A sealing degree detection device and detection method of a refrigerated display cabinet

Abstract

The application discloses a sealing degree detection device and detection method of a refrigerated display cabinet, and mechanical touch door switch detects the opening and closing conditions of the refrigerated cabinet door body; when the mechanical touch door switch cannot detect the closing signal of the refrigerated cabinet door body, a signal is sent to the controller, the controller sends a signal to the cloud platform, and it is determined that the door body is sunken or the cabinet is deformed; after the mechanical touch door switch detects that the refrigerated cabinet door body is closed, the temperature and air pressure in the cabinet are determined through the temperature sensor and the air pressure sensor in the cabinet; if the temperature and air pressure determination results both meet the set requirements, the refrigerated display cabinet is normal; if any determination result does not meet the set requirements, the controller sends a signal to the cloud platform, and it is determined that the sealing strip of the refrigerated cabinet door body does not meet the use requirements. The application can determine whether the sealing degree of the door body meets the expected requirements, and the warning is transmitted to the relevant after-sales department through the cloud platform for the refrigerated display cabinet that does not meet the requirements, thereby playing a preliminary discrimination role for after-sales, and improving the after-sales service quality.

Description

Technical Field

[0001] This invention relates to the field of sealing testing equipment technology, and in particular to a sealing test device and method for refrigerated display cases. Background Technology

[0002] Currently, most display cases use a large, double-layered, light-transmitting glass door design. This design results in a relatively heavy door, which may sag over time, preventing the door seal from making proper contact with the case. This leads to poor sealing and compromises the display case's airtightness and refrigeration performance. While current display cases primarily rely on door seals for sealing, the complex environments in which these seals are placed can lead to aging and damage over time, causing them to fail to meet design requirements. Poor door sealing, in turn, increases energy consumption and reduces refrigeration efficiency. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the prior art, the present invention proposes a sealing degree detection device and detection method for refrigerated display cabinets.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a sealing degree detection device for a refrigerated display case, including a mechanically activated door switch for monitoring the opening and closing of the door, a pressure sensor for monitoring the gas pressure inside the case, an internal temperature sensor, an ambient temperature sensor, and a controller. The mechanically activated door switch is installed on the top of the refrigerated display case, parallel to the upper edge of the refrigerated display case door. The mechanically activated door switch, the pressure sensor, the internal temperature sensor, and the ambient temperature sensor are all electrically connected to the controller, and the controller is communicatively connected to a cloud platform.

[0005] In the aforementioned airtightness detection device for a refrigerated display case, the air pressure sensor, the internal temperature sensor, the ambient temperature sensor, and the controller are all installed in the control box at the top of the refrigerated display case.

[0006] The testing method based on any of the above-mentioned sealing testing devices for refrigerated display cases includes the following steps:

[0007] Step 1: Mechanically activate the door switch to detect the opening and closing status of the refrigerator door;

[0008] Step 2: When the mechanical door switch cannot detect the refrigerator door closing signal, the mechanical door switch sends a signal to the controller, and the controller sends a signal to the cloud platform to determine that the door has sunk or the refrigerator body has deformed.

[0009] Step 3: After the mechanically activated door switch detects that the refrigerator door is closed, the internal temperature and air pressure are determined by the internal temperature sensor and air pressure sensor. If both the temperature and air pressure results meet the set requirements, the refrigerator display cabinet is normal. If either the temperature or air pressure result does not meet the set requirements, the controller sends a signal to the cloud platform to determine that the refrigerator door sealing strip does not meet the usage requirements.

[0010] In the above-mentioned method for detecting the sealing of a refrigerated display case, step 2, "the mechanical touch door switch cannot detect the refrigerated door closing signal" means that the mechanical touch door switch does not detect the refrigerated door closing signal, and no closing signal is detected after time t1.

[0011] The above-mentioned method for detecting the sealing degree of a refrigerated display case, specifically the process of determining the internal temperature and air pressure in step 3, is as follows:

[0012] Step 3.1: The mechanical touch door switch detects that the refrigerator door is closed and starts timing. After the set time t2 is reached, the internal temperature sensor detects whether the internal temperature has reached the set temperature.

[0013] Step 3.2: If the set temperature is reached, the air pressure sensor detects the air pressure inside the cabinet and compares the measured air pressure with the air pressure threshold. If the measured air pressure is within the air pressure threshold, the refrigerated display cabinet is normal. If it is higher than the air pressure threshold, the controller sends a signal to the cloud platform to determine that the refrigerated cabinet door seal is aging.

[0014] Step 3.3: If the set temperature is not reached, the internal temperature of the refrigerator will be measured again after time t2+b. If the set temperature is still not reached, the controller will send a signal to the cloud platform to determine that the door sealing strip of the refrigerator does not meet the requirements. If the set temperature is reached, step 3.2 will be repeated.

[0015] The above-mentioned sealing detection device and method for a refrigerated display case, the specific setting process of the air pressure threshold in step 3.2 includes: according to the Clapeyron equation PV=nRT, where P represents pressure, V represents gas volume (i.e., the volume of the refrigerated display case), n represents the amount of substance, R represents the gas constant, and T represents temperature, the air pressure value P0 of the refrigerated display case at the set temperature is calculated, and P0±15% is used as the air pressure threshold.

[0016] The beneficial effects of this invention are that the door sealing degree detection refrigerated display cabinet and its detection method provided in this application can detect the structural state of the door and obtain the number of times the refrigerated display cabinet is opened and closed in real time, providing support for cold chain data analysis. When the door structure is in a normal state, when the internal temperature reaches the set temperature within a set time and the internal air pressure is within the preset air pressure threshold, it can be determined that the sealing degree of the cabinet meets the expected design requirements. When neither the internal temperature nor the internal air pressure reaches the standard, it can be determined that the sealing degree of the cabinet does not meet the expected design requirements. The controller can determine whether the door sealing degree meets the expected requirements based on the conclusions obtained from the aforementioned test method. For display cabinets that do not meet the requirements, a warning will be sent to the relevant after-sales department through the cloud platform, which plays a preliminary judgment role for after-sales service, improves the quality of after-sales service, ensures the user experience, and is energy-saving and environmentally friendly. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the detection device of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection of the detection device of the present invention;

[0020] Figure 3 This is a flowchart of the detection method of the present invention.

[0021] In the diagram: 1. Controller; 2. Air pressure sensor; 3. Ambient temperature sensor; 4. Mechanical door switch; 5. Internal temperature sensor. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-2As shown, this invention discloses a sealing detection device for a refrigerated display case, including a mechanically activated door switch 4 for monitoring door opening and closing, a pressure sensor 2 for monitoring internal gas pressure, an internal temperature sensor 5, an ambient temperature sensor 3, and a controller 1. The mechanically activated door switch 4 is installed above the refrigerated display case, parallel to the upper edge of the refrigerated display case door, and is used to monitor the opening and closing of the door. When the door sags, the controller cannot detect a valid on / off signal through the mechanically activated door switch. If the door remains open for a long time, it is marked as an abnormality, and the temperature controller sends a signal to the cloud platform to report to after-sales service in a timely manner. The mechanically activated door switch 4 can also be used for data collection, which can collect the number of times the display case is opened and closed in real time and upload the data to the cloud platform by the controller. The pressure sensor 2, internal temperature sensor 5, ambient temperature sensor 3, and controller 1 are all installed in the upper control box of the refrigerated display case. The mechanically activated door switch 4, pressure sensor 2, internal temperature sensor 5, and ambient temperature sensor 3 are all electrically connected to the controller 1, and the controller is communicatively connected to the cloud platform.

[0024] Under normal operating conditions, the mechanically activated door switch can be triggered when the cabinet door is closed, and the intelligent thermostat can effectively receive the trigger information from the door switch. When the door sags or the cabinet deforms, the distance between the door and the door switch on the lower side of the light box increases. At this time, the upper edge of the door can no longer touch the door switch when opening or closing the door, and the door switch cannot be effectively activated.

[0025] like Figure 3 As shown, the present invention also discloses a detection method based on a sealing degree detection device for refrigerated display cases, comprising the following steps:

[0026] Step 1: Mechanically activate the door switch to detect the opening and closing status of the refrigerator door;

[0027] Step 2: If the mechanical door switch does not detect the refrigerator door closing signal and after a time delay of t1, the controller detects that the door is always open and cannot receive effective trigger information for door opening / closing changes, the mechanical door switch sends a signal to the controller, and the controller sends a signal to the cloud platform, which determines that the door has sunk or the cabinet has deformed. After-sales technicians can then perform after-sales repairs based on the information provided by the cloud platform.

[0028] Step 3: After the mechanically activated door switch detects that the refrigerator door is closed, the internal temperature and air pressure are determined by the internal temperature sensor and air pressure sensor. If both the temperature and air pressure results meet the set requirements, the refrigerator display cabinet is normal. If either the temperature or air pressure result does not meet the set requirements, the controller sends a signal to the cloud platform to determine that the refrigerator door sealing strip does not meet the usage requirements.

[0029] The specific process for determining the temperature and air pressure inside the chamber in step 3 is as follows:

[0030] Step 3.1: The mechanical touch door switch detects that the refrigerator door is closed and starts timing. After the set time t2 is reached, the internal temperature sensor detects whether the internal temperature has reached the set temperature.

[0031] Step 3.2: If the set temperature is reached, the air pressure sensor detects the air pressure inside the cabinet and compares the measured air pressure with the air pressure threshold. If the measured air pressure is within the air pressure threshold, the refrigerated display cabinet is normal. If it is higher than the air pressure threshold, the controller sends a signal to the cloud platform to determine that the refrigerated cabinet door seal is aging.

[0032] Step 3.3: If the set temperature is not reached, the internal temperature of the refrigerator will be measured again after time t2+b. If the set temperature is still not reached, the controller will send a signal to the cloud platform to determine that the door sealing strip of the refrigerator does not meet the requirements. If the set temperature is reached, step 3.2 will be repeated.

[0033] Specifically, the setting process for the set time t2 is as follows: Before the refrigerated display case leaves the factory, it needs to be tested in the laboratory. During the laboratory testing phase, the time required to reach different set temperatures under different ambient temperatures is tested and written into the controller in advance. When the refrigerated display case is working, the ambient temperature sensor first detects the ambient temperature and sends a signal to the controller. The controller activates the time required to reach the set temperature of the refrigerated display case under that ambient temperature as the set time t2.

[0034] Step 3.2 involves setting the air pressure threshold as follows: Based on the Clapeyron equation for gases, PV = nRT; where P represents pressure, V represents gas volume, n represents amount of substance, R represents gas constant, and T represents temperature, R is a constant. For a sealed, fixed-volume refrigerated display case V, meaning the gas volume and n are fixed, the air pressure is primarily affected by temperature. For a fixed-volume display case with a gas volume of V0, the air pressure P0 at the set temperature T0 can be obtained using the Clapeyron equation. Using P0 as a reference value, and to prevent false alarms due to measurement errors, P0 ± 15% is used as the air pressure threshold P. t When the set temperature T changes, the controller can adjust the air pressure threshold corresponding to different set temperatures. For different product models, the main difference is the fixed volume V. t And set the temperature T. Correspondingly, different models of products can adjust the air pressure threshold according to the rules.

[0035] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A sealing test device for a refrigerated display case, characterized in that: The system includes a mechanically activated door switch for monitoring door opening and closing, a pressure sensor for monitoring internal gas pressure, an internal temperature sensor, an ambient temperature sensor, and a controller. The mechanically activated door switch is installed above the refrigerated display case, parallel to the upper edge of the refrigerated display case door. The mechanically activated door switch, pressure sensor, internal temperature sensor, and ambient temperature sensor are all electrically connected to the controller, which is communicatively connected to a cloud platform. The detection method based on the above-mentioned sealing test device for a refrigerated display case includes the following steps: Step 1: Mechanically activate the door switch to detect the opening and closing status of the refrigerator door; Step 2: When the mechanical door switch cannot detect the refrigerator door closing signal, the mechanical door switch sends a signal to the controller, and the controller sends a signal to the cloud platform to determine that the door has sunk or the refrigerator body has deformed. Step 3: After the mechanical touch door switch detects that the refrigerator door is closed, the internal temperature and air pressure are determined by the internal temperature sensor and air pressure sensor. If the temperature and air pressure determination results meet the set requirements, the refrigerator display cabinet is normal. If either the temperature or air pressure determination result does not meet the set requirements, the controller sends a signal to the cloud platform to determine that the refrigerator door sealing strip does not meet the usage requirements. In step 2, "the mechanical door switch cannot detect the refrigerator door closing signal" means that the mechanical door switch does not detect the refrigerator door closing signal, and no closing signal is detected after time t1. The specific process for determining the temperature and air pressure inside the chamber in step 3 is as follows: Step 3.1: The mechanical touch door switch detects that the refrigerator door is closed and starts timing. After the set time t2 is reached, the internal temperature sensor detects whether the internal temperature has reached the set temperature. Step 3.2: If the set temperature is reached, the air pressure sensor detects the air pressure inside the cabinet and compares the measured air pressure with the air pressure threshold. If the measured air pressure is within the air pressure threshold, the refrigerated display cabinet is normal. If it is higher than the air pressure threshold, the controller sends a signal to the cloud platform to determine that the refrigerated cabinet door seal is aging. Step 3.3: If the set temperature is not reached, the temperature inside the refrigerator will be measured again after time t2+b. If the set temperature is still not reached, the controller will send a signal to the cloud platform to determine that the door sealing strip of the refrigerator does not meet the requirements. If the set temperature is reached, step 3.2 will be repeated. The specific process of setting the air pressure threshold in step 3.2 includes: according to the Clapeyron equation for gas PV=nRT, where P represents pressure, V represents gas volume (i.e., the volume of the refrigerated display case), n represents the amount of substance, R represents the gas constant, and T represents temperature, the air pressure value P0 of the refrigerated display case at the set temperature is calculated, and P0±15% is used as the air pressure threshold. The specific setting process for the set time t2 is as follows: Before the refrigerated display case leaves the factory, it undergoes testing in the laboratory. During the laboratory testing phase, the time required to reach different set temperatures under different ambient temperatures is tested and written into the controller in advance. When the refrigerated display case is working, the ambient temperature sensor first detects the ambient temperature and sends a signal to the controller. The controller activates the time required to reach the set temperature of the refrigerated display case under that ambient temperature as the set time t2.

2. The sealing degree detection device for a refrigerated display case according to claim 1, characterized in that, The air pressure sensor, the internal temperature sensor, the ambient temperature sensor, and the controller are all installed in the control box at the top of the refrigerated display case.

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