Sealing structure of door frame in refrigeration compartment and sealing monitoring method of sealing structure

Abstract

The invention belongs to the technical field of cold chain transportation equipment, and particularly relates to a sealing structure of a door frame in a refrigeration compartment and a sealing monitoring method.The sealing structure structurally comprises a multi-layer intelligent sealing unit, a sensor set and a sealing control module, and the multi-layer intelligent sealing unit is composed of a main sealing layer, an auxiliary sealing layer and an emergency sealing layer; an inflatable sealing strip, a memory alloy sealing piece and an expandable sealing rubber strip are adopted to achieve graded sealing and self-adaptive adjustment, the sensor set comprises a pressure sensor, a humidity sensor, a temperature sensor and an image sensor and collects sealing state data in real time, and the sealing control module calculates a sealing performance index SPI based on a multi-sensor fusion algorithm and judges the sealing state according to the SPI value. And corresponding sealing adjustment actions such as air pressure adjustment, memory alloy activation or emergency sealant injection are automatically executed. Real-time monitoring, intelligent evaluation and active maintenance of the sealing state are achieved, the sealing reliability and adaptability are remarkably improved, and the service life is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of cold chain transportation equipment technology, and in particular to a sealing structure for the door frame of a refrigerated compartment and a method for monitoring its sealing. Background Technology

[0002] During cold chain transportation, the sealing performance of refrigerated compartments directly affects the quality of transported goods and energy consumption efficiency. Currently, conventional refrigerated compartment door frame seals mostly use a single polyurethane sealant application structure, which has several technical shortcomings:

[0003] First, single polyurethane adhesive is easily corroded by solutions during use, leading to seal failure; second, the sealant is easily worn away during the loading and unloading of goods on vehicles.

[0004] Furthermore, some water transport products can cause the sealant to become soaked in water, leading to water leakage from the cargo box.

[0005] Traditional sealing structures lack real-time monitoring and intelligent adjustment capabilities, and cannot meet the sealing requirements of complex transportation environments. Therefore, a sealing structure for the door frame of a refrigerated compartment and its sealing monitoring method are proposed to address this problem. Summary of the Invention

[0006] Based on the technical problems existing in the prior art, this invention proposes a sealing structure for the door frame of a refrigerated compartment and a method for monitoring its sealing.

[0007] This invention proposes a sealing structure for the door frame of a refrigerated compartment and a sealing monitoring method thereof, comprising a door frame and a door leaf, and further comprising a multi-layer intelligent sealing unit disposed in the sealing groove of the door frame, a sensor group for monitoring the sealing status, and a sealing control module for data processing; the sensor group includes a pressure sensor, a humidity sensor, a temperature sensor, and an image sensor; the sealing control module receives data from the sensor group, evaluates the sealing status in real time, and controls the sealing unit to perform corresponding actions based on the evaluation results.

[0008] Preferably, the multi-layer intelligent sealing unit includes a main sealing layer, an auxiliary sealing layer, and an emergency sealing layer; the main sealing layer is an elastic inflatable sealing strip, the auxiliary sealing layer is a shape memory alloy sealing sheet, and the emergency sealing layer is an expandable sealing strip.

[0009] Preferably, a miniature air pressure regulator is embedded in the main sealing layer. The air pressure regulator is connected to the sealing control module and adjusts the internal air pressure of the sealing strip in real time according to sensor data.

[0010] Preferably, the pressure sensors are evenly arranged at the bottom of the sealing groove to monitor the contact pressure between the sealing strip and the door leaf; the humidity sensor is arranged inside the sealing groove to detect water leakage; the temperature sensor is arranged around the middle door frame to monitor deformation caused by temperature difference; and the image sensor is arranged above the middle door frame to visually detect the integrity and wear of the sealing strip.

[0011] Preferably, the sealing control module includes a data acquisition unit, a status evaluation unit, and an execution control unit; the data acquisition unit is used to collect real-time data from each sensor; the status evaluation unit calculates sealing performance indicators based on a preset algorithm; and the execution control unit controls the sealing unit to operate according to the evaluation results.

[0012] Preferably, the status assessment unit adopts a multi-sensor data fusion algorithm to integrate pressure, humidity, temperature and image data, and outputs a sealing status level, which includes: normal, warning and abnormal.

[0013] This invention also provides a method for monitoring the sealing structure of a door frame in a refrigerated compartment, comprising the following steps:

[0014] Step S1: Real-time acquisition of pressure, humidity, temperature and image data inside the sealing groove;

[0015] Step S2: Calculate the sealing performance index SPI based on the collected data. The formula for calculating the sealing performance index SPI is as follows:

[0016]

[0017] Where P is the measured pressure, P0 is the rated pressure, H is the measured humidity, Hmax is the humidity threshold, and T 稳定 To set the temperature difference, T 实际 For the measured temperature difference, I 完整 Image integrity is scored, where α, β, γ, and δ are weighting coefficients;

[0018] Step S3: Determine if the SPI is lower than the set threshold. If yes, proceed to step S4; otherwise, return to step S1.

[0019] Step S4: Activate auxiliary sealing or emergency sealing measures and issue a maintenance alarm. The auxiliary sealing measures include adjusting the air pressure of the main sealing layer and activating the shape memory alloy sealing sheet. The emergency sealing measures include injecting expandable sealant.

[0020] Step S5: Record the location and time of the anomaly, and generate a maintenance report.

[0021] Compared with the prior art, the present invention provides a sealing structure for the door frame of a refrigerated compartment and a sealing monitoring method thereof, which has the following beneficial effects:

[0022] 1. This invention adopts a multi-layer intelligent sealing unit design, combining inflatable sealing strips, shape memory alloy sealing sheets, and expandable sealing strips to form a graded and dynamic sealing mechanism. The main sealing layer adapts to changes in door pressure in real time through air pressure regulation; the auxiliary sealing layer automatically adjusts its shape based on temperature changes to enhance fit; the emergency sealing layer quickly activates when severe water leakage or sealing failure is detected, forming a secondary sealing barrier. Compared with traditional single polyurethane sealing structures, this system can effectively resist corrosion, wear, and water immersion, significantly improving sealing reliability in complex transportation environments, extending the service life of the overall sealing structure, and reducing the risk of cargo deterioration and energy loss due to sealing failure.

[0023] 2. The system integrates multiple sensors and intelligent control modules to achieve comprehensive, real-time monitoring of the sealing status. Pressure sensors monitor the sealing contact pressure, humidity sensors detect the risk of water leakage, temperature sensors identify temperature difference deformation, and image sensors capture surface damage to the sealing strip. The control module uses a data fusion algorithm to calculate the sealing performance index (SPI) in real time and automatically determine the status level based on thresholds, triggering corresponding adjustment measures. This system transforms passive maintenance into proactive monitoring, issuing early warnings at the initial stage of sealing performance degradation and automatically executing adjustment actions, significantly reducing the frequency of manual inspections and maintenance costs, and ensuring the safety and stability of the cold chain transportation process.

[0024] 3. This invention integrates a wireless communication module, which can upload real-time sealing status data, early warning information, and maintenance records to a cloud platform. Operators can remotely monitor the sealing health status of multiple refrigerated compartments through the platform, and view sensor data, SPI curves, and anomaly reports in real time. The system supports historical data backtracking and trend analysis, providing a basis for predictive maintenance decisions. This function not only enables full traceability management of the transportation process, but also optimizes maintenance plans, reduces the rate of sudden failures, and improves the overall operational efficiency and management intelligence level of the fleet. It is suitable for the continuous needs of modern logistics enterprises for high reliability and low-cost operation and maintenance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the sealing structure of the door frame in a refrigerated compartment when closed, as proposed in this invention.

[0026] Figure 2 This is a schematic diagram of the sealing structure of the door frame in a refrigerated compartment when it is separated, as proposed in this invention.

[0027] Figure 3 This is a cross-sectional view of the middle door frame of a sealing structure for a refrigerated compartment door frame proposed in this invention;

[0028] Figure 4 This is a cross-sectional view of a multi-layer intelligent sealing unit for a door frame sealing structure in a refrigerated compartment, as proposed in this invention.

[0029] Figure 5 This is a structural block diagram of the sealing control module of the present invention;

[0030] Figure 6 This is a flowchart of the sealing monitoring method of the present invention.

[0031] In the diagram: 101, middle door frame; 102, door leaf; 103, sealing groove; 200, multi-layer intelligent sealing unit; 201, main sealing layer; 202, auxiliary sealing layer; 203, emergency sealing layer; 300, sealing control module; 301, data acquisition unit; 302, status assessment unit; 303, execution control unit; 400, sensor group; 401, pressure sensor; 402, humidity sensor; 403, temperature sensor; 404, image sensor. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1, such as Figures 1 to 5 As shown, this embodiment provides a sealing structure for the door frame of a refrigerated compartment, including a middle door frame 101 and a door leaf 102. The middle door frame 101 is installed on the refrigerated compartment body. A sealing groove 103 is provided on the inner side of the middle door frame 101. A multi-layer intelligent sealing unit 200 is installed in the sealing groove 103. The multi-layer intelligent sealing unit 200 includes a main sealing layer 201, an auxiliary sealing layer 202 and an emergency sealing layer 203 from top to bottom.

[0035] The main sealing layer 201 is an elastic inflatable sealing strip with a micro air pressure regulator inside. It can adjust the internal air pressure according to the instructions of the sealing control module 300 to adapt to the pressure changes of the door leaf 102. The auxiliary sealing layer 202 is a shape memory alloy sealing sheet, which can automatically adjust its shape when the temperature changes to enhance the sealing fit. The emergency sealing layer 203 is an expandable sealing strip. When serious water leakage or sealing failure is detected, the sealing control module 300 triggers the injection system to inject sealant to achieve rapid emergency sealing.

[0036] The sensor group 400 includes: a pressure sensor 401, which is evenly arranged at the bottom of the sealing groove 103 to monitor the contact pressure between the sealing strip and the door leaf 102; a humidity sensor 402, which is arranged at the inner edge of the sealing groove 103 to detect whether water seepage occurs; a temperature sensor 403, which is arranged around the door frame 101 to monitor structural deformation caused by temperature difference; and an image sensor 404, which is installed above the door frame 101 to perform visual inspection on the surface of the sealing strip and identify wear, cracks or foreign objects.

[0037] The sealing control module 300 includes a data acquisition unit 301, a status evaluation unit 302, and an execution control unit 303. The data acquisition unit 301 receives data from each sensor in real time. The status evaluation unit 302 calculates the sealing performance index SPI based on a multi-sensor data fusion algorithm. The execution control unit 303 controls the sealing unit to operate according to the SPI value.

[0038] It should be noted that the above-described injection system is an integrated and modular microfluidic control system, including but not limited to the layout design adopted in this embodiment. The injection system in this embodiment mainly consists of the following parts:

[0039] Sealant storage and delivery unit:

[0040] Glue cartridge / capsule: Pre-sealed, single-use sealant capsules are used, containing a single-component moisture-curing polyurethane sealant (or a similar fast-expanding sealant). These capsules rapidly foam and cure upon contact with air. The capsules are installed in a dedicated slot inside the sealing groove 103 for easy replacement. Miniature plunger pump / extrusion mechanism: Connected to the capsule outlet, driven by a miniature stepper motor or piezoelectric ceramic, its function is to extrude the sealant with precisely controlled pressure and flow rate. Delivery line: Short, straight, corrosion-resistant, flexible Teflon tubing connects the pump outlet and the nozzle.

[0041] Dispensing and Injection Unit:

[0042] Miniature solenoid valve: Installed on the delivery pipeline, it controls the flow of sealant and remains closed when not inactive to prevent sealant leakage or premature curing; Injection nozzle / dispensing head: Located at the reserved injection hole of the emergency sealing layer 203, the nozzle is designed with anti-backflow and anti-clogging structure, and its outlet shape ensures that the sealant is evenly applied in strips to the gaps that need to be sealed.

[0043] Drive and control unit:

[0044] Miniature actuator: provides power to the plunger pump and receives instructions (such as pulse signals) from the execution control unit 303 in the sealing control module 300 to perform precise actions; Local control circuit: integrated near the sealing groove 103, responsible for receiving instructions from the main control module and driving the motor and solenoid valve.

[0045] Example 2, as Figure 6 shown, the seal monitoring method of this embodiment includes the following steps: Data acquisition: Real-time acquisition of pressure, humidity, temperature, and image data; Status assessment: Calculate the seal performance index SPI; Threshold judgment: If SPI ≥ SPI_th (set threshold), it is determined to be in a normal state and continue monitoring. If SPI < SPI_th, it is determined to be in an abnormal state and enter the adjustment process; Seal adjustment: If it is slightly abnormal (SPI_th > SPI ≥ 0.8×SPI_th), adjust the air pressure of the main seal layer 201; If it is moderately abnormal (0.8×SPI_th > SPI ≥ 0.6×SPI_th), start the auxiliary seal layer 202; If it is severely abnormal (SPI < 0.6×SPI_th), start the emergency seal layer 203 and issue an alarm; Data upload and report generation: Upload the abnormal data to the cloud platform through the wireless communication module and generate a maintenance report.

[0046] Formula for calculating the seal performance index SPI:

[0047]

[0048] where, P: Measured average pressure, P0: Rated pressure, H: Measured humidity, Hmax: Humidity threshold (such as 85%), T 稳定 : Set allowable temperature difference (such as 5°C), T 实际 : Measured maximum temperature difference, I 完整 : Image integrity score (0 - 1), based on the image sensor 404 to identify the integrity of the seal strip surface, α, β, γ, δ are weight coefficients, satisfying α + β + γ + δ = 1. In this embodiment, α = 0.4, β = 0.2, γ = 0.2, δ = 0.2.

[0049] One application example of the present invention is listed. Taking a 12-meter refrigerated transport compartment as an example, set SPI_th = 0.85. During transportation, the system continuously monitors the following data:

[0050] Pressure sensor 401: P = 95%P0;

[0051] Humidity sensor 402: H = 70%;

[0052] Temperature sensor 403: T 实际 = 6°C, T 稳定 = 5°C;

[0053] Image sensor 404: I 完整 = 0.9;

[0054] The calculated SPI is: 0.4×0.95+0.2×(1−0.7)+0.2×(5 / 6)+0.2×0.9≈0.38+0.06+0.167+0.18=0.787. Since SPI<0.85, the system is judged to be in an abnormal state, and further judged to be a moderate abnormality (SPI≥0.6). The execution control unit 303 starts the auxiliary sealing layer 202, the shape memory alloy sealing sheet is activated, and the sealing fit is enhanced. At the same time, the system issues an early warning prompt and uploads the abnormality record to the cloud platform.

[0055] In addition, such as Figure 5 As shown, based on the above structure, a cloud platform monitoring system is further integrated. The sealing control module 300 uploads real-time data to the cloud platform via a wireless communication module. The platform can achieve the following:

[0056] Real-time display of sensor data and SPI curves;

[0057] Automatically generate a seal health report;

[0058] Supports historical data query and trend analysis;

[0059] Provides maintenance suggestions and early warning notifications.

[0060] This invention provides an intelligent door frame sealing structure and its monitoring method in a refrigerated compartment. Through real-time monitoring by sensors, intelligent judgment by the sealing control module 300, and linkage adjustment by the multi-layer sealing unit 200, the sealing performance and transportation safety are significantly improved, making it suitable for various cold chain transportation scenarios.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sealing structure for a door frame in a refrigerated compartment, comprising a middle door frame (101) and a door leaf (102), characterized in that: It also includes a multi-layer intelligent sealing unit (200) disposed in the sealing groove (103) of the middle door frame (101), a sensor group (400) for monitoring the sealing status, and a sealing control module (300) for data processing; the sensor group (400) includes a pressure sensor (401), a humidity sensor (402), a temperature sensor (403) and an image sensor (404); the sealing control module (300) receives data from the sensor group (400), evaluates the sealing status in real time, and controls the sealing unit to perform corresponding actions according to the evaluation results.

2. The sealing structure of the door frame in the refrigerated compartment according to claim 1, characterized in that: The multi-layer intelligent sealing unit (200) includes a main sealing layer (201), an auxiliary sealing layer (202), and an emergency sealing layer (203); the main sealing layer (201) is an elastic inflatable sealing strip, the auxiliary sealing layer (202) is a shape memory alloy sealing sheet, and the emergency sealing layer (203) is an expandable sealing strip.

3. The sealing structure of the door frame in the refrigerated compartment according to claim 2, characterized in that: The main sealing layer (201) is embedded with a micro air pressure regulator, which is connected to the sealing control module (300) and adjusts the internal air pressure of the sealing strip in real time according to sensor data.

4. The sealing structure of the door frame in the refrigerated compartment according to claim 1, characterized in that: The pressure sensor (401) is evenly arranged at the bottom of the sealing groove (103) to monitor the contact pressure between the sealing strip and the door leaf (102); the humidity sensor (402) is arranged inside the sealing groove (103) to detect water leakage; the temperature sensor (403) is arranged around the middle door frame (101) to monitor the deformation caused by temperature difference; and the image sensor (404) is arranged above the middle door frame (101) to visually detect the integrity and wear of the sealing strip.

5. The sealing structure of the door frame in a refrigerated compartment according to claim 1, characterized in that: The sealing control module (300) includes a data acquisition unit (301), a status evaluation unit (302), and an execution control unit (303); the data acquisition unit (301) is used to collect real-time data from each sensor; the status evaluation unit (302) calculates sealing performance indicators based on a preset algorithm; and the execution control unit (303) controls the sealing unit to operate according to the evaluation results.

6. The sealing structure of the door frame in a refrigerated compartment according to claim 5, characterized in that: The status assessment unit (302) adopts a multi-sensor data fusion algorithm to integrate pressure, humidity, temperature and image data, and outputs a sealing status level, which includes: normal, warning and abnormal.

7. A method for monitoring the sealing structure of a door frame in a refrigerated compartment, characterized in that, Includes the following steps: Step S1: Real-time acquisition of pressure, humidity, temperature and image data inside the sealing groove (103); Step S2: Calculate the sealing performance index SPI based on the collected data; Step S3: Determine if the SPI is lower than the set threshold. If yes, proceed to step S4; otherwise, return to step S1. Step S4: Activate auxiliary sealing or emergency sealing measures and issue a maintenance alarm; Step S5: Record the location and time of the anomaly, and generate a maintenance report.

8. The sealing monitoring method for the sealing structure of the door frame in a refrigerated compartment according to claim 7, characterized in that: The formula for calculating the sealing performance index SPI is as follows: Where P is the measured pressure, P0 is the rated pressure, H is the measured humidity, Hmax is the humidity threshold, and T 稳定 To set the temperature difference, T 实际 For the measured temperature difference, I 完整 Image integrity is scored, with α, β, γ, and δ being weighting coefficients.

9. The sealing monitoring method for the sealing structure of the door frame in a refrigerated compartment according to claim 7, characterized in that: The auxiliary sealing measures include adjusting the air pressure of the main sealing layer (201) and activating the shape memory alloy sealing sheet; the emergency sealing measures include injecting expandable sealant.

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