CN111137564B - Frost prevention system for cold storage plate for fresh-keeping transport case and control method - Google Patents

Frost prevention system for cold storage plate for fresh-keeping transport case and control method Download PDF

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Publication number
CN111137564B
CN111137564B CN201911360266.6A CN201911360266A CN111137564B CN 111137564 B CN111137564 B CN 111137564B CN 201911360266 A CN201911360266 A CN 201911360266A CN 111137564 B CN111137564 B CN 111137564B
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air
fresh
keeping
area
cold storage
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CN111137564A (en
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郭嘉明
吴旭东
魏鑫钰
吕恩利
曾志雄
曹永峰
陈劲
任俊杰
李慧
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South China Agricultural University
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South China Agricultural University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B65D88/745—Large containers having means for heating, cooling, aerating or other conditioning of contents blowing or injecting heating, cooling or other conditioning fluid inside the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2588/00—Large container
    • B65D2588/74—Large container having means for heating, cooling, aerating or other conditioning of contents
    • B65D2588/743—Large container having means for heating, cooling, aerating or other conditioning of contents blowing or injecting heating, cooling or other conditioning fluid inside the container
    • B65D2588/746—Large container having means for heating, cooling, aerating or other conditioning of contents blowing or injecting heating, cooling or other conditioning fluid inside the container with additional treatment function

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Defrosting Systems (AREA)

Abstract

The application discloses a frost prevention system and a control method for a cold storage plate for a fresh-keeping transport case, wherein a fresh-keeping area and a cold storage area are arranged in the fresh-keeping transport case, and a refrigeration air circulation between the cold storage area and the fresh-keeping area is established by utilizing a blast system, an air inlet duct and an air return duct; a condensing device and a defrosting device are arranged in the air return duct; the side wall of the air return duct is communicated with the fresh-keeping area through a vent pipe, and defrosting air circulation is established by utilizing the defrosting device, the air return duct and the vent pipe; and the air return duct and the ventilation pipe are respectively provided with a closed valve, and the refrigerating air circulation and the defrosting air circulation are switched by adjusting the air blowing system, the closed valves and the defrosting device. Compared with the prior art, this application reduces the moisture that gets into in the cold-storage district air under the condition of the fresh-keeping district humidity level that keeps fresh-keeping transport case to solve the frosting phenomenon on cold-storage plate surface at to a great extent, improve the heat exchange efficiency of cold-storage plate, it is long when improving fresh-keeping transport case's fresh-keeping.

Description

Frost prevention system for cold storage plate for fresh-keeping transport case and control method
Technical Field
The application relates to the field of fresh-keeping transportation equipment, in particular to a frost-proof system and a control method of a cold storage plate for a fresh-keeping transportation box.
Background
In current fruit vegetables transportation equipment that keeps fresh, adopt the cold-storage technique mostly, however at fresh transport case air inner loop in-process, moisture in the air can condense on cold-storage plate surface gradually, leads to cold-storage plate heat transfer efficiency's reduction, and fresh-keeping district air humidity can reduce gradually along with fresh-keeping time increases.
Humidity is an important parameter influencing the fresh-keeping transportation quality of fruits and vegetables, the water content of fresh fruits and vegetables can reach 65% -96%, one of the purposes of keeping the fruits and vegetables fresh is to keep water, reduce the water vapor pressure difference between the storage environment and the fruits and vegetables, and require that the storage environment has proper relative humidity. The proper humidity is controlled in the refrigeration process, so that the drying loss of fruits and vegetables is reduced, and the quality of the fruits and vegetables is guaranteed, therefore, the problem that the cold storage plate in the fresh-keeping transport box frosts is solved, and the important effect on improving the transport quality of the fruits and vegetables is achieved.
Disclosure of Invention
The application aims to provide a frost prevention system and a control method for a cold storage plate for a fresh-keeping transport case, and aims to solve the problem of frost on the surface of the cold storage plate, improve the cold release efficiency of the cold storage plate and improve the cold release time of the fresh-keeping transport case.
In order to realize the task, the following technical scheme is adopted in the application:
a cold storage plate frost prevention system for a fresh-keeping transport case is characterized in that a fresh-keeping area and a cold storage area are arranged in the fresh-keeping transport case, wherein the cold storage area is provided with a cold storage plate, and the cold storage area is separated from the fresh-keeping area through a heat insulation partition plate; an air inlet duct and an air return duct are arranged between the cold storage area and the fresh-keeping area, and refrigeration air circulation between the cold storage area and the fresh-keeping area is established through a blast system, the air inlet duct and the air return duct;
a condensing device and a defrosting device are arranged in the air return duct, and when the air in the fresh-keeping area enters the cold storage area through the air return duct, moisture in the air is condensed on the condensing device; the side wall of the air return duct is communicated with the fresh-keeping area through a vent pipe, and defrosting air circulation is established by utilizing the defrosting device, the air return duct and the vent pipe; and the air return duct and the ventilation pipe are respectively provided with a closed valve, and the refrigerating air circulation and the defrosting air circulation are switched by adjusting the air blowing system, the closed valve, the condensing device and the defrosting device.
Furthermore, the front ends of the air inlet duct and the air return duct are communicated with the cold accumulation area, and the tail ends of the air inlet duct and the air return duct are communicated with the fresh-keeping area; the air blowing system comprises an air inlet machine which is arranged at the tail end of the air inlet duct, and the air outlet of the air inlet machine faces the fresh-keeping area, and a return air fan which is arranged at the tail end of the return air duct, and the air outlet of the air return fan faces the return air duct.
Furthermore, the condensing device comprises a semiconductor refrigeration piece arranged in the air return duct, the semiconductor refrigeration piece is obliquely arranged, the cold end of the semiconductor refrigeration piece faces the tail end of the air return duct, and the hot end of the semiconductor refrigeration piece faces the front end of the air return duct.
Furthermore, the defrosting device comprises an image recognition device which is arranged on one side of the condensing device and used for detecting the frosting thickness on the surface of the condensing device, and a shutter fan which is arranged below the semiconductor refrigerating sheet, wherein an air outlet of the shutter fan faces the inside of the fresh-keeping area.
Furthermore, the system also comprises a controller and a temperature sensor used for detecting the temperature in the fresh-keeping area, the temperature information collected by the temperature sensor is sent to the controller, and the air blowing system, the condensing device, the defrosting device and the closed valve are all controlled by the controller.
Furthermore, the air inlet duct and the air return duct are at least one, and when the air return duct is more than one, the adjacent air return ducts are communicated through the through holes.
Further, the switching the refrigerating air cycle and the defrosting air cycle by adjusting the blower system, the airtight valve, and the condensing device and the defrosting device includes:
when the temperature in the fresh-keeping area exceeds a set first temperature threshold, controlling a sealing valve on a return air duct to open, closing a sealing valve on a vent pipe, simultaneously opening a condensing device, closing a defrosting device, and opening an air inlet machine and a return air machine in an air blowing system, wherein the air blowing system blows cold air in a cold storage area to the fresh-keeping area through an air inlet duct, and simultaneously guides air in the fresh-keeping area to the cold storage area through the return air duct until the temperature in the fresh-keeping area is lower than a set second temperature threshold, so that refrigerated air circulation is established;
when the temperature in the fresh-keeping area is lower than the first temperature threshold, acquiring frosting thickness information on a condensing device by using the image recognition device, and when the thickness exceeds a set thickness threshold, controlling a return fan to be opened, an air inlet fan to be closed, a shutter fan to be opened, a sealing valve on a return air duct to be closed, and a sealing valve on a vent pipe to be opened, wherein the return fan pumps air in the fresh-keeping area out, and the air passes through the condensing device in the return air duct and then returns to the fresh-keeping area through the vent pipe, so that defrosting air circulation is established; in the process, the frost on the condensing device is melted into water drops under the action of flowing air and drops on the shutter fan, and the shutter fan blows the water drops to the fresh-keeping area in the form of water mist.
Furthermore, a guide rail is arranged in the cold accumulation area, the cold accumulation plate is arranged on a fixed frame, and the fixed frame is assembled on the guide rail through a sliding block.
A control method of a cold accumulation plate frost prevention system for a fresh-keeping transport case comprises the following steps:
s1, in the working process of the fresh-keeping transport box, the temperature in the fresh-keeping area is obtained in real time by using a temperature sensor and is judged, when the temperature in the fresh-keeping area is larger than a set first temperature threshold value, refrigerating air circulation is carried out, at the moment, a controller controls a sealing valve on a return air duct to be opened, a condensing device is opened, a defrosting device is closed, an air inlet machine and a return air machine are opened, cold air in the cold-storage area is blown to the fresh-keeping area by the air inlet machine, air in the fresh-keeping area is blown to the cold-storage area by the return air machine, and moisture in the air is condensed on the surface of a semiconductor refrigerating sheet and frosts;
when the temperature in the fresh-keeping area is lower than a set second temperature threshold value, the controller controls the air inlet machine, the air return machine and the condensing device to be closed, and the circulation of the refrigerated air is stopped at the moment;
s2, after the refrigeration air circulation stops, the controller acquires the air temperature of the fresh-keeping area through the temperature sensor and judges, if the temperature is lower than the first temperature threshold value, the frosting thickness information of the surface of the semiconductor refrigeration piece is acquired through the image recognition device, if the frosting thickness exceeds the set thickness threshold value, the defrosting air circulation is entered, at the moment, the controller controls the air return fan to be opened, the louver fan is opened, the sealing valve on the air return channel is closed, the sealing valve on the ventilation pipe is opened to defrost, and the defrosting air circulation is stopped until the frosting on the surface of the semiconductor refrigeration piece is completely removed or the air temperature in the fresh-keeping area is higher than the first temperature threshold value.
The application has the following technical characteristics:
1. the method adopts the mode that the condensing device and the defrosting device are arranged in the air return channel between the cold accumulation area and the fresh-keeping area, so that most of moisture in the air is condensed on the condensing device in the cold accumulation air circulation process, and the moisture filtering effect is achieved; and the condensed moisture returns to the fresh-keeping area again through the defrosting device, so that the loss of air humidity in the fresh-keeping area can be reduced, and the fresh keeping of goods is facilitated.
2. Compared with the prior art, the technical scheme of this application reduces the moisture that gets into in the cold-storage district air under the condition of the fresh-keeping district humidity level that keeps fresh-keeping transport case to solve the frosting phenomenon on cold-storage plate surface at to a great extent, improve the heat exchange efficiency of cold-storage plate, it is long when improving fresh-keeping of fresh-keeping transport case.
Drawings
Fig. 1 is a schematic structural diagram of a cold storage plate frost prevention system applied to a fresh-keeping transport case;
fig. 2 is a flowchart illustrating a control method according to the present application.
The reference numbers in the figures illustrate: the air conditioner comprises an air return fan A, a first air return fan 1, a second air return fan 2, an image recognition device B, a first image recognition device 3, a second image recognition device 4, a semiconductor refrigeration sheet C, a first semiconductor refrigeration sheet 5, a second semiconductor refrigeration sheet 6, a shutter fan D, a first shutter fan 7, a second shutter fan 8, a first sealing valve 9, a second sealing valve 10, a first air return duct 11, a second air return duct 12, a power supply 13, a controller 14, a second heat insulation partition 15, a guide rail 16, a fixing frame 17, a cold storage plate 18, a first heat insulation partition 19, an air inlet duct 20, a fresh-keeping area 21, a temperature sensor 22, a first air inlet fan 23, a second air inlet fan 24, a cold storage area 25, a ventilation pipe 26 and a third sealing valve 27.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The application discloses a cold storage plate frost prevention system for a fresh-keeping transport case, wherein a fresh-keeping area 21 and a cold storage area 25 are arranged in the fresh-keeping transport case, a cold storage plate 18 is arranged in the cold storage area 25, and the cold storage area 25 and the fresh-keeping area 21 are separated by a heat insulation partition plate; an air inlet duct 20 and an air return duct E are arranged between the cold storage area 25 and the fresh-keeping area 21, and a refrigerating air circulation between the cold storage area 25 and the fresh-keeping area 21 is formed by a blast system, the air inlet duct 20 and the air return duct E;
a condensing device and a defrosting device are arranged in the air return channel E, and when the air in the fresh-keeping area 21 enters the cold storage area 25 through the air return channel E, moisture in the air is condensed on the condensing device; the side wall of the air return duct E is communicated with the fresh-keeping area 21 through a vent pipe 26, and defrosting air circulation is established by utilizing the defrosting device, the air return duct E and the vent pipe 26; and the air return duct E and the ventilation pipe 26 are respectively provided with a closed valve, and the refrigerating air circulation and the defrosting air circulation are switched by adjusting the air blowing system, the closed valve and the defrosting device.
The fresh-keeping transport case that this application was used has fresh-keeping district 21 and cold-storage district 25 in, is used for depositing the goods in the fresh-keeping district 21, and cold-storage district 25 then is used for placing cold-storage plate 18, provides cold volume for fresh-keeping district 21. The fresh-keeping area 21 and the cold accumulation area 25 are communicated through the air inlet duct 20 and the air return duct E, and an air blowing system is used for generating internal air circulation, so that cold air in the cold accumulation area 25 returns to the cold accumulation area 25 after passing through the fresh-keeping area 21 to form refrigeration air circulation, and in the process, the temperature of the fresh-keeping area 21 is reduced and the refrigeration air circulation is stopped when a set standard is reached.
In order to solve the problem of frosting on the surface of the cold storage plate 18, a condensing device and a defrosting device are arranged in a return air duct E between the cold storage area 25 and the fresh-keeping area 21, so that most of moisture in the air is condensed on the condensing device in the cold storage air circulation process, the moisture filtering effect is achieved, the moisture in the air entering the cold storage area 25 is reduced, the frosting phenomenon on the surface of the cold storage plate 18 is solved to a great extent, and the heat exchange efficiency of the cold storage plate 18 is improved; and the condensed moisture returns to the fresh-keeping area 21 again through the defrosting device, so that the loss of air humidity in the fresh-keeping area 21 can be reduced, and the fresh keeping of goods is facilitated.
As shown in fig. 1, the front ends of the air inlet duct 20 and the air return duct E are communicated with the cold accumulation area 25, and the tail ends are communicated with the fresh-keeping area 21; the blowing system comprises an air inlet machine F which is arranged at the tail end of the air inlet duct 20 and the air outlet of which faces the fresh-keeping area 21, and a return air machine A which is arranged at the tail end of the return air duct E and the air outlet of which faces the return air duct E. In the example shown in fig. 1, the rear ends of the air inlet duct 20 and the air return duct E are disposed above the fresh food transport box, and both are provided with mounting ports for mounting the air inlet fan F and the air return fan a. Wherein the air outlet of the air inlet machine F faces the fresh-keeping area 21, and the air outlet of the air return machine A faces the interior of the air return channel E, so that after the air inlet machine F and the air return machine A are opened, the air circulation between the cold storage area 25 and the fresh-keeping area 21 can be realized.
In one embodiment of the present application, the condensing device includes a semiconductor cooling plate C disposed in the air return duct E, the semiconductor cooling plate C is disposed obliquely, and its cold end faces the end of the air return duct E, and its hot end faces the front end of the air return duct E. In order to make the semiconductor chilling plates C contact with the largest area without affecting the air flow in the air return duct E, the semiconductor chilling plates C are arranged at an inclination angle of 45 ° in the present embodiment. In the process that the air in the fresh-keeping area 21 passes through the air return duct E, the air is directly contacted with the cold end surface of the semiconductor refrigerating sheet C, and the moisture in the air is condensed and frosted on the cold end surface of the semiconductor refrigerating sheet C; along with the air circulation is continuously carried out, the moisture in the air can be effectively reduced.
After the surface of the semiconductor refrigeration chip C is frosted, a defrosting treatment is required. For this reason, in this application the defroster including set up condensing equipment one side, be used for detecting the image recognition device B of condensing equipment surface frost thickness to and set up shutter fan D in semiconductor refrigeration piece C below, wherein shutter fan D's air outlet is inside towards fresh-keeping zone 21. The image recognition device B comprises an image collector and an image processor, the image collector collects the surface image of the semiconductor refrigerating sheet C, and the image processor compares the surface image with a preset image (namely the image of the surface of the semiconductor refrigerating sheet C when frosting does not occur) to obtain the frosting thickness. When the thickness exceeds a set thickness threshold, for example, 2mm, it is considered that the defrosting operation can be performed at this time. In the defrosting process, air circulation inside the fresh keeping area 21 is established through the air return duct E and the ventilation pipe 26, in the air circulation process, flowing air gradually enables frosting on the surface of the semiconductor refrigerating sheet C to be melted into water drops and to drop on the louver fan D, and the louver fan D blows the water drops to the fresh keeping area 21 in a water mist mode, so that the defrosting function is achieved. That is, the application not only utilizes the inside air in freshness field 21 to defrost, but also the moisture after defrosting returns to freshness field 21, plays a role in increasing the air humidity in freshness field 21, and is favorable for the preservation of goods.
Referring to fig. 1, in order to facilitate automatic adjustment in the fresh-keeping transport box, the system further includes a controller 14 and a temperature sensor 22 for detecting the temperature in the fresh-keeping area 21, the temperature information collected by the temperature sensor 22 is sent to the controller 14, and the blower system, the condensing device, the defrosting device and the sealing valve are all controlled by the controller 14. The closed valves adopted in the scheme are all electromagnetic valves, namely the air inlet fan F, the air return fan A and all the electromagnetic valves are connected to and controlled by the controller 14. In one embodiment of the present application, a region is separated by an insulating plate in the cold storage area 25 for installing the power supply 13 and the controller 14, and the power supply 13 supplies power to the electronic devices and equipment in the whole fresh food transport case. Alternatively, the heat insulation partition plate in the scheme can be a polyurethane partition plate.
Further, the switching between the refrigerating air cycle and the defrosting air cycle by adjusting the blowing system, the sealing valve and the condensing device and the defrosting device is carried out by the following working principle:
when the temperature in the fresh-keeping area 21 exceeds a set first temperature threshold, controlling a closed valve on a return air duct E to open, closing a closed valve on a vent pipe 26, simultaneously opening a condensing device, closing a defrosting device, and opening an air inlet machine F and a return air machine A in an air blowing system, wherein the air blowing system blows cold air in the cold storage area 25 to the fresh-keeping area 21 through an air inlet duct 20, and simultaneously guides air in the fresh-keeping area 21 to the cold storage area 25 through the return air duct E until the temperature in the fresh-keeping area 21 is lower than a set second temperature threshold, so that refrigeration air circulation is established; in one embodiment of the present application, the first temperature threshold is set to 8 ℃ and the second temperature threshold is set to 2 ℃. When the temperature in the preservation area 21 exceeds 8 ℃, the temperature is considered to be too high, and the temperature needs to be reduced, and then the refrigeration air circulation is started; and when the internal temperature is lower than 2 ℃, the internal temperature is low enough, and the temperature reduction is finished.
When the temperature in the fresh-keeping area 21 is lower than the first temperature threshold, acquiring frosting thickness information on a condensing device by using the image recognition device B, and when the thickness exceeds a set thickness threshold, controlling a return fan A to be opened, an air inlet fan F to be closed, a shutter fan D to be opened, a sealing valve on a return air duct E to be closed, and a sealing valve on a vent pipe 26 to be opened, wherein at the moment, the return fan A pumps air in the fresh-keeping area 21 out, and the air returns to the fresh-keeping area 21 through the vent pipe 26 after passing through the condensing device in the return air duct E, so that defrosting air circulation is established; in this process, the frost on the condensing device is melted into water drops under the action of the flowing air and drops on the louver fan D, and the louver fan D blows the water drops to the fresh-keeping area 21 in the form of water mist.
Fig. 1 shows a schematic structural diagram of a cold storage plate frost prevention system applied to a fresh-keeping transport case. In this example, two return air ducts E are provided, and a through hole is provided between the return air ducts E to communicate the insides thereof, so that the defrosting air circulation is formed. In addition, two air return channels E are arranged, so that when defrosting air circulation is carried out, the air return channels E can have more air inlet areas, and the defrosting process can be accelerated to a certain extent.
In the example of fig. 1, there are two air return ducts E, which are a first air return duct 11 and a second air return duct 12; a first air return fan 1, a first image recognition device 3, a first semiconductor refrigeration sheet 5 and a first louver fan 7 are arranged in the first air return duct 11, and a first airtight valve 9 is installed on the first air return duct; correspondingly, a second air return duct 12 is provided with a second air return fan 2, a second image recognition device 4, a second semiconductor refrigeration sheet 6 and a second shutter fan 8, and a second airtight valve 10 is mounted thereon. One air inlet duct 20 is provided, and two air inlet fans F, namely a first air inlet fan 23 and a second air inlet fan 24, are arranged in the air inlet duct 20. The closing valve installed on the ventilation pipe 26 is denoted as a third closing valve 27; the cold storage area 25 is separated from the fresh-keeping area 21 by a first heat-insulating partition 19, and is separated from the power supply and the controller by a second heat-insulating partition 15.
In this embodiment, the air inlet fan F and the air return fan a may be G-100A variable frequency fans, the semiconductor cooling plate C may be TEC1-12715, the louver fan D may be APB side wall type ventilation fan, the sealing valve may be D (9)40X-0.5DN200 electric sealing valve, the temperature sensor 22 may be PT100 sensor, and the image collector may be a drive-free camera composed of a CMOS photosensitive element and a focus lens.
In this embodiment, the cold storage area 25 is provided with a guide rail 16, the cold storage plate 18 is mounted on a fixed frame 17, and the fixed frame 17 is assembled on the guide rail 16 through a sliding block, so as to facilitate the disassembly of the cold storage plate 18.
On the basis of the above technical scheme, referring to fig. 2, the application further provides a control method of a cold storage plate frost prevention system for a fresh-keeping transport case, comprising the following steps:
s1, in the working process of the fresh-keeping transport box, the temperature sensor 22 is used for acquiring the temperature in the fresh-keeping area 21 in real time and judging the temperature, when the temperature in the fresh-keeping area 21 is higher than a set first temperature threshold value of 8 ℃, refrigerating air circulation is carried out, the controller 14 controls a sealing valve on an air return channel E to be opened, a condensing device is opened, a defrosting device is closed, an air inlet machine F and an air return machine A are opened, the air inlet machine F blows cold air in the cold-storage area 25 to the fresh-keeping area 21, the air return machine A blows air in the fresh-keeping area 21 to the cold-storage area 25, and moisture in the air is condensed on the surface of the refrigerating semiconductor chip C and frosts;
when the temperature in the fresh-keeping area 21 is lower than the set second temperature threshold value by 2 ℃, the controller 14 controls the air inlet fan F, the air return fan A and the condensing device to be closed, and the circulation of the refrigerated air is stopped at the moment;
and S2, after the refrigeration air circulation stops, the controller 14 acquires the air temperature of the fresh-keeping area 21 through the temperature sensor 22 and judges, if the temperature is lower than the first temperature threshold value of 8 ℃, the frosting thickness information of the surface of the semiconductor refrigeration piece C is acquired through the image recognition device B, if the frosting thickness exceeds the set thickness threshold value of 2mm, the defrosting air circulation is started, at the moment, the controller 14 controls the air return fan A to be opened, the shutter fan D to be opened, the sealing valve on the air return duct E to be closed, and the sealing valve on the ventilation pipe 26 to be opened to defrost until the frosting on the surface of the semiconductor refrigeration piece C is completely removed, or the air temperature in the fresh-keeping area 21 is higher than the first temperature threshold value of 8 ℃, the defrosting air circulation is stopped, so that the fresh-keeping area 21 always keeps constant humidity, and the humidity of the cold storage area 25 always keeps the lowest.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A cold storage plate frost prevention system for a fresh-keeping transport case is characterized in that a fresh-keeping area (21) and a cold storage area (25) are arranged in the fresh-keeping transport case, wherein a cold storage plate (18) is arranged in the cold storage area (25), and the cold storage area (25) is separated from the fresh-keeping area (21) through a heat insulation partition plate; an air inlet duct (20) and an air return duct (E) are arranged between the cold storage area (25) and the fresh-keeping area (21), and refrigeration air circulation between the cold storage area (25) and the fresh-keeping area (21) is established through a blast system, the air inlet duct (20) and the air return duct (E);
a condensing device and a defrosting device are arranged in the air return channel (E), and when the air in the fresh-keeping area (21) enters the cold storage area (25) through the air return channel (E), the moisture in the air is condensed on the condensing device; the side wall of the air return duct (E) is communicated with the fresh-keeping area (21) through a vent pipe (26), and a defrosting air circulation is established by utilizing the defrosting device, the air return duct (E) and the vent pipe (26); and the air return duct (E) and the ventilation duct (26) are respectively provided with a closed valve, and the refrigerating air circulation and the defrosting air circulation are switched by adjusting the air blowing system, the closed valve, the condensing device and the defrosting device.
2. The cold storage plate frost prevention system for the fresh-keeping transport box according to claim 1, wherein the front ends of the air inlet duct (20) and the air return duct (E) are communicated with the cold storage area (25), and the tail ends are communicated with the fresh-keeping area (21); the air blowing system comprises an air inlet machine (F) which is arranged at the tail end of an air inlet duct (20) and an air outlet of which faces a fresh-keeping area (21), and an air return machine (A) which is arranged at the tail end of an air return duct (E) and of which the air outlet faces the air return duct (E).
3. The cold storage plate frost prevention system for the fresh-keeping transport box as claimed in claim 2, wherein the condensing device comprises a semiconductor cooling plate (C) disposed in the air return duct (E), the semiconductor cooling plate (C) is disposed in an inclined manner, the cold end of the semiconductor cooling plate faces the end of the air return duct (E), and the hot end of the semiconductor cooling plate faces the front end of the air return duct (E).
4. The cold storage plate frost prevention system for the fresh-keeping transport box according to claim 3, wherein the defrosting device comprises an image recognition device (B) disposed at one side of the condensing device for detecting the frost thickness on the surface of the condensing device, and a louver fan (D) disposed below the semiconductor refrigerating sheet (C), wherein an air outlet of the louver fan (D) faces the inside of the fresh-keeping section (21).
5. The cold storage plate frost prevention system for the fresh-keeping transport box according to claim 4, wherein the system further comprises a controller (14) and a temperature sensor (22) for detecting the temperature in the fresh-keeping area (21), the temperature information collected by the temperature sensor (22) is sent to the controller (14), and the air blowing system, the condensing device, the defrosting device and the sealing valve are all controlled by the controller (14).
6. The cold storage plate frost prevention system for the fresh-keeping transport case as claimed in claim 1, wherein at least one of the air inlet duct (20) and the air return duct (E) is provided, and when more than one air return duct (E) is provided, the adjacent air return ducts (E) are communicated with each other through the through hole.
7. The cold-storage plate frost prevention system for fresh-keeping transport box according to claim 4, wherein said switching of the refrigerating air cycle and the defrosting air cycle by adjusting the blowing system, the sealing valve, and the condensing device and the defrosting device comprises:
when the temperature in the fresh-keeping area (21) exceeds a set first temperature threshold, controlling a closed valve on a return air duct (E) to open, closing a closed valve on a vent pipe (26), simultaneously opening a condensing device, closing a defrosting device, and opening an air inlet machine (F) and a return air machine (A) in an air blowing system, wherein the air blowing system blows cold air in a cold storage area (25) to the fresh-keeping area (21) through an air inlet duct (20), and simultaneously guides air in the fresh-keeping area (21) to the cold storage area (25) through the return air duct (E) until the temperature in the fresh-keeping area (21) is lower than a set second temperature threshold, so that refrigeration air circulation is established;
when the temperature in the fresh-keeping area (21) is lower than the first temperature threshold, acquiring frosting thickness information on a condensing device by using the image recognition device (B), and when the thickness exceeds a set thickness threshold, controlling a return fan (A) to be opened, an air inlet machine (F) to be closed, a shutter fan (D) to be opened, a sealing valve on a return air duct (E) to be closed, and a sealing valve on a vent pipe (26) to be opened, wherein the return fan (A) pumps air in the fresh-keeping area (21) out, and the air returns to the fresh-keeping area (21) through the vent pipe (26) after passing through the condensing device in the return air duct (E), so that defrosting air circulation is established; in the process, the frost on the condensing device is melted into water drops under the action of flowing air and drops on the louver fan (D), and the louver fan (D) blows the water drops to the fresh-keeping area (21) in the form of water mist.
8. The cold-storage plate frost prevention system for fresh-keeping transport case of claim 7, wherein the first temperature threshold is 8 ℃, the second temperature threshold is 2 ℃, and the thickness threshold is 2 mm.
9. The cold storage plate frost prevention system for the fresh-keeping transport box according to claim 1, wherein a guide rail (16) is provided in the cold storage area (25), the cold storage plate (18) is mounted on a fixing frame (17), and the fixing frame (17) is assembled on the guide rail (16) through a slider.
10. The control method of the cold accumulation plate frost prevention system for the fresh-keeping transport case according to claim 5, characterized by comprising the steps of:
s1, in the working process of the fresh-keeping transport box, the temperature in the fresh-keeping area (21) is obtained in real time by using the temperature sensor (22) and is judged, when the temperature in the fresh-keeping area (21) is greater than a set first temperature threshold value, refrigerating air circulation is carried out, at the moment, the controller (14) controls a sealing valve on the air return channel (E) to be opened, a condensing device is opened, a defrosting device is closed, an air inlet machine (F) and an air return machine (A) are opened, the air inlet machine (F) blows cold air in the cold-keeping area (25) to the fresh-keeping area (21), the air return machine (A) blows air in the fresh-keeping area (21) to the cold-keeping area (25), and moisture in the air is condensed on the surface of the semiconductor refrigerating sheet (C) and frosts;
when the temperature in the fresh-keeping area (21) is lower than a set second temperature threshold value, the controller (14) controls the air inlet fan (F), the air return fan (A) and the condensing device to be closed, and at the moment, the circulation of the refrigerated air is stopped;
s2, after the refrigeration air circulation stops, the controller (14) obtains the air temperature of the fresh-keeping area (21) through the temperature sensor (22) and judges, if the temperature is lower than the first temperature threshold, the frosting thickness information of the surface of the semiconductor refrigerating sheet (C) is obtained through the image recognition device (B), if the frosting thickness exceeds the set thickness threshold, the defrosting air circulation is entered, at the moment, the controller (14) controls the air return fan (A) to be opened, the shutter fan (D) to be opened, the sealing valve on the air return channel (E) to be closed, the sealing valve on the ventilation pipe (26) is opened to perform defrosting work, and the defrosting air circulation is stopped until the frosting on the surface of the semiconductor refrigerating sheet (C) is completely removed or the air temperature in the fresh-keeping area (21) is higher than the first temperature threshold.
CN201911360266.6A 2019-12-25 2019-12-25 Frost prevention system for cold storage plate for fresh-keeping transport case and control method Active CN111137564B (en)

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