cold storage room ventilation valve (33) is adjusted to reduce the total ventilation volume.

18. The door opening control method of the fresh-keeping cold storage according to claim 17, characterized in that: In the case where the cold storage room (21) requires fresh air, in step A1, before the preset condition is reached, When P2≥90%P, adjusting the cold storage room ventilation valve (33) so that the total ventilation volume is 85-95% of the maximum ventilation volume; and / or When 90%P>P2≥80%P, the total ventilation volume is 75-85% of the maximum ventilation volume; and / or When 80%P>P2≥70%P, the total ventilation volume is set to 55-65% of the maximum ventilation volume; and / or When 50% P>P2, all the cold storage room ventilation valves (33) are closed to make the total ventilation volume zero.

19. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) requires fresh air, in step A1, the preset condition is that the fresh air pipe pressure detection device (48) detects that the pressure P0 is greater than P3, wherein: T2 is the air temperature in the transition room; V2 is the volume of the transition room (22); T3 is the gas temperature at the transition vent (32B) in the fresh air duct (32); V3 is the volume of the air duct enclosed space (32C) in the fresh air duct (32) downstream of the air duct control valve (34).

20. The door opening control method of the fresh-keeping cold storage according to claim 19, characterized in that: The preset condition is that the fresh air duct pressure detection device (48) detects that the pressure P0 is greater than or equal to 1.1 times P3.

21. The door opening control method of a fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) requires fresh air, in step A1, after the preset condition is met, the cold storage room ventilation valve (33) is fully opened.

22. The door opening control method of the fresh-keeping cold storage according to claim 12, characterized in that: When the cold storage room (21) requires fresh air, in step A2, the transition room ventilation valve (35) is fully opened, and the larger P1 is, the smaller the opening of the air duct control valve (34) is.

23. The door opening control method of the fresh-keeping cold storage according to claim 22, characterized in that: When P1≥90%P2, the air duct control valve (34) is maintained at an opening of 5-15%; and / or When 90% P2> P1≥80% P2, the air duct control valve (34) is maintained at an opening of 25-30%; and / or When 80% P2> P1≥70% P2, the air duct control valve (34) is maintained at an opening of 40-60%; and / or When 50% P2>P1, the air duct control valve (34) is fully opened.

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