CN-122004630-A - Module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device and system

CN122004630ACN 122004630 ACN122004630 ACN 122004630ACN-122004630-A

Abstract

The invention belongs to the technical field of refrigeration equipment, and particularly relates to a module butt-joint self-sealing energy-saving supermarket refrigeration display cabinet device and a system, wherein a double-objective optimization function is constructed by reasonably calculating the instantaneous energy efficiency ratio and the system comprehensive energy efficiency ratio of each display cabinet device, meanwhile, the system comprehensive energy efficiency ratio and the temperature deviation root mean square in a cabinet are brought in, the overall optimization scheduling of the frequency of each display cabinet unit compressor and the power of the centralized refrigeration unit can be realized by dynamically adjusting the frequency of each display cabinet unit compressor and the power of the centralized refrigeration unit through gradient descent iteration, the contradiction of difficult energy saving and accurate temperature control is solved, and in the gradient descent iteration process, if the continuous objective function is not descended twice, the gradient descent learning rate is automatically attenuated to be 0.8 times of an original value and a lower limit is set, so that parameter oscillation divergence can be avoided, optimization is prevented from being sunk into local stagnation, and rolling optimization in a period of 5 minutes can be reliably converged in a full working condition range.

Inventors

WANG YIXIN
CHENG TAIJIE
LIU HUAZENG
YUAN FANGMING
Luan Guanglei

Assignees

鲲鹏智慧冷链(山东)有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (9)

1. The module butt joint self-sealing energy-saving supermarket refrigeration showcase device comprises a cabinet body, a drawer type modularized refrigeration unit, a self-sealing butt joint assembly and an intelligent control system, and is characterized in that a drawer type installation cavity is arranged on the side wall of the cabinet body, a self-sealing butt joint seat is arranged on the inner side of the drawer type installation cavity, and the self-sealing butt joint seat comprises a refrigerant interface, an electrical interface and an air flow interface; The drawer type modularized refrigerating unit comprises a variable frequency compressor, a micro-channel evaporator, a condenser, an electronic expansion valve and a butt flange, and a sealing structure is arranged on the periphery of the butt flange; The self-sealing butt joint assembly comprises a butt joint driving mechanism, a sealing efficiency monitoring module and an automatic locking mechanism; The intelligent control system comprises a main controller, a temperature sensor in the cabinet, a door state monitoring module, an environment temperature and humidity sensor, a sealing pressure sensor and an alarm module; After the drawer type modularized refrigerating unit is inserted into the drawer type mounting cavity in place, the self-sealing butt joint assembly automatically completes sealing butt joint, the sealing efficiency monitoring module collects the sealing surface pressing force in real time, and the intelligent control system self-adaptively adjusts the frequency of the compressor and the rotating speed of the fan according to the temperature in the cabinet, the door body state, the sealing parameters and the environmental parameters.
2. The module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device of claim 1, wherein a guide rail and a positioning lug are arranged between the drawer type mounting cavity and the drawer type modularized refrigeration unit and used for accurate alignment during insertion so as to ensure that the sealing surfaces are uniformly attached.
3. The module docking self-sealing energy-saving supermarket refrigeration showcase device of claim 2, wherein the sealing efficiency monitoring module comprises a film pressure sensor and a temperature sensor, and is used for collecting sealing surface compression force distribution value Fs and sealing surface temperature in real time, and the main controller compares the sealing surface compression force distribution value Fs with a preset sealing compression force threshold Fmin and comprehensively judges whether the sealing is invalid by combining a sealing surface and a temperature difference value in the cabinet.
4. The module docking self-sealing energy-saving supermarket refrigeration showcase device of claim 3, wherein the door state monitoring module comprises a magnetic spring switch and a permanent magnet and is used for detecting the opening and closing state and the opening duration of a cabinet door, and when the door is opened, the air curtain is reinforced to reduce the loss of cold energy.
5. The modular self-sealing energy-saving supermarket refrigeration display cabinet device of claim 4, wherein a dust-proof sealing door is arranged at the front side of the drawer type mounting cavity, and the dust-proof sealing door is automatically closed when the drawer type modular refrigeration unit is pulled out, so that hot air invasion is reduced.
6. The module docking self-sealing energy-saving supermarket refrigeration showcase system comprises a plurality of showcase devices as claimed in any one of claims 1 to 5, and is characterized by further comprising a centralized refrigeration unit, a partition control valve group, a central monitoring platform, a communication module, a load prediction module and an energy efficiency optimization module; the centralized refrigerating unit is used for providing centralized cold sources for the display cabinet devices, and the running power of the centralized cold sources is regulated through the frequency converter according to the power instruction issued by the energy efficiency optimizing module; The partition control valve group is arranged on a refrigerant output pipeline of the centralized refrigerating unit and is used for adjusting refrigerant flow distribution of each display cabinet device according to the instruction issued by the energy efficiency optimization module; the central monitoring platform is used for receiving the sealing state, temperature and power data of each display cabinet device in real time, carrying out fault diagnosis and grading early warning, and generating operation and maintenance suggestions; The communication module is used for realizing data interaction between the central monitoring platform and the main controller of each display cabinet device and receiving instructions from the load prediction module and the energy efficiency optimization module; the load prediction module is used for predicting the refrigeration load demand value of each display cabinet device in a preset time period in the future according to the historical operation data and the environmental parameters of each display cabinet device, and outputting a prediction result to the energy efficiency optimization module to be used as a feedforward input; The energy efficiency optimization module is used for calculating the energy efficiency ratio of each display cabinet device and the comprehensive energy efficiency ratio of the system, constructing an objective function and adopting a gradient descent algorithm to carry out iterative optimization; The specific optimization steps comprise: Step S1, calculating the instantaneous energy efficiency ratio of each display cabinet device, wherein the calculation formula of the instantaneous energy efficiency ratio is as follows: Wherein Ei is the instantaneous energy efficiency ratio of the ith display cabinet, qi is the refrigerating capacity of the ith display cabinet, For the i-th display case compressor power, The power of the fan of the ith display cabinet; Step S2, calculating the instantaneous comprehensive energy efficiency ratio Esys of the system based on the calculation result of the instantaneous energy efficiency ratio, wherein the calculation formula of the instantaneous comprehensive energy efficiency ratio Esys of the system is as follows: wherein Qcen is the total refrigerating capacity of the centralized refrigerating unit, pcen is the power of the centralized refrigerating unit, and N is the number of display cabinets; S3, constructing a double-objective optimization function J for maximizing the energy efficiency of the system and controlling the temperature, wherein the expression of the double-objective optimization function is as follows: Wherein Emax is the rated energy efficiency ratio under the design working condition of the system, alpha and beta are weight coefficients, ei is the temperature deviation in the i-th display cabinet, and DeltaT is the preset allowable temperature deviation; s4, performing iterative optimization on the double-objective optimization function J by adopting a gradient descent algorithm, and adjusting the frequency of the compressor of each display cabinet device And the power Pcen of the centralized refrigerating unit, the iterative formula is as follows: Wherein eta and mu are gradient decline learning rate, For the ith display case compressor frequency at the kth iteration, For the power of the centralized refrigeration unit at the kth iteration, And (3) with Respectively, double objective optimization function J versus compressor frequency The partial derivative of the centralized refrigerating unit power Pcen is approximately calculated by adopting a finite difference method; Step S5, optimizing the frequency of the compressor And the opening degree of the frequency converter and the partition control valve group of the centralized refrigerating unit is regulated simultaneously by the main controller issued to each display cabinet device.
7. The module docking self-sealing energy-saving supermarket refrigeration showcase system of claim 6, wherein the intelligent control systems of the showcase devices are mutually communicated through a CAN bus or a wireless network to form a distributed cooperative control network and execute a cooperative load balancing strategy; the collaborative load balancing strategy comprises that each display cabinet device acquires current refrigeration power and compressor frequency of an adjacent unit in real time, when the fact that the instantaneous total power of the unit and the adjacent unit exceeds a preset threshold value is detected, the unit is started or reduces the compressor frequency in a delayed mode according to a preset priority order, so that the plurality of units are prevented from being in peak load states at the same time, and meanwhile, each display cabinet device reports the running state to a central monitoring platform in real time for global auxiliary scheduling.
8. The module docking self-sealing energy-saving supermarket refrigeration showcase system of claim 6, wherein the load prediction module adopts a long-short-period memory network LSTM model, and the input characteristics comprise relative temperature of each unit at the past M moments, ambient temperature, accumulated door opening duration and timestamp codes, and outputs refrigeration load demand predicted values at the future K moments.
9. The modular docking self-sealing energy-saving supermarket refrigeration showcase system of claim 6, wherein the gradient descent optimization in the step S4 is performed every 5 minutes, the gradient descent learning rate eta and mu are dynamically adjusted according to the system response, if the objective function J is not descended in two successive iterations, the gradient descent learning rate is attenuated by 0.8 times of the original gradient descent learning rate, and the attenuation lower limit is set to be 0.1 times of the initial gradient descent learning rate.

Description

Module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device and system Technical Field The invention belongs to the technical field of refrigeration equipment, and particularly relates to a module docking self-sealing energy-saving supermarket refrigeration display cabinet device and system. Background The utility model provides a supermarket refrigeration show cupboard, as commercial refrigeration plant's core class, wide application is in all kinds of super, the convenience of business, its running stability, maintenance convenience, sealing reliability and energy-conserving nature directly influence super operating efficiency and operation cost, the refrigeration unit of supermarket show cupboard on the present market adopts split type installation mostly, need professional welder to carry out the cutting and the re-welding of refrigerant pipeline during the maintenance, maintenance cycle is long and easily cause the refrigerant to leak, and current show cupboard adopts single temperature feedback's fixed frequency or simple variable frequency control mostly, do not combine the dynamic change of refrigeration load to carry out self-adaptation regulation, and mostly single cabinet independent control lacks the global energy efficiency optimization of system level, do not have the collaborative scheduling mechanism between each show cupboard unit, easily appear partial load overload, problem that whole energy efficiency is lower, can't realize energy-conserving and temperature control precision's collaborative promotion. In order to solve the problems, the application designs the module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device and system. Disclosure of Invention In order to solve the defects in the prior art mentioned in the background art, the application provides a module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device and a system, and double innovation of the device and the system is realized through modular structural design, self-sealing butt joint technology, multi-dimensional monitoring and system level energy efficiency optimization, so that the problems in the background art are solved. In order to achieve the aim, the application provides a module butt joint self-sealing energy-saving supermarket refrigeration display cabinet device, which comprises a cabinet body, a drawer type modularized refrigeration unit, a self-sealing butt joint assembly and an intelligent control system, wherein a drawer type mounting cavity is arranged on the side wall of the cabinet body, a self-sealing butt joint seat is arranged on the inner side of the drawer type mounting cavity, and the self-sealing butt joint seat comprises a refrigerant interface, an electrical interface and an air flow interface; The drawer type modularized refrigerating unit comprises a variable frequency compressor, a micro-channel evaporator, a condenser, an electronic expansion valve and a butt flange, and a sealing structure is arranged on the periphery of the butt flange; The self-sealing butt joint assembly comprises a butt joint driving mechanism, a sealing efficiency monitoring module and an automatic locking mechanism; The intelligent control system comprises a main controller, a temperature sensor in the cabinet, a door state monitoring module, an environment temperature and humidity sensor, a sealing pressure sensor and an alarm module; After the drawer type modularized refrigerating unit is inserted into the drawer type mounting cavity in place, the self-sealing butt joint assembly automatically completes sealing butt joint, the sealing efficiency monitoring module collects the sealing surface pressing force in real time, and the intelligent control system self-adaptively adjusts the frequency of the compressor and the rotating speed of the fan according to the temperature in the cabinet, the door body state, the sealing parameters and the environmental parameters. On the basis of the scheme, the drawer type mounting cavity and the drawer type modularized refrigerating unit are preferably provided with the guide rail and the positioning protruding block, and the guide rail and the positioning protruding block are used for accurate alignment during insertion, so that the sealing surface is uniformly attached. On the basis of the scheme, preferably, the sealing efficiency monitoring module comprises a film pressure sensor and a temperature sensor and is used for collecting the sealing surface compression force distribution value Fs and the sealing surface temperature in real time, and the main controller compares the sealing surface compression force distribution value Fs with a preset sealing compression force threshold Fmin and comprehensively judges whether the sealing is invalid or not by combining the difference value of the sealing surface and the temperature in the cabinet. On the basis of the scheme, the door