Freezing display cabinet

Abstract

The invention provides a freezing display cabinet which comprises a cabinet body, an inner container is arranged in the cabinet body and used for containing articles, and an opening is formed in one side of the cabinet body; the cabinet door is arranged at the position of the opening, and the cabinet door is used for closing or opening the opening; the first air duct assembly produces low-temperature air to refrigerate the interior of the cabinet body, the first air duct assembly comprises a first air duct, a first fan and a first evaporator, and the first fan and the first evaporator are installed in the first air duct; the second air duct assembly is used for manufacturing an air curtain to separate air inside and outside the cabinet body and comprises a second air duct, a second fan and a second evaporator, and the second fan and the second evaporator are installed in the second air duct; and the heat preservation curtain is arranged in the second air duct and can shield the inner side of the cabinet door when power is off, so that the melting rate of articles placed in the cabinet body is slowed down.

Description

Technical Field

[0001] The invention relates to the technical field of display cabinets and provides a refrigerated display cabinet. Background Art

[0002] Most of the existing frozen display cabinets use air-cooled frost-free technology. The air duct in the cabinet uses a fan to suck air, and the air flows into the cabinet through the evaporator. When the door is opened, the evaporation fan will stop to reduce the impact on the cold air in the cabinet. This will cause some problems. First, when the ambient temperature is high, the evaporation fan stops, the cabinet temperature rises quickly, and it takes time to pull the temperature to the storage temperature. When the door is opened for a long time or the frequency of opening the door is high, the temperature in the cabinet rises sharply, and it is easy to freeze the goods if the temperature is not pulled in time; second, when the environment is high in humidity, the high-humidity gas in the environment enters the evaporator in the cabinet, which will aggravate the frost on the evaporator. When the evaporator is frosted, the refrigeration capacity decreases, which is more unfavorable for cooling the cabinet.

[0003] At present, the temperature-inducing ability of smart ice cream display cabinets is relatively weak, mainly because the structure and the way the ice cream is placed occupy the air duct, resulting in poor air circulation and the inability to lower the temperature inside the cabinet. Once the door is opened frequently, the cabinet temperature rises to a certain value, causing the problem of melting goods, which will affect customer use. In addition, when the display cabinet encounters a power outage, the display cabinet has poor insulation ability, and the goods placed in the display cabinet are easy to melt, causing huge losses to merchants. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a refrigerated display cabinet, comprising:

[0005] A cabinet body, wherein an inner container is provided in the cabinet body for placing items, and an opening is provided on one side of the cabinet body;

[0006] A cabinet door, which is arranged at the opening and is used to close or open the opening;

[0007] A first air duct component, the first air duct component produces low-temperature air for cooling in the cabinet, comprising a first air duct, a first fan and a first evaporator, wherein the first fan and the first evaporator are installed in the first air duct;

[0008] A second air duct component, the second air duct component creates an air curtain to separate the air inside and outside the cabinet, comprises a second air duct, a second fan and a second evaporator, the second fan and the second evaporator are installed in the second air duct;

[0009] The thermal insulation curtain is arranged in the second air duct and can be blocked on the inner side of the cabinet door when the power is off, thereby slowing down the melting rate of the items placed in the cabinet.

[0010] Specifically, the thermal insulation curtain includes two rotatable driving wheels and a passive wheel installed in the second air duct, and a curtain body wrapped around the driving wheel and the passive wheel. A stepping motor that can drive the driving wheel to rotate is coaxially arranged on one side of the driving wheel. One end of the curtain body is connected to the driving wheel, and the other end of the curtain body is freely hanging, and a weight is arranged at the hanging end of the curtain body.

[0011] Specifically, the cabinet is provided with a backup power supply that can be switched when power is off, and the stepper motor is connected to the backup power supply. The stepper motor rolls up the thermal insulation curtain when the cabinet is powered on, and starts to lower the thermal insulation curtain when power is off.

[0012] Specifically, the cabinet is provided with an air duct partition installed in the cabinet inner shell, and the air duct partition includes a bottom air duct partition, a rear air duct partition, a top air duct partition and a front air duct partition connected in sequence, and the first air duct and the second air duct are independently arranged, respectively arranged on both sides of the air duct partition, and the low-temperature air of the first air duct is opposite to the wind curtain of the second air duct.

[0013] Specifically, a fan fixing plate is installed in the inner tank flush with the lower end of the front air duct partition, and the fan fixing plate, the air duct partition and the inner tank are combined on the upper side of the inner tank to form a first air duct, and the first fan and the first evaporator are installed on the fan fixing plate. A through hole is provided at the front position of the fan fixing plate, and the first fan is installed on the through hole, which is the air inlet of the first air duct. There is a gap between the fan fixing plate and the rear air duct partition, and the gap is the air outlet of the first air duct.

[0014] Specifically, the duct partition and the cabinet inner tank form a second air duct, the lower end of the front duct partition is the air outlet of the second air duct, the front end of the bottom duct partition is the air inlet of the second air duct, the second fan is arranged at the corner of the second air duct, installed between the rear duct partition and the top duct partition, and the second evaporator is fixedly installed on the back plate of the inner tank.

[0015] Specifically, the curtain body is made of a multi-layer composite material, including a sun protection layer, a thermal insulation layer, a cold storage layer and a base layer which are arranged in sequence from the outside to the inside. The sun protection layer is arranged on the side close to the cabinet door and is made of aluminum foil. The thermal insulation layer is arranged on the inner side of the sun protection layer and is made of thermal insulation cotton. The cold storage layer is arranged on the inner side of the thermal insulation layer. A flexible cold storage material is arranged in the cold storage layer. The base layer is arranged on the side of the curtain body close to the inner chamber of the cabinet and is made of low-temperature resistant PVC material.

[0016] Specifically, a tubular air duct that unidirectionally connects the first air duct and the second air duct is provided on one side of the thermal insulation curtain, the air duct inlet of the tubular air duct is provided at the air outlet end of the first evaporator, and the air duct outlet of the tubular air duct is provided between the driving wheel and the passive wheel. Part of the low-temperature air is transported from the first air duct to the second air duct through the tubular air duct, so that the thermal insulation curtain is maintained in a low-temperature state.

[0017] Specifically, a door detection sensor for obtaining the opening state and opening time of the door is provided at the door, and the operation states of the first air duct assembly and the second air duct assembly are adjusted according to the detection result of the door detection sensor.

[0018] Specifically, it also includes a compressor, a refrigerant storage device, a drying filter, and a condenser connected in sequence. The condenser is connected in parallel with a first low-pressure circuit and a second low-pressure circuit. The first low-pressure circuit includes a first solenoid valve, a first throttling device, a first evaporator and a one-way valve. The second low-pressure circuit includes a second solenoid valve, a second throttling device, a second evaporator and a second one-way valve.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention designs an additional air curtain structure based on the traditional refrigerated display cabinet. When the cabinet door is opened, the air curtain starts to reduce the heat exchange and air exchange inside and outside the cabinet, which can effectively improve the refrigeration efficiency and save energy. When the humidity of the outside air is high, it can also reduce the high-humidity gas in the environment from entering the cabinet, avoiding the high-humidity air from frosting the evaporator and reducing the refrigeration capacity.

[0021] 2. The present invention designs a thermal insulation curtain, which is placed in the second air duct. When a power outage occurs, the thermal insulation curtain can be lowered and shielded on the inner side of the cabinet door to keep the items in the display cabinet warm, slow down the melting rate of the items placed in the display cabinet, and reduce cargo losses.

[0022] 3. The present invention adopts a dual low-pressure circuit design, and the first solenoid valve and the second solenoid valve respectively control the coolant flow and the working state of the evaporator, and the control stability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the refrigeration cycle of the present invention;

[0025] Figure 3 This is a schematic diagram of the air curtain circulation of the present invention;

[0026] Figure 4 This is a schematic diagram of the double circulation of the refrigeration air curtain of the present invention;

[0027] Figure 5 This is a schematic diagram of the use state of the thermal insulation curtain of the present invention;

[0028] Figure 6 This is a schematic diagram of the cooling cycle of the thermal insulation curtain of the present invention;

[0029] Figure 7 It is an exploded view of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the thermal insulation curtain of the present invention;

[0031] Fig. 9 It is a schematic diagram of the tubular air duct structure of the present invention;

[0032] Fig.10 This is a refrigeration principle diagram of the present invention;

[0033] Fig.11 The present invention is a flow chart of a control method.

[0034] Reference numerals: 1, cabinet body; 2, cabinet door; 31, first air duct; 32, first evaporator; 33, first fan; 34, fan fixing plate; 35, fan cover; 41, second air duct; 42, second evaporator; 43, second fan; 5, air duct partition; 51, bottom air duct partition; 52, rear air duct partition; 53, top air duct partition; 54, front air duct partition; 6, thermal insulation curtain; 61, curtain body; 611, sun protection layer; 612, thermal insulation layer; 613, cold storage layer; 614, base layer; 615, protrusion; 62, driving wheel; 621, groove; 63, driven wheel; 64, weight; 7, tubular air duct; 71, air duct inlet; 72, air duct outlet; 73, guide plate; 74, drainage hood; 8, shelf; 91, compressor; 92, refrigerant storage device; 93, drying filter; 94, condenser; 95, first solenoid valve; 96, second solenoid valve; 97, first throttling device; 98, second throttling device; 99, first one-way valve; 910, second one-way valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific implementation of the present invention is described in detail below in combination with specific embodiments.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] A frozen display cabinet includes a cabinet body 1 and a cabinet door 2. The cabinet body 1 is provided with an inner liner for storing items, such as ice cream and other products that need to be frozen. An opening is provided on one side of the cabinet body 1. The cabinet door 2 is movably provided at the opening for closing or opening the opening. The cabinet door 2 is a glass door for customers to select items in the cabinet. The cabinet door 2 can be hinged in the cabinet body 1 or slidably connected to the cabinet door 2. A multi-layer shelf 8 is provided in the cabinet body 1. The shelf 8 is a mesh shelf 8. Items are placed on the shelf 8, and cold air can flow through the gaps of the shelf 8.

[0038] A first air duct assembly and a second air duct assembly are arranged in the cabinet 1. The first air duct assembly includes a first air duct 31, a first evaporator 32 and a first fan 33, which produce low-temperature air to provide a refrigeration cycle in the cabinet 1. The second air duct assembly includes a second air duct 41, a second evaporator 42 and a second fan 43, which produce an air curtain circulation to isolate the air inside and outside the cabinet 1, reduce the heat exchange between the refrigeration chamber and the freezer chamber, and reduce energy consumption.

[0039] A cabinet door 2 detection sensor is provided at the cabinet door 2. The cabinet door 2 detection sensor obtains the switch signal of the cabinet door 2, obtains the opening state and opening time of the cabinet door 2, and starts timing when the cabinet door 2 detection sensor detects that the cabinet door 2 is in the open state. The cabinet door 2 detection sensor can be a magnetic switch, which is matched with the cabinet door 2. The cabinet door 2 detection sensor detects the opening state and opening time of the cabinet door 2, and adjusts the operating state of the first air duct component and the second air duct component accordingly.

[0040] An air duct partition 5 is provided in the cabinet 1, and the first air duct 31 and the second air duct 41 are independently provided, respectively provided on both sides of the air duct partition 5, and the air duct partition 5 includes a bottom air duct partition 51, a rear air duct partition 52, a top air duct partition 53 and a front air duct partition 54 connected in sequence, and the air duct partition 5 is a sheet metal forming part, and is fixedly installed in the inner liner of the cabinet 1. The bottom air duct partition 51 is fixedly installed on the bottom plate of the inner liner of the cabinet 1, the rear air duct partition 52 is fixedly installed on the back plate of the inner liner of the cabinet 1, the top air duct partition 53 is fixedly installed on the top plate of the inner liner of the cabinet 1, and the front air duct partition 54 is fixedly installed on the front plate at the top of the inner liner of the cabinet 1.

[0041] At the top of the inner liner of the cabinet 1, a fan fixing plate 34 is installed flush with the lower end of the front air duct partition 54. The fan fixing plate 34, the air duct partition 5 and the inner liner are enclosed on the upper side of the inner liner to form a first air duct 31. The first fan 33 and the first evaporator 32 are arranged in the first air duct 31 and installed on the fan fixing plate 34. A through hole is arranged at the front position of the fan fixing plate 34. The first fan 33 is installed on the through hole, which is the air inlet of the first air duct 31. A fan cover 35 is installed at the through hole to prevent hands or objects from touching the fan blades. The first evaporator 32 is installed at the rear position of the fan fixing plate 34. The first evaporator 32 is a fin-type evaporator, which is used for cooling in the cabinet 1 to maintain the temperature in the cabinet 1 not lower than the melting temperature of the objects in the cabinet. There is a gap between the fan fixing plate 34 and the rear air duct partition 52, which is the air outlet of the first air duct 31. The first fan 33 draws air into the first air duct 31, and obtains low-temperature air after passing through the first evaporator 32. The low-temperature air flows into the storage cavity from the gap, flows downward under the action of gravity and passes through the shelf 8, providing cooling for the storage cavity of the display cabinet, so that the items in the cabinet body 1 are maintained at a relatively low temperature. After the low-temperature air circulates in the cabinet body 1, the heated low-temperature air is then drawn into the first air duct 31 through the first fan 33, so that the air in the cavity circulates and the items placed in the cavity are frozen.

[0042] The air duct partition 5 and the inner tank of the cabinet 1 form a second air duct 41, and the second evaporator 42 and the second fan 43 are arranged in the second air duct 41. The second evaporator 42 is arranged between the rear air duct partition 52 and the inner wall of the cabinet 1, and is fixedly installed on the back plate of the inner tank. It is a fin-type evaporator, which reduces the air curtain temperature for air curtain cooling. The second fan 43 is arranged at the corner of the second air duct 41, and is installed between the rear air duct partition 52 and the top air duct partition 53. The second fan 43 preferably uses a cross-flow fan, which is small in size and has uniform air volume. The lower end of the front air duct partition 54 is the air outlet of the second air duct 41, and the front end of the bottom air duct partition 51 is the air inlet of the second air duct 41. Under the attraction of the second fan 43, the air is sucked into the second air duct 41 from the front end of the bottom air duct partition 51, and after being cooled by the second evaporator 42 and accelerated by the second fan 43, a uniform wind curtain is formed, which is ejected vertically downward from the lower end of the front air duct partition 54 and sucked into the second air duct 41 through the air inlet of the second air duct 41 arranged below the air outlet of the second air duct 41, thereby realizing the circulation of the wind curtain.

[0043] When the cabinet door 2 is opened, the second fan 43 starts and creates an air curtain. The air curtain serves as the second door of the refrigerated display cabinet. When the door is open, it reduces the heat exchange and air exchange inside and outside the cabinet 1, which can effectively improve the refrigeration efficiency and save energy. When the humidity of the outside air is high, it can also reduce the high humidity gas in the environment from entering the cabinet 1, preventing the high humidity air from frosting the evaporator and reducing the refrigeration capacity.

[0044] The refrigeration system of the display cabinet includes a high-pressure side and a low-pressure side. The high-pressure side includes a compressor 91, a refrigerant storage device 92, a drying filter 93, and a condenser 94. The low-pressure side includes a first low-pressure circuit for refrigerating the cabinet 1 and a second low-pressure circuit for refrigerating the air curtain. The first low-pressure circuit and the second low-pressure circuit are arranged in parallel. The first low-pressure circuit includes a first solenoid valve 95, a first throttling device 97, a first evaporator 32, and a first check valve 99. The second low-pressure circuit includes a second solenoid valve 96, a second throttling device 98, a second evaporator 42, and a second check valve 910. A temperature sensor is arranged in the cabinet 1. The first solenoid valve 95 and the second solenoid valve 96 can adjust and control the flow of the coolant according to the temperature in the cabinet 1, control the refrigeration capacity of the first evaporator 32 and the second evaporator 42, and control the operation state of the first evaporator 32 and the second evaporator 42 according to the cabinet door 2 switch signal obtained by the cabinet door 2 detection sensor. The cooling system is designed with dual low-pressure circuits, and solenoid valves are used for adjustment and control respectively, and the control stability is strong.

[0045] During use, the sealing of one side of the cabinet door 2 of the display cabinet is poor. In order to prevent the temperature inside the cabinet body 1 from rising due to heat exchange with the outside and sunlight after a power outage, causing the items to melt and cause losses to merchants, a thermal insulation curtain 6 is provided on one side of the cabinet door 2 of the display cabinet. When a power outage occurs, the thermal insulation curtain 6 can be lowered and shielded on the inner side of the cabinet door 2 to keep the items in the display cabinet warm, slow down the melting rate of the items placed in the display cabinet, and reduce the loss of goods.

[0046] The heat preservation curtain 6 is arranged in the second air duct 41, and is in a rolled-up state during normal use of the display cabinet. The heat preservation curtain 6 includes two rotatable driving wheels 62 and a passive wheel 63 installed between the top air duct partition 53, and a curtain body 61 wound around the driving wheel 62 and the passive wheel 63. The driving wheel 62 is in a cylindrical shape, and a protrusion 615 is arranged at one end of the curtain body 61. A groove 621 matching the protrusion 615 of the curtain body 61 is arranged in the driving wheel 62. The protrusion 615 is engaged in the groove 621 of the driving wheel 62 and is fixedly connected to the driving wheel 62. The other end of the curtain body 61 hangs freely at the air curtain outlet, and a weight 64 is arranged at the hanging end of the curtain body 61, and the curtain body 61 is pulled to lower the curtain body 61. A stepper motor (not shown) is coaxially arranged on one side of the driving wheel 62. The driving wheel 62 is fixedly connected to the output shaft of the stepper motor. When powered on, the output shaft of the stepper motor is locked to lock the position of the thermal insulation curtain 6. A backup power supply and an automatic switching switch are arranged in the cabinet 1. When the main power supply is cut off, the automatic switching switch automatically switches the power line to the backup power supply. The stepper motor is connected to the backup power supply. At the same time, the stepper motor drives the driving wheel 62 to rotate and control the descending speed of the thermal insulation curtain 6. The thermal insulation curtain 6 is gradually lowered under the traction of the weight 64 and covers the inner side of the glass of the cabinet door 2 to keep the items in the cabinet warm and slow down the melting rate of the items placed in the display cabinet. When the cabinet 1 is powered on, the output shaft of the stepper motor rotates in the opposite direction to roll up the curtain body 61.

[0047] The curtain body 61 is made of a composite of multiple layers of materials, including a sunscreen layer 611, a heat preservation layer 612, a cold storage layer 613 and a base layer 614, which are arranged in sequence from the outside to the inside. The sunscreen layer 611 is arranged on the side close to the cabinet door 2, and is made of aluminum foil to reflect sunlight and reduce the absorption of heat by the curtain body 61. The heat preservation layer 612 is arranged on the inner side of the sunscreen layer 611, and is made of heat preservation cotton, which has a low thermal conductivity and is used to insulate the items in the cabinet. The cold storage layer 613 is arranged on the inner side of the heat preservation layer 612, and a flexible cold storage material is arranged in the cold storage layer 613. When the cabinet 1 is powered off, the cold storage layer 613 keeps the curtain body 61 at a relatively low temperature, prolongs the storage time of the objects stored in the cabinet, and keeps the objects in the cabinet warm. The cold storage material is a composite gel phase change material with a relatively high phase change latent heat, and a gel-like cold storage agent with a suitable viscosity. It is flexible in both the rolled-up state and the use state of the heat preservation curtain 61, and is stably distributed in the heat preservation curtain 61. The base layer 614 is arranged on the side of the curtain body 61 close to the inner chamber of the cabinet and is made of low-temperature resistant PVC material to provide structural strength for the curtain body 61 .

[0048] On one side of the thermal insulation curtain 6, a tubular air duct 7 is provided to connect the first air duct 31 and the second air duct 41. The tubular air duct 7 is provided in the thermal insulation layer 612 of the cabinet 1. Part of the low-temperature air is transported to the second air duct 41 through the tubular air duct 7. The cold storage layer 613 stores the cold air transported by the tubular air duct under normal refrigeration of the display cabinet, so that the thermal insulation curtain 6 is always maintained at a relatively low temperature. When the thermal insulation curtain 6 is lowered after the display cabinet is powered off, the sunscreen layer 611 and the thermal insulation layer 612 block the heat loss in the cabinet, and the phase change latent heat stored in the cold storage layer 613 further maintains the temperature stability in the display cabinet, prolongs the thermal insulation time of the thermal insulation curtain 6, enhances the thermal insulation effect of the display cabinet, and significantly prolongs the time required for the items in the cabinet to melt.

[0049] The air duct inlet 71 of the tubular air duct 7 is arranged at the air outlet side of the first evaporator 32, specifically at the air outlet of the first air duct 31, and the air duct outlet 72 of the tubular air duct 7 is arranged between the driving wheel 62 and the driven wheel 63. A guide cover 74 is arranged at the air duct inlet 71, and a small amount of low-temperature air enters the tubular air duct 7 from the guide cover 74. A plurality of guide plates 73 are arranged in the tubular air duct 7, so that a small amount of low-temperature air can only pass in one direction, and cool the thermal insulation curtain 6 installed in the second air duct 41. After that, the low-temperature air flows out from the air outlet of the second air duct 41 and flows into the storage cavity, and returns to the first air duct 31 under the attraction of the first fan 33.

[0050] An alarm device is also provided in the cabinet 1, and the alarm device is connected to the main power supply and the backup power supply. When the cabinet door 2 is opened for too long, the alarm device alarms and reminds the merchant that the cabinet door 2 of the display cabinet is not closed, so as to avoid the display cabinet being opened for a long time and causing the goods in the cabinet 1 to melt; when the display cabinet is powered off, the alarm device sends an alarm to remind the merchant to take the goods away in time to avoid losses caused by melting of the goods.

[0051] The operating states of the first air duct assembly and the second air duct assembly are adjusted according to the detection result of the cabinet door 2 detection sensor. When the cabinet door 2 is in a closed state, the first solenoid valve 95 is opened, the second solenoid valve 96 is closed, the first evaporator 32 and the first fan 33 work normally, the first air duct assembly cools and maintains the temperature in the display cabinet within a certain temperature range, the second evaporator 42 and the second fan 43 stop working, the cabinet body 1 is in a normal refrigeration cycle state, and at the same time the tubular air duct 7 will transport part of the cold air to the thermal insulation curtain 6 to maintain the thermal insulation curtain 6 at a lower temperature.

[0052] When the cabinet door 2 is opened, the cabinet door 2 detection sensor detects the opening state of the cabinet door 2 and records the cabinet door 2 opening time t. A preset time T is set in the control system. The preset time T is the upper limit value of normal door opening. When the door opening time is too long, greater than the preset time T, the temperature inside the cabinet cannot be maintained by the air curtain alone. The temperature inside the cabinet will rise and cause the items stored in the cabinet body 1 to melt. Therefore, different working states are set according to the door opening time.

[0053] When the door opening time t is less than the preset time T, that is, the door is opened normally to take or put items, the second solenoid valve 96 is opened, the first solenoid valve 95 is closed, the second evaporator 42 and the second fan 43 are working, and the second air duct assembly creates an air curtain to reduce the heat exchange and air exchange inside and outside the cabinet 1, thereby reducing the loss of cold air. The first evaporator 32 and the first fan 33 stop working, and the air curtain reduces the heat exchange and air exchange inside and outside the cabinet 1, thereby effectively improving the refrigeration efficiency and saving energy.

[0054] When the door opening time t>preset time T, the door opening time is too long. If the door is not closed in time, the temperature will easily rise and the items placed in the cabinet 1 will melt. The first solenoid valve 95 and the second solenoid valve 96 are both opened, the first evaporator 32, the first fan 33, the second evaporator 42, and the second fan 43 are all in working state, the first air duct component is refrigerating, the first solenoid valve 95 adjusts the coolant flow according to the temperature sensor in the cabinet 1, and adjusts the refrigeration temperature to ensure that the temperature in the cabinet is not higher than the melting temperature. At the same time, the second air duct component creates an air curtain to reduce the heat exchange and air exchange inside and outside the cabinet 1, reduce the loss of cold air, and the alarm device sends an alarm to remind the merchant that the cabinet door 2 is not closed.

[0055] When the display cabinet loses power, the backup power supply is switched and started, the stepper motor is started, the stepper motor drives the driving wheel 62 to rotate, and the thermal insulation curtain 6 is lowered under the traction of the weight 64 to cover the inside of the cabinet door 2. At the same time, the alarm device is started to remind the merchant to take the goods away in time to avoid losses caused by melting of the goods.

[0056] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A frozen display cabinet, characterized in that: include: A cabinet (1), wherein an inner container is arranged in the cabinet (1) for placing articles, and an opening is arranged on one side of the cabinet (1); A cabinet door (2), the cabinet door (2) being arranged at the opening, and the cabinet door (2) being used to close or open the opening; A first air duct component, the first air duct component produces low-temperature air for cooling the cabinet (1), comprising a first air duct (31), a first fan (33) and a first evaporator (32), wherein the first fan (33) and the first evaporator (32) are installed in the first air duct (31); A second air duct assembly, the second air duct assembly produces an air curtain to separate the air inside and outside the cabinet (1), comprising a second air duct (41), a second fan (43) and a second evaporator (42), wherein the second fan (43) and the second evaporator (42) are installed in the second air duct (41); A heat-insulating curtain (6) is arranged in the second air duct (41) and can be shielded on the inner side of the cabinet door (2) when the power is off, thereby slowing down the melting rate of items placed in the cabinet body (1).

2. The refrigerated display cabinet according to claim 1, characterized in that: The thermal insulation curtain (6) comprises two rotatable driving wheels (62) and a passive wheel (63) installed in the second air duct (41), and a curtain body (61) wound around the driving wheel (62) and the passive wheel (63); a stepping motor capable of driving the driving wheel (62) to rotate is coaxially arranged on one side of the driving wheel (62); one end of the curtain body (61) is connected to the driving wheel (62), and the other end of the curtain body (61) is freely hanging down; a weight (64) is arranged at the hanging end of the curtain body (61).

3. The refrigerated display cabinet according to claim 2, characterized in that: The cabinet (1) is provided with a backup power supply that can be switched when power is off, and the stepper motor is connected to the backup power supply. When the cabinet (1) is powered on, the stepper motor rolls up the thermal insulation curtain (6), and when power is off, the stepper motor starts to lower the thermal insulation curtain (6).

4. The refrigerated display cabinet according to claim 1, characterized in that: The cabinet (1) is provided with an air duct partition (5) installed in the inner shell of the cabinet (1); the air duct partition (5) comprises a bottom air duct partition (51), a rear air duct partition (52), a top air duct partition (53) and a front air duct partition (54) which are connected in sequence; the first air duct (31) and the second air duct (41) are independently arranged, respectively arranged on both sides of the air duct partition (5); and the low-temperature air of the first air duct (31) and the wind curtain of the second air duct (41) have opposite wind directions.

5. The refrigerated display cabinet according to claim 4, characterized in that: A fan fixing plate (34) is installed in the inner tank flush with the lower end of the front air duct partition (54); the fan fixing plate (34), the air duct partition (5) and the inner tank enclose a first air duct (31) on the upper side of the inner tank; a first fan (33) and a first evaporator (32) are installed on the fan fixing plate (34); a through hole is provided at the front of the fan fixing plate (34); the first fan (33) is installed on the through hole and is the air inlet of the first air duct (31); a gap is provided between the fan fixing plate (34) and the rear air duct partition (52); the gap is the air outlet of the first air duct (31).

6. The refrigerated display cabinet according to claim 4, characterized in that: The air duct partition (5) and the inner shell of the cabinet (1) form a second air duct (41); the lower end of the front air duct partition (54) is the air outlet of the second air duct (41); the front end of the bottom air duct partition (51) is the air inlet of the second air duct (41); the second fan (43) is arranged at the corner of the second air duct (41) and is installed between the rear air duct partition (52) and the top air duct partition (53); and the second evaporator (42) is fixedly installed on the back plate of the inner shell.

7. The refrigerated display cabinet according to claim 1, characterized in that: The curtain body (61) is made of a multi-layer composite material, including a sun protection layer (611), a heat preservation layer (612), a cold storage layer (613) and a base layer (614) which are arranged in sequence from the outside to the inside. The sun protection layer (611) is arranged on a side close to the cabinet door (2) and is made of aluminum foil. The heat preservation layer (612) is arranged on the inner side of the sun protection layer (611) and is made of heat preservation cotton. The cold storage layer (613) is arranged on the inner side of the heat preservation layer (612). A flexible cold storage material is arranged in the cold storage layer (613). The base layer (614) is arranged on a side of the curtain body (61) close to the inner chamber of the cabinet and is made of low-temperature resistant PVC material.

8. The refrigerated display cabinet according to claim 2, characterized in that: A tubular air duct (7) is provided on one side of the thermal insulation curtain (6) and is connected in one direction to the first air duct (31) and the second air duct (41); an air duct inlet (71) of the tubular air duct (7) is provided at the air outlet end of the first evaporator (32); an air duct outlet (72) of the tubular air duct (7) is provided between the driving wheel (62) and the driven wheel (63); part of the low-temperature air is transported from the first air duct (31) to the second air duct (41) via the tubular air duct (7), so that the thermal insulation curtain (6) is maintained at a low temperature.

9. The refrigerated display cabinet according to claim 8, characterized in that: The cabinet door (2) is provided with a cabinet door (2) detection sensor for acquiring the opening state and opening time of the cabinet door (2), and the operating states of the first air duct component and the second air duct component are adjusted according to the detection result of the cabinet door (2) detection sensor.

10. The refrigerated display cabinet according to claim 1, characterized in that: It also includes a compressor (91), a refrigerant storage device (92), a drying filter (93), and a condenser (94) connected in sequence, wherein the condenser (94) is connected in parallel with a first low-pressure circuit and a second low-pressure circuit, wherein the first low-pressure circuit includes a first solenoid valve (95), a first throttling device (97), a first evaporator (32), and a one-way valve, and the second low-pressure circuit includes a second solenoid valve (96), a second throttling device (98), a second evaporator (42), and a second one-way valve (910).

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