Air cooling service type refrigerated display cabinet

Abstract

The invention discloses an air-cooled service type refrigerated display cabinet which comprises a lower cabinet body, a display bin arranged on the lower cabinet body, a back plate arranged in the display bin, a display plate, an air return port and a rectifying plate, the back plate and the air return port are oppositely arranged at the two ends of the display plate, and an air outlet channel is formed between the back plate and the display bin. The display plate divides the display bin into an upper display space and a lower air duct, the air duct is communicated with the air outlet duct, an evaporator and a fan are arranged in the air duct, an air outlet is formed in the back plate, and the rectifying plate is located between the air return port and the display plate. One end of the rectifying plate is connected to the display plate of the return air inlet, and the other end extends upwards along the return air inlet and then extends towards the back plate.

Description

Technical Field

[0001] This invention belongs to the refrigeration industry, specifically relating to an air-cooled service refrigerated display cabinet. Background Technology

[0002] The cooling operation status of a traditional air-cooled display case is as follows:

[0003] Cold air flows directly from one air outlet to the other. The cold air flowing from one outlet forms a forward-flowing airflow above the food. Due to gravity and the sinking effect of cold air, the cold air falls downwards onto the food surface as it flows forward within the display chamber. The more airflow and the faster the airflow speed across the food surface, the greater the food's moisture loss.

[0004] As the airflow moves forward within the display chamber, it exchanges heat and moisture with the air inside the chamber. The temperature gradually increases, the moisture content gradually increases, and the moisture absorption capacity gradually strengthens. The moisture absorption capacity reaches its peak when it approaches the return air vent. Due to the influence of the return air vent and the glass enclosure, the wind speed on the food surface near the return air vent increases and a huge turbulence zone is formed. Therefore, the closer the food is to the return air vent, the greater the dryness loss. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, a wind-cooled service-type refrigerated display case is provided.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A type of air-cooled service refrigerated display case includes a lower cabinet, a display compartment on the lower cabinet, a back panel, a display board, a return air vent, and a rectifier plate inside the display compartment. The back panel and the return air vent are positioned opposite each other at both ends of the display board, forming an air outlet duct between the back panel and the display compartment. The display board divides the display compartment into an upper display space and a lower air duct, which is connected to the air outlet duct. An evaporator and a fan are installed inside the air duct. An air outlet is opened on the back panel. The rectifier plate is located between the return air vent and the display board. One end of the rectifier plate is connected to the display board at the return air vent, and the other end extends upward along the return air vent and then towards the back panel.

[0008] Furthermore, the rectifier plate is L-shaped or arc-shaped.

[0009] Furthermore, the rectifier plate is made of a transparent material.

[0010] Furthermore, an air duct plate is installed below the display panel, which divides the air duct into a lower first air duct and an upper second air duct. There is a gap between the air duct plate and the back of the display compartment. The first air duct is connected to the second air duct and the air outlet duct through the gap. The evaporator and fan are installed in the first air duct. Several air outlet holes are provided on the display panel.

[0011] Furthermore, the vertical height of the rectifier plate is 0.2 to 2 times the height of the air outlet, and the horizontal width of the rectifier plate is 0 to 0.8 times the width of the display panel.

[0012] Furthermore, the vertical height of the rectifier plate is 0.5 to 1.5 times the height of the air outlet, and the horizontal width of the rectifier plate is 0.05 to 0.5 times the width of the display panel.

[0013] Compared with the prior art, the beneficial effects of the present invention are to reduce the amount of air flowing over the surface of food, reduce the wind speed on the surface of food, and reduce dry loss. Attached Figure Description

[0014] Figure 1 and 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0015] Figure 3 and 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0016] Figure 5 and 6 This is a schematic diagram of the structure of an existing air-cooled cabinet. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0019] like Figure 5 and 6 As shown, the return air vent of the existing air-cooled cabinet does not have a rectifier plate.

[0020] Figure 5 In the display chamber, cool air is blown out from the vents on the back panel, forming a forward-flowing airflow. Due to gravity and the sinking effect of the cool air, it falls onto the food surface as it flows forward, eventually flowing towards the return air vent. During this forward flow, it exchanges heat and moisture with the air inside the display chamber, gradually increasing in temperature and moisture content, thus enhancing its moisture absorption capacity. The moisture absorption capacity reaches its peak near the return air vent. Influenced by the return air vent and the glass enclosure, the airflow speed near the food surface accelerates, creating a large turbulent zone. Therefore, the closer the food is to the return air vent, the greater its moisture loss.

[0021] Figure 6In, referring to Chinese Patent 2023202009715, in Figure 5 Based on the previous design, air vents were added to the display panel. Some of the cool air was blown out from the air vents and directly reached the most unfavorable temperature point inside the cabinet, reducing the temperature difference inside the cabinet and improving the cooling efficiency. Part of the air flowed under the food trays, and another part flowed upward through the gaps between the trays. It can also reduce the airflow blown out from the air vent on the back panel and support it to flow forward, further reducing dry loss. However, there is still a huge turbulence zone at the return air vent, so the closer the food is to the return air vent, the greater the dry loss.

[0022] Example 1

[0023] like Figure 1 and 2 As shown, a wind-cooled service refrigerated display case includes a lower cabinet 1, a display compartment 2 set on the lower cabinet 1, a back panel 3, a display panel 4, a return air vent 5, and a rectifier plate 9 set inside the display compartment 2. The back panel 3 and the return air vent 5 are set opposite each other at both ends of the display panel 4, and an air outlet duct is formed between the back panel 3 and the display compartment 2. The display panel 4 divides the display compartment 2 into an upper display space and a lower air duct. The air duct and the air outlet duct are connected. An evaporator 6 and a fan 7 are set inside the air duct. An air outlet 8 is opened on the back panel 3. The rectifier plate 9 is located between the return air vent 5 and the display panel 4. One end of the rectifier plate 9 is connected to the display panel 4 of the return air vent 5, and the other end extends upward along the return air vent and then extends towards the back panel 3.

[0024] Example 2

[0025] like Figure 3 and 4 As shown, a type of air-cooled service refrigerated display case includes a lower cabinet 1, a display compartment 2 disposed on the upper part of the lower cabinet 1, a back panel 3 disposed within the display compartment 2, a display board 4, a return air vent 5, and a rectifier plate 9. The back panel 3 and the return air vent 5 are disposed opposite each other at both ends of the display board 4, forming an air outlet duct between the back panel 3 and the display compartment 2. The display board 4 divides the display compartment 2 into an upper display space and a lower air duct, which is connected to the air outlet duct. An evaporator 6 and a fan 7 are disposed within the air duct. An air outlet 8 is opened on the back panel 3. A duct plate 10 is provided below the display panel, which divides the air duct into a lower first air duct and an upper second air duct. There is a gap between the duct plate and the back of the display compartment. The first air duct communicates with the second air duct and the air outlet duct through the gap. The evaporator and the fan are set in the first air duct. Several air outlet holes are provided on the display panel. The rectifier plate 9 is located between the return air port 5 and the display panel 4. One end of the rectifier plate 9 is connected to the display panel 4 of the return air port 5, and the other end extends upward along the return air port and then extends towards the back panel 3.

[0026] Examples 1 and 2, by adding a rectifier plate at the return air inlet, streamlined the trajectory of the cold air, reduced the range of the turbulent zone, and prevented a large amount of highly hygroscopic airflow from sweeping over the food surface, effectively reducing the dryness loss of the food.

[0027] The rectifier plate 9 can be designed in an L-shape or arc shape, etc. The vertical height of the rectifier plate is 0.2 to 2 times the height of the air outlet, and the horizontal width of the rectifier plate is 0 to 0.8 times the width of the display plate.

[0028] To achieve better results, the vertical height of the rectifier plate should be 0.5 to 1.5 times the height of the air outlet, and the horizontal width of the rectifier plate should be 0.05 to 0.5 times the width of the display panel.

[0029] Temperature uniformity test and food dryness test

[0030]

[0031] Temperature equalization test.

[0032] Test environment: The test was conducted in a closed room with adjustable temperature and humidity. The temperature was controlled at 32±0.5℃ and the humidity at 50±5%. Test kits were used in this experiment.

[0033] This experiment used a temperature recorder to collect data. Nine temperature test points were set up in each freezer: front left, center left, rear left, front center, center center, rear center, front right, center right, and rear right. After the freezer had run for 24 hours, the internal load temperature had reached a stable state. At this point, the test temperature (°C) was recorded, with data collected every minute for 6 hours for analysis. The obtained data is shown in the table below (due to the large amount of data, only data collected every 10 minutes is included in this table).

[0034] Figure 5 cabinet type

[0035]

[0036]

[0037] Figure 1 cabinet type

[0038]

[0039]

[0040] Figure 3 cabinet type

[0041]

[0042]

[0043]

[0044] Analysis of the temperature uniformity results for the above three cabinet types: Figure 5 The temperature difference inside the cabinet is 5.1℃. Figure 1 The temperature difference inside the cabinet is 3.2℃. Figure 3 The temperature difference inside the cabinet is 2.8℃. Compared with traditional air-cooled cabinets, the temperature inside the cabinet of this invention is significantly more uniform, eliminating excessively low and high temperature points, effectively preventing some food from freezing and condensing due to low temperatures while others spoil due to excessively high temperatures.

[0045] Food dryness test.

[0046] Test environment: The test was conducted in a closed room with adjustable temperature and humidity. The ambient temperature was controlled at 32±0.5℃ and the humidity was controlled at 50±5%.

[0047] The experimental load consisted of Jiuyu brand cooked food: duck neck and duck clavicle. Each type of cooked food was packaged into three melamine plates and placed in the cabinet in front, middle and back positions to simulate a real sales scenario.

[0048] This experiment measured the weight of food before and after it was placed in the cabinet for 6 hours and observed the changes in the food's color to determine the extent of food dehydration. The weight (g) and weight loss of the food before and after the experiment are shown in the table below.

[0049]

[0050] As can be seen from the table:

[0051] Figure 5 The total weight loss of the cabinet type is 178.1g.

[0052] Figure 1 The cabinet type has a total weight loss of 101g, and its dry loss can be reduced by 43%.

[0053] Figure 3 The cabinet type has a total weight loss of 80.5g, and its dry loss can be reduced by 55%.

[0054] Observe the color and surface condition of the food:

[0055] Figure 5 Food in the cabinet will show obvious signs of drying after 1 hour, and after 6 hours the food will turn black and the surface will be dry and dull. Figure 1 After 6 hours in the display case, the food surface still showed a slight sheen, and the food surface was slightly dry, indicating that the food was in a similar condition to normal. Figure 5 The cabinet is in its 1-hour state. Figure 3 After 6 hours in the cabinet, the food surface still showed a slight sheen, with no obvious signs of drying, and the food condition was better than that of food stored in a cooler environment. Figure 5The refrigerator is in its 1-hour state. Compared to traditional air-cooled refrigerators, the food inside the refrigerator of this invention has significantly reduced dryness loss.

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

Claims

1. A wind-cooled service refrigerated display case, comprising a lower cabinet, a display compartment disposed on the lower cabinet, a back panel disposed within the display compartment, a display board, a return air vent, and a rectifier plate. The back panel and the return air vent are disposed opposite each other at both ends of the display board, and an air outlet duct is formed between the back panel and the display compartment. The display board divides the display compartment into an upper display space and a lower air duct. The air duct and the air outlet duct are connected. An evaporator and a fan are disposed within the air duct. An air outlet is opened on the back panel. The rectifier plate is located between the return air vent and the display board. One end of the rectifier plate is connected to the display board at the return air vent, and the other end extends upward along the return air vent and then extends towards the back panel.

2. The air-cooled service refrigerated display case according to claim 1, characterized in that, The rectifier plate is L-shaped or arc-shaped.

3. The air-cooled service refrigerated display case according to claim 1, characterized in that, The rectifier plate is made of a transparent material.

4. The air-cooled service refrigerated display case according to claim 1, characterized in that, A duct plate is installed below the display panel, which divides the air duct into a lower first air duct and an upper second air duct. There is a gap between the duct plate and the back of the display compartment. The first air duct is connected to the second air duct and the air outlet duct through the gap. The evaporator and fan are installed in the first air duct. Several air outlet holes are provided on the display panel.

5. A refrigerated service display cabinet with air cooling according to any one of claims 1-4, characterized in that, The vertical height of the rectifier plate is 0.2 to 2 times the height of the air outlet, and the horizontal width of the rectifier plate is 0 to 0.8 times the width of the display panel.

6. A refrigerated service display cabinet with air cooling according to claim 5, characterized in that, The vertical height of the rectifier plate is 0.5 to 1.5 times the height of the air outlet, and the horizontal width of the rectifier plate is 0.05 to 0.5 times the width of the display panel.

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