Multi-window horizontal refrigerator and method for removing condensation from the window thereof

Abstract

The present application relates to the technical field of refrigeration equipment, and provides a multi-view window horizontal refrigerator and a view window dew condensation removal method thereof, which comprises a cabinet body, a cabinet opening structure, a view window, a cabinet door and a controller. The view window is composed of a frame structure with a top opening and a view window glass installed between the frame structure and the cabinet opening structure. The view window glass is arranged between the frame structure and the cabinet opening structure. A temperature and humidity sensor for measuring the temperature and humidity outside is arranged on the frame structure. The view window glass is a multi-layer hollow view window glass. A temperature sensor for measuring the temperature of the outer layer of the view window glass and a heating wire for heating the view window glass are pre-installed in the view window glass. The controller collects the outside temperature and humidity measured by the temperature and humidity sensor to calculate the dew point temperature, and collects the surface temperature of the view window glass measured by the temperature sensor. Based on the surface temperature of the view window glass and the difference between the surface temperature and the dew point temperature, the actual output power of the heating wire is adjusted by a power regulator, and the heating energy consumption of the view window can be reduced by 30%-60%.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a multi-window horizontal freezer and a method for removing condensation from its windows. Background Technology

[0002] Horizontal freezers are widely used in supermarkets, convenience stores, fresh food markets, and other commercial establishments for displaying and storing frozen foods. To enhance product display, an increasing number of commercial horizontal freezers are adopting glass window designs. In recent years, a new type of commercial horizontal freezer with three glass windows (front, left, and right) has emerged, increasing the display area by more than 50% compared to traditional single-sided window freezers, significantly improving product display and giving the products a premium feel. However, existing commercial horizontal freezers with glass windows, especially the aforementioned three-sided glass window freezers, generally suffer from the following serious defects in their anti-condensation heating systems:

[0003] 1. Extremely high energy consumption: The heating wires adopt a full-power, all-time operation mode. As long as the freezer is turned on, the heating wires of all windows will continue to operate at the rated power. The energy consumption of window heating accounts for 20%-30% of the total energy consumption of the freezer, which seriously affects the product's energy efficiency rating.

[0004] 2. Undifferentiated Control: The condensation risk differs significantly among the front, left, and right side windows. The front window, directly facing the customer, is more affected by customer touch, ambient airflow, and lighting, resulting in the highest condensation risk. The left and right side windows, typically placed against a wall or adjacent to each other, have a lower condensation risk. However, the existing system uses uniform heating power for all windows, leading to overheating of the low-risk windows and energy waste.

[0005] 3. Lack of environmental adaptability: It cannot dynamically adjust the heating power according to changes in ambient temperature and humidity, and still operates at full power in low temperature and low humidity environments, further aggravating energy waste.

[0006] 4. Poor reliability: It lacks a heating wire failure detection function. When the heating wire is damaged, it cannot alarm in time, which leads to serious condensation in the display window, affecting the product display effect and even causing customer complaints. Summary of the Invention

[0007] To address the high energy consumption of decondensation removal in existing horizontal freezers, the first objective of this invention is to provide a multi-window horizontal freezer, comprising:

[0008] Cabinet, wherein the cabinet has a receiving chamber;

[0009] The cabinet opening structure is provided on the cabinet body;

[0010] A viewing window is provided on the cabinet opening structure and consists of a frame structure with a top opening and a viewing window glass installed between the frame structure and the cabinet opening structure. The viewing window glass is located between the frame structure and the cabinet opening structure. The viewing window glass includes a front viewing window glass, a left viewing window glass, and a right viewing window glass, all of which are multi-layer hollow viewing window glass. The viewing window glass is equipped with a heating wire for heating the viewing window glass.

[0011] Temperature and humidity sensors are installed on the outside of the cabinet to measure the temperature and humidity of the ambient environment outside the freezer.

[0012] A temperature sensor is used to collect the surface temperature of the viewing window glass;

[0013] Cabinet doors, installed on the frame structure, are used to open and close the opening;

[0014] The controller collects the ambient temperature and humidity measured by the temperature and humidity sensor to calculate the dew point temperature, and collects the surface temperature of the window glass measured by the temperature sensor. Based on the surface temperature of the window glass and the difference between it and the dew point temperature, the controller adjusts the actual output power of the heating wire via a power regulator.

[0015] Specifically, the frame structure includes a front window frame located at the front of the cabinet, side window frames located on the left and right sides of the cabinet, and a support frame connecting the front window frame and the side window frames. Temperature and humidity sensors are respectively installed on the front window frame and the side window frames; each window is equipped with a temperature sensor to collect the glass surface temperature of the corresponding window.

[0016] Specifically, the frame structure includes a front window frame located on the front side of the cabinet, side window frames located on the left and right sides of the cabinet, and a support frame connecting the front window frame and the side window frames. Temperature and humidity sensors are respectively installed on the front window frame and the side window frames.

[0017] Specifically, a column is provided at the corner of the front side of the cabinet structure, and the support frame is fixedly connected to the column. The support frame includes a frame body and a wall panel movably connected to the side wall of the frame body. The frame body and the wall panel enclose a wiring cavity. A wire inlet hole is provided at the bottom of the support frame, and a wire outlet hole is provided on the side wall of the support frame. The cable of the viewing window glass and the temperature and humidity sensor is electrically connected to the controller through the wiring cavity.

[0018] Specifically, the front window, left window, and right window are each equipped with a weighting coefficient. , and ,in Heating power of each window based on weighting coefficients Make corrections to obtain the actual output power. , .

[0019] Specifically, the weight coefficient of the front viewing window glass has a value of 1.1-1.3, and the weight coefficient of the left viewing window glass and the weight coefficient of the right viewing window glass have values of 0.7-0.9.

[0020] Specifically, the controller adjusts the heating power of the heating wire based on a preset safety threshold , the preset safety threshold is directly proportional to the air humidity, and when the difference value is reached, the heating wire of the corresponding viewing window is turned off; when is reached, the heating power of the corresponding heating wire is controlled to operate at 30%-50% of the rated power P; when is reached, the power of the corresponding heating wire is controlled to operate at 70%-100% of the rated power P.

[0021] Specifically, when , , ;

[0022] when , , .

[0023] Specifically, the controller collects the surface temperature of the viewing window glass and calculates the temperature difference change rate of the viewing window glass. When the temperature difference change rate of the viewing window is less than the preset change rate threshold, the controller controls the heating wire to continuously operate at the rated power state for a preset duration.

[0024] Specifically, the controller collects the storage temperature Tc measured by the temperature sensor in the cabinet, and when the controller calculates the heating power , a temperature correction coefficient inside the cabinet is introduced ,

[0025] When Tc≤-18°C, ;

[0026] When -18°C<Tc≤-10°C, ;

[0027] When Tc>-10°C, .

[0028] The second object of the present invention is to provide a method for removing condensation on the viewing windows of a horizontal multi-view-window freezer, which uses the above-mentioned horizontal multi-view-window freezer, comprising: ​

[0029] S1: Collect ambient temperature T and relative humidity based on a preset frequency;

[0030] S2: Dew point temperature is calculated using the Magnus formula;

[0031] S3: Collect the temperature of the first surface of the front glass window respectively. The second surface temperature of the left glass window The third surface temperature of the right-side glass window ;

[0032] S4: For each window, calculate the difference between its surface temperature Ts and dew point temperature Td. , And based on the difference The operating power of the corresponding heating wire can be adjusted independently.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. This invention provides a multi-window horizontal freezer and a method for decondensation removal from the windows. Based on the surface temperature of the window glass and the difference between it and the dew point temperature, the actual output power of the heating wire is adjusted by a power regulator. Through independent zone control and dynamic power adjustment, the energy consumption for window heating can be reduced by 30%-60%, significantly improving the overall energy efficiency level of the freezer and meeting the latest national energy efficiency standards and energy-saving policy requirements.

[0035] 2. This invention provides differentiated control over the risk of condensation in windows at different locations. It introduces a location weighting coefficient to correct the heating power, thereby avoiding condensation in the windows with low energy consumption and ensuring the best product display effect.

[0036] 3. This invention uses a temperature sensor measurement structure to determine the impact of cold air overflowing when the door is opened, and dynamically adjusts the operating status of the heating wire according to the temperature change rate.

[0037] 4. The heating wire power of this invention is dynamically adjusted according to actual needs, which greatly reduces the running time and full-load running time of the heating wire, and can extend the service life of the heating wire by 2-3 times, effectively reducing product maintenance costs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the cabinet opening structure and support frame assembly according to the first embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the cabinet opening structure according to the first embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the front structure of the frame according to the first embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the rear structure of the frame according to the first embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the window structure according to the first embodiment of the present invention;

[0044] Figure 7 This is a side view of the first embodiment of the present invention.

[0045] Figure 8 This is a cross-sectional view of the front window of the first embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0047] Figure 10 This is a cross-sectional view of the side window of the second embodiment of the present invention.

[0048] Attached reference numerals: 1. Cabinet body; 2. Cabinet opening structure; 21. Upright column; 22. Mounting groove; 23. Locking block; 24. First limiting groove; 25. Baffle; 26. First inner limiting plate; 3. Viewing window; 31. Front viewing window frame; 311. U-shaped groove; 312. Supplementary light; 313. Second limiting groove; 314. Inner baffle; 32. Side viewing window frame; 321. Third limiting groove; 33. Support frame; 331. Frame body; 332. Wall panel; 333. Outer limiting plate; 334. Clearance groove; 335. Cable inlet hole; 336. Cable outlet hole; 337. Reinforcing rib; 338. Second inner limiting plate; 34. Front viewing window glass; 35. Side viewing window glass; 36. Slide rail; 37. Pressure strip; 4. Cabinet door; 41. First cabinet door; 42. Second cabinet door. Detailed Implementation

[0049] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0050] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] A multi-window horizontal freezer includes a cabinet body 1, a cabinet opening structure 2 on the cabinet body 1, a top-opening window 3 installed on the cabinet opening structure 2, and a cabinet door 4 fitted onto the window 3. The window 3 is located in the side wall of the freezer, allowing users to see the items inside the freezer from multiple directions, facilitating selection. This type of horizontal freezer is suitable for freezing applications such as ice cream freezers. While ensuring good insulation and low energy consumption, it provides users with a window 3 to view the goods inside, allowing them to see the products directly from a distance without having to approach, and also making it convenient for shorter users, such as children, to directly view and select items through the window 3.

[0052] Example 1

[0053] The cabinet 1 contains an inner liner for storing items. An opening is located at the top of the cabinet 1, and a cabinet opening structure 2 is installed at the opening. Cabinet opening structure 2 is made of rigid plastic materials such as PVC. The opening and cabinet opening structure 2 are inclined, with the front lower than the back. Viewing windows 3 are installed on the front and left and right sides of cabinet opening structure 2. Inclined storage racks can be built on cabinet opening structure 2, and items such as ice cream buckets can be placed in these racks. The cabinet 1 preferably uses a direct-cooling refrigeration system. A coiled evaporator is wrapped around the outer periphery of the inner liner. The evaporator pipes are correspondingly wrapped around the outer periphery of the storage racks, and the evaporator pipes are also arranged inclined, with the front lower than the back, and are nearly parallel to cabinet opening structure 2.

[0054] The viewing window 3 comprises viewing glass and a frame structure. The viewing glass is fixedly installed between the cabinet opening structure 2 and the frame structure, including a front viewing window 34 located on the front side of the cabinet 1 and side viewing windows 35 located on the left and right sides of the cabinet 1 respectively. The viewing glass is double-layered, triple-layered, or other multi-layered insulated tempered coated glass with anti-fingerprint treatment. A heating wire is installed in the viewing window 3. The heating wire can be embedded in the insulated glass interlayer or applied to the outer surface of the outermost glass layer near the two ends of the glass. The heating wire is preferably a low-radiation heating wire, which provides uniform heating and does not obstruct the view.

[0055] A temperature sensor is also included to acquire the surface temperature of the viewing window glass. This sensor can be installed in the interlayer or outer layer of the viewing window glass, or at any location that can indirectly or directly collect the glass surface temperature, such as the front viewing window frame, side viewing window frame, inside the cabinet door, or a temperature probe inside the cabinet. The controller only needs to be able to acquire the corresponding glass temperature value for each viewing window to calculate the dew point difference and adjust the power. Preferably, a temperature sensor is pre-installed on the inner surface of the outer glass layer, located in the lower 1 / 3 area of ​​the inner surface of the outermost glass layer, to measure the glass surface temperature. The temperature sensor is electrically connected to the controller. The heating wires of each viewing window are electrically connected to the controller via a power regulator. The power regulator uses a PWM power adjustment module to adjust the operating power of each heating wire. The temperature sensor measures the glass surface temperature. When the glass surface temperature is lower than the dew point temperature, the controller uses the heating wires to heat the outer glass layer, raising its temperature above the dew point temperature to prevent condensation from forming on the glass surface and affecting the user's view of the goods inside the cabinet.

[0056] Furthermore, an alarm module can be installed, including LED indicator lights and a buzzer, located on the control panel of the freezer. This module is used to issue an audible and visual alarm signal when the heating wire malfunctions. The fault detection module determines the fault condition of the heating wire based on the magnitude of the heating wire current collected at a preset frequency. When the operating current of a heating wire deviates from its rated current range by ±20% for more than 10 seconds, a corresponding heating wire fault alarm signal is generated in window 3 to alert the staff. This allows the staff to detect the heating wire fault in a timely manner and avoid the impact on business operations due to condensation in window 3.

[0057] The frame structure is made of metal materials such as aluminum alloy, including a front window frame 31 located at the front of the cabinet 1, side window frames 32 located on the left and right sides of the cabinet 1, and a support frame 33 connecting the front window frame 31 and the side window frames 32. The metal frame structure has high bending stiffness and compressive strength. While bearing the cabinet door 4 which is frequently pushed and pulled and fixing the window glass, it applies pressure to the edge of the glass with mechanical pre-tensioning force, forcing the window glass to be squeezed inward to fill the gap between the glass and the frame structure, thus achieving a tight multi-layer seal and a firm lock.

[0058] A column 21 is provided at the corner of the front side of the cabinet structure 2 to fix the window frame to the cabinet structure 2 and to provide internal support for the installation of the window glass. A support frame 33 is fixedly connected to the column 21. The support frame 33 and the column 21 cooperate to limit the glass position, and the window glass with heating wire and sensor is electrically connected to the controller inside the cabinet 1 via the support frame 33. The support frame 33 includes a frame body 331 and a wall panel 332 movably connected to the side wall of the frame body 331. The wall panel 332 is located at the corner of the frame body 331. The frame body 331 and the wall panel 332 enclose a wiring cavity. The wall panel 332 is connected to the frame body 331 by hinges or snaps to close the wiring cavity. The frame 331 is installed on the outside of the column 21. A clearance groove 334 is provided at the corner of the frame 331 away from the wall panel 332. The column 21 is embedded in the clearance groove 334 and is fixedly connected to the support frame 33 by multiple bolts in the wiring cavity. The bottom of the support frame 33 is also provided with bolt holes. The support frame 33 is fixedly installed to the cabinet opening structure 2 by bolts. The support frame 33 is provided with an outer limiting plate 333 near the outer side of the window glass, the column 21 is provided with a first inner limiting plate 26 near the outer side of the window glass, and the support frame 33 is provided with a second inner limiting plate 338 near the inner side of the window glass. The second inner limiting plate 338 is located above the first inner limiting plate 26. The first inner limiting plate 26 and the second inner limiting plate 338 are spliced ​​together to form a continuous inner support. The inner limiting plate and the outer limiting plate 333 cooperate to form a groove that clamps and limits the front and rear positions of the window glass. The left and right ends of the window glass are embedded between the inner limiting plate and the outer limiting plate 333.

[0059] A temperature and humidity sensor is installed on the outside of the freezer to measure the temperature and humidity of the external environment. The sensor is located at least on the outside of the front window frame 31. Preferably, temperature and humidity sensors are installed on the outside of both the side window frame 32 and the front window frame 31, respectively. These sensors are positioned at the center of the front and side window frames 31 and are used to measure the current air temperature and humidity near the front and side windows, respectively. The temperature and humidity sensors are electrically connected to a controller. The controller calculates the dew point temperature based on the current temperature and humidity. When the temperature sensor detects that the current glass surface temperature is lower than the dew point temperature, it controls a heating wire to heat the glass surface, thereby preventing condensation on the window 3 by raising the glass surface temperature above the dew point temperature.

[0060] The support frame 33 has an inlet hole 335 at its bottom. Cables with first connectors extend into the wiring cavity through the inlet hole 335. The side wall of the support frame 33 has an outlet hole 336. Cables for the front window glass 34, side window glass 35, supplementary light 312, and sensors connect to the wiring cavity through the outlet hole 336. The ends of the cables of each component are equipped with matching second connectors. By connecting the first connector and the second connector at the wiring cavity, the window glass, supplementary light 312, and sensors are connected to the controller and power supply within the wiring cavity, facilitating cable routing and connection. For later cable maintenance, glass replacement, or supplementary light 312 replacement, the connectors can be directly plugged in and unplugged by disassembling the wall panel 332, making disassembly and maintenance convenient and reducing the difficulty of after-sales repair. After the cover plate 332 is closed, the bolts, cables and connectors connecting the front window frame 31 and the side window frame 32 to the frame 331 are all hidden in the closed wiring cavity, ensuring the aesthetics of the overall structure.

[0061] In addition, since low-temperature air has a higher density and tends to move downwards, while high-temperature air has a lower density and tends to move upwards, the temperature on the lower part of the window 3 is lower. The support column 21 is set to prevent the formation of thermal bridges in the lower part of the window 3. The plastic material with a low thermal conductivity isolates the lower part of the support frame 33 from the inside of the cabinet 1, thereby reducing the energy consumption of the freezer.

[0062] The column 21 and the support frame 33 work together to form a slot, ensuring the stability of the window glass installation. At the same time, the column 21 shields the inside of the support frame 33, preventing the low-temperature air below from being conducted to the outside through the support frame 33, which would increase energy consumption. It also integrates the column 21 and the support frame 33 into one, improving the aesthetics of the corner connection structure.

[0063] The front window frame 31, side window frame 32, support frame 33, and cabinet opening structure 2 work together to form a four-sided sliding groove 36 on the upper side of the window 3. The cabinet door 4 is slidably installed in the sliding groove 36. The sliding groove 36 has a three-layer stepped structure. The first cabinet door 41 and the second cabinet door 42 are slidably installed on the first and second layers, respectively. A sealing strip is provided between the first cabinet door 41 and the second cabinet door 42. The second and third sliding grooves of the front window frame 31 are respectively provided with threaded holes, and corresponding bolt holes are provided in the frame 331. The left and right ends of the front window frame 31 are fixedly connected to the support frame 33 by bolts. Threaded holes are provided in any two layers of sliding grooves 36 of the side window frame 32, and corresponding bolt holes are provided in the frame 331. The front end of the side window frame 32 is fixedly connected to the support frame 33 by bolts. The rear end of the cabinet opening structure 2 is provided with a mounting groove 22 corresponding to the position of the threaded holes of the side window frame 32. The mounting groove 22 is provided with bolt holes. The rear end of the side window frame 32 is fixedly connected to the rear end of the cabinet opening structure 2 by bolts screwed into the mounting groove 22, thereby realizing the fixed connection between the side window frame 32, the support frame 33, and the cabinet opening structure 2. A locking block 23 is provided at the mounting groove 22. The locking block 23 is snapped onto the mounting groove 22, hiding the mounting groove 22 to improve the aesthetics of the cabinet structure.

[0064] The front window frame 31 is also equipped with a supplementary light 312. A U-shaped groove 311 is provided on the side of the first layer of the front window frame 31 away from the front window glass 34. The upper and lower sides of the U-shaped groove 311 are provided with slots, in which the supplementary light 312 is engaged. The supplementary light 312 can be an LED light strip, which is directed towards the goods inside the cabinet to illuminate the goods inside the cabinet and improve the display effect.

[0065] In cabinet structure 2, a first limiting groove 24 is provided at the installation positions corresponding to the front viewing window glass 34 and the side viewing window glass 35. A second limiting groove 313 and a third limiting groove 321 are respectively provided below the front viewing window frame 31 and the side viewing window frame 32. The limiting plate cooperates with the limiting groove to confine the glass to the limiting groove on all four sides, ensuring the stability of the viewing window glass installation. A baffle 25 is provided at the rear end of cabinet structure 2 to limit the narrow rear end of the side viewing window glass 35.

[0066] During the assembly of window 3, the supplementary light 312 is pre-installed on the front window frame 31. First, the frame 331 and the column 21 are connected with bolts. Then, the front window glass 34 and the side window glass 35 are vertically inserted into the groove formed by the inner limiting plate and the outer limiting plate 333. The cable located at the edge of the glass extends into the wiring cavity from the cable outlet 336. After the glass is positioned, the front window frame 31 and the side window frame 32 are installed and the bolts are tightened. As the frame structure is tightened, pressure is applied to the edge of the glass. The edges of the frame and the edge of the glass fit tightly together, forcing the glass to be squeezed inward to fill the gap between the glass and the frame structure, achieving a tight multi-layer seal and a firm lock, forming a stable U-shaped integrated window 3 system. Then, the cables are connected at the support frame 33. The cables of the window glass and the supplementary light 312 are electrically connected to the cables reserved in the cabinet 1 to meet the lighting and supplementary lighting requirements. After the connection is completed, the wall panel 332 is closed to complete the assembly of window 3.

[0067] Example 2

[0068] As shown in the figure, in Embodiment 2, the window glass is externally attached by adhesive to achieve the fixation of the window glass and the frame structure.

[0069] Compared to Embodiment 1, the cabinet structure 2 lacks the first limiting groove 24 and baffle 25, the front window frame 31 and the side window frame 32 lack the second limiting groove 313 and the third limiting groove 321, and the inner sides of the front window frame 31 and the side window frame 32 are respectively provided with inner baffles 314, while the support frame 33 lacks an outer limiting plate 333. The inner baffle 314, the first inner limiting plate 26, the second inner limiting plate 338, and the surfaces of the cabinet structure 2 corresponding to the installation positions of the window glass are coated with a sealant layer, such as silicone structural sealant. A pressure strip 37 is also provided along the circumferential direction on the outer edge of the window glass, and the pressure strip 37 is fixedly connected to the cabinet structure 2 and the window frame by bolts. The window glass is fixed by the sealant layer and the pressure strip 37, achieving stable installation and reliable sealing of the three-sided glass window 3.

[0070] This invention also provides a method for decondensing multi-window horizontal freezers, comprising:

[0071] S1: Collect ambient temperature T and relative humidity based on a preset frequency;

[0072] S2: Dew point temperature is calculated using the Magnus Formula;

[0073] S3: Collect the temperature of the first surface of the front glass window respectively. The second surface temperature of the left glass window The third surface temperature of the right-side glass window ;

[0074] S4: For each window, calculate the difference between its surface temperature Ts and dew point temperature Td. , And based on the difference The operating power of the corresponding heating wire can be adjusted independently.

[0075] In some embodiments, only one temperature and humidity sensor is installed in the middle of the front side of the freezer to detect the overall ambient temperature and humidity. The controller calculates the overall dew point temperature Td based on the overall ambient temperature and humidity, and then presets a fixed power distribution ratio according to the position characteristics of the three windows. For example, the front window glass accounts for 50% of the total power, the left window accounts for 25%, and the right window accounts for 25%. When heating is required, the controller calculates the total heating power based on the overall ambient temperature and humidity and the glass surface temperature, and then distributes it to the heating wires of the three windows according to the preset ratio.

[0076] In some embodiments, temperature and humidity sensors are respectively installed on the outer sides of the side window frame and the front window frame, and the difference between the surface temperature Ts and the dew point temperature Td can be calculated based on the temperature and humidity information collected by each temperature and humidity sensor. According to the difference The operating power of each heating element can be independently adjusted to provide differentiated control over the risk of condensation at different viewing windows. Details are as follows:

[0077] S1: Collect the first ambient temperature corresponding to the front window glass based on a preset frequency. and first relative humidity The second ambient temperature corresponding to the left viewing window glass Second relative humidity The third ambient temperature corresponding to the right-side window glass and third relative humidity .

[0078] S2: Based on the ambient temperature and relative humidity data near each window, the Magnus formula is used to calculate the dew point temperature corresponding to the front window, left window, and right window respectively. , , .

[0079] S3: Detect the temperature of the first surface of the front glass window respectively. The second surface temperature of the left glass window The third surface temperature of the right-side glass window ;

[0080] S4: For each window, calculate the difference between its surface temperature Ts and dew point temperature Td. , And based on the difference The operating power of the corresponding heating wire can be adjusted independently.

[0081] Specifically, the front window, left window, and right window are each assigned a weighting coefficient. , and ,in Heating power of each window based on weighting coefficients Make corrections to obtain the actual output power. , Front window glass weighting factor The preferred value is 1.1-1.3, and the weighting coefficient for the left window glass is... and the weighting factor of the right window glass The optimal value is 0.7-0.9. A position weighting coefficient is introduced to correct the heating power, ensuring that there is no condensation in any viewing window under any environmental conditions, thus guaranteeing the best product display effect.

[0082] Furthermore, step S4 also includes: setting a preset safety threshold. ,when When, turn off the heating wire in the corresponding window; when At that time, control the heating power of the corresponding heating wire. Operating at 30%-50% of rated power P , ;when At that time, control the power of the corresponding heating wire. Operating at 70%-100% of rated power P, , Preset security threshold The optimal value is 1.5℃-4.5℃, taking into account practical engineering factors such as sensor measurement error, uneven temperature distribution on the glass surface, ambient airflow fluctuations, and control hysteresis. At temperatures below 1.5℃, condensation is easily caused by the factors mentioned above; when Temperatures above 4.5℃ will cause unnecessary energy waste; a further optimized temperature is 3℃, achieving optimal energy saving while ensuring anti-condensation effectiveness. (Preset safety threshold) It can be dynamically adjusted according to the relative humidity of the environment, and is directly proportional to the humidity. hour, ;when hour, ;when hour, .

[0083] Further, step S4 further includes: calculating the temperature difference change rate V of each window in real time, and when the temperature difference change rate of a certain window is less than a preset change rate threshold, immediately switching the heating wire of that window to full-power operation, and resuming the normal control logic after lasting for a preset duration; wherein the change rate threshold of the front window glass is smaller than the change rate thresholds of the left window glass and the right window glass. When the cold cabinet door is opened, a large amount of hot and humid air enters the cabinet, and cold air overflows from the top opening along the front side wall, which will cause the surface temperature of the front window glass to drop rapidly, and the temperature difference ΔT decreases sharply within a short time t. If the control is performed only based on the absolute value of ΔT, the start-up of the heating wire will be delayed, which easily causes condensation on the window.

[0084] Full-power trigger pre-judgment step: the controller calculates the temperature difference change rate of each window in real time:

[0085] ,

[0086] When the temperature difference change rate of a certain window is less than a preset change rate threshold, the heating wire of that window is immediately switched to rated power operation, and the normal control logic is restored after lasting for a preset time t.

[0087] The preset change rate threshold is set differentially according to the window position. The front window glass directly faces the door opening direction and is subjected to the maximum hot and humid impact, so a higher sensitivity, that is, a smaller change rate threshold, is set; the side window glass is less affected by the door opening, so a lower sensitivity is set to avoid false triggering of full-power heating. The change rate threshold of the front window glass ranges from -0.3°C / min to -0.6°C / min, preferably -0.4°C / min; the change rate thresholds of the left window glass and the right window glass range from -0.6°C / min to -1.0°C / min, preferably -0.8°C / min. The preset time t ranges from 1min to 5min, preferably 2min.

[0088] Adjusting the working state of the heating wire based on the temperature difference change rate, by detecting the temperature difference change rate, the risk can be pre-judged in advance before condensation occurs, and full-power heating is started immediately, which effectively avoids instantaneous condensation.

[0089] Further, in some embodiments, the heating power of the heating wire can also be adjusted in combination with the internal temperature of the cabinet. The controller collects the storage temperature Tc measured by the temperature sensor inside the cabinet, and when calculating the heating power , the temperature correction coefficient inside the cabinet is introduced . When Tc≤-18°C, ; when -18°C<Tc≤-10°C, ; when Tc>-10°C, This solution further considers the impact of cabinet temperature on condensation in the viewing window, enabling more precise anti-condensation control and improving energy efficiency by 5%-10%.

[0090] Compared to traditional full-power, full-time heating solutions, this decondensation method for the display window reduces energy consumption by 30%-60% through independent zone control and dynamic power adjustment, significantly improving the overall energy efficiency of the freezer and meeting energy efficiency standards and energy-saving requirements. The heating wire power is dynamically adjusted according to actual needs, greatly reducing the heating wire's operating time and full-load operating time, extending its lifespan by 2-3 times and effectively reducing product maintenance costs.

[0091] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-window horizontal freezer, characterized in that, include: Cabinet, wherein the cabinet has a receiving chamber; The cabinet opening structure is provided on the cabinet body; A viewing window is provided on the cabinet opening structure and consists of a frame structure with a top opening and a viewing window glass installed between the frame structure and the cabinet opening structure. The viewing window glass is located between the frame structure and the cabinet opening structure. The viewing window glass includes a front viewing window glass, a left viewing window glass, and a right viewing window glass, all of which are multi-layer hollow viewing window glass. The viewing window glass is equipped with a heating wire for heating the viewing window glass. Temperature and humidity sensors are installed on the outside of the cabinet to measure the temperature and humidity of the ambient environment outside the freezer. A temperature sensor is used to collect the surface temperature of the viewing window glass; Cabinet doors, installed on the frame structure, are used to open and close the opening; The controller collects the ambient temperature and humidity measured by the temperature and humidity sensor to calculate the dew point temperature, and collects the surface temperature of the window glass measured by the temperature sensor. Based on the surface temperature of the window glass and the difference between it and the dew point temperature, the controller adjusts the actual output power of the heating wire via a power regulator.

2. The multi-window horizontal freezer according to claim 1, characterized in that, The frame structure includes a front window frame located at the front of the cabinet, side window frames located on the left and right sides of the cabinet, and a support frame connecting the front window frame and the side window frames. Temperature and humidity sensors are respectively installed on the front window frame and the side window frames; each window is equipped with a temperature sensor to collect the glass surface temperature of the corresponding window.

3. The multi-window horizontal freezer according to claim 2, characterized in that, A column is provided at the corner of the front side of the cabinet structure. The support frame is fixedly connected to the column. The support frame includes a frame body and a wall panel movably connected to the side wall of the frame body. The frame body and the wall panel enclose a wiring cavity. A wire inlet hole is provided at the bottom of the support frame, and a wire outlet hole is provided on the side wall of the support frame. The cable of the viewing window glass and the temperature and humidity sensor is electrically connected to the controller through the wiring cavity.

4. The multi-window horizontal freezer according to claim 2, characterized in that, The front window, left window, and right window are each assigned a weighting coefficient. , and ,in Heating power of each window based on weighting coefficients Make corrections to obtain the actual output power. , .

5. The multi-window horizontal freezer according to claim 4, characterized in that, The weighting coefficient of the front window glass The value ranges from 1.1 to 1.3, representing the weighting coefficient for the left window glass. and the weighting factor of the right window glass The value ranges from 0.7 to 0.

9.

6. The multi-window horizontal freezer according to claim 1, characterized in that, The controller is based on a preset safety threshold. Adjust the heating power of the heating wire The preset security threshold It is directly proportional to air humidity, when the difference When, turn off the heating wire in the corresponding window; when At that time, control the heating power of the corresponding heating wire. Operates at 30%-50% of rated power P; when At that time, control the power of the corresponding heating wire. It operates at 70%-100% of its rated power P.

7. The multi-window horizontal freezer according to claim 6, characterized in that, when hour, , ; when hour, , .

8. The multi-window horizontal freezer according to claim 1, characterized in that, The controller collects the surface temperature of the viewing window glass and calculates the temperature difference change rate of the viewing window glass. When the temperature difference change rate of the viewing window is less than a preset change rate threshold, the controller controls the heating wire to run continuously at rated power for a preset time.

9. The multi-window horizontal freezer according to claim 1, characterized in that, The controller collects the storage temperature Tc measured by the temperature sensor inside the cabinet, and calculates the heating power. At that time, a temperature correction factor for the cabinet is introduced. , When Tc≤-18℃ ; When -18℃<Tc≤-10℃, ; When Tc > -10℃ .

10. A method for decondensing the windows of a multi-window horizontal freezer, using the multi-window horizontal freezer as described in any one of claims 1-9, characterized in that, include: S1: Collect ambient temperature T and relative humidity based on a preset frequency; S2: Dew point temperature is calculated using the Magnus formula; S3: Collect the temperature of the first surface of the front glass window respectively. The second surface temperature of the left glass window The third surface temperature of the right-side glass window ; S4: For each window, calculate the difference between its surface temperature Ts and dew point temperature Td. , And based on the difference The operating power of the corresponding heating wire can be adjusted independently.

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