A refrigerated display cabinet

Abstract

The application provides a refrigeration display cabinet, comprising: a cabinet body, an inner container is arranged in the cabinet body for placing articles, and an opening is arranged on one side of the cabinet body; a cabinet door is arranged at the opening and is used for closing or opening the opening; a first air duct assembly is used for producing low-temperature air for refrigeration in the cabinet body and comprises a first air duct, a first fan and a first evaporator, the first fan and the first evaporator are installed in the first air duct; a second air duct assembly is used for producing an air curtain to separate the air inside and outside the cabinet body and 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; and a 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 the articles placed in the cabinet body is slowed down.

Description

Technical Field

[0001] This invention relates to the field of display cabinet technology, and provides a refrigerated display cabinet. Background Technology

[0002] Most existing refrigerated display cases use frost-free air-cooling technology. The airflow inside the case is drawn in by a fan, and the air flows into the case through the evaporator. When the door is opened, the evaporator fan stops to minimize the impact on the cold air inside the case. This causes several problems: First, when the ambient temperature is high, the evaporator fan stops, and the temperature inside the case rises rapidly, requiring time to reach the storage temperature. If the door is opened for a long time or frequently, the temperature inside the case rises even more rapidly, and the delayed temperature rise can easily cause goods to thaw. Second, when the ambient humidity is high, the high-humidity air entering the case will exacerbate frost formation on the evaporator. Frost on the evaporator reduces cooling capacity and further hinders the cooling of the inside of the case.

[0003] Currently, smart ice cream vending machines have weak temperature control capabilities, mainly because their structure and the way the ice cream is arranged obstruct the airflow, hindering air circulation and preventing the internal temperature from dropping. Frequent opening of the door causes the temperature to rise to a certain level, leading to melting of the ice cream and affecting customer use. Furthermore, the poor insulation of the display cases during power outages causes the goods inside to melt, resulting in significant losses for merchants. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a frozen display case, comprising:

[0005] The cabinet has an inner liner for storing items and an opening on one side.

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

[0007] The first air duct assembly generates low-temperature air to cool the cabinet, including 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] The second air duct assembly, which creates an air curtain to isolate the air inside and outside the cabinet, includes a second air duct, a second fan and a second evaporator, with the second fan and the second evaporator installed in the second air duct;

[0009] The heat-insulating curtain is installed in the second air duct. When the power is off, it can cover the inside of the cabinet door to slow down the melting rate of items placed inside the cabinet.

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

[0011] Specifically, the cabinet is equipped with a backup power supply that can be switched during power failure. The stepper motor is connected to the backup power supply. When the cabinet is powered on, the stepper motor causes the insulation curtain to roll up. When the power is off, the stepper motor starts to lower the insulation curtain.

[0012] Specifically, the cabinet is equipped with an air duct partition installed in the inner liner of the cabinet. 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. The first air duct and the second air duct are independently set and are respectively set on both sides of the air duct partition. The low-temperature air in the first air duct has the opposite airflow direction to the air curtain in the second air duct.

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

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

[0015] Specifically, the curtain is made of a multi-layer composite material, including a sun-protective layer, a heat-insulating layer, a cold-storage layer, and a base layer arranged sequentially from the outside to the inside. The sun-protective layer is located on the side near the cabinet door and is made of aluminum foil. The heat-insulating layer is located inside the sun-protective layer and is made of heat-insulating cotton. The cold-storage layer is located inside the heat-insulating layer and contains flexible cold-storage material. The base layer is located on the side of the curtain near the inner cavity of the cabinet and is made of low-temperature resistant PVC material.

[0016] Specifically, on one side of the heat preservation curtain, there is a tubular air duct that connects the first air duct and the second air duct in one direction. The air inlet of the tubular air duct is located at the air outlet of the first evaporator, and the air outlet of the tubular air duct is located between the driving wheel and the driven wheel. Some low-temperature air is transported from the first air duct to the second air duct through the tubular air duct, so that the heat preservation curtain is maintained at a low temperature.

[0017] Specifically, a cabinet door detection sensor is installed at the cabinet door to acquire the opening status and opening time of the cabinet door, and the operating status of the first air duct assembly and the second air duct assembly is adjusted according to the detection results of the cabinet door detection sensor.

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

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention adds an air curtain structure to the traditional refrigerated display case. When the cabinet door is opened, the air curtain is activated to reduce heat and air exchange between the inside and outside of the cabinet, which can effectively improve refrigeration efficiency and save energy. When the humidity of the outside air is high, it can also reduce the entry of high humidity gas into the cabinet, and prevent high humidity air from causing the evaporator to frost and reduce the refrigeration capacity.

[0021] 2. This invention designs a heat-insulating curtain, which is placed in the second air duct. When there is a power outage, the heat-insulating curtain can be lowered and covered inside the cabinet door to keep the items inside the display cabinet warm, slow down the melting rate of the items placed in the display cabinet, and reduce the loss of goods.

[0022] 3. The present invention adopts a dual low-pressure circuit design, with the first solenoid valve and the second solenoid valve controlling the coolant flow and the working status of the evaporator respectively, resulting in strong control stability. Attached Figure Description

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

[0024] Figure 2 This 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 dual-circulation cooling air curtain of the present invention;

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

[0028] Figure 6 This is a schematic diagram of the cooling cycle of the heat-insulating curtain of the present invention;

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

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

[0031] Figure 9 This is a schematic diagram of the tubular air duct structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the refrigeration principle of the present invention;

[0033] Figure 11 This is a flowchart of a control method according to the present invention.

[0034] Attached reference numerals: 1. Cabinet body; 2. Cabinet door; 31. First air duct; 32. First evaporator; 33. First fan; 34. Fan mounting 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. Insulation curtain; 61. Curtain body; 611. Sun protection layer; 612. Insulation layer; 613. Cold storage layer; 614. Base layer; 615. Protrusion; 62. Drive 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. Dryer filter; 94. Condenser; 95. First solenoid valve; 96. Second solenoid valve; 97. First throttling device; 98. Second throttling device; 99. First check valve; 910. Second check valve. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0036] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] A frozen display case includes a cabinet body 1 and a cabinet door 2. The cabinet body 1 has an inner liner for storing items, such as ice cream and other products requiring freezing. An opening is provided on one side of the cabinet body 1, and the cabinet door 2 is movably positioned at the opening for closing or opening it. The cabinet door 2 is a glass door, facilitating customer selection of items inside. The cabinet door 2 can be hinged to the cabinet body 1 or slidably connected to it. Multiple shelves 8, which are mesh shelves, are provided inside the cabinet body 1. Items are placed on the shelves 8, and cold air can circulate through the gaps in the shelves 8.

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

[0039] A cabinet door 2 detection sensor is installed at cabinet door 2. This sensor acquires the opening and closing signals of cabinet door 2, determining its open state and opening time. Timing begins when the sensor detects that cabinet door 2 is open. This sensor can be a magnetic switch, configured to be compatible with cabinet door 2. The sensor detects the open state and opening time of cabinet door 2 and adjusts the operating status of the first and second air duct components accordingly.

[0040] An air duct partition 5 is provided inside the cabinet 1. The first air duct 31 and the second air duct 41 are independently provided and are respectively located on both sides of the air duct partition 5. 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. 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 of the top of the inner liner of the cabinet 1.

[0041] A fan mounting plate 34 is installed flush with the lower end of the front air duct partition 54 at the top of the inner liner of cabinet 1. The fan mounting plate 34, air duct partition 5, and inner liner together form a first air duct 31 on the upper side of the inner liner. A first fan 33 and a first evaporator 32 are disposed in the first air duct 31 and mounted on the fan mounting plate 34. A through hole is provided at the front position of the fan mounting plate 34, and the first fan 33 is mounted on the through hole, serving as 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 mounting plate 34. The first evaporator 32 is a finned evaporator, used for cooling inside cabinet 1 and maintaining the temperature inside cabinet 1 at no lower than the melting temperature of the items inside. There is a gap between the fan mounting plate 34 and the rear air duct partition 52, which serves as the air outlet of the first air duct 31. The first fan 33 draws air into the first air duct 31, where it passes through the first evaporator 32 to obtain low-temperature air. This low-temperature air flows into the storage cavity through the gap, flows downward under gravity, and passes through the shelf 8, cooling the storage cavity of the display case and maintaining the items inside the cabinet 1 at a low temperature. After circulating within the cabinet 1, the warmed low-temperature air is drawn back into the first air duct 31 by the first fan 33, causing air circulation within the cavity and freezing the items placed inside.

[0042] The air duct partition 5 and the inner liner of the cabinet 1 form a second air duct 41. 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 liner. It is a finned evaporator that lowers the air curtain temperature for air curtain cooling. The second fan 43 is arranged at the corner of the second air duct 41, between the rear air duct partition 52 and the top air duct partition 53. The second fan 43 is preferably a cross-flow fan, which is small in size and has a uniform air volume. The lower end of the front air duct baffle 54 is the air outlet of the second air duct 41, and the front end of the bottom air duct baffle 51 is the air inlet of the second air duct 41. Under the attraction of the second fan 43, air is drawn into the second air duct 41 from the front end of the bottom air duct baffle 51. After being cooled by the second evaporator 42 and accelerated by the second fan 43, a uniform air curtain is formed. It is sprayed vertically downward from the lower end of the front air duct baffle 54 and drawn into the second air duct 41 through the air inlet of the second air duct 41 located below the air outlet of the second air duct 41, thus realizing the circulation of the air curtain.

[0043] When cabinet door 2 is opened, the second fan 43 starts and creates an air curtain. This air curtain acts as the second door of the refrigerated display case, reducing heat and air exchange between the inside and outside of cabinet 1 when the door is open. This effectively improves refrigeration efficiency and saves energy. When the outside air humidity is high, it also reduces the amount of humid air entering cabinet 1, preventing frost buildup on the evaporator and thus reducing refrigeration capacity.

[0044] The refrigeration system of this display case includes a high-pressure side and a low-pressure side. The high-pressure side includes a compressor 91, a refrigerant storage device 92, a dryer filter 93, and a condenser 94. The low-pressure side includes a first low-pressure circuit for cooling the interior of the cabinet 1 and a second low-pressure circuit for air curtain cooling. The first and second low-pressure circuits are connected 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 one-way 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 one-way valve 910. A temperature sensor is installed inside the cabinet 1. The first solenoid valve 95 and the second solenoid valve 96 can adjust and control the refrigerant flow rate according to the temperature inside the cabinet 1, control the cooling capacity of the first evaporator 32 and the second evaporator 42, and control the operating status of the first evaporator 32 and the second evaporator 42 based on the door opening / closing signal obtained by the door 2 detection sensor. This cooling system is designed with dual low-pressure circuits, each regulated and controlled by a solenoid valve, resulting in strong control stability.

[0045] During use, the sealing of one side of the display case door 2 is relatively poor. To prevent the temperature inside the display case 1 from rising due to heat exchange with the outside environment and sunlight after a power outage, which could cause the items to melt and result in losses for the merchant, an insulation curtain 6 is installed on one side of the display case door 2. During a power outage, the insulation curtain 6 can be lowered and placed inside the door 2 to insulate the items inside the display case, slowing down the melting rate and reducing damage to the goods.

[0046] The heat-insulating curtain 6 is installed in the second air duct 41 and is rolled up during normal use of the display case. The heat-insulating curtain 6 includes two rotatable drive wheels 62 and driven wheels 63 installed between the top air duct partitions 53, and a curtain body 61 wound around the drive wheels 62 and driven wheels 63. The drive wheels 62 are cylindrical. One end of the curtain body 61 has a protrusion 615. A groove 621 matching the protrusion 615 is provided in the drive wheel 62, and the protrusion 615 engages in the groove 621 of the drive wheel 62, thus being fixedly connected to the drive wheel 62. The other end of the curtain body 61 hangs freely at the air curtain outlet. A weight 64 is placed at the hanging end of the curtain body 61 to pull the curtain body 61 down. A stepper motor (not shown in the figure) is coaxially mounted on one side of the drive wheel 62. The drive 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, securing the position of the insulation curtain 6. A backup power supply and an automatic switch are installed inside the cabinet 1. When the main power supply fails, the automatic switch automatically switches the power line to the backup power supply. The stepper motor is connected to the backup power supply and simultaneously drives the drive wheel 62 to rotate, controlling the descent speed of the insulation curtain 6. Under the traction of the weight 64, the insulation curtain 6 gradually descends, covering the inside of the glass door 2, insulating the items inside the cabinet and slowing down the melting rate of the items placed in the display case. When the power to the cabinet 1 is restored, the output shaft of the stepper motor rotates in the opposite direction to retract the curtain 61.

[0047] The curtain 61 is made of a multi-layer composite material, including a sun-protective layer 611, a heat-insulating layer 612, a cold-storage layer 613, and a base layer 614 arranged sequentially from the outside to the inside. The sun-protective layer 611 is located near the cabinet door 2 and is made of aluminum foil to reflect sunlight and reduce the absorption of heat by the curtain 61. The heat-insulating layer 612 is located inside the sun-protective layer 611 and is made of heat-insulating cotton, which has a low thermal conductivity and provides heat insulation for the items inside the cabinet. The cold-storage layer 613 is located inside the heat-insulating layer 612 and contains flexible cold-storage material. When the cabinet 1 is powered off, the cold-storage layer 613 keeps the curtain 61 at a lower temperature, extending the storage time of the items stored inside the cabinet and providing heat insulation for the items inside the cabinet. The cold-storage material is a composite gel phase change material with a high latent heat of phase change and a gel-like cold-storage agent with a suitable viscosity. It is flexible in both the rolled-up and used states of the heat-insulating curtain 6 and is stably distributed within the heat-insulating curtain 6. The base layer 614 is located on the side of the curtain 61 near the inner cavity of the cabinet and is made of low-temperature resistant PVC material to provide structural strength for the curtain 61.

[0048] On one side of the heat-insulating curtain 6, a tubular air duct 7 is provided, connecting the first air duct 31 and the second air duct 41. The tubular air duct 7 is installed in the heat-insulating layer 612 of the cabinet 1. Some 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 cooling of the display cabinet, so that the heat-insulating curtain 6 is always maintained at a low temperature. When the display cabinet is powered off and the heat-insulating curtain 6 is lowered, the sun protection layer 611 and the heat-insulating layer 612 prevent heat loss from the cabinet. The latent heat of phase change stored in the cold storage layer 613 further maintains the temperature stability inside the display cabinet, prolongs the heat-insulating time of the heat-insulating curtain 6, enhances the heat-insulating effect of the display cabinet, and significantly extends the time required for the items inside the cabinet to melt.

[0049] The air inlet 71 of the tubular air duct 7 is located on the air outlet side of the first evaporator 32, specifically at the air outlet of the first air duct 31. The air outlet 72 of the tubular air duct 7 is located between the driving wheel 62 and the driven wheel 63. A guide hood 74 is provided at the air inlet 71. A small amount of low-temperature air enters the tubular air duct 7 through the guide hood 74. Multiple guide plates 73 are provided inside the tubular air duct 7, allowing the small amount of low-temperature air to pass through in only one direction, cooling the insulation curtain 6 installed in the second air duct 41. Afterward, the low-temperature air flows out from the air outlet of the second air duct 41 and into the storage cavity, returning to the first air duct 31 under the suction of the first fan 33.

[0050] An alarm device is also installed inside cabinet 1. The alarm device is connected to the main power supply and the backup power supply. When cabinet door 2 is open for too long, the alarm device will sound an alarm and remind the merchant that cabinet door 2 is not closed, so as to prevent the goods inside cabinet 1 from melting due to prolonged opening of the display cabinet. When the display cabinet loses power, the alarm device will sound an alarm to remind the merchant to take the goods away in time to avoid losses caused by melting.

[0051] The operating status of the first air duct assembly and the second air duct assembly is adjusted according to the detection results of the detection sensor of the cabinet door 2. When the cabinet door 2 is closed, the first solenoid valve 95 is opened and 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 displays the temperature inside the cabinet within a certain temperature range. The second evaporator 42 and the second fan 43 stop working. The cabinet 1 is in a normal cooling cycle state. At the same time, the tubular air duct 7 will deliver some of the cold energy to the insulation curtain 6, so that the insulation curtain 6 is maintained at a lower temperature.

[0052] When cabinet door 2 is opened, the cabinet door 2 detection sensor detects the opening status of cabinet door 2 and records the opening time t of cabinet door 2. The control system is set with a preset time T, which is the upper limit of normal door opening. When the opening time is too long, exceeding the preset time T, the air curtain alone cannot maintain the temperature inside the cabinet. The temperature inside the cabinet will rise, causing the items stored in cabinet 1 to melt. Therefore, different working states are set according to the opening time.

[0053] When the door opening time t < preset time T, the door is opened normally for taking out and putting in items. The second solenoid valve 96 is opened and the first solenoid valve 95 is closed. The second evaporator 42 and the second fan 43 work. The second air duct assembly creates an air curtain to reduce heat and air exchange between the inside and outside of the cabinet 1, and reduce the loss of cold air. The first evaporator 32 and the first fan 33 stop working. The air curtain reduces heat and air exchange between the inside and outside of the cabinet 1, which can effectively improve the cooling efficiency and save 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 is likely to 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 condition. The first air duct assembly is cooling. The first solenoid valve 95 adjusts the coolant flow according to the temperature sensor in the cabinet 1 and adjusts the cooling temperature to ensure that the temperature inside the cabinet does not exceed the melting temperature. At the same time, the second air duct assembly creates an air curtain to reduce the heat exchange and air exchange inside and outside the cabinet 1 and reduce the loss of cold air. The alarm device issues an alarm to remind the merchant that the cabinet door 2 of the display cabinet is not closed.

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

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A refrigerated display case, characterized in that, include: Cabinet (1), the cabinet (1) is provided with an inner liner for placing items, and an opening is provided on one side of the cabinet (1). The cabinet (1) is provided with an air duct partition (5) installed in the inner liner of the cabinet (1). 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. The first air duct assembly generates low-temperature air to cool the cabinet (1), including a first air duct (31), a first fan (33) and a first evaporator (32). The first fan (33) and the first evaporator (32) are installed in the first air duct (31). A fan fixing plate (34) is installed in the inner liner 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 surround the upper side of the inner liner to form the first air duct (31). The first fan (33) and the first evaporator (32) are installed on the fan fixing plate (34). The second air duct assembly creates an air curtain to separate the air inside and outside the cabinet (1), including a second air duct (41), a second fan (43) and a second evaporator (42). The second fan (43) and the second evaporator (42) are installed in the second air duct (41). The air duct partition (5) and the inner liner of the cabinet (1) form the second air duct (41). 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). The first air duct (31) and the second air duct (41) are set independently and are respectively set on both sides of the air duct partition (5). The low temperature air in the first air duct (31) is opposite to the wind direction of the air curtain in the second air duct (41). Cabinet door (2), the cabinet door (2) is located at the opening, the cabinet door (2) is used to close or open the opening, the cabinet door (2) is provided with a cabinet door detection sensor to obtain the opening status and opening time of the cabinet door (2), the operating status of the first air duct assembly and the second air duct assembly is adjusted according to the detection result of the cabinet door detection sensor; A heat-insulating curtain (6) is installed in the second air duct (41) and includes a curtain body (61). The curtain body (61) is made of multi-layer composite materials and includes a sun-protective layer (611), a heat-insulating layer (612), a cold-storage layer (613), and a base layer (614) arranged sequentially from the outside to the inside. The sun-protective layer (611) is located on the side near the cabinet door (2). The heat-insulating layer (612) is located inside the sun-protective layer (611). The cold-storage layer (613) is located inside the heat-insulating layer (612). The cold-storage layer (613) contains flexible cold-storage material. The base layer (614) is located on the side of the curtain body (61) near the inner cavity of the cabinet. The heat-insulating curtain (6) includes two rotatable active wheels (62) and passive wheels (63) installed in the second air duct (41), and a curtain body (61) wrapped around the active wheels (62) and passive wheels (63). A stepper motor that can drive the drive wheel (62) to rotate is coaxially arranged on one side of the curtain (62). One end of the curtain (61) is connected to the drive wheel (62), and the other end of the curtain (61) hangs freely. A weight (64) is arranged at the hanging end of the curtain (61). On one side of the heat preservation curtain (6), a tubular air duct (7) that connects the first air duct (31) and the second air duct (41) in one direction is provided. The air inlet (71) of the tubular air duct (7) is located at the air inlet (71) of the tubular air duct (7). The air outlet (72) of the tubular air duct (7) is located at the air outlet of the first evaporator (32). The air outlet (72) of the tubular air duct (7) is located between the active wheel (62) and the passive wheel (63). Some low-temperature air is transported from the first air duct (31) to the second air duct (41) through the tubular air duct (7), so that the heat preservation curtain (6) is kept at a low temperature. When the heat preservation curtain (6) is de-energized, it can cover the inside of the cabinet door (2) to slow down the melting rate of the items placed in the cabinet (1).

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

3. The refrigerated display case according to claim 1, characterized in that: The fan mounting plate (34) has a through hole at the front position. The first fan (33) is installed on the through hole and serves as the air inlet of the first air duct (31). There is a gap between the fan mounting plate (34) and the rear air duct partition (52), which serves as the air outlet of the first air duct (31).

4. The refrigerated display case according to claim 1, characterized in that: The second fan (43) is located 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 evaporator (42) is fixedly installed on the inner liner back plate.

5. The refrigerated display case according to claim 1, characterized in that: The sun protection layer (611) is made of aluminum foil, the cold storage material is a composite gel phase change material, the heat insulation layer (612) is made of heat insulation cotton, and the base layer is made of low-temperature resistant PVC material.

6. The refrigerated display case according to claim 1, characterized in that: It also includes a compressor (91), a refrigerant storage device (92), a dryer filter (93), and a condenser (94) connected in sequence. The condenser (94) 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 (95), a first throttling device (97), a first evaporator (32), and a check valve. 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).

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