CN110926094B - Negative pressure type automatic defrosting system and method thereof - Google Patents
Negative pressure type automatic defrosting system and method thereof Download PDFInfo
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- CN110926094B CN110926094B CN201911249110.0A CN201911249110A CN110926094B CN 110926094 B CN110926094 B CN 110926094B CN 201911249110 A CN201911249110 A CN 201911249110A CN 110926094 B CN110926094 B CN 110926094B
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- 238000010257 thawing Methods 0.000 title claims abstract description 515
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 59
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- 238000004364 calculation method Methods 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000003111 delayed effect Effects 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 13
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- 239000002344 surface layer Substances 0.000 claims description 9
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- 238000010276 construction Methods 0.000 claims description 5
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- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
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- 238000001704 evaporation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 239000003507 refrigerant Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/008—Defroster control by timer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/008—Alarm devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/36—Visual displays
- F25D2400/361—Interactive visual displays
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Abstract
The invention belongs to the technical field of automatic defrosting equipment of a refrigeration house, and relates to a negative pressure type automatic defrosting system and a method thereof; the system comprises a controller, a compressor, an air supply type evaporator, an air pressure sensor, a defrosting device and a temperature sensor, wherein the air supply type evaporator comprises an air pressure sensor, an evaporator coil, a shell, fans and a fixed block; the system can intelligently detect the frosting amount of the evaporator, automatically determine the optimal defrosting time, achieve the energy-saving purpose of optimizing the refrigeration house resources, and simultaneously determine the termination of defrosting operation according to the temperature variation or the set defrosting time, thereby improving the quality of stored materials and reducing the loss rate.
Description
The technical field is as follows:
the invention belongs to the technical field of automatic defrosting equipment of a refrigeration house, and relates to a refrigeration house defrosting system and a method for determining the frosting rate of the refrigeration house by using negative pressure so as to realize automatic defrosting, in particular to a negative pressure type automatic defrosting system and a method thereof.
Background art:
with the rapid development of the field of refrigeration equipment, the automation of a refrigeration system of a refrigeration house becomes a necessary function for the production management of the refrigeration house at present, the realization of the automation effectively increases the safety, the reliability and the energy saving performance of the operation of the refrigeration system of the refrigeration house, and ensures the good quality of the refrigerated objects; however, the surface of the evaporator in the refrigeration house is frosted, so that the conduction and the emission of the cold energy of the refrigeration evaporator (pipeline) are hindered, and the refrigeration effect is finally influenced. When the thickness of the frost layer (ice layer) on the surface of the evaporator reaches a certain degree, the refrigeration efficiency even drops below 30%, resulting in a large waste of electric energy and a shortened service life of the refrigeration system. It is necessary to perform the refrigerator defrosting operation in an appropriate cycle.
In the prior art, chinese patent publication No. CN106051216A discloses a three-way defrosting valve for a refrigerator and a refrigerator defrosting system, wherein the defrosting valve includes a main valve, a pilot valve, and an electromagnetic coil, the electromagnetic coil is disposed on the right side of the pilot valve, and the main valve is connected to the pilot valve through a capillary tube; the main valve comprises a main valve body, a group of air pipes on the main valve body, a main valve seat, a main valve block and a piston fixed at each of two ends of the valve block; the right end of a sliding block in the pilot valve is connected with the pilot valve through a compression spring, the defrosting system comprises all evaporation discharge pipes, a three-way defrosting valve, a gas-liquid separator, a compressor, a condenser, a liquid storage tank, an electromagnetic valve and an expansion valve which are sequentially connected through pipelines and form a closed loop pipeline, and the three-way defrosting valve controls a refrigerant to flow from the evaporation discharge pipes to the compressor for normal refrigeration or flow from the compressor to the evaporation discharge pipes for heating and defrosting; chinese patent publication No. CN207702814U discloses a defrosting control system for a refrigerator, which includes: the device comprises a temperature detection module, a flow velocity detection module and a current and voltage detection module; the processing module is used for calculating the initial heat exchange quantity Q0 of the indoor evaporator according to the inlet and outlet temperature of the indoor evaporator detected by the temperature detection module; calculating the actual heat exchange quantity Q1 of the indoor evaporator according to the inlet and outlet temperature of the outdoor condenser, the flow rate obtained by the flow rate detection module, and the input voltage and the input current detected by the current and voltage detection module; and the judging module is used for controlling the refrigeration house to defrost when the actual heat exchange quantity Q1 of the indoor evaporator is smaller than the initial heat exchange quantity Q0.
At present, the energy-saving research and related equipment of the refrigeration house mostly achieve the purposes of saving energy and reducing consumption by preserving heat and improving heat exchange efficiency, and the technology of how to intelligently determine the defrosting starting point and the defrosting time and the like is incomplete because unnecessary power consumption is caused by repeated defrosting and refrigeration cannot be fundamentally improved, and the existing automatic defrosting technology is complex and has poor operability.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and designs a negative pressure type automatic defrosting system aiming at the defects of complex structure, imperfect determination technology of the initial point of the equipment defrosting process, high energy consumption of periodic automatic defrosting and the like of the conventional defrosting system.
In order to achieve the purpose, the invention relates to a negative pressure type automatic defrosting system, which comprises a controller, a compressor, an air supply type evaporator, an air pressure sensor, a defrosting device and a temperature sensor, wherein the controller is connected with the compressor; the controller adopts the structure of the existing equipment controller, the controller is arranged outside the refrigeration house, the controller is respectively connected with the compressor, the air supply type evaporator, the air pressure sensor and the temperature sensor in an electrical information mode, the air pressure sensor is fixedly arranged in the shell of the air supply type evaporator, and the air pressure sensor is used for detecting the air pressure value in the air supply type evaporator; the controller is in electrical information connection with the defrosting device, the controller is electrically connected with the power supply, the defrosting device adopts the existing defrosting equipment, and the operation of the whole system is automatically controlled by the controller.
The air supply type evaporator comprises an air pressure sensor, an evaporator coil, a shell, fans and a fixed block, wherein the evaporator coil of the air supply type evaporator is fixed at the open end of the open shell; when the air supply type evaporator operates, the rotation directions of the two fans are opposite, the surface layers of the evaporator coils are not frosted or are low in frosting amount, the air quantity passing through a gap between the evaporator coils is sufficient, the air quantity mainly flows along the direction I which is positive to the fans, the air quantity flowing along the directions II at the two sides of the air pressure sensor is small, the negative pressure at the position where the air pressure sensor is located is small, when the frosting amount at the surface layers of the evaporator coils is large, the gap between the evaporator coils is small, the air quantity passing through the gap between the evaporator coils is insufficient, the air quantity entering the fans from the directions II at the two sides of the air pressure sensor is increased, the negative pressure at the position where the air pressure sensor is located is increased, and the frosting amount at the surface layers of the evaporator coils is positively correlated with the; the frosting amount is calculated through the detected wind pressure according to a conversion formula of the wind pressure and the frosting amount, and when the frosting amount reaches a set value, the negative pressure type automatic defrosting system starts the defrosting device to defrost, so that double optimization of energy conservation and efficiency is achieved.
The controller comprises an interface operation module, a parameter setting module, an automatic operation module, a manual operation module, an alarm module, a statistic module and a prompter; the interface operation module is respectively connected with the parameter setting module, the automatic operation module, the manual operation module, the alarm module and the statistic module through electrical information, the parameter setting module is also connected with the automatic operation module and the alarm module through electrical information, and the alarm module is also respectively connected with the automatic operation module and the manual operation module through electrical information; the prompter adopts the existing sound prompting equipment, and is also electrically connected with the automatic operation module and the alarm module respectively; the statistical module is respectively connected with the automatic operation module and the manual operation module through electric information.
The interface operation module is used for: starting and acquiring information of a parameter setting module, an automatic operation module, a manual operation module, an alarm module and a statistic module, and realizing the control of the controller;
the parameter setting module is used for: logging in a parameter setting interface, setting parameters of an automatic defrosting mode, changing a login password and a management level, and sending the set parameters to an automatic operation module and an alarm module;
the manual operation module is used for: receiving a forced defrosting signal sent by the interface operation module to start the defrosting device, or receiving a defrosting termination signal sent by the interface operation module to stop the defrosting device;
the alarm module is used for: detecting whether the connection of the wind pressure sensor, the temperature sensor and the controller is normal or not, and controlling the prompter to send out a nine-tone prompt sound and send a signal for starting an alarm prompt lamp to the interface operation module when the connection interruption time of the wind pressure sensor, the temperature sensor and the controller exceeds the set interruption time; when the temperature change exceeds a temperature interval value within two hours in the automatic defrosting mode, the temperature rises to be less than a temperature rise value within ten minutes in the defrosting stage or the compressor runs for a set defrosting period time to defrost, the prompting device is controlled to give out nine-tone prompting sound, and an alarm prompting lamp starting signal is sent to the interface operation module;
the statistics module is to: the statistical controller runs records, wherein the records comprise: the starting and stopping date and time of the compressor, the starting and stopping date and time of defrosting, the working timing of the compressor, and the accumulated running time and period data statistics;
the automatic operation module is used for: and receiving an automatic operation signal of the interface operation module, sequentially starting the air supply type evaporator and the compressor, pausing the air supply type evaporator and the compressor when the operation time of the compressor reaches a defrosting period or the defrosting amount reaches the defrosting amount, starting the defrosting device to defrost, and closing the defrosting device and sequentially starting the air supply type evaporator and the compressor when the defrosting time reaches a set value or the temperature of the refrigeration house reaches the defrosting stop temperature.
Furthermore, the interface operation module also comprises a setting key, a recording key, a time display area, a pressure display area, a mixed display area, a manual operation key, an automatic operation key, a stop key, a compressor working lamp, a start key, a close key, a defrosting indicator lamp, an alarm prompt lamp and a reset key which are respectively in electrical information connection with the interface operation module; the setting key is arranged at the upper left corner of the interface operation module, and the parameter setting module is started by using the setting key; a recording key is arranged on the lower side of the setting key, and the counting module is started and the record is checked by using the recording key; a time display area is arranged on the right side of the setting key and the recording key and is used for displaying time in real time; the middle part of the interface operation module is sequentially provided with a pressure display area and a mixed display area, the pressure display area is used for displaying a wind pressure value, and the mixed display area alternately displays the temperature of the refrigeration house, defrosting time and the running time of the compressor; the left side of the lower part of the interface operation module is sequentially provided with a manual operation key, an automatic operation key and a stop key, the manual operation module is started by using the manual operation key, the automatic operation module is started by using the automatic operation key, and the manual operation module or the automatic operation module is closed by using the stop key; the left side of the lower part of the interface operation module is sequentially provided with a compressor working lamp, a starting key, a closing key and a defrosting indicator lamp, wherein the compressor working lamp displays the normal operation of the compressor, the starting key is used for starting the controller, and the closing key is used for closing the controller; a reset key and an alarm prompting lamp are arranged on the right side of the lower part of the interface operation module, the reset key is used for initializing the controller, and the alarm is prompted through the alarm prompting lamp; setting keys, recording keys, manual operation keys, automatic operation keys, stop keys, compressor working lamps, starting keys, closing keys, defrosting indicator lamps, alarm prompt lamps, reset keys or virtual keyboard structures can be adopted.
Furthermore, the parameter setting module comprises a login submodule and a setting interface submodule; the login submodule is used for automatically logging in a parameter setting interface after a password is input, and the password can be set as a four-digit number; the setting interface submodule is used for setting parameters of an automatic defrosting mode, changing a login password and managing levels; the setting interface sub-module comprises an opening unit, a filling unit and an ending unit; the opening unit is used for opening the filling unit; starting a unit or specifically an SET virtual key presented after an interface operation module enters a SET interface; the filling unit is used for setting parameters, login passwords and management levels of the automatic defrosting mode; the finishing unit is used for closing the filling unit, exiting the parameter setting module and sending the set parameters to the automatic operation module and the alarm module; the end unit or the specific end virtual key is presented after the interface operation module enters a set interface; the parameters of the automatic defrosting mode filled in by the filling unit include, but are not limited to a defrosting period, a defrosting air volume setting, a defrosting time, a defrosting stop temperature, a defrosting delay, a time delay after defrosting, an evaporator delay, a compressor delay, a power failure startup delay, a locking setting password, a management level, a sensor interrupt time length, a defrosting amount, a temperature interval value and a temperature rise value.
Furthermore, the automatic operation module comprises an evaporator control submodule, a compressor control submodule, a defrosting judgment starting submodule and a defrosting judgment stopping submodule; each submodule is specifically as follows:
the evaporator control submodule is used for receiving an automatic operation signal of the interface operation module and starting the air supply type evaporator, sending a starting signal to the compressor control submodule after detecting that the air supply type evaporator is started, and pausing the air supply type evaporator after receiving a pause signal sent by the defrosting judgment starting submodule; the evaporator control submodule is respectively connected with the interface operation module, the compressor control submodule, the defrosting judgment starting submodule, the defrosting judgment stopping submodule and the air supply type evaporator through electrical information;
the compressor control submodule is used for: starting a compressor after receiving a starting signal of an evaporator control submodule; when the starting work of the compressor is detected, a signal for starting a working lamp of the compressor is sent to the interface operation module, and an operation signal is sent to the defrosting judgment starting sub-module; the compressor is paused after the pause signal sent by the defrosting judgment submodule is received; the compressor control submodule is respectively connected with the interface operation module, the defrosting judgment starting submodule and the compressor electrical information;
the defrosting judgment submodule is used for: after receiving an operation signal sent by a compressor promoter module, recording the operation time of the compressor and monitoring the frosting amount of the air supply type evaporator; when the running time reaches the defrosting period or the defrosting amount reaches the defrosting amount, ending the running time timing of the compressor, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule;
the defrosting judgment submodule is used for: timing defrosting time, receiving the temperature detected by a temperature sensor, and sending a running stop signal to a defrosting device when the defrosting time reaches a set value or the temperature of the refrigeration house reaches a defrosting stop temperature; after receiving a closing signal fed back by the defrosting device, sending a signal for turning on a defrosting indicator lamp to the interface operation module, and controlling a prompter to give out nine prompt tones; after a closing signal fed back by the defrosting device is received, timing delay time, and controlling the prompter to give out nine prompt tones and send an operation signal to the evaporator control submodule when the delay time reaches a set value; the defrosting judgment submodule is also respectively connected with the interface operation module, the temperature sensor and the evaporator control submodule through electrical information.
Still further, the defrosting judgment and enlightenment sub-module comprises a periodic timing unit and a frosting amount judgment unit; the cycle timing unit is to: recording the running time of the compressor; clearing the running time after receiving a running time timing signal of the compressor ending of the frosting amount judgment unit; when the running time of the compressor reaches the set defrosting cycle time, automatically ending the running time timing of the compressor and resetting, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device to defrost; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule; the period timing unit is electrically connected with the evaporator control submodule, the compressor control submodule, the defrosting device, the frosting amount judging unit and the defrosting judging submodule;
the frosting amount judging unit is used for: receiving a wind pressure value detected by a wind pressure sensor and converting the wind pressure value into frosting amount; when the frosting amount reaches the set defrosting amount, sending a running time timing signal for ending the compressor to the period timing unit, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device to defrost; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule; the frosting amount judging unit is also respectively connected with the evaporator control submodule, the compressor control submodule, the defrosting device and the defrosting judging submodule through electric information.
The automatic defrosting method of the negative pressure type automatic defrosting system comprises the following steps:
(1) starting the controller, inputting a password login parameter setting interface according to a setting key, setting parameters of an automatic defrosting mode, changing a login password and a management level, and sending the set parameters to the automatic operation module;
(2) the controller detects whether the connection of the wind pressure sensor and the temperature sensor with the controller is normal, and when the connection interruption time of the wind pressure sensor and the temperature sensor with the controller exceeds the set interruption time, the controller controls the prompter to send out a nine-tone prompting sound and turn on the alarm prompting lamp;
(3) pressing an automatic operation key to start an automatic defrosting mode; or when the power is on after the power failure condition is over, the controller delays to start the automatic defrosting mode;
(4) after the automatic defrosting mode is started, the air supply type evaporator is started in a delayed mode, and the delay time is set according to production requirements and equipment performance;
(5) after the air supply type evaporator is started, the compressor is started in a delayed mode, and the delay time is set to be 30S;
(6) after the compressor is started, the controller starts to time the running time of the compressor after receiving a running signal fed back by the compressor, and meanwhile, a working lamp of the compressor is turned on;
(7) the controller receives a wind pressure value detected by the wind pressure sensor, calculates the frosting amount of the air supply type evaporator according to a conversion formula of the wind pressure and the frosting amount, suspends the compressor and the air supply type evaporator when the frosting amount reaches a set defrosting amount or the running time of the compressor reaches the defrosting period duration, ends the running time timing of the compressor and starts the defrosting device in a delayed manner; the conversion formula of the wind pressure and the frosting amount is as follows:
Pf＝Pw*k+a
pf is frosting amount, unit%; pw is a negative pressure value (absolute value is taken during calculation), and the unit Pa; a, regulating offset of frosting, wherein the unit is &; k is the proportionality coefficient of pressure/frosting amount, unit%/Pa; each different type of evaporator, a and k, will vary due to the construction, fan, etc.
a and k calculation method:
the calculation method of a is that the fan is started in a frost-free state, the evaporator is gradually shielded by using the shielding plate, the percentage of shielded area (shielded part area/total evaporator area) when the wind pressure begins to change is recorded as a
k, a calculation method: starting the fan in a frost-free state, using a baffle plate to completely shield the evaporator, and recording the current wind pressure Pw (max), k being 100/Pw (max)
(8) When the defrosting device is started, the controller times defrosting time and receives the temperature detected by the temperature sensor, and when the defrosting time reaches a set value or the temperature of the refrigeration house reaches defrosting stop temperature, the defrosting device is closed; meanwhile, the defrosting indicator lamp is turned on, and the prompter gives out nine-tone prompt tones;
(9) after defrosting is finished, the cold storage carries out delayed dripping, and after the delay time is finished, the prompter gives out nine-tone prompting sound and starts the air supply type evaporator;
(10) repeating the steps (2) to (7), and recording the operation data of each step to realize automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed (such as defrosting completely after a refrigeration house is emptied), pressing a stop key to terminate the automatic defrosting mode, then pressing a manual operation key to start the defrosting device, pressing the stop key to close the defrosting device after defrosting is finished, and when pressing the automatic operation key again, starting the automatic defrosting mode; when the controller needs to be initialized, a reset key is pressed to initialize the controller; and when the negative pressure type automatic defrosting system needs to be closed, pressing a closing key to close the negative pressure type automatic defrosting system.
Further, the negative pressure type automatic defrosting system provided by the invention is combined with a specific automatic defrosting method using each module, and the specific automatic defrosting method comprises the following steps:
(1) starting a controller by pressing a start key, entering a parameter setting module by pressing a set key, inputting a four-digit password or an initial password 9999, logging in a parameter setting interface, setting parameters of an automatic defrosting mode, setting a defrosting period to be 48 hours, a defrosting air volume to be 70Kpa, a defrosting time to be 30 minutes, a defrosting stop temperature to be 0 ℃, a defrosting delay to be 1 minute, a defrosting delay to be 5 minutes after defrosting, an evaporator delay to be 1 minute, a compressor delay to be 1 minute, a power failure startup delay to be 1 minute, a sensor interrupt time to be 10 seconds, a frosting amount to be 30%, a temperature interval value to be 4 ℃ and a temperature rise value to be 2 ℃, and sending the set parameters to an automatic operation module;
(2) the alarm module detects whether the connection of the wind pressure sensor and the temperature sensor with the controller is normal or not, when the connection interruption time of the wind pressure sensor and the temperature sensor with the controller exceeds the set interruption time, the control prompter sends out nine-tone prompt sound, the alarm module sends signal lamp starting information to the interface operation module, and the interface operation module starts an alarm prompt lamp;
(3) pressing an automatic operation key to start an automatic operation module to enter an automatic defrosting mode; or when the power is on after the power failure condition is over, the controller delays for 1 minute to start the automatic defrosting mode;
(4) after the automatic defrosting mode is started, the evaporator control submodule delays for 1 minute to start the air supply type evaporator after receiving an automatic operation signal of the interface operation module, and the evaporator control submodule sends a starting signal to the compressor control submodule after the air supply type evaporator is started;
(5) the compressor control submodule delays for 1 minute to start the compressor after receiving a starting signal of the evaporator control submodule; when the compressor control submodule receives an operation signal fed back by the compressor, the compressor control submodule sends a signal for starting a compressor work lamp to the interface operation module, the interface operation module starts the compressor work lamp, and meanwhile the compressor control submodule sends an operation signal to the defrosting judgment starting submodule;
(6) after the compressor works, the alarm module detects that the temperature rises to be more than 4 ℃ within two hours, the alarm module controls the prompter to send out nine-tone prompting sound and sends a signal for starting the alarm prompting lamp to the interface operation module, the alarm prompting lamp is started to alarm and inform a worker, the worker closes the alarm prompting lamp and verifies whether the refrigeration house has a fault or not;
(7) the defrosting judgment starting sub-module starts to record the running time of the compressor, receives a wind pressure value detected by a wind pressure sensor and sends the running time to the interface operation module for display after receiving a running signal sent by the compressor control sub-module, the defrosting judgment starting sub-module calculates the frosting amount of the air supply type evaporator according to a conversion formula of the wind pressure and the frosting amount, and when the frosting amount reaches 30% or the running time of the compressor reaches 48 hours, the defrosting judgment starting sub-module finishes the running time timing of the compressor, sends a pause signal to the evaporator control sub-module and the compressor control sub-module to pause the compressor and the air supply type evaporator, and sends an opening signal to the defrosting device to delay for 1 minute to open the defrosting device; the defrosting judgment starting sub-module sends a starting signal to the defrosting judgment sub-module after receiving the starting signal of the defrosting device; the conversion formula of the wind pressure and the frosting amount is as follows:
Pf＝Pw*k+a
pf is frosting amount, unit%; pw is a negative pressure value (absolute value is taken during calculation), and the unit Pa; a, regulating offset of frosting, wherein the unit is &; k is the proportionality coefficient of pressure/frosting amount, unit%/Pa; each different type of evaporator, a and k, will vary due to the construction, fan, etc.
a and k calculation method:
the calculation method of a is that the fan is started in a frost-free state, the evaporator is gradually shielded by using the shielding plate, the percentage of shielded area (shielded part area/total evaporator area) when the wind pressure begins to change is recorded as a
k, a calculation method: starting the fan in a frost-free state, using a baffle plate to completely shield the evaporator, and recording the current wind pressure Pw (max), k being 100/Pw (max)
(8) After the defrosting judgment sub-module receives a starting signal for starting the defrosting device, the defrosting judgment sub-module starts timing defrosting time, receives the temperature of the refrigeration house detected by the temperature sensor, and sends the detected defrosting time and the detected temperature of the refrigeration house to the interface operation module, the interface operation module displays the defrosting time and the temperature of the refrigeration house, and when the defrosting time reaches 30 minutes or the temperature of the refrigeration house reaches 0 ℃, the defrosting judgment sub-module sends a running stop signal to the defrosting device; after receiving a closing signal fed back by the defrosting device, sending a defrosting indicator lamp starting signal to the interface operation module, controlling the prompter to send out nine prompt tones, and starting the defrosting indicator lamp by the interface operation module;
in the defrosting process of the defrosting device, when the alarm module detects that the temperature rises to less than 2 ℃ within ten minutes, the alarm module is controlled to give out nine-tone prompt tones and send signals for starting an alarm prompt lamp to the interface operation module; the alarm module controls the prompter to send out nine-tone prompt tones and sends a signal for starting the alarm prompt lamp to the interface operation module, the alarm prompt lamp is started to alarm and inform workers, and the workers close the alarm prompt lamp to verify whether the refrigeration house has faults or not;
(9) after defrosting is finished, timing delay time after the defrosting judgment sub-module receives a closing signal fed back by the defrosting device, dripping water from the refrigeration house and the air supply type evaporator, and sending a nine-tone prompt sound to the defrosting judgment sub-module control sub-module and sending an operation signal to the evaporator control sub-module when the delay time reaches 5 minutes;
(10) repeating the steps (2) to (7), and recording the operation data of each step by the statistical module to realize automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed, pressing a stop key to terminate the automatic defrosting mode, then pressing a manual operation key to start a defrosting device, pressing the stop key to close the defrosting device after defrosting is finished, and when pressing the automatic operation key again, starting the automatic defrosting mode; when the controller needs to be initialized, a reset key is pressed to initialize the controller; and when the negative pressure type automatic defrosting system needs to be closed, pressing a closing key to close the negative pressure type automatic defrosting system.
Compared with the prior art, the designed negative pressure type automatic defrosting system is reasonable, complete, scientific and practical, intelligently detects the frosting amount of the evaporator through the wind pressure sensor arranged in the freezing and refrigerating air supply type evaporation heat exchanger, can automatically and accurately capture and identify the optimal defrosting time, achieves the energy-saving purpose of optimizing the cold storage resources, simultaneously determines the defrosting termination according to the temperature variation or the defrosting time, keeps the constant temperature of the cold storage, improves the storage quality, reduces the loss rate, and is environment-friendly.
Description of the drawings:
fig. 1 is a schematic block diagram of the main structure of the negative pressure type automatic defrosting system according to the present invention.
Fig. 2 is a schematic block diagram of the structural principle of the blower type evaporator according to the present invention.
Fig. 3 is a schematic block diagram of a module structure of a controller according to the present invention.
Fig. 4 is a schematic block diagram of the structural principle of the interface operation module according to the present invention.
Fig. 5 is a schematic block diagram of a structural principle of a parameter setting module according to the present invention.
Fig. 6 is a schematic block diagram illustrating the structural principle of the autorun module according to the present invention.
Fig. 7 is a specific process flow block diagram of the negative pressure type automatic defrosting method related to the invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1:
the negative pressure type automatic defrosting system related to the embodiment comprises a main body structure of a controller 1, a compressor 2, an air supply type evaporator 3, a wind pressure sensor 4, a defrosting device 5 and a temperature sensor 6; the controller 1 adopts the structure of the existing equipment controller, the controller 1 is installed outside the refrigeration house, the controller 1 is respectively connected with the compressor 2, the air supply type evaporator 3, the air pressure sensor 4 and the temperature sensor 6 through electric information, the air pressure sensor 4 is fixedly installed in the shell of the air supply type evaporator 3, and the air pressure sensor 4 is used for detecting the air pressure value in the air supply type evaporator 3; the controller 1 is in electrical information connection with the defrosting device 5, the controller 1 is in electrical connection with a power supply, the defrosting device 5 adopts the existing defrosting equipment, and the operation of the whole set of system is automatically controlled by the controller 1.
The air-supplying type evaporator 3 related to the embodiment comprises a wind pressure sensor 4, an evaporator coil 7, a shell 8, a fan 9 and a fixed block 10, wherein the main evaporation functional component of the air-supplying type evaporator 3 adopts the existing evaporator structure, and the air-supplying type evaporator 3 is different from the existing evaporator in that: an evaporator coil 7 of the air supply type evaporator 3 is fixed at the open end of an open shell 8, two fans 9 with the same structure are symmetrically arranged at the rear end of the shell 8, a fixed block 10 is fixedly arranged between the two fans 9, the front end surface of the fixed block 10 and the front end surface of the fan 9 are positioned at the same vertical end surface, the rear end of the fixed block 10 is fixedly connected with the shell 8, and the front end surface of the fixed block 10 is fixedly connected with the wind pressure sensor 4; when the air supply type evaporator 3 is operated, the rotation directions of the two fans 9 are opposite, when the surface layer of the evaporator coil 7 is not frosted or is low in frosting amount, the air quantity passing through the gap between the evaporator coils 7 is sufficient, the air quantity mainly flows along the direction I, the air quantity flowing along the directions II at the two sides of the air pressure sensor 4 is small, the negative pressure at the position of the air pressure sensor 4 is small, when the surface layer frosting amount of the evaporator coil 7 is large, the gap between the evaporator coils 7 is small, the air quantity passing through the gap between the evaporator coils 7 is insufficient, the air quantity entering the fan 9 from the directions II at the two sides of the air pressure sensor 4 is increased, the negative pressure at the position of the air pressure sensor 4 is increased, and the frosting amount at the surface layer of the evaporator coils 7 is positively correlated with the absolute value of the air pressure (; the frosting amount is calculated through the detected wind pressure according to a conversion formula of the wind pressure and the frosting amount, and when the frosting amount reaches a set value, the negative pressure type automatic defrosting system starts the defrosting device 5 to defrost, so that double optimization of energy conservation and efficiency is achieved.
The controller 1 related to the embodiment comprises an interface operation module 11, a parameter setting module 12, an automatic operation module 13, a manual operation module 14, an alarm module 15, a statistic module 16 and a prompter 17; the interface operation module 11 is respectively connected with the parameter setting module 12, the automatic operation module 13, the manual operation module 14, the alarm module 15 and the statistic module 16 through electric information, the parameter setting module 12 is also connected with the automatic operation module 13 and the alarm module 15 through electric information, and the alarm module 15 is also respectively connected with the automatic operation module 13 and the manual operation module 14 through electric information; the prompter 17 adopts the existing sound prompting equipment, and the prompter 17 is also electrically connected with the automatic operation module 13 and the alarm module 15 respectively; the statistic module 16 is electrically and informationally connected with the automatic operation module 13 and the manual operation module 14 respectively.
The interface operation module 11 according to this embodiment is used to start and acquire information of the parameter setting module 12, the automatic operation module 13, the manual operation module 14, the alarm module 15, and the statistics module 16, and realize control of the controller 1: the interface operation module 11 further comprises a setting key 18, a recording key 19, a time display area 20, a pressure display area 21, a mixed display area 22, a manual operation key 23, an automatic operation key 24, a stop key 25, a compressor operation lamp 26, a start key 27, a close key 28, a defrosting indicator lamp 29, an alarm prompt lamp 30 and a reset key 31 which are respectively connected with the interface operation module 11 through electrical information; a setting key 18 is arranged at the upper left corner of the interface operation module 11, and the parameter setting module 12 is started by using the setting key 18; a record key 19 is arranged at the lower side of the setting key 18, and the counting module 16 is started and records are checked by using the record key 19; the right sides of the setting key 18 and the recording key 19 are provided with a time display area 20, and the time display area 20 is used for displaying time in real time; the middle part of the interface operation module 11 is sequentially provided with a pressure display area 21 and a mixed display area 22, the pressure display area 21 is used for displaying a wind pressure value, and the mixed display area 22 alternately displays the temperature of the refrigeration house, defrosting time and the running time of the compressor 2; a manual operation key 23, an automatic operation key 24 and a stop key 25 are sequentially arranged on the left side of the lower part of the interface operation module 11, the manual operation module 14 is started by using the manual operation key 23, the automatic operation module 13 is started by using the automatic operation key 24, and the manual operation module 14 or the automatic operation module 13 is closed by using the stop key 25; a compressor working lamp 26, a start key 27, a close key 28 and a defrosting indicator lamp 29 are sequentially arranged on the left side of the lower part of the interface operation module 11, the compressor working lamp 26 displays normal operation of the compressor 2, the start key 27 is used for starting the controller 1, and the close key 28 is used for closing the controller; a reset key 31 and an alarm prompting lamp 30 are arranged on the right side of the lower part of the interface operation module 11, the reset key 31 is used for initializing the controller 1, and an alarm is prompted through the alarm prompting lamp 30; a set key 18, a record key 19, a manual operation key 23, an automatic operation key 24, a stop key 25, a compressor operation lamp 26, a start key 27, a close key 28, a defrosting indicator lamp 29, an alarm prompt lamp 30, a reset key 31 or a virtual keyboard structure can be adopted.
The parameter setting module 12 related to this embodiment is configured to log in a parameter setting interface, set a parameter of an automatic defrosting mode, change a login password and a management level, and send the set parameter to the automatic operation module 13 and the alarm module 15; the parameter setting module 12 is respectively connected with the interface operation module 11, the automatic operation module 13 and the alarm module 15 through electric information; the parameter setting module 12 comprises a login submodule 32 and a setting interface submodule 33; the login submodule 32 is used for automatically logging in a parameter setting interface after a password is input, and the password can be set as a four-digit number; the setting interface submodule 33 is used for setting parameters of an automatic defrosting mode, changing a login password and managing levels; the setting interface sub-module 33 includes an opening unit 34, a filling unit 35, and an ending unit 36; the opening unit 34 is used to open the filling unit 35; the starting unit 34 or specifically the SET virtual key presented after the interface operation module 11 enters the setting interface; the filling unit 35 is used for setting parameters, login passwords and management levels of the automatic defrosting mode; the ending unit 36 is used for closing the filling unit 35, exiting the parameter setting module 12 and sending the set parameters to the automatic operation module 13 and the alarm module 15; the ending unit 36 or specifically the ENT virtual key presented after the interface operation module 11 enters the setting interface; the parameters of the automatic defrosting mode filled in by the filling unit 35 include, but are not limited to, a defrosting period, a defrosting air volume setting, a defrosting time, a defrosting stop temperature, a defrosting delay, a time delay after defrosting, an evaporator delay, a compressor delay, a power failure startup delay, a locked set password, a management level, a sensor interruption time, a defrosting volume, a temperature interval value and a temperature rise value, and the setting information of each parameter is shown in the following table:
| serial number | Function(s) | Code | Setting range | Conventional arrangements | Unit of | Notes |
| 1 | Defrosting cycle | F-01 | 0-99 | 48 | Hour(s) | 0 is off |
| 2 | Defrosting air volume setting | F-02 | 0-200 | 70 | kpa | 0 is off |
| 3 | Defrosting time | F-03 | 0-59 | 30 | Minute (min) | 0 is off |
| 4 | Defrosting stop temperature | F-04 | -10℃-30℃ | 0 | DEG C degree | 0 is off |
| 5 | Delay of defrosting | F-05 | 0-59 | 1 | Minute (min) | 0 is off |
| 6 | Delay after defrosting | F-06 | 0-59 | 5 | Minute (min) | 0 is off |
| 7 | Evaporator time delay | F-07 | 1-59 | 1 | Minute (min) | 0 is off |
| 8 | Compressor time delay | F-08 | 1-59 | 1 | Minute (min) | 0 is off |
| 9 | Power-off and power-on time delay | F-09 | 1-59 | 1 | Minute (min) | 0 is off |
| 10 | Locking set password | F-10 | 0—10 | 9999 | ||
| 11 | Management level | F-11 | 0-10 | 4321 | ||
| 12 | Sensor interrupt duration | F-12 | 0-30 | 10 | Second of | 0 is normal |
| 13 | Amount of frosting | F-13 | 0-100 | 30 | ％ | 0 is off |
| 14 | Value of temperature interval | F-14 | 0-10 | 4 | DEG C degree | 0 is normal |
| 15 | Temperature rise value | F-15 | 0-40 | 2 | DEG C degree | 0 is off |
The manual operation module 14 according to the present embodiment is configured to: and receiving a forced defrosting signal sent by the interface operation module 11 to turn on the defrosting device 5, or receiving a defrosting termination signal sent by the interface operation module 11 to turn off the defrosting device 5.
The alarm module 15 according to the present embodiment is configured to: detecting whether the connection between the wind pressure sensor 4 and the temperature sensor 6 and the controller 1 is normal or not, and controlling the prompter 17 to emit a nine-tone prompt sound and send a signal for starting the alarm prompt lamp 30 to the interface operation module 11 when the connection interruption duration between the wind pressure sensor 4 and the temperature sensor 6 and the controller 1 exceeds the set interruption duration; when the temperature change exceeds the temperature interval value within two hours in the automatic defrosting mode, the temperature rises to be less than the temperature rise value within ten minutes in the defrosting stage or the operation of the compressor 2 reaches the set defrosting period time to defrost, the control prompter 17 gives out nine-sound prompt sound and sends a signal for starting the alarm prompt lamp 30 to the interface operation module 11.
The statistical module 16 according to the present embodiment is used for counting the operation records of the controller 1, and the records include: compressor start and stop date and time, defrosting start and stop date and time, compressor work timing, accumulated running time (days) (the working time of the compressor can be counted in the running inner date), and cycle data statistics (refrigerating time, defrosting time, refrigerating and defrosting proportion).
The automatic operation module 13 according to this embodiment is configured to receive an automatic operation signal of the interface operation module 11 and sequentially start the air supply evaporator 3 and the compressor 2, suspend the air supply evaporator 3 and the compressor 2 when the operation time of the compressor 2 reaches a defrosting period or the amount of frost reaches a defrosting amount, turn on the defrosting device 5 for defrosting, turn off the defrosting device 5 when the defrosting time reaches a set value or the temperature of the freezer reaches a defrosting stop temperature, and sequentially start the air supply evaporator 3 and the compressor 2; the automatic operation module 13 comprises an evaporator control submodule 37, a compressor control submodule 38, a defrosting judgment submodule 39 and a defrosting judgment submodule 40; each submodule is specifically as follows:
the evaporator control submodule 37 is configured to receive an automatic operation signal of the interface operation module 11 and start the air supply evaporator 3, send a start signal to the compressor control submodule 38 after detecting that the air supply evaporator 3 is started, and suspend the air supply evaporator 3 after receiving a suspension signal sent by the defrosting judgment submodule 39; the evaporator control submodule 37 is respectively connected with the interface operation module 11, the compressor control submodule 38, the defrosting judgment starting submodule 39, the defrosting judgment submodule 40 and the air supply type evaporator 3 through electrical information;
the compressor control submodule 38 is configured to: starting the compressor 2 after receiving a starting signal of the evaporator control submodule 37; when the compressor 2 is detected to be started, a signal for starting a compressor working lamp is sent to the interface operation module 11, and an operation signal is sent to the defrosting judgment starting sub-module 39; the compressor 2 is suspended after receiving the suspension signal sent by the defrosting judgment submodule 39; the compressor control submodule 38 is respectively connected with the interface operation module 11, the defrosting judgment submodule 39 and the compressor 2 through electrical information;
the defrosting judgment submodule 39 is configured to: after receiving an operation signal sent by a compressor promoter module, recording the operation time of the compressor 2 and monitoring the frosting amount of the air supply type evaporator 3; when the running time reaches the defrosting period or the defrosting amount reaches the defrosting amount, ending the running time timing of the compressor 2, sending a pause signal to the evaporator control submodule 37 and the compressor control submodule 38, and starting the defrosting device 5; after receiving a starting signal of the defrosting device 5, sending a starting signal to the defrosting judgment sub-module 40; the defrosting judgment submodule 39 includes a cycle timing unit 41 and a frosting amount judgment unit 42;
the cycle timing unit 41 is configured to: recording the running time of the compressor 2; the running time is cleared after receiving the running time timing signal of the compressor 2 ending of the frosting amount determination unit 42; when the running time of the compressor 2 reaches the set defrosting cycle time, automatically ending the running time timing of the compressor 2 and resetting, sending a pause signal to the evaporator control submodule 37 and the compressor control submodule 38, and starting the defrosting device 5 to defrost; after receiving a starting signal of the defrosting device 5, sending a starting signal to the defrosting judgment sub-module 40; the period timing unit 41 is electrically connected with the evaporator control submodule 37, the compressor control submodule 38, the defrosting device 5, the frosting amount judging unit 42 and the defrosting judgment submodule 40;
the frosting amount determination unit 42 is configured to: receiving a wind pressure value detected by a wind pressure sensor 4 and converting the wind pressure value into the frosting amount; when the frosting amount reaches the set defrosting amount, sending a running time timing signal for ending the compressor 2 to the period timing unit 41, sending a pause signal to the evaporator control submodule 37 and the compressor control submodule 38, and starting the defrosting device 5 to defrost; after receiving a starting signal of the defrosting device 5, sending a starting signal to the defrosting judgment sub-module 40; the frosting amount judgment unit 42 is also respectively connected with the evaporator control submodule 37, the compressor control submodule 38, the defrosting device 5 and the defrosting judgment submodule 40 through electrical information;
the defrosting judgment sub-module 40 is used for: timing defrosting time, receiving the temperature detected by the temperature sensor 6, and sending a running stop signal to the defrosting device 5 when the defrosting time reaches a set value or the temperature of the refrigeration house reaches a defrosting stop temperature; after receiving a closing signal fed back by the defrosting device 5, sending a signal for turning on a defrosting indicator lamp 29 to the interface operation module 11, and controlling the prompter 17 to send out nine prompt tones; after receiving a closing signal fed back by the defrosting device 5, timing delay time, and when the delay time reaches a set value, controlling the prompter 17 to emit nine-tone prompt tones and sending an operation signal to the evaporator control submodule 37; the defrosting judgment sub-module 40 is also electrically and information-connected with the interface operation module 11, the temperature sensor 6 and the evaporator control sub-module 37 respectively.
Example 2:
the automatic defrosting method of the negative pressure type automatic defrosting system applied to the embodiment 1 comprises the following steps:
(1) starting the controller 1, inputting a password login parameter setting interface according to a setting key 18, setting parameters of an automatic defrosting mode, changing a login password and a management level, and sending the set parameters to the automatic operation module 13;
(2) the controller 1 detects whether the connection between the wind pressure sensor 4 and the temperature sensor 6 and the controller 1 is normal, and when the connection interruption time of the wind pressure sensor 4 and the connection interruption time of the temperature sensor 6 and the controller 1 exceed the set interruption time, the control prompter 17 sends out a nine-tone prompt sound and starts the alarm prompt lamp 30;
(3) pressing the automatic run key 24 starts the automatic defrosting mode; or when the power is on after the power failure condition is over, the controller 1 starts the automatic defrosting mode in a delayed mode;
(4) after the automatic defrosting mode is started, the air supply type evaporator 3 is started in a delayed mode, and the delay time is set according to production requirements and equipment performance;
(5) after the air supply type evaporator 3 is started, the compressor 2 is started in a delayed mode, and the delay time can be set to be 30S;
(6) after the compressor 2 is started, the controller 1 starts to time the running time of the compressor 2 after receiving a running signal fed back by the compressor 2; at the same time, the compressor work light is on 26;
(7) the controller 1 receives a wind pressure value detected by the wind pressure sensor 4, calculates the frosting amount of the air supply type evaporator 3 according to a conversion formula of the wind pressure and the frosting amount, suspends the compressor 2 and the air supply type evaporator 3 when the frosting amount reaches a set defrosting amount or the running time of the compressor 2 reaches a defrosting period, ends the running time timing of the compressor, and starts the defrosting device in a delayed manner; the conversion formula of the wind pressure and the frosting amount is as follows:
Pf＝Pw*k+a
pf is frosting amount, unit%; pw is a negative pressure value (absolute value is taken during calculation), and the unit Pa; a, regulating offset of frosting, wherein the unit is &; k is the proportionality coefficient of pressure/frosting amount, unit%/Pa; each different type of evaporator, a and k, will vary due to the construction, fan, etc.
a and k calculation method:
the calculation method of a is that the fan is started in a frost-free state, the evaporator is gradually shielded by using the shielding plate, the percentage of shielded area (shielded part area/total evaporator area) when the wind pressure begins to change is recorded as a
k, a calculation method: starting the fan in a frost-free state, using a baffle plate to completely shield the evaporator, and recording the current wind pressure Pw (max), k being 100/Pw (max)
(8) After the defrosting device 5 is started, the controller 1 counts defrosting time, receives the temperature detected by the temperature sensor, and closes the defrosting device 5 when the defrosting time reaches a set value or the temperature of the refrigeration house reaches a defrosting stop temperature; meanwhile, the defrosting indicator light 29 is turned on, and the prompter 17 gives out nine-tone prompt tones;
(9) after defrosting is finished, the cold storage carries out delayed dripping, the delayed time is finished, the prompter 17 gives out nine-tone prompt sound, and the air supply type evaporator 3 is started;
(10) repeating the steps (2) to (7), and recording the operation data of each step to realize automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed (such as defrosting completely after the refrigerator is emptied), the automatic defrosting mode is stopped by pressing the stop key 25, the defrosting device 5 is started by pressing the manual operation key 23, the defrosting device 5 is closed by pressing the stop key 25 after defrosting is finished, and the automatic defrosting mode is started by pressing the automatic operation key 24 again; when the controller 1 needs to be initialized (for example, the set parameters and the alarm records are cleared), the reset key 31 is pressed to initialize the controller 1; when the negative pressure type automatic defrosting system needs to be closed, the closing key 28 is pressed to close the negative pressure type automatic defrosting system.
Example 3:
a specific automatic defrosting method applying the negative pressure type automatic defrosting system in the embodiment 1 comprises the following steps:
(1) starting the controller 1 by pressing the start key 27, entering the parameter setting module 12 by pressing the set key 18, inputting a four-digit password or an initial password 9999, logging in a parameter setting interface, setting parameters of an automatic defrosting mode, setting a defrosting period to be 48 hours, a defrosting air volume to be 70Kpa, a defrosting time to be 30 minutes, a defrosting stop temperature to be 0 ℃, a defrosting time delay to be 1 minute, a defrosting time delay to be 5 minutes, an evaporator time delay to be 1 minute, a compressor time delay to be 1 minute, a power failure startup time delay to be 1 minute, a sensor interrupt time length to be 10 seconds, a frosting amount to be 30%, a temperature interval value to be 4 ℃ and a temperature rise value to be 2 ℃, and sending the set parameters to the automatic operation module 13;
(2) the alarm module 15 detects whether the connection between the wind pressure sensor 4 and the temperature sensor 6 and the controller 1 is normal, when the connection interruption time of the wind pressure sensor 4 and the connection interruption time of the temperature sensor 6 and the controller 1 exceeds the set interruption time, the control prompter 17 sends out a nine-tone prompt sound, the alarm module 15 sends signal lamp starting information to the interface operation module 11, and the interface operation module 11 starts the alarm prompt lamp 30;
(3) pressing the automatic operation key 24 to start the automatic operation module 13 to enter an automatic defrosting mode; or when the power is on after the power failure condition is over, the controller 1 delays for 1 minute to start the automatic defrosting mode;
(4) after the automatic defrosting mode is started, the evaporator control submodule 37 delays for 1 minute to start the air supply type evaporator 3 after receiving an automatic operation signal of the interface operation module 11, and after the air supply type evaporator 3 is started, the evaporator control submodule 37 sends a starting signal to the compressor control submodule 38;
(5) the compressor control submodule 38 delays for 1 minute to start the compressor 2 after receiving the starting signal of the evaporator control submodule 37; when the compressor control submodule 38 receives the operation signal fed back by the compressor 2, the compressor control submodule 38 sends a signal 26 for turning on the compressor work light to the interface operation module 11, the interface operation module 11 turns on the compressor work light 26, and simultaneously the compressor control submodule 38 sends an operation signal to the defrosting judgment submodule 39;
(6) after the compressor works, the alarm module 15 detects that the temperature rises to be over 4 ℃ within two hours, the alarm module 15 controls the prompter 17 to emit nine-tone prompt tones and sends signals for starting the alarm prompt lamp 30 to the interface operation module 11, the alarm prompt lamp 30 is started to alarm and inform a worker, the worker closes the alarm prompt lamp 30 and checks whether the refrigeration house has a fault;
(7) the defrosting judgment and starting sub-module 39 starts to record the running time of the compressor 2, receives the wind pressure value detected by the wind pressure sensor 4 and sends the running time to the interface operation module 11 for display after receiving the running signal sent by the compressor control sub-module 38, the defrosting judgment and starting sub-module 39 calculates the frosting amount of the air supply evaporator 3 according to the conversion formula of the wind pressure and the frosting amount, when the frosting amount reaches 30% or the running time of the compressor 2 reaches 48 hours, the defrosting judgment and starting sub-module 39 finishes the running time timing of the compressor 2, sends a pause signal to the evaporator control sub-module 37 and the compressor control sub-module 38 to pause the compressor 2 and the air supply evaporator 3, and sends a starting signal to the defrosting device 5 to delay for 1 minute to start the defrosting device 5; the defrosting judgment starting submodule 39 sends a starting signal to the defrosting judgment submodule 40 after receiving the starting signal of the defrosting device 5; the conversion formula of the wind pressure and the frosting amount is as follows:
Pf＝Pw*k+a
pf is frosting amount, unit%; pw is a negative pressure value (absolute value is taken during calculation), and the unit Pa; a, regulating offset of frosting, wherein the unit is &; k is the proportionality coefficient of pressure/frosting amount, unit%/Pa; each different type of evaporator, a and k, will vary due to the construction, fan, etc.
a and k calculation method:
the calculation method of a is that the fan is started in a frost-free state, the evaporator is gradually shielded by using the shielding plate, the percentage of shielded area (shielded part area/total evaporator area) when the wind pressure begins to change is recorded as a
k, a calculation method: starting the fan in a frost-free state, using a baffle plate to completely shield the evaporator, and recording the current wind pressure Pw (max), k being 100/Pw (max)
(8) After the defrosting judgment sub-module 40 receives a starting signal for starting the defrosting device 5, the defrosting judgment sub-module 40 starts timing the defrosting time, receives the temperature of the refrigerator detected by the temperature sensor 6, and sends the detected defrosting time and the detected temperature of the refrigerator to the interface operation module 11, the interface operation module 11 displays the defrosting time and the temperature of the refrigerator, and when the defrosting time reaches 30 minutes or the temperature of the refrigerator reaches 0 ℃, the defrosting judgment sub-module 40 sends a running stop signal to the defrosting device 5; after receiving a closing signal fed back by the defrosting device 5, sending a signal for turning on the defrosting indicator lamp 29 to the interface operation module 11, controlling the prompter 17 to send out nine prompt tones, and turning on the defrosting indicator lamp 29 by the interface operation module 11;
in the defrosting process of the defrosting device 5, when the alarm module 15 detects that the temperature rises to less than 2 ℃ within ten minutes, the control prompter 17 sends out nine-tone prompt tones and sends signals for starting the alarm prompt lamp 30 to the interface operation module 11; the alarm module 15 controls the prompter 17 to send out a nine-tone prompt tone and sends a signal for starting the alarm prompt lamp 30 to the interface operation module 11, the alarm prompt lamp 30 is started to alarm and inform a worker, the worker closes the alarm prompt lamp 30 and checks whether the refrigeration house has a fault;
(9) after defrosting is finished, the defrosting judgment sub-module 40 counts delay time after receiving a closing signal fed back by the defrosting device 5, the refrigeration house and the air supply type evaporator 3 drips water, and when the delay time reaches 5 minutes, the defrosting judgment sub-module 40 controls the prompter 17 to give out a nine-tone prompt sound and sends an operation signal to the evaporator control sub-module 37;
(10) repeating the steps (2) to (7), and recording the operation data of each step by the statistical module 16 to realize the automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed (such as defrosting completely after the refrigerator is emptied), the automatic defrosting mode is stopped by pressing the stop key 25, the defrosting device 5 is started by pressing the manual operation key 23, the defrosting device 5 is closed by pressing the stop key 25 after defrosting is finished, and the automatic defrosting mode is started by pressing the automatic operation key 24 again; when the controller 1 needs to be initialized (for example, the set parameters and the alarm records are cleared), the reset key 31 is pressed to initialize the controller 1; when the negative pressure type automatic defrosting system needs to be closed, the closing key 28 is pressed to close the negative pressure type automatic defrosting system.
The negative pressure type automatic defrosting system and the method thereof related to the embodiment have the energy-saving effect related to the conditions of the size of a refrigeration house, the regular defrosting interval, the average door opening time per day, the local temperature and humidity, the types of stored goods and the like; through simulation test and calculation, the theoretical energy-saving efficiency of the negative pressure type automatic defrosting system fluctuates by 30-70% according to the different conditions; the four-seat 5 x 8 meter refrigeration house is adopted to carry out a comparison test on the negative pressure type automatic defrosting system, the method thereof and the existing refrigeration house defrosting system, the cargo storage amount in the refrigeration house is 30-50%, the door of the refrigeration house is opened 1-2 times every day, 5 minutes of opening the door of the refrigeration house every time is set to be defrosting once every 6 hours, the negative pressure type automatic defrosting system is opened for defrosting 1 time every day in summer with an average energy-saving effect of 50%, is opened once every 3 days in winter with an average energy-saving effect of 80%.
Claims (9)
1. A negative pressure type automatic defrosting system comprises a main structure, a controller, a compressor, an air supply type evaporator, an air pressure sensor, a defrosting device and a temperature sensor, wherein the air supply type evaporator is arranged on the main structure; the air supply type evaporator comprises an air pressure sensor, an evaporator coil, a shell, fans and a fixed block, wherein the evaporator coil of the air supply type evaporator is fixed at the open end of the open type shell, and the rear end of the shell is symmetrically provided with two fans with the same structure; the method is characterized in that: a fixed block is fixedly arranged between the two fans, the front end surface of the fixed block and the front end surface of each fan are positioned on the same vertical end surface, the rear end of the fixed block is fixedly connected with the shell, and the front end surface of the fixed block is fixedly connected with the wind pressure sensor; the controller adopts the structure of the existing equipment controller, the controller is arranged outside the refrigeration house, the controller is respectively connected with the compressor, the air supply type evaporator, the air pressure sensor and the temperature sensor in an electrical information mode, the air pressure sensor is fixedly arranged in the shell of the air supply type evaporator, and the air pressure sensor is used for detecting the air pressure value in the air supply type evaporator; when the air supply type evaporator runs, the rotation directions of the two fans are opposite, the surface layers of the evaporator coils are not frosted or the frosting amount is small, the air quantity passing through a gap between the evaporator coils is sufficient, the air quantity mainly flows along the direction I which is towards the fans, the air quantity flowing along the directions II at the two sides of the air pressure sensor is small, the negative pressure at the position where the air pressure sensor is located is small, when the frosting amount at the surface layers of the evaporator coils is large, the gap between the evaporator coils is small, the air quantity passing through the gap between the evaporator coils is insufficient, the air quantity entering the fans from the directions II at the two sides of the air pressure sensor is increased, the negative pressure at the position where the air pressure sensor is located is increased, and the frosting amount at the surface layers of the evaporator coils is positively; the controller is connected with the defrosting device through electrical information, the controller is electrically connected with the power supply, the controller calculates the defrosting amount through the detected wind pressure according to a conversion formula of the wind pressure and the defrosting amount, and when the defrosting amount reaches a set value, the negative pressure type automatic defrosting system starts the defrosting device to defrost.
2. The negative pressure type automatic defrosting system according to claim 1, characterized in that: the controller comprises an interface operation module, a parameter setting module, an automatic operation module, a manual operation module, an alarm module, a statistic module and a prompter; the interface operation module is respectively connected with the parameter setting module, the automatic operation module, the manual operation module, the alarm module and the statistic module through electrical information, the parameter setting module is also connected with the automatic operation module and the alarm module through electrical information, and the alarm module is also respectively connected with the automatic operation module and the manual operation module through electrical information; the prompter adopts the existing sound prompting equipment, and is also electrically connected with the automatic operation module and the alarm module respectively; the statistical module is respectively connected with the automatic operation module and the manual operation module through electric information.
3. The negative pressure type automatic defrosting system according to claim 2, characterized in that: the interface operation module is used for: starting and acquiring information of a parameter setting module, an automatic operation module, a manual operation module, an alarm module and a statistic module, and realizing the control of the controller;
the parameter setting module is used for: logging in a parameter setting interface, setting parameters of an automatic defrosting mode, changing a login password and a management level, and sending the set parameters to an automatic operation module and an alarm module;
the manual operation module is used for: receiving a forced defrosting signal sent by the interface operation module to start the defrosting device, or receiving a defrosting termination signal sent by the interface operation module to stop the defrosting device;
the alarm module is used for: detecting whether the connection of the wind pressure sensor, the temperature sensor and the controller is normal or not, and controlling the prompter to send out a nine-tone prompt sound and send a signal for starting an alarm prompt lamp to the interface operation module when the connection interruption time of the wind pressure sensor, the temperature sensor and the controller exceeds the set interruption time; when the temperature change exceeds a temperature interval value within two hours in the automatic defrosting mode, the temperature rises to be less than a temperature rise value within ten minutes in the defrosting stage or the compressor runs for a set defrosting period time to defrost, the prompting device is controlled to give out nine-tone prompting sound, and an alarm prompting lamp starting signal is sent to the interface operation module;
the statistics module is to: the statistical controller runs records, wherein the records comprise: the starting and stopping date and time of the compressor, the starting and stopping date and time of defrosting, the working timing of the compressor, and the accumulated running time and period data statistics;
the automatic operation module is used for: and receiving an automatic operation signal of the interface operation module, sequentially starting the air supply type evaporator and the compressor, pausing the air supply type evaporator and the compressor when the operation time of the compressor reaches a defrosting period or the defrosting amount reaches the defrosting amount, starting the defrosting device to defrost, and closing the defrosting device and sequentially starting the air supply type evaporator and the compressor when the defrosting time reaches a set value or the temperature of the refrigeration house reaches the defrosting stop temperature.
4. The negative pressure type automatic defrosting system according to claim 3, characterized in that: the interface operation module also comprises a setting key, a recording key, a time display area, a pressure display area, a mixed display area, a manual operation key, an automatic operation key, a stop key, a compressor working lamp, a start key, a close key, a defrosting indicator lamp, an alarm prompt lamp and a reset key which are respectively in electrical information connection with the interface operation module; the setting key is arranged at the upper left corner of the interface operation module, and the parameter setting module is started by using the setting key; a recording key is arranged on the lower side of the setting key, and the counting module is started and the record is checked by using the recording key; a time display area is arranged on the right side of the setting key and the recording key and is used for displaying time in real time; the middle part of the interface operation module is sequentially provided with a pressure display area and a mixed display area, the pressure display area is used for displaying a wind pressure value, and the mixed display area alternately displays the temperature of the refrigeration house, defrosting time and the running time of the compressor; the left side of the lower part of the interface operation module is sequentially provided with a manual operation key, an automatic operation key and a stop key, the manual operation module is started by using the manual operation key, the automatic operation module is started by using the automatic operation key, and the manual operation module or the automatic operation module is closed by using the stop key; the left side of the lower part of the interface operation module is sequentially provided with a compressor working lamp, a starting key, a closing key and a defrosting indicator lamp, wherein the compressor working lamp displays the normal operation of the compressor, the starting key is used for starting the controller, and the closing key is used for closing the controller; a reset key and an alarm prompting lamp are arranged on the right side of the lower part of the interface operation module, the reset key is used for initializing the controller, and the alarm is prompted through the alarm prompting lamp; the setting key, the recording key, the manual operation key, the automatic operation key, the stop key, the compressor work light, the start key, the close key, the defrosting indicator light, the alarm indicator light and the reset key adopt a virtual keyboard structure.
5. The negative pressure type automatic defrosting system according to claim 4, characterized in that: the parameter setting module comprises a login submodule and a setting interface submodule; the login submodule is used for automatically logging in a parameter setting interface after a password is input, and the password can be set as a four-digit number; the setting interface submodule is used for setting parameters of an automatic defrosting mode, changing a login password and managing levels; the setting interface sub-module comprises an opening unit, a filling unit and an ending unit; the opening unit is used for opening the filling unit; starting a unit or specifically an SET virtual key presented after an interface operation module enters a SET interface; the filling unit is used for setting parameters, login passwords and management levels of the automatic defrosting mode; the finishing unit is used for closing the filling unit, exiting the parameter setting module and sending the set parameters to the automatic operation module and the alarm module; the end unit or the specific end virtual key is presented after the interface operation module enters a set interface; the parameters of the automatic defrosting mode filled in by the filling unit include, but are not limited to a defrosting period, a defrosting air volume setting, a defrosting time, a defrosting stop temperature, a defrosting delay, a time delay after defrosting, an evaporator delay, a compressor delay, a power failure startup delay, a locking setting password, a management level, a sensor interrupt time length, a defrosting amount, a temperature interval value and a temperature rise value.
6. The negative pressure type automatic defrosting system according to claim 5, characterized in that: the automatic operation module comprises an evaporator control submodule, a compressor control submodule, a defrosting judgment starting submodule and a defrosting judgment stopping submodule; each submodule is specifically as follows:
the evaporator control submodule is used for receiving an automatic operation signal of the interface operation module and starting the air supply type evaporator, sending a starting signal to the compressor control submodule after detecting that the air supply type evaporator is started, and pausing the air supply type evaporator after receiving a pause signal sent by the defrosting judgment starting submodule; the evaporator control submodule is respectively connected with the interface operation module, the compressor control submodule, the defrosting judgment starting submodule, the defrosting judgment stopping submodule and the air supply type evaporator through electrical information;
the compressor control submodule is used for: starting a compressor after receiving a starting signal of an evaporator control submodule; when the starting work of the compressor is detected, a signal for starting a working lamp of the compressor is sent to the interface operation module, and an operation signal is sent to the defrosting judgment starting sub-module; the compressor is paused after the pause signal sent by the defrosting judgment submodule is received; the compressor control submodule is respectively connected with the interface operation module, the defrosting judgment starting submodule and the compressor electrical information;
the defrosting judgment submodule is used for: after receiving an operation signal sent by a compressor promoter module, recording the operation time of the compressor and monitoring the frosting amount of the air supply type evaporator; when the running time reaches the defrosting period or the defrosting amount reaches the defrosting amount, ending the running time timing of the compressor, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule;
the defrosting judgment submodule is used for: timing defrosting time, receiving the temperature detected by a temperature sensor, and sending a running stop signal to a defrosting device when the defrosting time reaches a set value or the temperature of the refrigeration house reaches a defrosting stop temperature; after receiving a closing signal fed back by the defrosting device, sending a signal for turning on a defrosting indicator lamp to the interface operation module, and controlling a prompter to give out nine prompt tones; after a closing signal fed back by the defrosting device is received, timing delay time, and controlling the prompter to give out nine prompt tones and send an operation signal to the evaporator control submodule when the delay time reaches a set value; the defrosting judgment submodule is also respectively connected with the interface operation module, the temperature sensor and the evaporator control submodule through electrical information.
7. The negative pressure type automatic defrosting system according to claim 6, characterized in that: the defrosting judgment sub-module comprises a periodic timing unit and a frosting amount judgment unit; the cycle timing unit is to: recording the running time of the compressor; clearing the running time after receiving a running time timing signal of the compressor ending of the frosting amount judgment unit; when the running time of the compressor reaches the set defrosting cycle time, automatically ending the running time timing of the compressor and resetting, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device to defrost; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule; the period timing unit is electrically connected with the evaporator control submodule, the compressor control submodule, the defrosting device, the frosting amount judging unit and the defrosting judging submodule;
the frosting amount judging unit is used for: receiving a wind pressure value detected by a wind pressure sensor and converting the wind pressure value into frosting amount; when the frosting amount reaches the set defrosting amount, sending a running time timing signal for ending the compressor to the period timing unit, sending a pause signal to the evaporator control submodule and the compressor control submodule, and starting the defrosting device to defrost; after receiving a starting signal of the defrosting device, sending a starting signal to the defrosting judgment submodule; the frosting amount judging unit is also respectively connected with the evaporator control submodule, the compressor control submodule, the defrosting device and the defrosting judging submodule through electric information.
8. The negative pressure type automatic defrosting system according to claim 7, characterized in that: the automatic defrosting method of the negative pressure type automatic defrosting system comprises the following steps:
(1) starting the controller, inputting a password login parameter setting interface according to a setting key, setting parameters of an automatic defrosting mode, changing a login password and a management level, and sending the set parameters to the automatic operation module;
(2) the controller detects whether the connection of the wind pressure sensor and the temperature sensor with the controller is normal, and when the connection interruption time of the wind pressure sensor and the temperature sensor with the controller exceeds the set interruption time, the controller controls the prompter to send out a nine-tone prompting sound and turn on the alarm prompting lamp;
(3) pressing an automatic operation key to start an automatic defrosting mode; or when the power is on after the power failure condition is over, the controller delays to start the automatic defrosting mode;
(4) after the automatic defrosting mode is started, the air supply type evaporator is started in a delayed mode, and the delay time is set according to production requirements and equipment performance;
(5) after the air supply type evaporator is started, the compressor is started in a delayed mode, and the delay time is set to be 30S;
(6) after the compressor is started, the controller starts to time the running time of the compressor after receiving a running signal fed back by the compressor, and meanwhile, a working lamp of the compressor is turned on;
(7) the controller receives a wind pressure value detected by the wind pressure sensor, calculates the frosting amount of the air supply type evaporator according to a conversion formula of the wind pressure and the frosting amount, suspends the compressor and the air supply type evaporator when the frosting amount reaches a set defrosting amount or the running time of the compressor reaches the defrosting period duration, ends the running time timing of the compressor and starts the defrosting device in a delayed manner; the conversion formula of the wind pressure and the frosting amount is as follows:
Pf＝Pw*k+a
pf is frosting amount, unit%; pw is a negative pressure value (absolute value is taken during calculation), and the unit Pa; a, regulating offset of frosting, wherein the unit is &; k is the proportionality coefficient of pressure/frosting amount, unit%/Pa; each different type of evaporator, a and k, will vary due to the construction, fan, etc.
a and k calculation method:
the calculation method of a is that the fan is started in a frost-free state, the evaporator is gradually shielded by using the shielding plate, the percentage of shielded area (shielded part area/total evaporator area) when the wind pressure begins to change is recorded as a
k, a calculation method: starting the fan in a frost-free state, using a baffle plate to completely shield the evaporator, and recording the current wind pressure Pw (max), k being 100/Pw (max)
(8) When the defrosting device is started, the controller times defrosting time and receives the temperature detected by the temperature sensor, and when the defrosting time reaches a set value or the temperature of the refrigeration house reaches defrosting stop temperature, the defrosting device is closed; meanwhile, the defrosting indicator lamp is turned on, and the prompter gives out nine-tone prompt tones;
(9) after defrosting is finished, the cold storage carries out delayed dripping, and after the delay time is finished, the prompter gives out nine-tone prompting sound and starts the air supply type evaporator;
(10) repeating the steps (2) to (7), and recording the operation data of each step to realize automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed (such as defrosting completely after a refrigeration house is emptied), pressing a stop key to terminate the automatic defrosting mode, then pressing a manual operation key to start the defrosting device, pressing the stop key to close the defrosting device after defrosting is finished, and when pressing the automatic operation key again, starting the automatic defrosting mode; when the controller needs to be initialized, a reset key is pressed to initialize the controller; and when the negative pressure type automatic defrosting system needs to be closed, pressing a closing key to close the negative pressure type automatic defrosting system.
9. The negative pressure type automatic defrosting system according to claim 8, characterized in that: the negative pressure type automatic defrosting system is combined with the concrete automatic defrosting method of each module, and the concrete automatic defrosting method comprises the following steps:
(1) starting a controller by pressing a start key, entering a parameter setting module by pressing a set key, inputting a four-digit password or an initial password 9999, logging in a parameter setting interface, setting parameters of an automatic defrosting mode, setting a defrosting period to be 48 hours, a defrosting air volume to be 70Kpa, a defrosting time to be 30 minutes, a defrosting stop temperature to be 0 ℃, a defrosting delay to be 1 minute, a defrosting delay to be 5 minutes after defrosting, an evaporator delay to be 1 minute, a compressor delay to be 1 minute, a power failure startup delay to be 1 minute, a sensor interrupt time to be 10 seconds, a frosting amount to be 30%, a temperature interval value to be 4 ℃ and a temperature rise value to be 2 ℃, and sending the set parameters to an automatic operation module;
(2) the alarm module detects whether the connection of the wind pressure sensor and the temperature sensor with the controller is normal or not, when the connection interruption time of the wind pressure sensor and the temperature sensor with the controller exceeds the set interruption time, the control prompter sends out nine-tone prompt sound, the alarm module sends signal lamp starting information to the interface operation module, and the interface operation module starts an alarm prompt lamp;
(3) pressing an automatic operation key to start an automatic operation module to enter an automatic defrosting mode; or when the power is on after the power failure condition is over, the controller delays for 1 minute to start the automatic defrosting mode;
(4) after the automatic defrosting mode is started, the evaporator control submodule delays for 1 minute to start the air supply type evaporator after receiving an automatic operation signal of the interface operation module, and the evaporator control submodule sends a starting signal to the compressor control submodule after the air supply type evaporator is started;
(5) the compressor control submodule delays for 1 minute to start the compressor after receiving a starting signal of the evaporator control submodule; when the compressor control submodule receives an operation signal fed back by the compressor, the compressor control submodule sends a signal for starting a compressor work lamp to the interface operation module, the interface operation module starts the compressor work lamp, and meanwhile the compressor control submodule sends an operation signal to the defrosting judgment starting submodule;
(6) after the compressor works, the alarm module detects that the temperature rises to be more than 4 ℃ within two hours, the alarm module controls the prompter to send out nine-tone prompting sound and sends a signal for starting the alarm prompting lamp to the interface operation module, the alarm prompting lamp is started to alarm and inform a worker, the worker closes the alarm prompting lamp and verifies whether the refrigeration house has a fault or not;
(7) the defrosting judgment starting sub-module starts to record the running time of the compressor, receives a wind pressure value detected by a wind pressure sensor and sends the running time to the interface operation module for display after receiving a running signal sent by the compressor control sub-module, the defrosting judgment starting sub-module calculates the frosting amount of the air supply type evaporator according to a conversion formula of the wind pressure and the frosting amount, and when the frosting amount reaches 30% or the running time of the compressor reaches 48 hours, the defrosting judgment starting sub-module finishes the running time timing of the compressor, sends a pause signal to the evaporator control sub-module and the compressor control sub-module to pause the compressor and the air supply type evaporator, and sends an opening signal to the defrosting device to delay for 1 minute to open the defrosting device; the defrosting judgment starting sub-module sends a starting signal to the defrosting judgment sub-module after receiving the starting signal of the defrosting device;
(8) after the defrosting judgment sub-module receives a starting signal for starting the defrosting device, the defrosting judgment sub-module starts timing defrosting time, receives the temperature of the refrigeration house detected by the temperature sensor, and sends the detected defrosting time and the detected temperature of the refrigeration house to the interface operation module, the interface operation module displays the defrosting time and the temperature of the refrigeration house, and when the defrosting time reaches 30 minutes or the temperature of the refrigeration house reaches 0 ℃, the defrosting judgment sub-module sends a running stop signal to the defrosting device; after receiving a closing signal fed back by the defrosting device, sending a defrosting indicator lamp starting signal to the interface operation module, controlling the prompter to send out nine prompt tones, and starting the defrosting indicator lamp by the interface operation module;
in the defrosting process of the defrosting device, when the alarm module detects that the temperature rises to less than 2 ℃ within ten minutes, the alarm module is controlled to give out nine-tone prompt tones and send signals for starting an alarm prompt lamp to the interface operation module; the alarm module controls the prompter to send out nine-tone prompt tones and sends a signal for starting the alarm prompt lamp to the interface operation module, the alarm prompt lamp is started to alarm and inform workers, and the workers close the alarm prompt lamp to verify whether the refrigeration house has faults or not;
(9) after defrosting is finished, timing delay time after the defrosting judgment sub-module receives a closing signal fed back by the defrosting device, dripping water from the refrigeration house and the air supply type evaporator, and sending a nine-tone prompt sound to the defrosting judgment sub-module control sub-module and sending an operation signal to the evaporator control sub-module when the delay time reaches 5 minutes;
(10) repeating the steps (2) to (7), and recording the operation data of each step by the statistical module to realize automatic circulating defrosting of the negative pressure type automatic defrosting system;
(11) when forced defrosting is needed, pressing a stop key to terminate the automatic defrosting mode, then pressing a manual operation key to start a defrosting device, pressing the stop key to close the defrosting device after defrosting is finished, and when pressing the automatic operation key again, starting the automatic defrosting mode; when the controller needs to be initialized, a reset key is pressed to initialize the controller; and when the negative pressure type automatic defrosting system needs to be closed, pressing a closing key to close the negative pressure type automatic defrosting system.
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| JPS60173881U (en) * | 1984-04-26 | 1985-11-18 | 株式会社東芝 | refrigerator |
| CN1268886C (en) * | 2001-07-20 | 2006-08-09 | 乐金电子(天津)电器有限公司 | Defrosting operation method for heat pumps |
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| CN2828681Y (en) * | 2005-07-20 | 2006-10-18 | 海尔集团公司 | Freezer with pressure balance drainage device |
| CN101438111A (en) * | 2006-05-01 | 2009-05-20 | 开利公司 | Improvement of indoor air quality through re-evaporation control |
| CN101743449A (en) * | 2007-06-29 | 2010-06-16 | 伊莱克斯家用产品公司 | Hot gas defrost method and apparatus |
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