CN110793096B - Air conditioning unit and control method and control device thereof - Google Patents
Air conditioning unit and control method and control device thereof Download PDFInfo
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- CN110793096B CN110793096B CN201911209900.6A CN201911209900A CN110793096B CN 110793096 B CN110793096 B CN 110793096B CN 201911209900 A CN201911209900 A CN 201911209900A CN 110793096 B CN110793096 B CN 110793096B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 286
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005057 refrigeration Methods 0.000 claims abstract description 7
- 238000010257 thawing Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 5
- 238000003491 array Methods 0.000 description 2
- 210000004899 c-terminal region Anatomy 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/42—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger characterised by the use of the condensate, e.g. for enhanced cooling
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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
- F24F11/62—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
- F24F11/62—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The air conditioning unit comprises an indoor unit and an outdoor unit, wherein the indoor unit is provided with a condensed water outlet, the outdoor unit comprises an outdoor heat exchanger and a compressor, the air conditioning unit also comprises a waterway system, the waterway system comprises a total water tank, a compressor water tank capable of exchanging heat with the compressor and a water heat exchanger capable of exchanging heat with the outdoor heat exchanger; the total water tank is switched to discharge water in two ways through a four-way valve, one way is connected to the first end of the compressor water tank through a first valve, and the second end of the compressor water tank is connected to the first end of the water heat exchanger; the other branch is divided into two branches after the second valve, wherein one branch is connected to the second end of the water heat exchanger, and the other branch is connected to a condensate water outlet of the indoor unit through the first valve. The invention can solve the problems of overhigh temperature of the refrigeration mode compressor, frosting of the outdoor heat exchanger in the heating mode and the like, and has the effect of improving the heat exchange efficiency.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner unit, a control method and a control device thereof.
Background
When the air conditioner is in refrigeration operation in summer, the outdoor temperature is high, and the phenomena of overhigh temperature of a compressor, even tripping protection and the like can occur. The existing air conditioner generally protects the compressor by reducing the operation frequency of the compressor, but the method is easy to cause the phenomenon of insufficient indoor cooling capacity and temperature fluctuation. When the air conditioner is in heating operation in winter, the outdoor temperature is low, frosting can be formed on the outdoor heat exchanger, so that the air quantity is reduced, the heat exchange efficiency is reduced, and when the conventional air conditioner is frosted outdoors, the refrigerating mode is switched by the four-way valve to defrost the outdoor heat exchanger, so that the outdoor heating is realized, and the defrosting effect is achieved; but the indoor temperature is unstable because the indoor unit does not heat in the defrosting process.
Disclosure of Invention
The invention solves the problems of overhigh temperature of a refrigeration mode compressor, frosting of an outdoor heat exchanger in a heating mode and the like.
In order to solve the above problems, as one aspect of the present invention, there is provided an air conditioning unit including an indoor unit having a condensed water outlet and an outdoor unit including an outdoor heat exchanger and a compressor, wherein the air conditioning unit further includes a waterway system including a total water tank, a compressor water tank capable of exchanging heat with the compressor, and a water heat exchanger capable of exchanging heat with the outdoor heat exchanger; the total water tank is switched to discharge water in two ways through a four-way valve, one way is connected to the first end of the compressor water tank through a fourth valve, and the second end of the compressor water tank is connected to the first end of the water heat exchanger; the other branch is divided into two branches after the second valve, wherein one branch is connected to the second end of the water heat exchanger, and the other branch is connected to a condensate water outlet of the indoor unit through the first valve.
Therefore, the invention adds the waterway system on the existing air conditioning system, and reduces the temperature of the compressor by utilizing the condensed water of the indoor unit or the water of the total water tank during refrigeration by controlling the waterway operation, so that the compressor keeps high-frequency operation, and the water heat exchanger can reduce the condensation temperature and improve the condensation heat exchange quantity, thereby improving the heat exchange efficiency of the outdoor heat exchanger; when heating, the water of the total water tank absorbs the heat generated by the compressor, and flows through the condenser to release the heat, so that the defrosting without stopping is realized, the heat exchange efficiency can be improved, the indoor temperature fluctuation is small, and the comfort level of a human body is improved.
In some embodiments of the present invention, the total water tank is formed between the double-layered hollow shells by providing a wind blocking riser having a double-layered hollow shell inside the outdoor unit; or the total water tank is arranged between the fan blade of the external machine and the outdoor heat exchanger, and has the advantages of simple structure and convenient installation.
In some embodiments of the present invention, the compressor water tank is formed by providing an annular cavity at the periphery of the compressor, so that a larger heat exchange area between the compressor water tank and the compressor is ensured, and the compressor is cooled advantageously.
In some embodiments of the invention, the water heat exchanger comprises a condensate pipe coiled on the outdoor heat exchanger; wherein the condenser water pipe is fixed on the outdoor heat exchanger through a limiting buckle. Therefore, the water heat exchanger can have a larger heat exchange area with the outdoor heat exchanger, and the defrosting effect can be improved.
In some embodiments of the invention, a water outlet communicated with the outside is arranged at the bottom of the total water tank and/or the compressor water tank, and a valve is arranged at the water outlet for replacing water in the total water tank or the compressor water tank or adjusting the water quantity of the waterway system.
As another aspect of the present invention, there is provided a control method of an air conditioning unit as described above, the control method including controlling a water pump, a four-way valve, and a valve of the air conditioning unit to perform the steps of: in a refrigeration mode, according to the exhaust temperature of the compressor, the condensed water of the indoor unit or the water of the total water tank sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively; in the heating mode, the water of the total water tank sequentially passes through the compressor water tank and the water heat exchanger to defrost the outdoor heat exchanger according to the temperature of the outer disc of the outdoor heat exchanger and the water temperature of the compressor water tank.
Based on the control method, proper waterway operation is selected according to the exhaust temperature of the compressor in a refrigeration mode to cool the compressor, so that the heat exchange efficiency is improved; the outdoor heat exchanger can be used for defrosting without stopping according to the outer disc temperature of the outdoor heat exchanger and the water tank temperature of the compressor through waterway operation in a heating mode, and meanwhile, the compressor can be properly cooled.
In some embodiments of the present invention, the step of cooling the outdoor heat exchanger and the compressor by sequentially passing condensed water of the indoor unit or water of the total water tank through the water heat exchanger and the compressor water tank according to the discharge temperature of the compressor includes: when the difference value between the exhaust temperature of the compressor and the exhaust set temperature is larger than a first threshold value, the water of the total water tank sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively; when the difference value between the exhaust temperature of the compressor and an exhaust set temperature is smaller than a second threshold value, the condensed water of the indoor unit sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively, wherein the second threshold value is smaller than the first threshold value; and when the difference value between the exhaust temperature of the compressor and an exhaust set temperature is smaller than or equal to a first threshold value and larger than or equal to a second threshold value, controlling to keep the former state unchanged.
In some embodiments of the present invention, the step of defrosting the outdoor heat exchanger by sequentially passing water of the total water tank through the compressor water tank and the water heat exchanger according to the temperature of the outer plate of the outdoor heat exchanger and the water temperature of the compressor water tank includes: when the water temperature of the compressor water tank is larger than or equal to the set water temperature of the compressor water tank or when the difference value between the outer disc temperature of the outdoor heat exchanger and the set temperature of the outer disc is smaller than or equal to a third threshold value, the water of the total water tank sequentially passes through the compressor water tank and the water heat exchanger to defrost the outdoor heat exchanger; when the water temperature of the compressor water tank is smaller than the set water temperature of the compressor water tank and the difference value between the outer disc temperature of the outdoor heat exchanger and the set temperature of the outer disc is larger than or equal to a fourth threshold value, defrosting is not carried out, wherein the fourth threshold value is larger than the third threshold value; when the difference between the outer disc temperature of the outdoor heat exchanger and the outer disc set temperature is larger than the third threshold value and smaller than the fourth threshold value, the control keeps the former state unchanged.
Based on the embodiment, in the practical application process, reasonable set temperature and corresponding threshold values can be selected according to experience, so that the waterway operation mode can be reasonably selected according to actual needs when the air conditioning unit is operated, and the overall stability and reliability of the system are ensured.
As still another aspect of the present invention, there is provided a control apparatus of an air conditioning unit including a controller for controlling a water pump, a four-way valve, and a valve of the air conditioning unit to perform the control method as described above.
Drawings
FIG. 1 is a schematic diagram of an overall structure of an air conditioning unit according to an embodiment of the present invention;
FIG. 2 is a schematic top view illustrating an outdoor unit structure of an air conditioning unit according to an embodiment of the present invention;
FIG. 3 is a schematic rear view illustrating an outdoor unit structure of an air conditioning unit according to an embodiment of the present invention;
FIG. 4 is a control flow chart of a cooling mode of an air conditioning unit according to an embodiment of the present invention;
Fig. 5 is a control flow chart of a heating mode of an air conditioning unit according to an embodiment of the present invention.
In the above figures, the reference numerals have the following meanings:
1-indoor unit, 2-first valve, 3-condenser water pipe,
4-Second valve, 5-water inlet, 6-third valve,
7. 14-A water outlet, 8-a total water tank and 9-a water pump,
10-Four-way valve, 11-fourth valve, 12-compressor,
13-Fifth valve, 15-compressor water tank, 16-outdoor heat exchanger,
17-Water heat exchanger, 18-limit buckle, 19-outer machine fan blade.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Example 1
As a first exemplary embodiment of the present invention, an air conditioning unit is provided. Fig. 1 is a schematic diagram of the overall structure of an air conditioning unit according to an embodiment of the present invention, please refer to fig. 1, in which a water path system is added to an existing air conditioning system, the existing air conditioning system generally includes an indoor unit 1 and an outdoor unit, the indoor unit has a condensed water outlet K5, the outdoor unit includes an outdoor heat exchanger 16 and a compressor 12, the water path system includes a total water tank 8, a compressor water tank 15 capable of exchanging heat with the compressor 12, and a water heat exchanger 17 capable of exchanging heat with the outdoor heat exchanger 16; the total water tank 8 is switched to discharge water in two ways through the four-way valve 10, one way is connected to the first end K1 of the compressor water tank 15 through the fourth valve 11, and the second end K2 of the compressor water tank 15 is connected to the first end K3 of the water heat exchanger 17; the other branch is divided into two branches after the second valve 4, wherein one branch is connected to the second end K4 of the water heat exchanger 17, and the other branch is connected to the condensed water outlet K5 of the indoor unit 1 through the first valve 2.
In this embodiment, the four-way valve 10 has four ports, i.e., a C-terminal, a D-terminal, an S-terminal, and an E-terminal, as a component capable of changing a fluid flow channel, and the D-terminal and the E-terminal are connected under the power-on condition and the D-terminal and the C-terminal are connected under the power-off condition, so that different waterway operation directions in the cooling mode and the heating mode can be realized by controlling the power-on condition.
Specifically, when the four-way valve 10 is not electrified, condensed water generated by the indoor unit or water in the total water tank sequentially passes through the water heat exchanger 17 and the compressor water tank 15, and the temperature of the condenser is about 40-50 ℃, the temperature of the compressor is 80-100 ℃, and the temperature of the condensed water generated by the indoor unit or the water in the total water tank is still not higher than 50 ℃ after passing through the water heat exchanger, so that the temperature of the compressor can be continuously reduced, the condensing temperature in the refrigerating process can be reduced, and the heat exchange efficiency is improved; the water may be discharged directly from the system after passing through the compressor water tank 15 or returned to the main water tank 8. Of course, the water in the main tank may be used to cool the outdoor heat exchanger 16 and the compressor 12 in other non-heating modes.
When the four-way valve 10 is electrified, water of the total water tank sequentially passes through the compressor water tank 15 and the water heat exchanger 17, heat of the compressor can be absorbed after passing through the compressor water tank 15, and the water heat exchanger 17 emits heat so as to defrost the outdoor heat exchanger 16, and then the water returns to the total water tank, so that defrosting without shutdown is realized, the heat exchange efficiency is improved, the indoor temperature fluctuation is small, and the comfort level of a human body is improved.
Fig. 2 is a schematic top view illustrating an outdoor unit structure of an air conditioning unit according to an embodiment of the present invention, and fig. 3 is a schematic rear view illustrating an outdoor unit structure according to an embodiment of the present invention. In this embodiment, referring to fig. 2 and 3, the water circuit system is integrally disposed on the outdoor unit.
Specifically, through setting up the separate wind riser that has double-deck hollow shell in the off-premises station, form total water tank 8 between this double-deck hollow shell, only need from this to separate wind riser structure transformation can form total water tank 8, simple structure, simple to operate. In other embodiments, the total water tank 8 may also be disposed between the outdoor fan blade 19 and the outdoor heat exchanger 16, or other locations where convenient placement is desired.
In the present embodiment, an annular cavity is provided at the outer periphery of the compressor 12 to form the compressor water tank 15 so that a large heat exchange area is provided between the compressor 12 and the compressor water tank 15. The water heat exchanger 17 comprises a condensate pipe coiled on the outdoor heat exchanger 16, and it is understood that the condensate pipe is coiled to help to enlarge the heat exchange area, and the condensate pipe is fixed on the outdoor heat exchanger 16 through a limiting buckle 18, so as to exchange heat with the outdoor heat exchanger 16.
In this embodiment, the bottom of the total water tank 8 is further provided with a drain opening 7 communicating with the outside, a third valve 6 is provided at the drain opening 7, and/or the bottom of the compressor water tank 15 is further provided with a drain opening 14 communicating with the outside, and a fifth valve 13 is provided at the drain opening 14. The water in the waterway system is replaced or the water quantity is adjusted through the water outlets 7 and 14.
In this embodiment, the total water tank 8 is further provided with a water inlet 5, so that water is automatically added into the water path system for circulation, and besides the water is automatically added, the water in the water path system further includes condensed water of the indoor unit 1. A water pump 9 is arranged between the total water tank 8 and the four-way valve 10, and the total water tank 8 pressurizes water through the water pump 9 and then discharges water through the four-way valve 10.
Example 2
Based on the air conditioning unit of embodiment 1, this embodiment provides a control method of the air conditioning unit. FIG. 4 is a control flow chart of a cooling mode of an air conditioning unit according to an embodiment of the present invention; fig. 5 is a control flow chart of a heating mode of an air conditioning unit according to an embodiment of the present invention.
Referring to fig. 4 and 5, the control method includes controlling a water pump, a four-way valve, a valve, etc. of an air conditioning unit to perform the following steps: in the cooling mode, according to the exhaust temperature of the compressor 12, the condensed water of the indoor unit 1 or the water of the total water tank 8 sequentially passes through the water heat exchanger 17 and the compressor water tank 15 to cool the outdoor heat exchanger 16 and the compressor 12 respectively; in the heating mode, the water of the total water tank 8 is sequentially passed through the compressor water tank 15 and the water heat exchanger 27 to defrost the outdoor heat exchanger according to the outer plate temperature of the outdoor heat exchanger 16 and the water temperature of the compressor water tank 15.
Referring to fig. 4, in the cooling mode, according to the exhaust temperature of the compressor 12, the steps of cooling the outdoor heat exchanger 16 and the compressor 12 by passing condensed water of the indoor unit 1 or water of the total water tank 8 through the water heat exchanger 17 and the compressor water tank 15 in sequence include:
Step S1: when the difference between the exhaust temperature T Exhaust gas of the compressor and an exhaust set temperature T Exhaust gas setting is larger than a first threshold value delta T 1, the water in the total water tank 8 sequentially passes through the water heat exchanger 17 and the compressor water tank 15 to cool the outdoor heat exchanger and the compressor respectively;
The exhaust set temperature T Exhaust gas setting is preferably 100 ℃, and according to experience, when the exhaust temperature exceeds 100 ℃, the overall temperature of the compressor is also higher, and the risk of machine jump burnout exists. DeltaT 1 is an empirical value, and the range of the value is preferably 2-5 ℃.
Referring to fig. 1, in order to sequentially pass water in the total water tank 8 through the water heat exchanger 17 and the compressor water tank 15, the water pump 9 needs to be turned on, the four-way valve 10 is not electrified, so that the C end and the D end are communicated, the second valve 4 and the fourth valve 11 are opened, and the first valve 2, the third valve 6 and the fifth valve 13 are closed.
Step S2: when the difference between the exhaust temperature T Exhaust gas of the compressor 12 and an exhaust set temperature T Exhaust gas setting is smaller than a second threshold Δt 2, the condensed water of the indoor unit 1 is sequentially passed through the water heat exchanger 17 and the compressor water tank 15 to cool the outdoor heat exchanger 16 and the compressor 12, respectively, wherein the second threshold Δt 2 is smaller than the first threshold Δt 1; wherein DeltaT 2 is an empirical value, and the range of values is preferably-5-0 ℃.
Referring to fig. 1, in order to cool the outdoor heat exchanger 16 and the compressor 12 by passing the condensed water of the indoor unit 1 through the water heat exchanger 17 and the compressor water tank 15 in sequence, the water pump 9 needs to be turned off, the four-way valve 10 is not electrified, the C end is communicated with the D end, the E end is communicated with the S end, the first valve 2 and the fourth valve 11 are opened, the second valve 4, the third valve 6 and the fifth valve 13 are closed, and finally the condensed water returns to the total water tank 8 through the E end and the S end of the four-way valve 10. In other embodiments, the fourth valve 11 may be closed and the fifth valve 13 may be opened to allow condensate to flow directly out of the system.
Step S3: when the difference between the discharge temperature T Exhaust gas of the compressor 12 and a discharge set temperature T Exhaust gas setting is equal to or less than the first threshold Δt 1 and equal to or greater than the second threshold Δt 2, control keeps the previous state unchanged.
In this step, "control to keep the previous state unchanged" means to keep the current states of the water pump, the four-way valve, and the first to fifth valves unchanged.
Further, the embodiment further includes step S4: after the system is operated at 1 in one state, the exhaust temperature is re-detected to perform the control process of steps S1 to S3, and so on and so forth. Wherein Deltat 1 is an empirical value, and the value range is preferably 30 s-90 s.
Referring to fig. 5, in the heating mode, according to the temperature of the outer plate of the outdoor heat exchanger 16 and the water temperature of the compressor water tank 15, the step of defrosting the outdoor heat exchanger by sequentially passing the water of the total water tank 8 through the compressor water tank 15 and the water heat exchanger 27 includes:
Step S1': when the water temperature T compressor water temperature of the compressor water tank is larger than or equal to the set water temperature T Compressor set water temperature of the compressor water tank, defrosting the outdoor heat exchanger by sequentially passing the water of the total water tank through the compressor water tank and the water heat exchanger;
The water temperature T Compressor set water temperature of the water tank of the compressor is preferably 50-60 ℃, so that overheat of the compressor can be avoided, defrosting is performed after the water tank of the compressor reaches a certain temperature, and defrosting efficiency and heat exchange efficiency can be improved.
Referring to fig. 1, in order to sequentially pass the water in the total water tank 8 through the compressor water tank 15 and the water heat exchanger 27, the water pump 9 needs to be turned on, the four-way valve is electrified to enable the end D to be communicated with the end E, the end C to be communicated with the end S, the second valve 4 and the fourth valve 11 are opened, and the first valve 2, the third valve 6 and the fifth valve 13 are closed.
Step S2': if the water temperature T compressor water temperature of the compressor water tank is smaller than the set water temperature T Compressor set water temperature of the compressor water tank, and when the difference value between the outer disc temperature T Outer disc of the outdoor heat exchanger and the outer disc set temperature T external disk setting is smaller than or equal to a third threshold value delta T 3, the water of the total water tank 8 sequentially passes through the compressor water tank 15 and the water heat exchanger 17 to defrost the outdoor heat exchanger 16;
Wherein, the set temperature T external disk setting of the outer disc is preferably-3 ℃ to 0 ℃, more preferably-1 ℃, and according to experience, the outdoor heat exchanger below 0 ℃ can generate frosting, the temperature of the outer disc is too low, and the heat exchange can be influenced if the frosting layer is thicker. DeltaT 3 is an empirical value, preferably ranging from-3℃to 0 ℃.
Similar to step S1', the water pump 9 is turned on in this step, the four-way valve is energized to connect the D end with the E end, and the C end with the S end, to open the second valve 4, the fourth valve 11, and to close the first valve 2, the third valve 6, and the fifth valve 13.
Step S3': when the water temperature T compressor water temperature of the compressor water tank 15 is smaller than the set water temperature T Compressor set water temperature of the compressor water tank 15 and the difference between the outer plate temperature T Outer disc of the outdoor heat exchanger 16 and the outer plate set temperature T external disk setting is greater than or equal to a fourth threshold Δt 4, not defrosting, wherein the fourth threshold is greater than the third threshold; preferably, deltaT 4 is an empirical value ranging from 2℃to 5 ℃.
Referring to fig. 1, when defrosting is not performed, the water pump, the first valve to the fifth valve are closed, and the four-way valve is not electrified.
Step S4': when the difference between the outside plate temperature T external disk setting of the outdoor heat exchanger 16 and the outside plate set temperature T external disk setting is greater than the third threshold Δt 3 and less than the fourth threshold Δt 4, then control remains unchanged from the previous state.
Further, the present embodiment further includes step S5': after the system is operated at 2 in one state, T Outer disc and T compressor water temperature are re-checked to perform the control process of steps S1 'to S4', and so on and so forth. Wherein Deltat 2 is an empirical value, and the value range is preferably 30 s-90 s.
Secondly, the embodiment also provides a control device of the air conditioning unit, which comprises a controller for controlling the water pump, the four-way valve and the valve of the air conditioning unit so as to execute the control method.
Furthermore, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of an air conditioning unit as described in the above embodiments. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (8)
1. The control method of the air conditioning unit comprises an indoor unit and an outdoor unit, wherein the indoor unit is provided with a condensed water outlet, and the outdoor unit comprises an outdoor heat exchanger and a compressor;
The total water tank is switched to discharge water in two ways through a four-way valve, one way is connected to the first end of the compressor water tank through a fourth valve, and the second end of the compressor water tank is connected to the first end of the water heat exchanger; the other branch is divided into two branches after the second valve, wherein one branch is connected to the second end of the water heat exchanger, and the other branch is connected to a condensate water outlet of the indoor unit through the first valve;
the control method comprises the following steps of controlling a water pump, a four-way valve and a valve of an air conditioning unit:
In a refrigeration mode, according to the exhaust temperature of the compressor, the condensed water of the indoor unit or the water of the total water tank sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively;
Under the heating mode, according to the outer dish temperature of outdoor heat exchanger and the temperature of compressor water tank, the water of total water tank passes through compressor water tank and water heat exchanger in proper order and carries out defrosting to outdoor heat exchanger, specifically includes:
When the water temperature of the compressor water tank is larger than or equal to the set water temperature of the compressor water tank or when the difference value between the outer disc temperature of the outdoor heat exchanger and the set temperature of the outer disc is smaller than or equal to a third threshold value, the water of the total water tank sequentially passes through the compressor water tank and the water heat exchanger to defrost the outdoor heat exchanger; when the water temperature of the compressor water tank is smaller than the set water temperature of the compressor water tank and the difference value between the outer disc temperature of the outdoor heat exchanger and the set temperature of the outer disc is larger than or equal to a fourth threshold value, defrosting is not carried out, wherein the fourth threshold value is larger than the third threshold value; when the difference between the outer disc temperature of the outdoor heat exchanger and the outer disc set temperature is larger than the third threshold value and smaller than the fourth threshold value, the control keeps the former state unchanged.
2. The control method according to claim 1, wherein the total water tank is formed between double-layer casings by providing a wind blocking riser having the double-layer casings in the outdoor unit.
3. The control method according to claim 1, wherein the total water tank is disposed between the outdoor fan blade and the outdoor heat exchanger.
4. The control method according to claim 1, wherein the compressor water tank is formed by providing an annular cavity at an outer periphery of the compressor.
5. The control method according to claim 1, wherein the water heat exchanger includes a condensate pipe coiled on the outdoor heat exchanger; wherein the condenser water pipe is fixed on the outdoor heat exchanger through a limiting buckle.
6. The control method according to claim 1, characterized in that a drain opening communicating with the outside is further provided at the bottom of the total water tank and/or the compressor water tank, and a valve is provided at the drain opening.
7. The control method according to claim 1, wherein the step of cooling the outdoor heat exchanger and the compressor by passing condensed water of the indoor unit or water of the total water tank through the water heat exchanger and the compressor water tank in order according to the discharge temperature of the compressor, respectively, comprises:
when the difference value between the exhaust temperature of the compressor and the exhaust set temperature is larger than a first threshold value, the water of the total water tank sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively;
when the difference value between the exhaust temperature of the compressor and an exhaust set temperature is smaller than a second threshold value, the condensed water of the indoor unit sequentially passes through the water heat exchanger and the compressor water tank to cool the outdoor heat exchanger and the compressor respectively, wherein the second threshold value is smaller than the first threshold value;
and when the difference value between the exhaust temperature of the compressor and an exhaust set temperature is smaller than or equal to a first threshold value and larger than or equal to a second threshold value, controlling to keep the former state unchanged.
8. A control device of an air conditioning unit, characterized by comprising a controller for controlling a water pump, a four-way valve and a valve of the air conditioning unit to perform the control method according to any one of claims 1 to 7.
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| CN111473496B (en) * | 2020-04-29 | 2021-08-13 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device thereof and storage medium |
| CN115247907A (en) * | 2021-04-26 | 2022-10-28 | 苏州英维克温控技术有限公司 | Air conditioning unit and air conditioner |
| CN115218444A (en) * | 2022-07-14 | 2022-10-21 | 青岛海尔空调器有限总公司 | Control method and device of air conditioner, electronic equipment, storage medium and air conditioner |
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| CN204100447U (en) * | 2014-09-14 | 2015-01-14 | 深圳市沃森空调技术有限公司 | With the air-conditioner of heat storage |
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| CN109990499B (en) * | 2019-03-04 | 2021-02-19 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system without shutdown during defrosting |
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