Refrigerated display cabinet and method of controlling the same

Abstract

The present disclosure provides a refrigeration display cabinet and a control method thereof. The refrigeration display cabinet comprises a cabinet body, a cabinet opening adjusting device arranged at a cabinet opening, an air duct adjusting device arranged at an air inlet side or an air outlet side of an air duct, and a control unit. The cabinet opening adjusting device comprises a curtain body capable of moving relative to the cabinet opening and having a plurality of curtain segments, and at least two curtain segments are different in the arrangement mode of the light transmission area or the through opening. The air duct adjusting device has a plurality of adjusting positions corresponding to different air supply states. The control unit determines a target curtain segment and a target adjusting position based on a group of operation scene information representing the same operation scene, controls the target curtain segment to correspond to the cabinet opening, and controls the air duct adjusting device to be in the target adjusting position, so that the cabinet opening covering state and the air duct air supply state change in coordination with the operation scene.

Description

Technical Field

[0001] This disclosure relates to the field of refrigeration equipment technology. Background Technology

[0002] The airflow exchange at the cabinet opening and the required air supply to the storage area inside the cabinet will change under different operating conditions.

[0003] Existing refrigerated display cases are difficult to coordinate in adjusting the cover status of the cabinet opening and the air supply status of the air duct based on the same operating scenario, making it difficult to coordinate the airflow exchange at the cabinet opening and the distribution of cooling capacity inside the cabinet in a timely manner. Summary of the Invention

[0004] The refrigerated display case disclosed herein adapts to different operating scenarios through two adjustment devices on the cabinet opening side and the air duct side. The cabinet opening side is equipped with a curtain with multiple solid curtain segments, each forming a covering structure required for product display, partial item retrieval, or cabinet opening insulation. The air duct side is equipped with an adjustment component that can move between multiple positions, changing the air supply connection between the air duct and the storage area at different positions.

[0005] The control unit selects the positions of the curtain section and air duct adjustment device corresponding to the cabinet opening based on a set of operating scenario information corresponding to the same operating scenario, and drives the two adjustment devices to form the cabinet opening coverage state and air duct supply state corresponding to the operating scenario.

[0006] This disclosure also provides a control method for a refrigerated display case. The method acquires a set of operating scenario information characterizing the operation of the refrigerated display case, determines the target curtain section on the cabinet opening side and the target adjustment position on the air duct side based on this information, and controls the cabinet opening adjustment device and the air duct adjustment device to reach the corresponding state.

[0007] This disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the above-described refrigerated display case control method. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the refrigerated display cabinet in this disclosure; Figure 2 This is a schematic diagram illustrating the relationship between operational scenario information and dual-objective collaborative control in this disclosure; Figure 3 This is a schematic diagram of the curtain unfolding and partial layer structure of the cabinet opening adjustment device in this disclosure; Figure 4 This is a schematic diagram of the different adjustment states of the cabinet opening adjustment device in this disclosure; Figure 5 This is a partial structural diagram of the object-receiving segment and the elastic flap in this disclosure; Figure 6This is an exploded structural diagram of the air duct regulating device in this disclosure; Figure 7 This is a schematic diagram of multiple air supply states of the air duct regulating device in this disclosure; Figure 8 This is a schematic diagram of the moving state and adsorption holding state of the movable adjustment plate in this disclosure; Figure 9 This is a flowchart of the refrigerated display case control method in this disclosure; Figure 10 This is a flowchart illustrating the adaptive adjustment of the air duct regulating device according to temperature conditions in this disclosure. Detailed Implementation

[0009] The technical solution is described below with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or corresponding technical objects.

[0010] Multi-layer refrigerated display cases typically have multiple shelves within the storage space, with airflow supplied to each shelf's corresponding storage area via ducts located at the back or top of the cabinet. Due to the higher density of cold air, it tends to sink, potentially leading to significant temperature stratification between storage areas at different heights over time. For example, the temperature in the lower storage area might be 2 to 4 degrees Celsius lower than the upper storage area, with items on the upper shelves being warmer while those on the lower shelves are nearly frozen. Frequent opening of the cabinet door allows hot, humid air from outside to enter the storage space, increasing the instantaneous heat transfer load at the cabinet opening and potentially raising the risk of evaporator frosting. During electric defrosting, the connection between the ducts and the storage space can also allow hot air from the ducts to enter the storage space. Furthermore, when a large number of room-temperature items are added to the cabinet at once, the rate at which each storage area warms up also varies.

[0011] Existing counter opening covering structures and air duct adjustment structures typically operate according to their own control conditions. Ordinary night curtains mainly switch between open and closed states, making it difficult to create different physical covering structures for different needs such as product visibility, partial item retrieval, and store closure insulation. Fixed air ducts or manually adjustable air duct structures cannot respond promptly to changes in door opening and closing, personnel activity, business hours, temperature differences, and defrosting status. Even if adjustment mechanisms are installed on the counter opening side and the air duct side, if the two adjustment mechanisms operate based on unrelated signals, it is possible that the counter opening has switched to the item retrieval or insulation state, while the air duct still maintains an air supply state that is incompatible with the operating scenario.

[0012] To this end, this disclosure provides a cabinet opening adjustment device 200 with multiple curtain segments at the cabinet opening 111, and an air duct adjustment device 300 with multiple adjustment positions at the air duct 130. A control unit 410 identifies the operating scenario based on a set of operating scenario information representing the same operating scenario. The control unit 410 determines a target state combination, including a target curtain segment and a target adjustment position, according to a preset correspondence between operating scenarios and state combinations. It further controls the target curtain segment to correspond with the cabinet opening 111 and controls the air duct adjustment device 300 to be in the target adjustment position, thereby forming a combination of cabinet opening coverage and air duct air supply state that matches the current operating scenario.

[0013] Reference Figure 1 The refrigerated display case 100 includes a cabinet body 110, a door 120, an air duct 130, a refrigeration system 140, a cabinet opening adjustment device 200, an air duct adjustment device 300, a detection unit 400, and a control unit 410. The cabinet body 110 defines a storage space 112 and forms a cabinet opening 111 communicating with the storage space 112 on the user-facing side. The door 120 is located at the cabinet opening 111, used to isolate the storage space 112 from the external environment when closed, and to form a passage for retrieving and placing items when open. The refrigerated display case 100 is suitable for beverage cabinets, beer cabinets, commercial refrigerated display cases, and other refrigeration equipment with multiple storage areas.

[0014] Multiple shelves 113 are installed within the storage space 112, arranged at intervals along the height of the cabinet 110, thereby dividing the storage space 112 into multiple storage areas. Each storage area is used to hold one or more layers of items to be refrigerated. The number, spacing, and support structure of the shelves 113 are determined according to the dimensions of the cabinet 110 and the type of items to be displayed. As an arrangement, the rear of the shelves 113 is close to the air duct 130, and the front of the shelves 113 is close to the cabinet opening 111, so that the cold air delivered by the air duct 130 first enters the corresponding storage area, and then flows along the storage area towards the cabinet opening 111.

[0015] The air duct 130 is installed in the cabinet 110 and is connected to the storage space 112. Figure 1 In this system, the air duct 130 is located at the back of the cabinet 110 and extends along the arrangement direction of the multiple shelves 113. A fixed air duct plate 310 is provided on the side of the air duct 130 facing the storage space 112, and the fixed air duct plate 310 has multiple air outlet windows 311 corresponding to different storage areas. The refrigeration system 140 includes an evaporator 141 and a fan 142. The fan 142 drives the air that has undergone heat exchange in the evaporator 141 to flow along the air duct 130 and enter the corresponding storage area through the air outlet windows 311 that are in a connected state.

[0016] The cabinet opening adjustment device 200 is located at the cabinet opening 111, and the curtain 210 can move relative to the cabinet opening 111. Figure 1 In this design, a cabinet opening adjustment device 200 is installed at the cabinet opening 111, and can be located outside the door 120, so that the curtain 210 can still cover the cabinet opening 111 when the door 120 is open. The cabinet opening adjustment device 200 is adapted to the contour of the cabinet opening 111, and when the curtain 210 moves to different positions, different sections of the curtain 210 correspond to the cabinet opening 111 respectively. The specific installation position of the cabinet opening adjustment device 200 is set according to the movement path of the door 120 and the installation space around the cabinet opening 111, so as to avoid interfering with the opening and closing of the door 120, and to ensure that the curtain 210 forms a predetermined cabinet opening coverage state when the door 120 is open or closed.

[0017] The air duct adjustment device 300 is located on the air outlet side or air inlet side of the air duct 130 and has multiple adjustment positions. Figure 1 In the cabinet 110, the air duct adjustment device 300 is located near the insulation structure at the back. The air duct adjustment device 300 moves vertically, and its movement path is located at the rear of the storage space 112, avoiding the item retrieval and placement channel formed after the door 120 is opened. Different adjustment positions cause different air outlet windows 311 on the fixed air duct plate 310 to be in a connected or blocked state, thereby forming different air supply states such as overall air supply, local air supply, single-layer blocking, and air duct closure.

[0018] The detection unit 400 is used to acquire detection information related to the current operating condition of the refrigerated display case 100. (Refer to...) Figure 2 The detection unit 400 includes at least one of the following: a door switch sensor 401, a human body sensor 402, a temperature detection unit 403, a clock module 404, and an internal cabinet temperature sensor 405. The door switch sensor 401 detects the open or closed state of the door 120; the human body sensor 402 detects whether there is human activity in front of the cabinet 110; the temperature detection unit 403 detects the temperature of the storage areas corresponding to multiple shelves 113; the clock module 404 provides the current time, business hours, and closing time; and the internal cabinet temperature sensor 405 detects the overall temperature within the storage space 112. The detection unit 400 also receives or generates defrosting status information characterizing whether the evaporator 141 is in the defrosting process.

[0019] The door switch sensor 401 is, for example, a magnetic door switch located between the door 120 and the cabinet 110. The human body sensor 402 is, for example, an infrared sensor or microwave radar located on the front side of the cabinet 110. The temperature detection unit 403 includes multiple temperature sensors, with at least one temperature sensor corresponding to each shelf 113. The temperature sensors are located, for example, at the rear of the shelf 113 and near the return air area to detect the temperature related to the air supply and return air status of that storage area. The cabinet internal temperature sensor 405 is used to cooperate with the refrigeration system 140 to perform refrigeration start-stop control, while the temperature detection unit 403 is used to identify temperature differences between different storage areas.

[0020] The control unit 410 is connected to the detection unit 400, the cabinet opening adjustment device 200, the air duct adjustment device 300, and the refrigeration system 140 via signals. The detection unit 400 provides the control unit 410 with at least one of the following: door status information, personnel activity information, time information, floor temperature information, cabinet internal temperature information, and defrosting status information. The control unit 410 identifies the current operating scenario according to preset control logic and queries the correspondence between preset operating scenarios and state combinations to obtain a target state combination that includes both the target curtain section and the target adjustment position. Based on the target state combination, the control unit 410 generates first control information for controlling the cabinet opening adjustment device 200 and second control information for controlling the air duct adjustment device 300.

[0021] The operational scenario information is used to characterize the current operational scenario of the refrigerated display case 100. The operational scenario is not limited to being determined by a single detection quantity. For example, a non-business scenario is determined at least by the relationship between the current time and the preset business period; an unmanned scenario during business hours is determined by the current time and the activity status of personnel within the preset period; an open scenario is determined by the door status information and further subdivided by the opening duration; a localized air supply scenario is determined by the temperature information of multiple storage areas; and a defrosting scenario is determined by the defrosting status information of the refrigeration system 140 or the evaporator 141.

[0022] The same set of operational scenario information refers to the set of information used to identify the same operational scenario in the same scenario judgment. This set of information includes one or more types of information. After identifying the operational scenario, the control unit 410 selects the target state combination from the preset correspondence between operational scenarios and state combinations, rather than independently determining the target curtain section and target adjustment position according to unrelated control conditions. For example, when the door 120 is open, constituting an opening scenario, the target state combination includes the retrieval section 212 and the original air supply position or the closed position; the target state combination corresponding to the unattended scenario during business hours includes the insulation section 213 and the central air supply position.

[0023] The target curtain segment is the curtain segment used to define the cabinet opening coverage state in the target state combination, and the target adjustment position is the position used to define the air duct supply state in the same target state combination. The control unit 410 controls the cabinet opening adjustment device 200 to move the curtain 210 so that the effective coverage area of ​​the target curtain segment coincides with the cabinet opening 111; and controls the air duct adjustment device 300 to move to the target adjustment position so that the vent 321 on the movable adjustment plate 320 and the air outlet window 311 on the fixed air duct plate 310 form a connection relationship defined by the target state combination. Thus, the two target states are determined in the same scene recognition and the same combination selection process.

[0024] Reference Figure 3As a structural implementation, the cabinet opening adjustment device 200 adopts a dual-axis retractable roller blind structure. The curtain body 210 is a flexible composite curtain body, and a display section 211, a retrieval section 212, and a heat preservation section 213 are arranged sequentially along its moving direction. At least two curtain sections differ in at least one of the presence, position, area, or shape of the light-transmitting area, or in at least one of the presence, position, area, or shape of the through opening. Under the action of the cabinet opening drive mechanism 220, the curtain body 210 moves between the drive shaft 221 and the driven shaft 222, causing one of the three curtain sections to unfold and correspond to the cabinet opening 111.

[0025] Display section 211 includes a light-transmitting area 214. The light-transmitting area 214 is used to maintain the visibility of goods within storage space 112 when the curtain 210 covers the cabinet opening 111. The light-transmitting area 214 is formed of a transparent material or a perforated area that reduces obstruction of the view. As a specific example, the transparent or perforated area ratio of display section 211 is not less than 60%; furthermore, a transparent polyvinyl chloride film is provided in the center of display section 211, and the area of ​​the light-transmitting area 214 occupies approximately 70% of the corresponding cabinet opening area. The above area ratio is used to illustrate the specific implementation of display section 211 in balancing cabinet opening obstruction and goods observation, and does not limit the light-transmitting area 214 to a single continuous area.

[0026] The retrieval section 212 has a through-hole retrieval opening 215. The size of the retrieval opening 215 allows a user's arm and the item to be retrieved to pass through, while the curtain outside the retrieval opening 215 maintains coverage of the cabinet opening 111. The retrieval section 212 thus forms an effective passage area smaller than the cabinet opening when fully open. As a specific example, the retrieval opening 215 is located slightly below the center of the retrieval section 212, and its dimensions are 150 mm × 1500 mm. A rectangular transparent PVC film is placed next to the retrieval opening 215, allowing the user to observe the items in the storage space 112 before passing their arm through the retrieval opening 215 or during retrieval. In different cabinet types, the width, height, and position of the retrieval opening 215 are set according to the cabinet opening size and the specifications of the main products.

[0027] The insulation section 213 has no through opening and includes an insulation material layer 217. When the insulation section 213 corresponds to the cabinet opening 111, the curtain continuously covers the cabinet opening 111, and the insulation material layer 217 increases the thermal resistance at the cabinet opening. As a specific example, the thermal conductivity of the material used in the insulation material layer 217 is no higher than 0.03 W / m Kelvin. Further, the insulation material layer 217 includes a 3 mm thick aerogel felt disposed on the back of the insulation section 213, and the thermal conductivity of the aerogel felt is no higher than 0.018 W / m Kelvin. The insulation section 213 is mainly used in non-business, closed-off, or low-frequency observation and retrieval scenarios.

[0028] The curtain 210 is made entirely of a flexible composite fabric. As a specific example, the curtain 210 includes a 0.3 mm thick polyester fiber base fabric, a 0.1 mm thick aluminum foil reflective layer, and a 2 mm to 3 mm thick closed-cell polyethylene foam layer, with a total composite thickness of approximately 2.4 mm to 3.4 mm. The polyester fiber base fabric provides a flexible load-bearing foundation, the aluminum foil reflective layer reduces radiative heat transfer, and the closed-cell polyethylene foam layer provides insulation and shape retention. Transparent materials, access ports 215, and elastic flaps 216 are installed in the corresponding curtain sections 211 and retrieval section 212, while the insulation section 213 has an insulation material layer 217 installed on the composite curtain base.

[0029] The cabinet opening adjustment device 200 includes a cabinet opening drive mechanism 220, a drive shaft 221, and a driven shaft 222. The drive shaft 221 and the driven shaft 222 are respectively located on opposite sides of the cabinet opening 111 along the moving direction of the curtain 210, and their axes are parallel to each other. The cabinet opening drive mechanism 220 includes a stepper motor 223 and a reducer. The stepper motor 223 drives the drive shaft 221 to rotate through the reducer. One end of the curtain 210 is connected to the drive shaft 221, and the other end is connected to the driven shaft 222. When the drive shaft 221 rolls up the curtain 210, the driven shaft 222 releases the curtain 210 synchronously. When the drive shaft 221 rotates in the opposite direction, the torsion spring in the driven shaft 222 rolls up and continuously provides tension, causing the curtain 210 to move along the winding and unwinding path formed by the drive shaft 221, the cabinet opening 111, and the driven shaft 222.

[0030] An encoder is installed at one end of the drive shaft 221 to detect the rotation of the drive shaft 221. The cabinet opening adjustment device 200 is also equipped with an extreme position sensor 224, which may include, for example, Hall sensors respectively installed at both ends of the travel stroke of the curtain 210. When the system is powered on or recalibrated, the control unit 410 drives the curtain 210 to move to an extreme position and uses the corresponding Hall signal as the position zero point; then, the position of the curtain is determined according to the encoder count and the direction of movement of the curtain 210. When the encoder count reaches the target count corresponding to the target curtain segment and is within the allowable error range, the control unit 410 stops the cabinet opening drive mechanism 220.

[0031] The display section 211, the retrieval section 212, and the heat preservation section 213 are arranged continuously along the moving direction of the curtain body 210, and the length of each curtain section in this direction is not less than the effective dimension of the cabinet opening 111 in the corresponding direction. When the target curtain section unfolds and covers the cabinet opening 111, the non-target curtain sections located on both sides of the target curtain section are respectively rolled up or stored in the drive shaft 221 and the driven shaft 222. Figure 3 and Figure 4 The implementation of the drive shaft 221 and driven shaft 222 located on opposite sides of the cabinet opening 111 is shown; without changing the above-mentioned retraction path and target curtain segment positioning relationship, the two shafts can also be arranged along the vertical direction of the cabinet body 110.

[0032] In one position calibration method, the encoder count when a limit position sensor 224 is triggered is taken as the zero point. The encoder counts corresponding to the centers of the display section 211, the retrieval section 212, and the insulation section 213 coinciding with the center of the cabinet opening 111 are recorded as the first target count, the second target count, and the third target count, respectively. The control unit 410 drives the curtain 210 according to the target count, and determines that the target curtain section is in place when the difference between the target count and the actual count does not exceed the preset counting error; another limit position sensor 224 is used for travel end protection and re-zeroing verification.

[0033] Reference Figure 4 When display section 211 is identified as the target curtain section, the cabinet opening drive mechanism 220 moves the curtain 210, aligning the light-transmitting area 214 of display section 211 with the main observation area of ​​cabinet opening 111. When door 120 is closed, users can observe the merchandise through door 120 and the light-transmitting area 214; when door 120 is open but display section 211 is still aligned with cabinet opening 111, display section 211 can also partially obscure cabinet opening 111. This display configuration is suitable for business scenarios with personnel activity, as well as other operational phases where merchandise visibility is required.

[0034] When the retrieval section 212 is identified as the target curtain section, the cabinet opening drive mechanism 220 moves the retrieval opening 215 to a position convenient for the user to retrieve the item. The user extends their arm into the storage space 112 through the retrieval opening 215 and retrieves the item, with the curtain outside the retrieval opening 215 still covering the cabinet opening 111. Therefore, while the door 120 is open, the cabinet opening 111 is not completely exposed, but rather a partial passageway is formed at the retrieval opening 215. The retrieval state is mainly used for the retrieval process after the door 120 is opened.

[0035] When the insulation section 213 is selected as the target curtain section, its continuous curtain surface covers the cabinet opening 111. Since the insulation section 213 does not have a through opening and includes an insulation material layer 217, this configuration is suitable for periods outside of business hours, when the store is closed, or during business hours when there is no human activity for an extended period. The control unit 410 selects the insulation section 213 in the above scenarios and simultaneously selects the corresponding air duct adjustment position, causing the cabinet opening coverage and the air supply area to change together.

[0036] Reference Figure 5An elastic flap 216 is provided at the retrieval opening 215. The elastic flap 216 is connected to the edge area of ​​the retrieval opening 215 and blocks the retrieval opening 215 when no external force is applied. When the user's arm or an object applies external force to the elastic flap 216, the elastic flap 216 undergoes elastic deformation and forms a temporary passage space; when the arm or object is removed from the retrieval opening 215, the external force is released, and the elastic flap 216 returns to its blocked position due to its own elasticity. The elastic flap 216 thus makes the retrieval opening 215 an open channel during the actual retrieval stage.

[0037] The elastic flap 216 is, for example, a silicone cross-shaped diaphragm or an elastic rubber flap. When a silicone cross-shaped diaphragm is used, multiple slits extend outward from the center of the retrieval opening 215, forming multiple elastic flaps between the slits. When an item passes through, the multiple elastic flaps bend in the direction of item movement; after the item leaves, the multiple elastic flaps spring back and re-converge in the center of the retrieval opening 215. The material thickness, slit length, and number of flaps of the elastic flap 216 are set according to the size of the retrieval opening 215 and the specifications of the target product. The elastic flap 216 thus provides a local passage during item retrieval and restores its obstruction of the retrieval opening 215 after item retrieval.

[0038] Reference Figure 6 The air duct 130 includes a fixed air duct plate 310. The fixed air duct plate 310 has multiple air outlet windows 311 arranged along the arrangement direction of the multiple shelves 113. Each shelf 113 corresponds to a storage area with at least two air outlet windows 311, allowing cool air to enter from different locations within that storage area. The shape and size of the multiple air outlet windows 311 are determined based on the air duct cross-section, target airflow, and storage area height. The fixed air duct plate 310 is held on the cabinet 110, forming a fixed boundary of the air duct 130 facing the storage space 112.

[0039] The air duct adjustment device 300 includes a movable adjustment plate 320 and an air duct drive mechanism 330. The movable adjustment plate 320 is disposed adjacent to the fixed air duct plate 310 and moves relative to the fixed air duct plate 310 in the vertical direction. The movable adjustment plate 320 is provided with a plurality of air vents 321, and the plurality of air vents 321 have a distribution position and size that match a plurality of predetermined adjustment positions; Figure 6 The shape and arrangement of the central ventilation openings 321 are for illustrative purposes only. In actual implementation, multiple ventilation openings 321 are arranged in sections or staggered along the moving direction of the movable adjustment plate 320, and form corresponding connected or obstructed combinations with multiple air outlet windows 311 at predetermined adjustment positions. When the movable adjustment plate 320 moves to different adjustment positions, some ventilation openings 321 overlap with some air outlet windows 311, and the non-overlapping air outlet windows 311 are obstructed by the solid plate surface of the movable adjustment plate 320, thereby converting the change in mechanical position into a change in air supply area.

[0040] As a specific example, the movable adjusting plate 320 is a 4 mm thick metal plate. A brush sealing strip 322 is provided on the back of the movable adjusting plate 320, located between the movable adjusting plate 320 and the fixed air duct plate 310. The bristles of the brush sealing strip 322 block the gap between the two plates when they are in contact, and simultaneously undergo elastic deflection when the movable adjusting plate 320 moves. Therefore, it allows the two plates to slide relative to each other while reducing air leakage from the gap between the plates in the air duct. The brush sealing strip 322 is provided along the moving edge of the movable adjusting plate 320 or around the perimeter of the air outlet area.

[0041] The duct drive mechanism 330 includes a lead screw 331, a movable connecting member 332 cooperating with the lead screw 331, and a guide member 333 for defining the direction of movement. A stepper motor drives the lead screw 331 to rotate. The movable connecting member 332 is connected to the movable adjusting plate 320. When the lead screw 331 rotates, the movable connecting member 332 moves along the guide member 333 and drives the movable adjusting plate 320 to change position. As a specific example, lead screws 331 are respectively provided on both sides of the movable adjusting plate 320, and the two lead screws 331 are linked by a synchronous belt. The synchronous belt causes the two lead screws 331 to rotate at corresponding speeds, thereby keeping the two sides of the movable adjusting plate 320 moving synchronously and reducing the possibility of the movable adjusting plate 320 tilting or jamming during movement. In this drive structure, the position repeatability accuracy of the movable adjusting plate 320 can be ±0.5 mm. As an example of driving direction, when the movable adjustment plate 320 moves upward, the stepper motor rotates clockwise and drives the movable adjustment plate 320 to move upward via the lead screw 331 and the movable connector 332.

[0042] The moving distance of the movable adjustment plate 320 corresponds to the arrangement pitch of the vents 321 and the air outlet windows 311. When Δh represents the unit moving distance of the movable adjustment plate 320 between adjacent predetermined adjustment positions, Δh, 2Δh, or 3Δh represent the increment of the movable adjustment plate 320 from its current position across one, two, or three positions, respectively. Different cabinet sizes, the number of air outlet windows, or the window pitch correspond to different actual Δh values; therefore, Δh represents a structurally relevant preset displacement, rather than a fixed length applicable to different refrigerated display cabinets 100.

[0043] Reference Figure 7 When the movable adjustment plate 320 is in the overall air supply position, multiple vents 321 overlap with multiple air outlet windows 311, and the air supply passages corresponding to multiple storage areas are in a connected state. The overall air supply state allows multiple air outlet windows 311 to have different opening degrees, while keeping the air supply passages corresponding to multiple storage areas in a connected state.

[0044] When the movable adjustment panel 320 is in the central air supply position, the air outlet windows 311 corresponding to the two consecutive shelves 113 in the middle are connected to the vents 321, while the air outlet windows 311 corresponding to other storage areas are blocked or partially blocked. This state is suitable for periods of low customer activity during business hours, but where customers may still need to retrieve items, ensuring that the easily accessible central area continues to receive cool air. When the central air supply position is combined with the insulation section 213, the heat exchange channel of the cabinet opening 111 is restricted, while the designated storage area continues to receive air.

[0045] When the movable adjustment panel 320 is in the single-layer local air supply position, the air outlet window 311 corresponding to the storage area with a higher temperature is open, while the air outlet windows 311 corresponding to other storage areas are blocked; or, the effective air outlet area of ​​the storage area is larger than that of other storage areas. The control unit 410 identifies the target area with a higher temperature based on the layer temperature information fed back by multiple temperature sensors, and determines the adjustment position corresponding to the target area as the target adjustment position. Local air supply concentrates more cool air into the area with a higher temperature, thereby reducing the temperature difference between different storage areas.

[0046] When the movable adjustment plate 320 is in the single-layer overcooling protection position, the air outlet window 311 corresponding to the storage area with a lower temperature is blocked by the movable adjustment plate 320, while other storage areas continue to receive airflow. This state does not stop the cooling process of the entire refrigerated display case 100, but rather reduces the amount of cooling received by the lower-temperature areas by changing the local airflow path. The single-layer local airflow and single-layer overcooling protection can be executed alternately according to the layer temperature information to adapt to temperature stratification situations such as higher upper layer temperature and lower lower layer temperature.

[0047] When the movable adjustment panel 320 is in the closed position, its solid surface blocks multiple air outlet windows 311, thus closing the main air supply path between the air duct 130 and the storage space 112. This closed state applies when the door 120 is continuously open and when the evaporator 141 is performing electric defrosting. During the continuous door-opening phase, closing the air duct reduces the airflow path between the air duct 130 and the external environment via the cabinet opening 111; during the defrosting phase, closing the air duct reduces the amount of hot air entering the storage space 112 from the air duct 130.

[0048] The aforementioned overall air supply, central air supply, single-layer local air supply, single-layer subcooling protection, and closed state are formed by the positional change of the same movable adjustment plate 320 relative to the fixed air duct plate 310. The ventilation openings 321 adopt through holes, elongated holes, windows, or partitioned obstruction patterns that are adapted to the predetermined air outlet window combination; for structures using regularly arranged through holes, the number of through holes, hole spacing, or misalignment in different areas are set according to the air supply state corresponding to each predetermined adjustment position. Figure 7Tables (a) to (e) show typical positional relationships between the movable adjusting plate 320 and the fixed air duct plate 310 under the above five states, wherein... Figure 7 (a) shows the overall air supply status. Figure 7 (b) shows the air supply status in the middle section. Figure 7 (c) shows the localized air supply status of a single-story building. Figure 7 (d) shows the single-layer subcooling protection state. Figure 7 (e) shows the closed state. More localized air supply positions can be set according to the number of storage areas. Different air supply states are formed by the mechanical position of the movable adjustment plate 320, facilitating identification of the air supply range through structural position. Figure 7 (a) to (e) are schematic diagrams of parallel structural states and do not represent sequential switching according to the order of the attached drawings.

[0049] Reference Figure 8 An electromagnet 340 is fixedly mounted on the side of the movable adjustment plate 320 facing the fixed air duct plate 310. The fixed air duct plate 310 is formed of a magnetic material that can be attracted by the electromagnet 340, or a magnetic mating part 341 is provided on the fixed air duct plate 310 at a position corresponding to the electromagnet 340. When the movable adjustment plate 320 is ready to move, the control unit 410 controls the electromagnet 340 to be de-energized, so that a moving gap is formed between the electromagnet 340 and the fixed air duct plate 310 or the magnetic mating part 341. The air duct drive mechanism 330 then drives the movable adjustment plate 320 to move along the fixed air duct plate 310.

[0050] After the movable adjustment plate 320 reaches the target adjustment position, the control unit 410 stops the duct drive mechanism 330 and energizes the electromagnet 340. The electromagnet 340 attracts the fixed duct plate 310 or the magnetic mating part 341, causing the movable adjustment plate 320 to move towards the fixed duct plate 310 and press the brush sealing strip 322, forming... Figure 8 The bonding interface is shown in the figure. The moving gap of the electromagnet 340 when it is de-energized is used to reduce driving resistance, and the bonding state when it is energized is used to reduce air leakage between the plates and suppress the displacement of the moving adjustment plate 320 due to airflow pressure.

[0051] To verify the sealing status in the closed position, under the same fan speed and duct inlet conditions, the total airflow on the storage space 112 side was measured when the movable adjustment plate 320 was in the overall air supply position and the closed position, respectively. The ratio of the total airflow in the closed position to the total airflow in the overall air supply position was used as the leakage ratio. If the leakage ratio was not higher than the preset leakage upper limit, the closed state was deemed to meet the sealing requirements. A feeler gauge could also be used to check the local gap between the movable adjustment plate 320 and the fixed duct plate 310.

[0052] The control unit 410 performs fault monitoring on the cabinet opening drive mechanism 220 and the air duct drive mechanism 330. If the position arrival time exceeds a preset time, the difference between the number of drive pulses and the encoder feedback exceeds a preset difference value, two limit position sensors simultaneously output contradictory states, the position deviation of the dual lead screws exceeds the synchronization threshold, or the operating current of the electromagnet 340 is abnormal, the control unit 410 stops the corresponding drive and outputs fault information. When drive conditions are still available, the air duct adjustment device 300 enters the overall air supply position in the non-defrosting state and the closed position in the defrosting state; the cabinet opening adjustment device 200 enters the retrieval section position when the door 120 is open and the display section position when the door 120 is closed; if drive cannot continue, the current position is maintained and restarting is prohibited. After the fault is cleared, the control unit 410 first controls the electromagnet 340 to de-energize, then drives the corresponding device to the limit position to re-zero, completes the position reference calibration, and resumes operation.

[0053] Reference Figure 9 The control method for the refrigerated display case 100 involves the control unit 410 synchronizing the current time via the clock module 404 after the system is powered on, and then controlling the air duct adjustment device 300 to move to a preset reset position. The preset reset position may be, for example, the overall air supply position or an initial position used to establish a position reference. Subsequently, step S910 is executed to obtain the operating scenario information.

[0054] Specifically, the system acquires operational scenario information characterizing the operating scenario. The detection unit 400 provides the control unit 410 with at least one of the following: door status information, personnel activity information, time information, floor temperature information, cabinet internal temperature information, and defrosting status information. The control unit 410 identifies the scenario in which the refrigerated display cabinet 100 is located based on the information acquired within the current control cycle, and re-executes the target state determination when the scenario information changes.

[0055] In step S920, the target curtain segment and the target adjustment position are determined.

[0056] The control unit 410 identifies the operating scenario based on the same set of operating scenario information and determines the target state combination according to the preset correspondence between the operating scenario and the state combination. The target state combination includes the target curtain section acting on the cabinet opening 111 and the target adjustment position acting on the air duct 130. For example, in a non-business scenario, the combination of the insulation section 213 and the top-floor local air supply position corresponds to the combination of the retrieval section 212 and the adjustment position before the door opens when the door is open and the opening duration has not reached the preset time; when the door is open for the preset time, the combination of the retrieval section 212 and the closed position corresponds to the combination of the retrieval section 212 and the closed position.

[0057] In step S930, control the cabinet opening adjustment device and the air duct adjustment device.

[0058] The control unit 410 outputs first control information and second control information. The first control information drives the cabinet opening adjustment device 200 to move the target curtain segment to the position corresponding to the cabinet opening 111; the second control information drives the air duct adjustment device 300 to move the movable adjustment plate 320 to the target adjustment position. After the two devices are in place, the cabinet opening 111 forms a covering structure corresponding to the target curtain segment, and the air duct 130 forms an air supply structure corresponding to the target adjustment position. The control unit 410 also adjusts the set temperature and fan speed, among other cooling parameters, according to the operating scenario. Thus, the two adjustment devices obtain corresponding target states in a single scenario judgment.

[0059] In the control method, t_set represents the set temperature of the refrigerated display cabinet 100 and serves as the temperature reference for stopping the refrigeration system 140; Δt represents the upward offset value of the set temperature when switching operating scenarios; t_average represents the average temperature of multiple storage areas; Δt_high represents the cabinet temperature offset threshold that triggers overall air supply; Δt_part represents the local temperature offset threshold for identifying individual storage areas with excessively high or low temperatures; and Δh represents the unit movement distance of the movable adjustment plate 320 between adjacent predetermined adjustment positions. t_set, Δt, t_average, Δt_high, Δt_part, and Δh are stored in the parameter area accessible to the control unit 410. Specific temperature offset values, judgment thresholds, and movement distances are determined according to the cabinet volume, the number of storage areas, the target temperature range, and the arrangement of the air outlet windows. The following multiple relationships are used to illustrate the control differences between different operating scenarios.

[0060] The control unit 410 sets scene priorities for both the cabinet-side output and the duct-side output. On the duct side, the target adjustment position is determined in the following order: fail-safe, defrost shut-off, continuous door-open shut-off, frequent door-opening recovery, non-business or business unattended air supply, and routine floor temperature adjustment. On the cabinet-side, the target curtain segment is determined in the following order: fail-safe, door open for retrieval, non-business or business unattended insulation, and business with staff displaying information. When a higher-priority scene is triggered, interruptions to lower-priority states that have not yet reached their minimum hold time are permitted.

[0061] When multiple scenario conditions are met simultaneously, the control unit 410 selects the target state combination under the same operating scenario according to the priority of the two outputs. For example, when the door 120 is open during defrosting, the target state combination is the retrieval section 212 and the closed position; when the door 120 is closed during defrosting, the air duct side remains in the closed position, and the cabinet side selects the display section 211 or the insulation section 213 according to the business hours and personnel activity status.

[0062] After the door switch sensor 401 and the human body sensor 402 maintain their states continuously for a preset de-jittering time, the control unit 410 confirms the corresponding state change. Different entry and exit thresholds are used to form hysteresis ranges for temperature conditions. Once the target curtain segment or target adjustment position is in place, it maintains its position for at least a preset minimum holding time. Only when a higher-priority scenario is triggered or a fault occurs will the switch be initiated earlier within the minimum holding time. This reduces sensor jitter and reciprocating motion caused by temperature fluctuations near the threshold.

[0063] During non-business hours, the time information provided by the clock module 404 indicates that the current time is after the closing time or within the preset non-business hours. The control unit 410 identifies the insulation section 213 as the target curtain section, ensuring that the insulation section 213 covers the cabinet opening 111; simultaneously, it identifies the position where the top-floor air outlet window 311 remains connected while blocking other air outlet windows 311 as the target adjustment position. As a specific control example, the control unit 410 adjusts the set temperature to t_set+2Δt, reduces the speed of the fan 142, and controls the movable adjustment plate 320 to move to the preset top-floor local air supply position. Thus, in the non-business scenario, a combination of the insulation section 213, top-floor local air supply, a higher set temperature, and a lower fan speed is formed.

[0064] During business hours, if the human body sensor 402 does not detect any human activity for two consecutive hours, the control unit 410 determines that the current situation is an unmanned business scenario. The control unit 410 identifies the insulation section 213 as the target curtain section, ensuring that the insulation section 213 covers the cabinet opening 111; simultaneously, it controls the movable adjustment plate 320 to the preset central air supply position, connecting the air outlet windows 311 corresponding to the two consecutive central storage areas. In this scenario, the temperature adjustment is set to t_set + Δt. Compared to the non-business scenario, the unmanned business scenario retains air supply to the central area and uses a smaller temperature increase.

[0065] When personnel activity is detected during business hours, or when the continuous period of no personnel has not yet reached the preset time, the control unit 410 identifies the display section 211 as the target curtain section, aligning the light-transmitting area 214 with the cabinet opening 111. The air duct adjustment device 300 determines the target adjustment position based on the layer temperature information. When the temperature of multiple storage areas needs to be restored, the overall air supply position is used; when the temperature of a storage area is relatively high, the corresponding single-layer local air supply position is used; when the temperature of a storage area is relatively low, the corresponding single-layer overcooling protection position is used.

[0066] During the temperature adjustment process, the control unit 410 obtains the temperature sensor outputs corresponding to multiple shelves 113 and determines the target adjustment position according to the order of defrosting status, overall cabinet temperature, and shelf temperature status. When the refrigerated display cabinet 100 is in defrosting status, the control unit 410 determines the closed position as the target adjustment position. When it is not in defrosting status and the cabinet temperature is higher than t_set + Δt_high, the control unit 410 determines the overall air supply position as the target adjustment position, connecting the air outlet windows 311 corresponding to multiple storage areas. When the overall air supply condition is not triggered, if the temperature of a storage area is higher than t_average + Δt_part, the control unit 410 determines the single-layer local air supply position corresponding to that storage area as the target adjustment position; if the temperature of a storage area is lower than t_set - Δt_part, the control unit 410 determines the position that blocks the air outlet window 311 corresponding to that storage area as the target adjustment position. When the temperature inside the cabinet is lower than t_set, the control unit 410 controls the refrigeration system 140 to stop refrigeration; if the stop condition is not met, the control unit 410 continues to acquire the temperature inside the cabinet and the shelf temperature information and update the target adjustment position in subsequent detection cycles. The above judgment threshold is set according to the cabinet structure, the number of storage areas, and the target temperature range.

[0067] After a large number of room-temperature beverages or other items are placed into the storage space 112 at once, the cabinet temperature sensor 405 and temperature detection unit 403 detect an overall temperature rise or a rise in the temperature of multiple compartments. The control unit 410 determines the overall air supply position as the target adjustment position, so that multiple storage areas receive cool air. Since different storage areas near the evaporator 141, the return air area, or the cabinet opening 111 have different temperature rise rates, the control unit 410 continues to monitor the compartment temperature information during the overall air supply phase, and switches to the local air supply or overcooling protection position after some areas have recovered to the predetermined range.

[0068] After door 120 is opened, door switch sensor 401 outputs door opening status information. Control unit 410 identifies retrieval section 212 as the target curtain section and controls retrieval port 215 to move to the position corresponding to cabinet opening 111. Control unit 410 simultaneously controls fan 142 to stop operating, in order to reduce the amount of hot and humid air actively drawn in from outside the cabinet by fan 142 while door 120 is open. The handling method of air duct adjustment device 300 when door 120 is open also depends on the duration of door 120 opening.

[0069] The control unit 410 acquires the opening duration of the door 120 and compares it with a preset duration. If the opening duration does not reach the preset duration, the control unit 410 determines the adjustment position of the air duct adjustment device 300 before the door 120 is opened as the target adjustment position, keeping the movable adjustment plate 320 in its original state. This process is suitable for short-time item retrieval processes, reducing the reciprocating movement of the movable adjustment plate 320 within a short period. As an example of control parameters, the preset duration is 1 minute.

[0070] When the open duration reaches the preset time, the control unit 410 determines the closed position as the target adjustment position. The electromagnet 340 is first de-energized, and the air duct drive mechanism 330 drives the movable adjustment plate 320 to move to the preset closed position, causing the movable adjustment plate 320 to block multiple air outlet windows 311. After the movable adjustment plate 320 is in place, the electromagnet 340 is energized to maintain its attraction. Because the movable adjustment plate 320 is located at the back of the cabinet 110 and close to the insulation structure, its movement path avoids the space where users can access items through the cabinet openings 111.

[0071] After door 120 is closed, control unit 410 re-identifies the operating scenario and selects the target state combination based on current time information, personnel activity information, defrosting status information, cabinet temperature information, and floor temperature information. When the business is open, there is personnel activity, and the cabinet is not in defrosting state, control unit 410 aligns display section 211 with cabinet opening 111 and resumes operation of fan 142. Control unit 410 further counts the number of times the door is opened within a preset statistical period; when the number of openings reaches the preset number, frequent door openings to restore the scenario take priority over regular floor temperature adjustment, and control unit 410 determines the overall air supply position as the target adjustment position.

[0072] After frequent door openings, hot outside air repeatedly enters the storage space 112, potentially causing temperature increases in multiple storage areas. Once the movable adjustment panel 320 returns to its overall airflow position, multiple air outlets 311 simultaneously supply air to the storage space 112. The control unit 410 maintains overall airflow or switches to other adjustment positions based on the temperature recovery within the cabinet and between shelves. The aforementioned statistical time period and number of door openings are scene recognition parameters, set according to the door 120 dimensions, cabinet volume, usage location, and door opening habits.

[0073] When the refrigerated display case 100 enters the defrosting state, the defrosting status information indicates that the electric heating device near the evaporator 141 is in operation. For air duct adjustment output, the defrosting scenario has higher priority than the overall temperature inside the cabinet and the layer temperature adjustment, and the control unit 410 determines the closed position as the target adjustment position. When the door 120 is closed and the business is in operation, the cabinet opening side remains the display section 211; if the door 120 is opened during defrosting, the cabinet opening side switches to the retrieval section 212, while the air duct side remains in the closed position.

[0074] After defrosting, the control unit 410 deactivates the defrosting scenario and sets the overall air supply position as the target adjustment position. After the electromagnet 340 is de-energized, the air duct drive mechanism 330 drives the movable adjustment plate 320 to move, connecting multiple vents 321 with multiple air outlets 311; once the movable adjustment plate 320 is in place, the electromagnet 340 is re-energized. Overall air supply is used to re-establish cold air circulation within the storage space 112 after defrosting, after which the control unit 410 switches to normal air supply control based on the floor temperature information.

[0075] The cabinet opening drive mechanism 220 and the air duct drive mechanism 330 can each be equipped with independent stepper motors. When driven independently, the control unit 410 outputs cabinet opening drive pulses and air duct drive pulses respectively, and the two drive mechanisms complete the movement according to their respective target positions. The start and end times of the two devices are allowed to be different, ultimately forming the target curtain segment and target adjustment position corresponding to the same operating scenario.

[0076] Alternatively, the cabinet opening adjustment device 200 and the air duct adjustment device 300 can be driven by the same motor via a chain or gear transmission mechanism. The shared drive structure sets the corresponding transmission relationship according to the travel distance of the two devices, so that when the motor rotates, the curtain 210 and the movable adjustment plate 320 reach their predetermined positions respectively. In the shared drive mode, the control unit 410 still determines the two target states based on the same operating scenario; the main difference is that the two adjustment devices share a power source.

[0077] Alternatively, the right end of shelf 113 can be installed higher than the left end, and a sliding device can be provided at the bottom of shelf 113 to allow goods located on the right side to move to the left under the action of gravity and the sliding structure. This structure is used to allow goods behind to fill the space on the intended retrieval side after the user retrieves goods from the area near the cabinet opening 111. When this shelf structure is used in conjunction with the cabinet opening adjustment device 200, the retrieval opening 215 is located near the end of the goods filling position to shorten the distance the user's arm needs to reach into the storage space 112.

[0078] Alternatively, the cabinet opening adjustment device 200 can adopt a vertical blade louver. Multiple vertical blades are arranged side by side, and different blades are connected to a horizontal push rod via a micro-link. A stepper motor drives the horizontal push rod to move left and right, thereby causing multiple blades to rotate. Different blade angles and combinations of blades create cabinet opening states corresponding to product display, partial passage, and auxiliary heat preservation. In this alternative structure, the control unit 410 still determines the target state of the cabinet opening side based on the operating scenario information.

[0079] Alternatively, the duct regulating device 300 can employ a flexible roller shutter-type regulating component. This flexible regulating component has multiple ventilation or shielding zones, which are selectively aligned with the air outlet windows 311 on the fixed duct plate 310 via a roller drive. The flexible roller shutter-type regulating component performs the same air supply state switching function as the movable regulating plate 320, and its ventilation zone distribution, guiding, sealing, and position detection structures are configured according to the dimensions of the duct 130.

[0080] When the refrigerated display case 100 is operating normally, the fan 142 drives air through the evaporator 141 to cool it down. The low-temperature air enters the air duct 130 and is delivered to different storage areas through the air outlet 311, which is in a connected state. After exchanging heat with the items on the shelves 113, the air flows to the return air area and returns to the evaporator 141. The movable adjustment plate 320 does not change the refrigeration cycle itself, but rather the distribution path of the cold air from the air duct 130 to the different storage areas. Therefore, the control unit 410 can adjust the amount of cooling received by each layer by changing the position of the movable adjustment plate 320 while the refrigeration system 140 continues to operate.

[0081] Temperature sensors in different storage areas form a layer temperature detection array. The control unit 410 can read the output of each temperature sensor according to the arrangement of the shelves 113, and use the temperature difference between adjacent storage areas, the deviation of a single storage area from the set temperature, and the overall temperature status of multiple storage areas as the basis for layer temperature judgment. If the temperature of the lower storage area remains low while the temperature of the upper area is high, the control unit 410 changes the cooling distribution by reducing the air supply to the lower layer and increasing the air supply to the upper layer. This adjustment can gradually reduce the temperature difference between layers through multiple detection cycles, and the control unit 410 updates the target adjustment position based on the layer temperature information in subsequent detection cycles.

[0082] The three curtain sections of the cabinet opening adjustment device 200 and the multiple positions of the air duct adjustment device 300 together constitute multiple selectable operating state combinations. For the same target curtain section, the control unit 410 can still determine different target adjustment positions according to different scenarios. For example, the insulation section 213 can be combined with the top-floor local air supply position during non-business hours, or with the central air supply position in an unoccupied scenario during business hours; the display section 211 can be combined with the overall air supply position, or with the single-layer local air supply or single-layer overcooling protection position. Therefore, the cabinet opening state and the air duct state are not a fixed one-to-one correspondence, but rather the specific combination is determined by the operating scenario information.

[0083] During the switching process of the curtain 210, the control unit 410 calculates the target rotation amount of the drive shaft 221 based on the predetermined position of the target curtain segment on the curtain 210. The stepper motor 223 outputs torque through the reducer, and the drive shaft 221 pulls the curtain 210 to move. The torsion spring of the driven shaft 222 releases or retracts the curtain 210 synchronously. The encoder continuously feeds back the rotation amount of the drive shaft 221. When approaching the target position, the control unit 410 completes deceleration or stop control, so that the boundary of the target curtain segment is located outside the cabinet opening 111, reducing the functional area of ​​adjacent curtain segments entering the effective range of the cabinet opening 111.

[0084] The curtain 210 employs a continuous connection structure in the boundary area between the display section 211, the retrieval section 212, and the insulation section 213, allowing the entire curtain 210 to be pulled as a whole by the drive shaft 221 and the driven shaft 222. Stable connections are formed between the transparent PVC film and the flexible composite fabric, between the elastic flap 216 and the edge of the retrieval port 215, and between the aerogel felt and the back of the insulation section 213. These connections maintain the relative positions of the different functional areas during repeated opening and closing of the curtain 210, ensuring that the position of the curtain detected by the encoder corresponds to the position of the target curtain segment.

[0085] In the retrieval state, the user retrieves the item by passing their arm or the item through the elastic flap 216 without pushing the entire curtain 210. The elastic flap 216 is fixed to the retrieval opening 215 at its periphery, while its central area can undergo localized deformation, thus keeping the main body of the curtain 210 at the cabinet opening 111. After the user exits, the elastic flap 216 returns to the vicinity of the retrieval opening 215, and the retrieval section 212 continues to cover the cabinet opening 111. Compared to the method of retrieving items by rolling up the entire curtain, this localized deformation process does not require the cabinet opening drive mechanism 220 to repeatedly move with the retrieval operation.

[0086] The process of de-energizing the electromagnet before the movable adjustment plate 320 moves, driving the lead screw 331 during movement, and energizing the electromagnet after it reaches its destination constitutes a position switching process. The control unit 410 first releases the holding force, then outputs a stepping pulse corresponding to the target movement distance; the lead screw 331 rotates synchronously under the action of the timing belt, and the movable connecting piece 332 moves along the guide piece 333, driving the movable adjustment plate 320 to translate; after reaching the target position, the stepper motor stops and the electromagnetic adsorption is restored. This sequence allows the movement function and the adhesion holding function to function at different stages.

[0087] The correspondence between the vent 321 and the air outlet window 311 is determined during the structural design phase according to a predetermined air supply state. Taking multiple shelves 113 corresponding to multiple window groups in sequence as an example, when the movable adjustment plate 320 is in the first position, multiple window groups coincide with the vent 321 respectively; in the second position, the middle window group coincides with the vent 321; in the third position, a target window group coincides with the vent 321; in the fourth position, except for the window group requiring overcooling protection, the other window groups remain connected; in the fifth position, multiple window groups are blocked by the solid plate surface. The control unit 410 drives the movable adjustment plate 320 to the corresponding position to obtain the above-mentioned air supply state.

[0088] In non-business scenarios, the top-floor localized air supply utilizes the downward movement of cold air. After the insulation section 213 covers the cabinet opening 111, air exchange at the opening is restricted, allowing the cold air delivered from the top-floor air outlet 311 to diffuse downwards under the influence of gravity and the fan 142. Simultaneously, the set temperature is increased to t_set+2Δt and the fan 142 speed is reduced to decrease forced air supply during non-business periods. In this scenario, different actions are uniformly issued by the same control unit 410, rather than being independently changed by the curtain, thermostat, and air duct panel.

[0089] Even when the store is unattended during business hours, the two consecutive central storage areas are still ventilated because there is a possibility of renewed human activity and temporary item retrieval. The insulation section 213 reduces heat exchange at the cabinet opening during unattended periods, and the central air supply position maintains a lower temperature in the designated easily accessible areas. When the human body sensor 402 detects human activity again, the control unit 410 aligns the display section 211 with the cabinet opening 111 and repositions the movable adjustment plate 320 based on the latest temperature information, thus transitioning the refrigerated display cabinet 100 from unattended to display mode.

[0090] After the door 120 is opened, the change in the state of the door switch sensor 401 causes the control unit 410 to initiate retrieval control before the temperature inside the cabinet rises significantly. The retrieval section 212 first restricts the effective opening of the cabinet opening 111, the fan 142 stops actively supplying air, and the movable adjustment plate 320 adopts a hold or close strategy depending on the duration of the opening. Thus, the control process addresses both short-term retrieval during the initial opening and continuous opening, reducing the reciprocating movement of the air duct adjustment device 300 caused by short-term opening, and further isolating the air duct 130 when the opening time is longer. By restricting the effective opening of the door 120 during opening and stopping active air supply, the entry of hot and humid air into the storage space 112 can be reduced, alleviating the frosting load on the evaporator 141 and helping to extend the interval between adjacent defrosting processes.

[0091] The number of times the door 120 is opened after it is closed is used to reflect the cumulative external heat load entering the storage space 112 over a period of time. A single door opening may not necessarily trigger overall air supply, but multiple door openings within the preset statistical period will affect multiple areas inside the cabinet. After the number of door openings reaches the preset number, the control unit 410 resets the movable adjustment plate 320 to the overall air supply position, and then determines whether to exit the overall air supply state based on the cabinet temperature and shelf temperature information.

[0092] In the defrosting scenario, the movable regulating plate 320's closing of the air outlet window 311 serves a different purpose than the partial blocking during normal cooling. Localized air supply or overcooling protection is used to redistribute cold air, while defrosting closure alters the hot air path between the air duct 130 and the storage space 112. After defrosting, the movable regulating plate 320 switches from the closed position to the overall air supply position, allowing air recooled by the evaporator 141 to simultaneously enter multiple storage areas, after which localized regulation is restored based on the floor temperature information.

[0093] Reference Figure 10 In step S1010, the control unit 410 acquires defrosting status information, cabinet temperature information, and layer temperature information. In step S1020, it determines whether the refrigerated display cabinet 100 is in defrosting mode. If it is in defrosting mode, step S1030 is executed, controlling the air duct adjustment device to be in the closed position. If it is not in defrosting mode, step S1040 is executed, determining whether the cabinet temperature is higher than t_set+Δt_high. If the cabinet temperature is higher than t_set+Δt_high, step S1050 is executed, controlling the air duct adjustment device 300 to be in the overall air supply position. Otherwise, step S1060 is executed, determining whether there is a storage area with a temperature higher than t_average+Δt_part. If there is a storage area with a high temperature, step S1070 is executed, controlling the corresponding storage area to be in a single-layer local air supply state. Otherwise, step S1080 is executed, determining whether there is a storage area with a temperature lower than t_set-Δt_part. If there is a storage area with a low temperature, proceed to step S1090 to block the air outlet window 311 of the corresponding storage area; otherwise, proceed to step S1100 to determine if the temperature inside the cabinet is lower than t_set. If the temperature inside the cabinet is lower than t_set, proceed to step S1110 to control the refrigeration system to stop refrigeration; otherwise, return to step S1010 and continue to acquire detection information. After completing steps S1030, S1050, S1070, S1090, or S1110, also return to step S1010 to redetermine the target adjustment position based on the updated detection information. This loop updates the target adjustment position according to changes in defrosting status, cabinet temperature, and shelf temperature information.

[0094] The cabinet opening adjustment device 200 alters the physical covering structure at the cabinet opening 111 that participates in air exchange. The display section 211 maintains the observation path through the light-transmitting area 214, the retrieval section 212 forms a temporary passageway through the retrieval port 215 and the elastic membrane flap 216, and the insulation section 213 increases the thermal resistance at the cabinet opening through a continuous curtain and a heat-insulating material layer 217. The three curtain sections are not simply variations in the opening ratio of the same curtain, but rather multiple functional areas with different physical structures.

[0095] The air duct adjustment device 300 alters the connection between the air duct 130 and different storage areas. The position of the movable adjustment plate 320 determines the overlap between the vent 321 and the air outlet window 311, thus determining the storage area covered by the air supply. Overall air supply, central air supply, single-layer local air supply, single-layer overcooling protection, and closed state can be identified through the mechanical position of the movable adjustment plate 320 and the correspondence between the vent 321 and the air outlet window 311.

[0096] The control unit 410 incorporates the two aforementioned mechanical states into the same scene control process. For example, short-term door opening for retrieval corresponds to the combination of the retrieval section 212 and the adjustment position before the door opens; continuous door opening corresponds to the combination of the retrieval section 212 and the closed position; non-business hours correspond to the combination of the insulation section 213 and the top-floor local air supply position; business hours with no one present correspond to the combination of the insulation section 213 and the central air supply position; business hours with personnel activity correspond to the combination of the display section 211 and the floor temperature adaptive air supply position. During defrosting, the air duct side remains in the closed position, while the cabinet side selects either the display section 211 or the retrieval section 212 based on the door state.

[0097] The resetting function of the elastic diaphragm flap 216, the positioning function of the electromagnet 340, the inter-plate sealing function of the brush sealing strip 322, and the synchronous driving function of the lead screw 331 and the synchronous belt correspond to the restoration of the access port 215, the contact of the moving adjustment plate 320, the suppression of bypass leakage, and the stability of movement, respectively. The above-mentioned lower-level structure is used to reliably realize the target curtain section and the target adjustment position in actual operation, but does not change the overall control relationship of the control unit 410 in determining the two target states based on the same operating scenario information.

[0098] The improved temperature field uniformity described in this disclosure refers to the control unit 410 altering the local airflow path based on the temperature information of different storage areas, allowing areas with higher temperatures to receive more airflow or reducing the amount of cooling received by areas with lower temperatures. Reducing the amount of defrosting heat entering the storage space 112 involves the movable adjustment plate 320 blocking the air outlet window 311 during defrosting, structurally altering the connection between the air duct 130 and the storage space 112, and reducing the transfer of defrosting heat to the storage space 112, thus concentrating the defrosting heat more in the area where the evaporator 141 is located. Reducing the frosting load involves the cabinet opening adjustment device 200 limiting the effective opening of the cabinet opening 111 when the door 120 is open, and the control unit 410 stopping the active airflow from the fan 142, thereby reducing the entry of high-temperature, high-humidity air into the storage space 112. This control method helps to extend the interval between adjacent defrosting processes and is suitable for low-temperature operating models such as beer coolers. The specific degree of temperature improvement, defrosting time, defrosting interval, and energy consumption changes are related to the cabinet structure, ambient temperature and humidity, item load, defrosting method, and control parameters.

[0099] To verify the above-mentioned technical effects, under the same ambient temperature and humidity, the same storage load, the same set temperature, and the same door opening or defrosting conditions, a reference cabinet without the cabinet opening adjustment device 200 and the movable air duct adjustment device 300 was compared with the refrigerated display cabinet 100 of this embodiment. The amount of heat and moisture intrusion during door opening, the interlayer temperature difference during stable operation, the temperature rise of the storage space during defrosting, the full-load temperature pulling time, and the energy consumption per unit time were recorded. The degree of improvement of each indicator is based on actual measurement or simulation results, and a fixed improvement ratio is not limited based on this when specific data is not available.

[0100] In the embodiment where the control unit 410 is implemented using a programmable logic controller (PLC), the control unit 410 includes a processor and a memory. The memory stores computer programs, operating scene parameters, state combination mappings, and target position parameters. When the processor executes the computer program, it completes the steps of acquiring operating scene information, identifying the operating scene, determining the target state combination, and controlling the control cabinet port adjustment device 200 and the air duct adjustment device 300. The computer program is stored in a non-transitory computer-readable storage medium.

[0101] The above embodiments describe the cabinet structure, multiple curtain segments, air duct adjustment structure, detection input, and scene control process. The specific materials, dimensions, temperature offsets, time thresholds, movement distances, and number of door openings in each embodiment illustrate the specific implementation of the technical solution. Based on the cabinet opening adjustment device 200 having multiple curtain segments with different physical structures, the air duct adjustment device 300 having multiple adjustment positions corresponding to different air supply states, and the control unit 410 determining and executing two target states based on the same operating scene information, the corresponding parameters are set according to the specifications and usage conditions of the refrigerated display cabinet 100.

[0102] The above description represents specific embodiments of this disclosure. The scope of protection of this disclosure is defined by the claims.

Claims

1. A refrigerated display case, characterized in that, include: The cabinet is equipped with an opening and an air duct; A cabinet opening adjustment device is provided at the cabinet opening and includes a curtain that can move relative to the cabinet opening. The curtain has multiple curtain segments, and at least two of the curtain segments are different in the way the light-transmitting area is set or the way the through opening is set. The air duct adjustment device is installed on the air inlet side or air outlet side of the air duct and has multiple adjustment positions. Different adjustment positions correspond to different air supply states of the air duct. as well as The control unit is connected to the cabinet opening adjustment device and the air duct adjustment device respectively. It is used to determine the target curtain segment among the multiple curtain segments and the target adjustment position among the multiple adjustment positions based on a set of operating scenario information characterizing the same operating scenario, control the cabinet opening adjustment device to make the target curtain segment correspond to the cabinet opening, and control the air duct adjustment device to be in the target adjustment position.

2. The refrigerated display cabinet according to claim 1, characterized in that, The plurality of curtain segments include a display segment, which has a light-transmitting area.

3. The refrigerated display cabinet according to claim 1, characterized in that, The plurality of curtain segments include a retrieval segment, the retrieval segment having a through retrieval opening, and the retrieval opening having an elastic membrane flap; The elastic flap deforms when subjected to external force to open the access port, and returns to the position that blocks the access port after the external force is removed.

4. The refrigerated display cabinet according to claim 1, characterized in that, The plurality of curtain segments include an insulation segment, which has no through opening and includes a layer of thermal insulation material.

5. The refrigerated display cabinet according to claim 1, characterized in that, The air duct includes a fixed air duct plate, which has multiple air outlet windows corresponding to different storage areas inside the cabinet. The air duct adjustment device includes a movable adjustment plate that can move relative to the fixed air duct plate. The movable adjustment plate is provided with multiple ventilation openings. When the movable adjustment plate is in different adjustment positions, the multiple ventilation openings and the multiple air outlet windows form different correspondences.

6. The refrigerated display case according to claim 5, characterized in that, The air duct adjustment device also includes an electromagnet disposed between the movable adjustment plate and the fixed air duct plate; The control unit is also used to de-energize the electromagnet before driving the movable adjustment plate to move, so as to release the attraction between the movable adjustment plate and the fixed air duct plate, and to energize the electromagnet after the movable adjustment plate reaches the target adjustment position, so that the movable adjustment plate is attracted to the fixed air duct plate.

7. The refrigerated display cabinet according to claim 3, characterized in that, The refrigerated display cabinet also includes a door and a door switch sensor. The door is located at the cabinet opening, and the door switch sensor is signal-connected to the control unit. The control unit is also used to identify the retrieval segment as the target curtain segment when the door status information generated by the door switch sensor indicates that the door is open.

8. The refrigerated display cabinet according to claim 7, characterized in that, The control unit is also configured to determine the target adjustment position based on the opening duration of the door; If the opening duration does not reach the preset duration, the adjustment position of the air duct adjustment device before the door is opened is determined as the target adjustment position; When the opening duration reaches the preset duration, the adjustment position corresponding to the closed state of the air duct is determined as the target adjustment position.

9. The refrigerated display case according to claim 7, characterized in that, The control unit is also used to obtain the number of times the door is opened within a preset statistical period after the door is closed; When the number of openings reaches a preset number, the adjustment position corresponding to the overall air supply state of the air duct is determined as the target adjustment position.

10. The refrigerated display case according to claim 1, characterized in that, The control unit is also connected to the refrigeration system of the refrigerated display cabinet and is used to determine the adjustment position corresponding to the closed state of the air duct as the target adjustment position when it receives defrosting status information indicating that the refrigerated display cabinet is in a defrosting state.

11. A method for controlling a refrigerated display case, characterized in that, include: Acquire a set of operating scenario information, wherein the set of operating scenario information represents the same operating scenario of the refrigerated display cabinet; Based on the set of operating scenario information, a target curtain segment is determined from multiple curtain segments of the cabinet opening adjustment device, and a target adjustment position is determined from multiple adjustment positions of the air duct adjustment device. Among them, at least two of the curtain segments are different in the setting method of the light-transmitting area or the setting method of the through opening. Different adjustment positions correspond to different air supply states of the air duct of the refrigerated display cabinet. Control the cabinet opening adjustment device to align the target curtain section with the cabinet opening of the refrigerated display cabinet, and control the air duct adjustment device to be in the target adjustment position.

12. The refrigerated display case control method according to claim 11, characterized in that, The set of operational scenario information includes: The door status information and the duration of the door being opened or closed are used to indicate the door's status. Based on the aforementioned set of operational scenario information, determining the target curtain segment and the target adjustment position includes: When the door status information indicates that the door is open, the section with the access opening among the multiple curtain sections is identified as the target curtain section; If the opening duration does not reach the preset duration, the adjustment position of the air duct adjustment device before the door is opened is determined as the target adjustment position; When the opening duration reaches the preset duration, the adjustment position corresponding to the closed state of the air duct is determined as the target adjustment position.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the refrigerated display case control method of claim 11.

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