CN216868892U - Utilize hot freezer defrosting system of refrigerating unit exhaust working medium - Google Patents

Utilize hot freezer defrosting system of refrigerating unit exhaust working medium Download PDF

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Publication number
CN216868892U
CN216868892U CN202220424051.7U CN202220424051U CN216868892U CN 216868892 U CN216868892 U CN 216868892U CN 202220424051 U CN202220424051 U CN 202220424051U CN 216868892 U CN216868892 U CN 216868892U
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China
Prior art keywords
defrosting
air cooler
valve assembly
pipeline
heat
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Expired - Fee Related
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CN202220424051.7U
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Chinese (zh)
Inventor
冯立杰
王昊彬
王延锋
赵文涛
王金凤
刘魁元
张世斌
张玮航
李秀萍
任克非
刘鹏
张珂
李康
赵伟宇
李旭
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Zhengzhou Weixun Electromechanical Equipment Installation Engineering Co ltd
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Zhengzhou Weixun Electromechanical Equipment Installation Engineering Co ltd
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Priority to CN202220424051.7U priority Critical patent/CN216868892U/en
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Abstract

The utility model discloses a refrigerator defrosting system utilizing exhaust working medium heat of a refrigerating unit, which comprises a parallel refrigerating compressor (1), a PLC (programmable logic controller) control cabinet (2), an oil separator (3), a heat recovery heat exchange assembly (4), an evaporative condenser (5), a liquid storage device (6), a first valve assembly (71), a second valve assembly (72), a third valve assembly (73), a first defrosting valve assembly (81), a second defrosting valve assembly (82), a third defrosting valve assembly (83), a first air cooler (91), a second air cooler (92), a third air cooler (93), a heat exchange supply pump (10), a heat preservation water tank (11) and a defrosting supply pump (12), wherein the heat of an overheated high-pressure refrigerant drained by the parallel refrigerating compressor (1) is utilized to heat water in the heat preservation water tank (11) through the heat recovery heat exchange assembly (4), and hot water defrosting of the air cooler is realized based on an s7-200 programmable controller, guarantee high-efficient, stable heat exchange efficiency of air-cooler.

Description

Utilize hot freezer defrosting system of refrigerating unit exhaust working medium
Technical Field
The utility model relates to the technical field of refrigeration of a refrigeration house, in particular to a defrosting system of the refrigeration house by utilizing exhaust working medium heat of a refrigerating unit.
Background
The surface of a cold fan or a pipeline in the refrigeration house is frosted, the cold quantity conduction and emission of the cold fan or the pipeline are seriously influenced, the refrigeration effect of a refrigeration system is hindered, and according to data display, when the thickness of an ice layer on the surface of the cold fan or the pipeline reaches a certain degree, the refrigeration efficiency of the refrigeration system is reduced by 30 percent, the great waste of energy is caused, and the service life of the whole refrigeration system is even greatly shortened. Therefore, the defrosting operation of the refrigeration system is a normal operation that must be performed during the operation of the refrigeration system.
At present, according to different configurations and components of a refrigeration system, common defrosting modes mainly comprise hot gas defrosting (hot fluorine defrosting and hot ammonia defrosting), water spray defrosting, electrical defrosting, mechanical (manual) defrosting and the like, wherein the water spray defrosting is realized by spraying water to the outer surface of an air cooler or a pipeline by using a water spraying device, so that a frost layer is melted by heat of the water and washed and dropped, and the defrosting purpose is achieved. Although the water spray defrosting mode is shorter than the time for defrosting by using refrigerant hot fluorine, is simple to operate and convenient to manage, the operation mode only can remove the frost layer on the outer surface of the air cooler or the pipeline, but can not discharge oil stains or scales and the like in the air cooler or the pipeline, and the defrosting mode is high in water consumption and only suitable for the condition that the quantity of the cold storages is small or the quantity of the air coolers is small; for the defrosting operation of the air coolers of the multi-room refrigeration house, the technical problem needs to be considered, and meanwhile, the problem of the defrosting sequence of different air coolers in the multi-room refrigeration house is a difficult problem to be solved urgently.
In the parallel refrigeration system, refrigeration is mainly used, and the heat of the overheated high-pressure refrigerant discharged by the parallel refrigeration compressor directly enters the outside air through the evaporative condenser, so that the heat is not fully utilized, and a large amount of heat energy is dissipated and consumed. How to convert the heat energy of the overheated high-pressure refrigerant into the energy form that can be recycled, and then be applied to freezer refrigerating system's air-cooler defrosting operation in-process, realize heat energy and recycle, reach energy saving and emission reduction's purpose, need a freezer defrosting system that utilizes refrigerating unit exhaust working medium heat urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the technical defects and provides a defrosting system for a refrigeration house by utilizing exhaust working medium heat of a refrigeration unit, the heat of an overheated high-pressure refrigerant discharged by a parallel refrigeration compressor is converted into hot water, hot water defrosting of an air cooler is realized based on an s7-200 programmable controller, and the high-efficiency and stable heat exchange efficiency of the air cooler is ensured.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a refrigerator defrosting system utilizing exhaust working medium heat of a refrigerating unit comprises a parallel refrigeration compressor, a PLC control cabinet, an oil separator, a heat recovery and heat exchange assembly, an evaporative condenser, a liquid storage device, a first valve assembly, a second valve assembly, a third valve assembly, a first defrosting valve assembly, a second defrosting valve assembly, a third defrosting valve assembly, a first air cooler, a second air cooler, a third air cooler, a heat exchange supply pump, a heat preservation water tank and a defrosting supply pump, wherein the parallel refrigeration compressor, the PLC control cabinet and the oil separator are arranged on a rack of the parallel refrigeration unit, a discharge hole of the parallel refrigeration compressor is connected with an inlet of the oil separator through an exhaust gas collecting pipe, an outlet of the oil separator is connected to an inlet of the evaporative condenser through a pipeline, an outlet of the condenser is connected to an inlet of the liquid storage device through a pipeline, and an outlet pipeline is arranged at an outlet of the liquid storage device, an air return pipeline of the parallel refrigeration compressor is installed at an air return port of the parallel refrigeration compressor, an inlet and an outlet of a first air cooler are respectively connected with an outlet pipeline of the liquid storage device and an air return pipeline of the parallel refrigeration compressor through a first valve component, an inlet and an outlet of a second air cooler are respectively connected with the outlet pipeline of the liquid storage device and the air return pipeline of the parallel refrigeration compressor through a second valve component, an inlet and an outlet of a third air cooler are respectively connected with the outlet pipeline of the liquid storage device and the air return pipeline of the parallel refrigeration compressor through a third valve component, a bottom inlet of a heat recovery heat exchange component is connected to an outlet pipeline of the oil separator through a pipeline, a top outlet of the heat recovery heat exchange component is connected to the liquid storage device through a pipeline, a right inlet of the heat recovery heat exchange component is connected with an outlet of the heat preservation water tank, and a heat exchange supply pump is installed on a pipeline between the right inlet of the heat recovery heat exchange component and the outlet of the heat preservation water tank, the right outlet of the heat recovery heat exchange assembly is connected with the inlet of the heat preservation water tank, the first defrosting valve assembly is installed on a pipeline between the first valve assembly and the first air cooler, the second defrosting valve assembly is installed on a pipeline between the second valve assembly and the second air cooler, the third defrosting valve assembly is installed on a pipeline between the third valve assembly and the third air cooler, the first defrosting valve assembly, the second defrosting valve assembly and the third defrosting valve assembly are sequentially connected to the water outlet pipeline and the water return pipeline of the heat preservation water tank, and the defrosting supply pump is installed on the water outlet pipeline of the heat preservation water tank.
And timers are respectively installed in the first air cooler, the second air cooler and the third air cooler, and signal control lines of the timers are connected with the timing/timer of the s7-200 type programmable logic controller of the PLC control cabinet and are used for respectively calculating the accumulated running time of the first air cooler, the second air cooler and the third air cooler.
The start-stop control lines of the heat exchange supply pump, the defrosting supply pump, the first valve assembly, the second valve assembly, the third valve assembly, the first defrosting valve assembly, the second defrosting valve assembly, the third defrosting valve assembly, the first air cooler, the second air cooler and the third air cooler are connected with an s7-200 type programmable program controller of the PLC control cabinet, and start and stop commands sent by the s7-200 type programmable program controller of the PLC control cabinet are transmitted.
A temperature sensor is arranged in the heat-preservation water tank, and the output end of the temperature sensor is connected with the input port of an s7-200 type programmable controller in the PLC control cabinet.
The cold storage defrosting system utilizing the exhaust working medium heat of the refrigerating unit has the advantages that in the running process of the parallel refrigeration compressor, a temperature sensor arranged in the heat preservation water tank monitors the temperature of water in the heat preservation water tank on line in real time, if the temperature of the water in the heat preservation water tank is lower than a set range, an s7-200 type programmable program controller of the PLC control cabinet sends a starting command to the heat exchange supply pump through a signal control line and opens a valve switch of a water outlet pipeline of the heat preservation water tank, the high-temperature high-pressure refrigerant at the exhaust port of the parallel refrigeration compressor heats the water in the heat-preservation water tank after passing through the heat recovery heat exchange assembly, if the temperature of the water in the heat-preservation water tank is lower than a set range, an s7-200 type programmable program controller of the PLC control cabinet sends a stop command to the heat exchange supply pump through a signal control line and closes a valve switch of a water outlet pipeline of the heat preservation water tank, so that the water temperature of the heat preservation water tank is always in a set range; assuming that a first air cooler of the first air cooler, the second air cooler and the third air cooler is in an operating condition, a timer arranged in the first air cooler times the operating time of the first air cooler in the operating condition, timing information of the timer is transmitted to a timing/timer of an s7-200 type programmable program controller of a PLC (programmable logic controller) through a signal control line, when the operating time of the first air cooler reaches a set value, the s7-200 type programmable program controller of the PLC sends closing and opening commands to a first valve assembly and a first defrosting valve assembly respectively, and simultaneously sends stopping and starting commands to the first air cooler and a defrosting supply pump respectively, at the moment, the defrosting supply pump conveys normal-temperature water of a heat-insulation water tank into the first air cooler, and after defrosting operation for set time, the s7-200 type programmable program controller of the PLC control cabinet sends stopping and starting commands to the first valve assembly and the defrosting supply pump respectively, The first defrosting valve assembly sends opening and closing commands and simultaneously sends starting and stopping commands to the first air cooler and the defrosting supply pump, and then the first air cooler continuously exchanges heat with air in the refrigerator; when the first air cooler is subjected to defrosting operation, if the accumulated running time of the other air coolers reaches a set value, the s7-200 type programmable program controller of the PLC control cabinet is internally calibrated to be in a state waiting for defrosting, and the defrosting operation of the air cooler to be defrosted is immediately switched to after the defrosting operation of the first air cooler is finished; the defrosting operation of going on many air-coolers of going on in proper order is repeated, can realize through this system that single water pump is the defrosting action of many air-coolers, satisfies the defrosting demand of each air-cooler, guarantees air-cooler high efficiency, stable heat exchange efficiency.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Labeled as: 1: a parallel refrigeration compressor; 2: a PLC control cabinet; 3: an oil separator; 4: a heat recovery heat exchange assembly; 5: an evaporative condenser; 6: a reservoir; 71: a first valve assembly; 72: a second valve component; 73: a third valve assembly; 81: a first defrost valve assembly; 82: a second defrost valve assembly; 83: a third defrost valve assembly; 91: a first air cooler; 92: a second air cooler; 93: a third air cooler; 10: a heat exchange feed pump; 11: a heat preservation water tank; 12: a defrosting supply pump.
Detailed Description
One embodiment of the present invention is further described below with reference to FIG. 1:
the freezer defrosting system utilizing the exhaust working medium heat of the refrigerating unit comprises a parallel refrigerating compressor 1, a PLC control cabinet 2, an oil separator 3, a heat recovery heat exchange assembly 4, an evaporative condenser 5, a liquid reservoir 6, a first valve assembly 71, a second valve assembly 72, a third valve assembly 73, a first defrosting valve assembly 81, a second defrosting valve assembly 82, a third defrosting valve assembly 83, a first air cooler 91, a second air cooler 92, a third air cooler 93, a heat exchange supply pump 10, a heat preservation water tank 11 and a defrosting supply pump 12, wherein the parallel refrigerating compressor 1, the PLC control cabinet 2 and the oil separator 3 are arranged on a rack of the parallel refrigerating unit, a discharge hole of the parallel refrigerating compressor 1 is connected with an inlet of the oil separator 3 through an exhaust gas collecting pipe, an outlet of the oil separator 3 is connected with an inlet of the evaporative condenser 5 through a pipeline, the outlet of the evaporative condenser 5 is connected to the inlet of the liquid reservoir 6 through a pipeline, the outlet of the liquid reservoir 6 is provided with an outlet pipeline, the return air inlet of the parallel refrigeration compressor 1 is provided with a return air pipeline of the parallel refrigeration compressor 1, the inlet and the outlet of the first air cooler 91 are respectively connected with the outlet pipeline of the liquid reservoir 6 and the return air pipeline of the parallel refrigeration compressor 1 through the first valve component 71, the inlet and the outlet of the second air cooler 92 are respectively connected with the outlet pipeline of the liquid reservoir 6 and the return air pipeline of the parallel refrigeration compressor 1 through the second valve component 72, the inlet and the outlet of the third air cooler 93 are respectively connected with the outlet pipeline of the liquid reservoir 6 and the return air pipeline of the parallel refrigeration compressor 1 through the third valve component 73, the bottom inlet of the heat recovery and heat exchange component 4 is connected to the outlet pipeline of the oil separator 3 through a pipeline, the top outlet of the heat recovery and exchange component 4 is connected to the liquid reservoir 6 through a pipeline, the right inlet of the heat recovery heat exchange assembly 4 is connected with the outlet of the heat preservation water tank 11, the heat exchange supply pump 10 is installed on the pipeline between the right inlet of the heat recovery heat exchange assembly 4 and the outlet of the heat preservation water tank 11, the right outlet of the heat recovery heat exchange assembly 4 is connected with the inlet of the heat preservation water tank 11, the first defrosting valve assembly 81 is installed on the pipeline between the first valve assembly 71 and the first air cooler 91, the second defrosting valve assembly 82 is installed on the pipeline between the second valve assembly 72 and the second air cooler 92, the third defrosting valve assembly 83 is installed on the pipeline between the third valve assembly 73 and the third air cooler 93, the first defrosting valve assembly 81, the second defrosting valve assembly 82 and the third defrosting valve assembly 83 are sequentially connected to the water outlet pipeline and the water return pipeline of the heat preservation water tank 11, and the defrosting supply pump 12 is installed on the water outlet pipeline of the heat preservation water tank 11.
Timers are respectively installed inside the first air cooler 91, the second air cooler 92 and the third air cooler 93, and signal control lines of the timers are connected with the timers/timers of the s7-200 type programmable logic controller of the PLC control cabinet 2 and used for respectively calculating the accumulated running time of the first air cooler 91, the second air cooler 92 and the third air cooler 93.
The start-stop control lines of the heat exchange supply pump 10, the defrosting supply pump 12, the first valve assembly 71, the second valve assembly 72, the third valve assembly 73, the first defrosting valve assembly 81, the second defrosting valve assembly 82, the third defrosting valve assembly 83, the first air cooler 91, the second air cooler 92 and the third air cooler 93 are connected with an s7-200 type programmable program controller of the PLC control cabinet 2, and transmit start-stop commands sent by the s7-200 type programmable program controller of the PLC control cabinet 2.
A temperature sensor is arranged in the heat-preservation water tank 11, and the output end of the temperature sensor is connected with the input port of an s7-200 type programmable controller in the PLC control cabinet 2.
In the refrigeration house defrosting system utilizing the exhaust working medium heat of the refrigerating unit, in the running process of the parallel refrigeration compressor 1, a temperature sensor arranged in the heat preservation water tank 11 monitors the temperature of the water in the heat preservation water tank 11 on line in real time, if the temperature of the water in the heat preservation water tank 11 is lower than a set range, an s7-200 type programmable controller of the PLC control cabinet 2 sends a starting command to the heat exchange supply pump 10 through a signal control line and opens a valve switch of a water outlet pipeline of the heat preservation water tank 11, a high-temperature high-pressure refrigerant at an exhaust port of the parallel refrigeration compressor 1 heats the water in the heat preservation water tank 11 after passing through the human heat recovery heat exchange component 4, if the temperature of the water in the heat preservation water tank 11 is lower than the set range, an s7-200 type programmable controller of the PLC control cabinet 2 sends a stopping command to the heat exchange supply pump 10 through the signal control line and closes the valve switch of the water outlet pipeline of the heat preservation water tank 11, so that the water temperature of the heat preservation water tank 11 is always in a set range; assuming that the first air cooler 91 of the first air cooler 91, the second air cooler 92 and the third air cooler 93 is in the operating condition, a timer installed inside the first air cooler 91 times the operating time of the first air cooler 91 in the operating condition, and transmits the timing information of the timer to a timing/timer of an s7-200 type programmable controller of the PLC control cabinet 2 through a signal control line, when the operating time of the first air cooler 91 reaches a set value, the s7-200 type programmable controller of the PLC control cabinet 2 respectively transmits a closing and opening command to the first valve assembly 71 and the first defrosting valve assembly 81, and simultaneously transmits a stopping and starting command to the first air cooler 91 and the defrosting supply pump 12, and at this time, the defrosting supply pump 12 transmits the normal temperature water of the heat preservation water tank 11 to the inside of the first air cooler 91, after the defrosting operation is performed for a set time, the s7-200 type programmable controller of the PLC control cabinet 2 sends an opening and closing command to the first valve assembly 71 and the first defrosting valve assembly 81, respectively, and simultaneously sends a start and stop command to the first air cooler 91 and the defrosting supply pump 12, and then the first air cooler 91 continues to exchange heat with the air in the freezer; when the defrosting operation is performed on the first air cooler 91, if the accumulated operation time of the other air coolers reaches a set value, the s7-200 type programmable program controller of the PLC control cabinet 2 is internally calibrated to be in a state waiting for defrosting, and the defrosting operation of the air cooler waiting for defrosting is immediately switched to after the defrosting operation of the first air cooler 91 is finished; the defrosting operation of going on many air-coolers of going on in proper order is repeated, can realize through this system that single water pump is the defrosting action of many air-coolers, satisfies the defrosting demand of each air-cooler, guarantees air-cooler high efficiency, stable heat exchange efficiency.

Claims (4)

1. The utility model provides an utilize freezer defrosting system of refrigerating unit exhaust working medium heat, including parallelly connected refrigerant compressor (1), PLC switch board (2), oil separator (3), heat recovery heat transfer subassembly (4), evaporative condenser (5), reservoir (6), first valve component (71), second valve component (72), third valve component (73), first defrosting valve component (81), second defrosting valve component (82), third defrosting valve component (83), first air-cooler (91), second air-cooler (92), third air-cooler (93), heat transfer feed pump (10), holding water box (11) and defrosting feed pump (12), its characterized in that: the parallel refrigeration compressor (1), the PLC control cabinet (2) and the oil separator (3) are arranged on a rack of a parallel refrigeration unit, a discharge hole of the parallel refrigeration compressor (1) is connected with an inlet of the oil separator (3) through an exhaust gas collecting pipe, an outlet of the oil separator (3) is connected with an inlet of the evaporative condenser (5) through a pipeline, an outlet of the evaporative condenser (5) is connected with an inlet of the liquid accumulator (6) through a pipeline, an outlet pipeline is arranged at an outlet of the liquid accumulator (6), a return pipeline of the parallel refrigeration compressor (1) is arranged at a return port of the parallel refrigeration compressor (1), an inlet and an outlet of a first air cooler (91) are respectively connected with an outlet pipeline of the liquid accumulator (6) and a return pipeline of the parallel refrigeration compressor (1) through a first valve component (71), and an inlet and an outlet of a second air cooler (92) are respectively connected with the outlet pipeline of the liquid accumulator (6) through a second valve component (72), An inlet and an outlet of a third air cooler (93) are respectively connected with an outlet pipeline of the liquid storage device (6) and an air return pipeline of the parallel refrigeration compressor (1) through a third valve component (73), a bottom inlet of the heat recovery heat exchange component (4) is connected to an outlet pipeline of the oil separator (3) through a pipeline, a top outlet of the heat recovery heat exchange component (4) is connected to the liquid storage device (6) through a pipeline, a right inlet of the heat recovery heat exchange component (4) is connected with an outlet of the heat preservation water tank (11), a heat exchange supply pump (10) is installed on a pipeline between the right inlet of the heat recovery heat exchange component (4) and the outlet of the heat preservation water tank (11), a right outlet of the heat recovery heat exchange component (4) is connected with an inlet of the heat preservation water tank (11), a first defrosting valve component (81) is installed on a pipeline between a first air cooler (71) and a first air cooler (91), the second defrosting valve assembly (82) is installed on a pipeline between the second valve assembly (72) and the second air cooler (92), the third defrosting valve assembly (83) is installed on a pipeline between the third valve assembly (73) and the third air cooler (93), the first defrosting valve assembly (81), the second defrosting valve assembly (82) and the third defrosting valve assembly (83) are sequentially connected to a water outlet pipeline and a water return pipeline of the heat preservation water tank (11), and the defrosting supply pump (12) is installed on the water outlet pipeline of the heat preservation water tank (11).
2. The refrigerator defrosting system using the exhaust working medium heat of the refrigerating unit as claimed in claim 1, wherein: timers are arranged inside the first air cooler (91), the second air cooler (92) and the third air cooler (93), and signal control lines of the timers are connected with the timers/timers of an s7-200 type programmable program controller of the PLC control cabinet (2) and used for respectively calculating the accumulated running time of the first air cooler (91), the second air cooler (92) and the third air cooler (93).
3. The refrigerator defrosting system using the exhaust working medium heat of the refrigerating unit as claimed in claim 1, wherein: the start-stop control lines of the heat exchange supply pump (10), the defrosting supply pump (12), the first valve assembly (71), the second valve assembly (72), the third valve assembly (73), the first defrosting valve assembly (81), the second defrosting valve assembly (82), the third defrosting valve assembly (83), the first air cooler (91), the second air cooler (92) and the third air cooler (93) are connected with an s7-200 type programmable program controller of the PLC control cabinet (2), and start and stop commands sent by the s7-200 type programmable program controller of the PLC control cabinet (2) are transmitted.
4. The refrigerator defrosting system using the exhaust working medium heat of the refrigerating unit as claimed in claim 1, wherein: a temperature sensor is arranged in the heat-preservation water tank (11), and the output end of the temperature sensor is connected with the input port of an s7-200 type programmable controller in the PLC control cabinet (2).
CN202220424051.7U 2022-03-01 2022-03-01 Utilize hot freezer defrosting system of refrigerating unit exhaust working medium Expired - Fee Related CN216868892U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220424051.7U CN216868892U (en) 2022-03-01 2022-03-01 Utilize hot freezer defrosting system of refrigerating unit exhaust working medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220424051.7U CN216868892U (en) 2022-03-01 2022-03-01 Utilize hot freezer defrosting system of refrigerating unit exhaust working medium

Publications (1)

Publication Number Publication Date
CN216868892U true CN216868892U (en) 2022-07-01

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