CN116697651A - Method and device for determining abnormality of four-way valve of refrigerating unit - Google Patents

Method and device for determining abnormality of four-way valve of refrigerating unit Download PDF

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Publication number
CN116697651A
CN116697651A CN202310837447.3A CN202310837447A CN116697651A CN 116697651 A CN116697651 A CN 116697651A CN 202310837447 A CN202310837447 A CN 202310837447A CN 116697651 A CN116697651 A CN 116697651A
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CN
China
Prior art keywords
temperature
preset
refrigeration house
refrigerating unit
way valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310837447.3A
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Chinese (zh)
Inventor
王倩
赖海龙
董子祺
吴婉君
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Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202310837447.3A priority Critical patent/CN116697651A/en
Publication of CN116697651A publication Critical patent/CN116697651A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

The application relates to a method and a device for determining abnormality of a four-way valve of a refrigerating unit, wherein the method comprises the following steps: after the compressor of the refrigerating unit runs for a set period of time, the condensing temperature and the outer ring temperature of the refrigerating unit are obtained; if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, controlling a four-way valve to be powered on and then powered off, wherein the four-way valve is used for adjusting the flow direction of a refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode; controlling the compressor to run for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period; and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature. The method improves the accuracy of four-way valve abnormality determination.

Description

Method and device for determining abnormality of four-way valve of refrigerating unit
Technical Field
The application relates to the field of refrigerating units, in particular to a method and a device for determining abnormality of a four-way valve of a refrigerating unit.
Background
At present, the temperature required by the use side of a refrigerating unit for a refrigeration house is extremely low (generally below-20 ℃), and if the humidity in the refrigeration house is high, the evaporator can be severely frosted. Thus, although a single chiller unit, the chiller unit still requires a defrosting function for defrosting the use side evaporator. The traditional refrigerating unit generally uses an electric heating defrosting mode, and although defrosting efficiency is very high, electricity consumption is greatly increased, and the cost is greatly increased when the unit is installed in a refrigeration house with serious humidity and frequent defrosting.
The emerging heat pump defrosting unit finishes defrosting by means of a method that the four-way valve changes the flow direction of a refrigerant, does not cause great increase of electricity consumption, and can solve the problem, but the problem brought by the method is that if the four-way valve is abnormal in reversing, the unit can be caused to continuously heat a cold storage, and the temperature of the cold storage is increased to damage goods.
The conventional heat pump defrosting and refrigerating unit generally uses a system temperature sensor to perform temperature comparison to judge whether a four-way valve is abnormal, for example, if the temperature difference between the air supply temperature and the warehouse temperature is abnormal, the four-way valve is judged to be abnormal, but the warehouse temperature is easy to be influenced by opening, closing and loading and unloading of a refrigerator, so that the judgment of the abnormality of the four-way valve is easy to be inaccurate (the abnormality is influenced by actual use by other temperature differences), the unit can be ensured to operate to the greatest extent, the unit is generally not stopped even if the abnormality of the four-way valve is detected, only faults are displayed to wait for workers to find and overhaul, or the four-way valve is repeatedly started after stopping, and the temperature is repeatedly restarted and stopped again for locking after stopping, so that the temperature of the warehouse is inevitably higher than the required temperature in the process, and loss is caused.
Aiming at the problem of inaccurate judgment of the abnormality of the four-way valve, no good solution exists at present.
Disclosure of Invention
The application provides a method and a device for determining abnormality of a four-way valve of a refrigerating unit, which are used for solving the problem of inaccurate judgment of the abnormality of the four-way valve.
In a first aspect, the present application provides a method for determining abnormality of a four-way valve of a refrigeration unit, the method comprising:
after a compressor of a refrigerating unit runs for a set period of time, acquiring the condensation temperature and the outer ring temperature of the refrigerating unit;
if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, controlling a four-way valve to be powered on and then powered off, wherein the four-way valve is used for adjusting the flow direction of a refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
controlling the compressor to run for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature.
Further, obtaining the air supply temperature of the refrigerating unit within the preset time period includes: acquiring a first average air supply temperature in a first half period and a second average air supply temperature in a second half period in the preset period;
the air supply temperature meeting the temperature rising condition includes: the temperature difference between the second average air supply temperature and the first average air supply temperature is larger than a preset temperature difference.
Further, obtaining the temperature of the refrigerator within the preset time period includes: acquiring an initial refrigeration house temperature at an initial time and a final refrigeration house temperature at a final time within the preset time;
the refrigerator temperature is higher than a preset refrigerator temperature, and comprises: the final refrigeration house temperature is greater than the initial refrigeration house temperature.
Further, obtaining the temperature of the refrigerator within the preset time period includes: acquiring the final temperature of the refrigeration house at the tail end moment in the preset time;
the refrigerator temperature is higher than a preset refrigerator temperature, and comprises: the final refrigeration house temperature is greater than the preset maximum refrigeration house temperature.
Further, before the compressor is operated at the maximum frequency for a preset period of time, the method further includes:
acquiring a preset maximum refrigeration house temperature, wherein the maximum refrigeration house temperature is set according to the maximum preservation temperature of goods stored in the refrigeration house;
determining a set preservation temperature according to the highest refrigeration house temperature, wherein the set preservation temperature is smaller than the highest refrigeration house temperature, and the temperature difference between the set preservation temperature and the highest refrigeration house temperature is a target temperature difference;
controlling the refrigerating unit to adopt a defrosting mode and run at the highest frequency aiming at the minimum volume refrigeration house applicable to the refrigerating unit so as to enable the minimum volume refrigeration house to be lowered from the current temperature to the set preservation temperature;
and taking the time length of the minimum volume refrigeration house reaching the set preservation temperature as the preset time length.
Further, before determining that the temperature difference between the second average supply air temperature and the first average supply air temperature is greater than a preset temperature difference, the method further includes:
controlling the refrigerating unit to run from the starting temperature to the target temperature at the highest frequency aiming at the minimum-volume refrigeration house applicable to the refrigerating unit, and determining the fluctuation value of the air supply temperature;
and taking the maximum fluctuation value as the preset temperature difference.
Further, controlling the compressor to run for a preset period of time includes:
and controlling the compressor to operate at the maximum frequency for a preset period of time.
In a second aspect, the present application provides a device for determining abnormality of a four-way valve of a refrigeration unit, the device comprising:
the first acquisition module is used for acquiring the condensation temperature and the outer ring temperature of the refrigerating unit after the compressor of the refrigerating unit runs for a set period of time;
the control module is used for controlling the four-way valve to be powered down after being powered up if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, wherein the four-way valve is used for adjusting the flow direction of a refrigerant to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
the second acquisition module is used for controlling the compressor to run for a preset time period and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and the determining module is used for determining that the four-way valve is abnormal if at least one of the following preset conditions is met, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature.
In a third aspect, the present application provides a refrigeration unit comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; at least one memory coupled to the at least one bus, wherein the processor is configured to implement a method of determining a refrigeration unit four-way valve anomaly, the method comprising:
after the compressor of the refrigerating unit runs for a set period of time, the condensing temperature and the outer ring temperature of the refrigerating unit are obtained;
if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, controlling a four-way valve to be powered on and then powered off, wherein the four-way valve is used for adjusting the flow direction of a refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
controlling the compressor to run for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature.
In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions for executing the method for determining an abnormality of a four-way valve of a refrigeration unit according to any one of the above aspects of the present application.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: if the temperature difference between the outer ring temperature and the condensing temperature is larger than the set difference, the four-way valve is controlled to be powered off after being powered on, the recoverable abnormal condition is eliminated, and after the condensing unit operates for a preset period of time, if the temperature in the refrigerator is still determined to be high according to the air supply temperature or the refrigerator temperature, the four-way valve is indicated to be abnormal. The application adopts the outer ring temperature and the condensation temperature which are less influenced by the actual use of the cold storage, reduces the influence of the actual use of the cold storage on the temperature in the calculation process, and ensures the accuracy of the abnormality detection of the four-way valve.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a flowchart of a method for determining abnormality of a four-way valve of a refrigeration unit according to an embodiment of the present application;
FIG. 2 is a schematic illustration of a Tmax-t curve provided by an embodiment of the present application;
FIG. 3 is a flowchart of a method for determining abnormality of a four-way valve of a refrigeration unit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a device for determining abnormality of a four-way valve of a refrigeration unit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
The application provides a method for determining abnormality of a four-way valve of a refrigerating unit, which can be applied to a controller of the refrigerating unit and is used for accurately detecting whether the four-way valve of the refrigerating unit is abnormal or not, as shown in figure 1, and specifically comprises the following steps:
step 101: and after the compressor of the refrigerating unit operates for a set period of time, acquiring the condensation temperature and the outer ring temperature of the refrigerating unit.
In the embodiment of the application, after the compressor of the refrigerating unit normally runs for a set period of time, the temperature of the outer ring is obtained through an outer machine temperature sensor on the outer machine, and the condensing temperature is obtained through a condensing temperature sensor on the refrigerating unit. The set time period may be three minutes, and the present application is not particularly limited. The refrigerating unit can also be a condensing unit.
Step 102: if the temperature difference between the outer ring temperature and the condensing temperature is larger than the set difference, the four-way valve is controlled to be powered up and then powered down.
The four-way valve is used for adjusting the flow direction of the refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode.
The temperature of the outer ring, namely the external environment, is not influenced by the actual use of the refrigeration house, the condensation temperature is related to the refrigeration or heating of the compressor, and the temperature variation is not large due to the actual use of the refrigeration house, so that the outer ring temperature and the condensation temperature are selected for judgment.
In the refrigerating process of the compressor, the condenser is in a heating mode, the temperature is higher, if the temperature difference between the temperature of the outer ring and the condensing temperature is larger than the set difference, namely the temperature of the outer ring-condensing temperature is larger than the set difference DeltaT, the condensing temperature is lower, the compressor possibly heats, the situation that the four-way valve is abnormal in reversing is judged, the four-way valve is controlled by the controller to be powered off after being electrified for a period of time (the four-way valve is in a power-off state when the compressor is refrigerated), so that the four-way valve retries reversing once, and some recoverable abnormal situations are eliminated. The four-way valve can be electrified for 2 seconds, and the four-way valve can be ensured to commutate once again.
Step 103: and controlling the compressor to run for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period.
And after the four-way valve is electrified and then powered off, controlling the compressor to run for a preset time, and acquiring the air supply temperature of the refrigerating unit in real time through a temperature sensor or acquiring the temperature of a refrigeration house through the temperature sensor in the running process of the compressor.
Preferably, the controller can control the compressor to run for a preset time period at the maximum power, and the compressor runs at the maximum power, so that the cooling rate of the air supply temperature and the temperature of the refrigeration house can be maximized, and the temperature sensor can detect the temperature change more quickly, so that the four-way valve abnormality can be detected more quickly.
Step 104: and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets the temperature rising condition or that the temperature of the refrigeration house is higher than the preset storage temperature.
If the refrigerating unit determines that the air supply temperature meets the temperature rising condition, the temperature of the refrigeration house continuously rises to easily damage goods in the refrigeration house due to overhigh temperature, and the four-way valve is abnormal; or the refrigerating unit determines that the temperature of the refrigeration house is higher than the preset refrigeration house temperature, so that the temperature in the refrigeration house is too high, goods in the refrigeration house are easy to damage, and the four-way valve is abnormal. In order to prevent false detection, the refrigerating unit can also determine that the four-way valve is abnormal after determining that the air supply temperature meets the temperature rising condition and the temperature of the refrigeration house is higher than the preset temperature, and can send an alarm to inform staff at the moment and control the refrigerating unit to stop.
In the application, if the temperature difference between the outer ring temperature and the condensing temperature is larger than the set difference, the four-way valve is controlled to be powered on and then powered off, the restorable abnormal condition is eliminated, and after the condensing unit operates for a preset period of time, if the temperature in the cold storage is still determined to be high according to the air supply temperature or the storage temperature, the four-way valve is indicated to be abnormal. The application adopts the outer ring temperature and the condensation temperature which are less influenced by the actual use of the cold storage, reduces the influence of the actual use of the cold storage on the temperature in the calculation process, and ensures the accuracy of the abnormality detection of the four-way valve.
In addition, the four-way valve is controlled to be powered off after being powered on, so that some recoverable abnormal conditions are eliminated, maintenance of workers is not needed, and user experience is improved.
As an alternative embodiment, the method for determining the preset time period by the controller includes: acquiring a preset maximum refrigeration house temperature, wherein the maximum refrigeration house temperature is set according to the maximum preservation temperature of goods stored in the refrigeration house; determining a set preservation temperature according to the highest refrigeration house temperature, wherein the set preservation temperature is smaller than the highest refrigeration house temperature, and the temperature difference between the set preservation temperature and the highest refrigeration house temperature is the target temperature difference; the method comprises the steps of controlling a refrigerating unit to adopt a defrosting mode and run at the highest frequency aiming at the smallest-volume refrigeration house applicable to the refrigerating unit, so that the smallest-volume refrigeration house is reduced from the current temperature to the set preservation temperature; and taking the time length of the minimum volume refrigeration house reaching the set preservation temperature as the preset time length.
The controller determines the highest temperature of the refrigeration house in the current refrigeration house, wherein the highest temperature of the refrigeration house is determined according to the highest preservation temperature of the stored goods in the refrigeration house, a user can input the type of the goods, the controller automatically determines the highest preservation temperature according to the type of the goods, the user can also input the highest preservation temperature according to the type of the goods, and the controller obtains the highest preservation temperature.
The controller determines the minimum volume refrigeration house suitable for the refrigerating unit, the refrigeration house is minimum in volume, the temperature change in the refrigeration house reaches the extremum, and the scheme is suitable for the refrigeration house with the minimum volume, and is also suitable for refrigeration houses with other volumes.
For the minimum volume refrigeration house, the controller controls the refrigeration unit to adopt a defrosting (heating) mode and run at the highest frequency, so that the minimum volume refrigeration house is reduced from the current temperature to the set preservation temperature, and the time length of the minimum volume refrigeration house reaching the set preservation temperature is taken as the preset time length. Because the minimum volume refrigeration house is in the limit value at the highest refrigeration house temperature, the determination of the time length is inaccurate, and the application adopts the set preservation temperature slightly lower than the highest refrigeration house temperature, thereby improving the accuracy of the determination of the preset time length.
As shown in FIG. 2, FIG. 2 is a graph of Tmax-t between the maximum freezer temperature (Tmax) C, the set storage temperature (Tmax-2) C, and the preset time period t. The time t can be determined from (Tmax-2): the unit adopts an applicable minimum refrigeration house, adopts a defrosting (heating) mode and adopts a time period t for reaching (Tmax-2) DEG C from the current temperature at the highest frequency to determine a Tmax-t curve.
As an alternative embodiment, the mode position of the four-way valve abnormality is determined according to the supply air temperature: acquiring a first average air supply temperature in a first half period and a second average air supply temperature in a second half period in a preset period; the temperature difference between the second average supply air temperature and the first average supply air temperature is greater than a preset temperature difference.
The controller divides the preset time length into a first half time length and a second half time length, obtains a first average air supply temperature in the first half time length and a second average air supply temperature in the second half time length, and determines that the four-way valve is abnormal if the temperature difference between the second average air supply temperature and the first average air supply temperature is detected to be larger than the preset temperature difference, which indicates that the air supply temperature is always and excessively fast to rise.
The preset time period is exemplified by t minutes, and if the average value of the air supply temperature in the following 1/2 time in t minutes is higher than the average value of the air supply temperature in the previous 1/2 time by more than the preset temperature difference TA ℃, the air supply temperature is indicated to be always rising.
The determination mode of the preset temperature TA ℃ is as follows: the controller determines a minimum-volume refrigeration house suitable for the refrigeration unit, in the minimum-volume refrigeration house, the refrigeration unit is controlled to run from the starting temperature to the target temperature at the highest frequency, and then the fluctuation value of the air supply temperature is determined, wherein the target temperature is the common temperature of the refrigeration house, the air supply temperature fluctuates in the process that the refrigeration unit controls the refrigeration house to reach the target temperature, and the controller takes the maximum fluctuation value as a preset temperature difference.
As an alternative implementation, the method for determining the abnormality of the four-way valve according to the temperature of the refrigeration house comprises two examples.
In one embodiment, the controller determines an initial time and a final time within a preset time period, obtains an initial freezer temperature at the initial time and a final freezer temperature at the final time, and determines that the four-way valve is abnormal if the final freezer temperature is greater than the initial freezer temperature, indicating that the freezer temperature is rising.
In another embodiment, the controller obtains the final freezer temperature at the end of the preset time period, and if the final freezer temperature is greater than the preset maximum freezer temperature, indicating that the freezer temperature is too high, the four-way valve is abnormal.
Fig. 3 is a schematic diagram of a flow chart for determining abnormality of a four-way valve of a refrigerating unit.
Based on the same technical conception, the application also provides a device for determining abnormality of the four-way valve of the refrigerating unit, as shown in fig. 4, the device comprises:
a first obtaining module 401, configured to obtain a condensation temperature and an outer ring temperature of the refrigeration unit after a set period of operation of a compressor of the refrigeration unit;
the control module 402 is configured to control the four-way valve to be powered down after the four-way valve is powered up if the temperature difference between the outer ring temperature and the condensation temperature is greater than a set difference, where the four-way valve is configured to adjust a refrigerant flow direction to switch the refrigerating unit between a refrigerating mode and a defrosting mode;
the second obtaining module 403 is configured to control the compressor to run for a preset period of time, and obtain an air supply temperature or a cold storage temperature of the refrigerating unit within the preset period of time;
and a determining module 404, configured to determine that the four-way valve is abnormal if at least one of the following preset conditions is satisfied, where the preset conditions include that the air supply temperature satisfies a temperature rising condition or that the temperature of the refrigerator is higher than a preset storage temperature.
Optionally, the second obtaining module 403 is configured to obtain a first average air supply temperature in a first half period and a second average air supply temperature in a second half period in the preset period;
the determining module 404 is configured to determine that a temperature difference between the second average supply air temperature and the first average supply air temperature is greater than a preset temperature difference.
Optionally, the second obtaining module 403 is configured to obtain an initial refrigeration house temperature at an initial time and a final refrigeration house temperature at a final time within a preset duration;
a determination module 404 for the final freezer temperature to be greater than the initial freezer temperature.
Optionally, a second obtaining module 403 is configured to obtain a final temperature of the refrigerator at a terminal moment within a preset duration;
a determining module 404, configured to determine that the final freezer temperature is greater than the preset maximum freezer temperature.
Optionally, the device is further configured to:
acquiring a preset maximum refrigeration house temperature, wherein the maximum refrigeration house temperature is set according to the maximum preservation temperature of goods stored in the refrigeration house;
determining a set preservation temperature according to the highest refrigeration house temperature, wherein the set preservation temperature is smaller than the highest refrigeration house temperature, and the temperature difference between the set preservation temperature and the highest refrigeration house temperature is the target temperature difference;
the method comprises the steps of controlling a refrigerating unit to adopt a defrosting mode and run at the highest frequency aiming at the smallest-volume refrigeration house applicable to the refrigerating unit, so that the smallest-volume refrigeration house is reduced from the current temperature to the set preservation temperature;
and taking the time length of the minimum volume refrigeration house reaching the set preservation temperature as the preset time length.
Optionally, the device is further configured to:
controlling the refrigerating unit to run from the starting temperature to the target temperature at the highest frequency aiming at the minimum-volume refrigeration house applicable to the refrigerating unit, and determining the fluctuation value of the air supply temperature;
and taking the maximum fluctuation value as a preset temperature difference.
Optionally, the second obtaining module 403 is configured to control the compressor to operate at the maximum frequency for a preset period of time.
As shown in fig. 5, an embodiment of the present application provides a refrigeration unit, which includes a processor 501, a communication interface 502, a memory 503, and a communication bus 504, where the processor 501, the communication interface 502, and the memory 503 complete communication with each other through the communication bus 504;
a memory 503 for storing a computer program;
in one embodiment of the present application, the processor 501 is configured to implement the method for determining an abnormality of a four-way valve of a refrigeration unit according to any one of the foregoing method embodiments when executing a program stored in the memory 503, where the method includes:
after the compressor of the refrigerating unit runs for a set period of time, the condensing temperature and the outer ring temperature of the refrigerating unit are obtained;
if the temperature difference between the outer ring temperature and the condensation temperature is larger than the set difference, controlling the four-way valve to be powered on and then powered off, wherein the four-way valve is used for adjusting the flow direction of the refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
controlling the operation of the compressor for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets the temperature rising condition or that the temperature of the refrigeration house is higher than the preset storage temperature.
Further, obtaining the air supply temperature of the refrigerating unit within the preset duration includes: acquiring a first average air supply temperature in a first half period and a second average air supply temperature in a second half period in a preset period;
the air supply temperature meeting the temperature rising condition includes: the temperature difference between the second average supply air temperature and the first average supply air temperature is greater than a preset temperature difference.
Further, obtaining the temperature of the refrigeration house within the preset time period comprises the following steps: acquiring initial cold storage temperature at initial time and final cold storage temperature at tail end time in preset duration;
the refrigerator temperature is higher than a preset refrigerator temperature, including: the final freezer temperature is greater than the initial freezer temperature.
Further, obtaining the temperature of the refrigeration house within the preset time period comprises the following steps: acquiring the final temperature of a cold storage at the tail end moment within a preset time length;
the refrigerator temperature is higher than a preset refrigerator temperature, including: the final temperature of the refrigeration house is larger than the preset highest refrigeration house temperature.
Further, before the compressor is operated at the maximum frequency for a preset period of time, the method further includes:
acquiring a preset maximum refrigeration house temperature, wherein the maximum refrigeration house temperature is set according to the maximum preservation temperature of goods stored in the refrigeration house;
determining a set preservation temperature according to the highest refrigeration house temperature, wherein the set preservation temperature is smaller than the highest refrigeration house temperature, and the temperature difference between the set preservation temperature and the highest refrigeration house temperature is the target temperature difference;
the method comprises the steps of controlling a refrigerating unit to adopt a defrosting mode and run at the highest frequency aiming at the smallest-volume refrigeration house applicable to the refrigerating unit, so that the smallest-volume refrigeration house is reduced from the current temperature to the set preservation temperature;
and taking the time length of the minimum volume refrigeration house reaching the set preservation temperature as the preset time length.
Further, before determining that the temperature difference between the second average supply air temperature and the first average supply air temperature is greater than the preset temperature difference, the method further includes:
controlling the refrigerating unit to run from the starting temperature to the target temperature at the highest frequency aiming at the minimum-volume refrigeration house applicable to the refrigerating unit, and determining the fluctuation value of the air supply temperature;
and taking the maximum fluctuation value as a preset temperature difference.
Further, controlling the compressor to run for a preset period of time includes:
the compressor is controlled to operate at a maximum frequency for a preset period of time.
The embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the method for determining the abnormality of the four-way valve of the refrigerating unit provided by any one of the method embodiments when being executed by a processor.
The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, or may be implemented by hardware. Based on such understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the related art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the respective embodiments or some parts of the embodiments.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The foregoing is merely exemplary of embodiments of the present application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for determining an anomaly of a four-way valve of a refrigeration unit, the method comprising:
after a compressor of a refrigerating unit runs for a set period of time, acquiring the condensation temperature and the outer ring temperature of the refrigerating unit;
if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, controlling a four-way valve to be powered on and then powered off, wherein the four-way valve is used for adjusting the flow direction of a refrigerant so as to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
controlling the compressor to run for a preset time period, and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and if at least one of the following preset conditions is met, determining that the four-way valve is abnormal, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the obtaining the air supply temperature of the refrigerating unit within the preset time period comprises the following steps: acquiring a first average air supply temperature in a first half period and a second average air supply temperature in a second half period in the preset period;
the air supply temperature meeting the temperature rising condition includes: the temperature difference between the second average air supply temperature and the first average air supply temperature is larger than a preset temperature difference.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the obtaining of the temperature of the refrigeration house within the preset time length comprises the following steps: acquiring an initial refrigeration house temperature at an initial time and a final refrigeration house temperature at a final time within the preset time;
the refrigerator temperature is higher than a preset refrigerator temperature, and comprises: the final refrigeration house temperature is greater than the initial refrigeration house temperature.
4. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the obtaining of the temperature of the refrigeration house within the preset time length comprises the following steps: acquiring the final temperature of the refrigeration house at the tail end moment in the preset time;
the refrigerator temperature is higher than a preset refrigerator temperature, and comprises: the final refrigeration house temperature is greater than the preset maximum refrigeration house temperature.
5. The method of claim 1, wherein prior to the compressor operating at the maximum frequency for a preset period of time, the method further comprises:
acquiring a preset maximum refrigeration house temperature, wherein the maximum refrigeration house temperature is set according to the maximum preservation temperature of goods stored in the refrigeration house;
determining a set preservation temperature according to the highest refrigeration house temperature, wherein the set preservation temperature is smaller than the highest refrigeration house temperature, and the temperature difference between the set preservation temperature and the highest refrigeration house temperature is a target temperature difference;
controlling the refrigerating unit to adopt a defrosting mode and run at the highest frequency aiming at the minimum volume refrigeration house applicable to the refrigerating unit so as to enable the minimum volume refrigeration house to be lowered from the current temperature to the set preservation temperature;
and taking the time length of the minimum volume refrigeration house reaching the set preservation temperature as the preset time length.
6. The method of claim 2, wherein prior to determining that the temperature difference between the second average supply air temperature and the first average supply air temperature is greater than a predetermined temperature difference, the method further comprises:
controlling the refrigerating unit to run from the starting temperature to the target temperature at the highest frequency aiming at the minimum-volume refrigeration house applicable to the refrigerating unit, and determining the fluctuation value of the air supply temperature;
and taking the maximum fluctuation value as the preset temperature difference.
7. The method of claim 1, wherein controlling the compressor operation preset time period comprises:
and controlling the compressor to operate at the maximum frequency for a preset period of time.
8. A device for determining abnormality of a four-way valve of a refrigeration unit, the device comprising:
the first acquisition module is used for acquiring the condensation temperature and the outer ring temperature of the refrigerating unit after the compressor of the refrigerating unit runs for a set period of time;
the control module is used for controlling the four-way valve to be powered down after being powered up if the temperature difference between the outer ring temperature and the condensation temperature is larger than a set difference, wherein the four-way valve is used for adjusting the flow direction of a refrigerant to realize the switching of the refrigerating unit between a refrigerating mode and a defrosting mode;
the second acquisition module is used for controlling the compressor to run for a preset time period and acquiring the air supply temperature or the cold storage temperature of the refrigerating unit within the preset time period;
and the determining module is used for determining that the four-way valve is abnormal if at least one of the following preset conditions is met, wherein the preset conditions comprise that the air supply temperature meets a temperature rising condition or that the temperature of the cold storage is higher than a preset storage temperature.
9. The refrigerating unit is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the method of any of claims 1-7 when executing a program stored on a memory.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, implements the method of any of claims 1-7.
CN202310837447.3A 2023-07-07 2023-07-07 Method and device for determining abnormality of four-way valve of refrigerating unit Pending CN116697651A (en)

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CN202310837447.3A CN116697651A (en) 2023-07-07 2023-07-07 Method and device for determining abnormality of four-way valve of refrigerating unit

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117490188A (en) * 2023-12-25 2024-02-02 珠海格力电器股份有限公司 Four-way valve fault detection result generation method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117490188A (en) * 2023-12-25 2024-02-02 珠海格力电器股份有限公司 Four-way valve fault detection result generation method and device
CN117490188B (en) * 2023-12-25 2024-04-05 珠海格力电器股份有限公司 Four-way valve fault detection result generation method and device

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