CN110762788A - Air conditioner outdoor unit, circulating system and control method - Google Patents
Air conditioner outdoor unit, circulating system and control method Download PDFInfo
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- CN110762788A CN110762788A CN201910970156.5A CN201910970156A CN110762788A CN 110762788 A CN110762788 A CN 110762788A CN 201910970156 A CN201910970156 A CN 201910970156A CN 110762788 A CN110762788 A CN 110762788A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner outdoor unit, a circulating system and a control method, relates to the technical field of air conditioners and aims to solve the problem that condensation is easily generated due to unbalanced temperature of a plurality of compressor driving modules. The outdoor unit of the air conditioner comprises compressors, and a plurality of compressors are arranged in the outdoor unit; each compressor is correspondingly provided with a driving module, and the driving module is used for driving the corresponding compressor to operate; the heat exchange blocks are connected to each driving module, and the two heat exchange blocks on the two adjacent driving modules are connected with each other; the metal pipe is inserted into the heat exchange blocks, the metal pipe is used for circulating a refrigerant, and the heat exchange blocks are used for exchanging heat between the metal pipe and the driving module so as to reduce the temperature of the driving module. The air conditioner of the invention is used for regulating the air temperature.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner outdoor unit, a circulating system and a control method.
Background
The compressor of the existing air conditioner outdoor unit is driven by the driving module to operate, and the driving module is cooled by the refrigerant cooling system in the prior art, so that the safety problems of fire hazard and the like caused by the fact that the driving module is out of work due to overlarge temperature rise are prevented. The refrigerant heat dissipation has the advantages of high heat dissipation efficiency, convenience in control and the like compared with air cooling heat dissipation, and therefore, the refrigerant heat dissipation is widely applied to the outdoor unit of the air conditioner.
As for the high-power multi-connected air conditioner outdoor unit, two compressors are generally used for driving, so the electrical system has two driving modules, as shown in fig. 1, two heat exchange blocks 002 are arranged on the metal pipe 001 for circulating the refrigerant, and the two heat exchange blocks 002 are respectively fixedly connected with the circuit boards of the corresponding driving modules, thereby performing heat dissipation and cooling on the driving modules and the circuit boards.
However, when the outdoor unit operates, the two compressors operate independently, and the driving module corresponding to each compressor generates different heat during operation, so that the two driving modules have different cooling and heating degrees, and only one of the two compressors may operate, and the non-operating driving module does not generate heat, so that heat dissipation is not required.
The amounts of the refrigerants flowing in the metal pipes 001 are the same, so that the temperature of the driving module with low heat productivity is further reduced after heat exchange of the refrigerants, and therefore, a condensation phenomenon is easily generated on a circuit board of the driving module, the circuit board is short-circuited, and dangers are caused.
Disclosure of Invention
Embodiments of the present invention provide an outdoor unit of an air conditioner, a circulation system, and a control method, which can control heat transfer between driving modules, and improve the cold and hot balance between the driving modules, thereby preventing the driving modules from being in danger due to condensation caused by too low temperature of the driving modules.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides an outdoor unit of an air conditioner, including compressors, where the compressors are disposed inside the outdoor unit; each compressor is correspondingly provided with a driving module, and the driving module is used for driving the corresponding compressor to operate; the heat exchange blocks are connected to each driving module, and the two heat exchange blocks on the two adjacent driving modules are connected with each other; the metal pipe is inserted into the heat exchange blocks, the metal pipe is used for circulating a refrigerant, and the heat exchange blocks are used for exchanging heat between the metal pipe and the driving module so as to reduce the temperature of the driving module.
According to the outdoor unit of the air conditioner, the two adjacent heat exchange blocks are connected together, so that the heat of the driving module with higher heat generation quantity can be transferred to the driving module with lower heat generation quantity, the heat of the two adjacent driving modules is relatively balanced, and the conditions that the driving module generates condensation phenomenon, short circuit and the like due to the fact that the temperature of one driving module is lower are avoided.
The embodiment of the second aspect of the invention also provides a circulating system of the air conditioner, which comprises a supercooling heat exchanger, a main electronic expansion valve, an outdoor heat exchanger and a four-way valve, wherein the supercooling heat exchanger, the main electronic expansion valve, the outdoor heat exchanger and the four-way valve are arranged in the outdoor unit and are sequentially communicated through a main circulating liquid pipe, the main circulating liquid pipe is communicated with the indoor unit, a compressor and a gas-liquid separator are further connected to the four-way valve, the compressor is communicated with the gas-liquid separator, the gas-liquid separator is communicated with the supercooling heat exchanger, a cooling circulating branch is arranged on the main circulating liquid pipe and is communicated with the metal pipe, and an auxiliary electronic expansion valve.
The circulation system of the outdoor unit of an air conditioner according to the embodiments of the present invention solves the same problems and achieves the same technical effects as the outdoor unit of an air conditioner according to the first aspect, and therefore, the description thereof is omitted.
In an embodiment of the third aspect of the present invention, there is provided a control method of the above circulation system, where a temperature sensor is disposed in each of the driving modules, and the temperature sensor is configured to detect a temperature of the driving module, the control method including:
monitoring the temperature of the driving module through the temperature sensor, setting a target temperature, wherein the target temperature is within a safe temperature range, and then adjusting an auxiliary electronic expansion valve to stabilize the temperature of the driving module within the target temperature;
when the temperature difference between the temperature of the driving module and the ambient temperature is lower than a first preset temperature, the set temperature value of the target temperature is increased, the opening degree of the auxiliary electronic expansion valve is reduced, the amount of refrigerant circulating in the metal pipe is reduced, the temperature of the driving module with the temperature difference lower than the first preset temperature is increased, and the temperature difference between the temperature of the driving module and the ambient temperature is higher than the first preset temperature.
In the control method of the above-mentioned circulation system provided by the embodiment of the present invention, each driving module is provided with a temperature sensor, so as to monitor the temperature of each driving module, and a temperature value is taken from a safe temperature interval and set as a target temperature, and then the opening of the auxiliary electronic expansion valve is continuously adjusted to stabilize the temperature of the driving module near the target temperature, so as to keep the temperature of the driving module in the safe temperature interval, when the temperature difference between the temperature of one or more driving modules and the ambient temperature is less than a first preset temperature, it is determined that the temperature of the driving module is too low, and there is a possibility of condensation, so that the temperature value of the set target temperature is increased, so as to reduce the opening of the auxiliary electronic expansion valve, reduce the amount of refrigerant in the metal pipe, that is, reduce the amount of heat taken away by the refrigerant, and increase the temperature of all driving modules, the heat conducting piece can transfer heat between the adjacent driving modules, so that the driving module with higher temperature transfers heat to the driving module with lower temperature, the temperature of the driving module with lower temperature is increased, the temperature difference between the temperature of the driving module with lower temperature and the ambient temperature is larger than a first preset temperature, and the condensation phenomenon is avoided; when the temperature difference between the temperature of each driving module and the ambient temperature is greater than a first preset temperature, the condensation risk is judged to be absent, at the moment, the set target temperature value is not required to be changed, only the auxiliary electronic expansion valve is required to be continuously adjusted, the temperature of the driving module is stabilized in a safe temperature range, and the phenomenon that condensation is generated due to the fact that the temperature of the driving module is too low is avoided.
Drawings
FIG. 1 is a schematic diagram of an overall structure of a metal tube and two heat exchange blocks disposed on the metal tube in the prior art;
fig. 2 is a schematic structural view of an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating an overall structure of a heat dissipating module for an outdoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a schematic view of the overall structure of a heat exchange block, a heat conducting member and a metal tube according to an embodiment of the present invention;
FIG. 5 is a schematic view of the heat exchange block and the heat conducting member according to the embodiment of the present invention;
FIG. 6 is a schematic structural view of a heat conducting member and a heat exchange block of the same structure and connected to each other according to an embodiment of the present invention;
FIG. 7 is a schematic view of an internal through hole of a heat exchange block provided in an embodiment of the present invention;
FIG. 8 is a perspective view of two heat exchange blocks and a heat conducting member integrally formed according to an embodiment of the present invention;
FIG. 9 is a front view of two heat exchange blocks integrally formed with a heat conductive member according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a first circulation system of an air conditioner according to an embodiment of the present invention;
fig. 11 is a schematic structural view of a second circulation system of an air conditioner according to an embodiment of the present invention;
fig. 12 is a flowchart of a method for controlling a circulation system of an air conditioner according to an embodiment of the present invention.
Reference numerals: 100. a heat exchange block; 110. a fixing plate; 120. a heat conducting portion; 121. a through hole; 200. a metal tube; 300. a heat conductive member; 400. a drive module; 410. a circuit substrate; 500 circulating the main liquid pipe; 510. a subcooling heat exchanger; 520. a main electronic expansion valve; 530. an outdoor heat exchanger; 540. a four-way valve; 550. a compressor; 560. a gas-liquid separator; 600. a cooling circulation branch; 610. an auxiliary electronic expansion valve.
Detailed Description
An outdoor unit of an air conditioner, a circulation system and a control method according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
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; 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.
In the outdoor unit of an air conditioner according to the embodiment of the present invention, a plurality of compressors 550 are disposed inside the outdoor unit, each compressor 550 is correspondingly provided with a driving module 400, as shown in fig. 2 and 3, each driving module 400 is connected to a heat exchange block 100, two heat exchange blocks 100 of two adjacent driving modules 400 are connected to each other, a same metal pipe 200 is inserted into the plurality of heat exchange blocks 100, the metal pipe 200 is used for circulating a refrigerant, and the heat exchange block 100 is used for exchanging heat between the metal pipe 200 and the driving module 400 to reduce the temperature of the driving module 400.
In the air conditioner provided by the embodiment of the invention, because the two adjacent heat exchange blocks 100 are connected with each other, the heat of the driving module 400 with higher heat generation quantity can be transferred to the driving module 400 with lower heat generation quantity, so that the heat of the two driving modules 400 is relatively balanced, and the conditions that the condensation phenomenon is generated on one driving module 400, the short circuit is caused and the like due to the lower temperature of the driving module 400 are avoided.
Preferably, in the outdoor unit of an air conditioner according to an embodiment of the present invention, two adjacent heat exchange blocks 100 are connected by a heat conduction member 300, and the heat conduction member 300 is used for transferring heat between the two heat exchange blocks 100. The two adjacent heat exchange blocks 100 are connected by one heat conduction member 300, so that the heat conduction efficiency between the two adjacent heat exchange blocks 100 is improved, and the heat is better transferred between the two adjacent driving modules 400.
The heat exchange block 100 provided in the embodiment of the present invention may adopt a thicker heat dissipation plate made of a heat conductive material, a through hole 121 is formed in the heat dissipation plate along a direction parallel to the plate surface, a metal pipe 200 is inserted into the through hole 121, and then the heat dissipation plate is fixedly connected to the driving module 400, or the heat exchange block 100 may be configured as follows, as shown in fig. 4 and 5, the heat exchange block 100 includes a fixing plate 110 and a heat conduction part 120 disposed on the fixing plate 110, as shown in fig. 6, a through hole 121 is formed in the heat conduction part 120 along the length direction of the fixing plate 110, the metal pipe 200 is inserted into the through hole 121, the fixing plate 110 is connected to the driving module 400, and the fixing plate 110 and the heat conduction part 120 are made of the same material and are formed as an integral structure.
Among the above-mentioned technical scheme who adopts the heating panel, because need insert the tubular metal resonator 200 that is used for the circulation refrigerant in the heating panel, consequently, the thickness of heating panel will be greater than the external diameter of tubular metal resonator 200 at least, however, the inside of heating panel does not set up the part of tubular metal resonator 200 and needs pass through screw connection with drive module 400, because the whole of heating panel is thick, consequently, it is comparatively inconvenient to lead to the trompil, the technology degree of difficulty has been increased, and because the heating panel is whole thick, the cold volume transmission to the monoblock heating panel of tubular metal resonator 200 inner loop refrigerant reduces relatively, and further reduced the transmission efficiency that cold volume transmitted to drive module 400.
Compared with the above technical solution of the heat dissipation plate, in the technical solution of providing the heat conduction portion 120 on the fixing plate 110 according to the embodiment of the present invention, as shown in fig. 6 and 7, the through hole 121 for accommodating the metal pipe 200 is formed in the inside of the heat conduction portion 120, so that the thickness of the fixing plate 110 does not need to be set too thick, and since the thickness of the fixing plate 110 is small, as shown in fig. 3, the cooling capacity of the refrigerant circulating in the metal pipe 200 can be more quickly transmitted to the driving module 400, thereby improving the efficiency of cooling capacity transmission, facilitating the cooling of the driving module 400, and ensuring the stable operation of the driving module 400.
The heat conducting member 300 according to an embodiment of the present invention is used for connecting two heat exchange blocks 100, so as to transfer heat between the two heat exchange blocks 100, the heat conducting member 300 may be connected to the bottom surfaces of the two heat exchange blocks 100 by using a connecting plate made of a heat conducting material, so as to transfer heat between the two heat exchange blocks 100, or may be in the same structure as the heat exchange blocks 100, as shown in fig. 5 and 6, and connects the two heat exchange blocks 100 into a whole, and the heat conducting member 300 is tightly connected to the end surfaces of the heat exchange blocks 100. The technical scheme of two heat transfer blocks 100 are connected through the connecting plate that the heat conduction material was made, because the connecting plate is connected with the bottom surface of heat transfer block 100, the connecting plate has been increased between heat transfer block 100 and drive module 400 promptly, the thickness between tubular metal resonator 200 and the drive module 400 has been increased promptly, be unfavorable for cold volume to drive module 400 transmission, compare in this scheme, set up heat conduction piece 300 into the structure the same with heat transfer block 100, and with the terminal surface zonulae occludens of heat conduction piece 300 with heat transfer block 100, thereby need not increase other structures between heat transfer block 100 and the drive module 400, can enough transmit the heat of two heat transfer blocks 100, do not influence the cold volume of refrigerant in the tubular metal resonator 200 again and to the efficiency of drive module 400 transmission.
In addition, the heat conducting member 300 and the heat exchange block 100 may be made of different heat conducting materials, and end surfaces of the heat conducting member 300 and the heat exchange block 100 are fixedly and tightly connected by welding or other processes, so as to ensure heat transfer efficiency between the heat exchange blocks 100, or the heat conducting member 300 and the heat exchange block 100 may be made of the same material and integrally formed. Compared with the scheme that the heat conducting piece 300 and the heat exchange block 100 are made of the same material and integrally formed, as shown in fig. 8 and 9, namely, the scheme adopts the lengthened heat exchange block 100, two ends of the lengthened heat exchange block 100 are respectively connected with the two driving modules 400, when the difference between the cold and heat of the two driving modules 400 is large, heat is directly transmitted through the lengthened heat exchange block 100, and the heat exchange block 100 is of an integrally formed structure, so that a connection gap does not exist, and the heat conduction efficiency cannot be reduced.
Preferably, as shown in fig. 3 and 4, the driving module 400 is disposed on a circuit substrate 410, the fixing plate 110 is closely attached to the circuit substrate 410, and the circuit substrate 410 can transmit the cooling capacity of the refrigerant to the driving module 400 to reduce the temperature of the driving module 400. The area of the fixing plate 110 not provided with the heat conducting portion 120 and the circuit board 410 are fixedly connected by screws, and the plate surface of the fixing plate 110 is closely attached to the circuit board 410, so that the temperature of the driving module 400 is reduced by the circuit board 410.
Preferably, the outer wall of the metal pipe 200 is closely attached to the inner wall of the through hole 121 by the metal pipe 200 in a pipe expansion manner. The outer wall of the metal pipe 200 is closely attached to the inner wall of the through hole 121 of the heat exchange block 100, so that the cooling capacity of the refrigerant inside the metal pipe 200 and the heat of the driving module 400 absorbed by the heat exchange block 100 can exchange heat better, the heat of the driving module 400 can be reduced, and the driving module 400 can operate normally.
In order to better reduce the heat generated by the driving module 400, adding the cooling medium is the most direct method, therefore, the metal tube 200 can be bent to form a plurality of parallel sections, thereby increasing the contact area of the metal tube 200 with the heat exchange block 100, however, since the driving module 400 is generally a chip, its volume is small, the circuit substrate 410 is also small in volume, and if too many parallel tube segments are arranged in the metal tube 200, the volume of the heat exchange block 100 is increased, thereby increasing the overall cost of the heat exchange block 100, and therefore, the metal pipe 200 provided by the embodiment of the present invention is preferably a U-shaped pipe, as shown in fig. 3 and 4, the heat exchange block 100 includes two heat conduction parts 120 respectively disposed at two side edges of the fixing plate 110 in the length direction, two straight pipe sections of the U-shaped pipe are inserted into the through holes 121 in the two heat conducting parts 120, respectively. The metal pipe 200 is of a U-shaped pipe structure, only two pipe sections which are parallel to each other are arranged, so that not only is the cost not increased, but also the contact area between the metal pipe 200 and the heat exchange block 100 is increased, the quantity of refrigerants which circulate in the heat exchange block 100 in unit time is increased, namely, the cold quantity provided by the refrigerants is increased, more cold quantity can be transmitted to the driving module 400, and the temperature of the driving module 400 is reduced.
Preferably, the metal tube 200 provided by the embodiment of the present invention is a copper tube. The copper pipe has the advantages of good heat-conducting property, corrosion resistance, high low-temperature strength and the like.
Preferably, the heat exchange block 100 provided by the embodiment of the present invention is made of aluminum. The metal aluminum has the advantages of low price, good heat-conducting property and the like, so that the cost can be reduced on the premise of ensuring better heat-conducting efficiency.
The embodiment of the present invention further provides a circulation system of an outdoor unit of an air conditioner according to the above technical solution, as shown in fig. 3 and 10, the circulation system includes a supercooling heat exchanger 510, a main electronic expansion valve 520, an outdoor heat exchanger 530 and a four-way valve 540, which are disposed inside the outdoor unit and sequentially communicated with each other through a main circulation pipe 500, the main circulation pipe 500 is communicated with the indoor unit, the four-way valve 540 is further connected with a compressor 550 and a gas-liquid separator 560, the compressor 550 is communicated with the gas-liquid separator 560, the gas-liquid separator 560 is communicated with the supercooling heat exchanger 510, the main circulation pipe 500 is provided with a cooling circulation branch 600, the cooling circulation branch 600 is communicated with the metal pipe 200, and the cooling circulation branch 600 is provided with an auxiliary electronic expansion valve 610.
The circulating system provided by the embodiment of the invention has the same technical problems and technical effects as the air conditioner, and therefore, the details are not repeated.
The cooling circulation branch 600 according to the embodiment of the present invention is disposed between the supercooling heat exchanger 510 and the outdoor heat exchanger 530, and is connected in parallel to the main electronic expansion valve 520, as shown in fig. 3 and 10. When heating, the liquid refrigerant enters the cooling circulation branch 600 from the main circulation pipe 500, exchanges heat with the driving module 400 in the metal pipe 200, takes away the heat of the driving module 400, throttles at the auxiliary electronic expansion valve 610, becomes a low-temperature and low-pressure refrigerant, and then enters the outdoor heat exchanger 530; during cooling, the liquid refrigerant flowing out of the outdoor heat exchanger 530 passes through the main circulation pipe 500, then passes through the auxiliary electronic expansion valve 610, then passes through the driving module 400, carries away heat of the driving module 400, and then flows back to the main circulation pipe 500 again, and then flows into the supercooling heat exchanger 510. In the circulation process, the temperature of the driving module 400 can be adjusted by adjusting the opening degree of the auxiliary electronic expansion valve 610, when the temperature of the driving module 400 is high, the opening degree of the auxiliary electronic expansion valve 610 is controlled to increase, so that the amount of the refrigerant in the cooling circulation branch 600 is increased, and the temperature of the driving module 400 is reduced, when the temperature of the driving module 400 is low, the opening degree of the auxiliary electronic expansion valve 610 is controlled to decrease, so that the amount of the refrigerant in the cooling circulation branch 600 is reduced, the driving module 400 can generate heat, the temperature of the driving module 400 is increased, so that the temperature of the driving module 400 is regulated, heat can be transferred between the driving modules 400 through the heat conducting piece 300, and the balance among the driving modules 400 is further improved.
It should be noted that, in the above-mentioned circulation system, since the main electronic expansion valve 520 and the auxiliary electronic expansion valve 610 are connected in parallel, the main electronic expansion valve 520 and the auxiliary electronic expansion valve 610 are required to be adjusted to be used with each other, when the temperature of the driving module 400 is higher than the safety interval and the opening degree of the auxiliary electronic expansion valve 610 is close to being fully opened, at this time, since the auxiliary electronic expansion valve 610 is close to being fully opened and the temperature of the driving module 400 still exceeds the safety interval, it is described that the amount of refrigerant in the cooling circulation branch 600 is insufficient at this time, the opening degree of the main electronic expansion valve 520 can be adjusted, that is, the opening degree of the main electronic expansion valve 520 is reduced, so as to reduce the amount of refrigerant passing through the circulation main liquid pipe 500, thereby increasing the amount of refrigerant entering the cooling circulation branch 600, increasing the amount of cold for reducing the temperature of the driving, preventing damage to the driving module 400 due to excessive temperatures. For example, the opening degree of the auxiliary electronic expansion valve 610 may be set to 85% of the fully opened state, and when the temperature of the driving module 400 exceeds the safety interval and the opening degree of the auxiliary electronic expansion valve 610 is greater than 85% of the fully opened state, the opening degree of the main electronic expansion valve 520 is controlled to be decreased, so that the refrigerant amount of the cooling cycle branch 600 is increased.
The cooling circulation branch 600 provided by the embodiment of the present invention is disposed at one end of the supercooling heat exchanger 510 close to the indoor unit, and an outlet of the auxiliary electronic expansion valve 610 is communicated with the supercooling heat exchanger 510, as shown in fig. 3 and 11. The cooling circulation branch 600 is arranged at one end of the supercooling heat exchanger 510 close to the indoor unit, and the electronic expansion valve at the inlet of the supercooling heat exchanger 510 can be replaced by the auxiliary electronic expansion valve 610, namely only two electronic expansion valves are arranged in the circulation system, so that the cost is reduced; and when the circulation structure is used for refrigeration or heating, the circulation directions of the cooling circulation branch 600 are the same, that is, liquid refrigerant enters the cooling circulation branch 600 from the main circulation pipe 500 and takes away heat in the driving module 400, then is throttled at the auxiliary electronic expansion valve 610 to become low-temperature and low-pressure refrigerant, exchanges heat with the refrigerant in the main circulation pipe 500 through the supercooling heat exchanger 510, cools the refrigerant in the main circulation pipe 500, improves the supercooling degree of the refrigerant, absorbs heat through the low-temperature and low-pressure refrigerant in the cooling circulation branch 600, heats up, returns to the gas-liquid separator 560, and then enters the compressor 550. In the circulation process, the temperature of the driving module 400 is also adjusted by adjusting the opening degree of the auxiliary electronic expansion valve 610, when the temperature of the driving module 400 is high, the opening degree of the auxiliary electronic expansion valve 610 is controlled to increase, so that the amount of the refrigerant in the cooling circulation branch 600 is increased, and the temperature of the driving module 400 is reduced, when the temperature of the driving module 400 is low, the opening degree of the auxiliary electronic expansion valve 610 is controlled to decrease, so that the amount of the refrigerant in the cooling circulation branch 600 is reduced, the driving module 400 can generate heat, the temperature of the driving module 400 is increased, so that the temperature of the driving module 400 is regulated and controlled, and heat can be transferred between the driving modules 400 through the heat conducting piece 300, so that the balance among the driving modules 400 is further improved.
An embodiment of the present invention provides a method for controlling a circulation system according to the above technical solution, a flowchart of the method is shown in fig. 12, each of the driving modules 400 is provided with a temperature sensor, and the temperature sensor is configured to detect a temperature of the driving module 400, and the method for controlling the circulation system includes: the temperature Ta of the drive module 400 is monitored by the temperature sensor and a target temperature Tft is set, and the target temperature Tft is within a safe temperature interval, i.e. the target temperature Tft is met, Tmin < Tft < Tmax, and the target temperature Tft is equal to an ambient temperature Tb + deviation Td, which is used to ensure that the temperature of the drive module 400 is higher than the ambient temperature, which is a minimum deviation value to ensure no risk of condensation, e.g. 15 ℃ < Td < 25 ℃, and then the auxiliary electronic expansion valve 610 is adjusted to stabilize the temperature of the drive module 400 at the target temperature.
When the temperature difference Tc between the temperature Ta of the driving module 400 and the ambient temperature Tb is smaller than a first preset temperature t1, increasing the set temperature value of the target temperature, decreasing the opening degree of the auxiliary electronic expansion valve 610, decreasing the amount of refrigerant circulating in the metal pipe 400, increasing the temperature of the driving module 400 whose temperature difference is smaller than the first preset temperature, and increasing the temperature difference between the temperature of the driving module 400 and the ambient temperature to be greater than the first preset temperature; when the temperature difference Tc between the temperature of each driving module 400 and the ambient temperature is greater than the first preset temperature t1, the temperature value of the target temperature does not need to be adjusted, and then the auxiliary electronic expansion valve 610 is continuously adjusted to stabilize the temperature of the driving module 400 within the target temperature.
In the control method of the above-mentioned circulation system according to the embodiment of the present invention, each driving module 400 is provided with a temperature sensor, so as to monitor the temperature of each driving module 400, and a temperature value is taken from a safe temperature interval and set as a target temperature, and then the opening degree of the auxiliary electronic expansion valve 610 is continuously adjusted, so that the temperature of each driving module 400 is stabilized near the target temperature, so that the temperature of each driving module 400 is in the safe temperature interval, when the temperature difference Tc between the temperature Ta of one or more driving modules 400 and the ambient temperature Tb is less than the first preset temperature t1, it is determined that the temperature of the driving module 400 is too low, and the condensation phenomenon may occur, so that the temperature value of the set target temperature is increased, the opening degree of the auxiliary electronic expansion valve 610 is decreased, and the refrigerant amount in the metal pipe 200 is reduced, that is, the heat taken away by the refrigerant is reduced, so that the temperature of all the driving modules 400 is increased, and the heat between the adjacent driving modules 400 can be transferred based on the heat-conducting member 300, so that the driving module 400 with high temperature transfers heat to the driving module 400 with low temperature, so that the temperature of the driving module with low temperature is increased, the temperature difference between the temperature of the driving module with low temperature and the ambient temperature is greater than a first preset temperature, and the condensation phenomenon is avoided; when the temperature difference Tc between the temperature of each driving module 400 and the ambient temperature is greater than the first preset temperature t1, it is determined that there is no condensation risk, and at this time, the temperature value of the target temperature does not need to be changed, and only the auxiliary electronic expansion valve 610 needs to be continuously adjusted to stabilize the temperature of the driving module 400 near the target temperature.
The control method of the embodiment of the invention sets a target temperature, monitors the temperature of the corresponding driving module through the temperature sensor, and continuously controls and adjusts the opening degree of the auxiliary electronic expansion valve 610 by taking the target temperature as the target value, namely adjusts the quantity of heat taken away by a refrigerant, so that the temperature of the driving module 400 is stabilized near the target temperature, and the phenomenon of condensation caused by too low temperature of the driving module 400 is avoided.
However, if the temperature of the driving module 400 is too high, the driving module 400 may be damaged, which may affect the normal operation of the outdoor unit, and therefore, as shown in fig. 12, when it is detected that the temperature Ta of the driving module 400 is higher than the target temperature Tft, the opening of the auxiliary electronic expansion valve 610 is increased, and the amount of refrigerant circulating in the metal pipe 200 is increased, so that the temperature of the driving module 400 detected to be higher than the target temperature is decreased, and the temperature of the driving module 400 is stabilized at the target temperature.
The temperature of each driving module 400 is monitored by a temperature sensor, when the temperature Ta of a driving module 400 is greater than the maximum Tmax of the safe temperature interval, it is determined that the temperature of the driving module 400 is too high, which may cause burnout and damage due to the too high temperature, at this time, the opening degree of the auxiliary electronic expansion valve 610 is increased, that is, the amount of refrigerant circulating in the metal pipe 200 is increased, heat generated by the driving module 400 is taken away by the refrigerant, so that the temperature of the driving module 400 whose detected temperature is greater than the maximum Tmax of the safe temperature interval is reduced, and the temperature of the driving module is within the safe temperature interval, and meanwhile, heat is transferred between the adjacent driving modules 400 by the heat conducting member 300, so that the temperatures of the driving modules 400 are more balanced, and the temperature of the driving modules 400 is prevented from being too high.
To sum up, the control method according to the embodiment of the present invention is configured to set a suitable target value, and then continuously adjust the opening of the auxiliary electronic expansion valve 610, that is, adjust the amount of the refrigerant, so as to stabilize the temperature of the driving module 400 at the target temperature, because the value of the target temperature is within the safe temperature range, the temperature of the driving module 400 can be ensured to be within the safe temperature range, specifically, when the temperature of the driving module 400 is too high, the opening of the auxiliary electronic expansion valve 610 is increased, that is, the amount of the refrigerant is increased, so as to decrease the temperature of the driving module 400 to the target temperature, and when the temperature of the driving module 400 is too low, the temperature value of the target temperature is increased, and at this time, the opening of the auxiliary electronic expansion valve 610 is decreased, that is, the amount of the refrigerant is decreased, so as to increase the temperature of the driving module 400, so as to continuously adjust the opening of, the temperature of the driving module 400 is stabilized at the target temperature, and it is ensured that the temperature of the driving module 400 is not too high or too low, thereby ensuring the normal and stable operation of the outdoor unit.
Furthermore, in the control method provided in the embodiment of the present invention, the temperature of each driving module 400 is monitored by a temperature sensor, a target temperature value is set, the temperature of the driving module 400 is continuously fed back in a PID control manner, the opening of the auxiliary electronic expansion valve 610 is continuously adjusted, the amount of refrigerant circulating in the metal pipe 200 is increased or decreased, the temperature of the driving module 400 is continuously adjusted, and finally the temperature of the driving module 400 is ensured to be stabilized within a safe temperature range, and heat is transferred between the driving modules 400 through the integrated structure of the heat exchange block 100 and the heat conducting member 300 during the adjustment process, so that the temperature between the driving modules 400 is more balanced, thereby effectively preventing the condensation problem of the driving module due to too low temperature, and ensuring that the driving module 400 can normally operate.
In the air conditioner with multiple compressors 550 provided by the embodiment of the present invention, when only one of all the compressors 550 needs to be operated, the driving module 400 near the inlet of the cooling circulation branch 600 is controlled to drive the corresponding compressor 550 to operate. Because the condition of the compressor 550 that is far away from the inlet of the cooling circulation branch 600 is operated, when the refrigerant enters from the inlet of the cooling circulation branch 600, because the inlet drive module 400 does not operate, heat dissipation is not needed, when the refrigerant passes through the drive module 400 at the inlet, the temperature of the drive module 400 at the inlet is further reduced, therefore, the condensation phenomenon is likely to occur, therefore, when only one compressor 550 needs to be operated, the operation of the compressor 550 at the inlet is controlled, when the refrigerant passes through the compressor 550, the temperature of the refrigerant is increased through heat exchange, and then when the refrigerant passes through the drive module 400 which does not operate at the back, the temperature of the drive module 400 which does not operate is not reduced, and the condensation phenomenon is prevented from occurring.
Further, when a plurality of compressors 550 need to be operated, the plurality of driving modules 400 near the inlet of the cooling circulation branch 600 are controlled to drive a corresponding plurality of compressors 550 to operate. Based on the above reasons, in order to prevent the non-operating driving module 400 from being cooled by the low-temperature refrigerant, which causes the condensation phenomenon, when a part of the compressors 550 is required to operate, the plurality of driving modules 400 close to the inlet of the cooling circulation branch 600 are controlled to operate in sequence, for example, two compressors 550 are required to operate, the first driving module 400 and the second driving module 400 closest to the inlet of the cooling circulation branch 600 are controlled to operate, when the refrigerant passes through the operating driving module 400 and exchanges heat, the temperature of the refrigerant is increased, thereby ensuring that the temperature of the non-operating driving module 400 is not too low when the refrigerant passes through the non-operating driving module 400, and preventing the condensation phenomenon from occurring on the driving module 400.
It should be noted that when one or more of the partial compressors 550 need to be operated, after the corresponding driving module 400 is started and the corresponding compressor 550 is driven to operate in the above manner, the target temperature is still set according to the aforementioned control method, and the temperature of the driving module 400 is adjusted to stabilize the temperature of the driving module 400 at the target temperature, so as to ensure that the temperature of the driving module 400 is not too high or too low.
The control method according to the embodiment of the present invention is also applicable to the outdoor unit of the single compressor 550.
Preferably, the first preset temperature is 2 ℃ to 5 ℃. That is, when the temperature difference between the temperature of the driving module 400 and the ambient temperature is smaller than the temperature value, it is determined that the condensation phenomenon may occur in the driving module 400, and at this time, the opening degree of the auxiliary electronic expansion valve 610 is adjusted in time, so that the temperature of the driving module 400 is adjusted, and the condensation phenomenon caused by further reduction of the temperature is avoided.
Preferably, the safe temperature interval is 50 ℃ to 75 ℃. That is, when the temperature of the driving module 400 is higher than 75 ℃, it is determined that the driving module 400 is too hot and may be burnt or damaged, and at this time, the opening degree of the auxiliary electronic expansion valve 610 is adjusted in time, so as to adjust the temperature of the driving module 400 and prevent the temperature of the driving module 400 from being continuously increased and burnt or damaged.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (17)
1. An outdoor unit for an air conditioner, comprising:
a plurality of compressors disposed inside the outdoor unit;
each compressor is correspondingly provided with a driving module, and the driving module is used for driving the corresponding compressor to operate;
the heat exchange blocks are connected to each driving module, and the two heat exchange blocks on the two adjacent driving modules are connected with each other;
the metal pipe is inserted into the heat exchange blocks, the metal pipe is used for circulating a refrigerant, and the heat exchange blocks are used for exchanging heat between the metal pipe and the driving module so as to reduce the temperature of the driving module.
2. The outdoor unit of claim 1, wherein adjacent two of the heat exchange blocks are connected by a heat transfer member for transferring heat between the adjacent two of the heat exchange blocks.
3. The outdoor unit of claim 2, wherein the heat conductive member and the heat exchange block are made of the same material and are integrally formed.
4. The outdoor unit of claim 3, wherein the heat exchange block comprises a fixing plate and a heat conduction part disposed on the fixing plate, a through hole is formed in the heat conduction part along a length direction of the fixing plate, the metal pipe is inserted into the through hole, the fixing plate is connected to the driving module, and the fixing plate and the heat conduction part are made of the same material and are integrally formed.
5. The outdoor unit of claim 4, wherein the heat conduction member has the same structure as the heat exchange block, and an end surface of the heat conduction member is closely coupled to an end surface of the heat exchange block.
6. The outdoor unit of claim 4, wherein the driving module is disposed on a circuit substrate, the fixing plate is closely attached to the circuit substrate, and the circuit substrate is capable of transferring cooling energy of the refrigerant to the driving module to reduce a temperature of the driving module.
7. The outdoor unit of claim 4, wherein the outer wall of the metal pipe is closely attached to the inner wall of the through hole by means of an expansion pipe.
8. The outdoor unit of claim 4, wherein the metal pipe is a U-shaped pipe, the heat exchange block includes two heat conduction parts and is disposed at both edges of the fixing plate along a length direction, and two straight pipe sections of the U-shaped pipe are inserted into the through holes of the two heat conduction parts, respectively.
9. A circulation system of an outdoor unit of an air conditioner according to any one of claims 1 to 8, comprising a supercooling heat exchanger, a main electronic expansion valve, an outdoor heat exchanger and a four-way valve which are disposed inside the outdoor unit and sequentially communicated with each other through a main circulation pipe, wherein the main circulation pipe is communicated with an indoor unit, the four-way valve is further connected with a compressor and a gas-liquid separator, the compressor is communicated with the gas-liquid separator, the gas-liquid separator is communicated with the supercooling heat exchanger, the main circulation pipe is provided with a cooling circulation branch, the cooling circulation branch is communicated with the metal pipe, and the cooling circulation branch is provided with an auxiliary electronic expansion valve.
10. The circulation system of claim 9, wherein the cooling cycle branch is disposed between the subcooling heat exchanger and the outdoor heat exchanger and in parallel with the main electronic expansion valve.
11. The circulation system of claim 9, wherein the cooling circulation branch is disposed at one end of the supercooling heat exchanger close to the indoor unit, and an outlet of the auxiliary electronic expansion valve is communicated with the supercooling heat exchanger.
12. A control method of the circulation system according to any one of claims 9 to 11, wherein a temperature sensor is provided in each of the drive modules, the temperature sensor being configured to detect a temperature of the drive module, the control method comprising:
monitoring the temperature of the driving module through the temperature sensor, setting a target temperature, wherein the target temperature is within a safe temperature range, and then adjusting an auxiliary electronic expansion valve to stabilize the temperature of the driving module at the target temperature;
when the temperature difference between the temperature of the driving module and the ambient temperature is smaller than a first preset temperature, the set temperature value of the target temperature is increased, the opening degree of the auxiliary electronic expansion valve is reduced, the amount of refrigerant circulating in the metal pipe is reduced, the temperature of the driving module with the temperature difference smaller than the first preset temperature is increased, and the temperature difference between the temperature of the driving module and the ambient temperature is larger than the first preset temperature.
13. The control method according to claim 12, wherein when it is detected that the temperature of the drive module is higher than the target temperature, the opening degree of the auxiliary electronic expansion valve is increased, the amount of refrigerant circulating in the metal pipe is increased, the temperature of the drive module whose temperature is higher than the target temperature is decreased, and the temperature of the drive module is stabilized at the target temperature.
14. The control method according to claim 13, wherein when only one of all the compressors needs to be operated, the driving module near the inlet of the cooling cycle branch is controlled to drive the corresponding compressor to operate.
15. The control method according to claim 13, wherein when a plurality of compressors are required to be operated in all of the compressors, a plurality of the driving modules near the inlet of the cooling cycle branch are controlled to drive a corresponding plurality of the compressors to be operated.
16. The control method according to claim 13, wherein the first preset temperature is 2 ℃ to 5 ℃.
17. The control method according to claim 13, characterized in that the safety temperature interval is 50-75 ℃.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970156.5A CN110762788A (en) | 2019-10-12 | 2019-10-12 | Air conditioner outdoor unit, circulating system and control method |
| EP19948665.5A EP4043809A4 (en) | 2019-10-12 | 2019-11-12 | Air conditioner outdoor unit and control method |
| PCT/CN2019/117285 WO2021068327A1 (en) | 2019-10-12 | 2019-11-12 | Air conditioner outdoor unit and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910970156.5A CN110762788A (en) | 2019-10-12 | 2019-10-12 | Air conditioner outdoor unit, circulating system and control method |
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