CN112665119B - Defrosting control method for direct expansion type air conditioner - Google Patents
Defrosting control method for direct expansion type air conditioner Download PDFInfo
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- CN112665119B CN112665119B CN202110140373.9A CN202110140373A CN112665119B CN 112665119 B CN112665119 B CN 112665119B CN 202110140373 A CN202110140373 A CN 202110140373A CN 112665119 B CN112665119 B CN 112665119B
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Abstract
The invention discloses a defrosting control method for a direct expansion type air conditioner, which comprises the following steps: s1, the air conditioner judges whether the air conditioner enters a defrosting mode according to the outdoor environment temperature and the low pressure value of the refrigerant circulating system; s2, after the air conditioner enters a defrosting mode, the electronic throttling element starts to operate in an initial opening defrosting mode; s3, monitoring the variation trend of the low pressure value of the refrigerant circulation system and the high pressure value of the refrigerant circulation system in real time in the defrosting operation process, and adjusting the opening of the electronic throttling element in real time according to the variation trend; and S4, when the condition of defrosting exiting is met, exiting the defrosting mode. According to the air conditioner defrosting control method, the defrosting logic aims to abandon the traditional defrosting method, change a brand-new logic algorithm into the traditional defrosting method, and achieve the optimal defrosting effect by combining the microcosmic logic and the macroscopic logic, so that good heating performance is ensured, the service life of an air conditioning unit is prolonged, and the core competitiveness of a product is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioner control, and particularly relates to a defrosting control method for a direct expansion type air conditioner.
Background
The direct expansion type air conditioning unit is often controlled in a defrosting link in low-temperature heating, so that the heating quantity is reduced in a heating link after defrosting, user experience is poor, adverse reaction can be generated on the unit due to poor defrosting, heating is long and long when defrosting is carried out, oil return of a press is poor, and the press is easy to strike by liquid.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the defects in the prior art, and provides a defrosting control method for a direct expansion type air conditioner.
The technical scheme is as follows: the invention relates to a defrosting control method of a direct expansion type air conditioner, which comprises the following steps:
s1, the air conditioner judges whether the air conditioner enters a defrosting mode according to the outdoor environment temperature and the low pressure value of the refrigerant circulating system;
s2, after the air conditioner enters a defrosting mode, the electronic throttling element starts to operate in an initial opening defrosting mode;
s3, monitoring the variation trend of the low pressure value of the refrigerant circulation system and the high pressure value of the refrigerant circulation system in real time in the defrosting operation process, and adjusting the opening of the electronic throttling element in real time according to the variation trend;
and S4, when the condition of defrosting exiting is met, exiting the defrosting mode.
Further, the step S1 entering the defrosting mode means that the outdoor ambient temperature and the low pressure value of the refrigerant cycle system reach the preset threshold values.
Further, step S2 is to start the electronic throttle element operating at the maximum opening degree for defrosting.
Further, step S3 includes:
monitoring whether the refrigerant circulating system has a rising trend after a low-pressure descending state in real time in the defrosting operation process, and gradually reducing the opening of the electronic throttling element if the refrigerant circulating system has the rising trend;
and if the low-pressure descending state of the refrigerant circulating system is monitored in real time in the defrosting operation process and then the low-pressure descending state does not have the rising trend, the monitoring is continued.
Furthermore, whether the refrigerant circulating system has a rising trend after a low-pressure descending state is monitored in real time in the defrosting operation process, if so, whether the condition of quitting defrosting is met is judged, and if the condition of quitting defrosting is met, the defrosting program is directly quitted; and if the condition of exiting defrosting is not met, gradually reducing the opening of the electronic throttling element.
Further, step S3 includes:
monitoring whether the refrigerant circulating system has a descending trend after the low-pressure ascending state in real time in the defrosting operation process, and gradually increasing the opening of the electronic throttling element if the refrigerant circulating system has the descending trend;
and if the low-pressure rising state of the refrigerant circulating system is monitored in real time in the defrosting operation process and then the low-pressure rising state does not have the descending trend, the monitoring is continued.
Further, whether the refrigerant circulating system has a descending trend after the low-pressure ascending state is monitored in real time in the defrosting operation process, if so, whether the condition of quitting defrosting is met is judged, and if the condition of quitting defrosting is met, the defrosting program is directly quitted; and if the condition of exiting defrosting is not met, gradually increasing the opening of the electronic throttling element.
Further, step S3 includes:
monitoring whether a high-pressure rising process of a refrigerant circulating system has a steep rising trend in real time in a defrosting operation process, and gradually reducing the opening of the electronic throttling element if the high-pressure rising process of the refrigerant circulating system has the steep rising trend;
and if the high pressure of the refrigerant circulating system does not have a steep rising trend in the process of monitoring the rising of the high pressure in real time in the defrosting operation process, continuing monitoring.
Further, whether a steep rising trend exists in the high-pressure rising process of the refrigerant circulating system is monitored in real time in the defrosting operation process, whether the defrosting condition quits is judged if the steep rising trend exists, and the defrosting program is directly quitted if the defrosting condition quits is met; and if the condition of exiting defrosting is not met, gradually reducing the opening of the electronic throttling element.
Further, the step S4 of exiting the defrosting condition means that the temperature of the outer tray reaches a preset threshold.
Has the advantages that: according to the air conditioner defrosting control method, the defrosting logic aims to abandon the traditional defrosting method, change a brand-new logic algorithm into the traditional defrosting method, and achieve the optimal defrosting effect by combining the microcosmic logic and the macroscopic logic, so that good heating performance is ensured, the service life of an air conditioning unit is prolonged, and the core competitiveness of a product is improved.
Drawings
FIG. 1 is a flow chart of defrosting control according to an embodiment of the present invention;
FIG. 2 is a pressure value trend chart of the defrosting control process according to one embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
As shown in fig. 1, a defrosting control method for a direct expansion type air conditioner includes the following steps:
s1, the air conditioner judges whether the air conditioner enters a defrosting mode according to the outdoor environment temperature and the low pressure value of the refrigerant circulating system, specifically, whether the air conditioner enters the defrosting mode is judged according to the outdoor environment temperature and the low pressure value, and if the outdoor environment temperature and the low pressure value of the refrigerant circulating system reach preset threshold values, the air conditioner enters the defrosting mode; if the judgment condition of the defrosting mode is not met, the outdoor environment temperature and the low pressure value of the refrigerant circulating system are not monitored continuously in the defrosting mode until the defrosting mode is reached;
and S2, after the air conditioner enters the defrosting mode, the electronic throttling element starts to operate at the initial opening degree for defrosting, and at the moment, the electronic throttling element starts to operate at the maximum opening degree for defrosting, which is shown in the attached figure 2. Fig. 2 shows the curve relationship between the respective time node t and the outer disc temperature, the Low Pressure (LP) value, the High Pressure (HP) value, the electronic throttle Element (EXV) opening. Wherein Pmax: EXV maximum, pset: EXV set point, T set: the temperature of the outer plate exits from a defrosting value, the highest value of Pa max low pressure, the lowest value of Pa 1 starting initial stage, Pa ep equilibrium pressure value and the zero value of the temperature of the outer plate at T0 ℃.
When the air conditioner enters the defrosting mode, namely at the time t1, the electronic throttling element starts defrosting operation at the maximum opening Pmax (full open). During the time interval t1-t2, the overall pressure is balanced, and in order to allow the standing refrigerant to flow faster to the high pressure side, EXV is at full capacity (pmax), and the outer disk temperature is gradually increased, and the high pressure is increased.
And S3, monitoring the variation trend of the low pressure value of the refrigerant circulation system and the high pressure value of the refrigerant circulation system in real time in the defrosting operation process, and adjusting the opening of the electronic throttling element in real time according to the variation trend.
Specifically, as shown in fig. 1, during the defrosting operation, whether the refrigerant cycle system has a rising trend after a low-pressure drop state is monitored in real time, and if the refrigerant cycle system has the rising trend, the opening degree of the electronic throttling element is gradually reduced.
In conjunction with the interval T2-T3 of fig. 2, in which the low pressure of the refrigerant cycle system is lowered to the lowest point, the EXV is gradually decreased to the defrosting set point (pset), so that the low pressure of the refrigerant cycle system is not continuously increased, the press is protected from liquid impact, and a state of relatively high pressure is ensured for defrosting, and the temperature of the outer plate is also slowly increased, but is maintained for a while at 0 ℃ (latent heat is required when the liquid 0 ℃ water is evaporated to 0 ℃ water vapor).
Meanwhile, if the low-pressure descending state of the refrigerant circulating system is monitored in real time in the defrosting operation process and then the low-pressure descending state does not have the rising trend, the monitoring is continued.
In the embodiment, preferably, in the defrosting operation process, whether the refrigerant cycle system has a rising trend after a low-pressure falling state is monitored in real time, if so, whether a defrosting exiting condition is met is judged, and if the defrosting exiting condition is met, the defrosting program is directly exited; and if the condition of exiting the defrosting is not met, gradually reducing the opening degree of the electronic throttling element to a defrosting set value (pset).
Specifically, as shown in fig. 1, during the defrosting operation, whether the refrigerant cycle system has a descending trend after a low-pressure rising state is monitored in real time, and if the refrigerant cycle system has the descending trend, the opening degree of the electronic throttling element is gradually increased to pmax.
With reference to the interval t3-t4 shown in fig. 2, in the interval, EXV is closed to a defrosting setting value, at this time, the oil return in the system is not in a good state, the oil shortage will cause great wear to the press for a long time, and the press will be in a fault, at this time, EXV needs to be opened up to pmax to increase the flow rate, so that the oil return of the press is good, and the function of slowing down the low-pressure falling rate and the high-pressure rising rate can be achieved.
Meanwhile, if the low-pressure rising state of the refrigerant circulating system is monitored in real time in the defrosting operation process and then the low-pressure rising state does not have the descending trend, the monitoring is continued.
In the embodiment, preferably, in the defrosting operation process, whether the refrigerant circulation system has a descending trend after the low-pressure ascending state is monitored in real time, if so, whether the defrosting condition is met or not is judged, and if the defrosting condition is met, the defrosting program is directly quitted; and if the condition of exiting defrosting is not met, gradually increasing the opening degree of the electronic throttling element to pmax.
Specifically, whether a steep rising trend exists in the high-pressure rising process of the refrigerant circulation system is monitored in real time during the defrosting operation process, and if the steep rising trend exists, the opening degree of the electronic throttling element is gradually reduced to p set.
In conjunction with the interval T4-T5 of fig. 2, during which the temperature of the outer disc is rapidly raised for further enhancing the defrosting effect, the valve is gradually closed again until the outer disc reaches the minimum defrosting setting (pset) until the outer disc reaches the exit condition (tset) or the maximum defrosting time (T5) and then the outer disc exits the defrosting.
Meanwhile, if the high pressure of the refrigerant circulating system does not rise in real time in the defrosting operation process, monitoring is continued.
In this embodiment, preferably, in the defrosting operation process, a trend of whether a high pressure of the refrigerant circulation system rises steeply (steep rise refers to a change of a rising rate in each minimum monitoring time, and the rising rate is determined as steep rise when reaching a preset threshold) is monitored in real time, if the trend of steep rise is detected, whether a defrosting exit condition is met is determined, and if the defrosting exit condition is met, the defrosting program is directly exited; and if the condition of exiting defrosting is not met, gradually reducing the opening degree of the electronic throttling element to p set.
And S4, finally, when the condition of defrosting exiting is met, exiting the defrosting mode. The defrosting exiting condition in the step and the above steps means that the temperature of the outer disc reaches a preset threshold T set, and the defrosting program exits when the temperature of the outer disc reaches the preset threshold T set.
According to the air conditioner defrosting control method, the defrosting logic aims to abandon the traditional defrosting method, change a brand-new logic algorithm into the traditional defrosting method, and achieve the optimal defrosting effect by combining the microcosmic logic and the macroscopic logic, so that good heating performance is ensured, the service life of an air conditioning unit is prolonged, and the core competitiveness of a product is improved.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A defrosting control method for a direct expansion air conditioner is characterized by comprising the following steps: the method comprises the following steps:
s1, the air conditioner judges whether the air conditioner enters a defrosting mode according to the outdoor environment temperature and the low pressure value of the refrigerant circulating system;
s2, after the air conditioner enters a defrosting mode, the electronic throttling element starts to operate in an initial opening defrosting mode;
s3, monitoring the variation trend of the low pressure value of the refrigerant circulation system and the high pressure value of the refrigerant circulation system in real time in the defrosting operation process, and adjusting the opening of the electronic throttling element in real time according to the variation trend;
monitoring whether the refrigerant circulating system has a rising trend after a low-pressure descending state in real time in the defrosting operation process, and gradually reducing the opening of the electronic throttling element if the refrigerant circulating system has the rising trend;
if the low-pressure descending state of the refrigerant circulating system is monitored in real time in the defrosting operation process and the trend of rising is not generated, continuing monitoring;
monitoring whether the refrigerant circulating system has a descending trend after the low-pressure ascending state in real time in the defrosting operation process, and gradually increasing the opening of the electronic throttling element if the refrigerant circulating system has the descending trend; if the low-pressure rising state of the refrigerant circulating system is monitored in real time in the defrosting operation process and then the trend of falling does not exist, continuing monitoring;
monitoring whether a high-pressure rising process of a refrigerant circulating system has a steep rising trend in real time in a defrosting operation process, and gradually reducing the opening of the electronic throttling element if the high-pressure rising process of the refrigerant circulating system has the steep rising trend; if the high-pressure rising process of the refrigerant circulating system is not monitored in real time in the defrosting operation process, continuing monitoring;
and S4, when the condition of defrosting exiting is met, exiting the defrosting mode.
2. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: the step S1 entering the defrosting mode means that the outdoor ambient temperature and the low pressure value of the refrigerant cycle system reach preset thresholds.
3. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: step S2 the electronic throttle element starts the defrosting operation at the maximum opening degree.
4. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: monitoring whether a low-pressure descending state of a refrigerant circulating system has a rising trend in real time in a defrosting operation process, judging whether a defrosting exiting condition is met or not if the low-pressure descending state of the refrigerant circulating system has the rising trend, and directly exiting a defrosting program if the defrosting exiting condition is met; and if the condition of exiting defrosting is not met, gradually reducing the opening of the electronic throttling element.
5. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: monitoring whether a low-pressure rising state of a refrigerant circulating system has a descending trend in real time in a defrosting operation process, judging whether a defrosting exiting condition is met or not if the low-pressure rising state of the refrigerant circulating system has the descending trend, and directly exiting a defrosting program if the defrosting exiting condition is met; and if the condition of exiting defrosting is not met, gradually increasing the opening of the electronic throttling element.
6. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: monitoring whether a high-pressure rising process of a refrigerant circulating system has a steep rising trend in real time in a defrosting operation process, judging whether a defrosting exiting condition is met or not if the high-pressure rising process has the steep rising trend, and directly exiting a defrosting program if the defrosting exiting condition is met; and if the condition of exiting defrosting is not met, gradually reducing the opening of the electronic throttling element.
7. The defrosting control method of the direct expansion air conditioner according to claim 1, characterized in that: the step S4 of exiting the defrosting condition means that the outer tray temperature reaches a preset threshold.
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