CN112197403A - Air cooler defrosting control method and device, storage medium and air cooler - Google Patents
Air cooler defrosting control method and device, storage medium and air cooler Download PDFInfo
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- CN112197403A CN112197403A CN202010885043.8A CN202010885043A CN112197403A CN 112197403 A CN112197403 A CN 112197403A CN 202010885043 A CN202010885043 A CN 202010885043A CN 112197403 A CN112197403 A CN 112197403A
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- evaporator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
Abstract
The invention provides an air cooler defrosting control method, device, storage medium and air cooler, wherein the method comprises the following steps: when the unit meets the defrosting condition, a control valve for controlling a refrigerant entering an evaporator from a compressor is closed, and the compressor is kept running continuously; detecting whether the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value or not; and when the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than the set pressure value, controlling the compressor to stop running, and starting the electric heating device to defrost the evaporator. The scheme provided by the invention can reduce the energy consumption of the whole defrosting process and reduce the temperature influence on the external refrigeration environment in the electric heating process.
Description
Technical Field
The invention relates to the field of control, in particular to an air cooler defrosting control method and device, a storage medium and an air cooler.
Background
In the application of the existing evaporator defrosting mode, the electric heating defrosting is a main evaporator defrosting mode. In the electric heating defrosting process of the evaporator, the temperature of a heating pipe is generally about 200 ℃, a large amount of heat can be emitted to be dissipated into a refrigeration house from the evaporator in the electric heating defrosting process, and meanwhile, when the defrosting process is started, a large amount of liquid refrigerant exists in the evaporator, a large amount of heat is absorbed to be gasified in the defrosting process, and the energy consumption in the defrosting process is increased.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides an air cooler defrosting control method, device, storage medium and air cooler to solve the problems that a large amount of liquid refrigerant exists in an evaporator when a defrosting process starts and a large amount of heat is absorbed in the defrosting process to increase energy consumption in the defrosting process in the prior art.
The invention provides an air cooler defrosting control method on the one hand, which comprises the following steps: when the unit meets the defrosting condition, a control valve for controlling a refrigerant entering an evaporator from a compressor is closed, and the compressor is kept running continuously; detecting whether the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value or not; and when the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than the set pressure value, controlling the compressor to stop running, and starting the electric heating device to defrost the evaporator.
Optionally, the method further comprises: after the electric heating device is started to defrost the evaporator, detecting the water flow at the water drain port of the water pan of the evaporator; controlling the electric heating device to work according to the detected water flow at the water outlet of the water receiving tray; and/or detecting the temperature of water in a water receiving tray of the evaporator after the electric heating device is started to defrost the evaporator; and controlling the electric heating device to work according to the detected temperature of the water in the evaporator water pan.
Optionally, controlling the operation of the electric heating device according to the detected water flow at the water outlet of the water receiving tray, including: when the water flow is detected to be increased or kept above a first preset flow value within a preset time period, controlling the electric heating device to maintain the current electric heating power; when the water flow is detected to be reduced or lower than a second preset flow value, controlling the electric heating power of the electric heating device to be reduced to a first preset power value; and when the water flow is detected to be lower than a third preset flow value, controlling the electric heating device to be closed.
Optionally, controlling the operation of the electric heating device according to the detected temperature of the water in the water pan comprises: when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold value, controlling the electric heating device to maintain the current electric heating power; and when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value.
In another aspect, the present invention provides a defrosting control apparatus, including: the first control unit is used for controlling a control valve of a refrigerant entering the evaporator from the compressor to be closed and keeping the compressor to continuously operate when the unit meets the defrosting condition; a first detection unit for detecting whether a pressure value at an outlet of the compressor or a pressure value in the evaporator is lower than a set pressure value; and the second control unit is used for controlling the compressor to stop running and starting the electric heating device to defrost the evaporator when the first detection unit detects that the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value.
Optionally, the method further comprises: the second detection unit is used for detecting the water flow at the water discharge port of the water receiving tray of the evaporator after the second control unit starts the electric heating device to defrost the evaporator; the third control unit is used for controlling the work of the electric heating device according to the water flow at the water outlet of the water receiving tray detected by the second detection unit; and/or the third detection unit is used for detecting the temperature of water in the water pan of the evaporator after the second control unit starts the electric heating device to defrost the evaporator; and the fourth control unit is used for controlling the electric heating device to work according to the temperature of the water in the evaporator water pan detected by the third detection unit.
Optionally, the third control unit controls the operation of the electric heating device according to the water flow rate at the water outlet of the water receiving tray detected by the second detection unit, and includes: when the water flow is detected to be increased or kept above a first preset flow value within a preset time period, controlling the electric heating device to maintain the current electric heating power; when the water flow is detected to be reduced or lower than a second preset flow value, controlling the electric heating power of the electric heating device to be reduced to a first preset power value; and when the water flow is detected to be lower than a third preset flow value, controlling the electric heating device to be closed.
Optionally, the fourth control unit, configured to control operation of the electric heating device according to the temperature of the water in the evaporator water pan detected by the third detection unit, includes: when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold value, controlling the electric heating device to maintain the current electric heating power; and when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
In a further aspect, the present invention provides an air cooler comprising a processor, a memory and a computer program stored on the memory and operable on the processor, wherein the processor executes the program to perform the steps of any one of the methods described above.
The invention further provides an air cooler which comprises any one of the defrosting control devices.
According to the technical scheme of the invention, a set is made to work for a preparation time before electrical heating defrosting is carried out under the defrosting condition, the compressor is made to continue working to transfer the refrigerant of the evaporator to the external unit, and the electrical heating defrosting is started after the consumption action of the refrigerant in the system is finished, so that the energy consumption caused by the absorption of heat by the refrigerant in the electrical heating defrosting stage is reduced. According to rivers change situation control electrical heating defrosting device, carry out the control to electrical heating time and intensity to this energy consumption of controlling electrical heating alleviates the in-process that carries out electrical heating to operational environment temperature's influence, can reduce the influence to ambient temperature in carrying out electrical heating defrosting, and reduces the energy loss that causes among the defrosting process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a method schematic diagram of an embodiment of an air cooler defrosting control method provided by the invention;
FIG. 2 is a method schematic diagram of another embodiment of an air cooler defrosting control method provided by the invention;
FIG. 3 is a method schematic diagram of a further embodiment of an air cooler defrosting control method provided by the present invention;
FIG. 4 is a method diagram of an embodiment of an air cooler defrosting control method according to the present invention;
FIG. 5 is a block diagram of an embodiment of an air cooler defrosting control device provided by the present invention;
FIG. 6 is a block diagram of another embodiment of an air cooler defrosting control device provided by the present invention;
fig. 7 is a block diagram illustrating a defrosting control apparatus for an air cooler according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a method schematic diagram of an embodiment of an air cooler defrosting control method provided by the invention.
As shown in fig. 1, according to an embodiment of the present invention, the defrosting control method includes at least step S110, step S120, and step S130.
And step S110, when the unit meets the defrosting condition, closing a control valve of a refrigerant entering an evaporator from the compressor, and keeping the compressor to continuously operate.
Step S120, detecting whether the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value.
And step S130, when the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than a set pressure value, controlling the compressor to stop running, and starting the electric heating device to defrost the evaporator.
Specifically, when the air cooler unit needs defrosting, the air cooler unit enters a defrosting preparation state, in the state, a control valve for controlling the refrigerant to flow from the compressor to the evaporator is closed, the compressor is kept running continuously, and the action is mainly to consume the refrigerant remaining in the evaporator.
After a control valve for controlling the refrigerant to be led to the evaporator from the compressor is closed, whether a pressure value at the outlet of the compressor or a pressure value in the evaporator is lower than a set pressure value or not is detected through a low-pressure sensor arranged at the outlet of the compressor or in the evaporator, wherein the set pressure value can be specifically a pressure value when the residual refrigerant in the evaporator is completely consumed. When the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than the set pressure value, the energy consumption caused by partial heat absorbed by a refrigerant in the electric heating defrosting process can be eliminated, at the moment, the electric heating defrosting stage is changed from the defrosting preparation stage, the compressor is controlled to stop running, and the electric heating device is started to defrost the evaporator. When the content of the refrigerant in the evaporator is higher through detecting the pressure value, the refrigerant of the evaporator can be transferred to an external machine through the continuous work of the compressor, so that the energy consumption caused by the heat absorption of the refrigerant in the electric heating defrosting stage is reduced.
Fig. 2 is a method schematic diagram of another embodiment of an air cooler defrosting control method provided by the invention. As shown in fig. 2, based on the above-described embodiment, according to another embodiment of the present invention, the defrosting control method further includes step S140 and step S150.
And step S140, after the electric heating device is started to defrost the evaporator, detecting the water flow at the water drain port of the water receiving tray of the evaporator.
And S150, controlling the electric heating device to work according to the detected water flow at the water outlet of the water pan.
After the electric heating device is started, the electric heating device such as an electric heating pipe starts to heat and defrost, the frost layer attached to the surface of the finned tube of the evaporator is melted into liquid under the action of electric heating, the liquid falls along the fin and enters the water receiving tray, and the liquid is discharged from a water outlet of the water receiving tray. The water flow at the water outlet of the water receiving tray of the evaporator is detected, the water flow at the water outlet of the water receiving tray, namely the flow of defrosting water, reflects the defrosting progress in the defrosting stage, and therefore the work of the electric heating device is controlled according to the detected water flow at the water outlet of the water receiving tray. The water flow change condition at the water outlet of the water receiving tray is detected, the flow passing through the cross section of the water receiving tray drainage channel in unit time can be detected through the flowmeter, or the pressure value of the defrosting water flowing through is detected at the L bend of the L drainage joint of the water receiving tray through the pressure sensor (the flow measurement is realized by utilizing the pressure difference generated when the defrosting water flows through the L bend).
Specifically, when the water flow is detected to be increased or kept above a first preset flow value within a preset time period, controlling the electric heating device to maintain the current electric heating power; and when the water flow is detected to be reduced or lower than a second preset flow value, controlling the electric heating power of the electric heating device to be reduced to a first preset power value, wherein the first preset power value is smaller than the rated power of the electric heating device. And when the water flow is detected to be lower than a third preset flow value, controlling the electric heating device to be closed.
More specifically, when the electric heating device starts to heat, the electric heating temperature is slowly increased to the maximum, at the moment, a frost layer on the surface of the finned tube of the evaporator is melted into water and guided into the water receiving tray, the water flow at the water outlet of the water receiving tray is detected, a feedback signal is triggered through the water flow, and when the detected water flow is slowly increased or is kept above a first preset flow value within a preset time period, the electric heating defrosting is in an early stage progress, so that the electric heating device is always in a working state; when the detected water flow is slowly reduced or is lower than a second preset flow value, the melting progress of the frost layer of the heat exchanger is reduced after reaching a peak value, and the residual frost layer is not enough as before, the electric heating intensity is reduced, the dissipation of defrosting heat is reduced, and the electric heating power is reduced and is lower than the rated power. When the water flow passing through the water outlet of the water receiving tray is detected to be intermittent (the water flow is lower than a third preset flow value), the defrosting of most frost layers of the heat exchanger is finished, and the residual partial small part of frost is dissolved, at the moment, the electric heating device can stop working, the residual frost in the evaporator is melted by means of the residual temperature of the electric heating pipe, and when the temperature of the electric heating device is recovered, the system starts normal refrigeration.
The first preset flow value is larger than the second preset flow value and larger than the third preset flow value. Taking a drainage hole with a circular section as an example, different flow rate values of drainage can be understood as follows: multiplying the flow cross-section flow velocity V of the water by the cross-section area A, namely Q & ltVA & gt, and when the inner diameter D is the circular tube, the flow Q & ltV & gt (3.14D & ltLambda & gt 2/4) is obtained, wherein the first preset flow value is preferably the maximum full flow value; the second preset flow rate value is preferably half the first preset flow rate value Q V (3.14D 2/8), when the flow rate of water is lower than half the maximum full flow rate value, the defrosting stage is considered to be completed for the most part, the electric heating power can be lower than the rated power, and when the third preset flow rate value is set to be Q V (3.14D 2/24), for example, the defrosting is considered to be basically completed, and the electric heating operation can be stopped.
Fig. 3 is a method schematic diagram of a defrosting control method for an air cooler according to still another embodiment of the invention. As shown in fig. 3, according to still another embodiment of the present invention, based on any of the above embodiments, the defrosting control method further includes step S160 and step S170.
And step S160, after the electric heating device is started to defrost the evaporator, detecting the temperature of water in the water pan of the evaporator.
And S170, controlling the electric heating device to work according to the detected temperature of the water in the water pan of the evaporator.
After the electric heating device is started, the electric heating device such as an electric heating pipe starts to heat up and defrost, the frost layer attached to the surface of the finned tube of the evaporator is melted into liquid under the action of electric heating, the liquid falls along the fin and enters the water receiving tray, and the liquid is discharged out of the air cooler through the water outlet of the water receiving tray. And detecting the temperature of the water in the water pan of the evaporator, and controlling the electric heating device to work according to the detected temperature of the water in the water pan. Specifically, when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold, controlling the electric heating device to maintain the current electric heating power; when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value, wherein the second preset power value is smaller than the rated power of the electric heating device. The temperature of the water in the water receiving tray of the evaporator, namely the temperature of the defrosting water, shows the defrosting intensity, and if the temperature of the defrosting water is higher than a certain value, the defrosting intensity is reduced for reducing heat dissipation, namely the electric heating power of the electric heating device is reduced. The preset temperature threshold is set to 10 ℃ for example, and when the temperature of the water in the water pan is detected to be less than or equal to 10 ℃, the electric heating device is controlled to maintain the current electric heating power; and when the temperature of the water in the water pan is detected to be higher than 10 ℃, controlling the electric heating power of the electric heating device to be reduced to a second preset power value.
In order to clearly illustrate the technical solution of the present invention, an implementation flow of the defrosting control method for an air cooler provided by the present invention is described below with an embodiment.
Fig. 4 is a method schematic diagram of an embodiment of an air cooler defrosting control method provided by the invention. As shown in fig. 4, when the unit receives a signal that defrosting is required, the unit enters a defrosting preparation state, a valve body of a refrigerant leading to an evaporator is closed, and a compressor is kept running to consume residual refrigerant in the evaporator, whether a pressure value at an outlet of the compressor or in the evaporator is lower than a set pressure value is detected, when the pressure value at the outlet of the compressor or in the evaporator is detected to be lower than the set low pressure value, energy consumption caused by partial heat absorbed by the refrigerant in the electric heating defrosting process can be eliminated, at this time, the unit enters an electric heating defrosting stage from the defrosting preparation stage, the electric heating defrosting is started, the electric heating pipe starts to heat up to defrost, a frost layer attached to the surface of a finned tube of the evaporator is melted into liquid to fall along the fin under the effect of electric heating, and the liquid is discharged through a water. When the water flow passing through the notch in the water receiving tray is detected to be gradually increased or maintain a first preset flow value, the electric heating is always in a working state, when the water flow passing through the notch in the water receiving tray is detected to be smaller and smaller or lower than a second preset flow value, the electric heating power is reduced and lower than the rated power, when the water flow passing through the notch in the water receiving tray is detected to be intermittent (lower than a third preset flow value), the electric heating is fed back to stop working, at the moment, the evaporator can melt residual frost in the evaporator by means of the residual temperature of the electric heating pipe, and when the temperature before the electric heating is recovered, the system can autonomously start the normal refrigeration state of the air cooler. Detecting the temperature of water in a water pan of the evaporator, and when the detected temperature of defrosting water is less than or equal to a preset temperature threshold value, maintaining the current electric heating defrosting intensity unchanged, namely the electric heating defrosting power unchanged; and when the temperature of the defrosting water is detected to be higher than a preset temperature threshold value, reducing the electric heating defrosting intensity, namely reducing the electric heating defrosting power.
Fig. 5 is a block diagram of an embodiment of an air cooler defrosting control device provided by the present invention. As shown in fig. 5, the defrosting control apparatus 100 includes a first control unit 110, a first detection unit 120, and a second control unit 130.
The first control unit 110 is configured to control a control valve of a refrigerant entering the evaporator from the compressor to be closed and keep the compressor running continuously when the unit meets a defrosting condition; the first detecting unit 120 is configured to detect whether a pressure value at an outlet of the compressor or a pressure value in the evaporator is lower than a set pressure value, where the set pressure value may be a pressure value when the remaining refrigerant in the evaporator is consumed. The second control unit 130 is configured to control the compressor to stop operating and start the electric heating device to defrost the evaporator when the first detection unit 120 detects that the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value.
Specifically, when the air cooler unit needs defrosting, the air cooler unit enters a defrosting preparation state, in which the first control unit 110 controls the control valve of the refrigerant leading from the compressor to the evaporator to be closed, and keeps the compressor running continuously, and this action is mainly to consume the refrigerant remaining in the evaporator.
After a control valve for controlling a refrigerant to flow from a compressor to an evaporator is closed, the first detection unit 120 detects whether a pressure value at an outlet of the compressor or a pressure value in the evaporator is lower than a set pressure value through a low-pressure sensor arranged at the outlet of the compressor or in the evaporator, when the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than the set pressure value, energy consumption caused by partial heat absorbed by the refrigerant in an electric heating defrosting process can be eliminated, at the moment, the electric heating defrosting stage is changed from a defrosting preparation stage to an electric heating defrosting stage, and the second control unit 130 controls the compressor to stop running and starts an electric heating device to defrost the evaporator. When the content of the refrigerant in the evaporator is higher through detecting the pressure value, the refrigerant of the evaporator can be transferred to an external machine through the continuous work of the compressor, so that the energy consumption caused by the heat absorption of the refrigerant in the electric heating defrosting stage is reduced.
Fig. 6 is a block diagram of another embodiment of an air cooler defrosting control device according to the present invention. As shown in fig. 6, based on the above-described embodiment, the defrosting control apparatus 100 further includes a second detecting unit 140 and a third controlling unit 150.
The second detection unit 140 is configured to detect a water flow rate at a drain of a water pan of the evaporator after the second control unit 130 turns on the electric heating device to defrost the evaporator; the third control unit 150 is configured to control the operation of the electric heating device according to the water flow rate at the water outlet of the water receiving tray detected by the second detection unit.
After the electric heating device is started, the electric heating device such as an electric heating pipe starts to heat and defrost, the frost layer attached to the surface of the finned tube of the evaporator is melted into liquid under the action of electric heating, the liquid falls along the fin and enters the water receiving tray, and the liquid is discharged from a water outlet of the water receiving tray. The second detecting unit 140 detects the water flow at the drain outlet of the water pan of the evaporator, and the water flow at the water outlet of the water pan, i.e., the flow of defrosting water, reflects the defrosting progress in the defrosting stage, so that the electric heating device is controlled to operate according to the detected water flow at the water outlet of the water pan. The water flow change condition at the water outlet of the water receiving tray is detected, the flow passing through the cross section of the water receiving tray drainage channel in unit time can be detected through the flowmeter, or the pressure value of the defrosting water flowing through is detected at the L bend of the L drainage joint of the water receiving tray through the pressure sensor (the flow measurement is realized by utilizing the pressure difference generated when the defrosting water flows through the L bend).
Specifically, when it is detected that the water flow rate is increased or kept above a first preset flow rate value for a preset time period, the third control unit 150 controls the electric heating device to maintain the current electric heating power; when it is detected that the water flow rate is reduced or is lower than a second preset flow rate value, the third control unit 150 controls the electric heating power of the electric heating device to be reduced to a first preset power value, wherein the first preset power value is smaller than the rated power of the electric heating device. When it is detected that the water flow is lower than a third preset flow value, the third control unit 150 controls the electric heating device to be turned off.
More specifically, when the electric heating device starts to heat, the electric heating temperature is slowly increased to the maximum, at the moment, a frost layer on the surface of the finned tube of the evaporator is melted into water and guided into the water receiving tray, the water flow at the water outlet of the water receiving tray is detected, a feedback signal is triggered through the water flow, and when the detected water flow is slowly increased or is kept above a first preset flow value within a preset time period, the electric heating defrosting is in an early stage progress, so that the electric heating device is always in a working state; when the detected water flow is slowly reduced or is lower than a second preset flow value), the melting progress of the frost layer of the heat exchanger is reduced after reaching a peak value, and the residual frost layer is not enough as before, so that the electric heating intensity is reduced, the dissipation of defrosting heat is reduced, and the electric heating power is reduced and is lower than the rated power. When the water flow passing through the water outlet of the water receiving tray is detected to be intermittent (the water flow is lower than a third preset flow value), the defrosting of most frost layers of the heat exchanger is finished, and the residual partial small part of frost is dissolved, at the moment, the electric heating device can stop working, the residual frost in the evaporator is melted by means of the residual temperature of the electric heating pipe, and when the temperature of the electric heating device is recovered, the system starts normal refrigeration.
The first preset flow value is larger than the second preset flow value and larger than the third preset flow value. Taking a drainage hole with a circular section as an example, different flow rate values of drainage can be understood as follows: multiplying the flow cross-section flow velocity V of the water by the cross-section area A, namely Q & ltVA & gt, and when the inner diameter D is the circular tube, the flow Q & ltV & gt (3.14D & ltLambda & gt 2/4) is obtained, wherein the first preset flow value is preferably the maximum full flow value; the second preset flow rate value is preferably half the first preset flow rate value Q V (3.14D 2/8), when the flow rate of water is lower than half the maximum full flow rate value, the defrosting stage is considered to be completed for the most part, the electric heating power can be lower than the rated power, and when the third preset flow rate value is set to be Q V (3.14D 2/24), for example, the defrosting is considered to be basically completed, and the electric heating operation can be stopped.
Fig. 7 is a block diagram illustrating a defrosting control apparatus for an air cooler according to still another embodiment of the present invention. As shown in fig. 7, according to any of the above embodiments, the defrosting control apparatus 100 further includes a third detecting unit 160 and a fourth controlling unit 170.
The third detecting unit 160 is configured to detect the temperature of water in the water pan of the evaporator after the second controlling unit 130 turns on the electric heating device to defrost the evaporator; the fourth control unit 170 is configured to control the operation of the electric heating device according to the temperature of the water in the water-receiving tray of the evaporator detected by the third detection unit 160.
After the electric heating device is started, the electric heating device such as an electric heating pipe starts to heat up and defrost, the frost layer attached to the surface of the finned tube of the evaporator is melted into liquid under the action of electric heating, the liquid falls along the fin and enters the water receiving tray, and the liquid is discharged out of the air cooler through the water outlet of the water receiving tray. And detecting the temperature of the water in the water pan of the evaporator, and controlling the electric heating device to work according to the detected temperature of the water in the water pan. Specifically, when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold, controlling the electric heating device to maintain the current electric heating power; when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value, wherein the second preset power value is smaller than the rated power of the electric heating device. The temperature of the water in the water receiving tray of the evaporator, namely the temperature of the defrosting water, shows the defrosting intensity, and if the temperature of the defrosting water is higher than a certain value, the defrosting intensity is reduced for reducing heat dissipation, namely the electric heating power of the electric heating device is reduced.
The invention also provides a storage medium corresponding to the air cooler defrosting control method, wherein a computer program is stored on the storage medium, and the program is executed by a processor to realize the steps of any one of the methods.
The invention also provides an air cooler corresponding to the defrosting control method of the air cooler, which comprises a processor, a memory and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides an air cooler corresponding to the air cooler defrosting control device, which comprises any one of the air cooler defrosting control devices.
Therefore, according to the scheme provided by the invention, the preparation time is provided for the unit to work before the electric heating defrosting is carried out under the defrosting condition, the refrigerant except the system is consumed, and the electric heating defrosting is started after the refrigerant in the system is consumed, so that the energy consumption caused by the heat absorption of the refrigerant in the electric heating defrosting stage is reduced. According to rivers change situation control electrical heating defrosting device, carry out the control to electrical heating time and intensity to this energy consumption of controlling electrical heating alleviates the in-process that carries out electrical heating to operational environment temperature's influence, can reduce the influence to ambient temperature in carrying out electrical heating defrosting, and reduces the energy loss that causes among the defrosting process.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The defrosting control method for the air cooler is characterized by comprising the following steps of:
when the unit meets the defrosting condition, a control valve for controlling a refrigerant entering an evaporator from a compressor is closed, and the compressor is kept running continuously;
detecting whether the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value or not;
and when the pressure value at the outlet of the compressor or the pressure value in the evaporator is detected to be lower than the set pressure value, controlling the compressor to stop running, and starting the electric heating device to defrost the evaporator.
2. The method of claim 1, further comprising:
after the electric heating device is started to defrost the evaporator, detecting the water flow at the water drain port of the water pan of the evaporator;
controlling the electric heating device to work according to the detected water flow at the water outlet of the water receiving tray;
and/or the presence of a gas in the gas,
after the electric heating device is started to defrost the evaporator, detecting the temperature of water in a water pan of the evaporator;
and controlling the electric heating device to work according to the detected temperature of the water in the evaporator water pan.
3. The method as claimed in claim 2, wherein controlling the operation of the electric heating device according to the detected water flow at the water outlet of the water pan comprises:
when the water flow is detected to be increased or kept above a first preset flow value within a preset time period, controlling the electric heating device to maintain the current electric heating power;
when the water flow is detected to be reduced or lower than a second preset flow value, controlling the electric heating power of the electric heating device to be reduced to a first preset power value;
and when the water flow is detected to be lower than a third preset flow value, controlling the electric heating device to be closed.
4. A method as claimed in claim 2 or 3, wherein controlling the operation of the electrical heating means in dependence on the detected temperature of the water in the drip tray comprises:
when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold value, controlling the electric heating device to maintain the current electric heating power;
and when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value.
5. The utility model provides an air-cooler defrosting control device which characterized in that includes:
the first control unit is used for controlling a control valve of a refrigerant entering the evaporator from the compressor to be closed and keeping the compressor to continuously operate when the unit meets the defrosting condition;
a first detection unit for detecting whether a pressure value at an outlet of the compressor or a pressure value in the evaporator is lower than a set pressure value;
and the second control unit is used for controlling the compressor to stop running and starting the electric heating device to defrost the evaporator when the first detection unit detects that the pressure value at the outlet of the compressor or the pressure value in the evaporator is lower than a set pressure value.
6. The apparatus of claim 5, further comprising:
the second detection unit is used for detecting the water flow at the water discharge port of the water receiving tray of the evaporator after the second control unit starts the electric heating device to defrost the evaporator;
the third control unit is used for controlling the work of the electric heating device according to the water flow at the water outlet of the water receiving tray detected by the second detection unit;
and/or the presence of a gas in the gas,
the third detection unit is used for detecting the temperature of water in the water pan of the evaporator after the second control unit starts the electric heating device to defrost the evaporator;
and the fourth control unit is used for controlling the electric heating device to work according to the temperature of the water in the evaporator water pan detected by the third detection unit.
7. The device as claimed in claim 6, wherein the third control unit controls the operation of the electric heating device according to the water flow rate at the water outlet of the water receiving tray detected by the second detection unit, and comprises:
when the water flow is detected to be increased or kept above a first preset flow value within a preset time period, controlling the electric heating device to maintain the current electric heating power;
when the water flow is detected to be reduced or lower than a second preset flow value, controlling the electric heating power of the electric heating device to be reduced to a first preset power value;
and when the water flow is detected to be lower than a third preset flow value, controlling the electric heating device to be closed.
8. The apparatus according to claim 6 or 7, wherein the fourth control unit controls the operation of the electric heating apparatus according to the temperature of the water in the evaporator water-receiving tray detected by the third detection unit, and comprises:
when the temperature of the water in the water pan is detected to be less than or equal to a preset temperature threshold value, controlling the electric heating device to maintain the current electric heating power;
and when the temperature of the water in the water pan is detected to be higher than a preset temperature threshold value, controlling the electric heating power of the electric heating device to be reduced to a second preset power value.
9. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
10. An air cooler comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, the processor implementing the steps of the method of any one of claims 1 to 4 when executing the program, or comprising the air cooler defrosting control apparatus of any one of claims 5 to 8.
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| CN202010885043.8A CN112197403A (en) | 2020-08-28 | 2020-08-28 | Air cooler defrosting control method and device, storage medium and air cooler |
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| CN202010885043.8A CN112197403A (en) | 2020-08-28 | 2020-08-28 | Air cooler defrosting control method and device, storage medium and air cooler |
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Cited By (1)
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