CN110657563A - Control method and device for low-temperature heating unit and multi-split air conditioner - Google Patents
Control method and device for low-temperature heating unit and multi-split air conditioner Download PDFInfo
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- CN110657563A CN110657563A CN201910950297.0A CN201910950297A CN110657563A CN 110657563 A CN110657563 A CN 110657563A CN 201910950297 A CN201910950297 A CN 201910950297A CN 110657563 A CN110657563 A CN 110657563A
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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
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor 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
- F24F11/50—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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The invention discloses a control method and device of a low-temperature heating unit and multi-split equipment. Wherein, the method comprises the following steps: when the unit is in a heating standby mode, judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time; if yes, controlling the unit to enter a defrosting mode; and in the process of operating the defrosting mode by the unit, if the unit meets the normal heating starting condition, controlling the unit to enter a normal heating mode. According to the invention, before the unit which is standby in a low-temperature environment operates in a normal heating mode, the defrosting mode is started, the liquid refrigerant in the outdoor heat exchanger is pushed into the indoor heat exchanger with higher temperature, indoor heat is absorbed, the temperature of the system refrigerant is improved, a large amount of liquid refrigerant is prevented from directly entering the compressor, and then the normal heating mode is switched, so that the refrigerant can be rapidly circulated, the heating efficiency is improved, and the stability of the compressor is improved.
Description
Technical Field
The invention relates to the technical field of units, in particular to a control method and device of a low-temperature heating unit and multi-split equipment.
Background
The multi-split air conditioner is mostly installed in public places such as office buildings, shopping malls and the like, and the multi-split air conditioner is mostly used in the daytime and is turned off at night. In cold winter, the outdoor temperature is lower at night, and the refrigerant in the air conditioning system in a standby state can be transferred to the outdoor heat exchanger. Therefore, a large amount of liquid refrigerant enters the compressor when the air conditioner is started to heat, and the liquid impact of the compressor and the heating effect are poor.
Aiming at the problem of poor heating effect of the air conditioner in the low-temperature environment in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a control method and device of a low-temperature heating unit and multi-split equipment, and aims to solve the problem that the heating effect of an air conditioner is poor in the low-temperature environment in the prior art.
In order to solve the technical problem, the invention provides a control method of a low-temperature heating unit, wherein the method comprises the following steps: when the unit is in a heating standby mode, judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time; if yes, controlling the unit to enter a defrosting mode; and in the process of operating the defrosting mode by the unit, if the unit meets the normal heating starting condition, controlling the unit to enter a normal heating mode.
Further, whether the low-temperature heating starting condition is met or not is judged according to the outdoor environment temperature and the standby time, and the method comprises the following steps: if the outdoor environment temperature is less than or equal to a preset low temperature and the standby time exceeds a first preset time, judging that a low-temperature heating starting condition is met; wherein the standby time period is a maintenance time period in which the outdoor ambient temperature is less than or equal to a preset low temperature.
Further, the unit is controlled to enter a defrosting mode, and the defrosting mode comprises the following steps: switching the four-way valve to ensure that the flow direction of the refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and controlling the compressor to operate at the highest frequency; and controlling the outdoor fan not to be started.
Further, after the control unit enters the defrosting mode, the method further comprises the following steps: acquiring indoor environment temperature, and judging whether the indoor unit has a starting requirement or not according to the indoor environment temperature; if the internal unit has a starting requirement, judging whether the unit meets a normal heating starting condition; and if the internal unit does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio, and if not, judging whether the unit meets the normal heating starting condition.
Further, after the internal unit has a power-on demand, before the determining whether the unit meets a normal heating start condition, the method further includes:
controlling the inner fan to reversely rotate; wherein, the rotating speed Z of the inner fan is Z0+ZRepair the*A；Z0Indicating a rotational speed, Z, at which no cold wind is felt in a predetermined environmentRepair theIndicating no cold air induction correction value, wherein A is a rotation speed coefficient; and the number of the first and second groups,
controlling the opening of an electronic expansion valve of an internal machine; wherein the opening degree P of the electronic expansion valve is P0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value is expressed by the refrigerant-free flowing sound, and B is an opening coefficient.
Further, after the determining that the unit meets the normal heating starting condition, the method further includes: controlling the opening of an electronic expansion valve of an internal machine in a standby state; wherein, the opening degree P of the electronic expansion valve is equal to P0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value is expressed by the refrigerant-free flowing sound, and B is an opening coefficient.
Further, whether the unit accords with the normal heating starting condition is judged, and the method comprises the following steps: determining the superheat degree of an indoor unit and the operation time of a defrosting mode; and if the number of the indoor units with the indoor unit superheat degree smaller than the preset threshold value exceeds half of the total number of the indoor units, or the running time of the defrosting mode exceeds a second preset time, judging that the unit meets the normal heating starting condition.
Further, after judging whether the boot capacity ratio exceeds the preset ratio, the method further includes: and if the current value exceeds the preset threshold value, controlling the electronic expansion valve of the internal machine in the standby state to be closed.
Further, the control unit enters a normal heating mode, and the method comprises the following steps: and controlling the fan of the inner machine to stop, closing the electronic expansion valve, exiting the defrosting mode and entering a normal heating mode.
The invention also provides a control device of the low-temperature heating unit, wherein the control device comprises: the low-temperature judging module is used for judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time when the unit is in the heating standby mode; the defrosting control module is used for controlling the unit to enter a defrosting mode after the unit meets the low-temperature heating starting condition; and the heating control module is used for controlling the unit to enter a normal heating mode if the unit meets the normal heating starting condition in the defrosting mode operation process of the unit.
Further, the defrosting control module is specifically used for switching the four-way valve so that the flow direction of a refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and controlling the compressor to operate at the highest frequency; and controlling the outdoor fan not to be started.
Further, the apparatus further comprises: the heating trigger module is used for acquiring indoor environment temperature and judging whether the indoor unit has a starting requirement or not according to the indoor environment temperature; if the internal unit has a starting requirement, judging whether the unit meets a normal heating starting condition; and if the internal unit does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio, and if not, judging whether the unit meets the normal heating starting condition.
Further, the heating control module is specifically configured to control a fan of the internal unit to stop, close the electronic expansion valve, exit the defrosting mode, and enter a normal heating mode.
The invention also provides multi-split equipment, wherein the multi-split equipment comprises the control device of the low-temperature heating unit.
The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, before the unit which is standby in a low-temperature environment operates in a normal heating mode, the defrosting mode is started, the liquid refrigerant in the outdoor heat exchanger is pushed into the heat exchanger of the indoor unit with higher temperature, the indoor heat is absorbed, the temperature of the system refrigerant is improved, a large amount of liquid refrigerant is prevented from directly entering the compressor, and then the normal heating mode is switched, so that the refrigerant can be rapidly circulated, the heating efficiency is improved, and the stability of the compressor is improved.
Drawings
Fig. 1 is a flowchart of a method for controlling a low-temperature heating unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a low-temperature heating control of an air conditioning system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a configuration of a control apparatus of a low-temperature heating unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The invention provides a control method of a low-temperature heating unit for improving the heating effect and the user comfort, aiming at the problems of poor heating effect of an air conditioning system and poor reliability of a compressor in a low-temperature environment.
Fig. 1 is a flowchart of a method for controlling a low-temperature heating unit according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S101, when the unit is in a heating standby mode, judging whether a low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time;
step S102, if the condition is met, controlling the unit to enter a defrosting mode;
step S103, in the defrosting mode of the unit operation, if the unit meets the normal heating starting condition, the unit is controlled to enter a normal heating mode;
and step S104, if the data is not met, directly entering a normal heating mode.
Through this embodiment, to the unit of standby under the low temperature environment, before its normal mode of heating of operation, through opening the mode of defrosting, push the higher indoor set heat exchanger of temperature to liquid refrigerant among the outdoor heat exchanger in, absorb indoor heat, improve system refrigerant temperature, avoid a large amount of liquid refrigerant directly to get into the compressor in, trun into normal mode of heating, the refrigerant can rapid cycle, improves the efficiency of heating.
In the step S101, as to how to judge whether the low-temperature heating start condition is met according to the outdoor environment temperature and the standby time, the present embodiment provides a preferred embodiment, that is: if the outdoor environment temperature is less than or equal to the preset low temperature and the standby time exceeds the first preset time, judging that the low-temperature heating starting condition is met; the standby time duration is the maintaining time duration when the outdoor environment temperature is less than or equal to the preset low temperature. That is, after the unit is determined to be in the ultra-low temperature environment and to be in standby for a period of time, the defrosting mode is executed before the unit is to operate the normal heating mode, so that the liquid refrigerant in the outdoor heat exchanger is pushed into the indoor heat exchanger with higher temperature, and a large amount of liquid refrigerant is prevented from directly entering the compressor.
The unit enters a defrosting mode, and the following operations are specifically required to be executed: switching the four-way valve to ensure that the flow direction of the refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and controlling the compressor to operate at the highest frequency; and controlling the outdoor fan not to be started.
After the unit operates in the defrosting mode, the time for the unit to operate in the normal heating mode needs to be determined based on some condition judgment. In particular, this can be achieved by the following preferred embodiments:
1) and acquiring the indoor environment temperature, and judging whether the indoor unit has a starting requirement according to the indoor environment temperature. That is, if the indoor environment temperature is lower than the preset comfortable temperature (for example, the comfortable temperature of a human body), it is determined that there is a starting requirement and heating is required to raise the indoor environment problem.
2) And if the internal machine has a starting requirement, controlling the fan of the internal machine to reversely rotate and starting the electronic expansion valve of the internal machine. In the defrosting process, the fan required by the indoor unit is turned over, so that the evaporation and heat absorption of the refrigerant can be accelerated, and meanwhile, the rotating speed of the fan is controlled according to the indoor ambient temperature, so that the evaporation of the refrigerant is accelerated better, and cold air blowing is avoided.
Then judging whether the unit meets the normal heating starting condition or not; wherein, the rotating speed Z of the inner fan is Z0+ZRepair the*A；Z0Indicating a rotational speed, Z, at which no cold wind is felt in a predetermined environmentRepair theIndicating no cold feeling correction value, and a is an opening coefficient (for example, may take a value of 50); opening degree P of electronic expansion valve0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value indicating the refrigerant-free flowing sound, B is an opening coefficient (for example, may be 50).
3) And if the internal machine does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio.
31) If the starting capacity ratio does not exceed the preset ratio, controlling the opening of an electronic expansion valve of the internal unit in the standby state, and then judging whether the unit meets the normal heating starting condition or not; wherein, the opening degree P of the electronic expansion valve is equal to P0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value indicating the refrigerant-free flowing sound, B is an opening coefficient (for example, may be 50).
32) And if the starting capacity ratio exceeds a preset ratio, controlling the electronic expansion valve of the internal machine in the standby state to be closed.
It should be noted that, the determining whether the unit meets the normal heating starting condition includes: determining the superheat degree of an indoor unit and the operation time of a defrosting mode; and if the number of the indoor units with the indoor unit superheat degree smaller than the preset threshold value exceeds half of the total number of the indoor units, and the running time of the defrosting mode exceeds a second preset time, judging that the unit meets the normal heating starting condition.
The multi-split air conditioner system can be matched with a plurality of indoor units, when the low-temperature heating starting is carried out and the number of the started indoor units is small, the circulation of the refrigerant of the system is poor, and the liquid refrigerant can not be evaporated and absorb heat well. According to the embodiment, the standby inner machine electronic expansion valve is added according to the capacity ratio of the starting inner machine, and the opening degree of the electronic expansion valve is controlled according to the indoor environment temperature, so that the liquid refrigerant entering the inner machine is completely evaporated, and the liquid flow noise is avoided.
After the unit is confirmed to be capable of entering the normal heating mode, the fan of the internal unit is controlled to stop, the electronic expansion valve is closed, the defrosting mode exits, and the normal heating mode is entered. And then the unit can normally heat and operate. The refrigerant can circulate fast, raise and heat the efficiency.
It should be noted that the present embodiment can be applied not only to air conditioning equipment, but also to other equipment with heating function.
Example 2
Fig. 2 is a flow chart of the low-temperature heating control of the air conditioning system according to the embodiment of the present invention, as shown in fig. 2, the flow chart includes the following steps:
step 1, recording the outdoor environment temperature and the standby time of an air conditioning unit when the air conditioning system is in a heating standby mode;
step 2, when the average temperature of the outdoor environment is judged to be less than or equal to the preset low temperature (for example-20 ℃), and the time length of the average temperature being less than or equal to-20 ℃ is longer than the first preset time length (3 h); if yes, executing step 3, if no, executing step 12;
step 3, when the air conditioning system is started, the ultra-low temperature heating starting control is carried out, then the unit enters a defrosting mode, the four-way valve is controlled to switch, the flow direction of refrigerant in the unit is the same as that in the refrigerating mode, the compressor runs at the highest frequency, and the outdoor fan is not started;
step 4, detecting the ambient temperature T1 of the internal machine;
step 5, judging whether the indoor unit has a heating starting requirement or not; if yes, executing step 6, and if not, executing step 9;
and 6, when the internal machine has a starting requirement, reversely rotating the fan of the internal machine, controlling the rotating speed to be Z, opening the electronic expansion valve of the internal machine, and keeping the opening degree to be P, wherein the heat exchanger of the internal machine can meet the heat absorption requirement of a system refrigerant, and the electronic expansion valve of the standby internal machine is closed.
How to determine the rotating speed and how to determine the opening of the electronic expansion valve of the inner machine when the inner machine fan reversely rotates are respectively described below.
The inner fan is reversely rotated and controlled, and the rotating speed Z is equal to Z0+ZRepair the50 (units r/min); wherein Z is0Is defined as the rotating speed of the user sensing no cold wind under a preset environment (such as the environment with the temperature T0), and determines the corresponding correction value Z without cold wind sense through experimental data according to different indoor environment temperatures TRepair the. Table 1 shows the preset correspondence between the indoor ambient temperature and the cold-feel-free correction value.
TABLE 1
| Temperature T DEG C | 25℃ | 27℃ | 29℃ | 31℃ | 33℃ |
| Correction value ZRepair the | 0 | 1.5 | 2.5 | 4 | 6 |
Controlling the electronic expansion valve of the internal machine, wherein the opening degree P is equal to P0+PRepair the50 (units Pls); wherein, P0The method includes the steps that when the temperature is defined as a preset environment (such as a temperature T0 environment) and an indoor unit fan is turned off, a user feels the opening value of the indoor unit without refrigerant flowing sound; when the fan is turned off, according to different indoor environment temperatures T, determining the corresponding opening correction value P of the refrigerant-free flowing sound through experimental dataRepair the. Table 2 shows the preset correspondence relationship between the indoor ambient temperature and the corrected value of the opening degree of the refrigerant-free flowing sound. When the fan is turned on, PRepair theDefaults to a maximum value.
TABLE 2
| Temperature T DEG C | 25℃ | 27℃ | 29℃ | 31℃ | 33℃ |
| Correction value PRepair the | 0 | 2 | 3 | 4 | 6 |
Step 7, judging whether the number of the indoor units with the indoor unit superheat degree (the indoor unit superheat degree is the indoor unit outlet pipe temperature-the indoor unit inlet pipe temperature) less than a preset threshold value (10 ℃) exceeds half of the total number of the indoor units; or whether the running time of the defrosting mode is greater than a second preset time (10 min); if yes, executing step 8, if no, executing step 5;
step 8, stopping the inner fan, closing the electronic expansion valve and exiting the defrosting mode; then executing the step;
step 9, judging whether the starting capacity ratio is larger than a preset ratio (for example, 60%); if yes, executing step 10, if no, executing step 11;
step 10, waiting for the electronic expansion valve of the internal machine to be closed;
step 11, in order to meet the requirement of rapid circulation and heat absorption of a system refrigerant, the standby internal unit controls the electronic expansion valve to open, and the opening degree of the internal unit is controlled according to the control P ═ P of the internal unit electronic expansion valve0+PRepair the*50；
And step 12, controlling normal heating starting of the air conditioning system.
The ambient temperature and the time that this embodiment is located through the air conditioning system off-premises station that detects standby state, and then whether accurate judgement refrigerant migrates to outdoor heat exchanger, before normal mode operation that heats, through opening the mode of defrosting, push the indoor set heat exchanger that the temperature is higher to liquid refrigerant among the outdoor heat exchanger, absorb indoor heat, improve system refrigerant temperature, avoid a large amount of liquid refrigerant directly to get into in the compressor. And then the normal heating mode is switched, so that the refrigerant can be rapidly circulated, and the heating efficiency is improved.
Example 3
Corresponding to the method for controlling a low-temperature heating unit introduced in fig. 1, the present embodiment provides a control device for a low-temperature heating unit, such as a block diagram of a control device for a low-temperature heating unit shown in fig. 3, where the control device includes:
the low-temperature judging module 10 is used for judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time when the unit is in the heating standby mode;
the defrosting control module 20 is used for controlling the unit to enter a defrosting mode after the unit meets the low-temperature heating starting condition;
and the heating control module 30 is configured to, in the defrosting mode of the unit operation, control the unit to enter a normal heating mode if the unit meets a normal heating start condition.
Through this embodiment, to the unit of standby under the low temperature environment, before its normal mode of heating of operation, through opening the mode of defrosting, push the higher indoor set heat exchanger of temperature to liquid refrigerant among the outdoor heat exchanger in, absorb indoor heat, improve system refrigerant temperature, avoid a large amount of liquid refrigerant directly to get into the compressor in, trun into normal mode of heating, the refrigerant can rapid cycle, improves the efficiency of heating.
The defrosting control module is specifically used for switching the four-way valve so that the flow direction of a refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and controlling the compressor to operate at the highest frequency; and controlling the outdoor fan not to be started.
The above-mentioned device still includes: the heating trigger module is used for acquiring indoor environment temperature and judging whether the indoor unit has a starting requirement or not according to the indoor environment temperature; if the internal unit has a starting requirement, judging whether the unit meets a normal heating starting condition; and if the internal unit does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio, and if not, judging whether the unit meets the normal heating starting condition.
It should be noted that, the determining whether the unit meets the normal heating starting condition includes: determining the superheat degree of an indoor unit and the operation time of a defrosting mode; and if the number of the indoor units with the indoor unit superheat degree smaller than the preset threshold value exceeds half of the total number of the indoor units, and the running time of the defrosting mode exceeds a second preset time, judging that the unit meets the normal heating starting condition.
The heating control module is specifically used for controlling the fan of the internal machine to stop, closing the electronic expansion valve, exiting the defrosting mode and entering the normal heating mode. And then the unit can normally heat and operate. The refrigerant can circulate fast, raise and heat the efficiency.
The embodiment also provides multi-split equipment, wherein the multi-split equipment comprises the control device of the low-temperature heating unit.
Example 4
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
The embodiment of the invention provides a nonvolatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the control method of the low-temperature heating unit in any method embodiment.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. A control method for a low-temperature heating unit is characterized by comprising the following steps:
when the unit is in a heating standby mode, judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time;
if yes, controlling the unit to enter a defrosting mode;
and in the process of operating the defrosting mode by the unit, if the unit meets the normal heating starting condition, controlling the unit to enter a normal heating mode.
2. The method of claim 1, wherein determining whether the low temperature heating start condition is met according to the outdoor environment temperature and the standby time period comprises:
if the outdoor environment temperature is less than or equal to a preset low temperature and the standby time exceeds a first preset time, judging that a low-temperature heating starting condition is met; wherein the standby time period is a maintenance time period in which the outdoor ambient temperature is less than or equal to a preset low temperature.
3. The method of claim 1, wherein controlling the unit to enter a defrost mode comprises:
switching the four-way valve to ensure that the flow direction of the refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and the number of the first and second groups,
controlling the compressor to operate at the highest frequency; and the number of the first and second groups,
and controlling the outdoor fan not to be started.
4. The method of claim 1, wherein after the controlling the assembly to enter the defrosting mode, further comprising:
acquiring indoor environment temperature, and judging whether the indoor unit has a starting requirement or not according to the indoor environment temperature;
if the internal unit has a starting requirement, judging whether the unit meets a normal heating starting condition;
and if the internal unit does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio, and if not, judging whether the unit meets the normal heating starting condition.
5. The method according to claim 4, wherein after the if-internal unit has a starting requirement, before the determining whether the unit meets a normal heating starting condition, the method further comprises:
controlling the inner fan to reversely rotate; wherein, the rotating speed Z of the inner fan is Z0+ZRepair the*A；Z0Indicating a rotational speed, Z, at which no cold wind is felt in a predetermined environmentRepair theIndicating no cold air induction correction value, wherein A is a rotation speed coefficient;
and the number of the first and second groups,
controlling the opening of an electronic expansion valve of an internal machine; wherein the opening degree P of the electronic expansion valve is P0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value is expressed by the refrigerant-free flowing sound, and B is an opening coefficient.
6. The method of claim 4, wherein after said if not exceeding, before said determining whether the unit meets normal heating start conditions, further comprising:
controlling the opening of an electronic expansion valve of an internal machine in a standby state; it is composed ofIn the above description, the opening degree P of the electronic expansion valve is P0+PRepair the*B；P0An opening value P representing no refrigerant flowing sound under the condition that the internal fan is closed in a preset environmentRepair theThe opening correction value is expressed by the refrigerant-free flowing sound, and B is an opening coefficient.
7. The method of claim 4, wherein determining whether the unit meets normal heating start conditions comprises:
determining the superheat degree of an indoor unit and the operation time of a defrosting mode;
and if the number of the indoor units with the indoor unit superheat degree smaller than the preset threshold value exceeds half of the total number of the indoor units, or the running time of the defrosting mode exceeds a second preset time, judging that the unit meets the normal heating starting condition.
8. The method of claim 4, wherein after determining whether the boot capacity ratio exceeds the predetermined ratio, further comprising:
and if the current value exceeds the preset threshold value, controlling the electronic expansion valve of the internal machine in the standby state to be closed.
9. The method of claim 1, wherein controlling the unit to enter a normal heating mode comprises:
and controlling the fan of the inner machine to stop, closing the electronic expansion valve, exiting the defrosting mode and entering a normal heating mode.
10. A control device for a low-temperature heating unit is characterized by comprising:
the low-temperature judging module is used for judging whether the low-temperature heating starting condition is met or not according to the outdoor environment temperature and the standby time when the unit is in the heating standby mode;
the defrosting control module is used for controlling the unit to enter a defrosting mode after the unit meets the low-temperature heating starting condition;
and the heating control module is used for controlling the unit to enter a normal heating mode if the unit meets the normal heating starting condition in the defrosting mode operation process of the unit.
11. The apparatus of claim 10,
the defrosting control module is specifically used for switching the four-way valve so that the flow direction of a refrigerant in the unit is the same as that of the refrigerant in the refrigeration mode; and controlling the compressor to operate at the highest frequency; and controlling the outdoor fan not to be started.
12. The apparatus of claim 10, further comprising:
the heating trigger module is used for acquiring indoor environment temperature and judging whether the indoor unit has a starting requirement or not according to the indoor environment temperature; if the internal unit has a starting requirement, judging whether the unit meets a normal heating starting condition; and if the internal unit does not have the starting requirement, judging whether the starting capacity ratio exceeds a preset ratio, and if not, judging whether the unit meets the normal heating starting condition.
13. The apparatus of claim 10,
the heating control module is specifically used for controlling the fan of the internal machine to stop, the electronic expansion valve to be closed, the defrosting mode to exit and the normal heating mode to enter.
14. A multi-split air-conditioning system, characterized in that the multi-split air-conditioning system comprises the control device of the low-temperature heating unit as claimed in any one of claims 10 to 13.
15. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 9.
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