CN115727479B - Defrosting judging method based on Internet of things and air conditioning unit - Google Patents
Defrosting judging method based on Internet of things and air conditioning unit Download PDFInfo
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- CN115727479B CN115727479B CN202211485947.7A CN202211485947A CN115727479B CN 115727479 B CN115727479 B CN 115727479B CN 202211485947 A CN202211485947 A CN 202211485947A CN 115727479 B CN115727479 B CN 115727479B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 68
- 238000010257 thawing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000006855 networking Effects 0.000 claims 1
- 238000004458 analytical method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a defrosting judging method based on the Internet of things and an air conditioner unit, wherein the defrosting judging method comprises the following steps: detecting working parameters of the outdoor heat exchanger when the air conditioning unit is in a heating mode; judging whether the outdoor heat exchanger meets frosting conditions according to the working parameters; if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts. Compared with the prior art, the invention combines the internet of things to judge whether the outdoor heat exchanger frosts or not, and executes the defrosting program, thereby improving the accuracy of the system in judging defrosting, realizing frosting and frostless defrosting, and reducing the influence on the indoor air temperature when the air conditioning unit frosts.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a defrosting judging method based on the Internet of things and an air conditioner unit.
Background
At present, most manufacturers judge whether frosting occurs according to the tube temperature of the outdoor heat exchanger in the case of low ambient temperature in the immobilized frost period, but the outdoor heat exchanger does not necessarily cause frosting in the case of low air humidity in the actual low temperature working condition, and misjudgment is caused if the frosting occurs only according to the tube temperature, so that the defrosting times are increased. In defrosting, it is generally necessary to switch the heating cycle to the refrigeration cycle, and the compressor is used as a heat source to cause the high-temperature gas refrigerant from the compressor to flow into the outdoor heat exchanger for defrosting, so that the indoor temperature is greatly reduced, the time required for the room temperature to reach the set temperature is prolonged, and the comfort of use by users is greatly impaired.
Therefore, how to design a defrosting judgment method based on the internet of things and an air conditioner unit, so that the accuracy of system judgment on frosting can be improved, and the technical problem to be solved in the industry is urgent.
Disclosure of Invention
Aiming at the problem that in the prior art, the accuracy of system judgment of frosting of an outdoor heat exchanger is poor, the invention provides a defrosting judgment method based on the Internet of things and an air conditioning unit.
The technical scheme of the invention is that a defrosting judging method based on the Internet of things is provided, which comprises the following steps:
Detecting working parameters of the outdoor heat exchanger when the air conditioning unit is in a heating mode;
Judging whether the outdoor heat exchanger meets frosting conditions according to the working parameters;
if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts.
Further, judging whether the outdoor heat exchanger frosts according to the internet of things, comprising:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
Recording air conditioning units with defrosting time longer than a first preset time length, and judging whether the number of the air conditioning units with defrosting time longer than the first preset time length reaches half of that of all the air conditioning units;
If yes, the outdoor heat exchanger is judged to be frosted, otherwise, the outdoor heat exchanger is judged to be not frosted.
Further, the operating parameters include the tube temperature of the outdoor heat exchanger and the economizer pressure.
Further, judging whether the outdoor heat exchanger meets frosting conditions according to the working parameters includes:
Judging whether the pipe temperature of the outdoor heat exchanger is lower than a preset temperature;
If yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than the second preset duration.
Further, before determining that the outdoor heat exchanger satisfies the frosting condition, it further includes:
judging whether the pressure of the economizer is in a preset pressure range, if so, judging that the outdoor heat exchanger meets frosting conditions;
if not, re-judging whether the pipe temperature of the outdoor heat exchanger is lower than the preset temperature.
Further, before detecting the operation parameter of the outdoor heat exchanger, it further includes: and presetting the preset temperature, the preset pressure range and a second preset duration according to frosting conditions of the outdoor heat exchanger.
Further, after the defrosting program is started, the method further comprises the steps of detecting whether the air conditioning unit meets the defrosting stopping condition or not, stopping defrosting if yes, and returning to judgment of the defrosting condition.
Further, the preset temperature is-4 ℃, the preset pressure range is 250 kpa-400 kpa, and the second preset time period is 5min.
Further, the first preset time period is 1.5min.
The invention also provides an air conditioning unit, which is provided with the defrosting judgment method.
Compared with the prior art, the invention has at least the following beneficial effects:
According to the invention, on the traditional frosting judgment logic, the analysis and judgment process of the Internet of things is additionally added, the accuracy of frosting judgment of the system is improved, frosting is realized, no frosting is realized, the influence on indoor air temperature when an air conditioner unit frosts is reduced, and the comfort level of use of a user and the heating effect of an air conditioner are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a defrosting determination method of the present invention;
fig. 2 is a control flow chart of the whole present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
At present, the judging method of whether the outdoor heat exchanger is frosted by the air conditioning unit is to judge by means of the pipe temperature of the outdoor heat exchanger, but the outdoor heat exchanger is not necessarily frosted when the pipe temperature of the outdoor heat exchanger is lower than the preset temperature under the condition of lower air humidity. Therefore, with the current frosting judgment mode, misjudgment is easy to occur, so that the frosting times of the air conditioning unit are increased, and when the frosting is performed, the heating cycle of the air conditioning unit is usually required to be switched into the refrigerating cycle, and the compressor is used as a heat source. Aiming at the problems, the invention has the advantages that the analysis and judgment of the Internet of things are additionally added on the traditional frosting judgment logic, the accuracy of frosting judgment is improved, the frosting effect and the frosting-free effect are achieved, and the using comfort of users is improved.
Referring to fig. 2, the defrosting determination method provided by the present invention includes:
Detecting working parameters of the outdoor heat exchanger when the air conditioning unit is in a heating mode;
judging whether the outdoor heat exchanger meets frosting conditions according to the working parameters;
If yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts.
According to the defrosting judging method, the outdoor heat exchanger is only used for judging whether the outdoor heat exchanger meets the frosting condition or not based on the working parameters of the outdoor heat exchanger, and whether the outdoor heat exchanger frosts or not specifically, further judgment is needed according to the Internet of things, so that the accuracy of frosting judgment is improved.
Here, the judgment logic of the internet of things is only executed under the condition that the outdoor heat exchanger meets frosting, so that the calculation time of the system can be saved, if the frosting judgment of the outdoor heat exchanger is based on the judgment of the internet of things, the real-time operation of the internet of things needs to be ensured, the frosting judgment is performed, and the calculation pressure of the internet of things is greatly increased. In addition, the defrosting judging method is only carried out when the air conditioning unit is in the heating mode, and the external environment temperature is generally higher when the air conditioning unit is in the cooling mode, and the frosting phenomenon cannot occur, so that the whole judging logic can be set in the heating mode of the air conditioning unit, the detection time of the air conditioning unit can be reduced, and unnecessary operation logic is saved.
Further, the action of judging whether the outdoor heat exchanger frosts according to the internet of things, which is pointed out in the invention, comprises the following steps:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
Recording air conditioning units with defrosting time longer than a first preset time length, and judging whether the number of the air conditioning units with defrosting time longer than the first preset time length reaches half of that of all the air conditioning units;
If yes, the outdoor heat exchanger is judged to be frosted, otherwise, the outdoor heat exchanger is judged to be not frosted.
It can be seen that in the judgment logic of the Internet of things, the defrosting conditions of a plurality of air conditioning units are combined for analysis, so that the accuracy of judging the frosting of the outdoor heat exchanger is greatly improved. In the present invention, the condition for judging whether or not the outdoor heat exchanger is frosted is not: and whether the number of the air conditioning units with the defrosting time longer than the first preset time is half of that of all the air conditioning units. Here, the first preset duration is used for judging whether other air conditioning units enter a defrosting mode, if more than half of other surrounding air conditioning units enter the defrosting mode, the outdoor heat exchanger can be judged to have larger accuracy, and a defrosting program can be performed.
In the invention, in order to improve the judgment precision of the Internet of things, only a plurality of air conditioning units near the current air conditioning unit are selected, and if the air conditioning unit with a longer distance is selected, the current air conditioning unit and other air conditioning units can be different in environments due to the fact that the distance is too far, so that the judgment precision of the Internet of things is affected. The invention is preferably an air conditioning unit within 1.5 km from the current air conditioning unit, and whether the outdoor heat exchanger frosts or not is further judged by comprehensively planning the defrosting conditions of a plurality of air conditioning units, so that the accuracy of frosting judgment is greatly improved.
Specifically, the first preset time set in the method is 1.5min, and the judgment action based on the Internet of things is as follows: when the outdoor heat exchanger meets the frosting condition, the internet of things adopts a data analysis algorithm to analyze the frosting duration of the air conditioning unit within 1.5 km from the current air conditioning unit within one hour, and if more than half of the frosting duration of the air conditioning unit reaches the first preset time, the outdoor heat exchanger is judged to be frosted. In order to improve the accuracy of the analysis of the Internet of things, a plurality of air conditioning units can be selected for analysis, and ten air conditioning units closest to the current air conditioning unit are adopted for analysis.
In addition, in the action based on the analysis of the Internet of things, the traditional defrosting judging method is optimized, in the traditional defrosting judging method, the judgment is only based on the pipe temperature of the outdoor heat exchanger, and a large error exists.
Specifically, the working parameters collected in the invention include the tube temperature of the outdoor heat exchanger and the pressure of the economizer, and the method for judging whether the outdoor heat exchanger meets the frosting condition according to the working parameters comprises the following steps:
judging whether the pipe temperature of the outdoor heat exchanger is lower than a preset temperature;
if yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than the second preset duration.
The above steps are the judging logic based on the tube temperature of the outdoor heat exchanger in the invention, in order to avoid the situation that the ambient temperature fluctuation is misjudged, the invention further detects the duration time lower than the preset temperature when the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and only when the duration time reaches the second preset duration time, the outdoor heat exchanger is judged to meet the frosting condition, thereby avoiding misjudgment caused by the ambient temperature fluctuation.
It should be noted that, the duration here does not refer to the total duration of the outdoor heat exchanger below the preset temperature in the whole detection process, but the duration of the outdoor heat exchanger below the preset temperature at a single time. Through the design mode, misjudgment caused by environmental temperature coupling is avoided to a great extent.
Specifically, in the invention, the preset temperature is set to be-4 ℃, the second preset time length is set to be 5min, and the specific detection logic is as follows: when the temperature of the outdoor heat exchanger is detected to be lower than-4 ℃, detecting the time length of being lower than-4 ℃ again, and only when the time length reaches 5min, determining that the outdoor heat exchanger frosts, otherwise, clearing the recorded time length and restarting the detection.
Further, the logic for determining whether the outdoor heat exchanger is frosted based on the pressure of the economizer according to the present invention comprises:
judging whether the pressure of the economizer is in a preset pressure range, if so, judging that the outdoor heat exchanger meets frosting conditions;
If not, re-judging whether the pipe temperature of the outdoor heat exchanger is lower than the preset temperature.
The pressure judging logic is arranged before the pipe temperature judging logic of the outdoor heat exchanger judges that the frosting condition is met, namely, the pressure judging logic is only executed when the pipe temperature of the outdoor heat exchanger meets the frosting condition and is used for further judging whether the outdoor heat exchanger meets the frosting condition or not, so that the misjudgment problem caused by judging by only depending on the pipe temperature is avoided.
In the invention, the preset pressure range is set to be 250 kpa-400 kpa, when the judgment logic of the pressure of the economizer is carried out, the frosting condition of the outdoor heat exchanger can be considered only when the pressure of the economizer is within the preset pressure range, otherwise, the judgment logic of the pipe temperature of the outdoor heat exchanger can be returned again, and the judgment action of the pipe temperature of the outdoor heat exchanger can be restarted.
The preset temperature, the preset pressure range and the second preset time length pointed out by the defrosting judging method are all calculated according to the frosting condition of the outdoor heat exchanger. Specifically, the calculation of the parameters can be obtained through the Internet of things, the environmental parameters of the outdoor heat exchanger of the current air conditioning unit under the frosting condition are recorded for many times, and the average value of the environmental parameters is obtained for determining, so that the accuracy of frosting judgment by adopting the parameters is higher.
Specifically, the preset temperature is-4 ℃, the preset pressure range is 250 kpa-400 kpa, and the second preset time period is 5min. The setting of each parameter is arranged before the working parameter of the outdoor heat exchanger is detected, so that the subsequent frosting judgment can be facilitated.
Further, after the defrosting process is started, in order to avoid the air conditioning unit being in the defrosting process for a long time, whether the outdoor heat exchanger is defrosted is detected, so that the invention further comprises the following steps after the defrosting process is started:
and detecting whether the air conditioning unit meets the defrosting stopping condition, if so, stopping defrosting, and returning to the judgment of the defrosting condition.
The above-mentioned defrosting stop condition may be set according to the above-mentioned defrosting condition, specifically, the defrosting condition is that the pipe temperature of the outdoor heat exchanger is lower than-4 ℃ and the pressure of the economizer is between 250kpa and 400kpa, and in this regard, the defrosting stop condition set in the present invention may be determined by judging that the outdoor heat exchanger is not in the above-mentioned defrosting condition. By setting the frosting stopping condition, the electric energy waste caused by the long-time defrosting mode of the air conditioning unit can be avoided.
Please refer to fig. 1, which is an overall flowchart of the defrosting determination method based on the internet of things of the present invention;
the method comprises the steps of firstly judging according to the tube temperature T of the outdoor heat exchanger, if the tube temperature T of the outdoor heat exchanger is larger than the preset temperature Ts, directly identifying that the outdoor heat exchanger is not frosted, and judging that the current air conditioning unit normally operates, otherwise, if the tube temperature T of the outdoor heat exchanger is smaller than the preset temperature Ts, further judging that the tube temperature T of the outdoor heat exchanger is smaller than the duration of the preset temperature Ts, namely judging whether the tube temperature T is continuous or not in the figure 1, and entering the judgment logic of the pressure of the economizer when the duration reaches the second preset time, otherwise, restarting timing.
The logic for determining the economizer pressure is "determining whether the economizer pressure belongs to the set range" in fig. 1, where the set range is the preset pressure range indicated above, and it is only determined that the outdoor heat exchanger has frosting phenomenon when the economizer pressure is within the preset pressure range, otherwise, it is determined that the pipe temperature T of the outdoor heat exchanger has erroneous determination, and the air conditioning unit is normally operated.
When the pressure of the economizer is judged and the outdoor heat exchanger is determined to meet the frosting condition, the judgment logic of the Internet of things is entered, a plurality of air conditioning units near the current air conditioning unit are collected through the Internet of things to determine, and the accuracy of the current judgment is improved. The number of the air conditioning units collected in the invention is 10, the first preset time is set to be 1.5min, the pointed judgment logic based on the Internet of things is that in figure 1, whether the ratio of the time length of defrosting of 10 units closest to the unit in the last hour is greater than 1.5min is greater than 50% is analyzed, and only when the judgment logic judges that the defrosting is yes, the outdoor heat exchanger of the current air conditioning unit is judged to be frosted, and a defrosting program is started.
After the defrosting program is started, whether the air conditioning unit meets the defrosting stopping condition or not needs to be judged, and when the air conditioning unit meets the defrosting stopping condition, the air conditioning unit is restored to a heating mode again, and the judging logic of frosting of the outdoor heat exchanger is started.
The invention also provides an air conditioning unit which adopts the defrosting judgment method based on the Internet of things.
In summary, compared with the prior art, the invention additionally increases the process of analyzing and judging the Internet of things on the traditional frosting judgment logic, improves the accuracy of judging frosting of the system, achieves frosting and frosting-free effects, reduces the influence on indoor air temperature when an air conditioner unit frosts, and improves the comfort level of use of users and the heating effect of the air conditioner.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The defrosting judging method based on the Internet of things is characterized by comprising the following steps of:
Detecting working parameters of the outdoor heat exchanger when the air conditioning unit is in a heating mode;
Judging whether the outdoor heat exchanger meets frosting conditions according to the working parameters;
if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts;
wherein, judge according to the thing networking whether frosting is formed to outdoor heat exchanger includes:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
Recording air conditioning units with defrosting time longer than a first preset time length, and judging whether the number of the air conditioning units with defrosting time longer than the first preset time length reaches half of that of all the air conditioning units;
If yes, the outdoor heat exchanger is judged to be frosted, otherwise, the outdoor heat exchanger is judged to be not frosted.
2. The defrosting determination method of claim 1, wherein the operation parameters include a tube temperature of the outdoor heat exchanger and a pressure of the economizer.
3. The defrosting determination method according to claim 1, wherein determining whether the outdoor heat exchanger satisfies a frosting condition according to the operation parameters comprises:
Judging whether the pipe temperature of the outdoor heat exchanger is lower than a preset temperature;
If yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than the second preset duration.
4. The defrosting determination method according to claim 3, characterized by further comprising, before determining that the outdoor heat exchanger satisfies the frosting condition:
Judging whether the pressure of the economizer is in a preset pressure range, if so, judging that the outdoor heat exchanger meets the junction
A frosting condition;
if not, re-judging whether the pipe temperature of the outdoor heat exchanger is lower than the preset temperature.
5. A defrosting judgment method according to claim 3, characterized by further comprising, before detecting the operation parameters of the outdoor heat exchanger: and presetting the preset temperature, the preset pressure range and the second preset time length according to the frosting condition of the outdoor heat exchanger.
6. The defrosting judgment method according to claim 1, further comprising detecting whether the air conditioning unit satisfies a defrosting stop condition after starting the defrosting program, and if so, stopping defrosting and returning to the judgment of the defrosting condition.
7. The defrosting judgment method according to claim 5, wherein the preset temperature is-4 ℃, the preset pressure range is 250kpa to 400kpa, and the second preset time period is 5min.
8. The defrosting judgment method according to claim 1, wherein the first preset time period is 1.5min.
9. An air conditioning unit, wherein the air conditioning unit employs the defrosting determination method according to any one of claims 1 to 8.
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