CN110631319A - Synthesize intelligent freezer defrosting device - Google Patents
Synthesize intelligent freezer defrosting device Download PDFInfo
- Publication number
- CN110631319A CN110631319A CN201911017896.3A CN201911017896A CN110631319A CN 110631319 A CN110631319 A CN 110631319A CN 201911017896 A CN201911017896 A CN 201911017896A CN 110631319 A CN110631319 A CN 110631319A
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- defrosting
- air
- sensor
- humidity
- heat exchanger
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- 238000010257 thawing Methods 0.000 title claims abstract description 90
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- 239000003507 refrigerant Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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
- F25D21/006—Defroster control with electronic control circuits
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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
- F25D21/08—Removing frost by electric heating
-
- 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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a comprehensive intelligent refrigerator defrosting device, which comprises a cold fan in a refrigerator, and a fan, a refrigerant liquid inlet pipe, a refrigerant gas return pipe and a fin heat exchanger which are arranged on the cold fan; an air return temperature sensor and an air return pressure sensor are arranged on a refrigerant air return pipe of the air cooler; air pressure difference switches are arranged at the front air inlet and the rear air outlet of the finned heat exchanger; a humidity sensor is arranged in the refrigeration house; a defrosting heating wire is arranged below the fin heat exchanger; the defrosting heating wire is connected with the comprehensive controller through the defrosting heating wire switch. The invention achieves the purposes of defrosting with frost, defrosting without frost and rationality of defrosting period and time, realizes intelligent defrosting operation, greatly shortens defrosting time, reduces defrosting power consumption, and has the effects of energy conservation, emission reduction, low carbon and environmental protection.
Description
Technical Field
The invention relates to the field of defrosting of a refrigeration house, in particular to a comprehensive intelligent refrigeration house defrosting device.
Background
At present, a defrosting mode of a refrigeration house is defrosting at fixed time and fixed period, namely a defrosting period and defrosting time are set for an air cooler of the refrigeration house, when the defrosting period is reached, a system enters a defrosting mode, the defrosting time is calculated, the defrosting time is up and meets defrosting conditions, and the air cooler is just exited, so that the defrosting mode is single or insufficient, no matter whether a heat exchanger of the air cooler has frost or frost, defrosting is achieved when the set period is reached, the air cooler is heated to exit the set temperature or the defrosting time is exited when the set temperature is reached, the defrosting time is longer, the power consumption is higher, the condition of defrosting without frost can be caused in some states, and the refrigeration house defrosting is a heating process, the refrigeration house is cooling equipment, so that the energy consumption waste is serious in a simple defrosting mode.
Disclosure of Invention
In order to solve the problems, the invention provides a comprehensive intelligent refrigeration house defrosting device. The invention solves the problems that the conventional defrosting mode is simple and single, misjudgment is carried out, automatic adjustment and correction can not be carried out according to actual parameters in a warehouse, the defrosting period and the defrosting time are adjusted and corrected manually according to the humidity in the warehouse and the frosting condition of an air cooler, and time and labor are consumed.
In order to realize the technical purpose, the technical scheme of the invention is as follows: a comprehensive intelligent defrosting device for a refrigeration house comprises a cold fan in the refrigeration house, and a fan, a refrigerant liquid inlet pipe, a refrigerant gas return pipe and a fin heat exchanger which are arranged on the cold fan;
an air return temperature sensor and an air return pressure sensor are arranged on a refrigerant air return pipe of the air cooler and are used for measuring air suction pressure and air suction temperature; air pressure difference switches are arranged at the front air inlet and the rear air outlet of the fin heat exchanger and are used for measuring the front air pressure and the rear air pressure of the fin heat exchanger; a humidity sensor is arranged in the cold storage and used for measuring the humidity in the cold storage; a defrosting heating wire is arranged below the fin heat exchanger; set up comprehensive control ware, return air temperature sensor, return air pressure sensor, wind pressure difference switch, humidity transducer pass through the signal line connection comprehensive control ware, the defrosting heater strip is connected through setting up defrosting heater strip switch comprehensive control ware for according to suction pressure, the temperature of breathing in, around the fin heat exchanger wind pressure, the interior humidity data of storehouse, the control defrosting heater strip switch, further control defrosting time and the cycle of defrosting.
Further, the integrated controller adopts a PLC module with the model number of s 7-200.
Further, an analog quantity input module is arranged to be connected with the PLC module; the air return temperature sensor, the air return pressure sensor and the humidity sensor are connected with the PLC module through an analog quantity input module, and the air pressure difference switch is connected with an input/output interface of the PLC module as a switching value.
Further, the analog input module adopts an analog input module with the model of EM AR 04.
Furthermore, the return air temperature sensor adopts a thermistor type temperature sensor, the return air pressure sensor adopts one of a semiconductor piezoresistor type air inlet pressure sensor or a capacitance type air inlet pressure sensor, and the humidity sensor adopts one of a humidity-sensitive resistor type humidity sensor or a humidity-sensitive capacitance type humidity sensor.
The invention has the beneficial effects that:
the invention solves the problems that the conventional defrosting mode is simple and single, misjudgment is carried out, automatic adjustment and correction can not be carried out according to actual parameters in a warehouse, the defrosting period and the defrosting time are adjusted and corrected manually according to the humidity in the warehouse and the frosting condition of an air cooler, and time and labor are consumed.
Drawings
FIG. 1 is a schematic diagram of the main structure of the present invention in FIG. 1;
FIG. 2 is a top view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a schematic view of the modular concept of the present invention;
FIG. 5 is a schematic wiring diagram of the differential wind pressure switch of the present invention;
FIG. 6 is a schematic diagram of the connections of the return air temperature sensor, the return air pressure sensor, and the humidity sensor of the present invention.
In the figure: 1. an air cooler; 2. a wind pressure difference switch; 3. a signal line; 4. a comprehensive controller; 5. a fan; 6. a humidity sensor; 7. defrosting heating wires; 8. a refrigerant inlet pipe; 9. a refrigerant return pipe; 10. a finned heat exchanger; 11. a return air pressure sensor; 12. return air temperature sensor.
Detailed Description
The technical solution of the present invention will be clearly and completely described below.
A comprehensive intelligent refrigerator defrosting device is shown in figures 1-3 and comprises a cold air blower 1 in a refrigerator, and a blower 5, a refrigerant liquid inlet pipe 8, a refrigerant air return pipe 9 and a fin heat exchanger 10 which are arranged on the cold air blower;
an air return temperature sensor 12 and an air return pressure sensor 11 are arranged on a refrigerant air return pipe of the air cooler and used for measuring air suction pressure and air suction temperature; air pressure difference switches 2 are arranged at the front air inlet and the rear air outlet of the fin heat exchanger and are used for measuring the front air pressure and the rear air pressure of the fin heat exchanger; a humidity sensor 6 is arranged in the cold storage and used for measuring the humidity in the cold storage; a defrosting heating wire 7 is arranged below the fin heat exchanger; as shown in fig. 3 and 4, set up comprehensive control ware 4, return air temperature sensor, return air pressure sensor, wind pressure difference switch, humidity transducer pass through signal line 3 and connect comprehensive control ware, the heating wire that defrosts is connected through setting up defrosting heating wire switch comprehensive control ware for according to suction pressure, the temperature of breathing in, wind pressure around the fin heat exchanger, the interior humidity data of storehouse, control defrosting heating wire switch, further control defrosting time and defrosting cycle. The integrated controller judges the frosting degree of the evaporator through a control logic and a pressure difference switch of the air outlet, judges whether the system is in a reliable operation range according to the change of the evaporation pressure of the return air pressure and the return air temperature value, and judges whether the temperature in the warehouse is suitable for defrosting operation according to the detection of the temperature sensor in the warehouse. The three conditions are the basis for judging whether defrosting can be carried out.
Further, the integrated controller adopts a PLC module with the model number of s 7-200.
Further, as shown in fig. 6, an analog input module is arranged to be connected to the PLC module; the return air temperature sensor t1, the return air pressure sensor t2 and the humidity sensor t3 are connected with the PLC module through an analog input module, as shown in fig. 5, the wind pressure difference switch K1 is connected with an input/output interface of the PLC module as a switching value.
Further, as shown in fig. 6, the analog input module is an analog input module with a model of EM AR 04.
Furthermore, the return air temperature sensor adopts a thermistor type temperature sensor, the return air pressure sensor adopts one of a semiconductor piezoresistor type air inlet pressure sensor or a capacitance type air inlet pressure sensor, and the humidity sensor adopts one of a humidity-sensitive resistor type humidity sensor or a humidity-sensitive capacitance type humidity sensor.
The implementation steps of the invention are as follows:
when the air cooler starts refrigeration, the refrigeration house starts to cool, air passes through the finned heat exchanger and forms pressure at an inlet pipe opening and an outlet pipe opening of the air pressure difference switch, the air pressure difference switch is opened at the moment, a defrosting signal is not transmitted to the integrated controller, when the finned heat exchanger frosts to a certain degree, the air quantity passing through the finned heat exchanger is gradually reduced, when the air pressure difference switch is lowered to a set value of the air pressure difference switch, the contact of the air pressure difference switch is disconnected, a switch signal is output to the controller, and meanwhile, the controller detects that the temperature of a refrigerant return air pipe also reaches the set value of defrosting, and the refrigerant return air.
It should be noted that, at this time, if dust or foreign matter is adsorbed, a misjudgment is generated, so the return air temperature and pressure of the system and the humidity in the warehouse are also collected, the defrosting mode is entered only when the defrosting conditions are all met, and when the temperature of the fin heat exchanger reaches a defrosting exit set value, defrosting is stopped, and a defrosting cycle is completed.
If the defrosting time is too short or too long, the setting of the defrosting period is unreasonable, the integrated controller analyzes and corrects the collected data, and the defrosting period is automatically adjusted, so that the defrosting state is reached and the defrosting time is reasonably distributed when defrosting is carried out next time. Specifically, the integrated controller memorizes the air suction pressure, the air suction temperature, the defrosting period, the defrosting time, the front and rear air pressure of the finned heat exchanger, the humidity in the refrigerator and the like during defrosting in the previous time, if the deviation exists with the set parameters of the controller, the next defrosting period and time are automatically adjusted, for example, during defrosting in the previous time, the air pressure difference is small, the defrosting time is short, the air suction pressure and the air suction temperature are higher, the next defrosting automatically increases the defrosting period time and the defrosting time, otherwise, the defrosting period is automatically reduced, and the specifically increasing and reducing time is related to the actual acquisition parameters.
The defrosting acquisition signal is transmitted to the integrated controller through the sensor, the integrated controller performs analysis and memory through a programming program, a logical relation is established, the integrated controller has the functions of memory, analysis and correction, and automatic correction is performed on the previous defrosting data, so that the next defrosting process is more reasonable.
It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (5)
1. A comprehensive intelligent defrosting device for a refrigeration house comprises a cold fan in the refrigeration house, and a fan, a refrigerant liquid inlet pipe, a refrigerant gas return pipe and a fin heat exchanger which are arranged on the cold fan; the method is characterized in that: an air return temperature sensor and an air return pressure sensor are arranged on a refrigerant air return pipe of the air cooler and are used for measuring air suction pressure and air suction temperature; air pressure difference switches are arranged at the front air inlet and the rear air outlet of the fin heat exchanger and are used for measuring the front air pressure and the rear air pressure of the fin heat exchanger; a humidity sensor is arranged in the cold storage and used for measuring the humidity in the cold storage; a defrosting heating wire is arranged below the fin heat exchanger; set up comprehensive control ware, return air temperature sensor, return air pressure sensor, wind pressure difference switch, humidity transducer pass through the signal line connection comprehensive control ware, the defrosting heater strip is connected through setting up defrosting heater strip switch comprehensive control ware for according to suction pressure, the temperature of breathing in, around the fin heat exchanger wind pressure, the interior humidity data of storehouse, the control defrosting heater strip switch, further control defrosting time and the cycle of defrosting.
2. The comprehensive intelligent refrigeration house defrosting device according to claim 1, wherein the comprehensive controller adopts a PLC module with the model number of s 7-200.
3. The comprehensive intelligent refrigeration house defrosting device according to claim 2, characterized in that an analog input module is arranged to be connected with the PLC module; the air return temperature sensor, the air return pressure sensor and the humidity sensor are connected with the PLC module through an analog quantity input module, and the air pressure difference switch is connected with an input/output interface of the PLC module as a switching value.
4. The comprehensive intelligent refrigeration house defrosting device according to claim 3, wherein the analog input module is an analog input module with the model number of EM AR 04.
5. The comprehensive intelligent refrigeration house defrosting device according to claim 4, wherein the return air temperature sensor is a thermistor type temperature sensor, the return air pressure sensor is a semiconductor piezoresistor type air inlet pressure sensor or a capacitor type air inlet pressure sensor, and the humidity sensor is a humidity-sensitive resistor type humidity sensor or a humidity-sensitive capacitor type humidity sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017896.3A CN110631319A (en) | 2019-10-24 | 2019-10-24 | Synthesize intelligent freezer defrosting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017896.3A CN110631319A (en) | 2019-10-24 | 2019-10-24 | Synthesize intelligent freezer defrosting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110631319A true CN110631319A (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911017896.3A Pending CN110631319A (en) | 2019-10-24 | 2019-10-24 | Synthesize intelligent freezer defrosting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN110631319A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426109A (en) * | 2020-03-16 | 2020-07-17 | 科希曼电器有限公司 | Air source heat pump defrosting system and method based on temperature and wind pressure difference detection |
| CN112303816A (en) * | 2020-09-29 | 2021-02-02 | 东风汽车集团有限公司 | Outdoor heat exchanger frosting recognition method and defrosting control method |
| CN112393476A (en) * | 2020-11-11 | 2021-02-23 | 珠海格力电器股份有限公司 | Defrosting control method of refrigerating unit and refrigerating unit |
| US20230138734A1 (en) * | 2021-11-02 | 2023-05-04 | Volkswagen Aktiengesellschaft | Method for operating a heat pump for a motor vehicle and heat pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010035983A2 (en) * | 2008-09-26 | 2010-04-01 | Jin Kum-Soo | Defrosting timing sensing device for an evaporator for a refrigerating cycle |
| CN203642588U (en) * | 2013-09-05 | 2014-06-11 | 徐州市精英冷暖设备工程有限公司 | Intelligent leeway type defrosting device for cold storage |
| CN106839258A (en) * | 2016-12-06 | 2017-06-13 | 珠海格力电器股份有限公司 | Air-cooler and its defrosting control device and method |
| WO2018088845A1 (en) * | 2016-11-10 | 2018-05-17 | 엘지전자 주식회사 | Refrigerator and control method of refrigerator |
| CN110186154A (en) * | 2019-05-31 | 2019-08-30 | 四川长虹空调有限公司 | The defrosting method and device of air-conditioning |
| CN210663548U (en) * | 2019-10-24 | 2020-06-02 | 江苏精英冷暖设备工程有限公司 | Comprehensive intelligent defrosting device for refrigeration house |
-
2019
- 2019-10-24 CN CN201911017896.3A patent/CN110631319A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010035983A2 (en) * | 2008-09-26 | 2010-04-01 | Jin Kum-Soo | Defrosting timing sensing device for an evaporator for a refrigerating cycle |
| CN203642588U (en) * | 2013-09-05 | 2014-06-11 | 徐州市精英冷暖设备工程有限公司 | Intelligent leeway type defrosting device for cold storage |
| WO2018088845A1 (en) * | 2016-11-10 | 2018-05-17 | 엘지전자 주식회사 | Refrigerator and control method of refrigerator |
| CN106839258A (en) * | 2016-12-06 | 2017-06-13 | 珠海格力电器股份有限公司 | Air-cooler and its defrosting control device and method |
| CN110186154A (en) * | 2019-05-31 | 2019-08-30 | 四川长虹空调有限公司 | The defrosting method and device of air-conditioning |
| CN210663548U (en) * | 2019-10-24 | 2020-06-02 | 江苏精英冷暖设备工程有限公司 | Comprehensive intelligent defrosting device for refrigeration house |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426109A (en) * | 2020-03-16 | 2020-07-17 | 科希曼电器有限公司 | Air source heat pump defrosting system and method based on temperature and wind pressure difference detection |
| CN112303816A (en) * | 2020-09-29 | 2021-02-02 | 东风汽车集团有限公司 | Outdoor heat exchanger frosting recognition method and defrosting control method |
| CN112303816B (en) * | 2020-09-29 | 2021-12-14 | 东风汽车集团有限公司 | Outdoor heat exchanger frosting recognition method and defrosting control method |
| CN112393476A (en) * | 2020-11-11 | 2021-02-23 | 珠海格力电器股份有限公司 | Defrosting control method of refrigerating unit and refrigerating unit |
| US20230138734A1 (en) * | 2021-11-02 | 2023-05-04 | Volkswagen Aktiengesellschaft | Method for operating a heat pump for a motor vehicle and heat pump |
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Application publication date: 20191231 |